A long thin uniform rod of length 1.50 m is to be suspended from a frictionless pivot located at some point along the rod so that its pendulum motion takes 3.00 s. How far from the center of the rod should the pivot be located?
A) 7.98 cm
B) 7.52 cm
C) 8.73 cm
D) 8.40 cm
E) 23.4 cm
Answer: C
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Slanting Surfaces With Friction: A 200-g hockey puck is launched up a ramp that is inclined at a 30° angle above the horizontal. The coefficients of static and kinetic friction between the puck and the ramp are µs = 0.40 and µk = 0.30, respectively, and the puck's initial velocity at the base is 3.8 m/s parallel to the sloping surface of the ramp. What speed does the puck have when it slides back down to its starting point?
Fill in the blank(s) with the appropriate word(s).
Suppose you live on the Moon. How long is a day (i.e. from sunrise to sunrise)?
24 hours a lunar month 23 hours 56 minutes a year
A venturi tube may be used as the inlet to an automobile carburetor. If the 2.0-cm diameter pipe narrows to a 1.0-cm diameter, what is the pressure drop in the constricted section for an airflow of 3.0 m/s in the 2.0-cm section? (? = 1.2 kg/m3.)
a. 70 Pa b. 85 Pa c. 100 Pa d. 120 Pa e. 81 Pa
The energy of an electron state has an uncertainty of about 0.500 eV. What is the uncertainty in the lifetime of the level?
A) 1.32 × 10-15 s B) 8.28 × 10-15 s C) 1.32 × 10-11 s D) 8.28 × 10-11 s E) 1.32 × 10-8 s