A new planet named Vulcan has been discovered. Vulcan is a rather large planet with a radius twice that of Earth and a mass three times that of Earth. An astronaut has a mass of 60.0 kg and weighs about 132 lbs. on Earth. What is the acceleration due to gravity on the surface of Vulcan?

The following numerical values may be helpful in this question.

G = 6.67 10^-11 Nm²/ kg²

Earth's mass = 5.98 10²⁴ kilograms

g = 9.80 m/sec²

1 kilometer = 1000 meters

	a.	2.45 m/s2
	b.	4.90 m/s2
	c.	7.35 m/s2
	d.	29.4 m/s2
	e.	none of the items.

A stone of mass 1.0 kg is dropped from rest at the top of a 100.0 meter high building. Assume there is no air resistance. What is the gravitational potential energy of the stone relative to the ground just before it is released at the top of the building?

The following numerical values may be helpful in this question.

G = 6.67 10^-11 Nm²/ kg²

Earth's mass = 5.98 10²⁴ kilograms

g = 9.80 m/sec²

1 kilometer = 1000 meters

	a.	0 joules
	b.	9.8 joules
	c.	98 joules
	d.	100 joules
	e.	980 joules

if a rock is tied to a string and rotated in a vertical circle, then the magnitude of the tension in the string is:

	a.	greatest when the rock is at the highest point of its circular motion.
	b.	greatest when the rock is at the midpoint of its motion and the rock's velocity is going up.
	c.	greatest when the rock is at the midpoint of its motion and the rock's velocity is going down.
	d.	greatest when the rock is at the lowest point of its circular motion.
	e.	constant throughout a cycle.