Ap Physics Questions Me Highlyyy Appreciateddd

AI Thread Summary
The discussion revolves around a request for help with AP Physics questions after a significant break from studying. The user expresses urgency in needing assistance with multiple-choice questions related to Mechanics and Electricity and Magnetism, and shares a link to a sample question set. Respondents emphasize the importance of the user putting in effort to understand the concepts rather than simply seeking answers. Key concepts discussed include understanding graphs related to collisions and the definition of impulse, which are crucial for answering the physics questions. Overall, the community is willing to assist but encourages self-learning and engagement with the material.
HELP_786
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Ap Physics Questions! Please Help Me! Highlyyy Appreciateddd!

I haven't done any physics work in about half a year n now i need to do sooo many questions in about a months time! ='( pleasee help me with these questions! I would HIGHLY HIGLYY appreciate it sooooooo much for anybody who would help me solve these questions.

http://dsmarketing.com/samples/phys_smpl1.pdf

Also the website above is to the multiple choice questions...i kno they are pretty easy but I forgot how to do them too! ='( I would HIGLLYYYYYYYYYY appreciate if somebody could explain how to get the answers to me PLEASE!
(you need to scroll down to Physics C Mechanics and Physics Electricity and Magnetism Sample Questions)


THANKYOU SOOOOOOOOOOO MUCHH FOR ALL OF YOU WHO CAN HELP ME! =D!

ps...there are more problems comming REALLYY SOON! =)
 

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HELP_786 said:
I haven't done any physics work in about half a year n now i need to do sooo many questions in about a months time! ='( pleasee help me with these questions! I would HIGHLY HIGLYY appreciate it sooooooo much for anybody who would help me solve these questions.

http://dsmarketing.com/samples/phys_smpl1.pdf

Also the website above is to the multiple choice questions...i kno they are pretty easy but I forgot how to do them too! ='( I would HIGLLYYYYYYYYYY appreciate if somebody could explain how to get the answers to me PLEASE!
(you need to scroll down to Physics C Mechanics and Physics Electricity and Magnetism Sample Questions)


THANKYOU SOOOOOOOOOOO MUCHH FOR ALL OF YOU WHO CAN HELP ME! =D!

ps...there are more problems comming REALLYY SOON! =)
Welcome to PF HELP_786,

We are more than happy to help you with your homework, but we will not do your homework for you. You must put some effort into solving the questions yourself. What are your thoughts thus far? What are the concepts involved?
 
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right now I am stuck in just understanding the graph =(...i do not understand where the ball is during the time the force is increasing, staying the same and decreasing =S
 


The graph shows the entire time the ball is in contact with the box, essentially it's a graph of the collision of the two objects.
 


The graph answers the first question for you if you know how to use it. It is showing how the force acting on both objects (in opposite directions) varies during the 10 milliseconds of the collision. Do you recall the definition of impulse?

Oh, and for the purposes of the questions, and because the table surface is frictionless, it is irrelevant exactly where the box and ball are at the time of the collision. (All that will matter are their velocities.)
 
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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