An oscillating system has a small amount of damping. It is observed that in the course of 20.0 s the amplitude has decreased from A to A/2. What additional time is required for the amplitude to decrease to A/10?
What will be an ideal response?
46.4 s
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A 4.00 kg hollow cylinder of radius 5.00 cm starts from rest and rolls without slipping down a 30.0 degree incline. The acceleration of the center of mass of the cylinder is
A. 2.45 
B. 2.98
C. 3.35
D. 3.98
E. 4.05
Tidal forces are important to the Algol system today but were not important when both stars were still on the main sequence. Why not?
A) Main-sequence stars in a system like the Algol system are small compared to their physical separation. B) Main-sequence stars are too big to be affected by tidal forces. C) Main-sequence stars are too massive to be affected by tidal forces. D) Main-sequence stars are unaffected by tidally induced mass transfer.
A plane truss has downward applied load P at joint 2 and another load P applied leftward at joint 5. The force in member 3–5 is:
(A) 0
(B) -P/2
(C) -P
(D) +1.5 P
A pair of toy freight cars, one twice the mass of the other, fly apart when a compressed spring that joins them is released. The spring exerts the greater force on the
A) heavier car. B) lighter car. C) same on each.