Why can't you directly observe, with the unaided eye, Brownian motion in easily visible objects such as floating bits of paper?
A) Because atoms are so small that you can't see them with the unaided eye.
B) Because only individual atoms and molecules exhibit Brownian motion.
C) Because bits of paper are so massive [or heavy] that they do not respond noticeably to atomic impacts.
D) Because paper cannot be electrically charged, so it cannot respond to Brownian forces by individual atoms.
E) Because only living organisms such as bacteria exhibit Brownian motion.
C
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Why do models suggest that Uranus and Neptune formed elsewhere?
A) We do not have very good models. B) The density of materials was too low in their current orbits for the ice giants to have formed there. C) Jupiter and Saturn took up most of the material in the area; Uranus and Neptune must have formed elsewhere. D) It is too cold at their current locations for the ice giants to have formed there.
What is the temperature increase of 3.00 kg of water when heated by a 900-W immersion heater for 9.00 min? (cw = 4 186 J/kg/°C)
a. 77.4°C b. 48.4°C c. 38.7°C d. 19.4°C e. 0.645°C
Arrange the temperatures 40 ºF, 40 ºC, and 40 K from highest to lowest
a. 40 ºF, 40 ºC, 40 K b. 40 ºC, 40 K, 40 ºF c. 40 ºF, 40 K, 40 ºC d. 40 ºC, 40 ºF, 40 K
A 4.0-kg block slides down a 35° incline at a constant speed when a 16-N force is applied acting up and parallel to the incline. What is the coefficient of kinetic friction between the block and the surface of the incline?
a. 0.20 b. 0.23 c. 0.26 d. 0.33 e. 0.41