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Some species use echolocation to determine the position and velocity of objects and prey. Suppose a bat at rest sends out ultrasonic sound waves at 50.0 kHz and receives them returned from a insect moving directly away from it at 25 m/s. What is the sound frequency of the echo the bat hears?
(kHz)
A 70.0 kg person balances a 1250 kg elephant which is standing on a circular lift of diameter 2.00 m. What is the diameter of the piston
A bullet with mass 5.06 g is fired horizontally into a 2.038-kg block attached to a horizontal spring. Find the initial speed of the bullet-block system
Object A, which has been charged to + 29.2 nC, is at the origin. Object B, which has been charged to - 28.9 nC, is at ( x,y ) = ( 0.0;{rm cm},; 1.50 cm ).What is the y-component of force (vec{F}_{rm A ; on ; B})_{rm y} on B due to A.
A light bulb is connected to a 240-V wall socket. The current in the bulb depends on the time t according to the relation I = (2.828 A) sin[(345.4 Hz)t]. What is the average power delivered to the light bulb
A small light cylinder and a large heavy cylinder are released at the same time and roll down a ramp without slipping. Which one reaches the bottom first
When 5.0 g of steam at 100.C is added to some water at 20 C inside an insulated container, the final temperature of all the water is 40 C. What was the mass of the water at the beginning
Positive point-charges of +36.0 mC (Micro C) are fixed at two of the vertices of an equilateral triangle with sides of 3.30 m, located in vacuum. Determine the magnitude of the E-field at the third vertex
q1. a 59-g ice cube at 0degc is heated until 52 g has become water at 100degc and 7.0 g has become steam at 100degc.
A well with vertical sides and water at the bottom resonates at 7.00 Hz and at no lower frequency. How far down in the well is the water surface
Man pushes a 27-kg block 9.1 m along a level floor at constant speed with a force directed 45° below the horizontal. how much work does the man do on the block
A .230 kg baseball is thrown with a speed of 41 m/s. If the above ball comes to rest in the catcher's mitt in .085 seconds, how much force does the ball apply on the catcher's mitt
Gayle runs at a speed of 8.00 m/s and dives on a sled, initially at rest on the top of a frictionless, snow-covered hill, that has a vertical drop of 23.0 m. What is their speed at the bottom of the hill
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