Is the decay ?+ ? p + ?+ allowed?
A) No, because lepton number is not conserved.
B) No, because mass is created.
C) Yes, because it conserves energy.
D) No, because charge is not conserved.
D
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A plane truss composed of two steel pipes (E 5 210 GPa, d 5 100 mm, and wall thickness 5 6.5 mm) is subjected to vertical load W at joint B. Joints A and C are L 5 7 m apart. The critical value of load W for buckling in the plane of the truss is nearly:
(A) 138 kN
(B) 146 kN
(C) 153 kN
(D) 164 kN
Two astronauts, of masses 60 kg and 80 kg, are initially right next to each other and at rest in outer space. They suddenly push each other apart. What is their separation after the heavier astronaut has moved 12m?
A) 9.0 m B) 16 m C) 21 m D) 24 m E) 28 m
Consider an apple falling from a tree. Which of the following applies to this situation?
A. Earth is attracting the apple. B. The apple is attracting Earth. C. Earth is attracting the apple; the apple is not attracting Earth. D. The apple is attracting Earth and Earth is attracting the apple.
Two charges of 15 pC and -40 pC are inside a cube with sides that are of 0.40-m length. Determine the net electric flux through the surface of the cube
a. +2.8 N × m2/C b. -1.1 N × m2/C c. +1.1 N × m2/C d. -2.8 N × m2/C e. -0.47 N × m2/C