Question
A horizontal metal bar PQ of length 50.0 cm is hinged at end P. The diagram shows the metal bar viewed from above.
Two forces of 16.0 N and 5.0 N are in the horizontal plane and act on end Q, as shown.
What is the resultant moment about P due to the two forces?
A 1.5 N m B 4.4 N m C 6.5 N m D 9.4 N m
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Question
A shelf XY is 0.40 m long and is attached to a wall at end X. It is kept horizontal by a wire attached to Y and to the wall, as shown.
The tension force in the wire is 15 N at an angle of 30o to the horizontal.
What is the moment of this force about point X?
A 3.0 N m B 5.2 N m C 6.9 N m D 12N m
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Question
A charged oil drop is held stationary between two charged parallel plates.
Which forces act on the oil drop?
A both electric and gravitational
B electric only
C gravitational only
D neither electric nor gravitational
Answer/Explanation
Question
A particle with mass moves in a horizontal straight line through a uniform electric field in a vacuum. The electric field is vertical.
There is a significant gravitational effect on the motion of the particle.
What could be the direction of the electric field and the sign of the charge, if any, on the particle?
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Question
Two parallel forces, each of magnitude F, act on a rod of length 5d.
Which diagram shows the positions of the two forces that will produce the largest torque on the rod?
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