You look inside your piano and find that there are two types of strings: bare steel wire and steel wire wrapped with a copper coil. If you have one of each type of string with the same length and under the same tension, which will produce a lower frequency sound wave?
A. The bare wire will have a lower frequency.
B. The wrapped wire will have a lower frequency.
C. They will have the same frequency.
B. The wrapped wire will have a lower frequency.
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A mercury-in-glass thermometer reads an outside temperature of 20ºC. If the sky and surroundings of the thermometer have an average surface temperature of 5ºC, estimate the net radiation per unit area from or to the thermometer.
What will be an ideal response?
51 Pegasi is important because
a. it is a pulsar with planets orbiting around it. b. it is a star with a planet that is known to support intelligent life. c. it is the largest satellite of Jupiter. d. it is the largest known asteroid. e. it is the first star like our Sun that was found to have a planet orbiting it.
While a car travels around a circular track at a constant speed, its
A) acceleration is zero. B) velocity is zero. C) inertia is zero. D) none of the above
Two point charges are separated by 10.0 cm and have charges of +1.00 µC and -1.00 µC, respectively. What is the electric field at a point midway between the two charges? (ke = 8.99 × 10^9 N•m2/C2)
a. 14.4 × 10^6 N/C c. 28.8 × 10^6 N/C b. zero d. 7.19 × 10^6 N/C