A Girl Is Using a Rope to Pull a Box

question 56

Multiple Choice

A girl is using a rope to pull a box that weighs 350 N across a level surface with constant velocity.The rope makes an angle of 30° above the horizontal,and the tension in the rope is 100 N.What is the normal force of the floor on the box?

• A) 400 N
• B) 250 N
• C) 450 N
• D) 300 N
• E) ​263 N

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Definitions:

Independent Samples

Samples drawn from two populations in such a way that the selection of a sample from one population does not influence the selection of a sample from the other population.

Standard Error

A statistical measure that estimates the accuracy of a sample mean by describing the dispersion of sample means around the population mean.

Sample Mean Difference

The difference between the mean values of two samples drawn from the same or different populations.

Population Means

The average value of a particular characteristic in the entire population.