23. Calculate the wire diameter of a steel spring that could support a load of 50 kg. Allowable working stress is 427 x 10 N/m², the spring mean diameter is to be 44.45 mm and G-79.3 Gpa. A. 0.2106 in B. 0.3028 in C. 0.3924 in D. 0.6931 in

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In the figure below, a metal bar sitting on two parallel conducting rails, connected to each other by a resistor, is pulled to the right at a constant speed. The resistance R = 6.00 Q, the distance between the rails is { = 1.20 m, and a uniform 2.30 T magnetic field is directed into the page. At what speed (in m/s) should the bar be moved to produce a current of 0.500 A in the resistor? R Fapp m/s

A steel rod 20 mm in diameter and 120 mm long is joined to the end of a copper rod 20 mm in diameter and 80 mm long, thus forming a composite rod of 200 mm in length. If the ends of the composite rod are now clamped, calculate the stress set up in the steel and copper due to a temperature increase.

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The figure below shows a 114-turn square coil rotating about a vertical axis at at -1,770 rev/min. The length of a side of the coil is 20.0 cm. The horizontal component of the Earth's magnetic field at the coil's location is equal to 2.00 x 10-5 T. 20.0 cm 20.0 cm (a) What is the magnitude of the maximum emf (in mV) induced in the coil by the Earth's magnetic field? mV (b) What is the orientation of the coil with respect to the magnetic field when the maximum emf occurs? O The plane of the coil is parallel to the magnetic field. The plane of the coil is perpendicular to the magnetic field. ○ The plane of the coil is oriented 45° with respect to the magnetic field.

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