A gun is made of a super-low weight but strong material. The bullet for the gun

Question

A gun is made of a super-low weight but strong material. The bullet for the gun is more massive than the gun itself. For such a gun A. recoil problems would be lessened. B. the gun, if unsupported, would have a recoil velocity higher than the bullet velocity C. conservation of momentum is not satisfied. D. the bullet would go faster with less powder. The momentum of a truck is increased by a factor of 2: its weight does not change. Thus, A. its acceleration is doubted B. its speed doubled C. its speed increased by a factor of 4 D its kinetic energy doubled A quantity which is conserved in the collision of a car and a truck is A. kinetic energy B. nervous energy C. momentum of the car D. momentum of the truck E. total momentum A tennis ball bounces off a brick wall. Which of the following is true? A. The total momentum of the ball, wall, and Earth is conserved in this process B. The momentum of the ball is conserved in this process C. It the collision is elastic, then the ball's velocity does not change in this process D. None of these is true Force F, acting for time T and over a distance D, gives impulse I To get the same impulse using half the force, it would be necessary for the force to act A. over a distance 2D. B. over a distance 4D C. over half the distance D. D. for a time 2T. E. for half the time T. Two people sit face to face on nice skateboards that are free to roll without friction. They push each other with a force of 40 N and move apart. Person X, whose mass (including the skateboard) is 50 kg, moves to the left at 3 m/s. Person Z, whose mass (including the skateboard) is 60 kg A. moves to the right at 2.5 m/s B. moves to the right at 1 m/s C. moves to the right at 4 m/s D. moves to the right at 10 m/s. Car A travels with speed v around curve number one, which has a radius r, Car B travels with speed 2v around curve number two, which has a radius 2r The acceleration will be A. greater for car A. B. greater for car B C. zero for both cars D. the same for both cars

Explanation / Answer

Question 13) option B)

Reason : if the gun is unsupported,then it would have a recoil velocity higher than the bullet velocity since the total momentum of the s system is conserved

Question 14 ) option B)

momentum(M) = m*v

Since m is constant ,if momentum increases by factor of 2 , then velocity increases by same factor

If M is doubled, then velocity is doubled

2M = m*(2v)

Question 15) answer) option E)

Reason : total momentum of system is conserved since no external forces are acting on the system

Question 16) option A)

Reason : since no external forces are acting, total momentum of system is conserved

Question 17) option D)

Reason: impulse (I)= force(F) x time (t)

If force is halved, then time should be doubled to maintain the impulse constant

I = (F/2)*(2t) = F*t

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