Which of the following is not one of the five major divisions of chemistry?
a. Nuclear chemistry
b. Physical chemistry
c. Biochemistry
d. Inorganic chemistry
a
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A length of piano wire is used to hang a mass from the ceiling. If the total mass of the string is 0.72 g and the mass hung from it is 1850 g, what is the length of the wire, assuming the fundamental frequency when plucked in these circumstances is 1280 Hz?
A. 2.48 cm B. 6.15 cm C. 3.08 cm D. 1.54 cm
According to the nebular theory of solar system formation, which law best explains why the solar nebula spun faster as it shrank in size?
A) the law of conservation of angular momentum B) the law of conservation of energy C) the law of universal gravitation D) Einstein's law E = mc2
How does the heat Jupiter radiates compare to the energy it receives from the Sun?
A) They are equal, as you would expect for a highly reflective planet. B) Jupiter's dark belts absorb most of the solar radiation, so it is cooler in the infrared. C) Jupiter radiates back into space about twice the energy it gets from the Sun. D) Jupiter is a brown dwarf, about a hundred times less luminous than the Sun. E) Jupiter is a red dwarf, about a tenth the Sun's luminosity.
At what speed would a proton need to circle the Earth at a height of 1 000 km above the equator if the Earth's magnetic field is horizontal and directed north-south, with an intensity of 4.00 × 10^-8 T? (The radius of the Earth is 6 400 km and the charge and mass of the proton are q = 1.60 × 10^-19 C and mp = 1.67 × 10^-27 kg. Ignore relativistic corrections.)