Welcome to PHY 121 Blog Help. Here's how it works. For each homework question and lab report we will make a post, this will probably contain a few tips on what the problems are about and how to solve them. If you are stuck on something then instead of emailing us directly you should post a comment in reply to the relevant post. We will try to guide you through tough points and help you understand the problems and the concepts behind them.
Tuesday, October 12, 2010
CH7_3 #1
4 comments:
Anonymous
said...
For the first problem, Part C, I do not know if there is a problem with mastering physics but I understand this is mainly a conceptual question. It asks what is the final speed of the stationary ball if the incoming ball is much more massive and the incoming ball has a speed of 200 m/s? The equation also says the collision is perfectly elastic, so momentum is conserved. If all of this is true and since no masses are given, shouldn't my answer simply be 200 m/s? Because I've tried submitting this as "200" and "2.0*10^2" and I still get the question wrong and I'm confused as to why because I've gotten all the other parts of this question correct.
4 comments:
For the first problem, Part C, I do not know if there is a problem with mastering physics but I understand this is mainly a conceptual question. It asks what is the final speed of the stationary ball if the incoming ball is much more massive and the incoming ball has a speed of 200 m/s? The equation also says the collision is perfectly elastic, so momentum is conserved. If all of this is true and since no masses are given, shouldn't my answer simply be 200 m/s? Because I've tried submitting this as "200" and "2.0*10^2" and I still get the question wrong and I'm confused as to why because I've gotten all the other parts of this question correct.
Same problem here... 200 and nothing works.
try doubling it. equation 7.5'.
This problem is discussed in general during workshop today (Fri)
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