Question

- When a person does work on an object, the object gains energy. As a bicycle rider rides from the bottom to the top of a hill, the

energy from the work can become which combination of types of energy.
The riders work becomes kinetic energy only
The riders work becomes a combination of kinetic energy and heat
The riders work becomes a combination of gravitational potential and heat
The riders work becomes a combination of gravitational potential,
energy and heat

Answer 1

4

Step-by-step explanation:

Answer 2

The riders work becomes a combination of gravitational potential,

kinetic energy and heat.

Step-by-step explanation:

His work becomes gravitational potential as the raider gains height. This can be seen from the equation of gravitational potential:

`U = m*g*h`,

where m is the mass, g is the gravity and h is the height. Since the rider's final position is higher than his starting position the change of gravitational position is greater than 0.

His work becomes kinetic energy as he gains speed: assuming he was at rest at starting position he must increase his speed to move to the top of the hill, and because kinetic energy depends on speed, part of his work becomes kinetic energy.

Finally, part of his work turns into heat due to all the losses because of the friction in the bicycle gears.