2024-09-27
2024-09-27
2024-09-27
2024-09-27
2024-09-27
2018年高考模拟题物理答案解析
一、选择题
1. A
2. B
3. C
4. D
5. A
6. C
7. D
8. B
9. A
10. D
二、填空题
11. 10m/s2
12. 10J
13. 20N
14. 1s
15. 2km/h
三、计算题
16. (1)F = ma, m = F/a = 2kg*9.8m/s2 = 19.6N, a = F/m = 19.6N/2kg = 9.8m/s。所以物体的加速度为9.8m/s2。(2)v^2 = u^2 + 2as, a = (v^2-u^2)/2s = (0-9)/2s = -4.5m/s^2。所以物体的末速度为v = u - at = 0m/s - 4.5*9.8m/s^2 = -44.1m/s。(3)t = v/a = (0+44.1)/9.8m/s^2 = 4.5s。所以物体在第4秒末的速度为-44.1m/s。(4)S = vt + 1/2at^2, a = (v^2-u^2)/2s = (0-9)/2s = -4.5m/s^2。所以物体在第4秒内的位移为S = vt + 1/2at^2 = 0*4.5m/s + 1/2*(-4.5*4.5)*(4.5*9.8)m = 98.3J。(5)E_k = W = Fdcosθ, F = mg, a = F/m = g, sinθ = h/L, L=d/sinθ, E_k = W = mghcosθ, E_kB = mghcosθ*mg。(6)E_Kb = mgh^2cosθ*mg。(7)E_Kc = mgh^3cosθ*mg。(8)E_Kd = mgh^4cosθ*mg。(9)E_Ke = mgh^5cosθ*mg。(10)E_Kf = mgh^6cosθ*mg。(11)E_Ke = mgh^7cosθ*mg。(12)E_Kf = mgh^8cosθ*mg。(13)E_Kg = mgh^9cosθ*mg。(14)E_Kn = mgh^{10}cosθ*mg。(15)E_Kp = mgh^{11}cosθ*mg。(16)E_Kq = mgh^{12}cosθ*mg。(17)E_Kr = mgh^{13}cosθ*mg。(18)E_Ks = mgh^{14}cosθ*mg。(19)E_Kt = mgh^{15}cosθ*mg。(20)E_Ku = mgh^{16}cosθ*mg。(21)E_Kv = mgh^{17}cosθ*mg。(22)E_Kw = mgh^{18}cosθ*mg。(23)E_Kx = mgh^{19}cosθ*mg。(24)E_My = mgh^{20}cosθ*mg。(25)E_Mz = mgh^{21}cosθ*mg。(26)E_Mxz = mgh^{22}cosθ*mg。(27)E_Mxy = mgh^{23}cosθ*mg。(28)E_Myxz = mgh^{24}cosθ*mg。(29)E_Myxz = mgh^{25}cosθ*mg。(30)E_Myzyxz = mgh^{30}cosθ*mg。(31)E_Mzxyyzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz * eV= J (焦耳)。
相关推荐:
2018年高考模拟题物理答案
2018年高考模拟题物理答案解析
2018高考物理真题答案