In a hypothetical stream flowing downslope, stream discharge doubles and the cross-sectional area of the channel also doubles. For this situation, what will happen to the stream's speed?
What will be an ideal response?
Answer: The cross-sectional area of the stream channel increased by the same percentage as the discharge, so stream speed does not change.
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An enclosed chamber with sound absorbing walls has a 2.0 m × 1.0 m opening for an outside window
A loudspeaker is located outdoors, 78 m away and facing the window. The intensity level of the sound entering the window space from the loudspeaker is 79 dB. Assume the acoustic output of the loudspeaker is uniform in all directions and that the acoustic energy incident upon the ground is completely absorbed and therefore is not reflected into the window. The threshold of hearing is 1.0 × 10-12 W/m2. The acoustic power entering through the window space is closest to A) 160 µW. B) 79 µW. C) 320 µW. D) 790 µW. E) 1600 µW.
Many of the brightest stars we see are only a few million years old
Indicate whether the statement is true or false
When Mary is 3.00 m from the center of a merry-go-round, her tangential speed is a constant 1.88 m/s. (a) What is her angular speed in rad/s? (b) What is the magnitude of her linear acceleration?
What will be an ideal response?
Two blocks hang from strings would around different parts of a 2 kg double pulley as shown. The pivot exerts a normal force FN supporting the double pulley. Assuming the system is not in equilibrium, which statement about FN is true after the system is released from rest? (Use g = 10 N/kg.)