A horizontal disk with a radius of 10 cm rotates about a vertical axis through its center. The disk starts from rest at t = 0 and has a constant angular acceleration of 2.1 rad/s2 . At what value of t will the radial and tangential components of the linear acceleration of a point on the rim of the disk be equal in magnitude?
a. 0.55 s
b. 0.63 s
c. 0.69 s
d. 0.59 s
e. 0.47 s
c
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Oxygen molecules are 16 times more massive than hydrogen molecules. At a given temperature, the average molecular kinetic energy of oxygen, compared to hydrogen,
A) is greater. B) is less. C) is the same. D) cannot be determined since pressure and volume are not given.
When a fixed amount of ideal gas goes through an isobaric expansion
A) its internal (thermal) energy does not change. B) the gas does no work. C) no heat enters or leaves the gas. D) its temperature must increase. E) its pressure must increase.
A Styrofoam spherical container having a 1 inch thick wall and 2 foot diameter holds dry ice (solid carbon dioxide) at -85ºF. If the outside temperature is 60ºF, estimate the heat gain in the container and establish the temperature distribution through the 1 inch wall.
What will be an ideal response?
Why does the Milky Way appear as a bright band from Earth?
A: Because it's a band type galaxy. B: Because it would look like a beautiful spiral if we could see it the ultraviolet. C: Because it would look like a beautiful spiral if it weren't for the dust. D: Because we are inside it and looking through the disk. E: Because it's really steam coming out of the Teapot (the asterism in Sagittarius).