An air craft executes a horizontal loop at a speed of 720 km/h with its wings banked at 15° .What is the radius of the loop?
13 x 103 m
15.2 x 103 m
13.6 x 103 m
None of these
A gun of mass 1kg fires a bullet of mass 1g with a velocity of 1ms-1.The recoil velocity of the gun is
1ms-1
0.1ms-1
0.01ms-1
0.001ms-1
What will be the ratio of the distance moved by a freely falling body from rest in 4th and 5th seconds of journey ?
4 : 5
7 : 9
16 : 25
1 : 1
A man slides down a light rope whose breaking strength is η times his weight .What should be his maximum acceleration so that the rope does not break ?
g (1 - η)
ηg
g /1+η
g/1 - η
If the unit of force and length are increased by four times, then the unit of energy is increased by
2 times
4 times
8 times
16 times
A body of mass 10 kg falls vertically on a muddy ground with a velocity of 20 m/s and penetrates through a vertical depth of 0.3 m.Calculate the average force exerted by the muddy ground.Take g = 10 m/s2 .
6767 N
7894 N
7845 N
5894 N
What should be the tension in a rope pulling vertically upward a mass of 100 kg so that starting from rest it acquires a velocity of 4 m/s in 1.5 seconds?
1278 N
1247 N
1287 N
1894 N
Kilowatt-hour is the unit of
power
energy
impulse
none of the above
Potential energy cannot be expressed in
J
N m
Ns
Ws
An army vehicle of mass 1000 kg is moving with a velocity of 10 m/s and is acted upon by a forward force of 1000 N due to engine and a retarding force of 500 N due to friction.What will be its velocity after 10 sec ?
5 m/s
10 m/s
15 m/s
20 m/s
