The phase angle of an LRC series circuit with a capacitive reactance of 40 ?, a resistor of 100 ? and a certain inductor at 1000 Hz is 40.0°. What is the value of the inductance in this circuit?
A) 11.8 mH
B) 124 mH
C) 212 mH
D) 61.9 mH
E) 19.7 mH
E
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In a Hertzsprung-Russell (H-R) diagram, a star is represented by a _____ on the graph that tells you its luminosity and temperature
A) cross B) broken line C) point D) dotted line
Dallas says that any change in velocity is directly proportional to the time interval over which the change took place. Dana says that is true only when the acceleration is constant. Which one, if either, is correct?
A.
B.
so that ?vx = ?t. C.
always is equal to 
.D.
E.
According to Galileo, the test of scientific truth is
A) experiment. B) philosophical discussion. C) evident patterns in nature. D) logic.
The vertical displacement y(x,t) of a horizontal string aligned along the x-axis is given by the equation
y(x,t) = (6.00 mm) cos[(3.25 m-1)x - (7.22 s-1)t]. What are the (a) wavelength and (b) period of this wave?