If a man-made satellite circulates around the earth at a uniform speed and its orbit radius is 13 times of that of the moon around the earth, the cycle of the satellite is about () A. 1-4 days B. 4-8 days C. 8-16 days D. 16-20 days

If a man-made satellite circulates around the earth at a uniform speed and its orbit radius is 13 times of that of the moon around the earth, the cycle of the satellite is about () A. 1-4 days B. 4-8 days C. 8-16 days D. 16-20 days

According to gmmr2 = MR (2 π T) 2, t = 4 π 2r3gm, then the period ratio of the satellite to the moon is t star, t month = 127 = 133. The period of the moon around the earth is about 27 days, then the period of the satellite is t star ﹥ 5.77 days

The speed of an artificial earth satellite is 2.844 × 10 ^ 7 meters per hour,
The speed of a car is 100 kilometers per hour. Is the speed of this satellite less than that of this car?

(2.844 × 10 ^ 7 m / h) / (100 km / h) = 2.844 × 10 ^ 5 times
The speed of the satellite is 2.844 × 10 ^ 5 times that of the car

The speed of a rocket carrying an artificial earth satellite is 2.88 * 10 7 cubic meters per hour, while that of a jet plane is 1.8 * 10 6 cubic meters per hour
How many times the speed of a rocket is that of an airplane?

2.88*10^71.8*10^6
=[2.88/1.8]*[10^7-10^6]
=1.6*10
=16 times
A: the speed of a rocket is 16 times that of an airplane