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3. The sketch to the right shows a proposed "electromagnetic rocket launcher". A metal bar is attached with very low friction to the metal launch frame, and an electric current flows around the loop as shown. A constant magnetic field is applied to the loop to make the metal bar accelerate upward, and when the bar hits the stops at the end of the rails, the rocket is launched. (a) Determine the direction of the magnetic field so that the metal bar feels an upward force.

3. The sketch to the right shows a proposed "electromagnetic rocket launcher". A metal bar is attached with very low friction to the metal launch frame, and an electric current flows around the loop as shown. A constant magnetic field is applied to the loop to make the metal bar accelerate upward, and when the bar hits the stops at the end of the rails, the rocket is launched. (a) Determine the direction of the magnetic field so that the metal bar feels an upward force.

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