Question

kinetic energy of an object of mass 2kg moving with a speed of 3m/s and the potential energy of an object of mass 500g at a height of 20m area respectively (acceleration due to gravity is 10m/s^2)

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Answer 1

Explanation:

Answer:

5 π / 3 rad / sec²

Explanation:

Given :

ω = 500 rpm

ω in term of rad / sec

= > ω = 500 × 2 π / 60 rad / sec

= > ω = 50 π / 3 rad / sec

Time t = 10 sec

We have to find angular acceleration α :

We know :

α = ω / t

Putting value here we get :

= > α = ( 50 π / 3 ) / 10 rad /sec²

= > α = 5 π / 3 rad / sec²

Hence we get required answer!

Answer 2

Answer:

K.E. = 9 J

P.E. = 100 J

Explanation:

Given :

Mass m = 2 kg

Velocity v = 3 m / sec

Now kinetic energy is given as :

= > K.E. = 1 / 2 m v²

= > K.E. = 1 / 2 × 2 × 3² J

= > K.E. = 9 J

Now :

Mass m' =500 g = 0.5 kg

Height h = 20 m

Acceleration due to gravity g = 10 m / sec²

We know potential energy is given as :

= > P.E. = m g h

= > P.E. = 0.5 × 10 × 20 J

= > P.E. = 100 J

Hence we get required answer!