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Horseshoe bats (genus Rhinolophus) emit sounds from their nostrils, 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 Rhinolophus flying at speed vbatemits sound of frequency fbat; the sound it hears reflected from an insect flying toward it has a higher frequency frefl.
If the bat emits a sound at a frequency of 80.0kHz and hears it reflected at a frequency of 83.6kHz while traveling at a speed of 4.0m/s, calculate the speed of the insect.
Water at a gauge pressure of P = 3.4 atm at street level flows into an office building at a speed of 0.90m/s through a pipe 5.6 cm in diameter. find the gauge pressure in the pipe on the top floor
for a horizontal block spring system, the maximum displacement is 15cm. if k = 150N/m, calculate the mass of the block, calculate maximum value of kinetic energy
An aluminum wire having a cross-sectional area of 4.00 3 1026 m2 carries a current of 5.00 A. Find the drift speed of the electrons in the wire
Two boxes of masses m1 = 20.0 kg and m2=40.0 kg are connected by a rope through a pulley that has a uniform wheel of mass M=10.0 kg
a stone is projected at a cliff of height h with an initial speed of 44.0 m/s directed at an angle θ0 = 62.0° above the horizontal. find the height h of the cliff
a candle is placed at a distance of 15 cm in front of a concave mirror of radius 40 cm. where is the image of the candle
The middle C string on a piano is under a tension of 944N. The period and wavelength of a wave on this string are 3.82 ms, calculate the linear density of the string
A diesel engine performs an amount of mechanical work equal to 2800Jand discards an amount of heat equal to 4800J each cycle. What is the thermal efficiency of the engine
A low-power laser used in a physics lab might have a power of 0.55 mW and a beam diameter of 2.6 mm. Calculate the average light intensity of the laser beam
Consider a steam turbine in which the steam expands adiabatically. If the turbine consumes 1.00 kg steam each second, calculate the temperature of the steam at the exhaust
Early black-and-white television sets used an electron beam to draw a picture on the screen. The electrons in the beam were accelerated by a voltage of 3.0 kV, What is the speed of electrons in the beam
A irregular piece of metal has a dry mass of 5.7 kg. Once it is submerged it has an apparent mass of 2.4 kg. What is the density of the piece of metal
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