A student is in her dorm room, sitting on her bed doing physics homework. The do
ID: 1358993 • Letter: A
Question
A student is in her dorm room, sitting on her bed doing physics homework. The door to her room is open. She wants to shut the door quickly, so she throws a bouncy ball (which she keeps next to her bed for this purpose) against the door. The ball follows the path shown in the top-view diagram at right. It hits the door squarely and bounces straight back. If the bouncy ball has a mass m, hits the door with a speed v, and bounces backward with a speed essentially equal to v, w hat is the change in the bouncy ball's momentum? The student could have used a clay ball that stuck to the door. Consider a clay ball with the same mass as the bouncy ball that is thrown at the same speed at the door, where it sticks and stops moving. What is the change in the clay ball s momentum? The change in momentum of the door is the same size as the change in momentum of the balk but it has the opposite sign What is the change in momentum of the door from the bouncy ball? What a the change in momentum of the door from the clay ball ? Which provides the greatest change in momentum ---what should you throw at a door if you want to give the door the largest "push possible: something that sticks or something ihat bounces backward If the bouncy ball has mass 0.10kg, was moving initially at lO.m/s, and was in contact the door for 0.010s, calculate the force exerted by on the bouncy ball on the door. What is the direction of the force on the door: forward or backward ? What is the direction of the force on the ball: forward or backward ? A mountain climber is using a rope to stop their fall. Should they use a a still rope that stops them quickly or a stretchy nylon rope that stops them slowly? (consider which will exert a smaller force on their body and thus cause less bruising or possibly broken bones.) A desk toy has balls hanging from strings; you pull one ball back, let it hit the others, and watch one ball bounce out the other side. Is this sticking or bouncing? Is the collision elastic or inelastic? What is conserved? If the momentum of the incoming ball is -l0.kgm/s and KE is 35 J, what is the momentum and KE of the outgoing ball?Explanation / Answer
multiple questions asked ....As I am allowed to solve only 1 question at a time....So I am solving question 10) and raise another question again.
SOLUTION 10 )
The only statement that is correct is the option 3) which states that the cart will slow down because the horizontal momentum of the cart rain sysytem is conserved and the cart is also gaining mass.
I hope I have cleared your doubt regarding the question.
Let me know in case of problem.
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