A charge Q is placed on the x axis at x = +4.0 m. A second charge q is located at the origin. If Q = +75 nC and q = -8.0 nC, what is the magnitude of the electric field on the y axis at y = +3.0 m?
a. 19 N/C
b. 23 N/C
c. 32 N/C
d. 35 N/C
e. 21 N/C
B
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The intensity of radiation reaching the Earth from the Sun is 1350 W/m2. The Earth's radius is 6.4 × 106 m. How big a force does this radiation exert on the Earth? (Assume it is all absorbed.)
A. 5.8 × 108 N B. 1.2 × 109 N C. 2.3 × 109 N D. 4.6 × 109 N E. 1.7 × 1017 N
Consider the circuit below. Switch S is closed at t = 0
What is the voltage across the capacitor C just after the switch is closed?
A particle physicist observes cosmic rays creating a new particle high in the atmosphere, and the speed of this particle is measured at 99.7% the speed of light. It is unstable, and is observed to decay in an average 37.0 ?s
If this particle were at rest in the laboratory, what would be its average lifetime? A) 2.9 µs B) 18 µs C) 5.3 µs D) 12 µs E) 4.3 µs
A cylinder containing an ideal gas has a volume of 3.0 m3 and a pressure of 1.0 × 10^5 Pa at a temperature of 300 K. The cylinder is placed against a metal block that is maintained at 900 K and the gas expands as the pressure remains constant until the temperature of the gas reaches 900 K. The change in internal energy of the gas is 9.0 × 10^5 J. Find the change in entropy of the block
associated with the heat transfer to the gas. a. 0 c. -1700 J/K b. +670 J/K d. -1100 J/K