Three resistors having resistances of 4.0 ?, 6.0 ?, and 10.0 ? are connected in parallel. If the combination is connected in series with an ideal 12-V battery and a 2.0-? resistor, what is the current through the 10.0-? resistor?
A) 0.59 A
B) 2.7 A
C) 6.4 A
D) 11.2 A
E) 16 A
A
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A cylindrical tank is assembled by welding steel sections circumferentially. Tank diameter is 1.5 m, thick- ness is 20 mm, and internal pressure is 2.0 MPa. The maximum tensile stress in the cylindrical part of the tank is approximately:
(A) 45 MPa
(B) 57 MPa
(C) 62 MPa
(D) 75 MPa
A crane lifts a 425 kg steel beam vertically a distance of How much work does the crane do on the beam if the beam accelerates upward at 1.8 m/s2? Neglect frictional forces
A) 5.8 × 105 J B) 3.4 × 105 J C) 4.0 × 105 J D) 4.9 × 105 J
What could happen in planetary systems where the nebular gas is quickly disbursed?
A) No terrestrial planets would form. B) The only planets would be more massive than Jupiter. C) Many planets would be destroyed by migration onto the central star. D) Large ice-rich planetesimals would not be able to gather hydrogen and helium and become gas giants.
The plastic-like substratum on which the lithospheric plates move is called the
a. outer core. b. endosphere. c. isosphere. d. asthenosphere.