Complete the following sentence: "The moment of inertia of an object
1.depends on the rotational speed of the object."
2.will be greater for a larger-massed object than for a smaller-massed object."
3.is not a function of the object's mass."
4.is a function of the axis about which the object is spun."
4
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Ideal Gas Law: If a certain sample of an ideal gas has a temperature of 104°C and exerts a pressure of 2.3 × 104 Pa on the walls of its container, how many gas molecules are present in each cubic centimeter of volume? The ideal gas constant is R = 8.31 J/mol × K and Avogadro's number is NA = 6.022 × 1023 molecules/mol.
Fill in the blank(s) with the appropriate word(s).
Why do some quasars have redshifts greater than 1?
A) They are made of different elements than any other objects in the universe. B) They are very distant, with relativistic redshifts that take into account dilation of space-time, as Einstein predicted. C) They are made of tachyons and thus are able to move away from us faster than the speed of light. D) Einstein proved it is impossible to have a redshift greater than 1; these are all due to gravitational lensing tricking us. E) They are moving towards us, which throws off our spectrometers.
Angela claims that she wears a cylindrical-shaped hollow gold bracelet because it expands less than a solid one with a change in temperature. Clarissa claims that a cylindrical-shaped solid gold bracelet expands less than a hollow one. Which one, if either, is correct?
a. Angela, because the bracelet expands outward on its outer surface and inward on its inner surface. b. Clarissa, because the bracelet expands outward on its outer surface and inward on its inner surface. c. Angela, because the inner circumference does not change, but the outer circumference expands. d. Clarissa, because the inner circumference does not change, but the outer circumference expands. e. Neither, because both the inner and outer circumferences increase in length.
Perihelion, the near point to the Sun for the Earth in its orbit, occurs in January. In which of the following months is the orbital angular momentum of the Earth the greatest?
a. only in January b. only in July c. in both April and October, but in no other months d. None of the above answers is correct.