According to the droppler effect, what appears to happen when a light source moves further away from an observer? (20pts) a. the electromagnetic waves appear more red in color. b. the waves compress and the frequency appears to increase. c. the electromagnetic waves appear more blue in color. d. the waves lengthen and frequency appears to increase.

An object thrown vertically upward from the surface of a celestial body at a velocity of 36 m/s reaches a height of sequalsminus0.9tsquaredplus36t meters in t seconds. a. determine the velocity v of the object after t seconds. b. when does the object reach its highest point? c. what is the height of the object at the highest point? d. when does the object strike the ground? e. with what velocity does the object strike the ground? f. on what intervals is the speed increasing?

According to newton’s first law of motion, which force is expected to cause a body to accelerate?

The freezing and boiling point of a substance changes as the air pressure around it changes. for example, at a lower air pressure (higher altitude) it is easier for water molecules to escape from liquid into the air. in a high altitude city such as denver, colorado compared to a sea-level city such as houston, texas, water