Last Updated On [03-11-2023]
A car of mass ‘
’ is driven with acceleration ‘
’ along a straight level road against a constant external resistive force ‘
’. When the velocity of the car is ‘
’, the rate at which the engine of the car is doing work will be
a)
b)
c)
d)
A car of mass ‘ ’ is driven with acceleration ‘ ’ along a straight level road against a constant external resistive force ‘ ’. When the velocity of the car is ‘ ’, the rate at which the engine of the car is doing work will be
a)
b)
c)
d)
Question ID - 50844 :-
A car of mass ‘ ’ is driven with acceleration ‘ ’ along a straight level road against a constant external resistive force ‘ ’. When the velocity of the car is ‘ ’, the rate at which the engine of the car is doing work will be
a)
b)
c)
d)
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A car of mass ‘ |
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a) |
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b) |
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c) |
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d) |
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(c) Force required to move with constant velocity
Force is required to oppose the resistive force
|
Power
and also to accelerate the body of mass 
with acceleration 
Power 
Next Question :
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A resonance tube is old and has jagged end. It is still used in the laboratory to determine velocity of sound in air. A tuning fork of frequency 512 Hz produces first resonance when the tube is filled with water to a mark 11 cm below a reference mark, near the open end of the tube. The experiment is repeated with another fork of frequency 256 Hz which produces first resonance when water reaches a mark 27 cm below the reference mark. The velocity of sound in air, obtained in the experiment, is close to: |
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(a) |
328ms−1 |
(b) |
322ms−1 |
|
(c) |
341ms−1 |
(d) |
335ms−1 |
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