AP2 Midterm Quizizz #3 (25 Q)

The PV graph for 1 mole of an ideal gas is shown. Find the total work done in a complete cycle (A→B→C→A).

• 0 J

• 1500 J

• 6000 J

• 3000 J

The PV Graph for 1 mole of an ideal gas is shown. During which cycle must heat be added to the gas (+Q)?

• A→B

• B→C

• C→A

• none of the above

Two negative point charges are a distance 𝑥 apart

and have potential energy 𝑈. If the distance between

the point charges increases to 3𝑥, what is their new

potential energy?

• 9𝑈

• 3𝑈

• 𝑈

• 𝑈/3

• 𝑈/9

The venturi tubes shown above have three sections with different radii. Which of the following is true about the manometer readings?

• P1 = P2 = P3

• P3 > P1 > P2

• P2 > P1 > P3

• P1 > P2 > P3

A piece of wood with a volume of 50 cm3 is floating on water, and a piece of iron with a volume of 50 cm3 is totally submerged. Which has the greater buoyant force on it?

• The wood.

• The iron.

• Both have the same buoyant force.

• Cannot be determined without knowing their densities.

Answer explanation

The wood is floating and is only partially submerged. It does not displace a weight of water related to its entire volume. The iron however is totally submerged and does displace a weight of water equal to its entire volume. Since the iron displaces more water, it has a

larger buoyant force acting on it.

The pipe changes height from y₁ = 2 meters to y₂ = 3 meters. Since the areas are the same, we can say v₁ = v₂. Which of the following is true?

• P₁ = P₂ + ρg(y₂– y₁)

• P₁ = P₂

• P₁ = 0

• P₂ = 0

Answer explanation

Bernoulli's Equation, the velocities are the same so the kinetic energy terms cancel out.

The picture shows two completely identical mason jars. They're both filled with the same gas, only one of them has more in it (more molecules). What can you say about the pressures of both jars?

• P₁ > P₂ (greater pressure in jar 1)

• P₁< P₂ (greater pressure in jar 2)

• P₁ = P₂ (same pressure in both)

• There's not enough info to tell

Name the thermodynamic process

• isobaric

• isovolumetric/isochoric

• isothermal

• adiabatic

Answer explanation

The volume does not change. Isovolumetric.

Name the thermodynamic process

• isobaric

• isovolumetric/isochoric

• isothermal

• adiabatic

Answer explanation

The horizontal line means the pressure does not change. "Baric" implies pressure. Think of a barometer. ...isobaric

If three identical samples of an ideal gas are taken from initial state I to final state F along the paths IAF, IF, and IBF as shown in the pV-diagram above, which of the following must be true?

• The heat absorbed by the gas is the same for all three paths.

• The change in internal energy of the gas is the same for all three paths.

• The expansion along path IF is adiabatic.

• The expansion along path IF is isothermal.

Answer explanation

Changes in internal energy are path independent on a pV diagram as it depends on the change in temperature, which is based on the beginning and end points of the path and not the path taken