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Quantifying Work02:30

Quantifying Work

As a system undergoes a change, its internal energy can change, and energy can be transferred from the system to the surroundings, or from the surroundings to the system. 
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Elastic Potential Energy in Sports01:20

Elastic Potential Energy in Sports

Elastic Potential Energy in SportElastic potential energy is stored in objects that can be stretched or compressed. In sports, this type of energy plays a key role in performance, whether it's the stretch of a pole in pole vaulting, the compression of a springboard in diving, or the flexing of a tennis racket during a serve. When the object returns to its original shape, the stored energy is released, helping to launch, lift, or move the athlete or object.Elastic potential energy depends on two...
Relative Frequency Distribution00:55

Relative Frequency Distribution

A relative frequency distribution is the proportion or fraction of times a value occurs in a data set. To find the relative frequencies, one can divide each frequency by the total number of data points in the sample. It is very similar to a regular frequency distribution, except that instead of reporting how many data values fall in a class, a relative frequency distribution reports the fraction of data values that fall in a class. These fractions or proportions are called relative frequencies...
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Weighted Mean00:57

Weighted Mean

While taking the arithmetic, geometric, or harmonic mean of a sample data set, equal importance is assigned to all the data points. However, all the values may not always be equally important in some data sets. An intrinsic bias might make it more important to give more weightage to specific values over others.
For example, consider the number of goals scored in the matches of a tournament. While computing the average number of goals scored in the tournament, it may be more important to...
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