A heavy stone of mass m is hung from the ceiling by a thin 8.25-g wire that is 65.0 cm long. When you gently pluck the upper end of the wire, a pulse travels down the wire and returns 7.84 ms later, having reflected off the lower end
The stone is heavy enough to prevent the lower end of the wire from moving. What is the mass m of the stone?
A) 8.90 kg
B) 23.1 kg
C) 35.6 kg
D) 227 kg
E) 349 kg
Answer: C
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The molecular weight of a long-chain molecule is equal to the molecular weight of a ______________unit times the number of ______________units.
Fill in the blank(s) with the appropriate word(s).
The objective and the eyepiece of a refracting astronomical telescope have focal lengths of 320 cm and 4.0 cm, respectively. The telescope is used to view Neptune and the final image is set at infinity
The diameter of Neptune is 4.96 × 107 m and the distance from the earth at the time of observation is 4.4 × 1012 m. What is the angle (in mrad) subtended by the final telescopic image of Neptune? A) 0.90 mrad B) 1.1 mrad C) 1.3 mrad D) 1.5 mrad E) 1.7 mrad
A 2.0 kg mass is attached to the end of a horizontal spring (k = 50. N/m) and set into simple harmonic motion with an amplitude of 10. cm. What is the total mechanical energy of this system?
A) 0.02 J B) 25 J C) 0.25 J D) 1.00 J E) 2.5 J
If f is the frequency of the emitted radiation, and h is Planck's constant (equal to 6.63 × 10^–34 J ? s), the energy E each emitted quantum of energy has in Planck's explanation of blackbody radiation is:
a. E = h / f. b. E = h f. c. E = h + f. d. E = mc2. e. E = f / h.