1. You throw a ball straight up. You are feeling extra strong today. It takes 11 seconds for the ball to come back down. a. How high did you through it?

b. What was the initial speed you threw it at?

2. You drop a large rock from a 19 story building. It is 78 meters high. The wind is blowing from the southwest at 3.5 m/s.

What is the initial velocity of the rock?

How long will it take to hit the pile of leaves that are sitting below?

In a heat engine if 1000 j of heat enters the system the piston does 500 j of work, what is the final internal energy of the system if the initial energy was 2000 j? 1. write the equation 2.list out your known variables 3.plug the numbers into the equations 4.solve 5.write your solution statement that includes initial energy and final

Suppose a wire with a current is pushed upward by a magnetic field. how would the wire move if the direction of the current reversed? explain your answer.

Electric field of the earth. the earth has a net electric charge that causes a field at points near its surface equal to 150 n> c and directed in toward the center of the earth. (a) what magnitude and sign of charge would a 60-kg human have to acquire to overcome his or her weight by the force exerted by the earth’s electric field? (b) what would be the force of repulsion between two people each with the charge calculated in part (a) and separated by a distance of 100 m? is use of the earth’s electric field a feasible means of flight? why or why not?