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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.
A current of -3.70 A is located 5.51 cm along the x axis, that is, at the point (5.51,0.00) cm. A current of -6.15 A is located 4.08 cm along the y axis, Find the magnetic field at the origin
In proton-beam therapy, a high-energy beam of protons is fired at a tumor, What is the total charge of the protons that must be fired at the tumor to deposit the required energy
A cable is stretched horizontally across the top of two vertical poles 20 m apart. What is the tension in each cable segment
A gas cylinder of volume 26 liters contains an ideal gas at temperature 27 degrees C and pressure 1920 kPa. How many moles of gas leaked
During a circus performance, a 67-kg human cannonball is shot out of an 17-m-long cannon. determine the average net force exerted on him in the barrel of the cannon
An AC adapter for a telephone answering machine uses a transformer to reduce the line voltage of 120 V to a voltage of 7.00 V. What is the power drawn from the electric outlet
A lever uses an effort arm of 4.75 m and has a resistance arm of 21.5 cm. What is the mechanical advantage of the lever
A meteorite that has a mass equal to 30.8 tonne (1 tonne = 1000 kg) is exhibited in the American Museum of Natural History in New York City, Find the magnitude of the impulse experienced by the meteorite up to the time its kinetic energy was halved
A popcorn kernal initially at rest, explodes into two peices, one haveing twice the mass of the other. What is the ration of velocities of the frgament
the hanging object has a mass of m1 = 0.370 kg; the sliding block has a mass of m2 = 0.780 kg; and the pulley is a hollow cylinder with a mass of M = 0.350 kg, Find the angular speed of the pulley at the same moment
A 0.250-kg piece of aluminum that has a temperature of -173 °C is added to 1.0 kg of water that has a temperature of 1.4 °C. determine the mass of water that has been frozen into ice
A solenoid 88.0 cm long has a radius of 2.60 cm and a winding of 2000 turns; it carries a current of 3.60 A. Calculate the magnetic field outside the solenoid
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