$A$ truck starts from rest and rolls down a hill with a constant acceleration. It travels a distance of $400 \, m$ in $20 \, s$. Find the force (in $N$) acting on it if its mass is $7 \, \text{tonnes}$ $(1 \, \text{tonne} = 1000 \, kg)$.
- A$14000$
- B$41000$
- C$16000$
- D$11000$
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$A$ stone of $1\, kg$ is thrown with a velocity of $20\, m\ s^{-1}$ across the frozen surface of a lake and comes to rest after travelling a distance of $50\, m$. What is the force of friction (in $N$) between the stone and the ice?
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View Solution$A$ hammer of mass $500 \,g$,moving at $50 \,m/s$,strikes a nail. The nail stops the hammer in a very short time of $0.01 \,s$. What is the force (in $N$) of the nail on the hammer?
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View SolutionWhen a carpet is beaten with a stick,dust comes out of it. Explain.
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View SolutionThe following is the distance-time table of an object in motion:
Time in seconds Distance in metres $0$ $0$ $1$ $1$ $2$ $8$ $3$ $27$ $4$ $64$ $5$ $125$ $6$ $216$ $7$ $343$
$(a)$ What conclusion can you draw about the acceleration? Is it constant, increasing, decreasing, or zero?
$(b)$ What do you infer about the forces acting on the object?
| Time in seconds | Distance in metres |
| $0$ | $0$ |
| $1$ | $1$ |
| $2$ | $8$ |
| $3$ | $27$ |
| $4$ | $64$ |
| $5$ | $125$ |
| $6$ | $216$ |
| $7$ | $343$ |
$(a)$ What conclusion can you draw about the acceleration? Is it constant, increasing, decreasing, or zero?
$(b)$ What do you infer about the forces acting on the object?
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View Solution$A$ $8000 \,kg$ engine pulls a train of $5$ wagons,each of $2000 \,kg$,along a horizontal track. If the engine exerts a force of $40000 \,N$ and the track offers a friction force of $5000 \,N$,then calculate the acceleration (in $m/s^2$) of the train.
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