On average, the Milky Way forms about ________ stars per year
Fill in the blank(s) with correct word
ten
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Outline a simple model of planet building
What will be an ideal response?
A puck on a frictionless air hockey table has a mass of 5.0 kg and is attached to a cord passing through a hole in the surface as in the figure. The puck is revolving at a distance 2.0 m from the hole with an angular velocity of 3.0 rad/s. The angular momentum of the puck (in kg?m2/s) is 
A. 80 B. 20 C. 30 D. 60 E. 50
The graphs below represent current and voltage phasors at one instant of time. The solid arrows represent the voltage phasors, ?V, and the dashed arrows represent the current phasors, Imax.Which graph shows the correct relationship between current and voltage phasors for an inductor in an RL circuit?
a.
b.
c.
The electrons that make up the current in an electric circuit move by
1) interacting with the electric field established in the circuit. 2) bumping into one another in such as way as to send pulses over long distances. The drift speed of individual electrons making up the current is 3) very low, about a snail's pace. 4) about the speed of sound. 5) about the speed of light.