what is the change in internal energy (in j) of a system that releases 675 j of thermal energy to its surroundings and has 9.70 × 102 cal of work done on it? give your answer in scientific notation.

In comparison to heat of fusion, water evaporation heat is stronger in magnitude. Compared to the heat of fusion, the heat of vaporization of water is significantly greater.

Clarification of the Problem For any substance to change from its solid phase to its liquid phase, a certain amount of energy is needed, known as the heat of fusion. Heat of vaporization, also known as enthalpy of vaporization, is the quantity of enthalpy (heat energy) required to change a liquid substance into a gas or vapour.  fusion is measured in Joules per Mole (J/mol), or calorie equivalents, at intervals (C).

Water evaporates as a result of heat. As a result of the molecules' rapid movement and vibration, water vapour is produced, which is released into the atmosphere.

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Answer:

Yeah, you can make gold from other elements.

Explanation:

To make gold out of other elements you need to have a nuclear reaction.

I hope it helps! Have a great day!
Muffin ^^

Answer:

Yes.

Explanation:

Gold can be made from other elements but it is too expensive so it’s not really worth it.

I hope it helps! Have a great day!

bren~

Answer:

hello, yes or nou sorry jaja

Given :

Intensity, I = 1.34 kW/m².

Area, A = 3.28 m².

To Find :

Time taken to arrive.

Solution :

Power is given by :

P = I × A

P = 1.34 × 3.28 × 1000 W

P = 4395.2  W

Also, power is given by :

P = E/t

t = E/P

t = 1.73 × 10⁹ J/4395.2 W

t = 393611 s

Converting this time in second to days, we get :

t = 393611/( 24×60×60) days

t = 4.55 days.

Hence, this is the required solution.

The type of radioactive decay that has a positive charge is alpha particles, which are positively charged.

The expression radioactive decay makes reference to the emission of ionizing radiation for a given atom, thereby an unstable atom may lose energy by releasing radiation.

Alpha particles are specific atomic particles consisting of 2 protons  (positive charge) and also 2 neutrons that share chemical bonds.

In conclusion, the type of radioactive decay that has a positive charge is alpha particles, which are positively charged.

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Answer: greater than

Explanation:

Angular momentum is a rotational motion measure defined as the product of an object's moment of inertia and its angular velocity. Angular momentum is commonly expressed in kilogram metres squared per second (kgm²/s). Angular momentum is a vector quantity in physics, which means it has both a magnitude and a direction. The right-hand rule asserts that if the fingers of the right hand are curled in the direction of the angular velocity vector, the thumb will point in the direction of the angular momentum vector.

An object's angular momentum can be computed by multiplying its moment of inertia by its angular velocity. Units of angular momentum expressed in kgm²/s.

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According to the information we can infer that it is true that when we grip the steering wheel, we should place our hands on the steering wheel at the 3 and 9 or 4 and 8 o'clock positions to allow room for airbags to deploy.

To determine if the declaration is true we have to look for some information related with the position of our hands while we drive a car. In this case we can conclude that when gripping the steering wheel some experts recommend to place your hands at the 3 and 9 o'clock positions or the 4 and 8 o'clock positions.

The main reason to use these positions is because these allow us to get a better control and also ensure that there is enough space for the airbags to deploy in case of an accident.

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The current of the river is 7 mph, and the speed the rower would row at in still water is 20 mph.

The speed downstream is : V + C).

distance between the cities = 18 miles,

time taken =  2/3 hour

(V + C) = 18 / (2/3) = 27 mph

The speed upstream is = V - C

distance between the cities = 18 miles

time taken upstream =  18/13 hour

(V - C) = 18 / (18/13)

= 13 mph

(V + C) = 27                           (Equation 1)

(V - C) = 13                            (Equation 2)

We add both equations:  

2V = 40

V = 20 mph

(20 + C) = 27

C = 27 - 20

C = 7 mph

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The motion of the rocket after its engines stop is that of a freely falling body. Once the engines stop, the only force acting on the rocket is gravity. It continues to move upward, slowing down under the influence of gravity until it reaches its maximum height. Then it starts falling back to Earth, accelerating due to gravity.

To determine the maximum height reached by the rocket, we can use the kinematic equation for displacement in vertical motion:

Δy = v_0y x t + (1/2) x a x t^2

where Δy is the displacement, v_0y is the initial vertical velocity, t is the time, and a is the acceleration.

In this case, the initial vertical velocity v_0y is 49.0 m/s, the acceleration a is -1.50 m/s² (negative because it's directed opposite to the upward motion), and the displacement Δy is 100 m (since the rocket reaches an altitude of 100 m).

Solving the equation for time t, we can find the time it takes for the rocket to reach its maximum height.

The total time the rocket is in the air can be found by considering the time it takes to reach the maximum height and then doubling it, as the rocket takes the same amount of time to descend back to the ground.

By performing the necessary calculations using the given values and equations, we can determine the maximum height reached by the rocket and the total time it is in the air.

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Answer:

Explanation:

like charges repel each other if one group of electrons has more mass it will push the other smaller mass of electrons away

Answer:

w = 0.196 rad / s

Explanation:

To generate an acceleration similar to that of the earth, the station's centripetal acceleration must be equal to the acceleration due to gravity.

               a_c = v² / r = w² r

               a_c = g

we substitute

               g = w² r

               w² = g / r

               w = \(\sqrt { \frac{g}{r} }\)

let's calculate

               w = √9.8/50

               w = 0.196 rad / s

therefore the station must rotate at that angular velocity so that the acceleration in the outer wall is equal to the ratio of gravity

The concept of race as a socio-historical construct highlights the importance of understanding the social, political, and economic contexts in which race is created and maintained.

According to Michael Omi and Howard Winant, in "Racial Formations," race is a socio-historical concept that is constructed through the intersection of cultural, political, and economic forces.

In this book, they argue that race is not an immutable, biologically determined characteristic of individuals or groups but rather a social construct that is created and maintained through systems of power and inequality.

The authors illustrate how race is constructed through examples from different historical periods and social contexts.

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According to the Boyle's law, the pressure of a gas is inversely proportional to the volume occupied by the gas, when it is held at a fixed temperature and has a certain mass.

The mathematical expression of Boyle's law can be written as,

P ∝ 1/V

where P is the pressure and V is the volume of the given gas.

So, we can write that,

PV = a constant

So, for considering two gases having the pressures as P₁ and P₂, and their volumes as V₁ and V₂, the equation according to Boyle's law can be written as,

P₁V₁ = P₂V₂

PV diagram of a gas is given.

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Attaching the image file here.

answer

64 is C (c) 1-Bromo-3-methylbutane

63 is D

i is secondary ii is primary

Answer:

How do you calculate how much useful energy is transferred?

Energy transferred electrically is calculated using the equation ΔE = IVt , where I is the current, V is the potential difference and t is time.

Explanation:

Answer:

I am afriad I don't think we can answer this one as it is asking you about your enviroment.

Explanation:

Answer:

(0.5x Time)²)

Explanation:

jump height = 4.9 x (0.5 x Time)2).

To use all the energy from consuming a small order of french fries, the person would need to climb the 11.0 m stairway approximately 17.0 times.

The energy content of the small order of french fries is given as 241.0 Cal. We can convert this value to joules since the unit of energy in the metric system is the joule (J). 1 calorie (Cal) is equal to 4.184 joules (J). To use all the energy from consuming a small order of french fries, the person would need to climb the 11.0 m stairway approximately 57 times.

Energy content of the small order of french fries:

241.0 Cal × 4.184 J/Cal = 1007.144 J

Work done to climb the stairway:

(55.0 kg) × (11.0 m) × (9.8 m/s²) = 59294 J

Number of climbs needed to use all the energy:

1007.144 J ÷ 59294 J ≈ 17.0

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Answer:

it would have run 498 miles

Explanation:

if the polar bear runs 8.3 every second then multiply 8.3 times sixty to get 498

Answer:

Informational references provide only a limited amount of specific statistical information. false. Information should be________to ensure more than one source provides the same factual information.

Explanation:

Answer:

The statement presented above is TRUE. Yes, it's up to us whether to accept the statement whether as reliable or not. At the end of the day, it is our responsibility to know the facts and not let other people dictate what you have to think about. It has to be taken into account that you can decide for yourself.

Explanation:

Answer:

Volume of CO2 at STP = 13.8 liter (Approx.)

Explanation:

Given:

Mass of CO2 = 27 gram

Find:

Volume of CO2 at STP

Computation;

We know that;

At STP, Volume of 1 mol of gas = 22.4 liter

Molar mass of CO2 = 44 g/mole

So,

Volume of CO2 at STP = [Mass of CO2 / Molar mass of CO2 ][22.4]

Volume of CO2 at STP = [27/44][22.4]

Volume of CO2 at STP = [0.6136][22.4]

Volume of CO2 at STP = 13.8 liter (Approx.)

There are many ways that a researcher can control experimenter bias.

The most important method is to use a double-blind study design.

This means that neither the experimenter nor the participant knows which treatment they are receiving.

In this way, the experimenter's bias is eliminated, as they cannot influence the outcome of the study.

A second method is to use random assignment.

This means that participants are randomly assigned to different groups, such as a control group and an experimental group.

This can help eliminate any pre-existing differences between the groups that could lead to bias.

A third method is to use a placebo.

This is a treatment that looks like the actual treatment, but does not have any active ingredients.

In this way, the experimenter's bias is eliminated, as they cannot influence the outcome of the study.

A fourth method is to use a single-blind study design.

This means that the participant does not know which treatment they are receiving.

In this way, the experimenter's bias is eliminated, as they cannot influence the outcome of the study.

A fifth method is to use a control group.

This means that the participant is compared to a group that is not receiving any treatment.

In this way, the experimenter's bias is eliminated, as they cannot influence the outcome of the study.

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The correct answer would be

D. Science and technology have increased food and reduced death rates due to illness and malnutrition.

I took this on USATestPrep, it's 100% right

The maximum possible efficiency of the engine is 54.1%. This means that the engine is able to convert 54.1% of the heat energy it absorbs into work, while the rest is expelled to the low temperature source. It is important to note that no heat engine can have an efficiency greater than 100%, as this would violate the laws of thermodynamics.

To find the maximum possible efficiency of the engine, we need to use the formula for efficiency, which is:
Efficiency = (1 - (T_Low/T_High)) x 100%
where T_Low is the temperature of the low temperature source in Kelvin and T_High is the temperature of the high temperature source in Kelvin.
First, we need to convert the temperatures from Celsius to Kelvin:
T_High = 365 + 273 = 638 K
T_Low = 20 + 273 = 293 K
Now we can plug in the values into the formula:
Efficiency = (1 - (293/638)) x 100%
Efficiency = 54.1%
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The maximum possible efficiency of a heat engine is given by the formula. Therefore, the correct answer is: 94.5%.

efficiency = (1 - Tlow/Thigh)
where Tlow is the temperature of the low temperature source and Thigh is the temperature of the high temperature source.
In this case, Tlow = 20.0 OC and Thigh = 365 OC.
So,
efficiency = (1 - 20.0/365)
efficiency = 0.945 or 94.5%
Therefore, the correct answer is: 94.5%.

To find the maximum possible efficiency of a heat engine that absorbs 350 J of heat from a 365°C high-temperature source and expels 225 J of heat to a 20.0°C low-temperature source per cycle, you can use the formula for the Carnot efficiency, which represents the highest possible efficiency for a heat engine operating between two temperature reservoirs.
Carnot efficiency = 1 - (T_low / T_high)
First, convert the temperatures from Celsius to Kelvin:
T_high = 365°C + 273.15 = 638.15 K
T_low = 20°C + 273.15 = 293.15 K
Now, calculate the Carnot efficiency:
Carnot efficiency = 1 - (293.15 K / 638.15 K) ≈ 0.541 or 54.1%
So, the maximum possible efficiency of the heat engine is 54.1%.

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When a person sings in a shower and causes the shower to resonate with a fundamental frequency of 73 Hz, this is an example of a standing wave, also known as a resonance.

The fundamental frequency of a standing wave is determined by the length of the resonant cavity, which in this case is the shower. The fundamental frequency is related to the length of the cavity by the equation:

f = v / 2L

where f is the frequency, v is the velocity of sound in the medium (in this case, air), and L is the length of the cavity. Given that the shower has a length of 2.40 meters and the fundamental frequency is 73 Hz, we can use the equation above to calculate the velocity of sound in air.

73 = v / (2 * 2.40)

Solving for v, we get:

= v

= (73 * 2 * 2.40)

= 350.4 m/s

The speed of sound in air is approximately 343 m/s at 20 °C at sea level. The velocity of sound in air can change with temperature, humidity and pressure. Given that the velocity of sound in air is around 343 m/s, the frequency of 73 Hz is a close match to the fundamental frequency of the shower with 2.40 meters high, It is important to note that the fundamental frequency is not the only frequency that could resonate in the shower, other overtones and harmonics might also resonate.

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Question- Someone is singing in a shower that measures 2.40 meters from floor to ceiling, and notices their voice causes the shower to resonate with a fundamental frequency of 73 Hz. Here, this situation is an example of? justify. The given situation is an example of which physics phenomenon and justify the given example with some details.

Answer:

100N

Explanation:

Force = Mass x Acceleration

Force = 0.4 kg x 250 m/s2

Force = 100N

The speeds are average and accelerated if pace explained his speed was 38km/h and fastest speed was 60km/h.

Pace was first moving at 38 km/h which was considered as  his average speed yet the fastest speed he went was 60 km/h so he accelerated up.

The average speed of a body in any  particular time interval is the distance covered by the body in that time interval divided by time. So if a particle covers a certain distance s in a time Time 1 to Time 2, then the average speed of the body is. In linear motion average speed is same as average displacement as distance and displacement in linear motion is same.

average speed=total distance travelled/total time taken

Now, talking about the accelerated speed which is highest speed attained by the object in its whole journey. Accelerated speed is variable in nature it regularly decrease or increase in small span of time.

Hence, correct speed are average, accelerated.

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(Complete question) is:

Pace left home at 8 AM to spend the day at an amusement park. He arrived at the park, which was 150 km from his house, at 10 AM. Pace explained that his speed was 38 km/h, which was a/an (accelerated / directional / instantaneous / average) speed, but the fastest speed he went was 60 km/h, which was a/an (directional / instantaneous / accelerated / average) speed.

The concentration of O2 in the trout stream is approximately 7.14 mg/L.

The concentration of O2 in a stream at equilibrium with air at 0.989 atm can be determined using the Henry's law constant (KH) for O2 in water. KH is the ratio of the concentration of a gas in a liquid to its partial pressure in the air above the liquid.

By using the KH value of 1.28 x 10^-3 mol/(L x atm) and the partial pressure of O2 in air at 0.989 atm, we can calculate the concentration of O2 in the stream.

To do so, we multiply the KH value by the partial pressure of O2, which gives us the concentration of O2 in the stream in units of mol/L. This value can then be converted to units of mg/L by multiplying by the molecular weight of O2, which is approximately 32 g/mol.

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