如图所示,一长平板车,在 t = 0 时从静止开始以 (SI)作加速直线运动。车上一质量 m = 5 kg 的物体位于车前 A 位置处,t = 0 时,物体开始滑动,物体与平板车间的滑动摩擦系数为 μ = 0.15。则物体相对于地面参照系的加速度为 m/s 2 。(重力加速度 g 取 10 m/s 2 )
【简答题】Figure 1 is a (1) _______________ chart, which shows the different forms of (2)_____________ used by students in the (3)____________School. The most popular form of transport for male students is the ...
【简答题】Figure 2 is a stress-strain diagram. 1) Label A) tensile strength, B) yield strength, C) plastic region, D) elastic region, E) Modulus of elasticity; 2) Is this stress-strain diagram for a ductile mat...