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Which physical quantity does this electronvolt measure? How is it related to the S.I. unit of this quantity?
Electronvolt measures energy.
It is related to the S.I. unit of enrgy joule as 1 eV = 1.6 x 10-19 J.
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What should be the angle between force and displacement be to get the
i) minimum work
ii) maximum work?
i) For minimum work to be done, the angle should be 90o
ii) For maximum work, the angle should be 0o.
State Newton’s Second Law of motion.
Newton’s second law of motion states that the rate of change of linear momentum is directly proportional to the applied force and takes place in the direction of the applied force.
The work done by the heart is 1 Joule per beat. Calculate the power of the heart if it beats 72 times in one minute.
Work done in one beat = 1 J
Work done in 72 beats = 1 x 72 = 72 J = 60 sec
Therefore, power = P = W/t = 72 / 60 = 1.2 W
Mention two properties of a wave: one property which varies and the other which remains constant when the wave passes from one medium to another.
The two properties are:
i) Wavelength ii) Frequency
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Mock Test Series
