神马作文网英文物理题 求解答,非常感谢
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英文物理题 求解答,非常感谢
Santonio Holmes, a NY Jets wide receiver, starts on the hash mark on the right side of the field. When the ball is snapped, he runs 10 yards directly towards the goal and then runs a slant at an angle of 60 degrees with respect to the hash marks (i.e. 30 degrees with respect to the yard lines) towards the right sideline, where he makes a spectacular one-handed diving catch of the ball thrown by rookie QB Geno Smith. What is Santonio's displacement from the starting point when he makes his catch right at the sideline? (The hash marks are 70 feet, 9 inches from the sidelines.)
Santonio Holmes, a NY Jets wide receiver, starts on the hash mark on the right side of the field. When the ball is snapped, he runs 10 yards directly towards the goal and then runs a slant at an angle of 60 degrees with respect to the hash marks (i.e. 30 degrees with respect to the yard lines) towards the right sideline, where he makes a spectacular one-handed diving catch of the ball thrown by rookie QB Geno Smith. What is Santonio's displacement from the starting point when he makes his catch right at the sideline? (The hash marks are 70 feet, 9 inches from the sidelines.)
Solve：
AC = 70.75 （feet）= OD；
CD = AO = 10 （yard）= 30 （feet）
BC = AC× ctg∠ABC = 70.75 × ctg60° = 40.85 (feet)
thus BO = (OD^2 + BD^2)^0.5 = (70.75^2 + 70.85^2)^0.5 = 100.13 (feet)
有什么不明白的可以接着问.手绘手打,