3. The sketch to the right shows a proposed "electromagnetic rocketlauncher". A metal bar is attached with very low friction to the metallaunch frame, and an electric current flows around the loop as shown.A constant magnetic field is applied to the loop to make the metal baraccelerate upward, and when the bar hits the stops at the end of therails, the rocket is launched.(a) Determine the direction of the magnetic field so that the metal barfeels an upward force.(b) Suppose you want to use this device to launch a model rocket at an initial speed of 40 m/s. Whatacceleration must the rocket have so that it attains the speed of 40 m/s over 2 m? You may find ituseful to remember the kinematics equation ²V =0 +2a (Ay).22(c) How long would it take the launcher to accelerate the rocket from rest to 40 m/s at the rate youfound in part (c)?

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Answered: 3. The sketch to the right shows a…

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