A block holding a ringing tuning fork oscillates back and forth, attached to a wall by a spring of spring on a horizontal, frictionless surface, with amplitude 17 cm. The spring constant is 390 N/m. An observer who is situated so that the block’s direction of motion is either directly towards or away from him notes that the frequency he hears varies between 174 and 178 Hz. What is the mass of the tuning fork and block together? The speed of sound at the time of the experiment is 340 m/s.
A. 4.4 kg
B. 0.76 kg
C. 0.18 kg
D. 2.9 kg
B. 0.76 kg
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A muon is an unstable particle that has an average lifetime of 1.52 × 10-6 s
This is the time interval between its creation in a nuclear process and its extinction into decay products, as measured in a frame of reference at rest with respect to the muon. An "average" muon is observed by a scientist on Earth to travel 342 m in its lifetime. What is the speed of the muon relative to Earth? A) 0.821c B) 0.681c C) 0.601c D) 0.551c E) 0.335c
If the greenhouse effect on Earth were absent, Earth's average temperature would be about
A) -18°C. B) appreciably warmer. C) as it is now.
Relative distribution of charge density on the surface of a conducting solid depends on the
a. shape of the conductor. b. mass density of the conductor. c. type of metal of which the conductor is made. d. strength of the earth's gravitational field.
A simple pendulum has a mass of 0.202 kg and a length of 1.00 m. It is displaced through an angle of 31.4° and then released. After a time, the maximum angle of swing is only 10.0°. How much energy has been lost to friction?
a. 0.260 J b. 0.290 J c. 0.0301 J d. 1.00 J e. 0.320 J