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# Circular Motion watch

1. really stuck on these questions have no understand on how to even start them. Q5 , Q7 . thanks for the help in advance.

2. (Original post by Secreay)
really stuck on these questions have no understand on how to even start them. Q5 , Q7 . thanks for the help in advance.

draw a diagram

write down what you know from the question

?
3. (Original post by boner in jeans)
draw a diagram

write down what you know from the question

?
i managed 5,6 but i cannot do 7 at all
4. (Original post by Secreay)
i managed 5,6 but i cannot do 7 at all
well, the satellite's undergoing circular motion

what's the time period of one revolution

once you know that, what's the angular velocity?

finish by

Spoiler:
Show
I get
5. (Original post by boner in jeans)
well, the satellite's undergoing circular motion

what's the time period of one revolution

once you know that, what's the angular velocity?

finish by

Spoiler:
Show
I get (524000N)
er 2pi/24*60*60 ? dont quite understand about the values i need mostly.
6. (Original post by Secreay)
er 2pi/24*60*60 ? dont quite understand about the values i need mostly.
F is the gravitational force the satellite feels, m is the mass of the satellite, omega is the angular velocity and r is the radius (remember to include the distance between the satellite all the way to the centre of the planet)
7. (Original post by boner in jeans)
F is the gravitational force the satellite feels, m is the mass of the satellite, omega is the angular velocity and r is the radius (remember to include the distance between the satellite all the way to the centre of the planet)
this question makes no sense i mean how do you class the mass and the angular velocity ?
8. (Original post by dashdashdash)
this question makes no sense i mean how do you class the mass and the angular velocity ?
well based on what's given in the question

the mass of the satellite is 1 tonne

the angular velocity is
9. (Original post by boner in jeans)
well based on what's given in the question

the mass of the satellite is 1 tonne

the angular velocity is
the book says 38.1N?
10. (Original post by dashdashdash)
the book says 38.1N?
my mistake, I forgot to square the angular velocity!

the book is indeed correct

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