Our solar system contains only 65 moons (as of Summer 2007)
Indicate whether the statement is true or false
FALSE
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A circular coil lays flat on a horizontal table in a region where the magnetic field is straight down. The magnetic field is suddenly removed. When viewed from above, what is the direction of the current in the coil as the field is removed?
A. clockwise B. clockwise initially, then counter-clockwise before going to zero C. counter-clockwise D. There is no induced current.
Experiments have been performed on the temperature distribution in a homogeneous long cylinder (0.1 m diameter, thermal conductivity of 0.2 W/(m K) with uniform internal heat generation. By dimensional analysis, determine the relation between the steady-state temperature at the center of the cylinder Tc the diameter, the thermal conductivity, and the rate of heat generation. Take the temperature at the surface as you datum. What is the equation for the center temperature if the difference between center and surface temperature is 30°C when the heat generation is 3000 W/m3?
GIVEN
A homogeneous long cylinder with uniform internal heat generation
Diameter (D) = 0.1 m
Thermal conductivity (k) = 0.2 W/(m K)
Difference between surface and center temperature (Tc – Ts) = 30°C
Heat generation rate q = 3000 W/m3
FIND
(a) Relation between center temperature (Tc), diameter (D), thermal conductivity (k), and rate of heat
generation q
(b) Equation for the center temperature for the given data
ASSUMPTIONS
Steady state
One dimensional conduction in the radial direction
SKETCH
A sievert (Sv) is
A) the SI unit of absorbed dose = 1 J/kg = 100 rad. B) 10-2 J/kg. C) 3.70 × 1010 decays/s in radium. D) a dosage of 2.58 × 10-4 C/kg. E) the effective dose of 1 Gy.
The electric potential of a charge distribution is given by the equation V(x) = 3 x2 y2 + y z3 - 2 z3x, where x, y, z are measured in meters and V is measured in volts
Calculate the magnitude of the electric field vector at the position (x,y,z) = (1.0, 1.0, 1.0). A) 4.3 V/m B) 2.0 V/m C) -8.1 V/m D) 8.6 V/m E) 74 V/m