F N = tgα F f µ N tgα = = = = µ N N N P T P T tgα P tgα
R = C v S D
5 4 mx = ml 5 5 x = l 4 O 4 l
mv N x = N sinθ = R N y = N cosθ = mg v = R g tg A R = 5 v = 5 9.8tg75 = 3.5
70 0 8 0 B A 0 A C C 0 9 C B BD BD 0 C 0 AC AC OA OA = = = AB DE OD OA DA Vt H vt = H V = H h H h v H H h
mg sin30 = mg mg = ma a = g h = at, h = g t t = h g
T - Mg Ma T - M m g = M m a M a' = ( M + m )a - ( m M + m )g hat h = a t x = h - a t M x h M m a m M m g t = [( ) ( ) ] + + M m x = h at + ( M + m) ( ) ( M + m) gth M x h M m h m M m gt = + ( + ) ( + ) m x M m h m = + + M + m gt ( ) ( ) m x = M + m h + ( ) ( gt )
g M r = ( ) g M r M r g g g g M r 8 3 7 = ( ) = (. ) 6 6 6
F f m = M r F = mg = f m M r F = mg = f m M r g M r = ( ) g M r M r = 30, = M r g = 30 ( ) =. 65 g h = gt 0
h = gt h t t h = = ( ) h t t h H - h = gt H = g t H h gt h + gt = g( t + ) h t = g = 7 98 = 685..
H = 9.8 7. 85 = 30 H = gt t = H g t = 3 H 4 4 s t = H = 0.3 s = 4 4 v t = H =. s = v t = 3 H =.8 s = 3 4 4 v 3 3 3 t = H = 4.9 s = v 4 3 4 v v 45
h = Vy t gt 73. = 45 0 9. 8 0 = 779. 5 960 = 59. 5 h = U t - gt y U = h + y gt t h = + g( T + t ) T + t 59. 5 = + 98. 45 45 = 6 + 0.5 = 336.5 U =.4U y = 336.5. 4 = 47
h h = 0 V t - gt y v t = gt y l = V x t
P n P m
= 340 0 0 =.7 0 =.7 4-3
3 0 0.9 =. 0. 9
3 3 D - d 6 3 = 8.9 V = 500.03-0.9 = 3864 3.9
V = 5 V 0 5 5 h 5 l 5 l h 5 5 5
9 0 0 0 0 0 L O G O
0 9 50 = 45 0.44 50-45 = 5 0 45 =.5 0 0 0 0.05
R = 6 t = 830 R 0
N = V R
=
n = = c v