At an altitude of 3 times the radius of the Earth, the acceleration due to gravity is
a. g/3.
c. g/27.
b. g/9.
d. not given.
Question 2
Two objects are in circular orbits of different radii around the Sun. Which object has the lowest orbital speed?
a. The one closest to the Sun.
b. The one farthest from the Sun.
c. Once in orbit around the Sun, all objects have the same orbital speed regardless of distance from the Sun. It is the greater radius and greater resulting circumference that causes the object farther from the Sun to take longer to complete an orbit.
d. This cannot be found without knowing the relative masses of the objects.
The Sun as it appears from the surface of Earth before sunset.
Earth’s history spans 4.5 billion years. Geologists and paleontologists have pieced together the his
Gravity
An X-ray of the complete fracture of a radius.
Slapping tapotement on the bottom of the foot. Slap lightly 4–5 times.
Humans are related to Earth’s other organisms