In 1990 Walter Arfeuille of Belgium lifted a 281.5-kg object through a distance of 17.1 cm using only his teeth (a) How much work did Arfeuille do on the object? (b) What magnitude force did he exert on the object during the lift, assuming the force is constant. kN
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Mass of the object m = 281.5 kg
distance lifted d = 17.1 cm = 0.171 m
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- 1. Boxing gloves are padded to lessen the force of a blow. The glove and face compress 7.5000 cm during a blow in which the 7.0000-kg arm and glove are brought to rest from an initial speed of 10.0000 m/s. ▬▬ - Think & Prepare 1. Make note of what's given and what's unknown. Relate known quantities to symbols. 2. Draw a labeled sketch if possible. 3. Identify the physics principle and approach. Write down relevant equations symbolically. Simplify if possible. 4. Insert numerical quantities to solve for unknowns. 5. Does the answer make sense? % (a) Calculate the change in kinetic energy of the glove and arm. AKE = (b) Where does this energy go? O Search 5 O into doing work against the force exerted by the face against the glove O into doing work against gravity O into the potential energy of the face O into the potential energy of the glove and arm T 4- 6 Y 17 + & J 7 90 8 * 8 U I 이 144 ( 9 110 DII O E DDI I P 2 { 4 ( ← backsDiscuss whether any work is being done by each of the following agents and, If so, whether the work is positive or negative. (a) a chicken scratching the ground A chicken does work on the ground. O The ground does work on the chicken. No work is done. Is the work positive or negative? The work is positive. The work is negative. No work Is done. (b) a person studying (holding up a book but not moving it) • The person does work on a book. O The book does work on the person. No work is done. Is the work positive or negative? The work is positive. The work is negative. No work is done. (c) a crane lifting a bucket of concrete The crane does work on the bucket. The bucket does work on the crane. No work is done. Is the work positive or negative? The work is positive. The work is negative. No work is done. (d) the force of gravity on the bucket in part (c) O The bucket does work on gravity. MacBook AirIn the figure, a frictionless roller coaster car of mass m - 992 kg tops the first hill with speed vo- 11.9 m/s at heighth-47.0 m. How much work does the gravitational force do on the car from that point to (a) point A, (b) point B, and (c) point C? If the gravitational potential energy of the car-Earth system is taken to be zero at C, what is its value when the car is at (d) Band (e) A? First
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