What is the force of gravity acting on a 1-kg mass? (g = 9.8 m/s2)
9.8 N
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The interior of Earth is studied by using
a. infrared light waves. b. yellow light waves. c. seismic waves. d. gamma waves.
The lattice spacing of the principal Bragg planes in sodium chloride is 0.282 nm. For what wavelength of x-rays will the first order reflected beam diffract at 55° with respect to the normal to the crystal planes?
A) 0.323 nm B) 0.530 nm C) 0.662 nm D) 0.150 nm E) 0.462 nm
A steam generator is a device that converts water into steam by capturing radiant heat from hot gases. Consider a 15 foot cubed steam generator, all sides made up of water tubes and a “fire ball” 6 ft. in diameter at 4000ºF at the center. If the water tubes have a surface temperature of 600ºF and an emissivity of 0.7, determine the heat transfer to the water from the combustion gases. Assume the fire ball acts as a black body.
What will be an ideal response?
Components: When rolled down a mountainside at 7.0 m/s, the horizontal component of its velocity vector was 1.8 m/s. What was the angle of the mountain surface above the horizontal?
A. 75° B. 57° C. 33° D. 15°