When a microwave filter consisting of vertical parallel metal rods is in the absorbing position, oscillating currents are set up in the rods. At any one instant, the current in each rod has the same magnitude and direction. At that instant
a. the rods will try to move apart horizontally.
b. the rods will try to move together horizontally.
c. the rods will try to shift vertically upwards.
d. the rods will try to shift vertically downwards.
e. the rods will not be affected because the source of current is not a battery.
b
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The climatic zones of Pangaea ranged from
A) glaciation in the south, and a mild temperate climate in the north. B) cold, dry temperatures in the north, and warm, tropical temperatures in the south. C) humid uplands in the north, and drier, desert like conditions in the south. D) widespread glaciation in the north, and a warm, tropical climate in the south.
Most meteoroids--rocks moving through outer space--have been moving for billions of years. What, if anything, keeps them moving and why?
A) According to Newton's law of motion, their own acceleration keeps them moving. B) According to the law of inertia, nothing is needed to keep them moving. C) According to current theories about the creation of the universe, the big bang keeps them moving. D) According to Newton's law of gravity, the force of gravity keeps them moving. E) According to Newton's law of gravity, nothing is needed to keep them moving.
A brass rod with a length of 10.0 cm is placed end to end with an aluminum rod with a length of 30.0 cm and this system is placed between a hot temperature of 100
and a cold temperature of 10.0
The coefficient of thermal conductivities of the brass and the aluminum are 100 W/m C and 230 W/m
respectively. The rods have the same cross sectional area of 20.0 cm2. What is the heat flow from the hot temperature to the cold temperature?
A. 55.3 W B. 65.3 W C. 70.3 W D. 78.1 W E. 85.3 W
From laboratory measurements, we know that a particular spectral line formed by hydrogen appears at a wavelength of 486.1 nanometers (nm). The spectrum of a particular star shows the same hydrogen line appearing at a wavelength of 485.9 nm
What can we conclude? A) The star is moving toward us. B) The star is moving away from us. C) The star is getting hotter. D) The star is getting colder. E) The "star" actually is a planet.