A planet is detected via the Doppler method. What does the time between peaks of the stellar velocity tell us?
A) the planet's size
B) the planet's mass
C) the planet's density
D) the orbital period of the planet
E) the orbital eccentricity of the planet
D) the orbital period of the planet
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In an RL series circuit connected to a dc source and a switch, the inductor gets 40% of its maximum current 1.8 s after the switch is closed at t = 0 s. What is the time constant of this circuit?
A) 0.80 s B) 1.5 s C) 2.5 s D) 3.5 s E) 5.5 s
The silver lining on the glass surfaces of a Thermos bottle reduces energy that is transferred by
A) conduction. B) convection. C) radiation. D) friction. E) none of the above
The electric field shown is produced by a single point charge at the center of the picture
 What type of charge produces the electric field shown? a. positive b. negative c. neutral d. impossible to tellTwo moles of nitrogen gas are contained in an enclosed cylinder with a movable piston. If the molecular mass of nitrogen is 28.0, how many grams of nitrogen are present?
a. 0.140 b. 56.0 c. 42.0 d. 112