EXNCIRCLE the LETTER that corresponds to the correct option. The law of gravity.

Question

EXNCIRCLE the LETTER that corresponds to the correct option. The law of gravity. applies only to large bodies such as planets and stars. accounts for all known forces. holds only in the solar system. holds everywhere in the universe. Which of the following quantities is not a vector quantity? velocity acceleration mass force The acceleration of a stone thrown upward is greater than that of a stone thrown downward. the same as that of a stone thrown downward. less than that of a stone thrown downward. zero until it reaches the highest point in its path. In order to cause something to move in a circular path, it is necessary to provide a reaction force an inertial force a centripetal force a gravitational force The gravitational force with which the Earth attracts the Moon is less than the force with which the Moon attracts the Earth. is the same as the force with which the Moon attracts the Earth. is more than the force with which the Moon attracts the Earth. varies with the phase of the Moon. How long does a car whose acceleration is 4 m/s^2 need to go from 10 m/s to 30 m/s? 10 s 20 s 40 s 5 s A ball is thrown upward at a speed of 24 m/s. It will reach the top of its path in 0.6 s 1.2 s 1.8 s 2.4 s When the speed of a body is doubled, its kinetic energy is doubled its potential energy is doubled its rest energy is doubled its momentum is doubled The work done in holding a 50-kg object at a height of 2m above the floor for 10s 0 250J 1000J 9800 J

Explanation / Answer

a) law of gravity holds everywhere in the universe. gravitational force is present everywhere.

b)mass has only magnitude. no direction so it is not a vector

c) We know that the acceleration is equal to the force acting on stone divided by net mass. no matter the stone is going up or down, force acting on it is same, i.e gravity. so acceleration is also same. it is not dependent on speed of stone or direction in which its moving or its position. acceleration is always same

B is the answer.... same

d)Centripetal force. To move the object in circular there should be centripetal force.

f) time=velocity/accelaration

=>30-10 m/s / 4m/s2=5s

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