Which best compares freezing and condensation?

a. Both involve changes between liquids and gases.

b. Both involve changes between gases and solids.

c. Both involve the release of heat.

d. Both involve the absorption of heat.

A hot iron ball of mass 200 g is cooled to a temperature of 22°C. 6.9 kJ of heat is lost to the surroundings during the process. What was the initial temperature of the ball? (ciron = 0.444 J/g°C) A) 23°C B) 78°C C) 100°C D) 155°C

What do you think that astronomers mean when they use the term observable universe? (Hint: Thi. nk of the time it takes for light from very distant objects to reach Earth.)

If a spring has a spring constant of 2N/m and it is stretched 5cm, what is the force of the spring?

Which of the following has the largest momentum? A. a 10kg dog running down the street at 30mph B. a tightrope walker slowly crossing niagara falls C. a 0.02kg bullet moving down the barrel at 800mph D. a semi truck parked in a parking lot

The only force that can act on an object in free fall is.

15 J of work were expended moving an 18 kg block. At what velocity did the block move? Provide step by step walkthrough

Define element and list two examples.

5 Sam is standing in an empty auditorium. He yells and hears his voice echo. What is happening to the sound to cause this echo?

Does the air exert a buoyant force on all objects in air or only on objects such as balloons that are very light for their size?

At what temperature (in K) will 1.0 mol of gas occupy 1.0 m3 at a pressure of 1.0 * 10^4 pa