Page 54 - SP015 Past Years PSPM Chapter 1 -5 Ver.2020

PHYSICS PSPM SEM 1 1999 - 2017

PSPM 2006/2007 SF017/2 No. 2

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37. A motorcycle overtakes a slow moving lorry by speeding up from 16 m s to 18 m s
in 2 s. If the total mass of the rider and the motorcycle is 150 kg, calculate the required
power. [3 m]

UPS 2007/2008 SF017 No. 4(a)(ii), (b)
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38. (a) Show that P  F  v where P, F , and v represent power, force, and velocity
respectively. [2 m]

(b) A 650 kg lift starts from rest. It moves upward for 3.00 s with a constant
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acceleration until it reaches its final speed of 1.75 m s .
(i) Calculate the force exerted by the lift motor. [3 m]
(ii) Determine the instantaneous power in horse-power (hp) of the lift motor at
t = 3.00 s. (Given: 1 hp = 746 W) [3 m]

UPS 2009/2010 SF017 No. 4(a)

39. u

20

FIGURE 5.18

A 2.6 kg block slides down a rough inclined plane of angle 20 with the horizontal at a
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constant speed, v = 1.5 m s as shown in FIGURE 5.18.
(a) Sketch and label the forces acting on the block. [2 m]
(b) Calculate the rate of work done by the frictional force on the block. [4 m]

PSPM 2009/2010 SF017/2 No. 2(b) Edited

40. A particle undergoes displacement, s when acted by a force, F. Work done by the force
is 13 J. Calculate the average power if the force acts for 5 seconds. [2 m]

UPS 2011/2012 SF016 No. 4(a)(ii)

41. A jet engine develops a horizontal thrust of 30 kN. If the jet is flying at a velocity of
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300 m s , calculate the horsepower developed. (1 hp = 746 W) [3 m]

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