AS Physics Mechanics, Electricity & Circuits

A farmer is trying to lift the corner of a large water tank. She uses a metal rod as a lever. The vertical force from the farmer is constant and is always applied to the end of the rod. Which change must increase the upward force on the water tank?

• using a longer rod and moving the pivot closer to the tank
• using a longer rod and moving the pivot further away from the tank
• using a shorter rod and moving the pivot closer to the tank
• using a shorter rod and moving the pivot further away from the tank

Five energies are listed. 5kJ 5 mJ 5 MJ 5nJ Starting with the smallest first, what is the order of increasing magnitude of these energies?

• 5kJ → 5 mJ → 5 MJ → 5nJ
• 5nJ → 5 kJ → 5MJ → 5 mJ
• 5nJ → 5 mJ → 5kJ → 5 MJ
• 5 mJ → 5nJ → 5kJ → 5 MJ

Which of the following correctly expresses the volt in terms of SI base units?

• AΩ
• WA^-1
• kg m^2 s^–1 A^–1

• kg m^2 s^–3 A^–1

A probe is used to monitor the quality of the water in the sea. The probe is suspended by a vertical string which is attached to a sphere. The sphere has a weight of 5.00 N. The probe and string have a combined weight of 2.00 N. The density of the seawater is 1.03 × 10^3 kg m^–3. The upthrust acting on the probe and thread is negligible. What is the volume of the sphere below the surface of the sea? The stationary sphere floats in equilibrium on the surface of the sea, as shown.

• 1.98 × 10^–4 m^3

• 2.97 × 10^–4 m^3

• 4.95 × 10^–4 m^3

• 6.93 × 10^–4 m^3

A ball is kicked so that it has an initial velocity of 12 ms^-1 at an angle of 50 degrees to horizontal ground. Assume that air resistance is negligible. What is the maximum height the ball reaches?

• 0.47m
• 3.0m
• 4.3m
• 7.3m

An escalator in an underground station has 25 people standing on it and is moving with a speed of 4.3 m s^–1. The average mass of a person is 78kg and the angle of the escalator to the horizontal is 40°. What is the minimum power required to lift these people?

• 5.4kW
• 6.4kW
• 53kW
• 64kW

In the potentiometer circuit shown, the reading on the ammeter is zero. The light-dependent resistor (LDR) is then covered and the ammeter gives a non-zero reading. Which change could return the ammeter reading to zero?

• decreasing the supply voltage
• increasing the supply voltage
• moving the sliding contact to the left
• moving the sliding contact to the right

An aircraft travels along a horizontal path. Two of the forces that act horizontally on the aircraft are the thrust force of the engines and the force due to the wind. The vector diagram for these forces is shown. Which vector represents the resultant horizontal force acting on the aircraft due to these two forces?

• 
• 
• 
• 

The acceleration of free fall on a planet P is 1/6th of the acceleration of free fall on Earth. The mass of a body on planet P is 30 kg. What is its weight on planet P?

• 4.9N
• 49N
• 180N
• 290N

Which charge can be carried by a charge carrier?

• 1.1×10^-19C
• 4.0×10^-19C
• 4.8×10^-19C
• 9.1×10^-19C