Physics Past Questions and Answers

The term torque means

A The moment
B The resultant of several forces acting on a body in equilibrum
C Two equal and oposite forces whose lines of action do not coincide
D Two coplaner forces at right angles to each other
E The equilibrant of two concurrent forces

Question 592:

A rectangular block of wood floats in water with two-thirds of its volume immersed. When placed in another liquid, it floats with half of its volume immersed. Calculate the relative density of the liquid

A 1.43
B 1.33
C 1.00
D 0.83
E 0.75

Question 593:

As the end Q of the plank is raised, the component of W, normal to plank, will

A Increase
B Decrease
C Remain the same
D Be slightly greater than W
E Be independent of w

Question 594:

If \(\theta\) is equal to \(\alpha\) at the time the box is just about to slide down the plank, the coefficient of static friction between the plank and box is

A Sin\(\alpha\)
B Cos\(\alpha\)
C Tan\(\alpha\)
D Sec\(\alpha\)
E Cot\(\alpha\)

Question 595:

I the box is pulled from P to Q, which of the following expresses the velocity ratio of the inclined plane?

A PR/PQ
B OR/PQ
C OR/PR
D PQ/PR
E PQ/QR