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Inquiry into Physics

8th Edition
Ostdiek
ISBN: 9781337515863
Textbook Problem

A 200-k.g communications satellite is placed into a circular orbit around Earth with a radius of 4.23 107 m (26,300 miles) (Figure 2.57),

(a) Find the gravitational force on the sateline. (There is some useful information in Section 2.7.)
(b) use the equation for equation for to centripetal force the speed of the Stateline.
(c) Show that the period of the Stateline −the time it takes to complete one orbit −is 1 day. (the distance it travels during one orbit is 2 ,6.8 times the radius.) This is a gtosynrhnnoiss orbit: the satellite stays above a fixed point on Earths equator.

To determine

(a)

The gravitational force on a satellite of mass 200-kg, orbiting the earth in a circular orbit of radius 4.23×107m.

Explanation

Given:

Mass of the satellite

m=200-kg

Radius of the satellite’s orbit

r=4.23×107m

Mass of the earth (from standard tables)

M=5.972×1024kg

Universal gravitational constant

G=6.67×1011N-m2/kg2.

Formula used:

The gravitational force between the satellite and the Earth is given by,

F=GMmr2.

Calculation:

Substitute the values of the variables in the formula and calculate the gravitational force.

F=GMmr2=(6

To determine

(b)

The speed of the satellite using the expression for the centripetal force.

To determine

(c)

The period of the satellite and show that it has a value equal to 1 day.

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