A current loop is placed in a magnetic field as indicated. Will the loop tend to rotate (viewed from above) clockwise, counterclockwise, or not at all about a vertical axis?
A. clockwise
B. counter-clockwise
C. not at all
A. clockwise
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Each of the following lists two statements. Which two are the basic premises for the special theory of relativity?
A) (1) The laws of nature are the same for everyone. (2) The speed of light is the same for everyone. B) (1) The laws of nature are relative. (2) The speed of light depends on your viewpoint. C) (1) You can't go faster than the speed of light. (2) Time is different for different people. D) (1) Everything is relative. (2) You can never really tell who is moving.
The fastest we could accelerate a nuclear-powered rocket to is approximately
A) 50% of the speed of light B) 0.001% of the speed of light C) 0.1% of the speed of light D) 10% of the speed of light
The two men compete in a tug of war. Both pull equally and the scale reads 800 newtons. Each man must pull with a force of
1) 400 N. 2) 800 N. 3) 0 N. Consider action and reaction forces in this case: If action is the man on the left pulling on the rope, then the reaction force is 4) the rope pulling on the man on the left. 5) the rope pulling on the man on the right. 6) the man on the right pulling on the rope.
Electric power lines require convective cooling from the surrounding air to prevent excessive temperatures in the wire. If a 1 inch diameter line is wrapped with nylon to increase heat transfer with the surroundings, how much nylon can be wrapped around the wire before it begins to act as an insulator? The convective heat transfer coefficient is 5 Btu/hr?ft^2 ?ºF.
What will be an ideal response?