V. Answer the following questions. A metal block weighs 500 gf in air and 460 gf when completely immersed
water. Calculate the upthrust on the block.
Give reasons for the following:
(1) Cutting is easier with sharp tools.
(ii) Sometimes, people bleed from nose while climbing uphill rapidly.
(iii) A body weighs less inside water.
(iv) A balloon filled with hydrogen rises up only to a certain height.

1which body contains the majority of the mass in the solar system earth jupiter the moon the sun 2 what keeps the objects in the solar system such as planets orbiting around the sun the force of gravity the galaxy exerts on all objects within it including the solar system the great distance between the sun and the planets the sun's nuclear fusion which acts on each object the gravitational force between the sun and each object in the solar system