Mars rotates on its axis once every 1.02 days (almost the same as earth does). (a) find the distance from mars at which a satellite would remain in one spot over the martian surface. (use 6.42 x 10^23 kg for the mass of mars).
(b) find the speed of the satellite.

V = 1.45x10^3 m/s

Explanation:

number of days in sec = 1.02days * 86400s = 88128 s              

Mass of Mars is 6.42*10^23 Kg

gravitational constant G = 6.674*10^{-11}

(b)

V

answer: the exterior temperature of commercial jet planes as they leave the stratosphere and return to the ground increases steadily.

explanation:

the lower most layer of atmosphere is troposphere which extends from 0 to 12 km above the surface of the earth. the temperature initially decreases as distance is increased from the earth's surface. commercial jets fly in lower part of the stratosphere. the stratosphere extends upto 50 km. the temperature in stratosphere starts rising again due to presence of ozone which traps the uv rays.

thus, when the planes leave the stratosphere and return to the ground, the exterior temperature increases steadily.

f=ma newton's second law 7x8=56n