### What is the average induced emf in the coil

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Q1. A projectile is fired with an initial speed v at an angle of 30 degrees above the horizontal from a height of 40meters above the ground. The projectile strikes the ground with a speed of 1.2v. Find v.

Q2. An 8.10 cm diameter wire coil is initially oriented so that its plane is perpendicular to a magnetic field of 0.710 T pointing up. Throughout the course of 0.16 s, the field is changed to one of 0.280 T pointing down. What is the average induced emf in the coil?

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