What happened when red light and cyan light combine, what colour of light results?

Which is the correct symbol for an isotope of iodine with 53 protons and 78 neutrons?

Explain what happens at the saturation point when adding salt to water at room temperature.

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)