A physics student rests her backpack upon his shoulder. The backpack is suspended motionless by one strap from one shoulder
Which free-body diagram best represents this situation?
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Which is not true about oxygen-17 and oxygen-18?

Ametal ring 4.20 cm in diameter is placed between the north and south poles of large magnets with the plane of its area perpendicular to the magnetic field. these magnets produce an initial uniform field of 1.12 t between them but are gradually pulled apart, causing this field to remain uniform but decrease steadily at 0.240 t/s . (a) what is the magnitude of the electric field induced in the ring? (b) in which direction (clockwise or counterclockwise) does the current flow as viewed by someone on the south pole of the magnet?

Distinguish between linear momentum and angular momentum