Which characteristic listed below describes the jovian planets?
A) close to the Sun
B) small masses
C) low density
D) solid surfaces
E) slow rotational period
C
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An innovative physics professor conducts laboratory exercises in the college swimming pool. Suppose that one exercise was the measurement of the degree of polarization by bouncing laser light off a surface of glass. If the glass used has an index of refraction of 1.52, at what angle of incidence will the reflected beam be perfectly polarized? It will help to recall that the index of refraction of water is 1.33.
A. 
B. 
C. 
D. 
If the sum of the external torques on an object is zero, then the sum of the external forces on it must also be zero
A) True B) False
Charges q, q, and –q are placed on the x axis at x = 0, x = 2 m, and x = 4 m, respectively. At which of the following points does the electric field have the greatest magnitude?
a. x = 3 m b. x = 1 m c. x = 5 m d. The electric field has the same magnitude at all three positions.
In a condenser of a refrigeration unit, saturated vapor R-134a flows at 0.5 m/s into a 0.5 cm diameter horizontal tube. The tube inside surface temperature is 30ºC and the R- 134a is at 80ºC. Estimate the convective heat transfer coefficient and the expected tube length required for complete condensation of the R-134a. Use hnfg of 106.3 kJ/kg, ?f of 927.6 kg/m3, ?g of 153.8 kg/m3, and cp, ?, and ? at 400C.
What will be an ideal response?