Find the ratio of vb to vr where vr is defined above and vb, Ask an Expert

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Q. A river flows at a speed vr = 4.17 km/hr with respect to the shoreline. a boat needs to go perpendicular to the shoreline to reach a pier on the rivers other side. to do so the boat heads upstream at an angle theta = 30 from the direction to the boats pier. find the ratio of vb to vr, where vr is defined above and vb is the boats speed with respect to the water.

Q. A circular loop in the plane of the screen lies in a 0.87 T magnetic field pointing into the screen. If the loop's diameter changes from 19.5 cm to 6.0 cm in 0.50 s, determine the following.

(a) What is the magnitude of the average induced emf?

(b) If the coil resistance is 2.5 , what is the average induced current?

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