英语翻译1)A baseball pitcher throws a fastball at a speed of 44m/s.The acceleration occurs as the picher holds the ball in his hand and moves it through an almost staight-line distance of 3.5m.Calculate the acceleration,assuming that it's constan
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英语翻译1)A baseball pitcher throws a fastball at a speed of 44m/s.The acceleration occurs as the picher holds the ball in his hand and moves it through an almost staight-line distance of 3.5m.Calculate the acceleration,assuming that it's constan
英语翻译
1)A baseball pitcher throws a fastball at a speed of 44m/s.The acceleration occurs as the picher holds the ball in his hand and moves it through an almost staight-line distance of 3.5m.Calculate the acceleration,assuming that it's constant and uniform.Compare this acceleration to the acceleration due to gravity.
2)A weather balloon is floating at a constant height above Earth when it releases a pack of instruments.
a)If the pack hits the ground with a velocity of -73.5m/s,how far did the pack fall?
b)How long did it take for the pack to fall?
英语翻译1)A baseball pitcher throws a fastball at a speed of 44m/s.The acceleration occurs as the picher holds the ball in his hand and moves it through an almost staight-line distance of 3.5m.Calculate the acceleration,assuming that it's constan
1、s=v^2/2a,即3.5=44^2/2a,a=44^2/7=276.6m/s^2>>g
2、h=v^2/2g=73.5^2/2g=275.6m
t=v/g=73.5/9.8=7.5s
yes
1)设加速度a 则 v²=2aS S=3.5 v=44 a=276.57m/s² 所以a>g(重力加速度)
2)
a)v²=2gS v=-73.5m/s g=9.8m/s² S=275.63m The pack falls about 275.63m
b)v=gt t=7.5s It takes 7.5s to fall。