John is nearsighted and cannot see things beyond 90 cm from his eyes. What is the refractive power of the contact lenses that will enable him to see distant objects clearly?
A) +1.1 diopters
B) -1.1 diopters
C) -1.7 diopters
D) -2.2 diopters
E) +2.2 diopters
B
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A 3.0-kg block is on a frictionless horizontal surface. The block is at rest when, at t = 0, a force (magnitude P = 2.0 N) acting at an angle of 22° above the horizontal is applied to the block. At what rate is the force P doing work at t = 2.0 s?
a. 2.3 W b. 2.0 W c. 1.4 W d. 1.7 W e. 1.2 W
If a nucleus had a diameter of 8.0 fm, what would be its expected mass, in atomic mass units?
A) 128 u B) 7 u C) 296 u D) 37 u E) 64 u
The whiteness of clouds, unlike the blueness of the sky, primarily involves
A) medium sized particles. B) reflection and refraction of sunlight. C) seeds upon which condensation of cloud material forms. D) water prisms.
A perpetual motion machine of the first kind
A. violates the first law of thermodynamics B. would be a good investment C. violates the second law of thermodynamics D. violates the zeroth law of thermodynamics