WEP

Question 1

define work done by a force on a body

Answer 1

The product of the force and the displacement of the body in the direction of the force

Question 2

Formula for work done

Answer 2

Fs*cos(angle)

dP/dV

Question 3

Define elastic potential energy

Answer 3

The energy stored in a body due to its deformation when it is stretched or compressed

Question 4

Formula for elastic potential energy

Answer 4

1/2(Fx)
1/2(kx^2)

Question 5

Define kinetic energy

Answer 5

The energy possessed by a body due to its motion

Question 6

Formula for kinetic energy

Answer 6

1/2(mv^2)

Question 7

Define gravitational potential energy

Answer 7

The energy possessed by an object due to its position in the gravitational field

Question 8

formula for gravitational potential energy

Answer 8

mgh

Question 9

Principle of conservation of momentum of energy

Answer 9

Energy can neither be created nor destroyed, but can be transformed from one form to another

Question 10

Define power

Answer 10

The rate at which work is done

Question 11

Efficiency formula

Answer 11

(useful energy output)/(energy input)

Question 12

Define energy efficiency

Answer 12

The energy efficiency of a device is the ratio of useful energy output to the energy input

Question 13

Derive work done by an expanding gas.

Answer 13

W = Fx = (pA)(ΔV/A) = (p)(ΔV)

Question 14

Derive power

Answer 14

P = dW/dt = d(FS)/dt = Fv