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:

Oceanic Crust

The part of the Earth's crust that underlies the ocean basins, composed mostly of basalt and thinner than continental crust.

Continental Crust

The relatively thick part of the earth's crust that forms the large landmasses. It is generally older and more complex than oceanic crust.

Thumbs-up

A hand gesture used to express approval, satisfaction, or that everything is okay, often also used in digital communications to signify agreement.

Cultures

The collective norms, values, beliefs, and practices of a group of people, which shape their behavior and perspectives.