Multiple choice: a small amplitude transverse wave is travelling on a string. the frequency of the wave is suddenly doubled. which one of the following is a true statement?
a) the period of the wave doubles
b) the wavelength doubles
c) the speed of the wave doubles
d) the wavelength is cut in half
e) the speed of the wave is cut in half

The image shows a pendulum in simple harmonic motion the pendulum starts at a and swing to e

Samir watches a 100-minute movie on his spaceship. maria's spaceshipe flies in the same direction as samir's spaceship but she observes his move to last 125 minutes and his spaceship to be 40 m long. how long does samir observe his own spaceship to be? according to an observer on earth, planet x is stationary. maria and samir depart earth on their spaceships at the same time, each flying at 0.5c. maria flies toward planet x and samir flies in the opposite direction. according to maria, her voyage to planet x takes 9 years. how many years does marias voyage take according to samir?

The slope of a velocity time graph over any interval of time gives the during that interval