A student is using a 98 ohm resistor to build a circuit with a voltage source. If the student needs 0.54 amperes of current to flow through the resistor, what voltage should be used?

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)