If the interplanar spacing of NaCl is 2.814 × 10^?10 m, what is the predicted angle at which X-rays of wavelength 0.140 nm will be diffracted in a first-order maximum?
a. 31.3°
b. 7.20°
c. 20.5°
d. 14.4°
e. 29.8°
d
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It takes 87 J of work to stretch an ideal spring from 1.4 m to 2.9 m from equilibrium. What is the value of the spring constant of this spring?
A) 27 N/m B) 77 N/m C) 52 N/m D) 39 N/m
What is the most intriguing piece of evidence that suggests that the Martian meteorite ALH84001 may have once contained life?
A) molecules of DNA were found inside B) oxygen gas was found trapped inside the meteorite C) amino acids were found inside D) highly magnified images of carbonate grains found inside reveal rod-shaped structures that look much like terrestrial nanobacteria
An object is being acted upon by three forces and moves with a constant velocity. One force is 60.0 N along the x-axis, the second is 75.0 N along the y-axis. What is the magnitude of the third force?
A) 135 N B) 15.0 N C) 48.0 N D) 67.5 N E) 96.0 N
An airplane flies in a horizontal circle of radius 500 m at a speed of 150 m/s. If the plane were to fly in the same 500 m circle at a speed of 300 m/s, by what factor would its centripetal acceleration change?
a. 0.25 b. 0.50 c. 1.00 d. 2.00 e. 4.00