A Student Has to Work the Following Problem: a Block $\degree$

question 73

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 \(\degree\).

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Definitions:

Tincture

A solution where a solute is dissolved into alcohol, used primarily in medicine or herbalism.

Bid

An offer made by an individual or company to buy a good or service, or to perform a job at a specified price.

Tid

An abbreviation for "ter in die," which is Latin for "three times a day"; commonly used in medical prescriptions to indicate dosing frequency.

Prn

An abbreviation for the Latin phrase "pro re nata," meaning "as the situation demands," often used in medical prescriptions to indicate taking medicine as required.