Change the italicized word to make each sentence true. 1. Echoes occur because sound waves demonstrate a wave behavior called /diffraction/

2. Sound travels slower through /gases/than liquids

3. As the amplitude of a sound wave decreases, the intensity /increases/

Which is not true about oxygen-17 and oxygen-18?

(a) assume the equation x = at^3 + bt describes the motion of a particular object, with x having the dimension of length and t having the dimension of time. determine the dimensions of the constants a and b. (use the following as necessary: l and t, where l is the unit of length and t is the unit of time.) (b) determine the dimensions of the derivative dx/dt = 3at^2 + b. (use the following as necessary: l and t, where l is the unit of length and t is the unit of time.)

An alien spaceship is 500 m above the ground and moving at a constant velocity of 150 m/s upwards. how high above the ground is the ship after 5 seconds?