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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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 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
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.