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 particle of mass m has momentum p.Its kinetic energy will be
mp
A certain force applied to a mass m1 gives it an acceleration of 15 m/s2 .The same force applied to a mass m2 gives it an accelerationof 10 m/sec2 .If the two masses are fixed together and the same force is applied to the combination ,find the acceleration.
6 ms-2
0.6 ms-2
4 ms-2
none of these
When two bodies stick together after collision, the collision is said to be
Elastic
Inelastic
Partially elastic
None of the above
A car covers the first-half of the distance between two places at 40 km/h and other half at 60 km/h. The average speed of the car is
40 km/h
48 km/h
50 km/h
60 km/h
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 particle moves along a straight line such that its displacement at any time t is given by The velocity when the acceleration is zero, is
3 ms-1
-12 ms-1
42 ms-1
-9 ms-1
A body dropped from top of a tower fall through 40 m during the last two seconds of its fall. The height of tower is( g = 10 m/s2 )
60 m
45 m
80 m
50 m
Which of the following is not an example of perfectly inelastic collision ?
A bullet fired into a block if bullet gets embedded into block
Capture of electrons by an atom
A man jumping on to a moving boat
A ball bearing striking another ball bearing
A boy pushes a wall and fails to displace it. Therefore, he does
Positive work
negative work
positive but not maximum work
no work at all
