Two charges lie on the x axis, +3q at the origin, and ?2q at x = 5.0 m. The point on the x axis where the electric potential has a zero value (when the value at infinity is also zero) is
a. 1.0 m.
b. 2.0 m.
c. 2.5 m.
d. 3.0 m.
e. 4.0 m.
d
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The oldest hominid so far discovered dates back to
A) 540 million years ago B) 65 million years ago C) a few thousand years ago D) 6 to 7 million years ago
A long straight wire carrying 15. A is perpendicular to a 0.10 T field. Find the force per meter on the wire
What will be an ideal response?
The light reflected from a soap bubble (n = 1.40) appears red (? = 640 nm) at its center. What is the minimum thickness (in nm)?
A. 124 B. 104 C. 114 D. 134 E. 234
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
