Two identical balls are at rest side by side at the bottom of a hill. Some time after ball A is kicked up the hill, ball B is given a kick up the hill. Ball A is headed downhill when it passes ball B headed up the hill. At the instant when ball A passes ball B,
a. it has the same position and velocity as ball B.
b. it has the same position and acceleration as ball B.
c. it has the same velocity and acceleration as ball B.
d. it has the same displacement and velocity as ball B.
e. it has the same position, displacement and velocity as ball B.
B
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What nuclear fusion mechanism does an isolated white dwarf use to generate energy?
a. Proton-proton chain b. CNO cycle c. Triple alpha process d. White dwarfs don't generate their own energy.
A one-pass condenser-heat exchanger, shown in the sketch, has 64 tubes arranged in a square array with 8 tubes per line. The tubes are 1.22 m long and are made of copper with an outside diameter of 1.27 cm. They are contained in a shell at atmospheric pressure. Water flows inside the tubes whose outside wall temperature is 98°C. Calculate (a) the rate of steam condensation and (b) the temperature rise of the water if the flow rate per tube is 0.0454 kg/s.
GIVEN
? One-pass condenser heat exchanger with 64 tubes in a square array
FIND
(a) Rate of steam condensation
(b) Water temperature rise
SKETCH
PROPERTIES AND CONSTANTS
From Appendix 2, Table 13, the properties of saturated water at the film temperature (100 + 98)/2 = 99°C are
Ocean waves with a wavelength of 120 m are coming in at a rate of 8 per minute. What is their speed?
A. 8.0 m/s B. 16 m/s C. 24 m/s D. 30 m/s E. 4.0 m/s
An LRC circuit has component values such that the circuit is initially at critical damping. Which of the following modifications would make the circuit underdamped?
A) decreasing the capacitance C, keeping the inductance L and the resistance R the same B) reducing both the inductance and the capacitance by half, keeping the resistance R the same C) increasing the resistance R, keeping the inductance L and the capacitance C the same D) doubling both the inductance and the capacitance, keeping the resistance R the same E) decreasing the inductance L, keeping the capacitance C and the resistance R the same