The hammer throw is a track-and-field event in which a 7.3 kg ball (the “hammer”), starting from rest, is whirled around in a circle sev- eral times and released. it then moves upward on the familiar curving path of projectile motion. in one throw, the hammer is given a speed of 29 m/s. for comparison, a .22 caliber bullet has a mass of 2.6 g and, start- ing from rest, exits the barrel of a gun at a speed of 410 m/s. determine the work done to launch the motion of (a) the hammer and (b) the bullet.

The magnitude of the magnetic field at a certain distance from a long, straight conductor is represented by b. what is the magnitude of the magnetic field at twice the distance from the conductor? a. at twice the distance, the magnitude of the field is 4b.b. at twice the distance, the magnitude of the field is 2b.c. at twice the distance, the magnitude of the field is b/2.d. at twice the distance, the magnitude of the field is b/4.e. at twice the distance, the magnitude of the field remains equal to b.