An initially installed flywheel can store 106 J of kinetic energy when rotating at 300 rad/s. It is replaced by another flywheel of the same size but made of a stronger material. If its mass is the same as that of the original, and it is now capable of achieving a rotational speed of 600 rad/s, what maximum energy can be stored?
a. 40 × 10^5 J
c. 10 × 10^5 J
b. 20 × 10^5 J
d. 5.0 × 10^5 J
A
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Radioactivity Basics: Neodymium 
Nd is an isotope that undergoes alpha decay. What isotope is the product of this decay?
A. 
Ba
B. 
Ce
C. 
Pr
D. 
Sm
E. 
Gd
Magnetic Materials: When a ferromagnetic material is placed in an external magnetic field, the net magnetic field of its magnetic domains becomes
A. smaller. B. zero. C. larger.
A sphere hanging freely from a cord is in
A) stable equilibrium. B) unstable equilibrium. C) neutral equilibrium. D) positive equilibrium. E) negative equilibrium.
Three boxes in contact rest side-by-side on a smooth, horizontal floor
Their masses are 5.0-kg, 3.0-kg, and 2.0-kg, with the 3.0-kg box in the center. A force of 50 N pushes on the 5.0-kg box, which pushes against the other two boxes. (a) Draw the free-body diagrams for each of the boxes. (b) What magnitude force does the 3.0-kg box exert on the 5.0-kg box? (c) What magnitude force does the 3.0-kg box exert on the 2.0-kg box?