A car is designed to get its energy from a rotating flywheel with a radius of 1.50 m and a mass of 430 kg. Before a trip, the flywheel is attached to an electric motor, which brings the flywheel's rotational speed up to 5,200 rev/min. Required:
a. Find the kinetic energy stored in the flywheel.
b. If the flywheel is to supply energy to the car as would a 15.0-hp motor, find the length of time the car could run before the flywheel would have to be brought back up to speed.

a

b

Explanation:

From the question we are told that

    The radius of the flywheel is  

      The mass of the flywheel is

          The rotational speed of the flywheel is

      The power supplied by the motor is  

     Generally the moment of inertia of the flywheel is  mathematically represented as

substituting values

The kinetic energy that is been stored is  

substituting values

Generally power is mathematically represented as

=>      

substituting the value

when two balls of the different masses are dropped from equal height, they reach the ground at the same time .this is because they experience the same acceleration.

the acceleration is independent of mass.

thus when they are dropped they will always maintain the same velocity and travel the same distance (neglect air resistance of course) at the same time.

im srry but ur wrong the answer is d a smooth rock, some red dirt, and an empty bird's nest.