You hear a sound in the distance. suddenly the sound gets deeper, decreasing in pitch. which can you assume about the sound waves reaching your ears?
a. the wavelengths of the new sound waves are longer.
b. the amplitude of the new sound waves has increased.
c. the sound waves have changed their speed so that they are now moving more quickly through the air.

We put a force of 50n on an object and the acceleration is 100 m/s². what is the mass of the object?

Which of the following correctly describes what happens when an atomic bomb explodes? small pieces of fissionable material are joined and form a body with a mass greater than the critical mass, the relative number of neutrons escaping decreases, and a chain reaction and explosion result. large pieces of fissionable matter are brought together quickly and form a body with a mass smaller than the critical mass, the relative number of escaping neutrons increases, and a chain reaction and explosion result.

Objects a and b are visible in the night sky. six months later they are still visible, but object b shows less parallax than object a. which object is closer? a. a b. b c. you would need to wait another six months in order to figure this out. d. you would need to know the objects' angular diameters in order to figure this out.