A particle is projected vertically upwards with speed 24.5m s-1 .Find the total time for which it is 21m or more above its point of projection 相关知识点: 试题来源: 解析 一个粒子投影垂直向上的速度24.5m S-1.找到它的总时间是2100万以上的点的投影 结果一 题目 大神们我快哭了!帮帮 求求!...
A particle is projected vertically upwards with speed 24.5m s-1 .Find the total time for which it is 21m or more above its point of projection 相关知识点: 试题来源: 解析 一个粒子投影垂直向上的速度24.5m S-1.找到它的总时间是2100万以上的点的投影 结果一 题目 大神们我快哭了!帮帮 求求!...
At time t = 0, a particle of mass m is projected vertically upwards with speed U.The particle is subject to air resistance of magnitude, where v is the speed of the particle at time t and k is a positive constant.Show that the particle reaches its greatest height, H, above the point...
At time r = 0, a particle of mass m is projected vertically upwards with speed U.The partic subjectto arresistance of magnitude, where vi the speed of the particle attime r and k is a positive constant.Show thatthe particle reaches its greatest height, H, above the point of projection...
Please complete the following questions (1)A particle of mass 0.4 kg is projected vertically upwards with a speed of 20 ms^(-1). The particle experiences a resistance of 0.5v, where v is the velocity of the particle. ①Find the time taken for the particle to come to instantaneous rest....
4. A small stone is projected vertically upwards from the point O and moves freely under gravity. The point A is 3.6 m vertically above O. When the stone first reaches A, the stone is moving upwards with speed 11.2 m s-1. The stone is modelled as a particle.(a)Find the maximum hei...
结果1 题目 A particle is projected in a straight line from a point O. After t seconds its displacement, s metres, from O is given by s = 3t2 - t3.Find the times when the body is instantaneously at rest. 相关知识点: 试题来源: 解析 t = 0, 1s t=2;4s 反馈 收藏 ...
Give non-exact numerical answers correct to3significantfigures,or1decimal place in the case of angles in degrees,unless a different level of accuracy is specified in the question.Where a numerical value is necessary,take the acceleration due to gravity to be10m s−2.At the end of ...
题目【题目】A particle is projected from a point which is 2 m above ground level with avelocity of 40ms-' at an angle of 45" to the horizontal. Find its horizontaldistance from the point of projection when it hits the ground.y44020245202 相关知识点: ...
1 A particle is projected with speed 17ms- at an angle of 50 above the horizontal from a point on horizontal ground. Calculate the speed of the particle 2 s after the instant of projection.[3] 相关知识点: 试题来源: 解析 17sin50-2g v2= (17 sin 50 - 2 g)2 +(17 cos 50)2 v ...