A boulder and a stone in free fall have equal accelerations because the
A. ratio of force to mass is the same.
B. air resistance is always zero in free fall.
C. force due to gravity is the same on each.
D. inertia of each is the same.
Answer: A
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The blue part of a flag will appear black when illuminated with
A. cyan light. B. yellow light. C. blue light. D. none of the above
Which of the following describes the cause of a mirage?
A. thin layer of moist air near the ground B. reflection of light from a hot surface C. bending of light by air of different densities D. scattering of light by air molecules
What community has the highest biomass per unit of surface area?
a. Rocky intertidal b. Estuary c. Sandy beach d. Deep ocean
India has been colliding with Asia for roughly 50 million years, a process that has uplifted the Tibetan Plateau. However, although the margin of Asia has been intensely deformed, India has remained largely intact. Why is this the case?
A) Asia's margin is composed of soft materials such as shale and sandstone B) There is a mantle plume beneath the Asian continent that softens the plate, permitting deformation C) Asia's rocks are over 2 billion years old and are so dense they are sinking back into the mantle D) Most of India is tough, durable, ancient shield material and is harder than the newer Asian material