What protects Earth from the high energy particles ejected from the Sun (the solar wind)?
a. the troposphere
b. the stratosphere
c. the exosphere
d. the magnetosphere
e. the Van Allen radiation belts
Ans: d. the magnetosphere
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The greenhouse effect occurs because carbon dioxide is opaque to infrared radiation
a. True b. False Indicate whether the statement is true or false
A brass rod of length L 5 0.75 m is twisted by torques T until the angle of rotation between the ends of the rod is 3.58. The allowable shear strain in the copper is 0.0005 rad. The maximum permissible diameter of the rod is approximately:
(A) 6.5 mm
(B) 8.6 mm
(C) 9.7 mm
(D) 12.3 mm
In the M class stars, we find ________ absorption lines not seen in hotter stars
Fill in the blank(s) with correct word
Ice cream, when eaten, gives about 2100. Calories/kg to the body. On the other hand, the body must give back energy to warm it up to body temperature (37°C). Assuming ice cream has similar thermal properties to water:
(a) 1/2 kg produces how much energy? (b) 1/2 kg absorbs how much energy to reach 37°C? (c) What is the net gain or loss (eating 1/2 kg ice cream)?