What power contact lens should be used to correct the vision of a farsighted person whose near point is 80 cm to see something clearly at a distance of 25 cm?
A)
2.8 diopters
B)
-2.8 diopters
C)
-4.0 diopters
D)
-4.2 diopters
E)
4.2 diopters
A
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The figure shows two wires that are tied to a 710 g mass that revolves in a horizontal circle at a constant speed of 7.5 m/s. What is the tension in the upper wire?
A) 34 N B) 20 N C) 27 N D) 41 N
Compton Scattering: A beam of x-rays at a certain wavelength are scattered from a free electron that is at rest, and the scattered beam is observed at 45.0° from the incident beam. What is the change in the wavelength of the x-rays during this process? (melectron = 9.11 × 10-31 kg, c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s)
A. 1.75 × 10-13 m B. 2.76 × 10-13 m C. 0 m D. 3.56 × 10-13 m E. 7.10 × 10-13 m
First Law of Thermodynamics: A cylinder contains 13 moles of an ideal gas at a temperature of 300 K. The gas is compressed at constant pressure until the final volume equal 0.70 times the initial volume. The molar heat capacity at constant volume of the gas is 24.0 J/mol ? K. What is the change in the internal (thermal) energy of the gas during this process? (R = 8.31 J/mol ? K)
A. -28 kJ B. -38 kJ C. 28 kJ D. 38 kJ E. -9.7 kJ
When U-238 emits an alpha particle, the resulting nucleus has
A) 90 protons. B) 91 protons. C) 92 protons. D) 93 protons. E) 94 protons.