The synodic period of Venus is about how many Earth years?
A) about 5 years
B) about 3.5 years
C) about 2 years
D) about 1.25 years
E) about 0.7 years
B
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A 500-N weight sits on the small piston of a hydraulic machine. The small piston has area 2.0 cm2. If the large piston has area 40 cm2, how much weight can the large piston support?
A) 25 N B) 500 N C) 1000 N D) 10000 N E) 40000 N
In all cases the wire shown carries a current I. For which situation is the magnitude of the magnetic field maximum at the point P?
What makes refrigerators and air conditioners possible, in view of the second law of thermodynamics?
a. The fact that heat naturally moves from cooler regions to hotter ones. b. The addition of mechanical work to the system. c. The chance occurrences of heat flow from cooler to hotter systems. d. The use of electricity, not heat. e. The fact that no energy is wasted as heat in this kind of system.
Force on a Wire: The magnetic force on a current-carrying wire in a magnetic field is the strongest when
A. the current is in the direction of the magnetic field lines. B. the current is in the direction opposite to the magnetic field lines. C. the current is at a 180° angle with respect to the magnetic field lines. D. the current is perpendicular to the magnetic field lines. E. the current is at a 0° angle with respect to the magnetic field lines.