Explain whether a force is needed to keep a satellite orbiting at constant speed around the Earth and why or why not.
What will be an ideal response?
Answers may vary.
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Evidence for the Big Bang is
A. the slowing down of galaxies as they recede. B. the long wavelength radiation that permeates the universe. C. both of these D. neither of these
Which of the following best describes the human population from early times to the present?
A) early rapid growth, which has increased rapidly in the last 20 years B) early rapid growth, which has leveled off to a nearly constant rate in the last 20 years C) slow, uneven growth until the 1800s, then increasingly rapid growth D) rapid, explosive growth throughout the period E) slow, steady growth throughout the period
Respiration involves
A) the use of heat energy to react carbon dioxide with water to produce oxygen. B) a chemical reaction between carbohydrates and oxygen to produce carbon dioxide, water, and heat energy. C) a photochemical reaction involving carbon dioxide and water to produce carbohydrates and oxygen. D) a photochemical reaction involving carbon dioxide and oxygen to produce water and oxygen.
Lake Victoria in Africa is one of the largest inland waters of the world, surpassed only by the Caspian Sea and Lake Superior
Indicate whether the statement is true or false