Question 1

Find the kinetic energy of a 25,000-kg truck moving at 105 km/h

Accepted Answer

$1.06	imes10^{7}$J

Answer

$2.06	imes10^{7}$J

Answer

$4.06	imes10^{7}$J

Answer

$3.06	imes10^{7}$J

Question 2

A large household air conditioner consumes 18 kW of power and is turned on for 4 hours every day. How much energy would this appliance use in a day?

Accepted Answer

$2.6	imes10^{8}$J

Answer

$4.6	imes10^{8}$J

Answer

$1.6	imes10^{8}$J

Answer

$3.6	imes10^{8}$J

Question 3

A 500-kg dragster accelerates from rest to a final speed of $200 ms^{-1}$ in a distance of 500 m. Find the force required for this increase in speed.

Accepted Answer

20,000N

Answer

30,000N

Answer

10,000N

Answer

40,000N

Question 4

A ball of mass 10 kg is dropped from rest at a height of 40 m. What is the initial gravitational potential energy of the ball?

Accepted Answer

3920J

Answer

1920J

Answer

4920J

Answer

2920J

Question 5

A ball of mass 10 kg is dropped from rest at a height of 40 m. Calculate the speed of the ball after it has dropped 15m.

Accepted Answer

$17.1ms^{-1}$

Answer

$15.1ms^{-1}$

Answer

$11.1ms^{-1}$

Answer

$13.1ms^{-1}$

Question 6

A ball of mass 10 kg is dropped from rest at a height of 40 m. Calculate the speed of the ball after it has dropped to the bottom.

Accepted Answer

4900J

Answer

5900J

Answer

3900J

Answer

2900J

Question 7

An electric car with an engine with power 18,000W travels at $30ms^{-1}$.
Find the force on such a car, assuming friction and air resistance is negligible.

Accepted Answer

600N

Answer

400N

Answer

700N

Answer

500N

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