A sound with ten times the amplitude of another sound is judged to be ten times as loud
a. True
b. False
Indicate whether the statement is true or false
False
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Air at 40ºC passes through an 80 cm by 60 cm rectangular duct 80 m long at 1 m/s. Estimate (a) the outlet temperature of the air if the duct wall temperature is 15ºC and (b) the hydraulic and thermal entrance lengths.
What will be an ideal response?
When a star collapses to form a black hole, its mass
A) increases. B) decreases. C) remains the same.
Compared to a sound of 40 decibels, the intensity of a sound of 50 decibels is
A) 10 times as much. B) 100 times as much. C) 1000 times as much. D) 10,000 times as much. E) more than 10,000 times as much.
A wire of length L carrying a current I is placed in a magnetic field. The direction of the magnetic field is opposite the direction of the current. In this situation, the wire experiences a maximum force
Indicate whether the statement is true or false