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

Explain the influence of genetics on body weight and composition.

Describe methods used to assess body fat and composition.

Recognize the health implications of various body fat distributions.

Define and explain metabolic conditions and disorders related to exercise and body composition.

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Definitions:

Monomers

Simple molecules which can join together to form polymers through chemical reactions.

Poly(Ethylene Terephthalate)

A thermoplastic polymer resin of the polyester family, used in fibers for clothing, containers for liquids and foods, and in thermoforming applications.

Hydrolyzed

The process where a compound undergoes decomposition as a result of interacting with water.

Crystallinity

The degree to which a solid material has a crystal structure, impacting its physical properties like melting point and hardness.