If the calorimeter is not well insulated, how will heat from the air in the laboratory affect the experimental value for the latent heat of vaporization?
A heat loss from the calorimeter cup will take place. Part of the heat energy from the
steam will be lost, and the value for the heat of vaporization calculated will be
lowered.
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A particular gray body surface has absorptivity of 0.35 and reflectivity of 0.45. What is its emissivity and transmissivity?
What will be an ideal response?
An athlete can perform a certain number of pushups. The same athlete scaled up in size can do
A) fewer pushups. B) the same number of pushups. C) more pushups.
In a liquid at a given temperature, the molecules are moving in every direction, some fast, some slowly. Electrical forces of adhesion tend to hold them together
However, occasionally one molecule gains enough energy (as a result of collisions) so that it pulls loose from its neighbors and escapes from the liquid. Which of the following can best be understood in terms of this phenomenon? A) Increasing the atmospheric pressure over a liquid will cause the boiling temperature to decrease. B) If snow begins to fall when you are skiing, you will feel colder than you did before it started to snow. C) When a large steel suspension bridge is built, gaps are left between the girders. D) When you step out of a swimming pool and stand in the wind, you will get colder than you would if you stayed out of the wind. E) A hot water bottle will do a better job of keeping you warm than will a rock of the same mass heated to the same temperature.
Uranus' moon Ariel shows considerable surface activity, a surprise considering its small size
Indicate whether the statement is true or false