How has Earth's interior remained warm over its geological history?
A. the greenhouse effect
B. tidal stresses from the Moon
C. Earth's proximity to the Sun
D. leftover heat from formation
E. radioactive decay
Answer: E
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Torque: A flat circular loop of wire is in a uniform magnetic field of 0.30 T. The diameter of the loop is 1.0 m, and a 2.0-A current flows in it. What is the magnitude of the magnetic torque on the loop when the plane of the loop is parallel to the magnetic field?
A. 0.00 N ? m B. 0.41 N ? m C. 0.47 N ? m D. 0.52 N ? m
Acceleration: If the velocity of an object is zero at some point, then its acceleration must also be zero at that point.
A. True B. False
A speedy tortoise can run with a velocity of 10.0 cm/s and a hare can run 20.0 times as fast. In a race, they both start at the same time, but the hare stops to rest for 2.00 minutes. The tortoise wins by a shell (20.0 cm). What was the length of the race?
What will be an ideal response?
A pressure of 2.0 × 10^-7 mm of Hg is achieved in a vacuum system. How many gas molecules are present per liter volume if the temperature is 293 K? (760 mm of Hg = 1 atm, R = 0.0821 L • atm/mol • K, and NA = 6.02 × 10^23)
a. 16 × 10^18 c. 3.3 × 10^12 b. 6.6 × 10^12 d. 3.4 × 10^9