A copper tube with wall thickness of 8 mm must carry an axial ten-sile force of 175 kN. The allowable tensile stress is 90 MPa. The minimum required outer diameter is approximately:
(A) 60 mm
(B) 72 mm
(C) 85 mm
(D) 93 mm
(C) 85 mm
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You walk 53 m to the north, then you turn 60° to your right and walk another Determine the direction of your displacement vector. Express your answer as an angle relative to east
A) 63° N of E B) 50° N of E C) 57° N of E D) 69° N of E
How many stars are there in our Solar System?
A. one B. nine C. a few hundred D. about ten million E. eight
If a nuclide has a decay constant of 0.765 × 10-6 s-1 and contains 3.0 × 1017 nuclei
(a) what is the half life? (b) what is its initial activity? (c) what is the activity after 12. days?
Case 1: An electron is released from rest in a uniform electric field. Case 2: A proton is released from rest in a uniform electric field of the same magnitude as in case 1 . How does the electric potential energy of the charge-field system behave in these cases?
a. In case 1 the potential energy increases, but in case 2 it decreases. b. In both cases, the potential energy increases. c. In case 1 the potential energy decreases, but in case 2 it increases. d. In both cases, the potential energy decreases.