The volume of a 500 g sealed packet is 350 cm3 . Will the packet float or sink in water if the density of water is 1 g cm−3 ? What will be the mass of the water displaced by this packet? Open Answer »
The volume of 50 g of a substance is 20 cm3 . If the density of water is 1 g cm−3 , will the substance float or sink? Open Answer »
A ball thrown up vertically returns to the thrower after 6 s. Find (a) the velocity with which it was thrown up, (b) the maximum height it reaches, and (c) its position after 4 s. Open Answer »
A stone is allowed to fall from the top of a tower 100 m high and at the same time another stone is projected vertically upwards from the ground with a velocity of 25 m/s. Calculate when and where the two stones will meet. Open Answer »
Calculate the force of gravitation between the earth and the Sun, given that the mass of the earth = 6 × 10^24 kg and of the Sun = 2 × 10^30 kg. The average distance between the two is 1.5 × 10^11 m. Open Answer »
A stone is thrown vertically upward with an initial velocity of 40 m/s. Taking g =10 m/s2 , find the maximum height reached by the stone. What is the net displacement and the total distance covered by the stone? Open Answer »
A stone is released from the top of a tower of height 19.6 m. Calculate its final velocity just before touching the ground. Open Answer »
A ball is thrown vertically upwards with a velocity of 49 m/s. Calculate (i) the maximum height to which it rises. (ii) the total time it takes to return to the surface of the earth. Open Answer »
Gravitational force on the surface of the moon is only 1/6 as strong as gravitational force on the Earth. What is the weight in newtons of a 10 kg object on the moon and on the Earth? Open Answer »
