Q1 a man pulls a crate of mass 750 kg across a level floor, Ask an Expert

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Q1. A man pulls a crate of mass 75.0 kg across a level floor. He pulls with a force of 180.0 N at an angle of 26.0° above the horizontal. When the crate is moving, the frictional force between the floor and the crate has a magnitude of 130.0 N. If the crate starts from rest, how fast will it be moving after the man has pulled it the distance of 2.80 m?

Q2. A 6.2 cm diameter wire coil is at first oriented so that its plane is vertical to a magnetic field of 0.63 T pointing up. Throughout the course of 0.10 s, field is changed to one of 0.25 T pointing down. What is an average induced emf in the coil?

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