What is the mass of an object whose weight is 49N? (Given g = 9.8 ms–2).

08/10/2023 WNA24 131 Views 0 Comments

What is the mass of an object whose weight is 49N? (Given g = 9.8 ms–2).

Ans: – We know, F=ma;

Where m=mass=? a=g=9.8 m/s^2. And F=force=49N.

So, 49=9.8×m.

Or, m=5kg.

A stone is dropped from the top of a tower 45 m high. What is its velocitywhen it hits the ground? (Given g = 10 ms–2).

Ans: – As, v^2 = u^2 + 2gh,

Where v=final velocity, u=initial velocity=0, g=10.

So, v^2 = 0 + 2×10×45;

Or, v=30.

A body weighs 3.5 N in air and 2 N in water. How much buoyant force acts on the body?

Ans: – The buoyant force= weight in air – weigh tin water,

Or, The buoyant force= 3.5 – 2=1.5N.

A body is immersed in a liquid. If the liquid displaced by the body weighs 1 N then what is the buoyant force acting on the body?

Ans: – We all know that the buoyancy force of an object is known as the amount of liquid displaced by uppers thrust which is 1N.

Buoyant force= liquid displaced by 1N force.