An athlete doing push-ups performs 650 kJ of work and loses 425 kJ of thermal energy through heating. What is the change in the internal (thermal) energy of the athlete?
A) -225 kJ
B) -1075 kJ
C) 1075 kJ
D) 225 kJ
E) 276 kJ
B
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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.
Which carbohydrate cannot be digested by humans as a direct source of energy?
a. Fructose b. Glucose c. Sucrose d. Cellulose e. Starch
Using the Bohr model, what is the radius of the lowest-energy electron orbit in a singly-ionized He atom, which has 2 protons? (r1 = 0.0529 nm for hydrogen)
What will be an ideal response?
The modified form of Kepler's Third law allows astronomers to determine the Milky Way's ________.
A. shape B. composition C. number of spiral arms D. mass E. age