The Earth is 93 million miles (mi) from the Sun and its period of revolution is 1 year = 3.15 107 s. What is the acceleration of the Earth in its orbit about the Sun?
a. 18.6 mi/s2
c. 13.6 10-6 mi/s2
b. 9.3 10-3 mi/s2
d. 3.7 10-6 mi/s2
Question 2
A cylindrical space colony 13 km in diameter and 30 km long has been proposed as living quarters for future space explorers. Such a habitat would have cities, land, and lakes on the inside surface and air and clouds in the center. All this would be held in place by the rotation of the cylinder about the long axis. How fast would such a cylinder have to rotate at its perimeter to produce a 1-g gravitational field at the walls of the cylinder?
a. 200 m/s
c. 650 m rad/s
b. 250 m/s
d. 800 m rad/s
Scaling the Earth down to the size of a basketball, the Moon is roughly the size of a tennis ball. T
Earth with Rings
Earth’s Spheres
Overfished per year
Embryonic Period
Embryonic Period