Test 6 (15-16)

What is another name for wave velocity? a compression velocity b propagation velocity c rarefaction velocity

b propagation velocity

If you are on a boat in the trough of a wave on the ocean, and the wave amplitude is 1m , what is the wave height from your position? a 1m b 2m c 4m d 8m

2m

If Q is 120J and T is 350K , what is the change in entropy? a 0.343J/K b 1.51J/K c 2.92J/K d 34.3J/K

a 0.343J/K

What is the change in internal energy for a cyclic process? a 0J b 5J c 10J

a 0J

As you pass a tractor-trailer truck on a highway, you notice that its trailer is slowly bouncing up and down on its springs. Is it more likely that the trailer is heavily loaded or nearly empty? a heavily loaded b nearly empty

a heavily loaded

In a longitudinal sound wave, after a compression wave moves through a region, the density of molecules briefly decreases. Why is this? a After a compression wave, some molecules move forward temporarily. b After a compression wave, some molecules move backward temporarily. c After a compression wave, some molecules move upward temporarily. d After a compression wave, some molecules move downward temporarily.

a After a compression wave, some molecules move forward temporarily.

Consider the example of tossing a ball when there's air resistance. As air resistance increases, what would you expect to happen to the final velocity and final kinetic energy of the ball? Why? a Both will decrease. Energy is transferred to the air by heat due to air resistance. b Both will increase. Energy is transferred from the air to the ball due to air resistance. c Final velocity will increase, but final kinetic energy will decrease. Energy is transferred by heat to the air from the ball through air resistance. d Final velocity will decrease, but final kinetic energy will increase. Energy is transferred by heat from the air to the ball through air resistance.

a Both will decrease. Energy is transferred to the air by heat due to air resistance.

What is the principle of conservation of energy? a Energy cannot be created or destroyed, but can be altered from one form to another. b Energy can be created or destroyed, and can also be altered from one form to another. c Energy cannot be created or destroyed, but can be converted into the mass of the body. d Energy can be created or destroyed, but cannot be converted into the mass of the body.

a Energy cannot be created or destroyed, but can be altered from one form to another.

What happens during constructive interference on a standing wave? a In a constructive interference, only the resonant frequencies interfere constructively to form standing waves. b In a constructive interference, only the resonant frequencies interfere destructively to form standing waves. c In a constructive interference, frequencies other than resonant frequencies interfere destructively to form standing waves. d In a constructive interference, frequencies other than resonant frequencies interfere constructively to form standing waves.

a In a constructive interference, only the resonant frequencies interfere constructively to form standing waves.

If the amplitude of the displacement of a spring were larger, how would this affect the graph of displacement over time? What would happen to the graph if the period was longer? a Larger amplitude would result in taller peaks and troughs and a longer period would result in greater separation in time between peaks. b Larger amplitude would result in smaller peaks and troughs and a longer period would result in greater distance between peaks. c Larger amplitude would result in taller peaks and troughs and a longer period would result in shorter distance between peaks. d Larger amplitude would result in smaller peaks and troughs and a longer period would result in shorter distance between peaks.

a Larger amplitude would result in taller peaks and troughs and a longer period would result in greater separation in time between peaks.

How are standing waves formed? a Standing waves are formed by the superposition of two or more waves moving in opposite directions. b Standing waves are formed by the superposition of two or more waves moving in the same direction. c Standing waves are formed by the superposition of two or more waves moving in perpendicular directions. d Standing waves are formed by the superposition of two or more waves moving in any arbitrary directions.

a Standing waves are formed by the superposition of two or more waves moving in opposite directions.

A laser with 5 W of power is shined on a 0.01 m2 area for 3 s. How much energy is transferred to the site? What is the laser's intensity at the site? a The laser transfers 300 J of energy at an intensity of 15 W/m2. b The laser transfers 15 J of energy at an intensity of 500 W/m2. c The laser transfers 0.03 J of energy at an intensity of 0.002 W/m2. d The laser transfers 0.15 J of energy at an intensity of 0.05 W/m2

a The laser transfers 300 J of energy at an intensity of 15 W/m2.

What is resonance? When can you say that the system is resonating? a The phenomenon of driving a system with a frequency equal to its natural frequency is called resonance, and a system being driven at its natural frequency is said to resonate. b The phenomenon of driving a system with a frequency higher than its natural frequency is called resonance, and a system being driven at its natural frequency does not resonate. c The phenomenon of driving a system with a frequency equal to its natural frequency is called resonance, and a system being driven at its natural frequency does not resonate. d The phenomenon of driving a system with a frequency higher than its natural frequency is called resonance, and a system being driven at its natural frequency is said to resonate.

a The phenomenon of driving a system with a frequency equal to its natural frequency is called resonance, and a system being driven at its natural frequency is said to resonate.

two simple harmonic oscillators are constructed by attaching similar objects to two different springs. The force constant of the spring on the left is 5N/m and that of the spring on the right is 4N/m . If the same force is applied to both, which of the following statements is true? a The spring on the left will oscillate faster than spring on the right. b The spring on the right will oscillate faster than the spring on the left. c Both the springs will oscillate at the same rate. d The rate of oscillation is independent of the force constant

a The spring on the left will oscillate faster than spring on the right.

True or False: Increasing the period of an oscillator increases the frequency of its oscillation. a True b False

a True

When does a yo-yo go the maximum distance away from your finger? Why? a When the frequency of oscillation of the yo-yo from the finger is equal to its natural frequency, it shows the maximum amplitude. b When the frequency of oscillation of the yo-yo from the finger is higher than its natural frequency, it shows the maximum amplitude. c When the frequency of oscillation of the yo-yo from the finger is lower than its natural frequency, it shows the maximum amplitude. d When the frequency of oscillation of the yo-yo from the finger is double its natural frequency, it shows the maximum amplitude.

a When the frequency of oscillation of the yo-yo from the finger is equal to its natural frequency, it shows the maximum amplitude.

An engineer is planning to build a new wing for a hospital. His team is currently figuring out the best type of doors to use in the corridors. If you were on the team, what would you recommend? a doors with overdamped hydraulic springs b doors with critically damped hydraulic springs c doors with underdamped hydraulic springs d undamped door

a doors with overdamped hydraulic springs

Pendulum clocks are made to run at the correct rate by adjusting the pendulum's length. Suppose you take a pendulum clock from one city to another where the acceleration due to gravity is slightly greater. Will you have to lengthen or shorten the pendulum in the clock to keep the correct time? a lengthen b shorten

a lengthen

The suspension systems in cars contain springs. If a mechanic replaces a car's springs with stiffer springs, will the car bounce more often or less often than originally? a more often b less often

a more often

Based on what you know about heat transfer and the first law of thermodynamics, do you need to eat more or less to maintain a constant weight in colder weather? Explain why. a more: as more energy is lost by the body in colder weather, the need to eat increases so as to maintain a constant weight b more: eating more food means accumulating more fat, which will insulate the body from colder weather and will reduce the energy loss c less: as less energy is lost by the body in colder weather, the need to eat decreases so as to maintain a constant weight d less: eating less food means accumulating less fat, so that less energy will be required to burn the fat and, as a result, weight will remain constan

a more: as more energy is lost by the body in colder weather, the need to eat increases so as to maintain a constant weight

What would be an example of something a thermodynamics engineer would do in the aeronautics industry? a test the fuel efficiency of a jet engine b test the functioning of landing gear c test the functioning of a lift control device d test the autopilot functions

a test the fuel efficiency of a jet engine

When is pressure-volume work said to be done ON a system? a when there is an increase in both volume and internal pressure b when there is a decrease in both volume and internal pressure c when there is a decrease in volume and an increase in internal pressure d when there is an increase in volume and a decrease in internal pressure

a when there is an increase in both volume and internal pressure

The internal energy of a system increases by 2J , and a net amount of 3J of heat leave the system. How much net work is done by the system? a −5J b −1J c 1J d 5J

a −5J

The woman in the figure creates two waves every second by shaking the slinky up and down. (a)What is the period of each wave? (b) If each wave travels 0.9meters after one complete wave cycle, what is the velocity of wave propagation? a (a) The period of each wave is 2s ; and (b) the velocity of wave propagation 1.8m/s . b (a) The period of each wave is 0.5s ; and (b) the velocity of wave propagation is 1.8m/s . c (a) The period of each wave is 0.5s ; and (b) the velocity of wave propagation is 0.45m/s . d (a) The period of each wave is 2s ; and (b) the velocity of wave propagation is 0.45m/s .

b (a) The period of each wave is 0.5s ; and (b) the velocity of wave propagation is 1.8m/s .

Part of this gravitational energy goes into the spring. Calculate the energy stored in the spring by this stretch, and compare it with the gravitational potential energy. Explain where the rest of the energy might go. a 0.600 J b 0.300 J c 0.003 J d 0.900 J

b 0.300 J

An air conditioner has a coefficient of performance of 2. How much work input does it need to transfer 2J of heat? a 1/4J b 1J c 2J d 4J

b 1J

What is a heat engine? a A heat engine converts mechanical energy into thermal energy. b A heat engine converts thermal energy into mechanical energy. c A heat engine converts thermal energy into electrical energy. d A heat engine converts electrical energy into thermal energy.

b A heat engine converts thermal energy into mechanical energy.

Using the stopwatch, estimate the time it takes for spring 3 to stop oscillating when you hang a 100 g mass on it. The spring should begin at its equilibrium position. Watch where the spring intersects the dashed line to estimate when the spring stops moving. Now vary the spring constant (use the slider labeled "spring 3") and repeat the experiment for several different spring constants but with the same mass. For each experiment, write down the relative spring constant and the approximate time for the spring to stop oscillating. What can you say about the relationship between the spring constant and the damping time? a A decrease in the spring constant causes a decrease in the damping time. b An increase in the spring constant causes a decrease in the damping time. c The damping time is independent of the spring constant. d The spring constant and the friction force exactly cancel

b An increase in the spring constant causes a decrease in the damping time.

Occasionally, during earthquakes, areas near the epicenter are not damaged while those farther away are damaged. Why could this occur? a Destructive interference results in waves with greater amplitudes being formed in places farther away from the epicenter. b Constructive interference results in waves with greater amplitudes being formed in places farther away from the epicenter. c The standing waves of great amplitudes are formed in places farther away from the epicenter. d The pulse waves of great amplitude are formed in places farther away from the epicenter.

b Constructive interference results in waves with greater amplitudes being formed in places farther away from the epicenter.

How does the entropy of a system depend on how the system reaches a given state? a Entropy depends on the change of phase of a system, but not on any other state conditions. b Entropy does not depend on how the final state is reached from the initial state. c Entropy is least when the path between the initial state and the final state is the shortest. d Entropy is least when the path between the initial state and the final state is the longest.

b Entropy does not depend on how the final state is reached from the initial state.

An object is undergoing uniform circular motion. True or False: A graph of its position oscillates back and forth, but not with simple harmonic motion. a True b False

b False

With reference to waves, what is a "disturbance?" a It refers to the resistance produced by some particles of a material. b It refers to an oscillation produced by some energy that creates a wave. c It refers to the wavelength of the wave. d It refers to the speed of the wave.

b It refers to an oscillation produced by some energy that creates a wave.

Is light a mechanical wave? Explain. a No, because light requires a medium to travel through. b No, because light does not require a medium to travel through. c Yes, because light requires a medium to travel through. d Yes, because light does not require a medium to travel through.

b No, because light does not require a medium to travel through.

Which type of car would bounce fewer times after a bump: a car with underdamped springs or a car with critically damped springs? a The car with underdamped springs. b The car with critically damped springs.

b The car with critically damped springs.

What is the statement of the first law of thermodynamics? a The change in internal energy of a system equals the sum of net energy transferred by heat into the system and the net work done by the system. b The change in internal energy of a system equals the net energy transferred by heat into the system minus the net work done by the system. c The change in internal energy of a system equals the product of net energy transferred by heat into the system and the net work done by the system. d The change in internal energy of a system equals the net energy transferred by heat into the system divided by the net work done by the system.

b The change in internal energy of a system equals the net energy transferred by heat into the system minus the net work done by the system.

In the case of very small deformations, what usually happens to the deformed object once the force is removed? a The object starts to oscillate. b The object returns to its original shape. c The object remains deformed unless some external force acts on it. d The object continues to get deformed unless an external force acts on it.

b The object returns to its original shape.

What is the formula for pressure-volume work? a W=VΔP b W=PΔV c W=ΔVP d W=PΔV

b W=PΔV

What is periodic motion? a the trajectory of an object thrown upwards against gravity b motion that repeats itself at regular time intervals c motion that repeats itself between two fixed points at varied time intervals d motion around a circular path with varying acceleration

b motion that repeats itself at regular time intervals

If the volume of an ideal gas increases while pressure remains constant, is the value of work done by the system W positive or negative? Will this increase or decrease the internal energy of the system? a positive: internal energy will decrease b positive: internal energy will increase c negative: internal energy will decrease d negative: internal energy will increase

b positive: internal energy will increase

How much will a spring that has a force constant of 40.0 N/m be stretched by an object with a mass of 0.500 kg when hung motionless from the spring? a 20.0 m b 0.013 m c 0.123 m d 2.04 m Calculate the decrease in gravitational potential energy of the 0.500-kg object when it descends this distance. a -4.90 J b -0.062 J c -0.064 J d -0.600 J

c 0.123 m d -0.600 J

A gas does 10J of work in a cyclic process. What is the net heat transfer into the system? a −10J b 0J c 10J d 20J

c 10J

A home heat pump has a coefficient of performance of 4. After years of use the heat pump can output half as much heat with the same input work. What is the new coefficient of performance? a (1/8) b (1/2) c 2 d 8

c 2

Multi-part question Fish are hung on a spring scale to determine their mass (most fishermen feel no obligation to truthfully report the mass). What is the force constant of the spring in such a scale if it the spring stretches 8.00 cm for a 10.0 kg load? a 1.25×102N/m b 7.84N/m c 0.80N/m d 1.23×103N/m What is the mass of a fish that stretches the spring 5.50 cm? a 67.4 kg b 660 kg c 6.88 kg d 14.5 kg How far apart are the half-kilogram marks on the scale? a 8.00 mm b 4.00 mm c 0.41 m d 2.00 mm

c 6.88 kg d 1.23×103N/m b 4.00 mm

What happens to the capacity of a system to do work as the system becomes more disordered? a It is conserved. b It varies during the process of increasing disorder. c It increases. d It decreases.

c It increases.

What is net transfer of energy by heat? a It is the sum of all energy transfers by heat into the system. b It is the product of all energy transfers by heat into the system. c It is the sum of all energy transfers by heat into and out of the system. d It is the product of all energy transfers by heat into and out of the system.

c It is the sum of all energy transfers by heat into and out of the system.

Consider two identical springs. At the start of an experiment, Spring A is already stretched out 3 cm, while Spring B remains at the zero position. Both springs are then stretched an additional three centimeters. What conclusion can you draw about the force required to stretch these springs during the experiment? a It requires four times as much force to stretch Spring A. b It requires the same amount of force to stretch the springs. c It requires twice as much force to stretch Spring A. d It requires twice as much force to stretch Spring B.

c It requires twice as much force to stretch Spring A.

What is the effect on the period of a pendulum if you double its length? a Period increases by a factor of 4 b Period decreases by a factor of 2 c Period increases by a factor of 1.41 ( 2-√ 2) d Period decreases by a factor of 1.41 ( 2-√ 2) what is the effect on the period of a pendulum if you decrease its length by 5.00%? a Period decreases to 90.3% of old period b Period decreases to 97.5% of old period c Period decreases to 95.0% of old period d Period increases by 22.4 % of old period

c Period increases by a factor of 1.41 ( 2-√2) b Period decreases to 97.5% of old period

How and why does a dissipative process like friction affect the efficiency of an ideal heat engine? a The efficiency decreases since dissipative processes increase the temperature. b The efficiency increases since the friction does not do work. c The efficiency decreases since dissipative processes convert some work output to wasted heat. d The efficiency increases since the processes create heat.

c The efficiency decreases since dissipative processes convert some work output to wasted heat.

What best describes the relationship between the frequency of an oscillation and the period of the oscillation? a The frequency equals the period. b The frequency equals the period squared. c The frequency equals one over the period. d The frequency equals one over the period squared.

c The frequency equals one over the period.

Why is there a negative sign in the equation for Hooke's law? a The negative sign indicates that displacement decreases with increasing force. b The negative sign indicates that the direction of the applied force is opposite to that of displacement. c The negative sign indicates that the direction of the restoring force is opposite to that of displacement. d The negative sign indicates that the force constant must be negative.

c The negative sign indicates that the direction of the restoring force is opposite to that of displacement.

A piece of gum is stuck to the outer edge of a horizontal turntable, which is revolving at a constant speed. The shadow of the gum is projected onto a wall behind the turntable. How does the frequency of rotation of the turntable compare to the frequency of oscillation of the gum's shadow? a The turntable's frequency is four times the shadow's frequency. b The turntable's frequency is twice the shadow's frequency. c The turntable's frequency is equal to the shadow's frequency. d The turntable's frequency is half the shadow's frequency.

c The turntable's frequency is equal to the shadow's frequency.

In the equation, ΔS=Q/T , what does T stand for? a increased temperature of the system b decreased temperature of the system c absolute temperature of the system d average temperature of the system

c absolute temperature of the system

What term may be used to describe how much energy has been dispersed in a process? a internal energy b work c entropy d enthalpy

c entropy

Which of the following involves work done BY a system? a increasing internal energy b compression c expansion d cooling

c expansion

what are oscillations? a motion resulting in small displacements b motion which repeats itself periodically c periodic repetitive motion between two points d motion opposite to the direction of restoring force

c periodic repetitive motion between two points

In periodic motion, what is a period T a the time for which the external force was acting b the number of oscillations in 1s c the time taken to complete one oscillation d the time taken to reach the maximum displacement from the mean position

c the time taken to complete one oscillation

Two waves carry the same power, but the first wave covers 3 times the area as the second. How do the intensities of the two waves compare? a The first wave has 9 times the intensity as the second wave. b The first wave has 3 times the intensity as the second wave. c The first wave has the same intensity as the second wave. d The first wave has 1/3 the intensity as the second wave

d The first wave has 1/3 the intensity as the second wave

Two heat engines each go through a process at the same temperature. The change in entropy of the first engine's process is 8 times the change in entropy of the second engine's process. How does the heat absorbed by the first engine compare to the heat absorbed by the second engine? a The heat absorbed by the first engine is 18 the heat absorbed by the second engine. b The heat absorbed by the first engine is 14 the heat absorbed by the second engine. c The heat absorbed by the first engine is 4 times the heat absorbed by the second engine. d The heat absorbed by the first engine is 8 times the heat absorbed by the second engine.

d The heat absorbed by the first engine is 8 times the heat absorbed by the second engine.

What is the time period of a 6cm long pendulum on earth? a 80s b 4.9s c 0.08s d 0.49s

d 0.49s

What would be the frequency of a 0.5 kg mass oscillating on a spring with spring constant k = 5 N/m? a 10 s b 1.6 s c 2.0 Hz d 0.5 Hz

d 0.5 Hz

If the vertical distance (i.e., the distance in the direction perpendicular to the direction of propagation) between a crest and the adjacent trough of a sine wave is 1m , what is the amplitude of the wave? a 4m b 2m c 1m d 0.5m

d 0.5m

What is the change in entropy when 2.00kg of water at 100∘C is heated to form steam at 100∘C? a 2.42×107J/K b 1.21×107J/K c 2.42×104J/K d 1.21×104J/K

d 1.21×104J/K

Find the increase in entropy of 1.00kg of ice that is originally 0∘C at and melts to form water at 0∘C . a 0.612×101J/K b 0.612×103J/K c 1.22×101J/K d 1.22×103J/K

d 1.22×103J/K

Fish are hung on a spring scale to determine their mass (most fishermen feel no obligation to truthfully report the mass). What is the force constant of the spring in such a scale if it the spring stretches 8.00 cm for a 10.0 kg load? a 1.25×102N/m b 7.84N/m c 0.80N/m d 1.23×103N/m

d 1.23×103N/m

The length of nylon rope from which a mountain climber is suspended has a force constant of 1.40×104N/m . What is the frequency at which he bounces, given his mass plus and the mass of his equipment are 90.0 kg? a 0.01 Hz b 0.50 Hz c 12.5 Hz d 1.99 Hz How much would this rope stretch to break the climber's fall if he free-falls 2.00 m before the rope runs out of slack? Hint: Use conservation of energy. a 43.9 cm b 6.30 cm c 25.2 cm d 50.2 cm Repeat both parts of this problem in the situation where twice this length of nylon rope is used. .71 a 1.00 Hz, 1.00 m b 1.41 Hz, 35.5 cm c 1.40 Hz, 71.0 cm d 2.81 Hz, 71.0 cm

d 1.99 Hz d 50.2 cm c 1.40 Hz, 71.0 cm

The shadow of a car from a ferris wheel moves back and forth along the ground while the sun is directly overhead at noon. If the ferris wheel completes two revolutions per minute and has a maximum velocity of 2.1 m/s, what is the ferris wheel's diameter? a 1.2 m b 10 m c 24 m d 20 m

d 20 m

Calculate the intensity of a wave if the power transferred is 10W and the area through which the wave is transferred is 5square meters. a 200W/m^2 b 50W/m^2 c 0.5W/m^2 d 2W/m^2

d 2W/m^2

A simple harmonic oscillator has time period 4s . If the mass of the system is 2kg , what is the force constant of the spring used? a 0.81N/m b 0.202N/m c 0.125N/m d 4.93N/m

d 4.93N/m

What is the acceleration due to gravity in a region where a simple pendulum having a length 75.000cm has a period of 1.7357s ? a 982.8m/s2 b 0.24895m/s2 c 0.05723m/s2 d 9.8281m/s2

d 9.8281m/s2

A cellist plucks the string of her instrument 0.01 m from equilibrium to play a note during a piece. If the string has a potential energy of 50 J when it is released, what is its velocity at 0.002 m? Assume the string has a mass of 0.01 kg. a 490 m/s b 102 m/s c 100 m/s d 98 m/s

d 98 m/s

What is the statement for the second law of thermodynamics? a All the spontaneous processes result in decreased total entropy of a system. b All the spontaneous processes result in increased total entropy of a system. c All the spontaneous processes result in decreased or constant total entropy of a system. d All the spontaneous processes result in increased or constant total entropy of a system.

d All the spontaneous processes result in increased or constant total entropy of a system.

A power plant is 52% efficient and produces 1.5×1013kJ of work output daily. A second power plant is 55% efficient and produces 1.7×10^13kJ of work output daily. Which one releases more energy into the surroundings? a Power plant 1 releases 7.8×10^12kJ energy. Power plant 2 releases 9.4×10^12kJ energy. b Power plant 1 releases 4.4×10^13kJ energy. Power plant 2 releases 4.8×10^13kJ energy. c Power plant 1 releases 2.9×10^13kJ energy. Power plant 2 releases 3.1×10^13kJ energy. d Power plant 1 releases 1.4×10^13kJ energy. Power plant 2 releases 1.4×10^13kJ energy.

d Power plant 1 releases 1.4×10^13kJ energy. Power plant 2 releases 1.4×10^13kJ energy.

With reference to simple harmonic motion, what is equilibrium position? a The position where the restoring force is the maximum. b The position where the displacement is maximum. c The position where velocity is the minimum. d The position where the object rests in the absence of force.

d The position where the object rests in the absence of force.

Two identical waves interfere purely constructively. How does the resultant intensity compare to the intensities of the individual waves? a The resultant intensity is equal to the intensity of one of the individual waves. b The resultant intensity is twice the intensity of one of the individual waves. c The resultant intensity is half the intensity of one of the individual waves. d The resultant intensity is four times the intensity of one of the individual waves.

d The resultant intensity is four times the intensity of one of the individual waves.

What is thermal efficiency of an engine? Can it ever be 100% ? Why or why not? a Thermal efficiency is the ratio of the output (work) to the input (heat). It is always 100% . b Thermal efficiency is the ratio of the output (heat) to the input (work). It is always 100% . c Thermal efficiency is the ratio of the output (heat) to the input (work). It is never 100% . d Thermal efficiency is the ratio of the output (work) to the input (heat). It is never 100%

d Thermal efficiency is the ratio of the output (work) to the input (heat). It is never 100%

What are the ways to add energy to or remove energy from a system? a Transferring energy by heat is the only way to add energy to or remove energy from a system. b Doing compression work is the only way to add energy to or remove energy from a system. c Doing expansion work is the only way to add energy to or remove energy from a system. d Transferring energy by heat or by doing work are the ways to add energy to or remove energy from a system.

d Transferring energy by heat or by doing work are the ways to add energy to or remove energy from a system.

A simple harmonic oscillator reaches its maximum speed at which point in its motion? a at the point where the force is a maximum b half-way between the maximum displacement and the equilibrium point c at the maximum displacement d at the equilibrium point

d at the equilibrium point

In the equation ΔU=Q−PΔV , what does ΔV indicate? a change in pressure b change in temperature c change in internal energy d change in volume

d change in volume

What contributes to the phenomenon of sound resonances a neither constructive nor destructive interference b constructive interference only c destructive interference only d constructive and destructive interference

d constructive and destructive interference

In real-world scenarios, which of the following is an example of a damped harmonic oscillator? 1a swing, moving back and forth in the wind 2a seesaw, rocking up and down 3a plucked violin string a example 1 b example 2 c example 3 d examples 1, 2 and 3

d examples 1, 2 and 3

What is the equation for the change in entropy? ΔS=QT^2 b ΔS=QT c ΔS=Q/T^2 d ΔS=Q/T

d ΔS=Q/T