The helicopter in the drawing is moving horizontally to the right at a constant velocity.The weight of the helicopter is W=53800N.The lift force L generated by the rotating blade makes an angle of 21.0 degree with respect to the vertical.(a) What is

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The helicopter in the drawing is moving horizontally to the right at a constant velocity.The weight of the helicopter is W=53800N.The lift force L generated by the rotating blade makes an angle of 21.0 degree with respect to the vertical.(a) What is
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The helicopter in the drawing is moving horizontally to the right at a constant velocity.The weight of the helicopter is W=53800N.The lift force L generated by the rotating blade makes an angle of 21.0 degree with respect to the vertical.(a) What is
The helicopter in the drawing is moving horizontally to the right at a constant velocity.The weight of the helicopter is W=53800N.The lift force L generated by the rotating blade makes an angle of 21.0 degree with respect to the vertical.
(a) What is the magnitude of the lift force?
(b) Determine the magnitude of the air resistance R that opposes the motion
丨 /L
丨 /
丨21度 /
丨 / v
R
丨
丨
丨
W
A cable is lifting a construction worker and a crate,as the drawing shows.The weights of the worker and crate are 965 and 1510 N,respectively.The acceleration of the cable is 0.620m/s^2,upward.What is the tension in the cable.
(a) Below the worker and
(b) Above the worker?
第二题是向上作加速运动

The helicopter in the drawing is moving horizontally to the right at a constant velocity.The weight of the helicopter is W=53800N.The lift force L generated by the rotating blade makes an angle of 21.0 degree with respect to the vertical.(a) What is
问题的意思就是:一架直升机匀速向右飞行.受的是螺旋桨的斜向右(与垂直角度偏21度)的拉力.问拉力的大小和相应空气阻力R是多少.
所以
答案:拉力L=53800/cos21
阻力R=53800tg21 阻力与拉力的水平分力相等
第二题 哦,那就好了
是讲一个绳缆拽着一个工人和一个箱子.因为是向上作加速运动.问绳缆的张力是多大,方向是在工人上头,还是下面.
则张力tension=mg+ma=[(1510+965)/g]*(g+a)
其中m=(1510+965)/g,g=9.8m/s^2
方向向上,选(B)

拜托,直接杀了我吧!牛顿还好,你整啥子英文!

大哥,不懂英文! - -!

阅读书虫系列,生存游戏Complete these sentences using the following words:Complete these sentences using the following words:cold,deep,fires,helicopter,houses,Mountains,plane,river,safe,snow,valley,walks.Chris is in a small____going across th helicopter Who designed the first helicopter,Who_the most famous pictures in the worldA tookB madeC paintedD invedted in the 19th是什么意思 in the 16th century什么意思 in the 20th century是什么意思 Europe in the 18th century是什么意思 Realistic novel in the 18th century don't charging when the helicopter power switch is in the'' ON ''position什么意思这是遥控飞机说明书上的,关于充电的, dont charging when the helicopter power switch is in the on position什么意思这是遥控飞机说明书上的,关于充电的, 英译中 in the 1950s in the 19th century in the 19th 和in the 1980's The helicopter in the drawing is moving horizontally to the right at a constant velocity.The weight of the helicopter is W=53800N.The lift force L generated by the rotating blade makes an angle of 21.0 degree with respect to the vertical.(a) What is in 18th century 要不要加the变成in the 18th century The 16th Asian Games _____ in November in China look at sb in th mirror,in the local mine Falls In love th you in the together feel in the second half of the 19th century