Which of these assumptions is Ptolemy's model of planetary motion based on?

The sun moves around the earth.

The earth moves around the sun.

The stars do not move.

The earth is flat.

Richard rides a bike on a road sloping downward and inclined at an angle of 30° with the horizontal. If he moves at a constant speed of 10 meters/second, calculate his vertical downward velocity.

How much tension is there in a rope that hold a 20-N bag of apples at rest?

What are 3 different forces that act on objects on the earth

If you hold a balloon by a string and the balloon moves toward your sweater and sticks there, what would you infer? A) That the balloon and the sweater have no charges. B) That the balloon and the sweater have like charges.

A satellite orbits earth in a circular orbit. Does Earth's gravity do work on the satellite? Explain.

Which describes a property shared by ultraviolet light and X-rays? A They are both transverse waves. B They share the same wavelength. C They contain less energy than visible light. D They both require a medium to travel through.

What is the potential energy called that is associated with objects that can be stretched

Which of the following is not a current use of radioisotopes? medical diagnosis sterilization of equipment detection of leaks in building structures light fixtures

A Blu-ray disc is approximately 11 centimeters in diameter. The drive motor of a Blu-ray player is able to rotate up to 10,000 revolutions per minute. (a) Find the maximum angular speed (in radians per second) of a Blu-ray disc as it rotates

A body has translatory motion if it moves along a