The current in an electron beam in a cathode-ray tube is measured to be 280 µA. How many electrons hit the screen in 50 s? (e = 1.6 × 10^-19 C)
a. 2.2 × 10^11 electrons
c. 8.8 × 10^15 electrons
b. 8.8 × 10^16 electrons
d. 2.2 × 10^15 electrons
B
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Consider a Carnot cycle starting at the state of highest pressure and smallest volume. Call the isothermal expansion that starts at this state step 1, the adiabatic expansion which follows step 2, the isothermal compression that then follows step 3, and the adiabatic compression which returns the system to the initial state step 4 . In which step does the entropy of the system increase?
a. 1 b. 2 c. 3 d. 4
Potential: As an electron moves in the direction the electric field lines
A. it is moving from low potential to high potential and gaining electric potential energy. B. it is moving from low potential to high potential and losing electric potential energy. C. it is moving from high potential to low potential and gaining electric potential energy. D. it is moving from high potential to low potential and losing electric potential energy. E. both its electric potential and electric potential energy remain constant.
Ptolemy's model was ________, with the Earth fixed in the center of the universe
Fill in the blank(s) with correct word
Whether a truck comes to a stop by crashing into a haystack or a brick wall, the impulse is
A) greater with the haystack. B) greater with the brick wall. C) both the same