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Problems with solutions
I.D
Level
Problem
Problem Topic
85
High school
The momentum of the particle is proportional to the square of its velocity
True
False
. . . continues
Work,Power & Energy
86
High school
How fast must a 10.5 g bullet be traveling when it strikes a ballistic pendulum that consists of a block of wood of mass 3.0 kg that is suspended by a cord ? The bullet gets embedded in the block . The block rises by 0.22m after the impact. . . . continues Work,Power & Energy
87
High school
Two car suffer a head on collision . What is conserved in the collision ?
none of these
kinetic energy
momentum
mechanical energy and momentum
. . . continues
Work,Power & Energy
88
High school
A plane , flying horizontally , releases a bomb, which explodes before hitting the ground. Neglecting air resistance, the centre of mass of the bomb fragments, just after the explosion
is zero
moves along a parabolic path
moves vertically
moves . . . continues
Work,Power & Energy
89
High school
A bullet,of mass 20 g , traveling at 350 m/s , strikes a steel plate at an angle of 30 degree with the plane of the plate . It ricochets off at the same angle , at a speed of 320 m/s . what is the magnitude of the impulse that the wall gives to the bullet ?
0.30 N s
< . . . continues Work,Power & Energy
90
High school
In an inelastic collision , the final total momentum is
the same as the initial momentum
less than the initial momentum
none of these
more than the initial momentum
. . . continues Work,Power & Energy
91
High school
A 3kg ball of putty moving at 1 m/s collides and sticks to a 2 kg ball initially at rest . The putty and ball then moves with a momentum of :
4 N s
1 N s
3 N s
2 N s
0 N s
. . . continues Work,Power & Energy
92
High school
A rifle weighs 40.N and its barrel is 0.80 m long. It shoots a 28 g bullet , which leaves the barrel with a speed of 380 m/s (muzzle velocity) after being uniformly accelerated . What is the average reaction force acting on the rifle ? (using the method)
a). kinematics and f = ma
b) energy method
c) momentum-impu . . . continues
Work,Power & Energy
93
High school
A 300g air track glider has mounted on it a toy gun of mass 80 g , which fires a 14.0 g rubber dart . The velocity of the dart as observed in the lab is 10.0 m/s what is the recoil velocity of the glider and gun if they are at rest when the gun is fired ? PART B A light and a heavy body have equal kinetic energies . Which one has the larg . . . continues Work,Power & Energy
94
High school
a) Two children tug on a rope against each other (tug of war) . If each child exerts a pull of 30.N. what is the tension of the rope ?
b) One end of the rope is now tied toa tree and both children tug on the free end with a force of 30N each . Is the rope tension different in this case ? If so , what is it ?
Calcu . . . continues
Work,Power & Energy
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