WAEC Physics Past Questions & Answers - Page 153

761.

Uniform speed occurs when there is equal change of

A.

distance in equal times

B.

displacement in equal times

C.

velocity in equal times

D.

acceleration in equal times

Correct answer is A

No explanation has been provided for this answer.

763.

A body is rotating in a horizontal circle of radius 2.5m with an angular speed of 5 rad s-1. Calculate the magnitude of the radial acceleration of the body

A.

62.50ms-2

B.

31.25ms-2

C.

12.50ms-2

D.

10.00ms-2

Correct answer is C

\(\alpha = \frac{W_2 - W_1}{t} = \frac{5}{1} = 5 rad\)/s2

9 = \(\alpha\)r

= 5 x 2.5 = 12.50m\s2

764.

An object is said to undergo oscillatory motion when it moves

A.

in an erratic manner

B.

to and fro about a fixed point

C.

in a circular path

D.

along a continuous path from the starting point

Correct answer is B

No explanation has been provided for this answer.

765.

A solid body will float in a liquid if its

A.

density is less than that of a liquid

B.

mass is equal to that of the liquid

C.

density is greater than that of the liquid

D.

mass is less than that of the liquid

Correct answer is A

No explanation has been provided for this answer.