What key process underlies why Mars changed so much from its early conditions to its conditions today?
a. Outgassing.
b. Interior cooling.
c. Slowing of its rotation rate.
d. Evaporation of its ocean.
Answer : b. Interior cooling.
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Charge of uniform density (0.30 nC/m2) is distributed over the xy plane, and charge of uniform density (–0.40 nC/m2) is distributed over the yz plane. What is the magnitude of the resulting electric field at any point not in either of the two charged planes?
a. 40 N/C b. 34 N/C c. 28 N/C d. 46 N/C e. 6.0 N/C
State the law of conservation of total energy
What will be an ideal response?
A batter hits a foul ball. The 0.14-kg baseball that was approaching him at 40 m/s leaves the bat at 30 m/s in a direction perpendicular to the line between the batter and the pitcher. What is the magnitude of the impulse delivered to the baseball?
A) 1.4 N ? s B) 3.5 N ? s C) 5.6 N ? s D) 9.8 N ? s E) 7.0 N ? s
When can Sirius, a favorite star of the Northern Hemisphere, be observed?
a. during summer b. during spring c. all year long d. during winter e. during fall