As you travel up into the mountains, why do your ears pop

Why does the input force have to be greater than the force needed to lift the bale?

Aplane flies directly between two cities, a and b, which are separated by . from a to b, the plane flies into a headwind. on the return trip from b to a, the wind velocity is unchanged. the trip from b to a takes less than the trip from a to b. what is the airspeed of the plane, assuming it is the same in both directions

What type of nuclear decay causes the atomic number of an element to increase by 1?