Two loops of wire are arranged so that a changing current in one will induce a current in the other. If the current in the first is increasing counterclockwise by 1.0 A every second, the induced current in the second loop will:
a. be increasing counterclockwise.
c. stay zero.
b. increase clockwise also.
d. stay constant.
D
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Replot the data points of Figure 5.9(b) on log-log paper and find an equation approximating the best correlation line. Compare your results with Figure 5.10. Then, suppose that steam at 1 atm and 100°C is flowing across a 5-cm-OD pipe at a velocity of 1 m/s. Using the data in Figure 5.10, estimate the Nusselt number, the heat transfer coefficient, and the rate of heat transfer per meter length of pipe if the pipe is at 200°C and compare with predictions from your correlation equation.
GIVEN
Figure 5.9(b) in text
Steam flowing across a pipe
Steam pressure = 1 atm
Steam temperature (Ts) = 100°C
Pipe outside diameter (D) = 5 cm = 0.05 m
Steam velocity (U?) = 1 m/s
Pipe temperature (Tp) = 200°C
FIND
(a) Replot Figure 5.9(b) on log-log paper and find an equation approximating the best correlation line
(b) Find the Nusselt number (Nu), the heat transfer coefficient (hc), and the rate of heat transfer per
unit length (q/L) using Figure 5.10
(c) Compare results with your correlated equation
ASSUMPTIONS
Steady state
Radiative heat transfer is negligible
SKETCH
PROPERTIES AND CONSTANTS
From Appendix 2, Table 35, for steam at 1 atm and 100°C
If an electron has a wavelength of 0.123 nm, what is its kinetic energy, in electron-volts? This energy is not in the relativistic region. (melectron = 9.11 × 10-31 kg, 1 eV = 1.60 × 10-19 J, h = 6.626 × 10-34 J ? s)
A) 19.8 eV B) 60.2 eV C) 80.4 eV D) 99.5 eV E) 124 eV
Which of the following ions would never form in chemical reactions?
a. F2- b. Al3+ c. O2- d. N3-
The rate of heat dissipation in an AC circuit with resistance, R, and effective current, Irms, is given by which of the following?
a. 0.5 × (Irms)2R b. (Irms)2R c. 2.0 × (Irms)2R d. 4.0 × (Irms)2R