At any instant of time $t$, the displacement of any particle is given by $2 t-1$ ($SI$ unit) under the influence of force of $5 \mathrm{~N}$. The value of instantaneous power is (in SI unit):
- A$5$
- B$7$
- C$6$
- ✓$10$
Answer: D.
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5.work,energy,power and collision question types
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5.work,energy,power and collision questions
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Two bodies $A$ and $B$ of same mass undergo completely inelastic one dimensional collision. The body $A$ moves with velocity $v_1$ while body $B$ is at rest before collision. The velocity of the system after collision is $v_2$. The ratio $v_1: v_2$ is
- ✓$2: 1$
- B$4: 1$
- C$1: 4$
- D$1: 2$
Answer: A.
View full solution →The potential energy of a long spring when stretched by $2\,cm$ is $U$. If the spring is stretched by $8\,cm$, potential energy stored in it will be $.......\,U$
- ✓$16$
- B$2$
- C$4$
- D$8$
Answer: A.
View full solution →An electric lift with a maximum load of $2000\,kg$ (lift+ passengers) is moving up with a constant speed of $1.5\,ms ^{-1}$. The frictional force opposing the motion is $3000\,N$. The minimum power delivered by the motor to the lift in watts is: $\left(g=10\,ms^{-2}\right)$
- A$20000$
- ✓$34500$
- C$23500$
- D$23000$
Answer: B.
View full solution →A gravitational field is present in a region and a mass is shifted from $A$ to $B$ through different paths as shown. If $W _1, W _2$ and $W _3$ represent the work done by the gravitational force along the respective paths, then
- ✓$W _1= W _2= W _3$
- B$W _1 > W _2 > W _3$
- C$W _1 > W _3 > W _2$
- D$W_1 < W_2 < W_3$
Answer: A.
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