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The sun delivers 10³ w/m2 of electromagnetic flux to the earth’s surface. The total power that is incident on a roof of dimensions 8m × 20m, will be___________
6.4 × 10³W
3.4 × 10⁴W
(1.6 × 10⁵W
none of these
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The focal length of convex lens is 5 cm. Its magnifying power for minimum distance of distinct vision will be ____________
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A block of mass M is attached to the lower end of a vertical spring. The spring is hung from a ceiling and has force constant value k. The mass is released from rest with the spring initially unstretche the maximum extension produced in the length of the spring will be_______________
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