Uma wants to recreate the discovery of superconductivity. Which describes the materials needed? A) a tool to increase temperatures, copper, resistance, a tool to measure electric current
B) a tool to drop temperatures, mercury, an electric current, and a tool to measure resistance
C) a tool to drop temperatures, mercury, resistance, a tool to measure electric current
D) a tool to increase temperatures, copper, an electric current, and a tool to measure resistance

Apackage of supplies is dropped from a plane, and one second later a second package is dropped. neglecting air resistance, the relative velocity of the 1st package viewed from the second will 56) a) increase. b) be constant. c) be zero. d) depend upon their weight. e) decrease

How will the system respond to a temperature increase?

Imagine that you have two balloons (or, better yet, actually inflate two balloons, if possible). create static electricity around one of the balloons by rubbing it against your hair or your sweater and then bring that balloon close to the other balloon, which has not been charged. try this with at least one other object—and for variety in the discussion, avoid using an object already described by your classmates. then, for your initial post to the discussion, answer the following questions: what happened with the two balloons?