Two life preservers have identical volumes, one filled with Styrofoam and the other filled with sand. When both are fully submerged, the buoyant force is greater on the one filled with
A) Styrofoam.
B) sand.
C) same on each if volumes remain the same.
Answer: C
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Radio waves, of sufficient frequency, pass through which of the following ion layers?
a. C b. D c. E d. F
A car travels along east and its velocity decreases. The acceleration of the car is in which of the following directions?
A) Eastward B) Westward C) Northward D) Southward E) Cannot be determined without additional information.
A bimetallic beam of aluminum (Ea 5 70 GPa) and copper (Ec 5 110 GPa) strips has a width of b 5 25 mm; each strip has a thickness of t 5 1.5 mm. A bending moment of 1.75 N?m is applied about the z axis. The ratio of the maximum stress in aluminum to that in copper is approximately:
(A) 0.6
(B) 0.8
(C) 1.0
(D) 1.5
Two long parallel wires that are 0.40 m apart carry currents of 10 A in opposite directions
What is the magnetic field strength in the plane of the wires at a point that is 20 cm from one wire and 60 cm from the other? (?0 = 4? × 10-7 T ? m/A) A) 3.3 µT B) 67 µT C) 33 µT D) 6.7 µT