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JAMB Physics Past Questions & Answers - Page 257

1,281.

When taking a penalty kick, a footballer applies a force of 30.0N for a period of 0.05s. if the mass of the ball is 0.075kg, calculate the speed with which the ball moves off.

4.50ms^-1

11.25ms^-1

20.00ms^-1

45.00ms^-1

View answer & explanation

Correct answer is C

F = $\frac{m(v - u)}{T}$

30 = $\frac{0.075(v - 0)}{0.05}$

v = 20ms-1

1,282.

Which of the following quantities are scalars?

i. Electrical potential
ii. Torque
iii. Momentum
iv. Kinetic energy

ii and iii only

i and ii only

iii and iv only

i and iv only

View answer & explanation

Correct answer is D

No explanation has been provided for this answer.

1,283.

Two forces whose resultant is 100N, are at right angle to each other. If one of them makes an angle 30^o with the resultant, determine its magnitude.

8.66N

50.0N

57.7N

86.6N

View answer & explanation

Correct answer is D

COS 30^o = $\frac{F_1}{100}$

F₁ = 86.6N

1,284.

A lorry travels 10km northwards, 4km eastwards, 6km southwards, 4km westwards to arrive at a point T. What is the total displacement?

6km south

4km north

6km north

4km east

View answer & explanation

Correct answer is B

No explanation has been provided for this answer.

1,285.

Which of the following are the correct SI units of the quantities indicated?

i.N(Force)
ii. N/m (Torque)
iii. watt(Power)
iv. kgms-2(Momentum)

i and ii only

i, ii and iii only

i, ii, and iv only

i and iii only

View answer & explanation

Correct answer is D

Quantities unit

Force Newton

Torque Newton-metre

Power Watt

Momentum Kilogram-metre per secs

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