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JAMB Physics Past Questions & Answers - Page 250

1,246.

A constant force of 40N acting on a body initially at rest gives an acceleration of 0.1ms^-2 for 4s. Calculate the work done by the force

8JQ

10J

32J

160J

View answer & explanation

Correct answer is C

X = ut + $\frac{1}{2}$ at²

= (0 x 4) + ( $\frac{1}{2}$ x 0.1 x 4 x 4)

= 0.8m

workdone = force x distance

= 40 x 0.8

= 32J

1,247.

An elevator of mass 4800kg is supported by a cable which can safely withstand a maximum tension of 60 000N. The maximum upward acceleration the elevator can have is

2.5ms^-2

5.0ms^-2

7.5ms^-2

10.0ms^-2

View answer & explanation

Correct answer is A

a = $\frac{F}{m}$

= $\frac{60000 -(4800 \times10)}{4800}$

= 2.5ms^-2

1,248.

A man walks 8km north and then 5km in a direction 60^o east of north. Find the distance from his starting point

11.36km

12.36km

13.00km

14.36km

View answer & explanation

Correct answer is A

R = $\sqrt {5^2 + 8^2 - 2 \times 5 \times 8 \times cos 120^o}$

R = $\sqrt{129}$

= 11.36km

1,249.

A jet engine develops a thrust of 270Ns when the velocity of the exhaust gases relative to the engine is 300ms^-1. What is the mass of the material ejected per second?

81.00kg

9.00kg

0.90kg

0.09kg

View answer & explanation

Correct answer is C

Thrust = force x time

thrust = $\frac{m(v - u)}{t}$ x $\frac{t}{1}$

270 = m(300 - 0)

m = 0.90kg

1,250.

Which of the following units is equivalent to kgms^-1?

Ns^-1

Nms^-1

Js^-1

View answer & explanation

Correct answer is C

kgms^-1 = $\frac{mass}{distance}$

since, F = ma = kgms^-1 = N

kgms^-1 = Ns

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