A 2.0-kg pistol fires a 1.0-g bullet with a muzzle speed of 1000 m/s. The bullet

Question

A 2.0-kg pistol fires a 1.0-g bullet with a muzzle speed of 1000 m/s. The bullet then strikes a 10-kg wooden block resting on a horizontal frictionless surface. The block and the embedded bullet then slide across the surface, What is the kinetic energy of the bullet as it travels toward the block? 1.0J 500 J 1000 J 5000 J 10 000 J A 0.25-kg ball attached to a string is rotating in a horizontal circle of radius 0.5 m. If the ball revolves twice every second, what is the tension in the string? 2 N 5 N 7 N 10 N 20 N

Explanation / Answer

Question 9) given ,

Angular speed (w) = 2 rps

2 rps = (2*2) rad/s = 12.566 rad/s

Since the object is rotating in circular motion ,

Tension ( T) = m*r*w^2

T = 0.25*0.5*12. 566^2

T = 20 N

Therefore) answer ) option E) 20 N

Question 8) velocity of bullet before collision = 1000 m/s

Mass of bullet = 1 g = 0.001 kg

KE = (1/2)*m*v^2

KE = (1/2)*0.001*1000^2 = 500 J

Answer ) option b)

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