A square loop (L = 0.20 m) consists of 50 closely wrapped turns, each carrying a current of 0.50 A. The loop is oriented as shown in a uniform magnetic field of 0.40 T directed in the positive y direction. What is the magnitude of the torque on the loop?
a.
0.21 N ? m
b.
0.20 N ? m
c.
0.35 N ? m
d.
0.12 N ? m
e.
1.73 N ? m
c
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Determine the excess temperature at one-half of the maximum heat flux for the fluid- surface combinations in Problem 9.3.
GIVEN
? Nucleate pool boiling on a clean surface
FIND
The excess temperature (?Tx) at one half of the maximum heat flux for (a) water at 10 kPa on brass (b) water at 1 MPa on brass
PROPERTIES AND CONSTANTS
From Appendix 2, Table 13, for water Table 9.2 for surface tension
From Table 9.1, the coefficient, Csf, for water on brass = 0.0060
Kinetic energy of a rolling object
A. Is zero B. Is the same as a non-rotating object with the same speed C. Is greater than that of a non-rotating object with the same speed D. Is less than that of a non-rotating object with the same speed
On the H-R diagram, white dwarfs lie Sirius B and Procyon B lie:
A) at the top left. B) at the top right. C) close to the Sun, near the center. D) at the lower left. E) at the lower right.
You discover a binary star system in which one member is a15 solar mass main-sequence star and the other star is a 10 solar mass giant star. How do we believe that a star system such as this might have come to exist?
A) The two stars probably were once separate but became a binary when a close encounter allowed their mutual gravity to pull them together. B) Other than the very low odds of finding a system with two such massive stars, there is nothing surprising about the fact that such systems exist. C) The main-sequence star probably is a pulsating variable star and therefore appears to be less massive than it really is. D) Although both stars probably formed from the same clump of gas, the more massive one must have had its birth slowed so that it became a main-sequence star millions of years later than its less massive companion. E) The giant must once have been the more massive star but transferred some of its mass to its companion.