解析 Therefore the horizontal distance of the particle from O when it hits the ground is 165 m.gx2sec3a Using the equation of the path y = x tana- gives y=x-(gx^2)/(1600) We require the value of x when y =-2 So -2=x-(8x^2)/(1600) 49x^2-8000x-16000=0 中 x=165 ...
A particle is projected with speed 15 ms-' at an angle of 40 above the horizontal from a point on horizontal ground. Calculate the time taken for the particle to hit the ground. 相关知识点: 试题来源: 解析 1.930=(15sin40°)t-gt^2/2 t=1.93 ...
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 ...
②Find the distance travelled as a function of t and hence show that the time taken for the particle to drop down to ground level is greater than the time taken to reach its highest point. 相关知识点: 试题来源: 解析 (1) ①νmber(1.002) s ②7.98 m (2) ①v=8(1-^(-1.25t))...
A 2-kg particle is projected from a table of height 3 m, with a speed 5 m/s. What is the mechanical energy of the particle as it drops down to the height 2 m. ()A..2 JB.33.8 JC.83.8 JD.44.6 J的答案是什么.用刷刷题APP,拍照搜索答疑.刷刷题(shuashuati.com)
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1【题目】A particle P i initially at a fixed origin O. At time r= 0. P s projected from O and movesso that, at time seconds after projection,its position vector r m relative to O is given byr=(-12r)i+(4r2-6r)j. r ≥0Find:the position vector of P at the instant when Pi...
e,f, Measured transmission spectrum (e) and calculated projected band (f) when the device works at θ = 0.08π. There are five bulk bands in one FSR, distinct from the three-particle model in a square lattice. The winding numbers \({{{\mathcal{W}}}\) in all bulk bandgaps are...
Within the uncertainties, all these observations are compatible with the predictions of the standard model of elementary particle physics. Much evidence points to the fact that the standard model is a low-energy approximation of a more comprehensive theory. Several of the standard model issues ...