If the net torque on an object is zero, does the the net force on the object also have to be zero?
What will be an ideal response?
No. If the sum of the forces on an object are not zero, then the CM of the object will accelerate in the direction of the net force. If the sum of the torques on the object are zero, then the object has no angular acceleration.
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Potassium Iodide (chemical formula: KI) has a face-centered cubic structure (just like sodium chloride). If the distance between crystal planes is d = 0.353 nm and X-rays of wavelength ? = 0.0934 nm are used, what is the smallest angle ? at which a diffraction maximum may be obtained?
a. 9.92° b. 7.60° c. 13.3° d. 15.5° e. 6.52°
Why can't we be certain that the Andromeda Galaxy exists today?
What will be an ideal response?
Optical fibers work because of
a. interference. b. diffraction. c. total internal reflection. d. diffuse reflection. e. polarization.
Three pith balls supported by insulating threads hang from a support. We know that ball X is positively charged. When ball X is brought near balls Y and Z without touching them, it attracts Y and repels Z. Since pith is an insulating material, we can conclude that
a. Y has a negative charge. b. Z has a negative charge. c. Y has a positive charge. d. Z has a positive charge. e. Z is neutral (has no net charge.)