1
WB JEE 2008
MCQ (Single Correct Answer)
+1
-0.25

Force required to move a mass of 1 kg at rest on a horizontal rough plane ($$\mu$$ = 0.1 and g = 9.8 m/s2) is

A
0.98 N
B
0.49 N
C
9.8 N
D
4.9 N
2
WB JEE 2008
MCQ (Single Correct Answer)
+1
-0.25

A rocket of mass 100 kg burns 0.1 kg of fuel per sec. If the velocity of exhaust gas is 1 km/sec, then it lifts with an acceleration of

A
1000 ms$$-$$2
B
100 ms$$-$$2
C
10 ms$$-$$2
D
1 ms$$-$$2
3
WB JEE 2008
MCQ (Single Correct Answer)
+1
-0.25

A bullet emerges from a barrel of length 1.2 m with a speed of 640 ms$$-$$1. Assuming constant acceleration, the approximate time that it spends in the barrel after the gun is fired is

A
4 ms
B
40 ms
C
400 $$\mu$$s
D
1 s
4
WB JEE 2023
MCQ (Single Correct Answer)
+1
-0.25
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A body of mass 2 kg moves in a horizontal circular path of radius 5 m. At an instant, its speed is 2$$\sqrt5$$ m/s and is increasing at the rate of 3 m/s$$^2$$. The magnitude of force acting on the body at that instant is,

A
6 N
B
8 N
C
14 N
D
10 N
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