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 ...
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...
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 at time, T,whereT=k/gln((k+U))/k ...
2 A particle of mass 0.8 kg is projected with a speed of 12ms up a line of greatest slope of a rough plane inclined at an angle of 10° to the horizontal. The coefficient of friction between the particle and the plane is 0.4.(i) Find the acceleration of the particle.[4] (ii) Fi...
4. A particle P of mass 2m is moving in a straight line with speed u on a smooth horizontal plane. The particle P collides directly with a particle Q, of mass m, which is moving on the plane along the same straight line as P but in the opposite direction to P. Immediately before...
4 A particle P of mass 2m, moving on a smooth horizontal plane with speed u, strikes a fixed smooth vertical barrier. Immediately before the collision the angle between the direction of motion of P and the barrier is 60°. The coefficient of restitution between P and the barrier is . Sho...
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2 A particle has an initial speed v along the 0-x direction as shown in Fig. 2 a.Y。 ”,I Fig. 2a Fig. 2b0After some time, it travels with the same speed v in a direction perpendicular to its original direction as shown in Fig. 2 b. Which of the following shows the direction...