Johannes Kepler discovered the laws that bear his name by analyzing the observational data of which astronomer?

a. Tycho Brahe

b. Galileo Galilei

c. Sir Isaac Newton

d. Nicolaus Copernicus

Which of the following is a key assumption of the scientific method

Should you choose to throw a rubber ball or a beanbag of equal size and weight?

Water is different from other substances because:a it is more dense as a solid than a liquidb it is less dense as a solid than liquidc it is more dense as a gas than a liquidd it is less dense as a solid than a gas

Would a person wearing dark cloth on a hot day feel cooler or warmer than a person wearing light colored clothing? Explain your answer using what you learned about radiant energy.

Do waterfalls and rapids occur where rivers meet and flow over hard rocks?

A change from one form of energy into another is called a. gravitational potential energy. b. work. c. conservation of energy. d. an energy transformation

4. An airplane must achieve a velocity of 71 m/s for takeoff. If the runway is 1000 m long, what must the acceleration be?

As the average kinetic energy of the particles in a gas increases, which of the following occurs?

Power=170 watts time=20 seconds

What is the charge of alpha, beta and gamma rays?