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0625/02/SP/23© UCLES 2020 [Turn over
11 A man climbs a ladder.
Which quantities can be used to calculate the useful power of the man?
A the weight of the man and the time taken only
B the weight of the man and the vertical distance moved only
C the work done by the man and the time taken only
D the work done by the man and the vertical distance moved only
12 A student uses her thumb to push a drawing pin (thumb tack) into a notice board.
The pin goes into the board but does not penetrate her thumb.
Which statement explains this?
A The force exerted by the pin on her thumb is greater than the force exerted by the pin on the
notice board.
B The force exerted by the pin on the notice board is greater than the force exerted by the pin
on her thumb.
C The pressure of the pin on her thumb is greater than the pressure of the pin on the notice
board.
D The pressure of the pin on the notice board is greater than the pressure of the pin on her
thumb.
13 A submarine is a boat that can travel below the surface of the sea.
A submarine is 20 m below the surface of the sea. The pressure due to the sea water at this
depth is P.
On another day, the submarine is 26 m below the surface of fresh water.
The density of sea water is 1.3 times the density of fresh water.
What is the pressure due to the fresh water at a depth of 26 m?
A
B P C 1.3 P D 1.7 P
14 When particles of a gas collide with a wall of a container, the wall experiences a pressure.
What is the cause of this pressure?
A the change in energy of the particles
B the change in momentum of the particles
C the change in power of the particles
D the change in speed of the particles