If all people, animals, trains and trucks all over the world began to walk or run towards the east (opposite the direction of Earth's spin), then
A) Earth would spin a bit faster.
B) Earth would spin a bit slower.
C) Earth's spin would not be affected at all.
Answer: B
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An electric heating blanket is subjected to an acceptance test. It is to dissipate 400 W on the high setting when hanging in air at 20°C. (a) If the blanket is 1.3-m-wide: what is the length required if its average temperature at the high setting is to be 40°C, (b) If the average temperature at the low setting is to be 30°C, what rate of dissipation is possible?
GIVEN
• An electric blanket hanging in air
• Heat dissipation rate (qh) = 400 W
• Air temperature (T?) = 20°C
• Blanket width (w) = 1.3 m
• Average temperatures ? High (Tsh) = 40°C
? Low (Ts1) = 30°C
FIND
(a) The length of the blanket (L) (b) Heat dissipation rate on the low setting (q1) ASSUMPTIONS
• Air is still
• Moisture in the air has a negligible effect
• Blanket is hung vertically with its 1.3 m sides vertical
SKETCH
PROPERTIES AND CONSTANTS
for dry air at the mean temperatures for the two settings
Who first determined that the energy/s emitted by (luminosity of) Cepheid variable stars is larger the longer their period of variation is?
a. Henrietta Leavitt b. Edwin Hubble c. John Glenn d. Carl Sagan e. Harlow Shapley
Asteroids which could possibly collide with the Earth at some time in the future are known as
A) killer asteroids B) Earth-crossing asteroids C) Armageddon asteroids D) potentially hazardous asteroids
Describe the various ways that stellar masses can be determined in binary star systems
What will be an ideal response?