The air resistance of falling is greatly affected by an object's frontal area and
A) mass.
B) weight.
C) speed.
Answer: C
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The reason that most extrasolar planets are found close to their parent stars is
A) the planets reflect more light the closer they are to the star. B) more of the starlight is blocked by the planet when it transits the star. C) the amount and frequency of the star's motion are both higher. D) the closer to a star, the hotter and therefore brighter the planet is. E) planets that are close to a star are heated up and therefore larger.
A 0.0040-kg lead bullet is traveling at a speed of 220 m/s when it embeds in a block of ice at 0°C. If all the heat generated goes into melting ice, what quantity of ice is melted? (Lf = 80 kcal/kg, the specific heat of lead = 0.03 kcal/kg/°C, and 1 kcal = 4 186 J)
a. 1.6E–2 kg b. 5.8E–4 kg c. 4.6E–3 kg d. 2.9E–4 kg e. 1.9E–5 kg
Which of the following is true about frictional forces?
a. They are stored as frictional potential energy. b. They can decrease kinetic energy. c. They can increase kinetic energy. d. They produce heat potential energy. e. They eventually convert to electromagnetic potential energy.
A spin-1/2 particle that does not interact via the strong interaction is a(n)
a. lepton b. baryon c. meson d. intermediate (or gauge) boson e. hadron