Fly a Tank?
A. Collisions with Coupling
(See below for answers)1. A girl, mass 70.0 kg, is running 3.0 m/s east when she jumps onto a stationary skateboard, mass 2.0 kg. What is the velocity of the girl and skateboard assuming they move off together?
2. A wrestler is standing at rest.. Another wrestler, running at 5.0 m/s, grabs him and holds onto him, and the two move off together with a velocity of 2.7 m/s in the same direction in which the second wrestler was running. If the mass of the second wrestler is 100 kg, what is the mass of the first wrestler?
3. A 1 kg glider and a 3 kg glider both slide toward each other at 1 m/s on an air track. They collide and stick. what will be the speed of the combined mass?
B. Collisions without Coupling
(See below for answers)1. A toy truck, with mass 20.0 g, travels along a level tabletop at 0.50 m/s. A miniature car, with mass 5.00 g, speeds headlong toward the toy truck at 0.75 m/s. Immediately after the collision, the toy truck continues in its original direction at 0.10 m/s. What is the velocity of the miniature car?
2. A 1kg ball moving at a speed of 10 m/s in the positive x direction collides head on with a 2 kg ball at rest. What are the velocities of the 1kg and 2 kg ball after the collision?
3. An 74.5 kg object moving to the right at 34.3 cm/sec overtakes and collides elastically with a second 55.8 kg object moving in the same direction at 16.7 cm/s. Find the velocity of the second object after the collision.
4. In an inelastic collision, is the final total momentum more,less, or the same as the initial momentum?
Hey Mr.C, I see that it says "(See below for answers)" but I don't see where they are and I need to see them as I am struggling with Part B 1.
ReplyDeleteThese are from another website where it posts the answers if you pay for the service so he didn't provide us with the answers
DeleteDraw a pictur of the p before & after. Like granny & Ambrose. What was the total before? What's the toy trucks monrntum after? What's missing? Where is it @? This is like accounting. If there is something missing it had to go somewhere. If there is additional it had to come from somewhere... Hope this helps and answers your question. In the future try to post the issue and not yo me as I am like a last resort but had a minute while I am testing my washing machine repair.
ReplyDeleteMy answers:
ReplyDeleteA.
1)2.92 m/s
2)85.19 kg
3) .5m/s
B.
1) .85 m/s
2) Velocity of 1 kg ball: 0 m/s-- i'm not sure if this is correct, if not can someone let me know?
Velocity of 2 kg ball: 5 m/s
3) .625 m/s -- i'm not sure how the ball colliding elastically has an effect in this problem so i might be missing something?
4) The same, momentum is conserved even though in an inelastic collision kinetic energy is lost. In an elastic collision both momentum and kinetic energy are conserved
*IF ANYONE GOT A DIFFERENT ANSWER LET ME KNOW BECAUSE I'M NOT SURE ABOUT ANY OF THESE*
I'll show my work if anybody has any questions
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DeleteLet me rephrase these comments, If the velocity of the 2 kg ball is 5 m/s then that velocity of the 1 kg ball must be zero. However, I believe the velocity of the 2 Kg ball is 6.6 m/s and the velocity of the 1 kg ball is 3.3 m/s.
ReplyDeleteAs for B.3, The fact that the balls are colliding elastically means that there is not a loss of kinetic energy which allows you to create two separate equations to solve the problem.
im not really sure what equation to use for number 2?
ReplyDelete