In 1869, a major event in the history of chemistry occurred; it was the
a. discovery of the law of definite proportions.
b. discovery of the octet rule.
c. discovery of the law of conservation of mass.
d. development of the periodic table.
d
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A block of metal weighs 40 N in air and 30 N in water. What is the buoyant force on the block due to the water? The density of water is 1000 kg/m3
A) 10 N B) 30 N C) 40 N D) 70 N
Of the known planets in our solar system, the innermost is Mercury. When compared to the other planets in the system, Mercury has:
a. the greatest centripetal acceleration. c. the smallest speed. b. the greatest period of revolution. d. none of the above properties.
Which one of the following is correct for the energy of a 620 nm beam of light?
A) 1.60 × 10-19 eV B) 2.10 × 10-19 J C) 3.21 × 10-19 J D) 1.60 × 10-18 eV E) 3.21 × 10-18 eV
A straight 10-cm wire bent at its midpoint so as to form an angle of 90° carries a current of 10 A. It lies in the xy plane in a region where the magnetic field is in the positive z direction and has a constant magnitude of 3.0 mT. What is the magnitude of the magnetic force on this wire?
a. 3.2 mN b. 2.1 mN c. 5.3 mN d. 4.2 mN e. 6.0 mN