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JAMB Physics Past Questions & Answers - Page 129

641.

A 50kg block is dropped from a point 10m above as shown in the fig above. if the force constant of the spring is 4.0 x 10 $^4$ Nm-1, find the maximum compression of the spring

[g = 10ms-2]

1.25m

0.50m

0.25m

0.05m

View answer & explanation

Correct answer is B

P.E $_{mgh}$ = $\frac{1}{2}$ * k * x $^2$

mgh = $\frac{1}{2}$ * k * x $^2$

50 * 10 * 10 = $\frac{1}{2}$ * 4 * 10 $^4$ * x $^2$

→ x $^2$ = $\frac{5000 * 2}{4 * 10^4}$

→ x = √[0.25]

: x = 0.50m

642.

the fig above shows two connected bodies of masses M1 and M2 in equilibrium under gravity. The tension in the upper string is

(m1-m2)g

m1g

m2g

(m1+m2)g

View answer & explanation

Correct answer is B

No explanation has been provided for this answer.

643.

The velocity time graph above describes the motion of a particle between two points P and Q. What is the distance between P and Q?

17.0m

18.0m

22.5m

30.0m

View answer & explanation

Correct answer is B

distance = area under the graph.

= $\frac{1}{2}\times 1 \times 4 ) + \frac{1}{2} \times (4+6)\times 1) + (6 \times 1.5) + (\frac{1}{2}\times(2 + 6)\times 0.5)$

644.

fig 1 is a graph of force against extension for a spiral spring, the force constant of the spring is given by the

slope of the linear portion of the graph

length of the linear portion of the graph

area under the linear portion of the graph

area under the entire graph

View answer & explanation

Correct answer is A

No explanation has been provided for this answer.

645.

A uniform meter rule QR is balanced on a knife edge which is 55cm from R, when a mass of 10g is hung at P as shown above, the mass of the meter rule is

550g

350g

70g

35g

View answer & explanation

Correct answer is C

No explanation has been provided for this answer.

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