In the figure below, a disk (radius R = 1.0 m, mass = 2.0 kg) is suspended from a pivot a distance d = 0.25 m above its center of mass. For a circular disk, 
. The angular frequency (in rad/s) for small oscillations is approximately
?
?
A. 4.2.
B. 2.1.
C. 1.5.
D. 1.0.
E. 3.8.
Answer: B
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Light with a wavelength of 310 nm is incident on a metal that has a work function of 3.80 eV
What is the maximum kinetic energy that a photoelectron ejected in this process can have? (1 eV = 1.60 × 10-19 J, c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s) A) 0.62 × 10-19 J B) 0.21 × 10-19 J C) 0.36 × 10-19 J D) 0.48 × 10-19 J E) 0.33 × 10-19 J
A uniform 100-lb beam is held in a vertical position by a pin at its lower end and a cable at its upper end. A horizontal force (magnitude P) acts as shown in the figure. If P = 75 lb, what is the tension in the cable?
a.
54 lb
b.
69 lb
c.
47 lb
d.
61 lb
e.
75 lb
A 50.0-mH inductor is connected in series with a 2500-? resistor in an ac circuit. What is the phase angle at 3000 Hz?
A) 90.0° B) -20.7° C) -75.9° D) 20.7° E) 75.9°
If two adjacent frequencies of an organ pipe closed at one end are 500 Hz and 700 Hz, what is the length of the organ pipe? (vsound = 340 m/s)
a. 0.85 m c. 1.50 m b. 1.25 m d. 1.70 m