Physics, 17.07.2019 18:30, silveryflight
Horseshoe bats (genus ) emit sounds from their nostrils and then listen to the frequency of the sound reflected from their prey to determine the prey's speed. (the "horseshoe" that gives the bat its name is a depression around the nostrils that acts like a focusing mirror, so that the bat emits sound in a narrow beam like a flashlight.) a flying at speed emits sound of frequency ; the sound it hears reflected from an insect flying toward it has a higher frequency . (a) show that the speed of the insect is where is the speed of sound. (b) if 80.7 khz, 83.5 khz, and 3.9 m/s, calculate the speed of the insect.
Answers: 2
Physics, 21.06.2019 18:50, NycLife
How does the image distance (di) of a convex lens compare with the image distance of a concave lens? a. the image distance of the convex lens is positive, and that of the concave lens is negative. b. both are negative for a virtual image. c. both are positive for a virtual image d. the image distance of the convex lens is negative, and that of the concave lens is positive.
Answers: 1
Physics, 22.06.2019 10:30, tay8556
The uniform slender bar rests on a smooth horizon- tal surface when a force f is applied normal to the bar at point a. point a is observed to have an initial acceleration aa of 20 m/s2, and the bar has a corre- sponding angular acceleration of 18 rad /s2. deter- mine the distance b.
Answers: 1
Physics, 23.06.2019 02:00, nativebabydoll35
Frequency of electromagnetic waves that a radio station is assigned. what do you call this type of wave?
Answers: 2
Horseshoe bats (genus ) emit sounds from their nostrils and then listen to the frequency of the soun...
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