A ball bearing rolls along a smooth horizontal tabletop, and crashes head-on into a second ball bearing of half its mass. If both ball bearings roll in the x-direction only (either positive or negative) and the initially stationary ball bearing is observed to have a velocity of +2.4 m/s after the collision, what was the initial speed of the first ball bearing?
A. More information is required
B. 7.2 m/s
C. 3.6 m/s
D. 1.8 m/s
D. 1.8 m/s
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The estimated age of the Milky Way Galaxy is about ________.
A. 4.6 billion years B. 13 billion years C. 100,000 years D. 20 billion years
In the periphery of our vision, we are
A) more sensitive to low frequencies than high ones. B) insensitive to color and movement. C) sensitive to movement, but cannot see color. D) sensitive to both movement and color. E) none of the above
Two moons orbit a planet in nearly circular orbits. Moon A has orbital radius r, and moon B has orbital radius 4r
Moon A takes 20 days to complete one orbit. How long does it take moon B to complete an orbit? A) 20 days B) 40 days C) 80 days D) 160 days E) 320 days
Why do our best radar maps of Venus come from the Magellan space probe?
What will be an ideal response?