A crate is being pulled down an incline as shown in the figure. With respect to the crate's direction of motion, which of the fo
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Answer:
<em>a) P(21)=40</em>
<em>b) P max = 60</em>
<em>c) P min = 20</em>
Explanation:
<u>Function Modeling</u>
The blood pressure P is modeled with the equation
Where t is in seconds.
a) We'll find the pressure when t=21 seconds
b) The maximum value will occur when the sine function has a value of 1
c) The minimum pressure will occur when the sine function is at minimum (-1)
Answer: A) Forces of attraction and repulsion exist between gas particles at close range.
Explanation:
The <u>Ideal Gas equation</u> is:
Where:
is the pressure of the gas
is the volume of the gas
the number of moles of gas
is the gas constant
is the absolute temperature of the gas in Kelvin
According to this law, molecules in gaseous state do not exert any force among them (attraction or repulsion) and the volume of these molecules is small, therefore negligible in comparison with the volume of the container that contains them. In this sense, real gases can behave approximately to an ideal gas, under conditions of high temperature and low pressures.
However, at low temperatures or high pressures, real gases deviate significantly from ideal gas behavior. This is because at low temperatures molecules begin to move slower, allowing the repulsive and attractive forces among them to take effect. In fact, <u>the attraction forces are responsible for the condensation of the gas</u>. In addition, at high pressures the volume of molecules cannot be approximated to zero, hence the volume of these molecules is not negligible anymore.