A magnetic dipole antenna is set up due west of a radio installation that utilizes an electric dipole antenna as a transmitter. What should the orientation of the antenna be used?
A. east-west
B. horizontal
C. north-south
D. Unable to answer given the information.
E. vertical
E. vertical
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A Styrofoam ice chest is 2 cm thick. If the inside of the chest is at 0ºC and outside the chest it is 25ºC, estimate the heat transfer by conduction through the Styrofoam per unit area.
What will be an ideal response?
The _____ is a measure of the rate of expansion of the Universe
A) Hubble constant B) Stefan-Boltzmann constant C) Boltzmann constant D) Planck constant
The following figures show a top view of Earth, sunlight, and six different positions of the Moon as it orbits Earth. Note that the distances shown are not drawn to scale. Rank each of the six lunar positions from left to right based on the amount of the Moon’s illuminated surface that is visible from Earth, from greatest to least. (If two diagrams have an equal amount of illumination as seen from Earth, put one on top of the other.)
100 grams of liquid nitrogen at 77 K is stirred into a beaker containing 200 grams of 5°C water. If the nitrogen leaves the solution as soon as it turns to gas, how much water freezes? (The heat of evaporation of nitrogen is 6.09 cal/gram and the heat of fusion of water is 80 cal/gram.)