Answer:
Kilowatt per hour
Explanation:
The energy is equal to the power by time.
[tex]E=\frac{P}{t}[/tex]
Compare and contrast power and work.
Answer:
Comparison
Displacement and force are factors of both work and power
Work=Force× Displacement
power=(Force×Displacement)/time
Therefore power is the derivative of work with respect to time.
Contrast
Work is defined as a product of force and distance while power is the rate at which the work is done.
What state of matter has the most energy
Answer:
gas particles have the greatest amount of energy
What would be Kelly's weight be in Newton's if her mass is 70 kilograms?
It would be the first option, A
because u use the equation: W = m*g
Answer:
A. 70xg (where g refers to gravitational acceleration)
Explanation:
Data:
mass = 70 kg
gravitational acceleration = 9.81 m/(s^2)
Weight is computed as follows:
Weight = mass * gravitational acceleration
Replacing with data:
Weight = 70 kg * 9.81 m/(s^2)
Weight = 686.7 N
PLEASE HELP APEX
in an isolated system, two cars, each with a mass of 1,100 kg, collide. car 1 is initially at rest, while car 2 was moving at 10m/s. what is the magnitude of their combined momentum after the collision?
Answer:
A
Explanation:
Momentum before = momentum after
(1,000 kg) (0 m/s) + (1,000 kg) (10 m/s) = p
10,000 kg m/s = p
Answer is A.
Answer: The answer is A.
Okey, here we need to use the conservation of momentum!
(in the text and the image the masses are different, i will use the one of the image)
the total momentum before the collision is:
P = momentum of car 1 + momentum of car 2 = 0m/s*1000 kg + 10 m/s*1000 kg.
so the initial momentum is 10000 kg*m/s.
Because the system is isolated, and we will think that there is no loss of energy because of friction or anything like that, the momentum will conservative after the collision ( in a real situation the cars will absorb some of the energy in the collision).
So using the conservation of momentum, the momentum after the collision must be the same as before, so the answer is A = 10000 kg*m/s.
I will mark brainiest!
If your body is wet what is the lowest electrical voltage can be fatal?
A. 100 volts
B. 15 volts
C. 5 volts
D. 10 volts
Applied to the right place in the right way, a 5-volt source can kill a person.
When the human body is wet, its resistance decreases significantly, making it possible for a voltage as low as 10 volts to be fatal. This occurs because the low resistance allows enough current to interfere with heart rhythms. Therefore, the correct answer is 10 volts.
When the human body is wet, its resistance can significantly decrease to approximately 100 ohms. According to Ohm's law, the amount of current (I) that flows through a person depends on the voltage (V) and the resistance (R). For a fatal current, even a small voltage can become dangerous. Generally, it is considered that as little as 10 volts can be fatal as it may drive a current that interferes with heart rhythms. Therefore, the correct answer is 10 volts.
The average radius of Mars is 3,397 km. If Mars completes one rotation in 24.6 hours, what is the tangential speed of objects on the planet’s surface? Round your answer to the nearest whole number.
Answer:
Tangential speed of objects on the planet’s surface = 241 m/s
Explanation:
Speed is given by the ratio of distance traveled to the time.
Radius of mars, r = 3397 km = 3.397 x 10⁶ m
Distance traveled = 2πr = 2 x π x 3.397 x 10⁶ = 2.13 x 10⁷ m
Time taken = 24.6 hours = 24.6 x 60 x 60 = 88560 s
[tex]\texttt{Tangential speed =}\frac{2.13\times 10^7}{88560}=240.51m/s[/tex]
Tangential speed of objects on the planet’s surface = 240.51 m/s = 241 m/s
The tangential speed of objects on Mars' surface is approximately 242 m/s, calculated using the planet's circumference and rotation time.
To calculate the tangential speed of objects on Mars' surface, we first find the circumference of Mars using the formula:
Circumference=2π×radius=2π×3,397km≈21,371km.
Next, convert the time taken for one rotation from hours to seconds:
24.6hours×60minutes/hour×60seconds/minute≈88,560seconds.
Now, calculate the tangential speed using the formula:
Tangential Speed= Circumference / Time taken for one rotation
Tangential Speed≈ 21,371km / 88,560seconds ≈0.2417km/s≈241.7m/s.
Rounding to the nearest whole number, the approximate tangential speed of objects on Mars' surface is ≈242m/s.
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HELP PLEASE!!! 30+ points!!
a book is 9.26 cm tall and placed 22.7 cm to the left of a plane mirror. What is the height of the image formed by the mirror?
4.63
18.5
2.45
9.26
a book is 9.26 cm tall and placed 22.7 cm to the left of a plane mirror. What is the magnitude of the image distance?
22.7
9.26
24.5
11.4
You move away from a plane mirror at a speed of 1.60 m/s. At what speed does your image move away from you?
1.60 m/s
3.20m/s
6.40m/s
0.40m/s
1) 9.26 cm
Explanation:
The focal length of a plane mirror is virtually infinite. Considering the lens equation,
[tex]\frac{1}{f}=\frac{1}{p}+\frac{1}{q}[/tex]
where f is the focal length, p is the object distance, q the image distance. If we replace f with infinity, we get
[tex]q=-p[/tex]
The magnification equation states that
[tex]y' = -\frac{q}{p}y[/tex]
where y is the size of the object and y' the size of the image. Substituting q=-p, we get
[tex]y'=y[/tex]
this means that the image produced by a plane mirror is always:
- Upright (y' is positive)
- The same size as the object
In this case, we have a book of height 9.26 cm (y=9.26 cm). This means that the magnitude of the size of the image (y') will be 9.26 cm as well.
2) 22.7 cm
As we said before, due to the infinite focal length of a plane mirror,
[tex]q=-p[/tex]
this means that the image produced by a plane mirror is always:
- Virtual (because q is negative)
- At the same distance from the mirror as the object
In this case, we have a book placed at 22.7 cm from the mirror (p=22.7 cm). This means that the magnitude of the distance of the image from the mirror (q) will be 22.7 cm as well.
3) 1.60 m/s
We said previously that the image produced by a plane mirror is always at the same distance from the mirror as the real object. This implies that whenever we move the object toward/away from the mirror, the distance p will alway remain equal to the distance q. But this also means that the object and the distance are moving toward/away from the mirror at the same speed.
Therefore, since in this case the person is moving away from the mirror at 1.60 m/s, the image will also move away at a speed of 1.60 m/s.
How much force was applied to an object if was moved 2 meters and the work done on the object was 8 joules?
A.) 0.25 N
B.) 4 N
C.) 6 N
D.) 16 N
Answer:
The answer is 4N or B
Explanation:
Just the equation W = F x D.
We have W = 8 J and D = 2 m using algebra ....
8J/2m = F ... F = 4.
Answer:
B 4N
Explanation:
all the planets in the solar system have ____ except for mercury and venus?
Answer:
have moon except merc and Venus
A substance has a specific heat of point 870JGC it requires 2000.0 J to increase the temperature of the 10 g of the substance from its original temperature to it's final temperature by how many degrees did the substance increase
Answer:
[tex]229.9^{\circ} C[/tex]
Explanation:
The increase in temperature of a substance is given by
[tex]\Delta T = \frac{Q}{m C_s}[/tex]
where
Q is the amount of heat absorbed by the substance
m is the mass of the substance
Cs is the specific heat capacity
In this problem,
Q = 2000.0 J
m = 10 g
Cs = 0.870 J/gC
Substituting, we find the increase in temperature:
[tex]\Delta T = \frac{2000.0 J}{(10 g)(0.870 g/JC)}=229.9^{\circ} C[/tex]
Which are examples of a medium? water and air amplitude and wavelength crests and troughs compressions and rarefactions
Answer:
water and air
Explanation:
A wave is a transmission of a disturbance from one point or the source to another point.Transmission of a wave occurs through a material medium or a vacuum. Therefore a medium is the material through which a wave travels through. The medium may be in gaseous form, slid form or liquid form. Therefore water and air are example of medium of transmission of a wave.Air and water offer passage to waves so each can serve as a medium. A medium is the material through which waves pass.
What is a medium?The term medium refers to a pathway through which waves can pass. It refers to any thing that can offer a passage to waves.
Having known what a medium is, we now ask ourselves, what are the tings among the options that can serve as a medium? Clearly air and water offer passage to waves so each can serve as a medium.
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What is the initial upward velocity of a projectile fired at an angle of 40 m/s at an angle of 20o? A) 2 m/s B) 13.68 m/s C) 14.55 m/s D) 38 m/s
Find the upward velocityt by multiplying the speed by the cos of the angle.
= 40 x cos(20) = 37.588 m/s
Round to 38 m/s
The answer is D.
Answer: I choose A
Explanation:
Electromagnets are created by
Answer:
I think they are created by running electric currents through a coiled conductive wire.
Explanation:
Hope my answer has helped you!
How is the Sun similar to the stars that can be seen at night?
A) The Sun makes light energy.
B) The Sun takes light energy from space.
C) The Sun warms the Earth with its light.
D) The Sun reflects light from the planets.
Answer:
A
Explanation:
Answer:
A
Explanation:
cuz it is
Directions: WRITE a summary of the Newton’s Laws of Motion reading.
Your summary must correctly use the following academic language:
-Motion.
- inertia .
-acceleration interaction.
Answer:
In Newton's 1st Law, a stationary body or that moving with a uniform motion, will only change its state if acted upon by other external forces.This restance to change in position/motion is called inertia. In his second law, when a body is acted upon by a force, the force will be equal to the product of mass and acceleration of the body.i.e. Force= m.a. In the third law, it explains that a body will exert an equal and opposite force when intracting with another body.Here, every action force experiences an equal and opposite reaction force, where the momentum of the bodies will be conserved.
Which describes an object in projectile motion? Check all that apply.
Gravity acts to pull the object down.
The object moves in a straight path.
The forward velocity of the object is 0 m/s.
The object’s inertia carries it forward.
The path of the object is curved.
Please and Thank You!
Answer:
Gravity acts to pull the object down.
The object’s inertia carries it forward.
The path of the object is curved.
Explanation:
The motion of a projectile consists of two separate motions:
- A uniform motion along the horizontal direction, where the velocity is constant; since there are no forces along this direction, the velocity does not change, and so the object continues its motion for inertia --> so, the statement "The object’s inertia carries it forward" is true.
- A uniformly accelerated motion along the vertical direction, with a constant downward acceleration (g=9.8 m/s^2, acceleration due to gravity). So, the vertical velocity changes, due to the presence of the gravity that acts to pull the object down.
- As a result of the combination of these two motions, the object follows a curved path (in particular, it is a parabolic path).
Imagine you are digging a hole to the center of the earth. In which order would dig through them?
A. inner core, outer core, upper mantle, lower mantle, crust
B. crust, upper mantle, lower mantle, outer core, inner core
C. crust, outer core, inner core, upper mantle, lower mantle
D. inner core, outer core, lower mantle, upper mantle, crust
Answer:
Crust, Upper Mantle, Lower Mantle, Outer Core, Inner Core
Explanation:
An object is in circular motion how will the object behave if the centipetal force is removed
Answer:
Explanation:
When a body is in circular motion, the centripetal force acts towards the center of the curvature of the path. It is required to keep the object in circular motion. The velocity acts in the tangential direction to the curvature and when the centripetal force is removed it threads that path
Final answer:
When the centripetal force is removed from an object in circular motion, the object will move in a straight line tangent to the circular path it was previously following.
Explanation:
When the centripetal force is removed from an object in circular motion, the object will continue to move in a straight line tangential to the circular path it was originally following.
This is because an object in circular motion requires a centripetal force, directed towards the center of the circle, to keep it moving in a curved path. The centripetal force acts as the inward force that constantly changes the object's direction to keep it in the circular path.
If the centripetal force is suddenly removed, there is no longer a force acting towards the center of the circle, and the object will continue with its original velocity, moving in a straight line tangent to the circle.
Please help!!!! discussion Topic
An enormous amount of electricity is created at
power-generating stations and sent across the
country through wires that carry high voltages.
Appliances, power lines, airport and military
radars, substations, transformers, computers, and
other equipment that carries or uses electricity all
generate electromagnetic fields.
Many questions have been raised about how
electromagnetic fields affect our bodies. Do they
pose a public health risk? Perform an Internet
search to find information about the effects of
electromagnetic fields on public health. Then,
discuss the pros and cons of using equipment that
produces an electromagnetic field.
Answer:
Scientists studies have found that the terrestrial electromagnetic environment is actually affecting our health. It is hard to avoid these fields because there are so many things in our life that generate electro magnetic fields. Some of the bioeffects inculde changes in melatonin levels, effects on spatial memory, alteration of intracellular calcium concentration, changes in blood-brain-barrier permeability, enzyme activity, genotoxicity, nonspecific disabilities, and subjective symptoms. Scientists have also found that radiation exposure from mobile phones has been linked with tinnitus, brain tumours, and acoustic neuroma.
The electromagnetic fields have many pros and cons and the human being. Yes, they pose a public health risk.
What is magnetic field?The magnetic field is the region of space where a charged object experiences magnetic force when it is moving.
When current flows through the circuit, the coil gets magnetized. In an electrical circuit , the magnetic field of a straight wire has less magnetic field strength than that of coiled wire.
An enormous amount of electricity is created at power-generating stations and sent across the country through wires that carry high voltages. Appliances, power lines, airport and military radars, substations, transformers, computers, and other equipment that carries or uses electricity all generate electromagnetic fields.
Scientist have discovered that the earthly electromagnetic climate is really influencing our wellbeing. It is difficult to keep away from these fields since there are such countless things in our day to day existence that create electromagnetic fields.
A portion of the bioeffects include changes in melatonin levels, consequences for spatial memory, modification of intracellular calcium fixation, changes in blood-mind hindrance penetrability, chemical movement, genotoxicity, vague handicaps, and emotional side effects. Researchers have additionally found that radiation openness from cell phones has been connected with tinnitus, cerebrum cancers, and acoustic neuroma.
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What parts are found in an electric generator? Check all that apply
An electric generator primarily consists of wire loops which rotate within a magnetic field, generating an AC voltage that drives an AC current. The mechanical energy to rotate the wire loops can be derived from various sources like hydropower, fossil fuels, or wind energy. Another important component is the commutator or slip rings.
Explanation:The essential parts of an electric generator are the wire loops and a magnetic field. An external source provides mechanical energy that drives the wire loops to rotate within the magnetic field. This mechanical action generates an alternating current (AC) voltage which in turn drives an AC current through the wire loops.
The source of this mechanical energy can be various, such as falling water (used in hydroelectric power), steam produced by the burning of fossil fuels (used in coal or natural gas power plants), or the kinetic energy of the wind (used in wind turbines). Another key part of the electric generator is the commutator or slip rings, which help in transferring the produced electric current from the rotating part of the generator to the stationary part.
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Which of the following is not a simple machine?
A. A Wheel and axle
B. A lever
C. A pair of scissors
D. A screw
Answer:
C
Explanation:
A wheel and axle, a lever, and a screw are all simple machines.
A pair of scissors is not a simple machine.
Answer is C.
C. scissors are a TYPE of. it is not a simple machine
Calculate the work done to stretch an elastic string by 40cm if a force of 10N produces an extension of 4cm in it?
Answer:
40 J
Explanation:
Work = change in energy
W = 1/2 k (Δx)²
First we need to find the value of k.
F = kΔx
10 N = k (0.04 m)
k = 250 N/m
Solving for work
W = (250 N/m) (0.40 m)²
W = 40 J
A stone is projected from the ground with a velocity 14m/s one second later it clears a wall 2 m high. The angle of projection is?
A stone is projected from the ground with a velocity 14 m/sec one second later it clears 2 meter walls then angle of projection is 30 degree.
14sinθ×1−5×12=25
14sin=30
sin=30/14
sinθ>2 not possible
vsinθt−1/2×gt^2=2
14×sinθ−5=2
14xsinθ=7
Sinθ=7/14
Sinθ=1/2
θ=30 degree
What is projectile motion?
Projectile motion is a type of motion in which a object is thrown from the surface earth at some angle it will take projectile projection .
In above question a man thrown a object 14 m/sec an it will moves 2 meter.
Then
vsinθ×t−1/2×gt^2=25
where v = intial velocity in m/sec
t = time in sec
g = acceleration due to gravity
14sinθ×1−5×12=25
14sin=30
sin=30/14
sinθ>2 not possible
vsinθt−1/2×gt^2=2
14×sinθ−5=2
14xsinθ=7
Sinθ=7/14
Sinθ=1/2
θ=30 degree
Therefore, A stone is projected from the ground with a velocity 14 m/sec one second later it clears 2 meter walls then angle of projection is 30 degree.
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2. Explain the mechanism by which AC (alternating current) through the primary circuit of a transformer produces an alternating voltage and current in the secondary coil. Then explain why this would or would not work with DC (nonalternating current) in the primary coil.
Explanation:
A transformer consists of core of soft iron (a material that can be easily magnetized/demagnetized), to which two coils are attached at both ends.
An alternating current in the primary coil produces a magnetic field around the coil, magnetizing the iron core; therefore, the same magnetic field produces a magnetic flux in the secondary coil.
Since the AC current in the primary coil is variable, then the magnetic field also changes, so the magnetic flux through the secondary coil changes over time; therefore, an electromotive force (and so, a current) is induced in the secondary coil, according to Faraday-Newmann-Lenz:
[tex]\epsilon= - \frac{d\Phi}{dt}[/tex]
where
[tex]\epsilon[/tex] is the induced emf
[tex]\frac{d\Phi}{dt}[/tex] is the rate of change of magnetic flux through the secondary coil
We notice that this mechanism would not work if the current in the primary coil is a DC current: in fact, a DC current has always a constant value, so there is no change in the magnetic field, therefore no change in the magnetic flux through the secondary coil and no emf induced.
A person walks 2 miles every day to work, leaving her front porch at 7:00 A.M. and arriving at work at 7:30 A.M. ON the way home she walks the same route and ends at her front porch. What is her displacement?
Answer:
The displacement is zero miles
Explanation:
The displacement of an object that moves from point A to point B is defined as
[tex]d =B-A[/tex]
Where d is the displacement of the object. The displacement does not depend on the trajectory of the object. It only depends on the linear distance between the end point and the starting point.
In this case we know that the person walks from home to work and then walks from work to home. Therefore, the total displacement is the linear distance between the point where its journey begins and the point where the route ends.
The tour begins on the front porch of your house and ends on the front porch of your house (when you return from work). If we call A to the front porch of the house then the displacement is:
[tex]d = A-A = 0[/tex]
The displacement is zero miles, since the person finishes the journey just where it started (front porch)
The main characteristic of all vertebrates is the presence of
a. cartilage
b. a large brain
c. a backbone
d. an exoskeleton
I got it. The answer was B
Answer:
c
Explanation:
backbone is the correct answer
Which best describes accuracy?
A.) the smallness of the graduations on a measuring tool
B.) the reproducibility of a measured value
C.) the dependence of a measured value on a controlled value
D.) the agreement between a measured value and an accepted value
Answer: A.) the smallness of the graduations on a measuring tool
Explanation:
Accuracy is defined as the closeness of the measured value to the actual value. Therefore, out of the options, this is best described by A. the smallness of the graduations on a measuring tool. This is because smaller graduations mean that the value can be measured to a smaller level, making it more accurate. PLEASE GIVE ME BRAINIEST
How many chlorine atoms are needed on the left in order to balance this chemical equation?
__ Ag __ Cl → __ AgCl2
Answer:
2
Explanation:
There are 2 chlorine atoms in AgCl₂. So to balance the equation, there needs to be 2 atoms on the left side as well.
Final answer:
The question likely contains a typo, as AgCl2 is not a standard chemical compound. Assuming a standard compound AgCl, the balanced equation would require two silver atoms and one chlorine molecule to produce two units of AgCl.
Explanation:
The chemical equation provided in the question seems to have a typo since AgCl2 is not a common chemical compound, as silver typically forms AgCl. Assuming the intention was to balance a reaction forming AgCl, the balanced equation would look like this:
[tex]2 Ag (s) + Cl_2 (g) - > 2 AgCl (s)[/tex]Here, you need two silver (Ag) atoms and one chlorine (Cl2) molecule to produce two units of AgCl. Each chlorine molecule provides two chlorine atoms, which combine with the two silver atoms to form two AgCl units.
If the typo is ignored and we consider AgCl2, balancing a non-standard chemical equation may not be possible since the compound is not representative of known stable silver chlorides.
The image shows positions of the earth and the moon in which region would an astronaut feel the lightest
Answer:
The moon region
Explanation:
This is because there is little to no gravity on the moon. That is where the astronaut would feel the lightest.
Answer:
The moon region should be right i got it right on the test
Explanation:
If the mass of an object on earth is 100 kg what is it’s weigjt in earth
W = 980N. The weight of an object of 100Kg in the Earth is 980N.
The weight is a measure of the gravitational force acting on an object, the weight is equivalent to the force exerted by a body on a point of support, caused by the action of the local gravitational field on the mass of the body.
it can be defined as the product of mass by the acceleration of gravity, w = mg. Since weight is a force, its unit is the Newton N.
If the mass of an object on earth is 100 kg, then is weight is:
W = (100Kg)(9.8m/s²) = 980N.