True or False: if a sound wave's frequency changes, its speed stays the same

Which features on mars point to the possibility of liquid water on the planet? impact craters with sharp rims volcanic cones with craters gullies and stream-like channels mountain ranges with faults

The molecular mass of a gas is (select all that apply) a. independent of the type of gas b. the same number as the atomic (or molecular) mass, but measured in grams c. dependent on the temperature d. the mass of a mole of the gas

7)an object is thrown straight up with an initial velocity of 3 m/s. what is its acceleration at its maximum height? a)zero b)3 m/s2 c)-9.8 m/s2 d)none of the above