Which of the following is not a conserved quantity?
A) energy
B) momentum
C) angular momentum
D) radiation
D) radiation
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The mercury in a thermometer has a volume of 0.516 milliliters and a mass of 2.8 grams. What is its density?
A. 4.52 g/mL B. 5.43 g/mL C. 6.72 g/mL D. 7.31 g/mL
What helps explain the fact that neutrons rather than protons make the nucleus of a heavier element more stable?
a. The gravitational force of the neutrons attracts all other nucleons, but a proton can also repel other nucleons with the same charge. b. The weak force in the nucleus of a heavy element is balanced by the presence of more neutrons. c. The strong force for between a neutron and another nucleon is much stronger than between a proton and a proton. d. The strong force exerted by both neutrons and protons acts between neighboring nucleons, while the electrostatic repulsion between protons has longer range. e. The strong force increases as the element gets heavier, which makes it harder for protons to join the nucleus.
Why might we think that silicon would be an obvious alternative to carbon as a building block for biological molecules?
A) it forms the basis of some life forms on Earth B) it has a similar abundance on Earth to carbon C) it forms complex molecules like carbon D) it has a similar electronic structure to carbon, forming a maximum of four bonds and, hence, should have a similar chemistry
While running, a person dissipates about 0.6 J of mechanical energy per step per kilogram of body mass. If a 60-kg person runs with a power of 70 Watts during a race, how fast is the person running? Assume a running step is 1.5 m long