midterm physics 2

Enthalpy is a measure of randomness or disorder in a system.

the faster a fluid is moving the less pressure it exerts.

Newton's second law of motion has to something to do with

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

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?

how can some insects walk on water?

An incompressible fluid, like water, flowing through a pipe will speed up if the pipe gets wider

The only force acting on a projectile is

Adhesion is the clinging together of molecules/atoms of two different substances

It takes longer to cook food in boiling water at high altitudes

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.

Strong, naturally occurring winds can damage structures through

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

The absolute temperature scale is

force per unit area

Why do swimmers float better in the ocean than in a lake?

Hot fluids rise and cool fluids sink in

People need seatbelts to prevent injuries from the tendency of the body to surge forward because of collisions. This tendency follows the __ of motion

A physical quantity that is proportional to the average kinetic energy of translation of particles in matter.

2 atmospheres is equal to

Steel can float if shaped like a boat, because in that shape it can displace as much water as its own weight.

Ice is more dense that water since it is a solid

When a material is hot, it has more thermal energy than when it is cold.

Which process shows an increase in entropy?

At what temperature reading are the Fahrenheit and Celsius scale the same?

Pressure Depends on

lower up the mountains than at sea level

The lower the pressure on a liquid, the easier it is to make it boil

Which of the following is a unit of pressure

Which of the following is true about the x component of a projectile?

The second law of thermodynamics has a lot to do with

simply mass per unit volume

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?

Example of Thermal Expansion

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

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.

Which of the following is NOT a unit of heat?

The freezing point of a solution, such as salt water, is lower than the freezing point for the solvent by itself.

In an airplane wing, air at the bottom must travel farther, so it moves faster, and the pressure there is lower, creating lift.

refers to gases and liquids