Question

A powered winch is used to pull a sailboat to shore. The winch uses a 900 W motor.

If the motor is used for 30 s, how much work does it do? (Power: P = W/t)

a. 0.03 J
b. 30 J
c. 960 J
d. 27,000 J

Answer 1

Answer:

D

Explanation:

P= 900W

t = 30s

W=P×t

w= 900×30

W= 27000J

Answer 2

Answer:

Concept:

Work, Power, and Time

Explanation:

Work is defined by science as a task completed when a force works on a body to cause displacement. To put it another way, work isn't finished until and unless force is utilized to move an item. The Joule, abbreviated as J, is the standard unit of work (J). One Joule of work done is equal to the amount of work done when one Newton of force causes a displacement of one meter in the direction of the applied force.

Total Work Done (W) = Power (P) multiplied by Time (T)

$\mathrm{P}=900 \mathrm{~W} \mathrm{t}=30 \mathrm{~s} \\ \mathrm{~W}=\mathrm{P} \times \mathrm{t} \\ \mathrm{w}=900 \times 30 \\ \\\mathrm{~W}=27000 \mathrm{~J}$

So the work done is 27000 J which is option d.

#SPJ2