Ideal incompressible water flows through a horizontal pipe of cross-sectional area 10.0 cm2 at a pressure of 0.250 atm with a volume flow rate of 1.00 × 10-3 m3/s. At a valve, the effective cross-sectional area of the pipe is reduced to 5.00 cm2
What is the pressure at the valve?
A) 0.200 atm B) 0.235 atm C) 0.112 atm D) 0.157 atm
B
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Neutron stars and black holes are formed by
A) the star formation process. B) mass transfer in binary star systems. C) novae. D) type I supernovae. E) type II supernovae.
The loss of usable energy in cables used to conduct electricity from power plants to cities is cause by ________________
Fill in the blank(s) with correct word
Two protons are released from rest, with only the electrostatic force exerted on them. Which of the following statements must be true about them as they move apart? (There could be more than one correct choice.)
A) Their electric potential energy keeps increasing. B) Their kinetic energy keeps increasing. C) Their electric potential energy keeps decreasing. D) Their kinetic energy keeps decreasing. E) Their acceleration keeps decreasing.
A resistor and a capacitor are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the capacitor is
A) greater than the battery's terminal voltage. B) less than the battery's terminal voltage, but greater than zero. C) equal to the battery's terminal voltage. D) zero.