A Student Has to Work the Following Problem: a Block

question 10

Multiple Choice

A student has to work the following problem: A block is being pulled along at constant speed on a horizontal surface a distance d by a rope supplying a force F at an angle of elevation q.The surface has a frictional force acting during this motion.How much work was done by friction during this motion? The student calculates the value to be -Fdsinq.How does this value compare to the correct value?

• A)It is the correct value.
• B)It is too high.
• C)It is too low.
• D)The answer cannot be found until it is known whether q is greater than,less than,or equal to 45°.

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Definitions:

Consumer Surplus

The discrepancy between what consumers are willing to spend on a good or service and their actual expenditures.

Surplus II

An excess of supply over demand in the market, leading to excess goods and potential lower prices.

Consumer Surplus

The separation between the entire amount consumers are keen and financially able to expend on a good or service, and the amount they actually expend.

Surplus I

An excess of supply over demand, leading to a situation where the quantity of a good or service exceeds the quantity demanded at the current price.