Answers Crowley Credit Recovery Physics ASecond Law of Thermodynamics

Second Law of Thermodynamics — Cumulative exam Answers

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It is a mathematical way of showing accuracy.

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The higher the percent error, the more accurate the data set.

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The higher the percent error, the less accurate the data set.

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Only the experimental value is needed to calculate percent error.

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Only the actual, or accepted, value is needed to calculate percent error.

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A percent error always has a positive value.

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highly corrosive but not highly flammable

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highly reactive and corrosive

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highly flammable but not highly corrosive

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not highly reactive or corrosive

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The free-body diagram of a crate is shown.

352 N to the left

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176 N to the left

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528 N to the right

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440 N to the right

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The electron cloud model is a modern theory about the structure of atoms that explains many of the atom’s behaviors. According to the model, scientists imagine an atom to have a large nucleus of matter in the center surrounded by tiny particles called electrons. These electrons fly so fast and unpredictably around the nucleus that just one electron can appear to be a cloud. However, individual electrons are far too small for a human to see or touch.

The theory describes electrons in experiments, but it cannot be used to describe all electrons.

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The theory provides an image that humans can visualize, but it does not fully represent how electrons exist.

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The theory is a proven fact about nature, but because it is already proven it does not inspire further scientific study of electrons.

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The theory explains several observations, but because they are observations made in the past the theory cannot predict what will happen in the future.

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Which describes the movement of a fluid during convection?

Warm and cool fluids rise.

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Warm and cool fluids sink.

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Warm fluid rises and cool fluid sinks.

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Warm fluid sinks and cool fluid rises.

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Which energy transformation occurs after a skydiver reaches terminal velocity?

Gravitational potential energy transforms into thermal energy.

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Gravitational potential energy transforms into kinetic energy.

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Kinetic energy transforms into thermal energy.

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Kinetic energy transforms into gravitational potential energy.

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What is the vertical acceleration of a dart that is launched horizontally with an initial velocity of 2.3 m/s?

–9.8 m/s2

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0 m/s2

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2.3 m/s2

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9.8 m/s2

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conclusions

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data

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research

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supplies

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What is the formula for calculating kinetic energy?

KE = mv2

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KE = 2mv2

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KE = m2v

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KE = 2m2v

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The MSDS for glacial acetic acid says that it is a flammable liquid that can severely burn any human tissue it comes in contact with. It reacts with bases, various metals, and strong oxidizing agents. Its vapors can form explosive mixtures with air. Based on this information, which statement is applicable to glacial acetic acid?

It should be heated to remove moisture and stored on a lab shelf.

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It should be handled on a clean, dry area of the lab bench.

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It should be stored in an iron container, away from open flames.

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It should be handled in a fume hood, away from open flames.

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Two scientists are cutting samples of leaves for analysis. One scientist always clips a sample from the base of the leaf near the stem, and the other scientist always clips a sample from the tip of the leaf. This illustrates a

procedural error.

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calibration error.

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measurement error.

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unit error.

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According to the first law of thermodynamics, what could happen when heat is added to a system?

The internal energy of the system decreases.

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The heat is turned into work done by the system.

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New energy is created within the system.

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Some of the energy in the system is destroyed.

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speed

velocity

position

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The temperature of the gas will not increase during the compression stage.

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Burned gases will not be released into the surrounding air.

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The fuel-air mixture will not be able to enter the cylinder.

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Combustion and subsequent gas expansion will not occur.

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a computer and pH paper

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pH paper and a graphing calculator

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a computer and a concentration probe

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a graphing calculator and a concentration probe

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A substance has a specific heat of 0.870 J/g°C. It requires 2,000.0 joules to increase the temperature of 10.0 grams of the substance from its original temperature to its final temperature.

87.0°C

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174°C

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230°C

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1,740°C

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Two objects are interacting, but stay stationary. Which best describes what is happening to the action and reaction forces?

There are no forces acting on the objects.

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The forces are equal and opposite each other.

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One object is exerting more force than the other.

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Their forces are occurring at different times.

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The gravitational force between two asteroids is 6.2 × 108 N. Asteroid Y has three times the mass of asteroid Z.

3.7 × 1015 kg

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1.1 × 1016 kg

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1.4 × 1031 kg

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4.1 × 1031 kg

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Motion maps for two objects, Y and Z, are shown.At which time does Object Y pass Object Z?

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Sixty-three joules of heat are added to a closed system. The initial internal energy of the system is 58 J, and the final internal energy is 93 J.

28 J

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30 J

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88 J

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151 J

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