Which of the following actions will improve the efficiency of the pulley system?
reducing the mass of the pulley
increasing the friction force between the string and the pulley
increasing the mass per unit length of the string of the pulley
increasing the mass of the pulley
Correct answer is A
No explanation has been provided for this answer.
12.0
10.0
3.6
1.8
Correct answer is C
M.A = \(\frac{Z \times V.R}{100} = \frac{60 \times 5}{100} = 3.6\)
60W
80W
100W
120W
Correct answer is B
p = \(\frac{mgh}{t} = \frac{120 \times 10 \times 2}{30} = 80W\)
parallel to the line of action of the force from a reference point
perpendicular to the line of action of the force from a reference point
on a line through the reference point
by the object
Correct answer is A
The quantity of work done (or energy converted) by a force, when the force moves, depends on two obvious factors:
- the distance moved (in the direction along which the force acts) and
- the magnitude (strength) of the force
0.280kg
0.400kg
0.613kg
0.800kg
Correct answer is D
m = \(\frac{0.7 \times 40}{35} = 0.8kg\)
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