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Conservation of Energy

Conservation of Energy

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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
Two blocks are connected by a rope as shown on the right. Block m2 with mass of 2.5 kg hangs freely from the rope. Block m1 with mass of 1.5 kg is connected to the other end of the rope, and is on a rough surface with coefficient of friction of 0.2. It is
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
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 bullet has a mass of 7.5 g. It is fired into a ballistic pendulum. The pendulums receiving block of wood is 2.5 kg. After the collision, the pendulum swings to a height of 0.1 m. What is the approximate velocity of the bullet?
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
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?
As shown on the right, a block of mass 7.2 kg is connected through a pulley, to a spring with spring constant 28 N/m. Initially, the mass is held at a level which leaves the spring unstretched. How far down will m go when released?
An object has 50 J of gravitational potential energy when it is 10 m off the ground. How much kinetic energy will a twice-as-massive object have if it is held 20 m off the ground?
A sphere (mass = m, radius = R, moment of inertia =2/5 mR^2) is sliding on a frictionless table with linear speed v. An identical sphere is spinning on the same table (not sliding) about its center with an angular velocity, w. What is the ratio between