In a single electric cord, such as a cord that connects a wall socket with an electric light,
A) there is just one wire, carrying protons into the light bulb.
B) there are two wires, one carrying electrons into the light bulb and the other carrying electrons out.
C) there are two wires, one carrying protons into the light bulb and the other carrying protons out of the light bulb.
D) there is just one wire, carrying electrons into the light bulb.
E) there are two wires, both carrying giant pumpkins into the light bulb.
B
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Use the appropriate relativity formula given in the text to answer the following: Isabella is moving by you at a speed of 0.8c. While 1 minute passes on your watch, how much time will you see pass on her watch?
A) 36 seconds B) 1 minute C) 48 seconds D) 100 seconds
An object slides on a level floor. It slows and comes to a stop with a constant acceleration of magnitude 2.4 m/s2. What is the coefficient of kinetic friction between the object and the floor?
A) 0.24 B) 0.48 C) 0.12 D) It is impossible to determine without knowing the mass of the object.
Consider a situation where you exert a force F on a crate of mass m, moving it at a speed v a distance d across a floor in a time interval t. The quantity Fd is
a. the kinetic energy of the crate b. the potential energy of the crate c. the linear momentum of the crate d. the work you do on the crate e. the power you supply to the crate
Which one of the following mathematical expressions is correct for destructive interference for two beams of light in the double slit experiment?
A) Path Difference = (m - 1/2 ) ?, m = 0, ±1, ±2, . . . B) Path Difference = ?/m, m = 0, ±1, ±2, . . . C) Path Difference = m?, m = 0, ±1, ±2, . . . D) Path Difference = m?2, m = 0, ±1, ±2, . . . E) Path Difference = m/?, m = 0, ±1, ±2, . . .