A mass of 3 kg is moving with a velocity of 0.25 m/s. An unbalanced force is applied and increases the velocity to 0.45 m/s. The work done by the unbalanced force is
a) 0.34 J
b) 0.84 J
c) 0.21 J
d) 1.2 J
c
Physics & Space Science
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Two large non-conducting plates of surface area A = 0.25 m2 carry equal but opposite charges Q = 75 ?C. What is the energy density of the electric field between the two plates?
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A thin sheet of plastic (n = 1.60) is inserted between two panes of glass to reduce infrared (? = 700 nm) losses. What thickness (in nm) is necessary to produce constructive interference in the reflected infrared radiation?
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Physics & Space Science