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midterm physics 2
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refers to gases and liquids
In an airplane wing, air at the bottom must travel farther, so it moves faster, and the pressure there is lower, creating lift.
The freezing point of a solution, such as salt water, is lower than the freezing point for the solvent by itself.
Which of the following is NOT a unit of heat?
Oil, for example, flows more easily than molasses. This is because molasses has a higher viscosity, which is a measure of resistance to fluid flow.
You squeeze a tube of toothpaste. The pressure of the toothpaste does not just go up at the place where you are squeezing it. It goes up by the same amount everywhere in the tube. This is an application of
Example of Thermal Expansion
cold fluid rises
A wood-burning fireplace has a chimney which allows the heated air to rise and escape the house. How then does a fireplace then heat the room?
all of the above
simply mass per unit volume
The second law of thermodynamics has a lot to do with
internal energy being constant
conservation of energy
Which of the following is true about the x component of a projectile?
the acceleration along x varies
distance the object travels is not dependent on time
velocity is constant
Which of the following is a unit of pressure
The lower the pressure on a liquid, the easier it is to make it boil
lower up the mountains than at sea level
Pressure Depends on
At what temperature reading are the Fahrenheit and Celsius scale the same?
Which process shows an increase in entropy?
When a material is hot, it has more thermal energy than when it is cold.
Ice is more dense that water since it is a solid
Steel can float if shaped like a boat, because in that shape it can displace as much water as its own weight.
2 atmospheres is equal to
760 mm Hg
76 cm Hg
A physical quantity that is proportional to the average kinetic energy of translation of particles in matter.
People need seatbelts to prevent injuries from the tendency of the body to surge forward because of collisions. This tendency follows the __ of motion
Hot fluids rise and cool fluids sink in
Why do swimmers float better in the ocean than in a lake?
because there is more salt in the lake than in the ocean
because the body is twice as dense as water
because ocean water is pure H2O
because ocean water is denser than lake water
force per unit area
The absolute temperature scale is
Two guys have different masses. The guy with a bigger mass has greater weight than the guy with smaller mass in the presence of a gravitational field. This is an application of the __ law
Strong, naturally occurring winds can damage structures through
weakening intermolecular bonds
difference in air pressure inside and outside the structure
decreasing the gravitational field
increasing the gravitational field
A submarine is submerged in water, while a blimp is submerged in air. In each a pascal force must balance the weight of the vessel.
It takes longer to cook food in boiling water at high altitudes
because the boiling water isn’t as hot
because the higher the pressure on a liquid, the easier it is to make it boil
because the temperature change causes chemical changes in food
because the weather at high altitudes changes quickly
Adhesion is the clinging together of molecules/atoms of two different substances
The only force acting on a projectile is
An incompressible fluid, like water, flowing through a pipe will speed up if the pipe gets wider
how can some insects walk on water?
The specific heat of water and aluminum is 4.186 and 0.900 kj/kg C. An 800 g aluminum teakettle contains 2.00 kg of water at 15.0 C. How much heat is required to raise the temperature of the water (and kettle) to the boiling point of pure water?
states that any object that is partially or completely submerged in a fluid is buoyed up a force equal to the weight of the fluid that the object displaces
Newton's second law of motion has to something to do with
. inertia . inertia inertia inertia
action and reaction
the faster a fluid is moving the less pressure it exerts.
Enthalpy is a measure of randomness or disorder in a system.
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