A furlong is a distance of 220 yards. A fortnight is a time period of two weeks. A horse is running at a speed of 4.00 yards per second. What is his speed in furlongs per fortnight?
a. 2200 furlongs/fortnight
c. 11,000 furlongs/fortnight
b. 4980 furlongs/fortnight
d. 22,000 furlongs/fortnight
D
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According to Heisenberg's uncertainty principle, electrons are more unpredictable than protons. This is because electrons
A) are negatively charged rather than positively charged. B) interact more strongly with other particles. C) have a smaller mass. D) have a smaller volume E) interact more weakly (i.e., less strongly) with other particles.
Magnetic Poles: A straight bar magnet is initially 4 cm long, with the north pole on the right and the south pole on the left. If you cut the magnet in half, the right half will
A. contain only a north pole. B. contain a north pole on the right and a south pole on the left. C. contain only a south pole. D. no longer contain any poles.
Mass and weight on Earth's surface
a. are the same thing. b. are defined solely by inertia. c. are explained by Newton's third law. d. differ in magnitude by a constant. e. are explained by Kepler's second law.
A 55-cm steel rod has a diameter of 30 cm. The compressive strength of steel is 500 × 106 N/m2. What is the compression force that would break the rod?
A) 3.5 × 107 N B) 2.4 × 107 N C) 1.4 × 108 N D) 4.7 × 108 N E) 8.9 × 108 N