A car is driven by an engine that delivers constant power (except possibly at the initial instant). If it starts from rest, its displacement varies with time $$(t)$$ as:
1. $$t$$
2. $$\sqrt t$$
3. $$\frac{1}{\sqrt t}$$
4. $$t\sqrt t$$
Subtopic:  Power |
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An elevator can carry a maximum load of $$1800$$ kg (elevator + passengers) is moving up with a constant speed of $$2$$ m/s. The frictional force opposing the motion is $$4000$$ N. The minimum power delivered by the motor to the elevator is:
1. $$59000$$ W
2. $$44000$$ W
3. $$11000$$ W
4. $$22000$$ W

Subtopic:  Power |
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A particle moves with a velocity $$(5\hat i-3\hat j+6\hat k)$$ ms–1 horizontally under the action of constant force $$(10\hat i+10\hat j+20\hat k)$$ N. The instantaneous power supplied to the particle is:
1. $$200$$ W
2. zero
3. $$100$$ W
4. $$140$$ W
Subtopic:  Power |
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