Why do rich clusters of galaxies contain a larger fraction of ellipticals than normal?
What will be an ideal response?
In the densest clusters, collisions happen frequently, tearing off the spiral arms and dissipating their material into the intergalactic medium at high temperatures.
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What area plates would a parallel plate 1.0 F capacitor have with a plate separation of 0.10 mm and a dielectric of constant 10?
A. 1000
B. 5500
C. 130 
D. 
E. 
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 resulting atomic number of an element that emits 1 alpha particle, 1 positron, and 3 beta particles is
A) decreased by 2. B) decreased by 1. C) unchanged. D) increased by 1. E) increased by 2.
Gas in a container increases its pressure from 1 atm to 3 atm while keeping its volume constant. Find the work done (in J) by the gas if the volume is 5 liters
a. 0 b. 3 c. 5 d. 15 e. 15 × 10^2