Heat energy is measured in units of
A) degrees.
B) joules.
C) calories.
D) both joules and calories.
Answer: D
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What process best explains the observed pattern of abundances of elements with atomic numbers between 6 and 20?
A) radioactive decay of nuclei with odd numbers of protons B) fusion reactions with hydrogen nuclei C) fusion reactions with helium nuclei D) fusion reactions with neutrons
Which of the following statements does not use the term angular size or angular distance correctly?
A) The angular distance between those two houses in the distance is 30 degrees. B) The angular distance between those two bright stars in the sky is about 2 meters. C) The angular size of the Sun is about the same as that of the Moon. D) You can use your outstretched hand against the sky to estimate angular sizes and angular distances.
A high-voltage power line 20 m above the ground carries a current of 5000 A. What is the magnetic field due to the current directly underneath the power line? (µ0 = 4p × 10^-7 T×m/A)
a. 14 mT c. 20 µT b. 35 µT d. 50 µT
Tensile Stress and Strain: Which one of the following is an accurate statement?
A. The ratio of tensile stress to tensile strain is called Young's modulus. B. "Strain" has a meaning very close to "force." C. "Stress" has a meaning very close to "stretch." D. Tensile stress is measured in newtons. E. Tensile strain is measured in meters.