A 12.0 V car battery is being used to power the headlights of a car. Each of the two headlights has a power rating of 37.7 Watts. The number of electrons that pass through the car battery each second is ___ x 1019. Assume three significant digits in your answer. You do not need to use scientific notation when you enter your answer.

Answer: The scenario violates the second law of thermodynamics.

Explanation: The second law states that heat cannot be converted into work without some loss of usable energy, and that the amount of usable energy in a closed system will always decrease over time. Therefore, the machine described in the scenario cannot exist because it would violate the second law by converting all of the heat into electricity without any loss of usable energy.

Explanation:

The physical stimulation of the sense organs is known as sensation. The act of mentally classifying, interpreting, analyzing, and integrating stimuli from the senses and the brain is known as perception.

Therefore, sensory and perceptual development is very necessary in infants.

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The velocity of the boy skater if the mass is 50kg is 3 m/s.

The GUESCA method stands for Given, Unknown, Equation, Substitution, Calculation, and Answer. Let's use this method to solve the problem.

Given:

Mass of the girl (m₁) = 30 kg

Velocity of the girl (v₁) = -5 m/s (negative sign indicates backward direction)

Mass of the boy (m₂) = 50 kg

Velocity of the boy (v₂) = unknown (to be calculated)

Unknown:

Velocity of the boy (v₂)

Equation:

According to the law of conservation of momentum, the total momentum before the interaction is equal to the total momentum after the interaction. Mathematically, it can be expressed as:

(m₁ * v₁) + (m₂ * v₂) = 0

Substitution:

Plugging in the given values, we have:

(30 kg * -5 m/s) + (50 kg * v₂) = 0

Calculation:

Simplifying the equation, we get:

-150 kg·m/s + 50 kg·v₂ = 0

Rearranging the equation to solve for v₂, we find:

50 kg·v₂ = 150 kg·m/s

v₂ = 150 kg·m/s / 50 kg

v₂ = 3 m/s

Answer:

The velocity of the boy skater is 3 m/s.

Using the GUESCA method, we identified the given and unknown quantities, wrote the relevant equation, substituted the values, performed calculations, and obtained the answer.

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Answer:

A

Explanation: Car A is the fastest

The minimum stopping distance of the car is determined as 8 m.

The minimum stopping distance of the car is calculated as follows;

d = (u²)/(2a)

where;

when the minimum stopping distance = 2 m, initial velocity = 40 km/hr = 11.11 m/s

2 = (11.11²)/(2a)

a = (11.11²)/(2 x 2)

a = 30.86 m/s²

when the speed becomes 80 km/h, the minimum stopping distance is calculated as;

u = 80 km/h = 22.22 m/s

d = (22.22² )/ (2 x 30.86)

d = 8 m

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Answer:

Nutrients the body needs in relatively small amounts are called micronutrients. They include vitamins and minerals. Vitamins are organic compounds that are needed by the body to function properly. ... Vitamins and minerals do not provide energy, but they are still essential for good health

Explanation:

Answer:

Stars are the light bulbs of the universe.

Answer:

Stars are the recycling centers of the universe

Explanation:

I just did on edge C

1. The magnitude (in N) of the electric force that one particle exerts on the other is 6.68×10⁻⁸ N

2. The force is repulsive

Colulomb's law states as follow:

F = Kq₁q₂ / r²

Where

With the above formula, we can determine the force as illustrated below:

The following data were obtained from the question:

F = Kq₁q₂ / r²

F = (9×10⁹ × 7.24×10⁻⁹ × 3.78×10⁻⁹) / (1.92)²

F = 6.68×10⁻⁸ N

Thus, the magnitude of the force that one particle exert on the other is 6.68×10⁻⁸ N

The force is repulsive since the charges on each particle has the same sign

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Part 1: the final angular speed is 0.64 + 0.86 = 1.50 rad/s. Substituting the values, 1.05 J.

Angular speed is the rate of change of angular displacement of a body over a period of time. It is also known as rotational speed and is usually measured in revolutions per minute (RPM) or radians per second (rad/s).

Part 1:
The angular speed is given by the formula w = Iα, where w is the angular speed, I is the moment of inertia and α is the angular acceleration. Since the moment of inertia is constant, the change in angular speed is given by Δw = ΔIα.
The change in moment of inertia is given by ΔI = mr2, where m is the mass of the objects and r is the change in radius.
So, the change in angular speed is given by Δw = mr2α.
Substituting the given values,
Δw = (3 kg)(1 m - 0.3 m)2(0.64 rad/s)
Δw = 0.86 rad/s
Therefore, the final angular speed is 0.64 + 0.86 = 1.50 rad/s.

Part 2:
The change in kinetic energy of the system is given by ΔK = ΔIw2/2.
Substituting the values,
ΔK = (3 kg)(1 m - 0.3 m)2(1.50 rad/s)2/2
ΔK = 1.05 J.

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The mass of the sculpture is approximately 0.56 kg if fundamental frequency is given.

The fundamental frequency:

\(f = (1/2L) \sqrt{(T/μ)}\)

where L : wire's length, T : tension, and linear mass density of the wire, and f : frequency.

L = 90 cm = 0.9 m, f = 80 Hz, and = 5.0 g/m = 0.0050 kg/m are the given values in this problem. It is required of us to determine the sculpture's mass, M.

We must first determine the tension T of the wire in order to solve for M. We can use the proportion between the sculpture's weight and the tension in the wire as follows:

T = Mg

where g: gravity.

Next, we can use the equation for the frequency of a vibrating wire to solve for the tension T:

\(f = (1/2L) \sqrt{(T/μ)}\)

Solving for T:

\(T = 4π²μL²f²\)

Substituting:

T = 5.5 N

Utilize equation for the tension in the wire to solve for the mass of the sculpture:

M = T/g

Substituting:

M = 0.56 kg

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5.48 V is the potential drop across the cable for a copper transmission cable of 50.0 km long and 10.0 cm in diameter carries a current of 105 A

Ohm's Law states that the potential drop is determined by the equation: V = IR, where I is the current and R is the wire resistance.
R=PL/A
Under the assumption that all physical parameters and temperatures remain constant, Ohm's law asserts that the voltage across a conductor is directly proportional to the current flowing through it.

Only when the given temperature and the other physical variables remain constant does Ohm's law apply. Increasing the current causes the temperature to rise in some components. The filament of a light bulb serves as an illustration of this, where the temperature increases as the current increases. Ohm's law cannot be applied in this situation. The filament of the lightbulb defies Ohm's Law.

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At maximum height, velocity is zero and kinetic energy will be zero.

K.E(A) = 0

P.E(A) = mgh = 200 x 9.8 x 30 = 58,800 J

K.E(B) = P.E(A) - P.E(B)

K.E(B) = 58,800 J - (200 x 9.8 x 25)

K.E(B) = 58,800 J - 49,000 J

K.E(B) = 9,800 J

K.E = ¹/₂mv²

v² = 2K.E/m

v² = (2 x 9800)/(200)

v² = 98

v = √98

v = 9.9 m/s

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Please complete your question and then send

Answer:

0.012 J

Explanation:

We are given:

q = 0.0080C

Potential difference =  1.5V

W=qV

Substituting the values into the equation:

W=0.0080*1.5= 0.012J

Answer:

5g/cm

Explanation:

denisty=mass/volume

100/20

5g/cm

Answer:

There is net loss of gravitational energy .

Explanation:

When Xanaxa is on the ground , her potential energy is assumed to be zero . When she leaps to a height of 153 m , she gains gravitational energy . When she dives and reaches the surface , she loses potential energy and on reaching the ground her potential energy becomes zero . When she further goes down inside ground to a depth of 17.5 m , she loses potential energy further . Her potential energy becomes less than zero or negative .

Ultimately her potential energy changes from zero to negative in the whole process . So there is net loss of potential energy .

Answer:

600 J

Explanation:

900 j = 300j = 600 j lost due to friction

Energy lost due to friction is 600 J.

The kinetic energy before and after friction is given as 900J and 300J.

   The force that resists the sliding or rolling over one object with another is called friction. The energy which possess in virtue of being in motion is said to be Kinetic Energy.

                                   f = μN

                      Energy lost = 900J - 300J

                                          =  600J

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Answer:

Explanation:

In a series connected electrical circuit as also seen in all electrical Circuit the switch allows the flow of Electricity through out the circuit therefore causing the lighting of bulbs and also other electrical appliances to receive electricity.

When the switch is Open the flow of electricity in the circuit is disrupted while when the Switch is closed it allows the flow of electricity seamlessly through out the circuit. there are different types of switches but the most important is the MAIN SWITCH  because it is used to shutoff electricity completely from the entire circuit during emergencies or repairs.

Answer:

Current cannot flow through a circuit when the switch is OPEN

Current flows through a circuit and all of the bulbs are lit only when the switch is CLOSED

Explanation:

Answer:

Below

Explanation:
since I’m in biology, here are he exact steps from my textbook:

The Scientific Method:

A scientific method is a series of steps for investigating questions and testing ideas. There are several versions of the scientific method, but all versions are based on rational thinking, inquiry, and experimentation. The scientific method includes five main steps. Review the steps of the overall system before diving into each one.

1. Ask a Question:

The purpose of a scientific investigation is what you are trying to find out or the question you are trying to answer. An empirical observation (e.g., the sky is blue) will prompt an appropriate question (e.g., why is the sky blue?).

2. Do Background Research:

You have learned that science is a body of knowledge. It is important that you research what other scientists have already observed and discovered. Previous investigations into your topic may lead you to new questions that need answers. If the farmer wishes to know why his plants are dying, he would research reasons why that type of plant might not grow. The farmer might conduct this research at the library or a local garden center or on the Internet.

3. Form a Hypothesis:

A hypothesis is an explanation for a specific observation, phenomenon, or scientific problem that is based on scientific knowledge and can be tested by further investigation. After researching what other scientists already know, the farmer will need to form a hypothesis about what he thinks will happen. Forming a hypothesis involves an understanding of current scientific knowledge and creativity to look at the problem or question in a way that will lead to the predicted outcome. For instance, the farmer notices that the dying plants seem to be yellow and brown, so he could conclude that there are not enough nutrients in the soil. He would form the hypothesis, ”The lack of nutrients in the soil is causing the plants to die.”

4. Test with an Experiment:

An experiment allows you to test your hypothesis to determine if it is a correct or incorrect prediction of the outcome. There are many ways to test a hypothesis, but every experiment should have at least one variable that changes while the others stay the same or are controlled. This allows the experimenter to determine if a selected change will affect a specific factor in the way their hypothesis predicts. The farmer would then design and carry out a test to try to get an answer to the original question and observation. The farmer would record the data on a data sheet. He would also want to write down the steps he used to carry out his experiment in case it needs to be repeated. This is called the procedure. The farmer would make sure his procedure and data are accurately reported, so that he could share the information with others or repeat the procedure at a later time.

5. Analyze Data:

The analysis of data from an experiment compares known and unknown values in the data. The experiments are always repeated several times to make sure the results are valid. When an experiment is valid, it means that the results are consistent over time and reproducible by you or by another scientist, following the same procedure. Based on the results of the farmer’s experiment, he would analyze the data by creating charts or graphs of the growth of the plants over time.

6. Draw Conclusions:

Based on the analysis of the collected data, a scientist will refer back to the hypothesis and ask: Was the hypothesis correct or incorrect? Sometimes this is very simple and the conclusion is obvious. On occasion, finding that the hypothesis is incorrect will lead to new discoveries. Sometimes, the results are inconclusive, and the scientist must design a new experiment or complete further research. If the farmer finds that the data supports the original hypothesis, he may conclude that the lack of soil nutrients caused the plants to poorly grow (i.e., analysis shows that changing the amount of nutrient causes the plants to grow faster). On the other hand, the data might not support the original hypothesis (i.e., analysis shows that changing the amount of nutrient does not keep the plants from dying). In this case, he would try to change a different variable in the experiment, such as the amount of water, in order to retest his hypothesis.

The given statement about “Nuclear energy is a clean energy source with virtually no greenhouse gas emissions.” is true, because Nuclear is a zero-emission clean energy source.

Fission is the process by which atoms of uranium are separated to release energy, and this is how nuclear power plants produce electricity. Electricity is produced without the emission of hazardous pollutants often associated with the combustion of fossil fuels by using the heat released by fission to create steam that turns a turbine. The Nuclear Energy Institute (NEI) estimates that in 2020 the United States will have prevented the release of about 471 million metric tons of carbon dioxide. That's more than all other forms of clean energy put together, and it's the same as taking 100 million cars off the road. In addition to preventing acid rain, pollution, lung cancer, and cardiovascular illness, it also cleans the air by thousands of tons annually.

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Scientific theories are the results of many experiments over a long period of time.

Scientific theories are explanations that have been developed through extensive experimentation and observation over a period of time. They are supported by a large body of evidence from multiple sources and have been subjected to rigorous testing and scrutiny by the scientific community. Scientific theories are not based on a single experiment but rather on a vast accumulation of knowledge and data. They provide a framework for understanding the natural world and can help predict future observations and experiments. Scientific theories are also subject to change or revision if new evidence is discovered that contradicts or expands upon the existing theory. The development of scientific theories is a collaborative effort among scientists from different disciplines, and the peer-review process is used to ensure that scientific theories are reliable and accurate representations of reality. Scientific theories have been used to make significant advancements in fields such as medicine, engineering, and physics, and they continue to play a critical role in advancing our understanding of the world.

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The work and energy theorem allows finding the result for where the kinetic energy of the car is before stopping is:

    The energy becomes:

Work is defined by the scalar product of force and displacement.

          W = F . d

Where the bold indicate vectors, W is work, F is force and d is displacement.

The work energy theorem relates work and kinetic energy.

            W = ΔK = \(K_f - K_o\)

In this case the vehicle stops therefore its final kinetic energy is zero, consequently the work is:  

          W = - K₀

Therefore, the initial kinetic energy that the car has is converted into work in its brakes.  In reality, if assuming that there is friction, an important part is transformed into non-conservative work of the friction force, this work can be seen in a significant increase in the temperature of the discs on which the work is carried out.

In conclusion, using the work-energy theorem we can find the result for where the kinetic energy of the car is before stopping is:

    The energy becomes:

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The current in the circuit when the voltage across the resistor is equal to the voltage across the inductor is given by:

i(t) = [V_B / R] (1 - e^(-Rt/L)) where t is the time after the switch is closed.

The series circuit in the figure contains an ideal battery with a constant terminal voltage V_B=52 V, an ideal inductor L=42 H, a R=20-ohm resistor, and a switch S. Initially, the switch is open, and there is no current in the inductor. At time t=0 s, the switch is suddenly closed. What is the current in the circuit when the voltage across the resistor is equal to the voltage across the inductor-If the voltage across the resistor and the voltage across the inductor are equal, then the voltage across the inductor is V = IR, where I is the current in the circuit.

According to Kirchhoff's law, the voltage across the resistor is equal to the voltage of the battery minus the voltage across the inductor, i.e., V = V_B - L (di / dt), where di/dt is the rate of change of current, and L is the inductance of the inductor. Equating these two expressions for V, we have: IR = V_B - L (di / dt). Rearranging this equation gives us the following differential equation:di / dt + (R/L) i = (V_B / L)The solution of this differential equation is given by: i(t) = [V_B / R] (1 - e^(-Rt/L)).

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Answer:

If gravity were stronger, houses and buildings would have to be more sturdy so they do not get crushed to the ground. If gravity were weaker, buildings and houses would have to be built stronger so they do not float away.

Hope this helps you!

Answer:

given

Explanation:

power input is 80 kw and power output is asking also efficiency is given so

efficiency= power output / power input

use to get heat transfer rate which is power

Answer:

E = h f - h f0    

E is the energy of the emitted photon - h f is the energy in an incident photon of frequency f

h f0 is the energy required to remove an electron from the metal being considered

If h f is not equal to or greater than h f0 then no photons will be emitted.

Answer:

3*10^8 ÷ 475*10^-9

= 6.3 x 10^14