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# LPH105 W15 5.4_5

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## Richard Datwyler

on 12 May 2016

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#### Transcript of LPH105 W15 5.4_5

"I do not really understand how to get the "total" magnitude of acceleration. "
"FBD for this new non-circluar motion didnt click all the way for me. "
" How can you calculate the overall acceleration if the acceleration is non uniform? Wouldn't you have multiple tangential accelerations and multiple radial accelerations?"
Whenever something moves in a circle, it will have an acceleration pointing towards the center of that circle, this is the 'radial' acceleration.

Now is something speeds up, then the tangential velocity will change. This results in two things
there is now a tangential acceleration
And the Radial acceleration will continuously change

This will make the 'net' or 'total' acceleration no longer point to the center of the circle.
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A proposed space station consists of a circular tube that rotates like a bicycle wheel. If the diameter of the station is 1.5 km, what must the rotational speed (rev. per day) need to be to simulate gravity?
How many revolution per minute would a 25 m diameter Ferris wheel need to make for the passengers to feel 'weightless' at the topmost point?
If a curve with a radius of 95 m is properly banked for a car traveling 20 m/s.
A) what is that banking angle
B) what must be the coefficient of static friction for a car not to skid when traveling 25 m/s?

Two objects attract each other gravitationally with a force of 2.5 x 10^-10 N when they are .25 m apart. Their total mass is 4.00 kg. Find their individual masses.
How far from the surface of the earth do you need to be to have the acceleration due to gravity be 1/3 its normal value? (M_e = 5.98 x 10^24 kg r_e =6.38 x 10^6 m)
What is the acceleration due to gravity on the moon? (M_m = 7.35 x 10^22 kg r_m =1.74 x10^6 m)
3.94 kg
.06 kg

4.67 x 10^6 m
1.62 m/s^2 1/6 g
"I don't understand the last problem on the quiz. "
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