A copper penny has a mass of 3.0 g. A total of 4.0 × 1012 electrons are transferred from one neutral penny to another
If the electrostatic force of attraction between the pennies is equal to the weight of a penny, what is the separation between them? A)
31 cm
B)
33 cm
C)
35 cm
D)
37 cm
E)
39 cm
C
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In a contest, two tractors pull two identical blocks of stone the same distance over identical surfaces. However, block A is moving twice as fast as block B when it crosses the finish line. Which statement is correct?
a. Block A has twice as much kinetic energy as block B. b. Block B has lost twice as much kinetic energy to friction as block A. c. Block B has lost twice as much kinetic energy as block A. d. Both blocks have had equal losses of energy to friction. e. No energy is lost to friction because the ground has no displacement.
Size of the Nucleus: How many nucleons would you expect a nucleus to contain if its diameter is 13.4 fm?
Fill in the blank(s) with the appropriate word(s).
If a piece of iron and a cup of water at the same temperature are heated so the internal energy of each doubles
A) the water will have the higher temperature. B) the iron will have the higher temperature. C) both will have the same temperature. D) need more information
An example of an action at a distance force is
a. tension b. weight c. static friction d. kinetic friction e. none of the above