Volumetric expansion coefficients of simple materials are often well cataloged. however, the thermal expansion coefficient β of a human body is less well known. this could affect the human body's specific gravity and, therefore, measurements of its body‑fat ratio. suppose that a human body of weight w0 on dry land is placed on a scale while completely immersed in formaldehyde of temperature t1. once the temperature increases by, δt, the scale reading drops by δw. derive an expression for β in terms of δt, w0, and δw by assuming that the ratio of the density of formaldehyde rhof and the initial density of the body rhob is r=rhof/rhob. assume also that rhof does not change when heated.

In a laboratory experiment, a fermenting aqueous solution of glucose and yeast produces carbon dioxide gas and ethanol. the solution was heated by burning natural gas in a bunsen burner to distill the ethanol that formed in the flask. during the distillation, the ethanol evaporated and then condensed in the receiving flask. the flame of the burner was kept too close to the bottom of the flask and some of the glucose decomposed into a black carbon deposit on the inside of the flask. during this experiment the following changes occurred. which of these changes involved a physical change and not a chemical change? check all that apply. 1-condensation of ethanol 2-evaporation of ethanol 3- formation of carbon dioxide gas from glucose burning of natural gas 4-formation of ethanol from glucose by yeast 5-formation of a carbon deposit inside the flask

At 300 mm hg, a gas has a volume of 380 l, what is the volume at standard pressure

If we compare and contrast electromagnetic waves with sound waves, all but one statement is true. that is a) sound waves require a medium to travel while electromagnetic waves do not. b) electromagnetic waves can travel through the vacuum of space while sound waves cannot. c) electromagnetic waves must have a medium in which to travel, but sound waves can travel anywhere. eliminate d) sound waves must bounce off of matter in order to travel while electromagnetic waves do not require matter to be present.