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Q. A loaded grocery cart is rolling across a parking lot in a strong wind. You apply a constant force. You apply a constant force F = 26i - 45j to the cart as it undergoes a displacement s = 9.2i - 2.5j. How much work does the force you apply do on the grocery cart?

Q. The magnetic field of the earth at a certain location is directed vertically downward and has a magnitude of 50.0 µT. A proton is moving horizontally toward the west in this field with a speed of 6.40 106 m/s. What are the direction and magnitude of the magnetic force the field exerts on the proton?

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