Ahigh-speed drill rotating counterclockwise takes 2.5 s to speed up to 2400 rpm. (a) what is the drill’s angular acceleration?
(b) how many revolutions does it make as it reaches top speed?

(a) Angular acceleration will be

(b) 50 revolution

Explanation:

We have given time t = 2.5 sec

Initial speed of the drill

Speed after 2.5 sec

From first equation of motion we know that

(b) From second equation of motion we know that

true is the correct answer

hope i

energy stored in the capacitor= 9.72 x 10⁻⁴ j

explanation:

the energy stored in the capacitor is given by

e= 1/2 c v²

e= energy stored

c= capacitance= 1.5 µc= 1.5 x 10⁻⁶f

v= potential difference=36 v

so energy stored= e= 1/2 (1.5 x 10⁻⁶) (36)²

energy stored= 9.72 x 10⁻⁴j