KinematicsAverage Speed and Instantaneous Velocity (NEET (National Eligibility cum Medical Entrance Test) Physics): Questions 96  99 of 108
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Question number: 96
» Kinematics » Average Speed and Instantaneous Velocity
Question
A bullet of mass 0.01 kg travelling at a speed of 300 m/s strikes a block of mass 2 kg, which is suspended by a string of length 5 m. The center of gravity of the block is found to rise a vertical distance of 0.1 m The speed of the bullet after it emerges from the block will be 
Choices
Choice (4)  Response  

a.  220 m/s 

b.  110 m/s 

c.  20 m/s 

d.  1.4 m/s 

Question number: 97
» Kinematics » Average Speed and Instantaneous Velocity
Question
A bullet of mass 20 g hits a block of mass 1.98 kg suspended from a massless string of length 100 cm and sticks to it. The bullet flies down at an angle of 30° to the horizontal with a velocity of 200 m/s. Through what height the block will rise
Choices
Choice (4)  Response  

a.  0.75 m 

b.  0.45 m 

c.  0.30 m 

d.  0.15 m 

Question number: 98
» Kinematics » Average Speed and Instantaneous Velocity
Question
The rate of burning of fuel in a rocket is 60 gm/sec. and comes out with and velocity 5 x 10 ^{3} m/s. The force exerted by gas on rocket will be –
Choices
Choice (4)  Response  

a.  2.5 x l0 ^{4 } N 

b.  2.5 x l0 ^{6 } N 

c.  300 N 

d.  200 N 

Question number: 99
» Kinematics » Average Speed and Instantaneous Velocity
Question
A 30 g bullet pierces through a plate of mass m _{1} = 1 kg and then comes to rest inside a second plate of mass m _{2} = 1.5 kg. It is found that the two plates, initially at rest, now move with equal velocities. The percentage loss in the initial velocity of bullet when it is between m1 and m _{2}. (Neglect any loss of material of the bodies, due to action of bullet. ) will be 
Choices
Choice (4)  Response  

a.  25.67% 

b.  46.45% 

c.  20.68% 

d.  39.525% 
