Which of Jupiter's moons is believed to be covered with water ice and possibly have life sustaining conditions?
a. Io
b. Europa
c. Ganymede
d. Callisto
b
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The half life of uranium-232 is 70 years. The time for 3/4 of a sample of uranium-232 to decay is __________
Fill in the blank(s) with correct word
Most of the time, planets are observed to
A) be stationary with respect to background stars B) move eastward with respect to background stars C) move due south with respect to background stars D) move westward with respect to background stars
A girl pushes a cart to the left with a 100-N force. At the same time a boy pushes it to the right with a 50-N force. The net force exerted on the cart is
A) 50 N to the left. B) 50 N to the right. C) 100 N to the left. D) 100 N to the right.
Current technology is in the process of developing electronic circuit elements with distances between elements of only
A. nanometers. B. millimeters. C. microns. D. picometers.