Is aging primarily an example of a physical or chemical change?
A) Aging is an example of a physical change since it involves our physical bodies getting older each day.
B) Aging is an example of a chemical change involving the chemical reformation of our biomolecules.
C) Aging cannot be classified as either a physical or chemical change.
D) None of the above is true.
Answer: B
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Slanting Surfaces Without Friction: A system consisting of blocks, a light frictionless pulley, a frictionless incline, and very light connecting wires is shown in the figure. The wires pull on the left-hand blocks parallel to the surface of the ramp. The 9.0-kg block accelerates downward when the system is released gently from rest.(a) What is the magnitude of the acceleration of the 9.0-kg block?(b) What is the tension in the wire connecting the two blocks on the incline?
What will be an ideal response?
From hottest to coolest, the order of the spectral types of stars is
A) OBAFGKM. B) OBAGFKM. C) ABFGKMO. D) OMKGFBA. E) ABCDEFG.
The great contribution of Tycho Brahe was to
A) observe planetary positions with sufficient accuracy that later enabled Kepler to discover the laws of planetary motion. B) discover four moons orbiting Jupiter, thereby lending strong support to the idea that the Earth is not the center of the universe. C) offer the first detailed model of a Sun-centered solar system, thereby beginning the process of overturning the Earth-centered model of the Greeks. D) discover that planets orbit the Sun in elliptical orbits with varying speed.
A person consumes 2 200 kcal/day while expending 3 200 kcal/day. In a month's time, about how much weight would this person lose if the loss were essentially all from body fat? (Body fat has an energy content of about 4 100 kcal per pound.)
a. 15 pound b. 22 pounds c. 7.3 pounds d. 3.7 pounds e. 29 pounds