To practice problem-solving strategy 28.1 magnetic-field calculations. consider a current-carrying wire of length l carrying a current of magnitude i from left to right. what is the magnetic field contribution dbâ at point p, with coordinates (x, y), due to the current element dlâ at point a, with coordinates (a,0)? assume that y is positive.

Calculate the heat capacity per object when the total energy is 4 quanta. (think of this in terms of increasing from 3.5 quanta of energy in the system to 4.5 quanta of energy in the system, if that were possible.) c4 = __ j/k/object

While goofing off at the ice skating rink, a student takes off her shoes and places each of them on the ice. her friend, a hockey player, then shoots a hockey puck at each shoe. the first puck immediately comes to rest after it collides with the left shoe. the second puck rebounds after it collides with the right shoe. if each hockey puck has the same incoming speed, which shoe has greater speed after the collision? the right shoe. both shoes have the same speed. the left shoe.

Which diagram correctly demonstrates the various forces acting on a ball moving horizontally with some speed?