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Chapter 5: Q20. (page 131)

People sometimes ask, "What keeps a satellite up in its orbit around the Earth?" How would you respond?

Short Answer

Expert verified

The satellite remains in the orbit due to its speed and centripetal force.

Step by step solution

01

Step 1. Understanding orbit radius and velocity

In this problem, for a perfectly circular orbit the relation between orbit radius and speed of the orbit will be used.

02

Step 2. Explaining the reason behind keeping a satellite up in its orbit

The satellite is moving in an orbit because of the centripetal force produced by the gravitational force. Also, the centripetal force helps to keep the satellite in its orbit. The speed of the satellite is evaluated by using the radius of the orbit and gravitational acceleration. This speed maintains the satellite to remain in its orbit.

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Most popular questions from this chapter

A jet pilot takes his aircraft in a vertical loop (Fig. 5鈥�38).

(a) If the jet is moving at a speed of840km/hat the lowest point of the loop, determine the minimum radius of the circle so that the centripetal acceleration at the lowest point does not exceed 6.0 g鈥檚. (b) Calculate the 78-kg pilot鈥檚 effective weight (the force with which the seat pushes up on him) at the bottom of the circle, and (c) at the top of the circle (assume the same speed).

FIGURE 5-38 Problem 12.

For each of the cases described below, sketch and label the total acceleration vector, the radial acceleration vector, and the tangential acceleration vector. (a) A car is accelerating from 55 km/h to 70 km/h as it rounds a curve of constant radius. (b) A car is going a constant 65 km/h as it rounds a curve of constant radius. (c) A car slows down while rounding a curve of constant radius.

A coin is placed 13.0 cm from the axis of a rotating turntable of variable speed. When the speed of the turn-table is slowly increased, the coin remains fixed on the turntable until a rate of 38.0 rpm (revolutions per minute) is reached, at which point the coin slides off. What is the coefficient of static friction between the coin and the turntable?

Calculate the acceleration due to gravity on the Moon, which has radius1.74脳106mand mass7.35脳1022kg?

The source of the Mississippi River, is closer to the centre of the Earth than is its outlet in Louisiana (because the Earth is fatter at the equator than at the poles). Explain how the Mississippi can flow "uphill."
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