Power can be expressed

1. in joules per watt, or in newtons per second

2. in joules per second, or in watts

3. in joules, or in newton-meters

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?