weight

(noun)

The force on an object due to the gravitational attraction between it and the Earth (or whatever astronomical object it is primarily influenced by).

Related Terms

  • point mass
  • gravitational force

Examples of weight in the following topics:

  • Statistical Literacy

    • Research on the effectiveness of surgery for weight loss reported here (http://www.medpagetoday.com/Endocrinology/Obesity/34820) found that "The surgery was associated with significantly greater weight loss [than the control group who dieted] through 2 years (61.3 versus 11.2 pounds, p<0.001). "
    • For each subject a difference score between their initial weight and final weight could be computed.
    • The mean difference score will equal the difference between the mean weight losses of the two groups (61.3 - 11.2 = 50.1).
  • Weight

    • In physics, it is important to differentiate the weight of an object from its mass.
    • On the other hand, the weight of an object is an extrinsic quantity.
    • In US customary units, the weight of an object can be expressed in pounds.
    • In this case, the weight of the object varies due to the force of buoyancy.
    • A spring scale measures weight by finding the extent to which a spring is compressed.This is proportional to the force that a mass exerts on the scale due to its weight.
  • Introduction to multiple regression exercises

    • Here, we study the relationship between smoking and weight of the baby.
    • Exercise 8.1 introduces a data set on birth weight of babies.
    • 8.3: (a) baby weight = −80.41 + 0.44 × gestation − 3.33 × parity − 0.01 × age + 1.15 × height + 0.05 × weight − 8.40 × smoke.
    • (d) baby weight = 120.58. e = 120 − 120.58 = −0.58.
    • The model over-predicts this baby's birth weight.
  • The Weightings

    • The weightings used in the WACC are ratios of the market values of various forms of debt and equity used in a company's financing.
    • To calculate the weighted average cost of capital (WACC) we must take into account the weight of each component of a company's capital structure.
    • The "weighting" varies based on how the company finances its activities.
    • If the value of the company's equity exceeds its debt, the cost of its equity will have more weight.
    • Define how a company's weighted average cost of capital is weighted
  • Writing Formulas for Polymeric Macromolecules

    • HDPE is composed of macromolecules in which n ranges from 10,000 to 100,000 (molecular weight 2*105 to 3 *106 ).
    • Because of this, polymer molecular weights are usually given as averages.
    • Two experimentally determined values are common: Mn , the number average molecular weight, is calculated from the mole fraction distribution of different sized molecules in a sample, and Mw , the weight average molecular weight, is calculated from the weight fraction distribution of different sized molecules.
    • Since larger molecules in a sample weigh more than smaller molecules, the weight average Mw is necessarily skewed to higher values, and is always greater than Mn.
    • As the weight dispersion of molecules in a sample narrows, Mw approaches Mn, and in the unlikely case that all the polymer molecules have identical weights (a pure mono-disperse sample), the ratio Mw / Mn becomes unity.
  • Mass

    • At its 2011 meeting, the General Conference on Weights and Measures (CGPM) agreed that the kilogram should be redefined in terms of the Planck constant.
    • In everyday usage, the mass of an object in kilograms is often referred to as its weight.
    • In scientific terms, 'weight' refers to the gravitational force acting on a given body.
    • For example, a person's weight on the Earth is different than a person's weight on the moon because of the differences in the gravitational pull of each body.
    • Accordingly, astronauts in microgravity must exert 10 times more force to accelerate a 10-kg object at the same rate as a 1-kg object, even though the differences in weight are imperceptible.
  • Weighted Average Cost of Capital

    • The WACC is the cost of capital taking into account the weights of each component of a company's capital structure.
    • The weighted average cost of capital (WACC) is the rate a company is expected to pay, on average, to its security holders.
    • Stated differently, the return on capital of a new project must be greater than the weighted average cost of capital.
    • Since companies raise money using any number and combination of these sources - i.e. debt, common stock, preferred stock, retained earnings - it is important to calculate the cost of capital taking into account the relative weights of each component of a company's capital structure.
  • Log Transformations

    • Both graphs plot the brain weight of animals as a function of their body weight.
    • The raw weights are shown in the upper panel; the log-transformed weights are plotted in the lower panel.
    • Scatter plots of brain weight as a function of body weight in terms of both raw data (upper panel) and log-transformed data (lower panel).
  • Portfolio Diversification and Weighting

    • Weighting is the percent allocation a particular investment type receives within a portfolio.
    • The idea of eliminating risk by spreading investments across pools of underlying stocks and bonds is called "diversification. " A diversified portfolio spreads investments across all asset classes with a weighting system that takes time frame and risk tolerance into account.
    • The "weight" is the proportion of that portfolio assigned to one category.
  • Sensory Difference Thresholds

    • For example, consider holding a five-pound weight (the reference level), and then having a one pound weight added.
    • This increase in weight is significant in comparison to the reference level (a 20% increase in weight).
    • However, if you hold a fifty pound weight (the new reference level), you would not be likely to notice a difference if one pound is added.
    • This is because the difference in the amount of additional weight from the reference level is not significantly greater (2% increase in weight) than the reference level.
    • This is similar to adding only one pound of weight when you're holding 50 pounds.
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