EES 0836 Lecture Notes - Lecture 23: Joule
3 Apr 2016
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Lecture - 23: note the v2 dependence this is why: A car at 60 mph is 4 times more dangerous than a car at 30 mph. Hurricane-force winds at 100 mph are much more destructive (4 times) than. = 65. 25 kg(cid:2)m2/s2 (cid:1) 65 j: a quarter (mass = 0. 00567 kg = 5. 67 g) flipped about four feet into the air has a speed on reaching your hand of about 5 m/s. = 0. 07 kg(cid:2)m2/s2 = 0. 07 j: more numerical examples, a 1500 kg car moves down the freeway at 30 m/s (67 mph) = 675,000 kg(cid:2)m2/s2 = 675 kj: a 2 kg (~4. 4 lb) fish jumps out of the water with a speed of 1 m/s (2. 2 mph) = 1 kg(cid:2)m2/s2 = 1 j: gravitational potential energy. It takes work to lift a mass against the pull (force) of gravity: the force of gravity is m(cid:2)g, where m is the mass, and g is the gravitational acceleration.
