11. A car travels 500 miles at an average speed of 54. 9 mi/hr. How long will the trip take?

The Earth's temperature without an atmosphere, determined by substituting 342 W/m² for outgoing longwave radiation and rearranging the Stefan-Boltzmann equation, is approximately 255 K.

By substituting the given values into the Stefan-Boltzmann equation, we can solve for the Earth's temperature without an atmosphere. Assuming an emissivity of 1, the equation becomes 342 = (5.67 × 10^-8) × T^4. Solving for T yields a temperature of approximately 255 K.

Converting this temperature to degrees Celsius, we subtract 273.15 to obtain approximately -18.15 °C. Similarly, converting to degrees Fahrenheit using the conversion formula, we find approximately -0.67 °F.

This temperature of -18.15 °C (or -0.67 °F) represents the hypothetical temperature of the Earth without an atmosphere. Comparing it to the actual average temperature of the Earth, around 15 °C (or 59 °F), we can see that it is significantly colder. The presence of the atmosphere is crucial for trapping heat through various greenhouse gases, such as carbon dioxide and water vapor, which maintain a habitable temperature range on Earth. Without the atmosphere's greenhouse effect, the Earth's temperature would be much colder, emphasizing the vital role played by our atmosphere in sustaining life on the planet.

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The type of circuit shown in the diagram is a closed series circuit. The Option C.

The circuit diagram illustrates a closed series circuit, where the components are connected in a series, forming a single loop. In a closed series circuit, the current flows through each component in sequence, meaning that the current passing through one component is the same as the current passing through the other components.

The flow of current is uninterrupted since the circuit forms a complete loop with no breaks or open paths. Therefore, the correct answer is a closed series circuit.

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Explanation:

The potential energy of an object has the following formula

         Potential energy = mgh

      where m = mass of the object

                   g = acceleration due to gravity

                   h = height of the object

This means that the potential energy of an object depends upon its mass, acceleration due to gravity, and height.

In the given situation we have a bucket full of water. If the mass and acceleration due to gravity are not changed, the only way the potential energy can be decreased is by reducing the height of the bucket full of water.

This can be done by: -

         (i) Lifting the bucket full of water in such a way that you

             decrease its height as compared to the bench.

        (ii) Put the bucket full of water on a stool whose height is

            lower than the bench.

Answer:

1.By decreasing it's contents- this decreases the weight of the bucket thus decreasing the potential energy of the bucket.

2.By decreasing the height of the bench we have decreased the amount of potential energy stored in the bucket

The kinetic energy of the car is four times greater at the bottom than it is at the top. At the base of the hill, the car's kinetic energy is 1800 joules.

The momentum an object has as a result of motion is known as kinetic energy. We must exert force on an object if we desire to accelerate it. To apply a force, we must exert effort. Once the work is finished, the objects will be moving because energy has now been transferred to it.

Describe that a travelling internal force and speed are major factors that impact the amount of kinetic energy it will possess. Partially particles can result in the loss of kinetic energy through frictional, sound, and heat.

k = 1 /2 mv²

K = 1 /2 (100 kg) (3 m/s)²

= 450 J

K = 1 /2 (100 kg) (6 m/s)²

k = 1800 J

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With the use of range formula, also, in multiple of 180 degree, 59 and 239 degrees are the angles of projection.

A projectile in kinematic under physics can be defined as any object that is projected or thrown to take a trajectory path.

Given that a tennis player makes a return at a speed of 15 m/s and at height of 3m to land in the court at a horizontal distance of 12 m from her.

Let us assume that the ball fall at height 3m. U = 0. Let us find the time

h = ut + 1/2gt²

3 = 0 + 1/2 × 9.8 × t²

3 = 4.9t²

t² = 3/4.9

t² = 0.612

t = √0.612

t = 0.782 s

Total time T = 2t

T = 2 × 0.782

T = 1.564 s

The possible angles of projection of the ball can be calculated by using the range formula

R = UcosФT

12 = 15cosФ × 1.564

12 = 23.46cosФ

cosФ = 12 / 23.46

cosФ = 0.512

Ф = \(Cos^{-1}\) (0.512)

Ф =  59. 2 degree

Ф = 59°

Therefore,  the possible angles of projection of the ball are 59° and 239°

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When the speed of sound in the pipe increases, the frequency and wavelength of the first harmonic will both increase. Therefore, the correct answer is C (increase, increase).

When an adjustment is made which causes the speed of sound in the pipe to increase, the frequency of the first harmonic also increases while the wavelength remains unchanged. This is because the frequency of a wave is directly proportional to its speed, and the wavelength is inversely proportional to its speed. Thus, when the speed of sound increases, the frequency of the first harmonic increases while the wavelength remains constant.

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Answer:

Mars

Explanation:

It would be Mars because Mars has the least mass out of al the planets in the Solar System, and that would affect its gravitational pull.

I hope it helps! Have a great day!

Anygays-

It is correct to state that if the human race continues to use energy as it currently does, without change, we will see negative environmental impacts all over the world in this century.

Global warming is the heating of the Earth's surface seen since the pre-industrial period because of human activities, mainly the combustion of fossil fuels, which boosts heat-trapping greenhouse gas levels in the Earth's atmosphere.

As an example, vehicles that run on fossil fuels, such as cars and buses, emit polluting gases into the atmosphere, causing the greenhouse effect and contributing to global warming.

To address these issues, it is necessary to raise public awareness so that there is a growing interest in and search for environmentally responsible solutions, such as mass production of electric cars that do not pollute the environment.

It is right to argue that if the human race persists to use power in the same manner that it as of now does, we will see negative environmental impacts all over the world in this century.

Thus, these are some of the consequences regarding the given scenario.

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To find the current in the resistor, we can use Ohm's Law and the concept of equivalent resistance. Thus, option A is correct.

First, let's calculate the equivalent resistance of the three cells connected in parallel. When resistors are connected in parallel, the reciprocal of the equivalent resistance is equal to the sum of the reciprocals of the individual resistances:

1/Req = 1/R1 + 1/R2 + 1/R3

Given that R1 = R2 = R3 = 22 Ω (internal resistance of each cell), we can substitute the values:

1/Req = 1/22 + 1/22 + 1/22

1/Req = 3/22

Taking the reciprocal of both sides, we find:

Req = 22/3 Ω

Now we can use Ohm's Law to calculate the current (I) in the resistor. Ohm's Law states that the current flowing through a resistor is equal to the voltage across it divided by its resistance:

I = V/R

Given that V = 1.1 V (emf of each cell) and R = 32 Ω (resistance), we can substitute the values:

I = 1.1/32

Calculating this value, we find:

I ≈ 0.034375 A

Therefore, the current in the resistor is approximately 0.034375 A.

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Answer: A. silicon and oxygen

Explanation:

The two most abundance elements in earth's crust are silicon and oxygen.

The most abundant element in earth's crust is Oxygen (O) which has a percentage composition of 46.6%.  Oxygen is mainly present as silicates, carbonates, sulphates etc.

The second most abundant element in earth's crust is Silicon (Si) which has a percentage composition of 27.7% . Silicon is present in the form of silicates.

The third most abundant element in earth's crust is aluminium (Al) which has a percentage composition of 8.1 %.

The fourth most abundant element in earth's crust is Iron (Fe) which has a percentage composition of 5.0 %.

Answer:

A

Explanation:

(a) On average, the farmer will have to draw water out of the well approximately 2 times to fill the larger bucket when its volume is v = 1. (b) When the volume of the larger bucket is v = 2, on average, the farmer will have to draw water out of the well approximately 4 times to fill it.

In this scenario, the farmer uses a smaller bucket with a capacity of 1 unit of volume to fill a larger bucket with a volume of v units. The amounts of water drawn from the well form a sequence of independent uniform random variables over the interval [0, 1].

(a) When the volume of the larger bucket is v = 1, it means that the larger bucket has the same capacity as the smaller bucket. To fill the larger bucket, the farmer needs to draw water until its total volume reaches 1. On average, it takes approximately 2 draws to fill the larger bucket completely.

(b) When the volume of the larger bucket is v = 2, the farmer needs to draw water until the larger bucket's total volume reaches 2. Since each draw yields a random value between 0 and 1, on average, it takes approximately 4 draws to achieve a total volume of 2 in the larger bucket.

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Answer:

Release

Explanation:

The water is heated until

Answer:

External locus of control

Explanation:

External locus of control is an attitude people possess that makes them attribute their failures or successes to factors other than themselves. The opposite of this type of attitude is the Internal locus of control where the individuals take responsibility for the outcomes of their actions whether good or bad. One good thing about the external locus of control is that when the individuals with this characteristic record successes, they attribute it to others and this presents them as people with team spirit. However, when they record failures, they do not want to take the blame, but rather attribute it to others.

Fred exhibits an external locus of control because he attributed his speeding to other factors like the road signs and GPS instead of fully admitting that it was his fault.

Answer:

number 2

Explanation:

Bose-Einstein statistics apply to particles called bosons, which have integer spins, and can occupy the same quantum state. Fermi-Dirac statistics apply to particles called fermions, which have half-integer spins and are subject to the Pauli Exclusion Principle, meaning they cannot occupy the same quantum state.

Classical particles follow the laws of classical mechanics, whereas quantum particles obey the principles of quantum mechanics. In classical mechanics, particles have well-defined positions and velocities, while quantum particles are described by wave functions that determine the probabilities of their positions and momenta.
Bose-Einstein statistics apply to particles called bosons, which have integer spins, and can occupy the same quantum state. Fermi-Dirac statistics apply to particles called fermions, which have half-integer spins and are subject to the Pauli Exclusion Principle, meaning they cannot occupy the same quantum state.
A transition from Fermi-Dirac to Maxwell-Boltzmann statistics occurs when the quantum effects become negligible. This typically happens at high temperatures or low particle densities, where the particles behave more classically. The Boltzmann distribution can be considered a limiting case of the Fermi-Dirac distribution under these conditions.
For a system with only three particle states (e1, e2, e3), the maximum number of fermions is three. This is because, according to the Pauli Exclusion Principle, each fermion must occupy a unique quantum state.
The entropy of an ideal fermion gas can be shown to agree with the Third Law of Thermodynamics, which states that the entropy of a system approaches zero as its temperature approaches absolute zero. In an ideal fermion gas, at absolute zero, all fermions occupy their lowest energy states, and the system's entropy reaches its minimum value, consistent with the Third Law.

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original taste

Explanation:

islam new jersey

The speed of the first car is 52 mph.

The speed of the second car is 40 mph.

Let's use "x" mph to represent the second car's speed. We can express the first car's speed as "x + 12" mph because it is 12 mph faster. According to our knowledge, the first car travelled 234 miles, while the second car covered 180 miles.

The relationship between speed and distance travelled is inversely proportional. As a result, the proportion of distances covered by the two vehicles will match the proportion of their speeds:

234 / 180 = (x + 12) / x

To solve this equation, we can cross-multiply:

234x = 180(x + 12)

Expanding the equation:

234x = 180x + 2160

Rearranging terms:

234x - 180x = 2160

54x = 2160

Dividing both sides by 54:

x = 40

Therefore, the speed of the second car is 40 mph.

To find the speed of the first car, we can substitute the value of x back into the expression "x + 12":

x + 12 = 40 + 12 = 52

Hence, the speed of the first car is 52 mph.

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80Sec or 1.33 min time taken by train to cross a bridge with a uniform speed of 36 kmph.

Given data,

length of bridge = 600m

length of train = 200m

Length of bridge + Length of train is the total distance travelled by train to cross the bridge.

So, 600+200 = 800m = 0.8km

Now, applying the formula for time,

\(time =\frac{distance}{speed}\)

\(time = \frac{0.8}{36}\)

time = 0.022hours

time in seconds= 0.022×60×60

time in seconds= 1.33×60

time in seconds= 80seconds

Therefore, 80Sec or 1.33 min time taken by train to cross a bridge with a uniform speed of 36 kmph.

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The amount of heat that needs to be removed from surface A per unit area to maintain its constant temperature is 409.3 W/m².

(a) Reynolds number is a non-dimensional parameter in fluid dynamics that is used to estimate the type of fluid flow. It expresses the ratio of inertial forces to viscous forces, which can be seen as the relative importance of these two forms of forces for given flow conditions. It has physical significance since the Reynolds number is used to forecast flow patterns in various engineering systems such as fluid dynamics, heat transfer, mass transfer, and others.(b) Reynolds number (Re) is given by the equation, Re = ρvL/μ

Where, ρ is the fluid density, v is the velocity of the fluid, L is the characteristic length, and μ is the fluid viscosity. Given, Length of coach, L = 6 m

Velocity of the coach, v = 100 km/h = 27.78 m/s

Density of air, ρ = 1.2 kg/m³

Viscosity of air, μ = 1.8 × 10⁻⁵ kg/ms

Re = (ρvL)/μ

= (1.2 × 27.78 × 6)/1.8 × 10⁻⁵

= 2.0833 × 10⁸

From the Reynolds number values, it can be concluded that the flow is turbulent since the Reynolds number is greater than 4000. Hence the flow of air over the coach is turbulent.

(a) Emissivity refers to the measure of an object’s capacity to emit thermal radiation relative to that of a perfect black body.

It is dimensionless and varies from 0 to 1, indicating the effectiveness of an object to emit energy to the surroundings concerning a black body of the same temperature. It is represented by the Greek symbol ε. Emissivity ranges between 0 and 1, with black surfaces having ε = 1, and surfaces that reflect all radiation have ε = 0.(b)The rate of heat transfer between two surfaces is given by the Stefan-Boltzmann law as,

Q/A = εσ(T₁⁴ − T₂⁴)

Here, Q/A is the amount of heat energy transfer per unit area, ε is the emissivity of surface A, σ is the Stefan-Boltzmann constant, T₁ is the temperature of surface A, and T₂ is the temperature of surface B.

Given, ε = 0.97,

A = 1 m²,

T₁ = 200°C = 473 K,

T₂ = 800°C = 1073 K,

σ = 5.67 × 10⁻⁸ W/m².K⁴

Substituting the values in the equation,Q/A = εσ(T₁⁴ − T₂⁴)= 0.97 × 5.67 × 10⁻⁸ (473⁴ − 1073⁴)= - 409.3 W/m²

Therefore, the amount of heat that needs to be removed from surface A per unit area to maintain its constant temperature is 409.3 W/m².

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As of my knowledge cutoff in September 2021, no space probes have flown past Uranus closely enough to take detailed pictures.

The only spacecraft that has ever visited Uranus is Voyager 2, which conducted a flyby of the planet in 1986. During the flyby, Voyager 2 captured images and collected data, providing valuable information about the planet and its moons. However, the images obtained were not at a level of detail considered "detailed pictures" by today's standards. It's important to note that my information is accurate up until September 2021, and there may have been new missions or developments since then. For the most up-to-date information, it is recommended to refer to reliable sources or official space agency announcements.

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(a) 0.300 A. is the magnitude of the current in the circuit. (b) infinity is the time at which the voltage reaches 8.00 V. (c) The rate at which energy is being stored in the capacitor is 2.40 watts.

(a) To determine the magnitude of the current when the voltage across the capacitor is 8.00 V, Ohm's Law can be applied. The current (I) in the circuit can be calculated as I = ε/R, where ε is the battery voltage and R is the resistance. Substituting the given values, I = 36.0 V / 120 Ω = 0.300 A.

(b) The time it takes for the voltage across the capacitor to reach 8.00 V can be determined by considering the charging time constant of the RC circuit. The charging time constant (τ) is given by the product of the resistance and the capacitance, τ = RC. Substituting the given values, τ = (120 Ω) × (5.00 μF) = 600 μs. To find the time (t) at which the voltage across the capacitor reaches 8.00 V, we can use the formula t = τ × ln(Vf/Vi), where Vf is the final voltage (8.00 V) and Vi is the initial voltage (0 V). Solving the equation, t = 600 μs × ln(8.00/0) = infinity (the voltage across the capacitor never reaches 8.00 V in this circuit configuration).

(c) The rate at which energy is being stored in the capacitor when the voltage across it is 8.00 V can be calculated by multiplying the current flowing through the capacitor by the voltage. Using the previously calculated current value (0.300 A) and the voltage (8.00 V), the rate of energy storage is P = IV = 0.300 A × 8.00 V = 2.40 W. Therefore, when the voltage across the capacitor is 8.00 V, the rate of energy being stored in the capacitor is 2.40 watts.

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The formula for the mass remaining after t years for a sample of radium-226 with an initial mass of 100mg is given by \($M(t) = 100 \times 0.5^{t/1590}$\). After 1000 years, the mass is approximately 87mg. The mass will be reduced to 30mg after approximately 2167 years.

(a) The decay of radium-226 follows an exponential decay model, where the amount of radium remaining decreases by half every 1590 years. The formula for the mass remaining after t years can be derived using the half-life concept. Let M(t) represent the mass remaining after t years, then the equation can be written as \($M(t) = 100 \times 0.5^{t/1590}$\). Here, 100 represents the initial mass of the sample, and 0.5 is the decay constant derived from the half-life.

(b) To find the mass after 1000 years, we substitute t = 1000 into the formula: \($M(1000) = 100 \times 0.5^{1000/1590}$\). Evaluating this expression gives us approximately 87mg.

(c) To determine when the mass will be reduced to 30mg, we need to solve the equation \($M(t) = 30$\) for t. Substituting M(t) and rearranging the equation gives us \($100 \times 0.5^{t/1590} = 30$\). Solving this equation, we find t ≈ 2167 years. Therefore, it will take approximately 2167 years for the mass of the radium-226 sample to be reduced to 30mg.

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Answer:

should be A

Explanation:

there isn't a 3, so it must be his deceleration, which would be 5-3=2

the average velocity is given by the change in displacement divided by the change in time: average velocity = (change in displacement) / (change in time) = 8 ft / 1 sec = 8 ft/sec.

To determine the average velocity of the particle over the time interval [1, 2], we need to find the change in displacement and divide it by the change in time.

Given that the displacement function is s(t) = 5t^2 - 7t + 2, we can find the displacement at the endpoints of the interval:

s(1) = 5(1)^2 - 7(1) + 2 = 5 - 7 + 2 = 0

s(2) = 5(2)^2 - 7(2) + 2 = 20 - 14 + 2 = 8

The change in displacement is s(2) - s(1) = 8 - 0 = 8 feet.

The change in time is 2 - 1 = 1 second.

Therefore, the average velocity is given by the change in displacement divided by the change in time:

average velocity = (change in displacement) / (change in time) = 8 ft / 1 sec = 8 ft/sec.

Therefore, the correct answer is 3. average vel. = 8 ft/sec.

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Answer:

18

Explanation:

12 - 5 + 8 = 15

12 - 8 = 4

7 - 4 = 3

15 + 3 = 18

Answer:

Its D , Its is four times larger

Explanation:

I really hope this helps :)

Answer:

the inner regions of antarctica gets only about 2 inches of precipitation per year. the winds here blow up snow from the land and put it into the atmosphere, which is part of the water cycle. and the sun helps out, too, causing sublimation to occur, which causes snow to evaporate directly into water vapor gas.

Explanation:

good luck, hope this helps :)

have a nice day !!    

The resulting equation of motion for the system is given by m × x''(t) + k × x(t) = f(t), which is 2 × x''(t) + 18 * x(t) = 2 * sin(2t).

What is  equation of motion?

The equations of motion are a set of mathematical relationships that describe the motion of objects under the influence of forces. There are different sets of equations of motion, depending on the specific scenario and the type of motion being considered (linear motion, projectile motion, circular motion, etc.). The equations of motion for linear motion, also known as the equations of uniformly accelerated motion.

To find the equation of motion for the system, we start with Newton's second law of motion, which states that the sum of forces acting on an object is equal to the mass of the object multiplied by its acceleration. In this case, the object is the 2-kg mass attached to the spring.

The force exerted by the spring is proportional to the displacement of the mass from its equilibrium position, and it can be expressed as F_spring = -k× x(t), where k is the spring constant and x(t) is the displacement of the mass at time t.

In addition to the force exerted by the spring, there is an external force f(t) = 2 ×sin(2t) acting on the mass.

Applying Newton's second law, we have the equation of motion: m ×x''(t) + k ×x(t) = f(t).

Substituting the given values, m = 2 kg and k = 18 N/m, we obtain 2 ×x''(t) + 18 × x(t) = 2 ×sin(2t).

Therefore, the resulting equation of motion for the system is 2 × x''(t) + 18 × x(t) = 2 × sin(2t).

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The term for an orbit that electrons occupy at a fixed distance from the nucleus is called an energy level.

Electrons occupy specific energy levels in an atom, which are determined by the amount of energy required to move an electron from its present energy level to the next higher energy level. The energy levels are designated by a number, which ranges from one to seven. The lowest energy level is one, and the highest energy level is seven.

Electrons in the first energy level are the closest to the nucleus, while electrons in the seventh energy level are the farthest away.

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The work done by the child while pulling the 12 kg wagon a distance of 1.2 m with a 22 N force, in the absence of friction, is 26 J (joules).

The work done is calculated using the formula:

Work = Force × Distance × cos(θ)

Where:

Force is the applied force (22 N)

Distance is the displacement (1.2 m)

θ is the angle between the force and the direction of displacement (assuming it is 0 degrees, as there is no information provided regarding the angle)

Plugging the given values into the formula:

Work = 22 N × 1.2 m × cos(0) = 26 J

Therefore, the child would do 26 joules of work while pulling the wagon.

In conclusion, the correct answer is d) 26 J. The child would do 26 joules of work when pulling the 12 kg wagon a distance of 1.2 m with a 22 N force in the absence of friction. The calculation is based on the work formula, taking into account the given values.

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