If the Sun instantaneously shrunk dramatically in size but retained the same mass, what would happen to the Earth?
A) Earth's orbit would be unchanged.
B) Earth would gradually spiral into the shrunken Sun.
C) Earth would be ejected from the solar system.
D) Earth would be rapidly sucked into the shrunken Sun.
A) Earth's orbit would be unchanged.
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In the context of the Sun's surface glowing when hot, yellow-hot is hotter than red-hot but not as hot as white-hot
Indicate whether the statement is true or false
The top of a 30 cm I-beam is maintained at a temperature of 260°C, while the bottom is at 93°C. The thickness of the web is 1.25 cm. Air at 260°C is blowing along the side of the beam so that h= 40 W/(m2 K). The thermal conductivity of the steel may be assumed constant and equal to 43 W/(m K). Find the temperature distribution along the web from top to bottom and plot the results.
GIVEN
FIND
The temperature distribution along the web and the plot the results
ASSUMPTIONS
The thermal conductivity of the steel is uniform
The beam has reached steady state conditions
One dimensional through the web
The beam is very long compared to the web thickness
SKETCH
William Herschel thought he had found a comet when he spotted the green disk of:
A) Triton. B) Uranus. C) Neptune. D) Titania. E) Oberon.
Transformers: The primary coil of an ideal transformer has 100 turns and its secondary coil has 400 turns. If the ac current in the secondary coil is 2 A, what is the current in its primary coil?
A. 2 A B. 8 A C. 1/2 A D. 1/4 A E. 4 A