If the pitch of the sound coming out of a speaker increases, which statement is true about the sound wave?
a. the wavelength increases
b. the wavelength decreases
c. the amplitude increases
d. the amplitude decreases

Many machines- including inclined planes such as ramps- increase the strength of the force put into the machine but decrease the distance over which the force is applied. true or false

The substances that are necessary for producing of certain hormones and that store and transport vitamins

The atoms in a nickel crystal vibrate as harmonic oscillators with an angular frequency of 2.3 × 1013 rad/s. the mass of a nickel atom is 9.75 × 10-26 kg. what is the difference in energy between adjacent vibrational energy levels of nickel? (h = 6.626 × 10-34 j • s, , 1 ev = 1.60 × 10-19 j)