A circuit breaker is connected in ______________ in a circuit
Fill in the blank(s) with correct word
series
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A thin metallic shell of radius 40 cm has a charge of -25 nC on it. At the center of the sphere is a point charge of 35 nC. What is the electric field 15 cm from the center of the shell?
a. 
b. 
c. 
d. 
e. 
How do typical wind speeds in Jupiter's atmosphere compare to typical wind speeds on Earth?
A) They are much faster than hurricane winds on Earth. B) They are about the same as average winds on Earth. C) They are slightly faster than average winds on Earth. D) They are slightly slower than average winds on Earth.
What change slowly occurs during the main-sequence lifetime of a star?
A) As hydrogen is used up in the core, the fusion rate decreases and reduces the luminosity. B) It gathers more gas from interstellar space, increasing its mass and hence the luminosity. C) Its core temperature slowly increases, increasing the fusion rate and hence the luminosity. D) As the solar wind blows material into space, the decreasing mass reduces pressure in the core, which in turn reduces the fusion rate and the luminosity.
The frictional force, due to air resistance, acting on an object is always
A. in the direction of the object's motion. B. in the upward direction. C. greater than the net force. D. smaller than object's weight. E. in the opposite direction to the object's motion.