An Empty Railroad Car Traveling at a Constant Speed Strikes

question 37

Multiple Choice

An empty railroad car traveling at a constant speed strikes a second car at rest.The second car,being full with passengers,has twice the mass of the first car.If the cars lock together as a result of the collision,the ratio of the initial to the final kinetic energies of the system is

• A)1.
• B)1/3.
• C)3.
• D)1/9.
• E)9.

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Definitions:

Fear Hierarchy

A ranked list of fears or phobias, typically used in exposure therapy, starting from least to most frightening scenarios for an individual.

Relaxation

The state of being free from tension and anxiety, often achieved through practices like meditation, deep breathing, or leisure activities.

Counterconditioning

A behavior therapy technique involving the conditioning of a desired response that is incompatible with an unwanted behavior.

Systematic Desensitization

A therapy technique used to reduce phobic responses and anxiety by gradual exposure to the feared object or situation while using relaxation methods.