The SI unit of electric charge is
a. e, the charge on the electron
b. the coulomb
c. the ampere
d. the ohm
e. the volt
B
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Rounding the number 200.601 to three significant figures
a. gives 199. b. gives 200. c. gives 200.601 d. gives 201. e. cannot be done.
Suppose that a steel bridge, 1000 m long, were built without any expansion joints. Suppose that only one end of the bridge was held fixed
What would the difference in the length of the bridge be between winter and summer, taking a typical winter temperature as 0°C, and a typical summer temperature as 40°C? The coefficient of thermal expansion of steel is 10.5 × 10-6K-1. A) 0.42 m B) 0.11 mm C) 0.11 m D) 0.42 mm E) 0.37 cm
Projectile Motion: A wind farm generator uses a two-bladed propeller mounted on a pylon at a height of 20 m, as shown in the figure. The width of the pylon is very narrow, and the length of each propeller blade is 12 m. A tip of the propeller breaks off just when the propeller is vertical. The fragment flies off horizontally, falls, and strikes the ground at point P with negligible air resistance. Just before the fragment broke off, the propeller was turning uniformly, taking 1.2 s for each rotation. How far is point P from the base of the pylon?
A. 120 m B. 130 m C. 140 m D. 150 m E. 160 m
After Mars, the next most likely candidates for life in the solar system are
A) comets in the Kuiper-belt. B) the large moons of the Jovian planets. C) the atmospheres of the Jovian planets. D) the largest asteroids. E) comets in the Oort cloud.