- #1
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I am having some difficulty answering a few problems on my physics homework.
I don't think that I am coming up with the right equations for given situations in the problems. The questions are as follows:
1. http://herograw.com/8-31.JPG
For this question I am getting [tex]- \frac{1}{2} m_1v^2 - \frac{1}{2} m_1v^2+m_2g\Delta h=-m_1\mu_kd[/tex] where m1 is the block in contact with the surface and m2 is the hanging sphere. When I solve the equation for v (velocity), I get v=4.77 m/s. However, I should be getting a result of 3.74 m/s.
2. http://herograw.com/8-48.JPG
For this equation I get [tex]mgy_{max}-mgh=-mg \mu_k d[/tex] but there needs to be something with the angle to derive that equation given in the problem.
3. http://herograw.com/8-60.JPG
http://herograw.com/figure8.60.JPG
When doing part (a) I was using the equation [tex]\frac{1}{2} m v^2+\frac{1}{2} k d^2=0[/tex]to find d. I got d=0.424 m but for part (b) I would just get v=3 m/s which is given in the question when the object is moving to the right. I'm not sure if this is right or if I'm approaching the question correctly.
4. http://herograw.com/8-72.JPG
For this question I was able to find part (b) but I'm not sure how to start in finding part (a).
Any Help is greatly appreciated.
I don't think that I am coming up with the right equations for given situations in the problems. The questions are as follows:
1. http://herograw.com/8-31.JPG
For this question I am getting [tex]- \frac{1}{2} m_1v^2 - \frac{1}{2} m_1v^2+m_2g\Delta h=-m_1\mu_kd[/tex] where m1 is the block in contact with the surface and m2 is the hanging sphere. When I solve the equation for v (velocity), I get v=4.77 m/s. However, I should be getting a result of 3.74 m/s.
2. http://herograw.com/8-48.JPG
For this equation I get [tex]mgy_{max}-mgh=-mg \mu_k d[/tex] but there needs to be something with the angle to derive that equation given in the problem.
3. http://herograw.com/8-60.JPG
http://herograw.com/figure8.60.JPG
When doing part (a) I was using the equation [tex]\frac{1}{2} m v^2+\frac{1}{2} k d^2=0[/tex]to find d. I got d=0.424 m but for part (b) I would just get v=3 m/s which is given in the question when the object is moving to the right. I'm not sure if this is right or if I'm approaching the question correctly.
4. http://herograw.com/8-72.JPG
For this question I was able to find part (b) but I'm not sure how to start in finding part (a).
Any Help is greatly appreciated.
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