Ganymede and Callisto have densities suggesting they are made of rocky cores and mantles of
A) hydrogen.
B) iron.
C) liquid methane.
D) ammonia ice.
E) water or ice.
E
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A series LR circuit dissipates 60 W. The circuit is powered by a 120 V rms 60 Hz supply. If the current is 2.0 A rms, what is the phase constant?
A. 14
B. 25
C. 60
D. 70
E. 76
The speed of sound in air at 0
is 331 m/s. If the density of air is
then what is the bulk modulus of air?
A. 
B. 
C. 
D. 
E. 
Take the lens maker equation and show that a lens which has been turned around (surface 1 becomes 2 and 2 becomes 1 ) has the same focal length
What will be an ideal response?
If a bar magnet is falling through a loop of wire, the induced current in the loop of wire sets up a field which exerts a force on the magnet. This force between the magnet and the loop will be attractive when
a. the magnet enters the loop. b. the magnet is halfway through. c. the magnet is leaving the loop. d. never.