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A fishing boat is drifting just above a school of tuna on a foggy day. Without warning, an engine backfire occurs on another boat 1.40 km away. How much time elapses between the instant when the backfire is heard by the fish?
a 190 kg object is moving 15 ms. if a net work of 12500 j is done on the object to increase its speed then use the
A total of 2.99·106 electrons are placed on an initially uncharged wire of length 2.25 m. a) What is the magnitude of the electric field a perpendicular distance of 0.494 m away from the midpoint of the wire? b) What is the magnitude of the accele..
A uniform steel beam has a mass of 490 kg. On it is resting half of an identical beam. What is the vertical support force at each end
A nurse counts 60 heartbeats in one minute. What are the period and frequency of the heart's oscillations
two spheres with charges of 6x10-6 and -2x10-6 bagin at a distance of .02 m. they touch and then seperate. calculate
A 6 kg box is held at rest by two ropes that form a 30 degree angle with the vertical. and external for F acts vertically downward on the box.
A 19-kg sled is being pulled along the horizontal snow-covered ground by a horizontal force of 23 N. Find the coefficient of kinetic friction between the runners of the sled and the snow
2.30×106 atoms are excited to an upper energy level at t=0s. At the end of 10.0ns, How many photons have been emitted
A block rests on a spring and oscillates with a frequency of 4Hz and an amplitude of 7cm. What is the speed of the bead at the instant when it loses contact with the block
Light of wavelength 500 nm illuminates a round 0.50-mm-diameter hole. find the width of the central bright circle on the screen
A source of sound waves of frequency 1.2 kHz is traveling through the air at 0.25times the speed of sound. What is the frequency of the sound received with a stationary observer if the source moves toward her?
A Carnot engine has 40 g of helium gas as its working substance. It operates between two reservoirs of temperatures T1 = 400°C and T2 = 60°C. find the work generated by this engine during one cycle
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