Elliptical galaxies are more likely to be found in clusters than spiral galaxies
Indicate whether the statement is true or false
TRUE
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Alternating current has an advantage over direct current because ________
a. one can step up the voltage that one can use b. batteries can be displaced in most circuits c. electrical generators can be made to function d. incandescent lights will only work with AC
The average heat transfer per unit area is 100 W/m2 between saturated vapor R-134a and a tube. The R-134a is at 50ºC and flows at 0.5 kg/s through a 1-cm-diameter horizontal tube having average surface temperature of 20ºC. The R-134a is to be completely condensed when it leaves the tube. Estimate the tube length required, using hnfg = 205.9 kJ/kg for R-134a at 500C.
What will be an ideal response?
A proton (mass = 1.67 × 10?27 kg, charge = 1.60 × 10?19 C) moves from point A to point B under the influence of an electrostatic force only. At point A the proton moves with a speed of 50 km/s. At point B the speed of the proton is 80 km/s. Determine the potential difference VB?VA.
A. +20 V B. ?20 V C. ?27 V D. +27 V E. ?40 V
The Pacific Ocean southwest of the United States is the source region for the ______________ type of air mass
a. cP b. mA c. mT d. mP