First slide

Power

Question

A body is initially at rest. It under goes one-dimension motion with constant acceleration. The power delivered to it at time t is proportional to

Moderate

A

$t^{\frac{1}{2}}$
B

$t$
C

$t^{\frac{3}{2}}$
D

$t^{2}$

Solution

$p o w e r = f o r c e . v e l o c i t y - - - (1) b u t a c c e l e r a t i o n = \frac{v e l o c i t y}{t i m e} \Rightarrow a t = v e l o c i t y - - - (2) s u b s t i t u t e e q n (2) i n (1) p o w e r P = F (a t) g i v e n a c c e l e r a t i o n i s c o n s \tan t, h e n c e f o r c e w i l l b e c o n s \tan t \Rightarrow p o w e r α t i m e \Rightarrow P α t$

Get Instant Solutions

When in doubt download our app. Now available Google Play Store- Doubts App

Recieve an sms with download link

Doubts App

OR

SCAN ME

Doubts App

Doubts App