2 mass and veloc type physx problems

  • Thread starter jgoff14
  • Start date
  • #1
16
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Ive got two problems that are driving me crazy

Homework Statement



3. A 200 g hockey puck is launched up a metal ramp that is inclined at a 30° angle. The coefficients of static and kinetic friction between the hockey puck and the metal ramp are μs = 0.40 and μk = 0.30, respectively. The puck's initial speed is 96 m/s. What vertical height does the puck reach above its starting point?


4. The figure shows a 100 kg block being released from rest from a height of 1.0 m. It then takes 0.76 s to reach the floor. What is the mass of the block on the left?

(attached pic)

Homework Equations



f=ma

The Attempt at a Solution



i dont really have an attempt just a bunch of notes and calculations but i dont know how to bring it together
N=9.8*200sin(300) => 980n
well im looking over it and dont have anything more than that i cant even tell what i was doing before. PLEASE help
 

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Answers and Replies

  • #2
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Without an attempt, there's not much anyone can do to really help. I can tell you that for the second question, draw a free body diagram for each of the blocks, and since it is a taut string, the tensions T will be the same. Then use Fnet = ma, having found a using some basic 1 dimensional equations, and solve for m.
 

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