Physics Practice Questions - ATPL8

How much work must be done by a force on a 100kg body in order to accelerate it from 0 to 20 m/s in 10 seconds?

• 2 × 10³ J

• 4 × 10³ J

• 2 × 10⁴ J

• 4 × 10⁴ J

A railway truck with a mass of 10000kg rolling at 5m/s collides with a stationary truck of mass 12500kg. The trucks join together. At what speed do they move after the collision? Note: we shall assume that friction forces are small enough to ignore, so we can apply the law of conservation of momentum.

• 2.2m/s

• 3.5m/s

• 1m/s

• Cannot be determined

An engine reaches its top speed from rest in 7.5s. It is able to perform 250,000J of work in that time. The power of the engine is _________.

• 1.8kW

• 33.3kW

• 298kW

• 41kW

If 150 Joules of work is needed to move a box 10m, what force was used?

• 1500N

• 15N

• 1.5N

• 150N

Fahrenheit may be converted to Celsius by using the equation

The slope of a velocity time graph represents the _________.

• Velocity of the object

• Displacement of the object

• Acceleration of the object

• Momentum of the object

A fluorescent lamp is 25% efficient. Choose the statement that correctly describes how the lamp performs.

• 25% of the energy supplied to the lamp is lost along the way.

• 25% of the energy supplied to the lamp is transferred to light.

• 75% of the energy supplied to the lamp is transferred to light.

• The lamp is not working properly.

A mass of 500kg moves 42m with a force of 85N. What is the work produced?

• 3570J

• 210000J

• 10800J

• None of the above.

The stability of a body is increased by _______________________________.

• raising the position of its CoG and decreasing the width of its base

• lowering the position of its CoG and increasing the width of its base

• increasing the mass of the body

• raising the position of its CoG and increasing the width of its base

• lowering the position of its CoG and decreasing the width of its base

If you push an object with force of 8N for 12m in 6s, how much power is used?

• 18W

• 16W

• 30W

• 24W