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WAEC Physics Past Questions & Answers - Page 161

801.

Which of the following source of energy is renewable?

sun

petroleum

coal

uranium

View answer & explanation

Correct answer is A

No explanation has been provided for this answer.

802.

Which of the following quantities has the same unit as energy?

power

work

force

momentum

View answer & explanation

Correct answer is B

No explanation has been provided for this answer.

803.

Fuel was consumed at a steady rate of 5.0 x 10^-2kg per second in a rocket engine and ejected as a gas with a speed of 4 x 10³ms^-1. Determine the thrust on the rocket

20N

80N

200N

800N

View answer & explanation

Correct answer is C

F = ma = $\frac{mv}{t} = \frac{5 \times 10^{-2} \times 4 \times 10^{3}}{1}$

= 200N

804.

A body of mass 5kg moving with a velocity of 10ms^-1 collides with a stationary body of mass 6kg. If the two bodies stick together and move in the same direction after their collision, calculate their common velocity

4.55ms^-1

12.00ms^-1

30.00ms^-1

50.00ms^-1

View answer & explanation

Correct answer is A

$M_1V_1 + M_2U_2 = V(M_1 + M_2)$

5 x 10 + 6 x 0 = V(5 + 6)

V = $\frac{50}{11} = 4.55$ m/s

805.

Which of the following about an object performing simple harmonic motion is correct? Its acceleration

is maximum at the extreme ends

is constant and directed towards a fixed point

is zero when it is displayed from the equilibrium position

varies linearly with the displacement from a fixed point and is directed towards the fixed point

View answer & explanation

Correct answer is B

No explanation has been provided for this answer.

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