1
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
2
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
3
WB JEE 2025
MCQ (Single Correct Answer)
+1
-0.25
Change Language

The minimum force required to start pushing a body up a rough (having co-efficient of friction $\mu$ ) inclined plane is $\vec{F}_1$ while the minimum force needed to prevent it from sliding is $\overrightarrow{F_2}$. If the inclined plane makes an angle $\theta$ with the horizontal such that $\tan \theta=2 \mu$, then the ratio $F_1 / F_2$ is

A
4
B
1
C
2
D
3
4
WB JEE 2025
MCQ (Single Correct Answer)
+1
-0.25
Change Language

A force $\vec{F}=a \hat{i}+b \hat{j}+c \hat{k}$ is acting on a body of mass $m$. The body was initially at rest at the origin. The co-ordinates of the body after time ' $t$ ' will be

A
$\frac{a t^2}{2 m}, \frac{b t^2}{2m}, \frac{c t^2}{2 m}$
B
$\frac{a t^2}{2 m}, \frac{b t^2}{m}, \frac{c t^2}{2 m}$
C
$\frac{a t^2}{m}, \frac{b t^2}{2 m}, \frac{c t^2}{2 m}$
D
$\frac{a t^2}{2 m}, \frac{b t^2}{2 m}, \frac{c t^2}{m}$
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