Standing Waves on a String: A 4.0-g string is 0.39 m long and is under tension. The string vibrates at 600 Hz in its third harmonic. What is the tension in this string?
A. 250 N
B. 200 N
C. 160 N
D. 290 N
E. 340 N
Answer: A
Physics & Space Science
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Velocity: A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 km/h. What is her average speed for the trip?
A. 85 km/h B. 88 km/h C. 90 km/h D. 92 km/h
Physics & Space Science
What does not characterize a scientific explanation?
a. It is based on the ideas of the smartest people. b. It is based on a model of nature. c. It is based on observations. d. It is tested through prediction and experiments.
Physics & Space Science
In choosing between sound waves and radio waves, which has the greater speed?
A) sound wave B) radio wave C) both the same D) need more information
Physics & Space Science
In a dc motor, the polarity and current are reversed by a(n) ______________
Fill in the blank(s) with correct word
Physics & Space Science