# Just a LIL Physics Help

1. Mar 22, 2005

### godemiche

Just a LIL Physics Help :)

Some odds of my homework I couldn't figure out,,, any help would be appreciated and REPPED

1.
Find the centripetal accelerations of a point on the Equator, due to the rotation of Earth about its axis.
m/s2

2.
Two objects attract each other with a gravitational force of magnitude 0.99 10-8 N when separated by 19.6 cm. If the total mass of the two objects is 5.08 kg, what is the mass of each?
kg (heavier mass)
kg (lighter mass)

3.
A satellite moves in a circular orbit around the Earth at a speed of 5458 m/s.
(a) Determine the satellite's altitude above the surface of the Earth.
m
(b) Determine the period of the satellite's orbit.
h

if needed
mass of earth = 5.98 E 24
Radius of earth = 6.38 E 6
G = 6.67 E -11

2. Mar 22, 2005

for 1. use the equation $$a_c = \frac{v^2}{r}$$ to find a, you need to find out at what speed you are rotating at. Thisnk about it, you know how long a day is, you know the earths radius. Solve the problem.

for 2. use Newtons law of gravitational attraction: $$F_g = \frac{Gm_{1} m_{2}}{d^s}$$ you know the distance between the two, you know the G constant, you have the force. To solve for the mass inequality, just set up an equation for mass using 5.08-x and x as your two masses. Now solve for x.

3. Ill let you ponder on that one by yourself. I alwready solved the first two for you, which I shouldnt have.

Regards,