The three blocks in the figure are on a frictionless surface. If F = 48.0 N, m1 = 2.0 kg, m2 = 1.5 kg, and m3 = 3.5 kg, what is the tension in the cord?
a.
24.0 N
b.
6.86 N
c.
13.7 N
d.
32.0 N
a
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It is decided to electropolish a complex cast copper sculpture, because the surface is too complex for mechanical polishing, and the as-cast surface does not have the required appearance. Through experimentation with piece of copper, it is found that a current density of 1 A/cm2 produces the required appearance. It is estimated that the entire surface of the sculpture is 100 cm2 , and it is decided to electropolish the sculpture at 100 A of current. No more than 0.0001 m of copper should be removed from the sculpture, so that the design shape is not altered. Determine the maximum time for electropolishing if the process is 100 % efficient?
What will be an ideal response?
Three capacitors, of capacitance 5.00 ?F, 10.0 ?F, and 50.0 ?F, are connected in series across a 12.0-V voltage source. (a) How much charge is stored in the 5.00-?F capacitor? (b) What is the potential difference across the 10.0-?F capacitor?
What will be an ideal response?
If you double the absolute temperature of an object, it will radiate energy
A) 16 times faster. B) 4 times faster. C) 32. times faster. D) 8 times faster. E) 2 times faster.
Its more difficult to start moving a heavy carton from rest than it is to keep pushing it with constant velocity, because
A) The normal force is greater when the carton is at rest. B) ?s < ?k. C) Initially, the normal force is not perpendicular to the applied force. D) ?k < ?s. E) ?s = ?k.