Question 2 :
Assertion: An object may fall with a constant velocity. Reason: This happens when acceleration of the object is equal to acceleration due to gravity

Question 3 :
On the earth surface, 'g' is a vector and its direction is oriented towards the centre of the

Question 4 :
A woman weighs 500 N earth. With how much forces her body pulling up on the earth?

Question 7 :
The value of g on the moon is $$\dfrac {1}{6}th$$ that on earth. A body weighing 60 kg on the earth has weight on the moon equal to?

Question 8 :
The acceleration of free fall for object moving near the surface of Earth is:

Question 9 :
Fill in the blank.When a solid is partially or wholly immersed in a fluid it experiences an apparent loss in _____.

Question 10 :
Assertion: To float; a body must displace liquidwhose weight is equal to the actual weight.<br>Reason: The body will experience no net downwardforce in that case.

Question 11 :
If density of the earth is doubled keeping its radius constant, then acceleration due to gravity (present value $$9.8 &#160;m/s^2$$) will be:

Question 12 :
A beaker containing water is placed on the platform of a spring balance. The balance reads $$1.5\ kg$$. A stone of mass $$0.5\ kg$$ and density $${10}^{4}\ kg/{m}^{3}$$ is immersed in water without touching the walls of the beaker. What will be the balance reading now?

Question 13 :
An iron ball is weighed in air and then in water by a spring balance

Question 14 :
A student determined to test the law of gravity for himself walks off a skyscraper $$320m$$ high with a stopwatch in hand and starts his free fall (zero initial velocity). $$5$$ seconds later, superman arrives at the scene and dives off the roof to save the student. what must be superman's initial velocity in order that he catches the student just before reaching the ground? [assume that superman's acceleration is that of a free-falling body, $$g = 10m/s^2$$]

Question 16 :
For a given length of a pendulum, the time period is maximum<br>

Question 17 :
Compare the acceleration due to gravity on the surface of a planet, whose mass and diameter are double that of the earth, with the acceleration due to gravity on the surface of the earth.

Question 18 :
If value of acceleration due to gravity changes from one place to another, which of the following force will&#160;undergo a change?

Question 19 :
The acceleration of free fall on Pluto is $$0.66m s^{-2}$$. An object weighs $$6.0$$N on Earth. What would this object weigh on Pluto?

Question 20 :
write the true or false for each statement<br>A body experiences the same buoyant force while floats or sinks in water or alcohol.<br>

Question 21 :
A body of weight $$1N$$ is placed at the surface of the earth, which is assumed to be a perfect sphere of radius $$6400 km $$ . It is taken to a height of $$600 km $$ , the weight of the body, in $$N$$ , would be :

Question 22 :
Find the value of $$\theta $$ such that the acceleration of $$A$$ is $$ g/6 $$ downward along the incline plane. (All surfaces are smooth)

Question 23 :
A boy carries a fish in one hand and a bucket (not full) of water in the other hand. If he places thefish in the bucket, the weight now carried by him (assume that water does not spill):

Question 24 :
A $$60kg$$ man is inside a lift which is moving up with an acceleration of $$2.45\ {ms}^{-2}$$. The apparent percentage change in his weight is: