A gas expands from an initial volume of 0.040 m3 to a final volume of 0.085 m3 while its pressure increases linearly with the volume (so that the process follows a straight-line path in a P-V diagram) from 110 kPa to 225 kPa
How much work is done by the system? A) 5.2 kJ
B) 7.5 kJ
C) 7.8 kJ
D) 11 kJ
E) 12 kJ
B
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A) four protons B) two neutrons and two protons in a helium nucleus C) A and B both have exactly the same mass.
A photocathode has a work function of 2.4 eV. The photocathode is illuminated with monochromatic radiation whose photon energy is 3.4 eV. The maximum kinetic energy of the photoelectrons produced is closest to:
A) 1.6 × 10-19 J B) 3.8 × 10-19 J C) 4.4 × 10-19 J D) 4.9 × 10-19 J E) 5.4 × 10-19 J
Dielectrics: The square plates of a 3000-pF parallel-plate capacitor measure 40 mm by 40 mm and are separated by a dielectric that is 0.29 mm thick and completely fills the region between the plates. What is the dielectric constant of the dielectric? (?0 = 8.85 × 10-12 C2/N ? m2)
A. 61 B. 56 C. 50 D. 45 E. 67
Estimate how many pennies would you have to stack to reach from the floor to an average 8-ft ceiling
A) 2 × 103 B) 2 × 102 C) 2 × 104 D) 2 × 105 E) 2 x 106