An up quark has charge +2/3, a down quark has charge -1/3, and a strange quark has charge -1/3. The Lambda0 particle is formed by a combination of an up, a down, and a strange quark. What is its charge?
A. 0
B. 1
C. +2/3
D. -2/3
E. -1
Ans: A. 0
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A tube of mercury with resistivity 9.84 × 10-7 ? ? m has a uniform electric field of 23 N/C inside the mercury. What is the current through the tube, if the radius of the tube is 0.495 mm?
A) 18 A B) 180 A C) 29 A D) 280 A
The siphon shown is used to transfer liquid from a higher level to a lower level. If the fluid is drawn up and is continuous through the tube, determine the velocity of flow of gasoline if the vertical distance from the liquid surface to the outlet is 1.0 m
a.
1.1 m/s
b.
2.2 m/s
c.
4.4 m/s
d.
9.8 m/s
e.
6.5 m/s
Estimate the time required to melt a 5-mm sheet of ice on an aircraft wing if the wing surface is heated to 60ºC and the surrounding air is -10ºC. Assume that the average convective heat transfer coefficients are 20 W/m^2? K for the air/ice and 10 W/m^2?K for the ice/melted water.
What will be an ideal response?
What are the advantages of making a telescope mirror thin? What problems result?
What will be an ideal response?