What is the unit of electrical energy in fundamental SI units?

• A

• B

• C

• D

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• 
• 
• 

The graph shows the variation of the acceleration a of an object with time t.

What is the change in speed of the object shown by the graph?

• 0.5 ms^-1

• 2.0 ms^-1

• 36 ms^-1

• 72 ms^-1

An elevator (lift) and its load have a total mass of 750kg and accelerate vertically downwards

at 2.0ms^-2.

What is the tension in the elevator cable?

• 1.5kN

• 6.0kN

• 7.5kN

• 9.0kN

A car travelling at a constant velocity covers a distance of 100m in 5.0s. The thrust of the engine is 1.5kN.

What is the power of the car?

• 0.75kW

• 3.0kW

• 7.5kW

• 30kW

A cyclist accelerates in a straight line. At one instant, when the cyclist is exerting a forward force of 40N, the air resistance acting on the cyclist is 10N.

What is the rate of change of momentum of the cyclist at this instant?

• 10 kgms^-2

• 30 kgms^-2

• 40 kgms^-2

• 50 kgms^-2

A student measures the radius r of a sphere with an absolute uncertainty ∆r. What is the fractional uncertainty in the volume of the sphere?

• A

• B

• C

• D

An object is projected vertically upwards at time t = 0. Air resistance is negligible. The object passes the same point above its starting position at times 2s and 8s.

If g = 10 m s^–2, what is the initial speed of the object?

• 50

• 30

• 25

• 4

A uniform ladder resting in equilibrium on rough ground leans against a smooth wall.

Which diagram correctly shows the forces acting on the ladder?

• 
• 
• 
• 

• 3/4

• 4/3

• 9/16

• 16/9