9. The model of the universe that suggests that the sun is the center of the universe was first developed by

A. Copernicus

B. Brahe.

C. Kepler.

D. Ptolemy.

A man cleaning his apartment pushes a vac-uum cleaner with a force of magnitude 42.8 N. The force makes an angle of 16.5◦with the hor-izontal floor. The vacuum cleaner is pushed2.62 m to the right along the floor. Calculate the work done by the 42.

What is the kinetic energy of a 1,350kg car traveling at a speed of 12m/s?

A homeowner installs an electrical heated mirror into the shower room. When a person has a shower, the heated mirror does not go misty but stays clear, why?

How do physical properties of nonmetals differ from the physical properties of metals?

Physical Properties include ... A. taste, odor, and is corrosive B. taste, texture, and forms hydrogen gas. C. taste, odor, and texture D. texture, odor, and is corrosive

In a series circuit, loads which have the same voltage dropped across them will have?.

When a brick is dropped from the roof of a house, it lands on the ground with a speed v. What will the speed at ground level be for an identical brick dropped from a roof twice as high as the first one?

The scientific method begins with recognizing a problem. The recognized problem in this scenario is, "Why is the printer in the office not working?" Choose the hypotheses that are testable and from which an experiment can be formed.

The correctly balanced equation for H2O2 → H2O + O2 is

How would an unbalanced chemical equation convey misleading information about what took place during a chemical reaction?