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If a particle is projected inside a horizontal tunnel which is 554 cm high with a velocity of 60 m per sec, the angle of projection for maximum range, is
10°
11°
12°.
8°
9°
A projectile is fired at an angle θ to thevertical.
Its horizontal range will be maximum when θ is
60°
45°
90°.
0°
30°
The rotational velocity of a satellite is increased by 450 m per second if its launch is done from equator
upward.
eastward
northward
southward
westward
The apparent weight of a man in a moving lift is less than his real weight when it is going down with
uniform speed
an acceleration
Linear momentum
retardation.
The maximum frictional force which comes into play, when a body just begins to slide over the surface of a an other body, is known
Sliding Friction
None of these.
limiting friction
Rolling friction
One end of a light string 4 m in length is fixed to a point on a smooth wall and the other end fastened to a point on the surface of a smooth sphere of diameter 2.25 m and of weight 100 kg. The tension in the string is
17.5 kg
25 kg.
19.5 kg
22.5 kg
Ball A of mass 250 g moving on a smooth horizontal table with a velocity of 10 m/s hits an identical stationary ball B on thetable.
If the impact is perfectly elastic, the velocity of the ball B just after impact would be
5 m/sec
10 m/sec
None of these.
Zero
A satellite goes on moving along its orbit round the earth due to
Centrifugal force
Gravitational Force
None of these.
centripital force
If two forces each equal to T in magnitude act at right angles, their effect may be neutralised by a third force acting along their bisector in opposite direction whose magnitude will be
None of these.
3 T
1/2 T
2 T
For a simple pendulum, time period for a beat, is
πl/g
πg/2l
πl/2g
π2g/l.
π2l/g
ω rad/sec is the angular velocity of a crank whose radius is r. If it makes θ° with inner dead centre and obliquity of the connecting rod l is φ, the velocity v of the piston, is given by the equation
ω2(l sin φ - r cos θ tan φ).
ω2(l sin φ + r cos φ tan θ)
ω2(l cos φ + r sin φ tan θ)
ω(l sin φ + r cos φ tan θ)
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