Charges q and Q are placed on the x axis at x = 0 and x = 2.0 m, respectively. If q = ?40 pC and Q = +30 pC, determine the net flux through a spherical surface (radius = 1.0 m) centered on the origin
a. ?9.6 N / m2/C
b. ?6.8 N / m2/C
c. ?8.5 N / m2/C
d. ?4.5 N / m2/C
e. ?1.1 N / m2/C
d
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A long steel rod (2 cm in diameter, 2-m-long) has been heat-treated and quenched to a temperature of 100°C in an oil bath. To cool the rod further, it is necessary to remove it from the bath and expose it to room air. Will the faster cool-down result from cooling the cylinder in the vertical or horizontal position? How long will the two methods require to allow the rod to cool to 40°C in 20°C air?
GIVEN • A long steel rod in air • Diameter (D) = 2 cm = 0.02 m • Length (L) = 2 m • Initial temperature (Ts,i) = 100°C • Air temperature (T?) = 20°C FIND (a) Is it faster to cool the rod vertically or horizontally? (b) Time for rod to cool to 40°C in each position ASSUMPTIONS • Steel is 1% carbon PROPERTIES AND CONSTANTS for 1% carbon steel Thermal conductivity (ks) = 43 W/(m K) Specific heat (c) = 473 J/(kg K) Density (?) = 7801 kg/m3 for dry air at the initial mean temperature of 60°C Thermal expansion coefficient (?) = 0.003 1/K Thermal conductivity (k) = 0.0279 W/(m K) Kinematic viscosity (?) = 19.4 × 10–6 m2/s Prandtl number (Pr) = 0.71
Compared to orbital velocity, escape velocity is about:
A) the same. B) 70% less. C) 40% more. D) twice as large. E) four times greater.
Geminga pulses strongly in gamma rays, and may be the closest neutron star. Why is it unusual?
What will be an ideal response?
Brewster’s angle for a given interface is _______________ the critical angle for total internal reflection for the same interface.
A. always greater than B. either greater than or less than. C. always less than D. always equal to