Suppose Einstein had never lived and did not publish the special theory of relativity in 1905. According to most historians of science, when would someone else have discovered the theory?
A) within a year
B) in about 10 to 20 years
C) in about 50 years
D) We still wouldn't know about it today.
E) If Einstein hadn't lived, space and time would be very different, and the theory would have been discovered by the ancient Greeks.
A
Al is floating freely in her spacecraft, and you are accelerating away from her with an acceleration of 1g.
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Strong epidemiologic evidence that cigarette smoking was a major case of heart disease existed long before there was any biological evidence.
a. true b. false
A ball with a diameter of 20.00 cm is placed in water with 75% of its volume out of the water. The buoyant force of the water on the ball is
A. 16.67 N. B. 14.75 N. C. 13.60 N. D. 12.56 N. E. 10.26 N.
Earth's radius is about
a. 3600 km. b. 5800 km. c. 6400 km. d. 4400 km.
Thermal Expansion: A brass rod is 69.5 cm long and an aluminum rod is 49.3 cm long when both rods are at an initial temperature of 0° C. The rods are placed in line with a gap of 1.2 cm between them, as shown in the figure. The distance between the far ends of the rods is maintained at 120.0 cm throughout. The temperature of both rods is raised equally until they are barely in contact. At what temperature does contact occur? The coefficients of linear expansion of brass and aluminum are 2.0 × 10-5 K-1 (brass) and 2.4 × 10-5 K-1 (aluminum). 
A. 470°C B. 440°C C. 420°C D. 490°C E. 510°C