The orbits of the electron in the Bohr model of the hydrogen atom are those in which the electron's_______________ is quantized in integral multiples of 
A. kinetic energy
B. potential energy
C. total energy
D. linear momentum
E. angular momentum
E. angular momentum
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A sewing machine needle moves up and down in simple harmonic motion with an amplitude of 1.27 cm and a frequency of 2.55 Hz. What is the maximum acceleration of the needle?
A) 8.26 cm/s2 B) 16.5 cm/s2 C) 18.1 cm/s2 D) 326 cm/s2 E) 163 cm/s2
Arvin the Ant is on a picnic table. He travels 30 cm eastward, then 20 cm northward, and finally 15 cm westward. What is the magnitude of Arvin's net displacement?
a. 25 cm c. 50 cm b. 65 cm d. 29 cm
An object is placed 9.5 cm in front of a convex lens with a focal length of magnitude 24 cm. (a) Where is the image formed and how far is it from the lens? (b) What is the magnification produced by the lens?
What will be an ideal response?
A cone balanced on its small end is in
A) stable equilibrium. B) unstable equilibrium. C) neutral equilibrium. D) positive equilibrium. E) negative equilibrium.