A cannon fires a 0.292 kg shell with initial velocity vi = 8.2 m/s in the direction θ = 45 ◦ above the horizontal. The shell’s trajectory curves downward because of gravity, so at the time t = 0.643 s the shell is below the straight line by some vertical distance ∆h. Find this distance ∆h in the absence of air resistance. The acceleration of gravity is 9.8 m/s 2 . Answer in units of

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Electric Charges and Fields

One of the fundamental properties is the electromagnetic property. Charge cannot be destroyed by any process and this contributes formally to the law of charge conservation.