Question

A rocket is going upwards with accelerated motion. A
man sitting in it feels his weight increased 5 times his
own weight. If the mass of the rocket including that of
the man is 1.0 x 10*4 kg, how much force is being applied
by rocket engine? (Take g = 10 m s-2)
(a) 5 x 10*4 N
(b) 5x 10*5 N
(c) 5x10*8 N
(d) 2 x 10*4 N

Answer 1

Answer:

b)5 x 10*5 N

Explanation:

Hope you understand the answer.

Answer 2

Given

● Man sitting in rocket feels his weight increasing 5 times his own weight while going upwards.

● Mass of rocket including the weight of man is 1 × 10⁴ kg.

● g (Gravitational acceleration) = 10 m/s²

To find

● Force applied by rocket engine.

Solution

As the man feels his weight increasing 5 times his own weight, that means his body's acceleration is increasing by 5 times.

Here we have to use gravitational acceleration(g) as acceleration as the man is going upwards in rocket.

Body's acceleration :

⇒ Acceleration = 5 × g

⇒ Acceleration = 5 × 10

⇒ Acceleration = 50 m/s²

There is given mass of rocket including man = 1 × 10⁴ kg.

Now finding force applied by rocket engine

Using Newton's 2nd law of motion :

⇒ F = ma

⇒ F = 1 × 10⁴ × 50

⇒ F = 50 × 10⁴

⇒ F = 5 × 10⁵ N

Therefore,

Force applied by rocket engine = 5 × 10⁵ N Option (b)✔