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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 d) 3.2 s e) 44 s

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
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
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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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