A race car starts from rest on a circular track of radius 400 m. Its speed increases at the constant rate of 0.500 m/s2 . At the point where the magnitudes of the radial and tangential accelerations are equal, determine (a) the speed of the race car, and (b) the elapsed time
14.1 m/s, 28.3 s
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You intend to move a rectangular loop of wire into a region of uniform magnetic field at a given speed so as to induce an emf in the loop. The plane of the loop must remain perpendicular to the magnetic field lines. In which orientation should you hold the loop while you move it into the region with the magnetic field to generate the largest emf?
1.with the long dimension of the loop parallel to the velocity vector 2.with the short dimension of the loop parallel to the velocity vector 3.Either way because the emf is the same regardless of orientation.
What is the shape factor?
What will be an ideal response?
An architect wants to use glass in a highly tensile stressed critical application on the exterior of a building, and you are asked to select a suitable material. The best solution for this request is to:
(a) Use tempered glass (b) Flame treat the outer surface of the glass to eliminate all scratches and cracks (c) Use the highest strength glass available (d) Suggest a redesign with another material
The presence of a magnetic field is a good indication that
A) the Earth's interior is similar to Mercury's, as both have fields. B) a huge iron meteorite lies somewhere high up in the mantle, not in the core. C) the Earth has a liquid metal outer core, spinning rapidly as it rotates. D) the Earth's interior has had time to solidify, with a rigid bar magnet created. E) the Earth's interior must be completely molten to the center.