Conservation of Energy

Conservation of Energy Principles

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A stone is propelled vertically off the ground. After it is released, which of the following are true?(A) Its kinetic energy decreases.(B) Its total mechanical energy increases.(C) Its gravitational potential energy increases.(D) Its total energy is propo
Some "extreme sport fun loving person" wants to go bungee jumping. They're not sure if the cord is strong enough to stop them from hitting the ground, but decide to jump and try anyway. The bungee cord's "strength" is measured by its spring constant, whic
A body with a moment of inertia 4 kg.m^2 accelerates constantly from rest with an angular acceleration of 5 rad/s^2. How much time does it take to obtain a rotational kinetic energy of 800 J?
A yo-yo of radius 2.8 cm is held so that its centre is 1.2 m above the ground. It is released and dropped. When it is 0.30 m above the ground, it stops falling, then quickly rises back up in the air. What is the rotational velocity of the yo-yo at its low
Which of the following statem ents are true?(A) The total mechanical energy of an object subject only to conservative forces is constant.(B) The energy transferred by nonconservative forces is path dependent.(C) The energy transferred by conservative forc
A 31kg child on a swing reaches a maximum height of 1.92m above her rest position. Assuming no loss of energy: 1. What will be her maximum speed through the swing. 2. Assuming this maximum height was the result of one push from her parent, what was the av
An 800.0-kg car is traveling along a wet road at a velocity of 25.5 m/s. A 1000.0-kg car is traveling along the same road in the same direction at 34.7 m/s. The two cars collide and lock together. Answer the following questions.
Object 1 has a moment of inertia of 8 kg.m^2, and Object 2 has a moment of inertia of 2 kg.m^2. If Object 1 is rotating with an angular velocity of 1 rad/s, what angular velocity would give Object 2 the same rotational kinetic energy?
A 0.75 kg block is held at rest against a spring compressing it 27.0 cm. The spring constant is 735 N/m. The block is released and it begins to move toward a loop across a frictionless surface. How much kinetic energy does the block have when the spring i
The graph below shows the external force applied to a 15-kg object throughout a displacement of 8 m.- How much work was done on the object throughout the 8-m displacement?- If the object was initially moving at 4.0 m/s (before the force was applied), calc

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