Suppose You See a Spaceship with a Clock on It

question 111

Multiple Choice

Suppose you see a spaceship with a clock on it hurtling past you at 80% of the speed of light.As it goes by,the second hand on the ship's clock ticks off five seconds.How much time elapsed on your clock during this occurrence?

• A) more than 5 seconds if the spaceship is approaching you and less than 5 seconds if it is moving away from you
• B) less than 5 seconds
• C) more than 5 seconds
• D) 5 seconds-the same as on the ship's clock

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Definitions:

Law of Diminishing Returns

An economic principle stating that as investment in a particular area increases, the rate of profit from that investment, after a certain point, cannot continue to increase if other variables remain constant.

Extra Output

The additional production that is generated as a result of adding more of a variable input, such as labor or capital.

Diminishing Returns

A principle stating that as additional amounts of a variable input are added to a fixed input, beyond some point the marginal product of the variable input begins to decrease.

Unit of Labor

A measure of labor input, often represented by one worker or one hour of work, used to calculate productivity or costs.