The late news reports the story of a shooting in the city. Investigators think that they have recovered the weapon and they runballistics tests on the pistol at the firing range, If a 0.050-kg bulletwere fired from the hand gun with a speed of 400 m/s and it traveled 0.080m into the target before coming to rest, what force did the bullet exerton the target?

Alead ball is dropped into a lake from a diving board 5m above the water . it hits the water with a certain velocity and then sink with constant velocity in bottom . it reaches the bottom 5 second after it is dropped if g= 10m/s2 . find depth of the lake and average velocity of the ball ?

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?

In which of these cases are the two wave points considered to be in phase with each other?