How many moles of air must escape from a 15.0-m × 9.0-m × 6.0-m room when the temperature is raised from 10.0°C to 20.0°C? Assume the pressure remains unchanged at one atmosphere while the room is heated. (R = 8.31 J/mol/K)
a. 4.9E+3 moles
b. 1.2E+3 moles
c. 2.2E+2 moles
d. 7.9E+2 moles
e. 5.0E+3 moles
b
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An athlete throws a ball with a velocity of 40 m/s at an angle of 20° above the horizontal. Which of the following statements is true in this case?
A) The vertical component of the velocity remains constant. B) The horizontal component of the velocity changes. C) The vertical component of the velocity changes sign after the ball attains its maximum height. D) The horizontal component of the velocity changes sign after the ball attains its maximum height. E) None of the given choices is correct.
A mercury-in-glass thermometer reads 20ºC when hanging outside in the shade on a calm summer day. Another thermometer hangs in a sunny location and registers 45ºC. Assuming a convective heat transfer coefficient of 10 W/m^2? K and the emissivity is 0.2 for both thermometers, determine the effective surrounding surface temperature in the sun.
What will be an ideal response?
Can an element decay "forward" in the periodic table, to a higher atomic number?
A) No, in fact elements cannot alter their atomic number by radioactive decay. B) No, but an element can decay to a lower atomic number. C) Yes, by alpha decay. D) Yes, this can occur by means of both beta decay and alpha decay. E) Yes, by beta decay.
The direction of a field line at a point in space shows the direction of the force that would act on a body placed at the point
Indicate whether the statement is true or false