A kg softball player slides into second base, generating J of thermal energy in her legs and the ground. How fast was she running?
Speed of the player is m/s
The frictional force is generated because of sliding; it's a dissipative force that converts the mechanical energy to thermal energy.Here is that the thermal energy generated and is change in mechanical energy.
Consider the above formula,
Here is that the initial speed, is that the final speed and is that the mass of player.Substitute for forand for
Therefore, the initial speed of the player was .
A hydroelectric power plant uses spinning turbines to transform the kinetic energy of moving water into electric energy with efficiency. That is, of the kinetic energy becomes electric energy. A small hydroelectric plant at the base of a dam generates of electric power when the falling water has a speed of . What is the water flow rate—kilograms of water per second—through the turbines?
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