A conical pendulum is formed by attaching a 500 g ball to a 1.0 m long string, then allowing the mass to move in a horizontal circle of radius 20 cm as shown
in FIGURE 5. Calculate
the tension in the string.

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)