Consider a uniform horizontal electric field of 50 N/C directed toward the east. If the electric potential measured at a given point is 80 V, what is the potential at a point 1.0 m directly west of that point?
A) 30 V
B) 50 V
C) 80 V
D) 130 V
D
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Line waves with wavelength ? going through a slit with width a will be diffracted into circular waves with approximately equal amplitude in all forward directions
A. Always B. Never C. Only if ? >> a D. Only if a >> ? E. Only if a = ?
Two flanged shafts are connected by eight 18-mm bolts. The diam-eter of the bolt circle is 240 mm. The allowable shear stress in the bolts is 90 MPa. Ignore friction between the flange plates. The maximum value of torque T0 is approximately:
(A) 19 kN?m
(B) 22 kN?m
(C) 29 kN?m
(D) 37 kN?m
The resistance of a platinum wire is to be calibrated for low-temperature work. A platinum wire with resistance 1.5 ? at 30°C is immersed in liquid nitrogen at 93 K (?180°C). If the temperature response of the platinum wire is linear, what is the expected resistance of the platinum wire at ?180°C? [?platinum = 3.92 × 10^?3 (°C)?1]
a. 0.265 ? b. 2.38 ? c. 2.73 ? d. 8.48 ? e. 0.618 ?
A compact heat exchanger uses finned tubes as shown in Figure 9-30, spacing B. Determine the pressure drop and the convective heat transfer coefficient for air passing around the finned tubes at 27ºC, 5 m/s and with viscosity of 0.02 g/m?s. Air leaves the finned tubes at 100ºC. Also, determine the heat exchanger volume per unit surface area of heat exchange.
