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A hunter fires a gun while standing with the bottom of the gun against her shoulder. If the forward momentum of the bullet is the same as the backward momentum of the gun, why is it not dangerous to be hit by the gun as it is by the bullet?
You are standing perfectly still and then take a step forward. Before the step, your momentum was zero, but afterwards you have some momentum. Is the principle of conservation of momentum violated in this case? Explain your answer
An airbag in an automobile inflates when a collision occurs, which protects the passenger from serious injury. Why does the airbag soften the blow?
Derive this formula for elastic collision
V1=(2m2 all over m1+m2)u1+(m2-m1 over m1+m2)u2
Where m1 is first mass
m2 us second mass
Derive this formula for elastic collision
V1=(m1-m2 all over m1+m2)u1+(2m2 over m1+m2)u2
A car of mass m travelling at speed v crashes into the rear of a truck of mass 2m that is at rest and in neutral at an intersection. If the collision is perfectly inelastic, what is the speed of the combined car and truck after the collision?
A 3kg object moving to the right on a frictionless, horizontal surface with a speed of 2m/s collides head on and sticks to a 2kg object that is initially moving to the left with a speed of 4m/s. After the collision:
A. What is the kinetic energy of the system?
B. What is the momentum of the system?
A 5.00g bullet moving with initial speed of vi = 400 m/s is fired into and passes through a 1.00kg block. The block , initially at rest on a frictionless, horizontal surface, is connected to a spring with force constant 900N/m. The block moves 5.00cm to the right after impact before being brought to rest by the spring. Find the speed at which the bullet emerges from the block assuming that energy is conserved.
An object of mass 80kg is whirled round in a vertical circle of radius 2m with a constant velocity of 6m/s. Calculate the maximum and minimum tensions in the string.
A racing car of 1000kg moves round a banked track at a constant speed of 108 km/h. Assuming the total reaction at the wheels is normal to the track, and the horizontal radius of the track is 100m, calculate the angle of inclination of the track to the horizontal and the reaction at the wheels.
