Examples of directly proportional in the following topics:
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- When two variables change proportionally, or are directly proportional, to each other, they are said to be in direct variation.
- This can also be called directly proportional.
- Thus we can say that cost varies directly as the value of toothbrushes.
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- The electrical current is directly proportional to the voltage applied and inversely related to the resistance in a circuit.
- According to Ohm's law, The electrical current I, or movement of charge, that flows through most substances is directly proportional to the voltage V applied to it.
- Resistance is inversely proportional to current.
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- Henry's law states that the amount of a gas that dissolves in a liquid is directly proportional to the partial pressure of that gas.
- Henry's law states that at a constant temperature, the amount of a gas that dissolves in a liquid is directly proportional to the partial pressure of that gas in equilibrium with that liquid.
- The practical description for the law is that the solubility (i.e., equilibrium) of a gas in a liquid is directly proportional to the partial pressure of that gas.
- The amount of oxygen that dissolves into the bloodstream is directly proportional to the partial pressure of oxygen in alveolar air.
- Henry's law states that when a gas is in contact with the surface of a liquid, the amount of the gas which will go into solution is proportional to the partial pressure of that gas.
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- Hooke's law of elasticity is an approximation that states that the extension of a spring is directly proportional to the load applied to it.
- It states: the extension of a spring is in direct proportion with the load applied to it .
- In simple terms, Hooke's law says that stress is directly proportional to strain.
- The extension of the spring is linearly proportional to the force.
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- Charles' and Gay-Lussac's Law states that at constant pressure, temperature and volume are directly proportional.
- This law states that at constant pressure, the volume of a given mass of an ideal gas increases or decreases by the same factor as its temperature (in Kelvin); in other words, temperature and volume are directly proportional.
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- The two variables may be
considered directly proportional.
- Thus we can say that the cost varies directly as the value of toothbrushes.
- For example, if $x$ and $y$ are inversely proportional, if $x$ is
doubled, then $y$ is halved.
- As an example, the time taken for a journey is inversely proportional to the speed of travel.
- An inversely proportional relationship between two variables is represented graphically by a hyperbola.
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- Boyle's law states that pressure P and volume V of a given mass of confined gas are inversely proportional:
- while Charles' law states that volume of a gas is proportional to the absolute temperature T of the gas at constant pressure
- where C is a constant which is directly proportional to the amount of gas, n (representing the number of moles).
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- The two variables may be considered directly proportional.
- For example, if x and y are inversely proportional, if x is doubled, then y is halved.
- In this example, z varies directly as x and inversely as y.
- In the above equation, P varies directly with n and T, and inversely with V.
- A constant amount of gas will exert pressure that varies directly with temperature.
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- How do you know you are dealing with a proportion problem?
- p' = the estimated proportion of successes (p' is a point estimate for p, the true proportion)
- In the error bound formula, the sample proportions p' and q' are estimates of the unknown population proportions p and q.
- The estimated proportions p' and q' are used because p and q are not known. p' and q' are calculated from the data. p' is the estimated proportion of successes. q' is the estimated proportion of failures.
- p' = 0.842 is the sample proportion; this is the point estimate of the population proportion.
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