9702_s17_qp_11
A paper of Physics, 9702
Questions:
40
Year:
2017
Paper:
1
Variant:
1
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7
The mass of a rocket-propelled truck is approximately equal to the mass of the fuel in its tank. The fuel is ignited and the truck is propelled along horizontal tracks by a constant force. The effect of air resistance is negligible. During a test run the fuel is consumed at a constant rate. Which statement describes the acceleration of the truck during the test run?
2. Kinematics  →  2.1. Equations of motion
12. Motion in a circle  →  12.2. Centripetal acceleration
3. Dynamics  →  3.1. Momentum and Newton’s laws of motion
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31
The diagram shows two parallel horizontal metal plates. The top plate is positively charged and the bottom plate is earthed. + liquid drop plates A small charged liquid drop, midway between the plates, is held in equilibrium by the combination of its weight and the electric force acting on it. The acceleration of free fall is g and the electric field strength is E. What is the polarity of the charge on the drop, and the ratio of charge to mass of the drop?
18. Electric fields  →  18.2. Uniform electric fields
18. Electric fields  →  18.5. Electric potential
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36
A computer is used to detect the change of position of a switch. To detect the change of position, the computer requires a potential difference (p.d.) of 0 V to its input at one switch position and a p.d. of between 5 V and 7 V at the other switch position. For each of the circuits, assume the battery has negligible internal resistance. Which circuit provides an input voltage to the computer that enables it to detect the change of position of the switch?
10. D.C. circuits  →  10.1. Practical circuits
10. D.C. circuits  →  10.2. Kirchhoff’s laws
10. D.C. circuits  →  10.3. Potential dividers
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