One boy lifts 50 pounds of weights, and a second boy lifts 70 pounds of weights....
One boy lifts 50 pounds of weights, and a second boy lifts 70 pounds of weights. Someone says that the boy who lifts 70 pounds is more powerful. Why might this not be the case? Please explain.
Homework Answers
We know that power = Work / Time. In terms of physics it does not mean that the boy who lift 70 pounds of weight is more powerful.
For example
Let us consider both raised weight up to a height of h. Then workdone = mgh.
The boy who lift more mass will do more work but suppose he takes more time to lift it up than the boy who lift smaller mass , then mathematically we can calculate power using given data and conclude that the boy who lift more weight has less power and hence he is less powerful.
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One boy lifts 50 pounds of weights, and a second boy lifts 70
pounds of weights....
187 twins are involved in a study. The pairs each had one boy and girl. Hospital...
187 twins are involved in a study. The pairs each had one boy and
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The difference in weights was calculated by subtracting the girl
weight in oz from the boy weight in oz
d= Xm - Xf
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The difference in weights was calculated by subtracting the girl
weight in oz from the boy weight in oz
d= Xm - Xf
After studying 187 sets of twins, the study finds the 99%
confidence interval for the mean difference of weights in oz
is:
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