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Find the mass of 50 mL of water if the density of water is 1 g/mL

What happens in a global convection cell

Ahot-air balloon takes off from the ground traveling vertically with a constant upward acceleration of magnitude g/4. after time interval δt, a crew member releases a ballast sandbag from the basket attached to the balloon. how many seconds does it take the sandbag to reach the ground? (express your answer in terms of δt)

The direction of the current in an alternating current circuit remains constant. is direct. changes repeatedly. changes randomly.