Question

If it takes 50 seconds to lift 10 Newtons of books to a height of 7 meters, calculate the power required.

Answer 1

$\LARGE{ \underline{\underline{ \red{ \sf{Required \: answer:}}}}}$

GiveN:

• Force applied = 10 N
• Height of upliftment = 7 m
• Time taken = 50 s

To FinD:

• Calculate the power required?

Step-wise-Step Explanation:

Work is given by the product of force applied and the displacement of the body. Here, force is the weight of the body(mg). So, W = F × s.

Plugging the given values:

⇒ W = 10 N × 7 m

⇒ W = 70 Nm

⇒ W = 70 J (The unit can be written as J)

And we know that power is the rate of work done. So, P = W/t. Plugging the given values of W and t.

⇒ P = 70J /50s

⇒ P = 1.4 J/s

⇒ P = 1.4 watt (The unit can be written as Watt)

Thus, the required the power required to lift the books to that height is 1.4 watt.

Answer 2

Answer:

$\huge \bf \: required \: answer$

• Time taken - 50 second
• Weight - 10 newton
• Height - 7 m
• Power required - ?

As we know that W = F × s

W = 10 × 7

W = 70 Joule

Now we know that P = W / T

$p \: = \frac{70}{50}$

$p \: = \frac{7}{5}$

Power required = 1.4 Watt