Atransverse wave is traveling on a string stretched along the horizontal x-axis. the equation for the
vertical displacement y of the string is given by y = 0.0020 cos[? (15x - 52t)], where all quantities are in
si units. the maximum speed of a particle of the string is closest to
a) 0.33 m/s.
b) 0.43 m/s.
c) 0.53 m/s.
d) 0.64 m/s.
e) 0.74 m/s.

The rocket is fired vertically and tracked by the radar station shown. when θ reaches 66°, other corresponding measurements give the values r = 32700 ft, r¨ = 85 ft/sec2, and θ˙ = 0.019 rad/sec. calculate the magnitudes of the velocity and acceleration of the rocket at this position.

Uranium has two naturally occurring isotopes. 238u has a natural abundance of 99.3% and 235u has an abundance of 0.7%. it is the rarer 235u that is needed for nuclear reactors. the isotopes are separated by forming uranium hexafluoride uf6, which is a gas, then allowing it to diffuse through a series of porous membranes. 235uf6 has a slightly larger rms speed than 238uf6 and diffuses slightly faster. many repetitions of this procedure gradually separate the two isotopes. what is the ratio of the rms speed of 235uf6 to that of 238uf6? express your answer to five significant figures.

Why does some plastic stick to your skin?