从地面以仰角θ斜向上抛一质量为m的物体,初速度为v0,不计空气阻

从地面以仰角θ斜向上抛一质量为m的物体,初速度为v0,不计空气阻力,取地面为零势能面,当物体的重力势能是其动能的3倍时,物体离地面的高度为()

答案


B
【试题分析】

相关题目

—Hello, may I have an appointment with the headmaster?    —_____. A. Sorr
—Hello, may I have an appointment with the headmaster?    —_____. A. Sorry, he is busy at the moment          B. No, you can’t C. Certainly, Wait a minute, please          D.
Now my father _____ his bike to work every day instead of driving.A. ride   
Now my father _____ his bike to work every day instead of driving.A. ride     B. rode     C. rides     D. will ride
 It is usually warm in spring, but it _____ be rather cold.        A
 It is usually warm in spring, but it _____ be rather cold.        A. can                     B. must                   C. should        
如图,在△ABC中,已知∠1=∠2,BE=CD,AB=5,AE=2,则CE= .  
如图,在△ABC中,已知∠1=∠2,BE=CD,AB=5,AE=2,则CE= .  
外耳道多毛症仅见于男性(a);人类抗维生素D佝偻病中,若
外耳道多毛症仅见于男性(a);人类抗维生素D佝偻病中,若患者为男性,则其女儿一定患此病(b).对a和b理解正确的是( ) A.a病基因位于X染色体
(3分)按已知的原子结构规律,82号元素X应是第___________周
(3分)按已知的原子结构规律,82号元素X应是第___________周期___________族元素,它的最高正价氧化物的化学式为______________。 
已知a、b为两条不同的直线,α、β为两个不同的平面,且a⊥α,b
已知a、b为两条不同的直线,α、β为两个不同的平面,且a⊥α,b⊥β,则下列命题中的假命题是(    ) A.若a∥b,则α∥β                     B.若
In the English language there are striking similarities to many of  the charac
In the English language there are striking similarities to many of  the characteristics  present  in Spanish,French,and German.So what are the things that make English so difficult for  fore

最新题目