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

The rigid beam is supported by the three suspender bars. bars ab and ef are made of aluminum and bar cd is made of steel. if each bar has a cross-sectional area of 450 mm2, determine the maximum value of p if the allowable stress is (σallow)st = 200 mpa for the steel and ( σallow)al = 150 mpa for the aluminum. est = 200 gpa and eal = 70 gpa.

If you were to drop a rock from a tall building, assuming that it had not yet hit the ground, and neglecting air resistance. what is its vertical displacement (in m) after 6 s?

Why should seat belts not be mandatory quick plz