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Bats perform echolocation by sending out cries and gathering information about their surroundings based on the echoes that return back to them. For this problem, assume that sound propagates at 343 m/s.
A. A stationary bat emits a chirp, the sound hits a stationary moth and is reflected back. The bat detects an echo after 17ms (milli-seconds). How far away is the moth?
B. A bat emits a chirp at 32kHz while flying ?away from a moth at 2m/s. Many insects, including moths, have the ability to detect bat sonar (and use this to avoid being eaten). What is the frequency of the sound detected by the moth?
A parallel-plate capacitor has circular plates of 9.27 cm radius and 1.79 mm separation. Calculate the capacitance in picofarads (pF)
200 mL of water at 20.0 C is placed in the freezer compartment of a refrigerator with a coefficient of performance of 4.00. How much heat energy is exhausted into the room
Will this stress exceed the concrete's strength? What clearance or gap should be allowed between the slabs to avoid buckling up to the 50C - what can you say about these bodies?
A 2200kg sport utility vehicle travelling at 96 km/h can be stopped in 0.20 s if it hits a concrete wall. Suppose a 60 kg person was in the car that hit this wall. The velocity of the person equals that of the car both before and after the crash a..
A sinusoidal force with an amplitude of 1.70 N drives the system. At what frequency will the force make the object vibrate with an amplitude of 0.440 m
What is the annual petroleum consumption of the United States, and where does this petroleum originate? Include all sources supplying a significant fraction of the US consumption (5% or more).
determine the cutoff frequency for cesium and its work function.
If the radius is 2.10m and the coefficient of statc fricton between the wall and the people is 0.39. What is the minimum angular velocity at which the floor can be withdrawn?
A particle is moving along the curve x=2t2, y=t2-4t, z=3t-5 where t is time determine the component of its velocity and acceleration at time t=1 in the direction 2i-3j+2k
What pressure difference is required to maintain the same volume flow rate if the radius of the pipe is decreased to 0.110 m?
When there is an input connected across a 12V DC source what is the voltage of the output voltage after the power is connected for a while
A 1200 crate slides 15 down a ramp that makes an angle of 30 with the horizontal. If crate slides at a constant speed, how much thermal energy is created?
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