If a spring stores 5 J of energy when it's compressed by 0.5 m, what is the
spring constant of the spring?
O
A. 800 N/m
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B. 80 N/m
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c. 40 N/m
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D. 400 N/m

Free runners jump long distances and land on the ground or a wall. how do they apply newton’s second law to lessen the force of impact?

Suppose water is leaking from a tank through a circular hole of area ah at its bottom. when water leaks through a hole, friction and contraction of the stream near the hole reduce the volume of water leaving the tank per second to cah 2gh , where c (0 < c < 1) is an empirical constant. a tank in the form of a right-circular cone standing on end, vertex down, is leaking water through a circular hole in its bottom. (assume the removed apex of the cone is of negligible height and volume.) (a) suppose the tank is 20 feet high and has radius 8 feet and the circular hole has radius 2 inches. the differential equation governing the height h in feet of water leaking from a tank after t seconds is dh dt = − 5 6h3/2 . if the height of the water is initially 8 feet, how long will it take the tank to empty? (round your answer to two decimal places.)

Argon, neon, and xenon are examples of