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JAMB Physics Past Questions & Answers - Page 234

1,166.

Two masses 40g and 60g respectively, are attached firmly to the ends of the light meter rule. The center of gravity of the system is

at the mid-point of the meter rule

40cm from the lighter mass

40cm from the heavier mass

60cm from the heavier mass

indeterninate because the meter-rule is light

View answer & explanation

Correct answer is C

No explanation has been provided for this answer.

1,167.

Which of the following is NOT a force?

Friction

Tension

Upthrust

Weight

Impulse

View answer & explanation

Correct answer is E

No explanation has been provided for this answer.

1,168.

A metal block of mass 5kg lies on a rough horizontal platform. If a horizontal force of 8N applied to the block through its center of mass just slides the block on the platform, then the coefficient of limiting friction between the block and platform is

0.16

0.63

0.80

1.60

2.00

View answer & explanation

Correct answer is A

F = $\mu$ R

= $\mu$ mg

8 = $\mu$ x 5 x 10

$\mu$ = 0.16

1,169.

A block of mass 2.04kg resting on a smooth horizontal plane is acted upon simultaneously by two-forces, 10N due North and 10N due East. The magnitude of the acceleration produced by the force on the block is

0.10ms^-2

7.07ms^-2

10.00ms^-2

14.10ms^-2

20.00ms^-2

View answer & explanation

Correct answer is B

R = $\sqrt {10^2 + 10^2}$

R = 14.14N

R = F = ma

14.14 = 2 x a

a = 7.07ms^-1

1,170.

If a car starts from rest and moves with a uniform acceleration of 10ms^-2 for ten seconds, the distance it covers in the last one second of its motion is

95m

100m

500m

905m

1000m

View answer & explanation

Correct answer is A

Distance in 105, using, x = ut + $\frac{1}{2}$ at²

x = (0 x 10) + ( $\frac{1}{2}$ x 10 x 10 x 10) = 500m

distance in 9s; x - (0 x 9) + ( $\frac{1}{2}$ x 10 x 9 x 9) = 405m

distance in last is = difference

= 500 - 405

= 95m

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