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Physics: Post your doubts here!

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Dark Destination F.Z.M. 7 The Sarcastic Retard
Mind helping me out on these 2 questions?Im asking for the seconds ans and whether i did the first right?:


1. A rotating space station has radius 1380 m, measured from the center of rotation to the outer deck where the crew lives. What should the period of rotation be if the crew is to feel they weigh one-half of their Earth weight?

g/2=rw^2

w=0.0843=2pi/T

T=2pi/0.0843

T=74.5 s



2. How far would a tennis ball (100g) go if thrown from your catapult at a height of 1 meter, with a force of 50N and at an angle of 50 degrees from the horizontal?
 
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View attachment 57652


View attachment 57653

can someone pls explain this to me?? i got the first one because when S1 is open, no current flows... but i dont get the rest..
TIA :)


Just remember to use P=v^2/R or P=I^2/R when its asks for power dissipated.
also remember that every resistor are the same so they all have the value of 38.4 ohms
Resistor in Series are added while Resistor in parallel are inversed than added.
and also know that current prefers the least resistive path... such in case of ( Closed Closed Open).

Now try to solve it by yourself . If you cannot understand than feel free to contact.
 
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Just remember to use P=v^2/R or P=I^2/R when its asks for power dissipated.
also remember that every resistor are the same so they all have the value of 38.4 ohms
Resistor in Series are added while Resistor in parallel are inversed than added.
and also know that current prefers the least resistive path... such in case of ( Closed Closed Open).

Now try to solve it by yourself . If you cannot understand than feel free to contact.


yep i kinda got it.. thnx :)
 
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