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3. A 50.0-kg child on a 2.0 m long swing is released from rest when the swing supports make an angle of 30 degrees with the vertical.
a. What are the potential and kinetic energies of the child before being released?
b. Neglecting friction, what are the potential and kinetic energies of the child at the lowest position?
c. Find the child's speed at the lowest position
d. If the speed of the child at the lowest position is 0.10 m/s, what is the mechanical energy lost due to friction?
A heat engine has a maximum possible efficiency of 0.800. If it operates between a deep lake with a constant temperature of 287.0 k and a hot reservoir, what is the temperature of the hot reservoir?
the 25g bullet travelling at 350m/s strikes a block of wood. The block of wood exerts an average force of 50,000N opposing the motion of the bullet. How far does the bullet penetrate while stopping.
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A 0.20 kg aluminium plate with an initial temperature of 20 degrees c slides down a 15.00m long surface that is inclined at 30 degrees to the horizontal.
A 40 percent efficient electric power plant produces 900MW of electric power and discharges waste heat into 30 C ocean water. Suppose the waste heat could be used to heat homes during the winter instead of being discharged into the ocean. A typical A..
How much time does it take to lift container with the motor.
A 200g ball on a 60 {cm}-long string is swung in a vertical circle about a point 200 {cm} above the floor.
A 144-g baseball moving 29m/s strikes a stationary 5.25-kg brick resting on small rollers so it moves without significant friction. Determine the baseball's speed after the collision
A 30.0 g goldfinch lands on a slender branch, where it oscillates up and down with simple harmonic motion of amplitude 0.0489 m, What is the maximum speed of the goldfinch
A 8.00×106 ? resistor and a 0.80 ?F capacitor are connected in series with an ideal battery of 10.00 V. How much energy was provided by the battery?
A solid sphere of mass 2.5 kg and a radius 0.15m starts from rest at the top of the a ramp inclined 15 degrees, What is the total kinetic energy of the sphere when it reaches the bottom of the ramp
Two physical pendulums ( not simple pendulum) are made from sticks that are suspended from the ceiling at one end. The sticks are uniform and are identical in all respects, except one is made of wood (mass = 0.17 kg )and the other of metal (mass =..
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