The hammer throw is a track and field event in which a 7.3-kg ball (the hammer),
ID: 1285755 • Letter: T
Question
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 several times and released. It then moves upward on the familiar curving path of the 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, starting 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 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 several times and released. It then moves upward on the familiar curving path of the 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, starting 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.Explanation / Answer
AS THE LAUNCHER IS IMPARTING KINETIC ENERGY TO THE BULLET AND THE HAMMER SO ,
WORK DONE BY LAUNCHER = KE IMPARTED
a) BULLET KE = .5*M*V^2=.5 * 2.6 *410^2= 218.530 J= WORK DONE TO LAUNCH
b) HAMMER KE=.5*M*V^2= .5 * 7.3 * 29^2 =3069.55 J = WORK DONE TO LAUNCH
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