Which of the following processes does not occur during the convective transfer of heat within a container of air? group of answer choices the cooler portion of the air surrounding a warmer part exerts a buoyant force on it. the flow of air molecules results in a flow of heat. as the warmer part of the air moves, it is replaced by cooler air that is subsequently warmed. a continuous flow of warmer and cooler parts of air is established. the volume of a warmed part of the air is reduced and its density increases.

A20 cm long spring is attached to a wall. the spring stretches to a length of 22 cm when you pull on it with a force of 100 n. what is the spring constant

Uranium has two naturally occurring isotopes. 238u has a natural abundance of 99.3% and 235u has an abundance of 0.7%. it is the rarer 235u that is needed for nuclear reactors. the isotopes are separated by forming uranium hexafluoride uf6, which is a gas, then allowing it to diffuse through a series of porous membranes. 235uf6 has a slightly larger rms speed than 238uf6 and diffuses slightly faster. many repetitions of this procedure gradually separate the two isotopes. what is the ratio of the rms speed of 235uf6 to that of 238uf6? express your answer to five significant figures.

What would be the radius of the earth if it had its actual mass but had the density of nuclei? express your answer to two significant figures and include the appropriate units.