Which of these travels the fastest?

a. sound in air

b. rocket in space

c. light in vacuum

d. microwaves in glass

A star is observed moving away from Earth. What can you conclude about the spectrum of that star? The spectrum will shift to the blue. The spectrum will shift to the red. The spectrum will not change.

What happens to an object as I️t absorbs radiant energy?

If a raindrop is 0.05 cm3 in volume, what would the volume of an avogadro number of raindrops be?

Alice and jim calculate that they must do 1,800 j of work to push a piano up a ramp. however, because they must also overcome friction they actually must do 2,400 j of work. what is the efficiency of the map

An express train passes through a station. It enters with an initial velocity of 22.2 m/s and decelerates at a rate of 0.142 m/s2 as it goes through. The station is 206 m long. How long is the nose of train in the station?

Which action will slow down the rate of a reaction

You are racing your dog next to a football field. You run from the 10 yard line to the 50 yard line, then turn around and run back to the 30 yard line. What is your distance? What is your displacement?

Which of the following statements about degeneracy pressure is not true? a) Black holes form when gravity overcomes neutron degeneracy pressure. b) Degeneracy pressure arises from a quantum mechanical effect that we don't notice in our daily lives.

A bar magnet and a second object are hung from metal rods. The diagram below shows what happens when both objects are released.

Which measurement below has three significant figures? A. 12,300 lbs B. 12.02 m C. 0.2004 g D. 0.018 km