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Basic physics oral study guide
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Flashcards
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Terms in this set (18)
What is meant by matter?
Anything that occupies space and has weight
What are the three basic physical states in which matter can exist?
Solid, Liquid, Gas
what is meant by pressure?
force that acts on a unit of area
what is the standard sea level atmospheric pressure expressed in inches of mercury, and in pounds per square inches?
29.92 in of mercury and 14.92 pounds per square inch.
what characteristics of the atmosphere determines the speed of sound?
Its temperature
what is meant by the density of air?
The weight of a given volume of air.
How much force is produced by 1,000 psi of hydraulic pressure acting on a piston with an area of 20 square inches?
20,000 lbs
what is meant by the fulcrum of a lever?
The point about which the lever rotates.
give an example of a first-class lever, a second-class lever, and a third class lever.
First class - a screwdriver being used to pry the lid from a can of paint.
Second class - a wheelbarrow
Third class - a hydraulically retracted landing gear.
How many cubic inches of fluid is forced out of a cylinder by a piston with an area of 20 square inches, when the piston moves five inches?
100 cubic inches
what is meant by a temperature of absolute zero?
The temperature at which all molecular movement stops.
What is the Celsius equivalent of a temperature of 50°F?
10 degrees Celsius
Farenhight - 30 = answer / 2
50 - 30 = 20/2 = 10
What formula is used to find the amount of work done when an object is moved across a floor?
work = force x distance
what determines the mechanical advantage of an arrangement of ropes and pulleys?
The number of ropes that support the weight.
what determines the mechanical advantage of a gear train?
the ratio between the number of teeth on the drive gear and the number of teeth on the driven gear.
What will happen to the pressure of a confined gas if the temperature of the gas is increased?
the pressure will increased.
what are three methods of heat transfer?
conduction, convention, and radiation
what is meant by the absolute humidity of the atmosphere?
the actual amount of water that is in a given volume of air.
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Verified questions
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When one race car passes another during a race, the passing car usually tries to pass on the inner lane of a curve in the track. Why?
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Consider again the steady, two-dimensional velocity field of previous problem. Obtain expressions for the particle coordinates, $x_p=f_1(t)$ and $y_p=f_2(t)$, as functions of time and the initial particle position, $\left(x_0+y_0\right)$ at $t=0$. Determine the time required for a particle to travel from initial position, $\left(x_0, y_0\right)=\left(\frac{1}{2}, 2\right)$ to positions $(x, y)=(1,1)$ and $\left(2, \frac{1}{2}\right)$. Compare the particle accelerations determined by differentiating $f_1(t)$ and $f_2(t)$ with those obtained in previous problem.
physics
A small bar magnet is suspended in a uniform $0.250-\mathrm{T}$ magnetic field. The maximum torque experienced by the bar magnet is $4.60 \times 10^{-3} \mathrm{~N} \cdot \mathrm{m}$. Calculate the magnetic moment of the bar magnet.
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