Addition by Components: Three ropes are tied in a knot as shown in the figure. One student pulls on rope A with 1.0 pound of force, and another student pulls on rope B with 7.0 pounds of force. How hard and in what direction must you pull on rope C to balance the first two pulls? Give the direction by specifying the angle (clockwise or counterclockwise) of the pull with the direction of rope A.
What will be an ideal response?
6.6 lb at 68° clockwise from rope A
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The diagram below shows five thin cylindrical shells, each shell rotating with constant angular velocity about its central axis. The magnitude of the tangential speed of one point of each cylinder is shown, along with each cylinder's radius and mass. Which cylindrical shell has the largest angular momentum?
a.
b.
Strictly speaking, if a beam of white light is shone through a piece of very thick glass, the first color to emerge from the other side is
1) white. 2) violet. 3) red. 4) green. This is because 5) all frequencies travel at c. 6) lower frequencies undergo more refraction in a medium. 7) higher frequencies of light travel at a faster average speed through a medium. 8) higher frequencies of light interact with more molecules in a medium.
The internal energy of n moles of an ideal gas depends on
a. one state variable T. b. two state variables T and V. c. two state variables T and P. d. three state variables T, P and V. e. four variables R, T, P and V.
If a vector pointing upward has a positive magnitude, a vector pointing downward has a negative magnitude
A) True B) False