Two objects of different masses falling freely near the surface of moon would
(a) have same velocities at any instant
(b) have different accelerations
(c) experience forces of same magnitude
(d) undergo a change in their inertia
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The gravitational force between two objects is F. If masses of both objects are halved without changing distance between them,
gravitational force between two objects is (a) F/4
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The potential energy of a freely falling object decreases progressively. Does this violate the law of conservation of energy? Why?
The potential energy of freely falling object decreases and its kinetic energy increases (as its velocity increases) progressively. So, in this way the total mechanical energy (Kinetic energy + potential...
1 Answers 1 views
A freely falling object eventually stops on reaching the ground. What happens to its kinetic energy?
When a freely falling body eventually stops on reaching the ground, its kinetic energy gets converted into heat energy (as the body and ground become warm due to collision), sound...
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(a) Give reason for the following: (i) The kinetic energy of a freely falling object increases, yet it holds law of conservation of energy.
(a)(i) According to the law of conservation of energy, energy can neither be created nor be destroyed but can be transformed from one form to another. Here, the increase in...
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(a) Name the type of energy possessed by a freely falling body of mass ‘m’ at the highest point 'h'.
(a) Potential energy, P.E. is the energy possessed by a body of mass, m after reaching a height, h. it is given by, P.E. = mgh (b) The capacity to do...
1 Answers 1 views
Neglect the effect of rotation of the earth. Suppose the earth suddenly stops attracting objects placed near its surface.
(d) remain standing. Explanation: The person will loose weight but remain standing. As no force acts on him, so according to "Newton's First Law of Motion" he will remain in his state of rest...
1 Answers 1 views
A body falling vertically downwards under gravity breaks in two parts of unequal masses.
(c) does not shift horizontally Explanation: Since the body breaks due to internal forces, the center of mass of all parts taken together will remain the same and will not shift horizontally.
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A 20 cm long capillary tube is dipped in water. The water rises up to 8 cm. If the entire arrangement is put in a freely falling elevator,
The correct answer is (d) 20 cm. Explanation: The rise in a capillary tube is given as h = 2S.cosθ/rρg When the entire arrangement is in a freely falling elevator, the effective...
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A 20 cm long capillary tube is dipped in water. The water rises up to 8 cm. If the entire arrangement is put in a freely falling elevator
The correct answer is (4) Explanation: The rise in a capillary tube is given as h = 2S.cosθ/rρg When the entire arrangement is in a freely falling elevator, the effective g =...
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Neglect the effect of rotation of the earth. Suppose the earth suddenly stops attracting objects placed near its surface,
(d) remain standing. Explanation: The person will loose weight but remain standing. As no force acts on him, so according to "Newton's First Law of Motion" he will remain in his state...
1 Answers 1 views