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Q1. While a roofer is working on a roof that slants at 39.0 degrees above the horizontal, he accidentally nudges his 93.0 N toolbox, causing it to start sliding downward, starting from rest.
If it starts 4.50 m from the lower edge of the roof, how fast will the toolbox be moving just as it reaches the edge of the roof if the kinetic friction force on it is 18.0 N?
Q2. Two long, parallel wires, each with a mass per unit length of 38 g/m, are supported in a horizontal plane by 6.0 cm long strings, as shown in the figure below. Each wire carries the same current I, causing wires to repel each other so that an angle θ between the supporting strings is 16°.
(a) Are the currents in the same or opposite directions? Not enough information to decide opposite direction similar direction.
(b) Find out the magnitude of each current.
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A contact lens is made of plastic with an index of refraction of 1.36. The lens has an outer radius of curvature of +1.91 cm and an inner radius of curvature of +2.41 cm. What is the focal length of lens?
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A 16 cm x 16 cm square loop of wire lies in the xy-plane with its bottom edge on x-axis. The resistance of the loop is 0.490 ohms. A magnetic field parallel to the z-axis is given by B= 0.830 y^2 t, where B is in tesla, y in meters, and t in seconds...
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