Two students are experimentinh with magnets. When they first try to put the magnets together, the magnets repel each other. When one student flips over her magnet, the magnets suddenly snap together. Which fundamental force are the students observing? A. electromagnetic
B. gravitational
C. strong nuclear
D. weak nuclear

What is the length x of the side of the triangle below? (hint: use the cosine function)

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)

Language is not the only way that humans communicate. describe how we use sound, touch, chemicals, and sight to communicate. need answer asap