A bank vault is opened by applying a force of 140 N perpendicular to the plane of the door, 1.20 m from the hinges. Find the torque due to this force about an axis through the hinges
a. 117 N·m b. 308 N·m
c. 140 N·m d. 168 N·m
e. 154 N·m
d
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Given the Earth's larger size and strong gravity, the Earth's surface should have more impact craters than the Moon. However, it has very few. Why is this?
A) the Moon acted like a shield, protecting the Earth from most impacts B) the Earth's surface was almost completely molten during the Hadean Eon so no impact craters were formed C) almost all impacts occurred in the oceans so no impact craters were formed D) geological processes like plate tectonics, volcanism, and erosion have erased them
Frictional forces between a probe and a sample are measured with a variant of which microscope?
(a) An optical microscope (b) A SEM (c) A STM (d) An AFM
Provide a comparative analysis of Jupiter and Saturn. What are their similarities? What are their differences?
What will be an ideal response?
Significant Figures: Express the result of the following calculation, in scientific notation, to the proper number of significant figures: 
+ 19.
Fill in the blank(s) with the appropriate word(s).