Trucks can be run on energy stored in a rotating flywheel, with an electric motor getting the flywheel up to its top speed of 200p rad/s. Suppose that one such flywheel is a solid, uniform cylinder with a mass of 500 kg and a radius of 1.0 m.(a) What is the kinetic energy of the flywheel after charging

Explanation:

Radius, r = 1 m

Mass, m = 500 kg

w = 200 rad/s

Moment of inertia for a dolid symmetric cylinder, I = 1/2 × mr^2

KE = 1/2 × I × w^2

Therefore,

KE = 1/4 × m × w^2 × r ^2

= 1/4 × 500 × 200^2 × 1^2

= 5.0 × 10^6 J.

answer: option c. i.e. electric current flowing “downhill” from the negative electrode to the positive electrode in a battery

explanation:

the water analogy to the circuits define the pipes (water flows) to the electric current. now, we know that the electric current flows from the positive terminal to the circuit (as shown in the diagram attached).

hence, option c is the correct answer.