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mamaluj [8]
3 years ago
14

As the object in the picture moves from point A to point D across the surface, the sum of the gravitational and kinetic energies

_____. A. decreases only B. increases and then decreases. C. decreases and then increases. D. remains the same. The object will have the maximum Kinetic Energy at point___. A B C D The object will have the maximum Potential Energy at point____. A B C D If the car has a mass of 1000kg and starts at rest, what is the speed of the car at point C
Physics
1 answer:
Afina-wow [57]3 years ago
7 0
Answer:
d. remains the same
Explanation:
We know that if there is no external resistive force then the total energy of the system remains constant.
The total energy is the summation of kinetic and potential energy.
When an object moves from point A to another point D then the total energy, potential gravitational and kinetic energy will remain same.

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A 4.0 kg mass is attached to a spring whose spring constant is 950 N/m. It oscillates with an amplitude of 0.12 m. What is the m
Fudgin [204]

Answer:

velocity = 2.62m/s

Explanation:

950= (4 x A)/0.12

950 x 0.12 = 4 x A

114 = 4 x A

A = 114/4

A = 28.5m/s²

  • U²=2as
  • U² = 2 x 28.5 x 0.12
  • U² = 6.84
  • U = √6.84
  • U = 2.62m/s
3 0
3 years ago
If an alpha particle and a beta particle have the same energy, which particle will penetrate farther into an object?
lidiya [134]

Answer:

Beta particle

Explanation:

If an alpha particle and a beta particle have the same energy, beta particle will penetrate farther into an object than alpha particle because;

1. In air, beta particles can travel a few hundred times farther than alpha particles.

2. Beta particles have more penetrating power than alpha particles.

3. Alpha particle can be absorbed or stopped by an inch or less 1-2 centimeters of air or a thin piece of tissue while beta particles can be stopped or absorbed by a thin layer of Aluminium.

4. Alpha particles loose all of their energies in a small volume easily that beta particles.

5. Beta particles can traveled a longer distance between 2-3 meters at a speed nearly equal to that of light than alpha particles which travel a distance between 2-4 cm at a speed approximately five percent the speed of light.

5 0
3 years ago
В каких из перечисленных случаев тело приобретает потенциальную энергию? А) воду в реке поднимают с помощью плотины В) пуля выле
Dennis_Churaev [7]

Answer: D) a stone lies on the ground

Explanation:

Potential energy this is defined as the mechanical energy, energy stored, or energy created by the position of an object. Example; energy possessed by a ball while hanging at the top of a steep hill when about to roll down is called a potential energy. This is same as a stone which lies in a floor.

4 0
3 years ago
Which of the following represents a covalent compound?<br><br> KF<br> NaCl<br> SBr3<br> Mg2O
slava [35]

Answer:

SBr3 is a covalent compound

5 0
4 years ago
A hockey puck with a mass of 0.18 kg is at rest on the horizontal frictionless surface of the rink. A player applies a horizonta
Leya [2.2K]

Hello!

\large\boxed{0.018 N}

Begin by finding the acceleration of the puck. Use the kinematic equation:

d = v_{i} + \frac{1}{2}at^{2}

The initial velocity is 0 m/s since the object was at rest, so we can rewrite the equation as:

d =  \frac{1}{2}at^{2}

Plug in the given distance and time:

1.25 = \frac{1}{2}a(5^{2})\\\\2.50 = 25a\\\\a = 0.1 m/s^{2}

Find the net force using the formula F = m · a (Newton's Second Law)

F = 0.18 · 0.1

F = 0.018 N

6 0
3 years ago
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