Phy121 are these answers correct?

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AI Thread Summary
The discussion revolves around a student seeking confirmation on their answers for a PHY121 practice test before an upcoming exam. The student provides a link to the practice test and lists their answers for multiple-choice and calculation questions. They request assistance, particularly for the first eight conceptual questions, while expressing concern about sharing a .doc file. Respondents emphasize the importance of posting questions directly in the thread for easier assistance and suggest showing work for better guidance. The overall focus is on obtaining help efficiently while adhering to community norms.
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Homework Statement


I have a test in the morning. Here is a link to the website where a practice test is located. http://www.mc.maricopa.edu/~vantassell/PHY121/phy121.html . It is on the left under sample test 1.

Homework Equations


The relevant equations are at the bottom of the test.


The Attempt at a Solution


Here are my answers:
1.D
2.C
3.D
4.A
5.B
6.D
7.D,A,C,F,B,E
8.E,D,C,A,B,F
9.Skip
10.Skip
Calculations
1. mag=sqrt(106.9) theta= 228 degrees
2.91.5 m/s
3. 29m/s
4.a.87.5m b.32.5s
5. no
6.a 285m b.236.4m c. 9.5 m/s d.-7.9m/s


I rounded a lot of the answers. If someone has time, could you see if my answers are correct? Thanks

-Mark
 
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If no one has time for the entire practice exam, maybe someone could check the first 8 multiple choice conceptual questions? That would help a lot.
 
I, along with many other homework helpers, am not going to open a .doc file from a university website. Repeat those questions for which you are unsure of your answers.

In general, you are much more likely to get help from people at this site if you
  • Make it easy on us. Put the question in the post. Expecting us to open some potentially virus-infected .doc file just to see the question is not making things easy on us.
  • Show some work.
  • Keep the post limited in scope. Which problems are you specifically having problems solving?
 
Thread 'Variable mass system : water sprayed into a moving container'

Thread 'Variable mass system : water sprayed into a moving container'

Starting with the mass considerations #m(t)# is mass of water #M_{c}# mass of container and #M(t)# mass of total system $$M(t) = M_{C} + m(t)$$ $$\Rightarrow \frac{dM(t)}{dt} = \frac{dm(t)}{dt}$$ $$P_i = Mv + u \, dm$$ $$P_f = (M + dm)(v + dv)$$ $$\Delta P = M \, dv + (v - u) \, dm$$ $$F = \frac{dP}{dt} = M \frac{dv}{dt} + (v - u) \frac{dm}{dt}$$ $$F = u \frac{dm}{dt} = \rho A u^2$$ from conservation of momentum , the cannon recoils with the same force which it applies. $$\quad \frac{dm}{dt}...
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