A ball with a diameter of 20.00 cm is placed in water with 75% of its volume out of the water. The buoyant force of the water on the ball is
A. 16.67 N.
B. 14.75 N.
C. 13.60 N.
D. 12.56 N.
E. 10.26 N.
E. 10.26 N.
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The angular separation of two stars is 0.1 arcseconds and you photograph them with a telescope that has an angular resolution of 1 arcsecond. What will you see?
A) The two stars will appear to be touching, looking rather like a small dumbbell. B) The stars will not show up at all in your photograph. C) The photo will seem to show only one star rather than two. D) You will see two distinct stars in your photograph.
A car rolls down an incline starting from rest. A graph of position versus time is made for this motion. One can get the
A. distance traveled from the slope of the graph. B. instantaneous velocity from the slope of the graph. C. acceleration from the area under the graph. D. acceleration from the slope of the graph. E. velocity from the area under the graph.
Lenz's Law: Two solenoids are close to each other, as shown in the figure, with the switch S open. When the switch is suddenly closed, which way will the induced current flow through the galvanometer in the left-hand solenoid?
A. from left to right B. from right to left C. There will be no induced current through the galvanometer.
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