Whose contributions to astronomy explained how planets were held in their orbits?

A. Aristotle

B. Copernicus

C. Ptolemy

D. Newton

E. Brahe

F. Kepler

Two charged spheres are on a frictionless horizontal surface when does the charge of + 3.0•10^-6C. The other has a + 6.0•10^-6C charge. Sketch the two spheres showing off all forces on them.

A car moved with a constant speed of 104km/hr how long will it take to travel a distance of 422.9km?

Is water wet yes or no?

Which one of the following is a double-displacement reaction? A.) 2Li (s) + ZnSO4 (aq) → Li2SO4 (aq) + Zn (s) B.) HNO3 (aq) + KOH (aq) → H2O (l) + KNO3 (aq) C.) Fe (s) + CuSO4 (aq) → FeSO4 (aq) + Cu (s) D.) 2Cu (s) + O2 (g) → 2CuO (s)

In cloud formation, water vapor turns into water droplets which get bigger and bigger until it rains. This will cause the temperature of the air in the clouds to: a. get warmer. b. get cooler. c.

A ball which is dropped from the top of a building strikes the ground with a speed of 30m/s. Assume air resistance can be ignored. The height of the building is approximately

Water in central Texas comes from the Edwards Aquifer and tends to be hard. Which of the following would you expect to find in this water? O A. Carbon dioxide O B. Calcium ions O C. Biotic factors O D. Oxygen gas

As you found in Part A, your weight will be greater than normal when the elevator is moving upward with increasing speed.

Which of the following lists contains only examples of renewable sources of energy? A. wind, tidal, geothermal, and hydroelectric B. coal, solar, wind, and biomass C. fossil fuels and nuclear energy D. hydroelectric, petroleum, solar, and wind

How do particles of gases affect one another's motion