A longitudinal wave travels on a slinky or any long spring. The wave is represented by the equation z(z, t) = 1.2 cm cos(1800 rad/s t + 60
z). What is the wave vector of the wave?
A. 60 
in the + z direction
B. 60 in the - z direction
C. 60 in the + x direction
D. 60 in the - x direction
B. 60 in the - z direction
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A device obeying Ohm's law must have a resistance which
A) is proportional to voltage. B) is proportional to current. C) is constant. D) is zero.
The activity of a radioactive source is often
measured in a unit called? a) the joule b) the u c) the microgram d) the cpm
The names of the Martian moons, Phobos and Deimos, mean ______________ and ______________
Fill in the blank(s) with correct word
A tracking station on Earth observes a rocket move away at 0.370c. This rocket is designed to launch a projectile at 0.505c relative to the rocket
What speed (in terms of the speed of light) does the tracking station measure for the projectile if it is fired (a) straight ahead of the rocket or (b) backward from the rocket?