Acar travels at a constant velocity of 20.0 meters/second for 15 seconds. what is the power of the car if the initial force applied to it was 95 newtons?
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Ответ:
Ответ:
The correct answer to the question is 1900 Joule.
CALCULATION:
As per the question, the velocity of the car v = 20.0 m/s.
The time taken by the car t = 15 seconds.
The initial force applied on the car F = 95 N.
We are asked to calculate the power of the car.
Let the displacement of the car is denoted as S.
Let the power of the car is P.
The power of a car is defined as the word done by the car per unit time.
Hence, the power P =![\frac{W}{t}](/tpl/images/0250/9820/6b85d.png)
=![\frac{\vec F.\vec S}{t}](/tpl/images/0250/9820/e4998.png)
=![\vec F.\frac{S}{t}](/tpl/images/0250/9820/1a9f2.png)
=![\vec F.\vec v](/tpl/images/0250/9820/49d8f.png)
=![Fvcos\theta](/tpl/images/0250/9820/002e0.png)
Here,
is the angle between force and velocity.
If
, then P = Fv.
Hence, the power of the car is calculated as -
P = 95 N × 20.0 m/s
= 1900 Joule.
Ответ:
By the Newtons Second Law:
F = ma
F = (47 kg)(15 m/s²)
F = 705 N