A copper pipe is held vertically and a magnet is dropped down the pipe. The magnet is oriented with the north pole down. What direction do the Eddy currents flow as viewed from above the pipe? If copper bar of approximately the same size and weight is dropped down the tube will it fall faster or slower?
A. CCW above the magnet and CW below the magnet; copper bar will fall slower
B. CCW above the magnet and CW below the magnet; copper bar will fall faster
C. CW above the magnet and CCW below the magnet; copper bar will fall slower
D. CW above the magnet and CCW below the magnet; copper bar will fall faster
B. CCW above the magnet and CW below the magnet; copper bar will fall faster
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Compare the axial heat flux achievable by a heat pipe using water as the working fluid with that of a solid silver rod. Assume that both are 20-cm-long, that the temperature difference for the rod from end to end is 100°C and that the heat pipe operates at atmospheric pressure. State your other assumptions.
GIVEN ? Silver rod and a heat pipe, both 20-cm-long ? End-to-end temperature difference of 100°C ? Heat pipe operates at atmospheric pressure FIND (a) Axial heat flux for both rods ASSUMPTIONS ? Neglect heat pipe vapor pressure drop ? Horizontal operation for the heat pipe ? Perfect wetting of the heat pipe fluid, ? ?= 0 PROPERTIES AND CONSTANTS From Appendix 2, Table 12, the conductivity for silver at 63°C is ksilver = 424 W/(mK)
A particle (mass = 5.0 g, charge = 40 mC) moves in a region of space where the electric field is uniform and is given by Ex = -2.3 N/C, Ey = Ez = 0 . If the position and velocity of the particle at t = 0 are given by x = y = z = 0 and vz = 20 m/s, vx = vy = 0, what is the distance from the origin to the particle at t = 2.0 s?
a. 60 m b. 54 m c. 69 m d. 78 m e. 3.2 m
Find the circulation for the path shown.
A. -(4 A)
B. (4 A)
C. -(28 A)
D. (28 A)
E. -(7 A)
A resistor of unknown resistance and a 15-? resistor are connected across a 20-V emf in such a way that a 2.0 A current is observed in the emf. What is the value of the unknown resistance?
a. 75 ? b. 12 ? c. 7.5 ? d. 30 ? e. 5.0 ?