9702_w17_qp_11
A paper of Physics, 9702
Questions:
40
Year:
2017
Paper:
1
Variant:
1
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8
The three forces acting on a hot-air balloon that is moving vertically are its weight, the force due to air resistance and the upthrust force. The hot-air balloon descends vertically at constant speed. The force of air resistance on the balloon is F. Which weight of material must be released from the balloon so that it ascends vertically at the same constant speed?
3. Dynamics  →  3.1. Momentum and Newton’s laws of motion
6. Deformation of solids  →  6.1. Stress and strain
3. Dynamics  →  3.2. Non-uniform motion
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9
A car is moving at constant speed in a straight line with the engine providing a driving force equal to the resistive force F. When the engine is switched off, the car is brought to rest in a distance of 100 m by the resistive force. It may be assumed that F is constant during the deceleration. The process is then repeated for the same car with the same initial speed but with a constant resistive force of 0.800 F. How far will the car travel while decelerating?
3. Dynamics  →  3.2. Non-uniform motion
3. Dynamics  →  3.1. Momentum and Newton’s laws of motion
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14
The diagram shows a motorised vehicle for carrying one person. 400 mm 600 N 600 N direction of motion axle The vehicle has two wheels on one axle. The passenger stands on a platform between the wheels. The weight of the machine is 600 N. Its centre of mass is 200 mm in front of the axle. The wheel radius is 400 mm. When stationary, a passenger of weight 600 N stands with his centre of mass 200 mm behind the axle to balance the machine. The motor is now switched on to provide a horizontal force of 90 N at the ground to move the vehicle forwards. How far and in which direction must the passenger move his centre of mass to maintain balance?
3. Dynamics  →  3.1. Momentum and Newton’s laws of motion
4. Forces, density and pressure  →  4.1. Turning effects of forces
Open
23
A loudspeaker emits a sound wave into a tube initially full of water. tap loudspeaker tube water x y A tap at the bottom of the tube is opened so that water slowly leaves the tube. For some lengths of the air column in the tube, the sound heard is much louder. The first loud sound is heard when the air column in the tube has length x. The next time that a loud sound is heard is when the air column in the tube has length y. What is the wavelength of the sound wave from the loudspeaker?
7. Waves  →  7.1. Progressive waves
24. Medical physics  →  24.1. Production and use of ultrasound
8. Superposition  →  8.3. Interference
Open
31
A small charged sphere of mass 0.80 g hangs from a light thread inside a vertical uniform electric field of strength 2000 V m–1. The thread passes over two frictionless pulleys and a mass of 2.00 g hangs on the other end. + _ + _ + _ + _ + _ + _ 2.00 g mass pulleys electric field of 2000 V m–1 charged sphere of mass 0.80 g The sphere is in equilibrium. What is the charge on the sphere?
18. Electric fields  →  18.3. Electric force between point charges
13. Gravitational fields  →  13.2. Gravitational force between point masses
18. Electric fields  →  18.2. Uniform electric fields
Open