Suppose, you are in a sporting event. You notice that everyone stands up when it's his turn, creating a wave that moves through the crowd and they sit back down again after a while. This wave move around the stadium without moving the people around it. Considering this situation, justify your answer about nature of wave.

If the force applied to an object remains constant, is more power needed for the object to move faster ? explain

Farmer a has a deep well and needs a lot of water for her animals and crops. her neighbor, farmer b, has a shallower well. he needs less water than farmer a because his farm is smaller. in years of drought, sometimes farmer b can't get any water from his wells. what can farmer b do to decrease the likelihood of his well running dry?

It's time for santa to deliver his presents. assuming he delivers presents all over the world, he has to travel about 75,000,000 miles. if he travels east to west, he can use the time zones to make christmas day last 31 hours. what speed, in miles per hour, must santa fly to get all of his presents delivered?