Fv
zero
Fmr
Frm
Correct answer is B
Work is done whenever the given conditions are satisfied. (ii) there is a displacement of the body caused by the applied force along the direction of the applied force. No displacement takes place in this case. So, work done by a centripetal force is always zero.
The work done by centripetal force in the case of a uniform circular motion is 0 joules.
A dam is able to hold a large quantity of water because its wall is
thickest at the top
thickest at the middle
thickest at the bottom
of the same thickness throughout
Correct answer is C
The pressure of the water is much greater deeper down and the dam needs to be thick at the bottom so that it is strong enough to withstand this larger pressure
I. Acceleration of the ball is not directed towards a fixed point
II. Restoring force is not directed towards the centre
III. Acceleration of the ball is not directly proportional to the displacement from a fixed point
Which of the statements above are correct?
I and III only
I and II only
II and III only
I, II and III
Correct answer is A
In SHM, the body must have acceleration in a direction opposite to the displacement and the acceleration must be directly proportional to displacement. Also, the acceleration must be directed towards its mean position. This is not the case with a football on the pitch.
momentum
Inertia
impulse
Energy
Correct answer is B
Inertia is the resistance of the object to any change in its motion, including a change in direction. An object will stay still or keep moving at the same speed and in a straight line, unless it is acted upon by an external unbalanced force.
The diagram above illustrates a simple barometer. Which distance measures the atmospheric pressure?
PQ
QR
RS
QS
Correct answer is B
The height of the mercury column in a simple barometer is calculated as the atmospheric pressure.
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