Show that the fin heat transfer for a square fin having an adiabatic tip is
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Water, of density 1000 kg/m3, is flowing in a drainage channel of rectangular cross-section. The width of the channel is 15 m, the depth of the water is 8.0 m and the speed of the flow is 2.5 m/s. At what rate is water flowing in this channel?
A) 2.0 × 105 kg/s B) 2.0 × 103 kg/s C) 3.0 × 105 kg/s D) 3.0 × 103 kg/s E) 3.0 × 102 kg/s
A container having a volume of 1.0 m3 holds 5.0 moles of helium gas at 50°C. If the helium behaves like an ideal gas, the total energy of the system is
A. 2.0 × 104 J. B. 2.5 × 104 J. C. 1.7 × 103 J. D. 1.5 × 103 J. E. 4.0 × 104 J.
A 15-kg child is sitting on a playground teeter-totter, 1.5 m from the pivot. What is the minimum distance, on the other side of the pivot, such that a 220-N force will make the child lift off the ground?
A) 2.4 m B) 0.10 m C) 1.5 m D) 9.8 m E) 1.0 m
The magnetic moment of an electron (charge = ?e; mass = me) moving in a circular orbit of radius r with speed v about a nucleus of mass mN is proportional to
a. r. b. v. c. vr. d. evr. e. mNvr.