In Bohr's model of the atom, electrons:
A) only make transitions between orbitals of specific energies.
B) are not confined to specific orbits.
C) are spread uniformly through a large, positive mass.
D) can be halfway between orbits.
E) move from orbit to orbit in many small steps.
A
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A 10 kg solid cylinder (I = 1/2 
with a radius of 30.0 cm is rotating about a vertical axis through its center. If the angular momentum is increasing at the rate of 25.0 kg 
then what is the angular acceleration?
A. 75.3 
B. 65.9
C. 55.6
D. 40.5
E. 35.2
If a radioactive isotope has a one year halflife, what fraction will remain after 5 years?
A) None B) Half C) 1/32 D) 1/5 [one fifth] E) 1/64
Equilibrium: A 40-kg uniform ladder that is 5.0 m long is placed against a smooth wall at a height of h = 4.0 m, as shown in the figure. The base of the ladder rests on a rough horizontal surface whose coefficient of static friction with the ladder is 0.40. An 80-kg bucket is suspended from the top rung of the ladder, just at the wall. What is the magnitude of the force that the ladder exerts on the wall?
A. 740 N B. 1300 N C. 980 N D. 900 N E. 1100 N
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?