(1)把开关、分别掷于a、b,将导轨与电源相连,弹丸运动到MN边界时已达到最大速度,求:
①最大速度大小;
②到达最大速度的过程中,流过弹丸的电荷量;
(2)将弹丸放回原先位置,先把开关掷于c,断开,让电源给电容器充电。稳定后,再将断开,把开关掷于d,弹丸能打穿沙层。求出弹丸穿过沙子到达PQ时的速度大小。
同类型试题
y = sin x, x∈R, y∈[–1,1],周期为2π,函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x, x∈[–1,1], y∈[–π/2,π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2
y = sin x, x∈R, y∈[–1,1],周期为2π,函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x, x∈[–1,1], y∈[–π/2,π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2