A Firecracker Breaks Up into Two Pieces,one of Which Has

question 70

Multiple Choice

A firecracker breaks up into two pieces,one of which has a mass of 200 g and flies off along the +x-axis with a speed of 82.0 m/s.The second piece has a mass of 300 g and flies off along the +y-axis with a speed of 45.0 m/s.What is the total momentum of the two pieces?

• A)361 kg ∙ m/s at 56.3° from the +x-axis
• B)93.5 kg ∙ m/s at 28.8° from the +x-axis
• C)21.2 kg ∙ m/s at 39.5° from the +x-axis
• D)361 kg ∙ m/s at 0.983° from the +x-axis
• E)21.2 kg ∙ m/s at 56.3° from the +x-axis

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Definitions:

Obsession

Persistent, unwanted thoughts that cause distress or anxiety.

Compulsion

Repetitive and irrational behaviors or mental acts that an individual feels driven to perform, often associated with obsessive-compulsive disorder.

Repeatedly Washing

Often associated with obsessive-compulsive disorder (OCD), this behavior involves the compulsive urge to wash one's hands or objects to alleviate distress or anxiety.

Obsessive-Compulsive Disorder

A chronic and long-lasting disorder in which a person has uncontrollable, reoccurring thoughts (obsessions) and behaviors (compulsions) that he or she feels the urge to repeat over and over.