49. ( )
50. V, (
) 
51. ()
52. ()
53. ( )
54. 
/ ( )
55. (=+vt; y=y; z=z; t=t)
56. ( )
57. ( , )
58. (
) x y z v t , , - .
59. , ( , )
60. ( , . )
61. ( . )
62. , m- (E=mc )
63. , ( . )
64. . 1,2,3,4 (0; π/6 ; π/2 ; 3π/2 )
65. , (1, 0,02, 50)
66. (π , 5)
67. 
. ( , y)
68. , 2 . ( 4 )
69. x=0,1sin(10t+π/2). t=0 (0/)
70. , , ( , )
71. x=0,01sin(10t+π). t=0 (0,1/) ,
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72. , 16 ( 4 )
73. 2 ( 
)
74. 4 ( 2 )
75. 6 . , , ( 
)
76. , 9 . ( 3 )
77. ( , )
78. , . ( )
79. ( 16 2*10 
)
80. , ( , )
81. , . , . (=2)
82. λ , , . (ℓ1 ℓ2) (ℓ1= ℓ2=)
83. ( 1/12 )
84. , ( 1 )
85. (, )
86. , ( )
87.
88. ( )
89. : , , ( )
90.
91. (
) n- , v-
92. ( , )
93. , , (1/2kT)
94. (
)
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95. , , ( )
96. ( )
97. ( )
98. ( )
99. : , ( )
100. , ( , )
