Acceleration Due to Gravity

Q.

The SI unit of weight is ______

Q.

If the angular velocity of the earths spin is increased such that the bodies at the equator start floating, the duration of the day would be approximate.

1. $60$ minutes

2. does not change

3. $84$ minutes

4. $1200$ minutes

Q.

When can the weight of an object zero?

Q.

If $\rho$ is the density of the planet, the time period of near by satellite is given by

1. $\sqrt{\frac{4\pi }{3G\rho }}$

2. $\sqrt{\frac{4\pi }{G_P}}$

3. $\sqrt{\frac{3\pi }{G\rho }}$

4. $\sqrt{\frac{\pi }{G_P}}$

Q.

If the diameter of Mars is $6760\mathrm{km}$ and mass one-tenth that of the earth. The diameter of the earth is $12742\mathrm{km}$. If acceleration due to gravity on earth is $9.8m{s}^{-2}$, the acceleration due to gravity on Mars is

1. $34.8m{s}^{-2}$

2. $2.48m{s}^{-2}$

3. $3.48m{s}^{-2}$

4. $28.4m{s}^{-2}$

Q.

Weight of an object has S.I. unit of :

Q.

If a planet existed where mass and radius both were half of those of earth what will be the value of acceleration due to gravity on the surface as compared to what is on the earths surface?

Q.

Consider earth to be a uniform sphere of radius, $6.4\times {10}^6$$m$ and its density is $5500kg{m}^{-3}$. Find the value of acceleration due to gravity on its surface.

Q.

A body has a mass of 25 kg.Calculate its weight in SI system of units.

Q.

Define the term “weight of a body”.

Q.

Derive a relation for acceleration due to gravity. How their values vary with?
(i) Mass of the planet
(ii) Size of the planet

Q.

What is the SI unit of weight?

Q. The speed of a ball changes from $8m{s}^{-1}$ to $6m{s}^{-1}$ in 0.5 s on hitting a surface and bouncing back. Find the rate of change of speed of the ball?

1. - 6 ${\text{ms}}^{-2}$
2. + 4 ${\text{ms}}^{-2}$
3. + 6 ${\text{ms}}^{-2}$
4. - 4 ${\text{ms}}^{-2}$

Q.

A planet reduces its radius by $1\%$ keeping its mass unchanged. How does its acceleration due to gravity change?

Q. The speed of a ball changes from $8m{s}^{-1}$ to $6m{s}^{-1}$ in 0.5 s on hitting a surface and bouncing back. Find the rate of change of speed of the ball?

1. + 6 ${\text{ms}}^{-2}$
2. - 6 ${\text{ms}}^{-2}$
3. + 4 ${\text{ms}}^{-2}$
4. - 4 ${\text{ms}}^{-2}$

Q. The mass of a lift is 2000 kg. When the tension in the supporting cable is 28000 N, then its acceleration is

1. $30$ ${ms}^{-2}$ downwards
2. $4$ ${ms}^{-2}$ upwards
3. $4$ ${ms}^{-2}$ downwards
4. $14$ ${ms}^{-2}$ upwards

Q.

State the two things on which weight depends upon

Q. The velocity of a freely falling body, starting at rest and after one second is roughly equal to ___.

1. $10m{s}^{-1}$
2. $98m{s}^{-1}$
3. $100m{s}^{-1}$
4. $15m{s}^{-1}$

Q. The masses of two planets are in the ratio 1:2. Their radii are in the ratio 1:2. The acceleration due to gravity on the planets are in the ratio:

1. 2:1
2. 3:5
3. 5:3
4. 1:2

Q.

What do you understand by the term weight?

Q. The speed of a ball changes from $8m{s}^{-1}$ to $6m{s}^{-1}$ in 0.5 s on hitting a surface and bouncing back. Find the rate of change of speed of the ball?

1. - 6 ${\text{ms}}^{-2}$
2. + 6 ${\text{ms}}^{-2}$
3. - 4 ${\text{ms}}^{-2}$
4. + 4 ${\text{ms}}^{-2}$

Q. The speed of a ball changes from $8m{s}^{-1}$ to $6m{s}^{-1}$ in 0.5 s on hitting a surface and bouncing back. Find the rate of change of speed of the ball?

1. + 6 ${\text{ms}}^{-2}$
2. + 4 ${\text{ms}}^{-2}$
3. - 4 ${\text{ms}}^{-2}$
4. - 6 ${\text{ms}}^{-2}$

Q.

The unit of weight is___.