A 20-Kg Mass Is Attached to One End of a Spring

question 49

Multiple Choice

A 2.0-kg mass is attached to one end of a spring with a spring constant of 100 N/m and a 4.0-kg mass is attached to the other end. The masses are placed on a horizontal frictionless surface and the spring is compressed 10 cm. The spring is then released with the masses at rest and the masses oscillate. When the spring has its equilibrium length for the first time the 2.0-kg mass has a speed of 0.36 m/s. The mechanical energy that has been lost to this instant is:

• A) zero
• B) 0.31 J
• C) 0.61 J
• D) 0.81 J
• E) 1.2 J

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Definitions:

Obsessions

Persistent, unwanted thoughts, images, or urges that cause distress or anxiety.

Olfactory Inhibition

The decrease in the ability to perceive odors, which can occur temporarily due to factors such as nasal congestion or more permanently from certain neurological conditions.

Delusion

A false belief firmly held despite clear evidence to the contrary, often a symptom of psychiatric disorders such as schizophrenia.

Hallucination

A perceptual experience during wakefulness without external stimuli, often involving sight or sound that seems real but is not.