Standing Sound Waves: A 0.13-m string, fixed at both ends and vibrating in its n = 4 harmonic, excites a pipe that is 0.88 m long and open at both ends, into its second overtone resonance. What is the speed of transverse waves on the string? The speed of sound in air is 345 m/s.
A. 38 m/s
B. 36 m/s
C. 34 m/s
D. 32 m/s
E. 30 m/s
Answer: A
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An aluminum beam (E 5 72 GPa) with a square cross section and span length L 5 2.5 m is subjected to uniform load q 5 1.5 kN/m. The allowable bending stress is 60 MPa. The maximum deflection of the beam is approximately:
(A) 10 mm
(B) 16 mm
(C) 22 mm
(D) 26 mm
The faintest star visible to the naked eye has an apparent magnitude of about
A) 6. B) -1. C) 1. D) 0. E) 10.
Consider two blocks, one made of wood and the other of lead. They have the same dimensions but the lead is much more massive. If they are dropped and fall long enough to reach terminal velocity, which block experiences a larger force from air resistance?
A. The lead block B. The force on each is equal C. The wood block D. It isn't important because air resistance can be ignored
What is the focal length of a contact lens that will allow a person with a near point of 125 cm to read a physics book held 25.0 cm from his eyes?
A) -100 cm B) -31.3 cm C) 10.2 cm D) 20.8 cm E) 31.3 cm