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23 Nov 2019
1) A softball, of mass m = 0.22 kg, is pitched at a speed v0 = 28.3 m/s. Due to air resistance, by thetime it reaches home plate it has slowed by 10%. The distancebetween the plate and the pitcher is d = 14 m. Calculatethe average force of air resistance, Fair, that is exerted on theball during its movement from the pitcher to the plate.
___________. 2) A runnerreaches the top of a hill with a speed of 6.5 m/s. He descends 50 mand then ascends 28 m to the top of the next hill. His speed is now4.5 m/s. The runner has a mass of 87 kg. The total distance that the runnercovers is 372 m, and there is aconstant resistance to motion of 9.9 N. Use energy considerations to findthe work done by the runner over the total distance. _____________. pleasehelp thanks
1) A softball, of mass m = 0.22 kg, is pitched at a speed v0 = 28.3 m/s. Due to air resistance, by thetime it reaches home plate it has slowed by 10%. The distancebetween the plate and the pitcher is d = 14 m. Calculatethe average force of air resistance, Fair, that is exerted on theball during its movement from the pitcher to the plate.
___________.
2) A runnerreaches the top of a hill with a speed of 6.5 m/s. He descends 50 mand then ascends 28 m to the top of the next hill. His speed is now4.5 m/s. The runner has a mass of 87 kg. The total distance that the runnercovers is 372 m, and there is aconstant resistance to motion of 9.9 N. Use energy considerations to findthe work done by the runner over the total distance.
_____________.
pleasehelp
thanks
Hubert KochLv2
28 May 2019
