Given data
ball throws upwards at an angle 60°
Horizontal component (Vh) = 12.5 m/s,
Vertical component (Vv) = 21.7 m/s ,
The magnitude of throw/resultant velocity (V) = ?
The resultant velocity /the velocity with which ball is throws is determined by the following equation
V = √[(Vh)² + (Vv)²]
= √[(12.5)² + (21.7)²]
= 25.04 m/s
The resultant velocity or the velocity with which the ball is thrown is 25 m/s
Answer:
d
Explanation:
The acceleration stays the same. Velocity is the one that changes.
A person drives an automobile with a mass of 450 kilograms at a velocity of 26 meters per second. The driver accelerates to a velocity of 30 meters per second. The difference in the automobile’s kinetic energy between the two velocities is joules. You may use the calculator.
To answer the question, we shall determine the kinetic energy of the automobile in each case. This can be obtained as illustrated below:
Case 1:Mass (m) = 450 Kg
Velocity (v₁) = 26 m/s
Kinetic energy (KE₁) =?KE₁ = ½mv₁²
KE₁ = ½ × 450 × 26²
KE₁ = 225 × 676
KE₁ = 152100 JCase 2:Mass (m) = 450 Kg
Velocity (v₂) = 30 m/s
Kinetic energy (KE₂) =?KE₂ = ½mv₂²
KE₂ = ½ × 450 × 30²
KE₂ = 225 × 900
KE₂ = 202500 JFinally, we shall determine the difference in the kinetic energy of the automobile. This can be obtained as illustrated below:
Kinetic energy of case 1 (KE₁) = 152100 J
Kinetic energy of case 2 (KE₂) = 202500 J
Difference =?Difference = KE₂ – KE₁
Difference = 202500 – 152100
Difference = 50400 JTherefore, the difference in the kinetic energy of the automobile is 50400 J
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The difference in the automobile's kinetic energy between the two velocities is -12.15 kJ.
Explanation:The kinetic energy of an object is given by the formula KE = 1/2mv², where m is the mass of the object and v is its velocity. To find the difference in kinetic energy between two velocities, we can subtract the initial kinetic energy from the final kinetic energy. Given that the initial mass of the automobile is 450 kg and its initial velocity is 26 m/s, and the final velocity is 30 m/s, we can calculate the initial and final kinetic energies using the formula.
Initial kinetic energy = 1/2(450 kg)(26 m/s)² = 1/2(450 kg)(676 m²/s²) = 72900 J or 72.9 kJ.
Final kinetic energy = 1/2(450 kg)(30 m/s)² = 1/2(450 kg)(900 m²/s²) = 60750 J or 60.75 kJ.
Difference in kinetic energy = Final kinetic energy - Initial kinetic energy = 60750 J - 72900 J = -12150 J or -12.15 kJ.
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A railroad train is traveling at 32 m/s in still air. The frequency of the train whistle is 350 Hz. What is the wavelength of the sound and the frequency of the sound heard by the listener in front of the locomotive?
40. 383 Hz, 0.9 m
6. 20.78 m/s
Explanation:40. You know the pitch will be increased when the train is moving toward you. The only answer choice that is greater than 350 Hz is the one shown above.
Using the formula shown in the attachment, we compute the observed frequency to be ...
... f' = (343 m/s)/(343 m/s -32 m/s)×(350 Hz) ≈ 1.102893×350 Hz ≈ 386 Hz
The wavelength is given by ...
... λ = v/f = (343 m/s)/(386 Hz) ≈ 0.8886 m ≈ 0.9 m
_____
Comment on the answer choice
If you erroneously use the frequency modification formula f'=(v+vo)/v·f, then you get 382.7 Hz ≈ 383 Hz. We suspect an error in the answer key. Have your teacher show you how to work this problem.
__________
6. The velocity can be computed from the acceleration and distance covered by ...
... v = √(2ad)
... v = √(2·9.8 m/s²·22 m) = (√431.2) m/s ≈ 20.77 m/s
The closest answer among those offered is 20.78 m/s. Again, you should have your teacher show you how to work this problem to arrive at the offered answer.
One
I putting this up because I have answers. This is another doppler effect problem.
Givens
f = 350 Frequency in Hz of the train whistlev = 343 m/s Speed of soundvs = 32 m/s Train's speed moving towards the observer vo = 0 The observer is standing stillf' = ?? What the observer thinks the frequency isFormula
f' = (v + vo) * f / (v - vs)Solution
f' = (342 + 0)*350/(342 - 32)f' = (342)*350 / 310f' = 386 Hzv= f * wavelength
v = 343 m/s
f = 386 Hz
343 = 386 * wavelength
343 / 386 = wavelength
wavelength = 0.881 m
Answer: 386, 0.9 C
Problem Two
Givens
d = 22 ma = 9.81vi = 0vf = ?Formula
vf^2 = vi^2 + 2*a * dSolution
vf^2 = 2 * 9.81 * 22vf^2 = sqrt(431.64)vf = 20.78Answer: A
Note to get 20.78 they used 9.8 but then there should only be 2 places and the answer (rounded) is 21. Otherwise the answer is 20.77
please help on this one? The mass on the spring in this diagram is in harmonic motion between x = -5cm and x=5cm
Select the correct answer.
How does the law of conservation of energy apply to machines?
A.
Machines create energy from scratch.
B.
Machines consume energy until no energy remains.
C.
Energy transferred to a machine equals energy transferred from it.
D.
Engineers break the law of conservation of energy by using machines.
Energy transferred into a machine equals energy transferred out of it (including waste heat generated by friction). (C)
pitbulllover101
Rutherford's famous gold foil experiments shot heavy particles at a thin sheet of gold foil. What did he observe, and why did these observations eventually result in the addition of a nucleus to the atomic model?
Some of the heavy particles bounced off the foil, because there are positive particles spread throughout the atom.
Some of the heavy particles bounced off the foil, because there is a dense, positive area in the atom.
The heavy particles all passed straight through the foil, because the atoms are mostly empty space.
The heavy particles all bounced off the foil, because the subatomic particles have mass and volume.
Some of the heavy particles bounced off the foil, because there are positive particles spread throughout the atom
Answer:
Some of the heavy particles bounced off the foil, because there is a dense, positive area in the atom.
Explanation:
In Rutherford experiment following is the observations made by the Rutherford
1). Major part of the alpha particles will go out undeviated which shows that major portion of the atoms vacant or empty space
2). Few part of the alpha particle moves out with deviation in path which shows that electrons moves in different shells and when alpha particles pass through a given electron then it will show the deviation in path
3). very few alpha particles will get deviated by 180 degree and returns to original path which shows the presence of nucleus. So nucleus is made up of positive charge which is concentrated at very small space
so here correct answer would be
Some of the heavy particles bounced off the foil, because there is a dense, positive area in the atom.
What three types of heat transfers involve heat flow to hot object sto colder objects
There are exactly three ways to move heat from one place to another:
-- conduction
-- convection
-- radiation
indicate whether the statement is true or false the synthesis of a large collection of information that income passes well tested hypothesis about certain aspects of the natural world is known as scientific theory
Answer: True
The statement " the synthesis of a large collection of information that encompasses well tested and verified hypothesis about certain aspects of natural world is known as "scientific theory".
It was proposed by Charles Darwin and Alfred Russel in the mid 19th century.
Typically, it is about the relationship between various facts and is a way of providing a concise explanation for what's been observed. A scientific theory is a well- substantiated explanation of an aspect of the natural world.
Which would take more force to stop and 10 seconds 8 kg ball rolling in a straight line at a speed of 0.2 m/s or a 4 kg ball rolling along the same path at a speed of 1 m/s
Answer:
It takes more force to stop the 4kg ball rolling at 1m/s.
Explanation:
To stop a ball rolling at 0.2 m/s in 10 seconds means the uniform deceleration needs to be (0.2/10) m/s/s = 0.02 m/s^2. To achieve that on a mass of 8kg requires a (force) = (mass) x (acceleration) = (8kg) x (-0.02 m/s^2) = -0.16 N (negative because it is an opposing force).
To stop a 4kg ball rolling at 1 m/s along the same path as above (implying in 10 seconds of uniform deceleration), will take a deceleration of (1/10 m/s^2) and a (force) = (4kg) x (-0.1 m/s^2) = -0.4 N.
It takes more force to stop the 4kg ball rolling at 1m/s.
(For your interest: you could decide this question also by calculating which ball has the larger kinetic energy and argue that, consequently, to stop that ball a larger force is needed. Kinetic energy is proportional to the square of force exerted)
Which of the following types of particles can be categorized into different kind of elements?
A. Protons
B. Atoms
C. Electrons
D. Neutrons
The answer would be atoms
Answer: The correct answer is Atom.
Explanation:
Atom consists of proton, electron, neutron and nucleus. The subatomic particles of the atom are electron, proton and neutron.
The electrons revolve around the nucleus while neutrons and protons are located in nucleus. The whole mass of the atom is supposed to be concentrated at nucleus.
The electron is negatively charged particle. The proton is positively charged particle. The neutron has no charge. It is neutral.
Therefore, the correct option is B.
The moon has a mass of 7.35 E 22 kg and is located 3.84 E 8 meters from the Earth. If Ellen, an earthling, has a mass of 47 kg, what is the gravitational force between Ellen and the moon? I found the correct answer but I am confused on how I did so, please explain.
Under the law of universal attraction:F=km₁m₂/r²=6.67*10⁻¹¹*7.347*10²²*47/3.844*10⁸=23.0321*10¹³/3.844*10⁸=5.99*10⁵≈6*10⁵ N
It's probably going to be a phase out of the approximations
PLSSSSS help how much gravitation potential energy does a 5kg object have when it is 10 meters off the ground????
Considering the equation for gravitational potential energy, PE=mgh, where m as mass, g as the acceleration due to gravity, and h has the height.
Substituting the numbers given, you’ll get (taking g as 9.81)
PE = 5 x 9.81 x 10
PE = 490.5 J
Therefore the gravitational potential energy will be 490.5 J
The gravitational potential energy of a 5kg object at a height of 10 meters is 490 Joules.
Explanation:The gravitational potential energy of an object can be calculated using the formula U = mgh, where U is the gravitational potential energy, m is the mass of the object, g is the acceleration due to gravity, and h is the height of the object. In this case, we have a 5kg object at a height of 10 meters. Plugging the values into the formula, we get:
U = (5kg) * (9.8m/s^2) * (10m) = 490 J
Therefore, the 5kg object has 490 Joules of gravitational potential energy when it is 10 meters off the ground.
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Which federal agency makes sure federal wildlife laws are followed?
) US Forest Service
) US Fish and Wildlife Service
) Bureau of Land Management
) National Park Service
Answer:
US Fish and Wildlife Service
Explanation:
There are different federal agencies in the United States of America such as US Forest Service, US Fish and Wildlife Service, Bureau of Land Management and National Park Service. The US Forest Service is the agency that conducts the management of land and other agricultural related services. The Bureau of Land Management is involved with the administration of public lands in the United States. The National Park Service generally conducts the management of all the national parks in the United States. Therefore, the agency that ensures that federal wildlife laws are strictly adhere to is the US Fish and Wildlife Service.
The light bulb converts electrical energy into light and _________. A) chemical Eliminate B) electromagnetic C) heat D) nuclear
Answer: C) heat
Explanation: As law of conservation of energy applies to all the systems, which says the energy cannot be created nor destroyed, it can only be converted from one form to another.
The light bulb converts electrical energy into light and heat energy.
A) chemical energy is stored in the bonds.
B) Light is a form of electromagnetic radiation.
D) nuclear energy is stored in the nucleus of the atom.
How does the density of the metal in the crushed can compare with the metals density before the can was Crushed
dens = mass/volume. after crushing, vol less so density more. the actual density of the metal is the same, density of can changes
The density of a metal can, whether it is crushed or not, remains the same because density is an intrinsic property of matter, dependent only on the mass and volume of the substance. Changing the can's shape alters its volume but does not affect its mass or its density.
Explanation:The density of a substance is the ratio of its mass to its volume (Density = Mass / Volume). This physical property is intrinsic to the substance, meaning it doesn't change regardless of the quantity or form the material is in.
When you crush a metal can, you're changing its shape and thereby altering its volume. However, the mass remains the same because you haven't removed or added any material. As a result, the density of the metal in the crushed can stays the same as the metal's density before the can was crushed.
Let's consider a practical example: a block of brass and a piece of rebar. Both have the same mass and are made of the same metal, but the block of brass has a larger volume. Nevertheless, the densities of these substances remain constant. That's because density is an intrinsic property, reflecting the compactness of material in a substance. Hence, even though you change the can's shape (thus, its volume), you have no impact on the metal's density.
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The launching velocity of a missile is 20.0 m/s, and it is shot at 53? above the horizontal. What is the vertical component of the velocity at launch?
Answer:
The vertical component of the velocity is about 16 m/s.
Explanation:
The vertical component is the magnitude of the velocity reduced by the sinus of the angle 53 degrees. So
[tex]v_y = |v|\cdot \sin 53^\circ = 20.0 \frac{m}{s}\cdot 0.7986 \approx 16.0 \frac{m}{s}[/tex]
Which of the following statements best describes a covalently bonded material?
A. It is a conductor.
B. It is an insulator.
C. It readily allows electricity to flow.
D. It contains delocalized electrons.
It is an insulator because it doesn't conduct electricty.
Answer: Option (B) is the correct answer.
Explanation:
A conductor is defined as a substance that allows flow of electrons through it due to which there will be flow of electric current.
Whereas an insulator is defined as a substance through which there will be very less or no flow of electrons. As a result, there will be no flow of electric current through it.
Also, when a material is covalently bonded then it means sharing of electrons has taken place between its atoms. And, covalent materials do not allow flow of electric current through it because of no presence of free electrons or ions.
Thus, we can conclude that the statement it is an insulator best describes a covalently bonded material.
If Angle "a" is 25°, Angle "b" is:
A) equal to Angle c
B) less than Angle c
C) greater than Angle c
Since angles a and c are alternate interior angles formed by a transversal intersecting two parallel lines, they are congruent. Therefore, angle b must also be equal to angle c. So, the correct answer is: A) equal to Angle c
If angles "a," "b," and "c" are part of a triangle, then the sum of the interior angles of a triangle is always 180°. Given that angle "a" is 25°, the sum of angles "b" and "c" must be 180° - 25° = 155°.
With this constraint, we can't determine whether angle "b" is greater than, equal to, or less than angle "c" without additional information about their specific values. If one angle is specified, the other angle can be found using the fact that the sum of angles in a triangle is 180°. For example, if angle "c" is known to be, say, 70°, then angle "b" would be 155° - 70° = 85°.
In summary, the relationship between angle "b" and angle "c" depends on their specific values or additional constraints provided. Without this information, we cannot make a definitive comparison between them. Therefore, the correct answer to the given question would be that we cannot determine the relationship between angle "b" and angle "c" based solely on the measure of angle "a."
A sprinter generates a constant force of 52 N as he runs 100 m. How much work did he do?
Why does an object in motion stay in motion unless acted on by an unbalanced force? A) because forces are what stop and start motion B) because balanced forces can not exist in nature C) because motion is the inherent state of all matter Eliminate D) because motion, once begun, continues to accelerate
Kinetic molecular theory says that as water molecules absorb energy, their motion and temperature __________ and the sample becomes ___________. A) increase, warm B) expand, larger C) decrease, solid D) stays the same, smaller
A) increase, warm... would correct.
The kinetic molecular theory says that as water molecules absorb energy, their motion and temperature INCREASE and the sample becomes WARM (Option A).
The kinetic molecular theory is a thermodynamic classical model used to explain the behavior of gases.
This theory (kinetic molecular theory) was used to establish different principles in thermodynamics.The kinetic molecular theory indicates that gases are in constant movement (motion) and their particles show elastic collisions.In conclusion, the kinetic molecular theory says that as water molecules absorb energy, their motion and temperature INCREASE and the sample becomes WARM (Option A).
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Which is not one of the three tiny bones in the middle ear?
cochlea
hammer
anvil
stirrup
The average ear (Auris media) is the middle part of the ear and consists of the tympanic membrane, the Eustachio tube and the oval and round windows. In the tympanic cavity are contained the oscillations of the middle ear. Timpan has the role of transforming the sounds collected by the external ear into vibrations, which are sent to the three oscillators (hammer, anvil and stair). In turn, they send the vibrations to the inner ear.
So the cochlea is not part of the average ear
The cochlea is not a bone in the middle ear; the three tiny bones are the malleus (hammer), incus (anvil), and stapes (stirrup), which transmit and amplify vibrations for hearing.
Among the options provided, the cochlea is not one of the three tiny bones in the middle ear. The three bones in the middle ear are known as the malleus (hammer), the incus (anvil), and the stapes (stirrup).
These bones are crucial for hearing as they work to transmit the vibrations from the tympanic membrane to the oval window of the cochlea. The hammer, anvil, and stirrup are the smallest bones in the body and help in amplifying and transferring sound waves into the inner ear.
please help on this one ?
what type of friction occurs when you are trying to move an object, but the object isnt moving?
rolling friction
momentum friction
static friction
sliding friction
the answer is static friction
Answer:
Static friction.
Explanation:
I had this question, it was worded a bit differently. Hope this helped!
A 1.0 kg weight suspended from a spring is pulled to 0.50 m below its equilibrium point. If the spring has a spring constant (k) of 50.0 N/m, at what rate will the mass accelerate when it is released?
A) 25 m/s²
B) 6.3 m/s²
C) 100 m/S²
D) 3.7 m/s²
m = mass of the weight suspended = 1 kg
x₀= stretch in the spring at equilibrium = ?
k = spring constant of the spring = 50.0 N/m
using equilibrium of force ,
spring force on the weight = force of gravity on the weight
k x₀ = mg
50 x₀ = (1 x 9.8)
x₀ = 0.196 m
x = distance by which the weight is pulled below equilibrium = 0.50 m
a = acceleration of the weight
F = spring force on the weight in upward direction ,
force equation for the motion of weight is given as
F - mg = ma
k (x + x₀) - mg = ma
(50)(0.50 + 0.196) - (1) (9.8) = 1 a
a = 25 m/s²
1. A 3 kg lunch box is pushed across the lunch table. The acceleration of the lunch box is 2.0 m/s2. What was the net force applied to the lunch box?
2. Find the weight of a 10 kg rock. Remember, acceleration due to gravity is -9.8 m/s2.
Please show your work.
(1) Answer:
6 Newtons
Explanation:
The net force is (mass) x (acceleration) = (3 kg) x (2.0 m/s^2) = 6 N
(2) Answer:
-98 Newtons
Explanation:
Weight (force due to gravity) is (mass) x (gravitational acceleration) = (10 kg) x (- 9.8 m/s^2) = -98 N
The negative sign due to negative acceleration indicates the gravitational force pointing in the negative direction within the defined coordinate system.
The gas used to fill party ballons contain only helium atoms .This make helium a(n).
a gas
hope this is right
the anser on apex is element
The average speed of a runner in a 400 meter race was 8.0 meters per second how long did it take the runner to complete the race
Answer:
If it is eight meters per second, and the total distance he has to travel is four hundred meters to complete the race, you divide the total length needed to travel by the average speed per second to see the amount of seconds required to complete the race at that speed.8 meters per second: Speed of runner400 meters: Total distance400/8=50.50 seconds to complete the race at the eight of 8m/s.
what is the net force of this object?
F air=400N
F grav=600N
A) 0 nuetons
B) 200 nuetons
C) 400 nuetons
D) 600 nuetons
B The object is fallint with pressure pushing up, so 600N-200N=400N
Adding resistant transfer wires to complete a circuit will A. Decrease the rate of electrical flow B. Increase the rate of electrical flow C. Not change the rate of electrical flow D. Completely stop the flow of electricity
A. Decrease the rate of electrical flow
more resistance = lkess current
A rowboat passenger uses an oar to push the boat off the dock by exerting a force of 40N for 3.0s. What impulse acts on the boat.
Answer:
120 Ns
Explanation:
The impulse exerted on an object is given by:
[tex]I=Ft[/tex]
where
F is the force applied
t is the time taken
In this problem, we have:
F = 40 N
t = 3.0 s
So, the impulse acting on the boat is
[tex]I=Ft=(40 N)(3.0 s)=120 Ns[/tex]
Answer:
120kg*m/s
Explanation: