Assuming 95.0% efficiency for the conversion of electrical power by the motor, what current must the 14.5 V batteries of a 921 kg electric car be able to supply: (a) to accelerate from rest to 24.1 m/s in 1.00 min, (b) to climb a 187 m-high hill in 2.00 min, and (c) to maintain a constant 24.1 m/s speed while exerting 467 N of force to overcome air resistance and friction

r=rho l/a where a is the area, l is the length and rho is resistivity so the greater the area the lesser the resistance thats why the earth pin is thicker bcos current follow the shortest path, so less resistive .

the motion of a pendulum is a classic example of mechanical energy conservation. a pendulum consists of a mass (known as a bob ) attached by a string to a pivot point. as the pendulum moves it sweeps out a circular arc, moving back and forth in a periodic fashion.

your answer is c! hope this : )