Two small electrically charged objects are placed 6 centimeters (cm) apart, where they exert a force of 8 N on each other. How far apart must they be placed in order to exert a force of 2 N on each other?
A) 3 cm B) 9 cm C) 12 cm D) 18 cm E) 24 cm
C
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Two bodies with masses m1 and m2 are both moving east with velocities of magnitudes v1 and v2, where v1 is less than v2 . The magnitude of the velocity of the center of mass of this system of two bodies is
a. less than v1. b. equal to v1. c. equal to the average of v1 and v2. d. greater than v1 and less than v2. e. greater than v2.
Thunderstorms are most associated with which of the following?
What will be an ideal response?
Which is lightest in weight?
A) oxygen atom B) water molecule C) electron D) hydrogen atom E) proton
Estimate the time required to melt a 5-mm sheet of ice on an aircraft wing if the wing surface is heated to 60ºC and the surrounding air is -10ºC. Assume that the average convective heat transfer coefficients are 20 W/m^2? K for the air/ice and 10 W/m^2?K for the ice/melted water.
What will be an ideal response?