Final answer:
Using the thin-lens equation, the focal length of the lens is found to be -28.8 cm, indicating that the lens is a diverging lens. The magnification of the lens is -2.25, and because the initial height of the object is 8.00 mm, the image height is -18.0 mm, indicating that the image is inverted.
Explanation:
To find the focal length of the lens, we use the thin-lens equation:
1/f = 1/do + 1/di, where f is the focal length, do is the object distance, and di is the image distance. Given that do = -16.0 cm (negative because the object is to the left of the lens) and di = 36.0 cm (positive because the image is to the right of the lens), we can solve for f:
1/f = -1/16.0 cm + 1/36.0 cm
1/f = (-2.25 + 1)/36.0 cm
1/f = -1.25/36.0 cm
1/f = -0.0347 cm-1
Therefore, f = -28.8 cm.
The negative value of the focal length indicates that the lens is a diverging lens.
For Part C, the magnification (m) is given by the ratio of the image distance to the object distance: m = di/do = 36.0 cm / (-16.0 cm) = -2.25. Since the object height is 8.00 mm, the image height is magnified by 2.25 times, making the image height -18.0 mm (negative indicates an inverted image).
Finally, because the image height came out negative, we conclude the image is inverted.
Final answer:
The lens has a focal length of -28.8 cm, indicating it is a diverging lens. The image formed is erect and 18.00 mm tall, which is 2.25 times the height of the 8.00 mm object.
Explanation:
To find the focal length of the lens, we use the lens formula 1/f = 1/do + 1/di, where f is the focal length, do is the object distance, and di is the image distance. Given that do = -16.0 cm (negative because the object is on the same side as the light is coming from) and di = 36.0 cm (positive because the image is formed on the opposite side of the light source), we can calculate the focal length as follows:
1/f = -1/16.0 cm + 1/36.0 cm = -0.0625 cm-1 + 0.0278 cm-1 = -0.0347 cm-1
Thus, f = -1/0.0347 cm-1 ≈ -28.8 cm.
Since the focal length is negative, the lens is a diverging lens.
For part C, the magnification m can be found using the equation m = -di/do. Substituting the given distances, m = -36.0 cm / (-16.0 cm) = 2.25. So, the image is 2.25 times the height of the object. If the object is 8.00 mm tall, the image will be 8.00 mm * 2.25 = 18.00 mm tall.
Since the magnification is positive, the image is erect.
The electric-power industry is interested in finding a way to store electric energy during times of low demand for use during peak-demand times. One way of achieving this goal isto use large inductors.a)What inductance L would be needed to store energy E = 3.0 kWh (kilowatt-hours) in a coil carrying current I = 300A?
Answer:
240 H
Explanation:
The energy stored in an inductor is given by:
[tex]E=\frac{1}{2}LI^2[/tex]
where
L is the inductance of the inductor
I is the current
In this problem, we know:
[tex]I=300 A[/tex] is the current in the inductor
[tex]E=3.0 kWh = 3000 Wh[/tex] is the energy stored. We need to convert it into Joules:
[tex]E=3000 Wh=3000 Wh \cdot (3600 s/h)=1.08\cdot 10^7 J[/tex]
So, we can now solve the equation to find L, the inductance:
[tex]L=\frac{2E}{I^2}=\frac{2(1.08\cdot 10^7 J)}{(300 A)^2}=240 H[/tex]
The inductance needed to store 3.0 kWh of energy in a coil carrying a current of 300A is 240H.
Explanation:The energy stored in an inductor is given by the equation Eind = 1/2LI². To find the inductance need to store a specific amount of energy, we can rearrange this equation to solve for L (inductance): L = 2E/I². First, we must convert the energy from kilowatt-hours to a compatible SI unit which is joules: E = 3.0 kWh * 3600000 (conversion factor) = 10800,0000J. Substituting in the given values, L = (2 * 10800000) / (300²), it becomes L = 240H. Hence, the inductance needed to store 3.0 kWh of energy in a coil carrying a current of 300A is 240H.
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12. An electric motor is plugged into a standard wall socket and is run- ning at normal speed. Suddenly, some dirt prevents the shaft of the mo- tor from turning quite so rapidly. What happens to the back emf of the motor, and what happens to the current that the motor draws from the wall socket? (a) The back emf increases, and the current drawn from the socket decreases. (b) The back emf increases, and the current drawn from the socket increases. (c) The back emf decreases, and the current drawn from the socket decreases. (d) The back emf decreases, and the current drawn from the socket increases.
the answer would be B. the back emf increases, and the current drawn from the socket increases
more current is needed to make the motor move, like when you try to self crank a motor and the back wires are touching its harder to crank. and the emf increases since more current is being drawn in, strengthening the emf or increasing the emf
Which shows the correct reflected ray? Question options: A B C D
I think the answer is D because the law of reflection is the angle of incidence is equal to the angle of reflection.
Answer:
D
Explanation:
The law of reflection states that:
- The incident ray and the reflected ray lie on the same plane
- The angle of reflection is equal to the angle of incidence
The angle of incidence is the angle between the direction of the incident ray and the normal to the surface, while the angle of reflection is the angle between the direction of the reflected ray and the normal to the surface.
From the figure, we see that the only situation where the angle of reflection is equal to the angle of incidence is ray D.
The law of reflection states that the angle of reflection is equal to the angle of incidence, with these angles measured relative to a line perpendicular to the reflecting surface. Mirrors adhere precisely to this law, reflecting light at specific angles. Your choice, D, is correct if it shows the reflected light ray making the same angle with the normal as the incident light ray.
Explanation:You are correct in thinking that the answer is D. The law of reflection stipulates that the angle of incidence (the angle at which incoming light hits a surface) is equal to the angle of reflection (the angle at which light is reflected). These angles are always measured relative to a line perpendicular to the surface, called the normal. In your case, the correct answer would be an option where the reflected ray is at the same angle to the normal as the incident ray. If D shows that, then D is indeed the correct answer.
Mirrors, having smooth surfaces, adhere to this law of reflection perfectly, reflecting light at specific angles. Rough surfaces, on the other hand, diffuse light, causing it to scatter in many directions. This is why we can see clearly in mirrors but not on rough surfaces.
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Compared to a main-sequence star with a short lifetime, a main-sequence star with a long lifetime is __________.
The answer would be less luminous, cooler, smaller, and less massive.
A main-sequence star with a long lifetime is typically characterized by lower mass, cooler temperature and less luminosity, compared to a star with a short lifetime. They consume their nuclear fuel at a slower rate, allowing them to have a longer lifespan in the main-sequence phase, such as red dwarfs.
Explanation:Compared to a main-sequence star with a short lifetime, a main-sequence star with a long lifetime is typically less massive, cooler, and emits less light. The lifetime of a star is directly related to its mass. Stars with larger mass burn through their nuclear fuel at a quicker rate, leading to a shorter main-sequence lifetime. Conversely, stars with smaller mass, such as red dwarfs, consume their fuel more slowly and thus have longer main-sequence lifetimes.
For example, the Sun, a moderate mass star, is expected to remain in the main-sequence stage for about 10 billion (10¹0) years. This is much longer than a more massive star, like a blue giant, which might only last a few million years in the main sequence stage.
However, less massive stars, commonly known as red dwarfs, with masses less than half that of the Sun, can have main sequence lifetimes that stretch into the trillions of years, due to their efficient use of nuclear fuel.
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At what age is the human brain fully developed?
25 is the correct answer
The brain is fully developed at the age of 25
Kirchhoff's loop rule for circuit analysis is an expression of which of the following? Conservation of charge Conservation of energy Ampere's law Ohm's law Faraday's law
Final answer:
Kirchhoff's loop rule for circuit analysis expresses the conservation of energy, stating that the sum of all voltage gains and drops in a closed circuit loop must be zero. This rule, pivotal in analyzing complex electrical circuits, ensures that energy within the circuit is conserved, aligning with the principle that the total energy supplied equals the total energy used.
Explanation:
Kirchhoff's loop rule for circuit analysis is an expression of the conservation of energy. This rule, also known as Kirchhoff's second law or voltage law, asserts that the sum of all voltage drops and rises around any closed circuit loop must equal zero. It effectively ensures that energy is conserved within an electrical circuit, reflecting the principle that the total energy supplied in the circuit equals the total energy used.
Kirchhoff's rules, including both the loop rule and the junction rule (which reflects the conservation of charge), are fundamental in analyzing electrical circuits. They allow for the calculation of potential differences and currents within complex circuits, making them pivotal tools in circuit analysis. Kirchhoff's loop rule is a simplification of Faraday's law of induction and holds true under the assumption that there is no fluctuating magnetic field linking the closed loop.
This simplicity makes the loop rule a powerful tool for analyzing circuits in a wide variety of situations, regardless of the circuit's composition and structure. By applying these rules, currents in the circuit can be related through the junction rule, and a system of equations can be generated using the loop rule to solve for each current value, thus conserving energy throughout the circuit.
In order to protect underground pipelines and storage tanks made of iron, the iron is made the cathode of a voltaic cell through a process called ___________________.sacrificial anodizationcathodic protectionrustinggalvanization
The answer would be that the process to protect the underground pipelines and storage tanks is cathodic protection.
Pedro is planning to model how changes in weather affect evaporation from lakes. For his second experiment, he wants to test how winds affect the evaporation rate. He places one beaker with 300 mL of water in an area away from any fans, and he places another beaker with 300 mL of water near a small fan.
What is the dependent variable in Pedro's experiment?
A. Volume of water
B. Evaporation rate
C. Temperature
D. Movement of air
Which process causes Earth’s surface to warm?
answer :the radiation of the Sun’s electromagnetic waves
The radiation of the sun's electromagnetic waves
Explanation;The energy that drives the climate system comes from the Sun. When the Sun's energy reaches the Earth it is partially absorbed in different parts of the climate system. The absorbed energy is converted back to heat, which causes the Earth to warm up and makes it habitable.Energy from the sun heats Earth's surface, warms the atmosphere, provides energy for photosynthesis, causes evaporation, drives the weather and water cycles, and powers the ocean currents.Answer:
the radiation
Explanation:
an airplane takes off from Dallas Texas to fly to new york city traveling ne for 2,760 km the Same plane returns that day to Dallas the airplane spent 2 hours on the trip to new york city and the return trip took 2 1/2 hours what is the airplanes speed for the round trip
1,104
1,227
1,300
1104 km/hour
ExplanationDistance between Dallas Texas to New York = 2760 km
Time the plane took from Dallas to New York = 2 hours
Time the plane took from New York back to Dallas = 2.5 hours
Formula to use
distance = speed x timeSpeed the plane took from Dallas to New York
2760 = 2 x speed
speed = 2760 / 2
= 1380 km/hour
Speed the plane took from New York to Dallas (ROUND TRIP)
2760 = 2.5 x speed
speed = 2760 / 2.5
= 1104 km/hour
Answer: The speed of airplane is 1227 km/hr
Explanation:
Average speed is defined as the ratio of total distance traveled to the total time taken.
To calculate the average speed of the airplane, we use the equation:
[tex]\text{Average speed}=\frac{\text{Total distance traveled}}{\text{Total time taken}}[/tex]
We are given:
Total distance traveled = (2760 + 2760) km = 5520 km (Round trip)
Total time taken = (2 + 2.5) hr = 4.5 hr
Putting values in above equation, we get:
[tex]\text{Average speed of airplane}=\frac{5520km}{4.5hr}=1227km/hr[/tex]
Hence, the speed of airplane is 1227 km/hr
When a system is heated, heat is _______________ by the system. The amount of heat added is given a _______________ sign. When a system is cooled, heat is _______________ by the system. The amount of heat is given a _______________ sign. If a gas expands, it must push the surrounding atmosphere away. Thus, work is done _______________ the system and is given a _______________ sign. If a gas is compressed, then work is done _______________ the system. This work is given a _______________ sign.
First of all, we need to write the First Law of thermodynamics assigning the correct sign convention:
[tex]\Delta U = Q+W[/tex]
where
[tex]\Delta U[/tex] is the change in internal energy of the system
Q is the heat absorbed/released
W is the work done
and the signs are assigned based on whether there is an increase in the internal energy or not. Therefore:
Q is positive if it is absorbed by the system (because internal energy increases)
Q is negative if it is released by the system (because internal energy decreases)
W is negative if it is done by the system on the surrounding (because internal energy decreases)
W is positive if it is done by the surrounding on the system (because internal energy increases)
Using these definitions, we can now fill the text of the question:
When a system is heated, heat is ABSORBED by the system. The amount of heat added is given a POSITIVE sign. When a system is cooled, heat is RELEASED by the system. The amount of heat is given a NEGATIVE sign. If a gas expands, it must push the surrounding atmosphere away. Thus, work is done BY the system and is given a NEGATIVE sign. If a gas is compressed, then work is done ON the system. This work is given a POSITIVE sign.
Answer:
When a system is heated, heat is ABSORBED by the system. The amount of heat added is given a POSITIVE sign. When a system is cooled, heat is RELEASED by the system. The amount of heat is given a NEGATIVE sign. If a gas expands, it must push the surrounding atmosphere away. Thus, work is done BY the system and is given a NEGATIVE sign. If a gas is compressed, then work is done ON the system. This work is given a POSITIVE sign.
Explanation:
Using our understanding of orbits, which orbits (near or far) are moving more slowly?
near
far
The closer the planet is to the sun's gravitational pull, the planet will move faster because it takes less time to orbit the sun. The planets that are farther away have less gravitational pull, which means they will move slower and take more time to orbit the sun.
Using our understanding of orbits, objects in lower, near-in orbits move slower than objects in higher, far-out orbits.
Here's a set of examples:
International Space Station ...
Orbital height -- 254 miles
Speed in Orbit -- 76 mi/sec
Geostationary TV satellite ...
Orbital height -- 22,200 miles
Speed in orbit -- about 1.9 mi/sec
Moon ...
Orbital height -- 238,000 miles
Speed in orbit -- about 0.6 mi/sec
What is the speed of sound in air at 42.0 ºC?
= 356.2 m/s
Explanation;The speed of the wave is dependent on temperature of the medium;
The equation to use will be;
Speed = 331 + 0.6 T ; where T is the temperature in degrees Celsius.
T = 42 °C
Therefore;
speed = 331 + 0.6 × 42
= 356.2 m/s
Color depends on what characteristic of light?
Answer:
On the wavelength
Explanation:
Visible light is just a small portion of the electromagnetic spectrum, which classifies all the electromagnetic waves from shortest wavelength (gamma rays) to longest wavelength (radio waves).
Visible light refers to the part of the spectrum which has wavelength between 380 nm and 750 nm. These are the only electromagnetic wave that our eyes can see, and depending on their wavelength, they appear as a different color. In particular, each color corresponds to a different range of wavelengths:
Violet: 380-450 nm
Blue: 450-495 nm
Green: 495-570 nm
Yellow: 570-590 nm
Orange: 590-620 nm
Red: 620-750 nm
Color perception relies on the wavelength of light, as each wavelength corresponds to a particular color. A white object reflects all visible wavelengths, while a black object absorbs them all. The perceived color of an object depends on which wavelengths its atoms absorb and reflect.
Explanation:The color of an object or light depends greatly on the characteristic of light known as wavelength. Wavelength defines the energy of a photon in the visual spectrum, and each wavelength corresponds to a specific color.
Let's take a white object as an example: when it is illuminated by white light, which comprises all visible wavelengths, it appears white as well. This is because it reflects all visible wavelengths equally. On the contrary, a black object absorbs all light and doesn't reflect any, which is why it appears black to our eyes.
Also characteristic is how the atoms of a material interact with different light wavelengths. For instance, a simple red object like a tomato absorbs all wavelengths except red - the energy levels in its atoms correspond to all visible photons except red, which is reflected back to our eyes leading to its color perception.
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The earth's crust is _____. thicker under the oceans than under the continents in motion because of convection currents in the mantle mostly made of iron and nickel made of one large piece called the crustal plate
In motion because of convection currents in the mantle.
The food we eat has ______________ potential energy because as our body digests it, it provides us with energy for basic metabolism.
A. gravitational
b. magnetic
c. chemical
Hi, the answer is C. (chemical potential energy)
Who first proposed the existence of antimatter
The modern theory of antimatter began in 1928, with a paper by Paul Dirac.
A switch that connects a battery to a 10 µF capacitor is closed.Several seconds later you find that the capacitor plates are charged to 30 µC.What is the emf of the battery?
Answer:
3 V
Explanation:
The relationship between capacity (C), charge stored (Q) and potential difference across a capacitor (V) is
[tex]C=\frac{Q}{V}[/tex] (1)
The problem asks us to find the emf of the battery several seconds after the switch has been closed: this means that the capacitor had enough time to fully charge, so the potential difference across the capacitor (V) is equal to the emf of the battery.
Since we have:
[tex]C=10 \mu F=10\cdot 10^{-6} F[/tex]
[tex]Q=30 \mu C=30\cdot 10^{-6} C[/tex]
We can solve the equation for V, and we find
[tex]V=\frac{Q}{C}=\frac{30 \cdot 10^{-6}C}{10 \cdot 10^{-6} F}=3 V[/tex]
A switch that connects a battery to a 10 µF capacitor is closed for several seconds and the capacitor plates are charged to 30 µC then the voltage across the capacitor will be 3 V.
The emf of the battery will be equal to the voltage across the capacitor which is 3 V.
How do you calculate the emf of the battery?
The EMF or electromotive force can be defined as the energy supplied by a battery or a cell per coulomb (Q) of charge passing through it. The magnitude of emf is equal to V (potential difference) across the cell terminals when there is no current flowing through the circuit.
Hence the emf of the battery will be equal to the voltage across the capacitor.
The voltage across a capacitor can be calculated as given below.
[tex]V = \dfrac {Q}{C}[/tex]
Where Q is the amount of charge stored on each plate and C is the capacitance.
[tex]V = \dfrac { 30 }{10}[/tex]
[tex]V = 3\;\rm V[/tex]
Hence we can conclude that the emf of the battery is 3 V.
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How do we know galaxies are moving away from us
Answer:
Because their light is red-shifted
Explanation:
Doppler effect is a phenomenon that occurs when the source of a wave is moving relative to an observed. In particular, two situations are possible:
- The wave source is moving towards the observer --> in this case, the frequency of the waves appear to be higher than the original one; as a consequence, the wavelength of the waves appears to be shorter
- The wave source is moving away from the observer --> in this case, the frequency of the waves appear to be lower than the original one; as a consequence, the wavelength of the waves appears to be longer
This phenomenon occurs also for light waves. In particular, the light coming from distance galaxies undergoes Doppler effect as well, since those galaxies are moving relative to us. We have again two possible situations:
- The galaxy is moving towards the Earth --> in this case, the frequency of the light appear to be higher than the original one; as a consequence, the wavelength of the light emitted appears shorter (so, it shifts towards the blue color --> this is known as blue-shift)
- The galaxy is moving away from the Earth --> in this case, the frequency of the light emitted appears to be lower than the original one; as a consequence, the wavelength of the light appears to be longer (so, it shifts towards the red color --> this is known as red-shift)
Since the Universe is expanding, almost all galaxies are moving away from us: therefore, we notice a red-shift for the light coming from nearly all of them, and this is how we know they are moving away from us.
Physics question, please help?
A cue ball with mass 170 g hits the stationary number 8 ball, which has mass 160 g. The cue ball and the 8 ball move with a speed of 0.2 m/s and 0.3 m/s respectively after the collision. What was the speed of the cue ball before the collision?
A) 0.2502 m/s
B) 0.4823 m/s
C) 0.5008 m/s
D) 0.5319 m/s
0.4823 m/s
The initial velocity u1 of the ball=0
From the law of conservation of linear momentum.
m1u1+m2u2=m1v1+m2v2
(160×0)+(170×u1)=(160×0.3)+(170×0.2)
u1=0.4823m/s
The speed of the cue ball before the collision is approximately 0.5319 m/s.
Explanation:Before the collision, we can use conservation of momentum to find the speed of the cue ball. In an isolated system, the total momentum before the collision is equal to the total momentum after the collision.
Let's denote the initial velocity of the cue ball as v1 and the initial velocity of the 8 ball as v2. The momentum before the collision is given by:
(mass of cue ball) x (velocity of cue ball) + (mass of 8 ball) x (velocity of 8 ball)
The total momentum after the collision is:
(mass of cue ball + mass of 8 ball) x (velocity of cue ball + velocity of 8 ball)
Using the given values, we know that the cue ball and 8 ball move with speeds of 0.2 m/s and 0.3 m/s, respectively, after the collision. Plugging these values into the equations, we can solve for v1 to find the speed of the cue ball before the collision.
The speed of the cue ball before the collision is approximately 0.5319 m/s.
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A 2.0-m-tall man is 5.0 m from the converging lens of a camera. His image appears on a detector that is 50 mm behind the lens. How tall is his image on the detector?
Answer:
20 cm
Explanation:
We can solve the problem by using the magnification equation:
[tex]M=\frac{h_i}{h_o}=-\frac{q}{p}[/tex]
where
[tex]h_i[/tex] is the size of the image
[tex]h_o = 2.0 m[/tex] is the height of the real object (the man)
[tex]q=50 mm =0.050 m[/tex] is the distance of the image from the lens
[tex]p = 5.0 m[/tex] is the distance of the object (the man) from the lens
Solving the formula for [tex]h_i[/tex], we find
[tex]h_i = -\frac{q}{p}h_o=-\frac{0.050 m}{5.0 m}(2.0 m)=-0.02 m = -20 cm[/tex]
And the negative sign means the image is inverted.
The height of the image on the detector is 100 mm.
Explanation:To determine the height of the image on the detector, we can use the lens equation:
1/f = 1/di - 1/do
Where f is the focal length of the lens, di is the image distance, and do is the object distance.
In this case, the focal length of the lens is 50 mm, the object distance is 5.0 m, and the image distance is 50 mm (since the detector is located 50 mm behind the lens).
Substituting these values into the equation, we can solve for di:
1/50 = 1/di - 1/5000
Simplifying, we get:
di = 100 mm
This means that the height of the image on the detector is 100 mm, since the image distance is equal to the height of the image.
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Please help me with this Physics question?
A 12.0 kg Steel block is resting on a horizontal table. The coefficient of static friction is 0.70. Find the minimum force needed to start the block moving.
A) 35.3 N
B) 80.4 N
C) 82.4 N
D) 86.4 N
C 82.4 N sorry man if i am wrong but don't even think about reporting my answer
Final answer:
The minimum force needed to start a 12.0 kg steel block moving, with a coefficient of static friction of 0.70, is slightly greater than 82.32 N. The closest given option is 82.4 N (Option C).
Explanation:
To find the minimum force needed to start the 12.0 kg Steel block moving on a surface with a coefficient of static friction of 0.70, we need to calculate the force of friction that must be overcome. This force of friction is given by Fs = μs * N, where Fs is the static friction force, μs is the coefficient of static friction, and N is the normal force. The normal force is equal to the weight of the block, which is the mass of the block times the acceleration due to gravity (9.8 m/s²).
First, calculate the normal force:
N = mass * gravity = 12.0 kg * 9.8 m/s² = 117.6 N
Next, calculate the force of static friction:
Fs = μs * N = 0.70 * 117.6 N = 82.32 N
Therefore, the minimum force needed to start the block moving is slightly greater than 82.32 N. Out of the given options, the closest value is 82.4 N (Option C).
A dentist causes the bit of a high-speed drill to accelerate from an angular speed of 1.50 × 10 4 1.50×104 rad/s to an angular speed of 3.35 × 10 4 3.35×104 rad/s. In the process, the bit turns through 2.02 × 10 4 2.02×104 rad. Assuming a constant angular acceleration, how long would it take the bit to reach its maximum speed of 6.90 × 10 4 6.90×104 rad/s, starting from rest?
Answer:
0.32 s
Explanation:
Initial angular speed: [tex]\omega_i = 1.50 \cdot 10^4 rad/s[/tex]
Final angular speed: [tex]\omega_f = 3.35\cdot 10^4 rad/s[/tex]
Angular rotation: [tex]\theta=2.02\cdot 10^4 rad[/tex]
The angular acceleration of the drill can be found by using the equation:
[tex]\omega_f^2 - \omega_i^2 = 2 \alpha \theta[/tex]
Re-arranging it, we find [tex]\alpha[/tex], the angular acceleration:
[tex]\alpha = \frac{\omega_f^2 - \omega_i^2}{2\theta}=\frac{(3.35\cdot 10^4 rad/s)^2-(1.50\cdot 10^4 rad/s)^2}{2(2.02\cdot 10^4 rad)}=22,209 rad/s^2[/tex]
Now we want to know the time t the drill takes to accelerate from
[tex]\omega_i =0[/tex]
to
[tex]\omega_f = 6.90\cdot 10^4 rad/s[/tex]
This can be found by using the equation
[tex]\omega_f = \omega_i + \alpha t[/tex]
where [tex]\alpha[/tex] is the angular acceleration we found previously. Solving for t,
[tex]t=\frac{\omega_f - \omega_i}{\alpha}=\frac{22,209 rad/s^2}{6.90\cdot 10^4 rad/s}=0.32 s[/tex]
If a car is moving to the left with constantvelocity, one can conclude thatthere mustbe no forces applied to the car.the netforce applied to the car is directed to the left.the netforce applied to the car is zero.there isexactly one force applied to the car.
Answer:
the net force applied to the car is zero.
Explanation:
According to Newton's second law, the acceleration of an object (a) is directly proportional to the net force applied (F):
[tex]a=\frac{F}{m}[/tex]
where m is the object's mass.
In this problem, the car is moving with constant velocity: this means that the acceleration is zero, a = 0. Therefore, according to the previous equation, the net force must also be zero: F = 0. So, the correct answer is
the net force applied to the car is zero.
About what is Rigel's surface temperature?
Answer:
it is bigger than, a higher temperature , and 11,000
Explanation:
Rigel is a star with a surface temperature of about 12,100 Kelvin, yielding a blue-white color due to its high surface temperature.
Explanation:The surface temperature of Rigel, a supergiant star, is approximately 12,100 Kelvin. This temperature contributes to Rigel's blue-white color, as higher surface temperatures in stars result in shorter wavelength light, which falls towards the blue end of the color spectrum.
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when a physical change occurs what can not be affected as well?
A) size
B) shape
C) density
D) composition
A) Size
hope this helps
A( size like what the other person said
During spring semester at MIT, residents of the parallel buildings of the East Campus dorms battle one another with large catapults that are made with surgical hose mounted on a window frame. A balloon filled with dyed water is placed in a pouch attached to the hose, which is then stretched through the width of the room. Assume that the stretching of the hose obeys Hooke's law with a spring constant of 92.0 N/m. If the hose is stretched by 3.20 m and then released, how much work does the force from the hose do on the balloon in the pouch by the time the hose reaches its relaxed length?
Answer:
294.4 N
Explanation:
Since the hose obeys Hooke's law, the force it exerts on the balloon in the pouch is given by:
[tex]F=kx[/tex]
where
k is the spring constant
x is the stretching
In this problem,
k = 92.0 N/m
x = 3.20 m
Therefore, the force exerted is
[tex]F=(92.0 N/m)(3.20 m)=294.4 N[/tex]
What are beats? A. periodic fluctuations in the velocity of sound waves B. periodic fluctuations in the wavelength of sound waves C. periodic fluctuations in the intensity of sound waves D. periodic fluctuations in the frequency of sound waves
The answer is
C. periodic fluctuations in the intensity if sound waves.
Answer:
D. periodic fluctuations in the frequency of sound waves
Explanation:
Beat is referred to the phenomena that occurs when to sound waves interfer with each other and they have different frequencies.
This difference is what creates a beating, wich in sound waves manifest as high and low sounds, this as a result of the oscilating frequency .
Which best describes what happens when light traveling through air enters water at an angle? It moves along straight lines in air and changes direction when it enters water. It moves in a curve in air and moves in straight lines when it enters water. It moves along straight lines in air and continues along the same lines when it enters water. It moves in a curve in air and continues moving in the same curve when it enters water.
Answer:
It moves along straight lines in air and changes direction when it enters water.
Explanation:
When light travels from one medium to another, it undergoes a phenomenon called refraction: the ray of light changes speed and also direction, but it continues to move in a straight line.
There is a relationship between the direction of the incident ray and the direction of the refracted ray: (Snell's Law)
[tex]n_1 sin \theta_1 = n_2 sin \theta_2[/tex]
where
n1 is the index of refraction of the first medium
[tex]\theta_1[/tex] is the angle that the incident ray forms with the normal to the surface
n2 is the index of refraction of the second medium
[tex]\theta_2[/tex] is the angle that the refracted ray forms with the normal to the surface
Answer:
A: It moves along straight lines in air and changes direction when it enters water.
Explanation:
What medium do seismic waves travel through?
Answer:
They travel along the surface of the Earth and through the earth.