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Lunna [17]
4 years ago
7

You raise a bucket of water from the bottom of a deep well. if your power output is 100 w, and the mass of the bucket and the wa

ter in it is 3.50 kg, with what speed can you raise the bucket? ignore the weight of the rope.
Physics
1 answer:
NikAS [45]4 years ago
5 0
Recall
power = Force × speed
100 = 3.5×10 × V
V = 100÷35 = 2.86 ms-¹
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The engine in an imaginary sports car can provide constant power to the wheels over a range of speeds from 0 to 70 miles per hou
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t=5.3687\ s  is the time taken by the car to accelerate the desired range of the speed from zero at full power.

Explanation:

Given:

Range of speed during which constant power is supplied to the wheels by the car is 0\ mph\ to\ 70\ mph.

  • Initial velocity of the car, v_i=0\ mph
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  • Time taken to accelerate form zero to 32 mph at full power, t=1.2\ s
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Now the acceleration of the car:

a=\frac{v_f-v_i}{t}

a=\frac{14.3052-0}{1.2}

a=11.921\ m.s^{-1}

Now using the equation of motion:

u_f=u_i+a.t

64=0+11.921\times t

t=5.3687\ s is the time taken by the car to accelerate the desired range of the speed from zero at full power.

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