1. A net force of 12 N changes the momentum of an object of a 250 g ball by 3.7 kg-m/s. The force acts for a) 0.31 s b) 0.81 s c) 1.2 s d) 3.2 s e) 44 s

Elements Of Electromagnetics
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1. A net force of 12 N changes the momentum of an object of a 250 g ball by 3.7 kg. m/s. The force
acts for
a) 0.31 s
b) 0.81 s
c) 1.2 s
2. A 1.5 kg bird is flying at a velocity of 18 m/s [22° above the horizontal]. The vertical component of its
momentum
a) 10 m/s [up]
b) 6.7 kg-m/s [up]
c) 25 kg m/s [up]
3. When you catch a fast-moving baseball, your hands hurts less if you move it in the direction of the ball
because
a) the ball changes momentum more slowly
b) the force applied is smaller
c) you decrease the impulse required to stop the ball
d) two of A, B, and C
e) all of A, B, and C
d) 3.2 s
e) 44 s
d) 17 m/s [up]
e) none of the above
a) 49 m
b)
5.4 m
c) 4.5 m
5. Rubbing your hands together can quickly produce 45 J of thermal energy. If it is done with an average
friction force of 8.4 N, the distance your hands have slid past each other is
d) 3.7 m
e) 1.2 m
Transcribed Image Text:1. A net force of 12 N changes the momentum of an object of a 250 g ball by 3.7 kg. m/s. The force acts for a) 0.31 s b) 0.81 s c) 1.2 s 2. A 1.5 kg bird is flying at a velocity of 18 m/s [22° above the horizontal]. The vertical component of its momentum a) 10 m/s [up] b) 6.7 kg-m/s [up] c) 25 kg m/s [up] 3. When you catch a fast-moving baseball, your hands hurts less if you move it in the direction of the ball because a) the ball changes momentum more slowly b) the force applied is smaller c) you decrease the impulse required to stop the ball d) two of A, B, and C e) all of A, B, and C d) 3.2 s e) 44 s d) 17 m/s [up] e) none of the above a) 49 m b) 5.4 m c) 4.5 m 5. Rubbing your hands together can quickly produce 45 J of thermal energy. If it is done with an average friction force of 8.4 N, the distance your hands have slid past each other is d) 3.7 m e) 1.2 m
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