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:

Fatigued

The state of being extremely tired, exhausted, or weary from physical or mental exertion.

Standards

These are established norms or requirements. In a rephrased form: Standards refer to the agreed-upon criteria or benchmarks used to measure the quality or performance of products, services, or processes.

Internal Validity

The extent to which the design and conduct of a study allow for accurate attribution of outcomes to the intervention or treatment, rather than to confounding variables.

Nonequivalent Control Group Design

A quasi-experimental research design where the experimental group and control group may not be strictly comparable at the outset of the experiment, lacking random assignment.