Help need asap need 13 and 14

Answer: 317.52

Explanation:

I'm just better

The mathematical relationship between m₁ and m₂ is that m₁ is twice the value of m₂.

Length of the femur, L = 0.9 m

Mass of the femur, M = 10 kg

Centre of gravity = L/3

m₁ + m₂ = M

T₁ + T₂ = Mg

m₁g + m₂g = Mg

T₁ + T₂ = m₁g + m₂g

T₁(L/3) = T₂(2L/3)

m₁g(L/3) = 2m₂mg(L/3)

Therefore,

m₁ = 2m₂

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friction

Friction is what causes moving objects to slow down and eventually stop.

Situation (a) results in a zero net magnetic field at point P. Option 1 is correct.

In situation (a), the two wires are carrying currents in opposite directions. At point P, the magnetic field due to one wire will be in the opposite direction of the magnetic field due to the other wire. Since the two fields are equal in magnitude and opposite in direction, they cancel each other out, resulting in a net magnetic field of zero at point P.

In situations (b), (c), and (d), the currents are either in the same direction or the wires are at different distances from point P. In these situations, the magnetic fields due to the wires do not cancel each other out at point P, resulting in a nonzero net magnetic field. Therefore, only situation (a) gives rise to a zero net magnetic field at point P. Option 1 is correct.

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Answer:

Rainbows form in the sky when sunlight is refracted, or bent, as it enters a raindrop. This bending causes the different colors in the light to separate and spread out, forming the characteristic arc of a rainbow. The colors are arranged in a specific order, with red on the outer edge of the arc and violet on the inner edge. The colors are also more vivid when the sun is lower in the sky, such as during sunrise or sunset, because the light has to travel through more of the Earth's atmosphere to reach your eyes.

Answer:

0.04 Hz

Explanation:

The formula for calculating frequency is f = 1/T, and T = the period of the wave. If the wave period is 25 seconds then the formula would be f = 1/25. 1/25 =0.04

Answer: Less than 1% of the stars that Kepler will be looking at are closer than 600 light years. Stars farther than 3,000 light years are too faint for Kepler to observe the transits needed to detect Earth-size planets.

Explanation:

In a non-uniform electric field, an electric dipole experiences both a torque and a net force.

In a non-uniform electric field, the electric field lines are not parallel nor are they evenly spaced out. What this translates to is different parts of an electric dipole experience uneven magnitudes and directions of the electric field.

An electric dipole is a pair of opposite charges separated by a distance, which creates a dipole moment.

When there is a non-uniform electric field, the charges in the dipole have different forces in opposite directions.

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a) To determine if the car will hit the object before coming to a stop, we need to calculate the distance required to stop the car, assuming maximum braking deceleration. We can use the following formula:

d = (v^2) / (2a)

where:

d = distance required to stop

v = initial velocity

a = acceleration/deceleration

In this case, v = 100 km/h = 27.78 m/s (converted from km/h to m/s)

a = -7 m/s^2 (negative sign indicates deceleration)

We know that the car's headlights extend out to a range of 30 m, so if the distance required to stop the car is greater than 30 m, the car will hit the object before coming to a stop.

Plugging in the values to the formula, we get:

d = (27.78^2) / (2 x -7) = 108.61 m

Since 108.61 m is greater than 30 m, the car will hit the object before coming to a stop.

b) To calculate the time required to stop, we can use the following formula:

t = v / a

where:

t = time required to stop

v = initial velocity

a = acceleration/deceleration

Plugging in the values, we get:

t = 27.78 / 7 = 3.97 s

Therefore, it will take 3.97 seconds to stop the car.

The kinetic energy of the racing car is approximately 849952.4 J joules.

Kinetic energy is simply a form of energy a particle or object possesses due to its motion.

It is expressed as;

K = (1/2)mv²

Where m is mass of the object and v is its velocity.

Convert the speed from kilometers per hour to meters per second since the units of mass and velocity need to be consistent.

We know that 1 km/h = 0.27777 m/s, so:

120 km/h x (0.27777 m/s/km/h) = 33.3336 m/s (rounded to 4 decimal places)

Now we can substitute the values into the formula:

Kinetic Energy = (1/2) × 1530 kg x (33.3336 m/s)²

Kinetic Energy = 849952.4 J

Therefore, the kinetic energy is approximately 849952.4 joules.

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The time taken by the water to freeze and the temperature falls below 0°C is approximately 2940 s.

When the liquid(water) is changed to solid (ice), this process is called melting. The freezing point is a point at which the liquid changes into a liquid. The freezing point of water is 0°C.

From the given,

time taken by the water to freeze below 0°C in the graph (ie: -10°C and -20°C ) = 49 minutes.

1 minute = 60 seconds

49 min = 49×60 seconds = 2940 seconds.

The time taken (t₂) by the water to freeze below 0°C  is 2940 seconds.

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If the light goes through a single slit, the pattern that will appear on the target screen is: "A large bright band will appear directly across from the slit, that gets dimmer farther away from the center." The correct option is option A.

When light passes through a single slit, it diffracts and spreads out. This means that the light waves bend and interfere with each other as they pass through the slit, creating a pattern of bright and dark fringes on a screen behind the slit.

The central fringe is bright, with the maximum intensity of the light, and is surrounded by smaller and dimmer fringes on either side. These fringes are the result of constructive and destructive interference between the light waves passing through the slit.

The width of the slit plays an important role in determining the pattern of the fringes. If the slit is narrow, the diffraction of light will be more pronounced, resulting in a wider central fringe and smaller, more numerous side fringes. If the slit is wider, the central fringe will be narrower and the side fringes will be wider.

The distance between the slit and the screen also affects the pattern of the fringes. The closer the screen is to the slit, the wider the fringes will be, and the farther away the screen is from the slit, the narrower the fringes will be.

The diffraction of light through a single slit is an important phenomenon in physics and is used in various applications such as optical spectroscopy and the study of crystal structures.

Option B, "Two large bright bands will appear on the target screen, with less bright bands in between them," is incorrect. This pattern is actually the interference pattern that occurs when light passes through two parallel slits. When light passes through a single slit, the pattern is a central bright band with smaller, dimmer bands on either side.

Option C, "Two large bright bands appear very distant from each other on the target with nothing but dark bands in between them," is also incorrect. This pattern is the interference pattern that occurs when light passes through multiple slits, such as in a diffraction grating. When light passes through a single slit, the pattern is a central bright band with smaller, dimmer bands on either side.

Therefore, The correct answer is option A.

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The connection of the circuit is shown in the image attached here.

When we heat that a connection is done in parallel our minds would have to go to a connection that is made to common junction. The implication of this is that there are wires that would come out from each of the cells and that the wires would be joined at a common point.

Many different applications, including electric automobiles where many batteries may be connected in parallel to enhance the range and power output of the vehicle, can benefit from the parallel connection of cells.

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The gravitational force acting on the 83.4-kg person due to the 65.6-kg person is approximately 3.14 x 10^-8 N.  

The gravitational force is an attraction between any two mass-containing objects.

The following formula determines the gravitational force between two objects:

F = G * (m1 * m2) / r2.

where

Plugging in the given values, we have:

F = (6.67 x 10^-11 N * m^2 / kg^2) * (83.4 kg) * (65.6 kg) / (1.21 m)^2

F = 3.14 x 10^-8 N

Therefore, the gravitational force acting on the 83.4-kg person due to the 65.6-kg person is approximately 3.14 x 10^-8 N.

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High tides occur when the sun and moon are at right angles to one another. This is because the gravitational pull of the moon and the sun combine to create larger-than-normal tides, known as spring tides. The correct option is A.

Gravitational pull is the force of attraction that exists between two objects with mass. The greater the mass of an object, the greater its gravitational pull.

Option B, "Low tides occur when the sun and moon are at right angles to one another," is incorrect. Low tides occur when the sun and moon are at a 90-degree angle (or "quarter moon") to each other, but this position also results in high tides on the opposite side of the Earth.

Option C, "The gravitational pull of the sun and moon combined creates larger than normal tides," is partially correct. The gravitational pull of both the sun and moon does contribute to the tides, but the specific position depicted in the image (sun and moon at right angles to each other) does not necessarily create larger than normal tides.

Option D, "The gravitational pull of the sun reduces the moon's gravitational pull to create moderate tides," is also incorrect. The sun's gravitational pull does have an effect on the tides, but it does not reduce the moon's gravitational pull. Rather, the combined gravitational pull of the sun and moon creates the tides we observe.

Therefore,The accurate description of the tide represented by the image below is option A: "High tides occur when the sun and moon are at right angles to one another."

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Answer:100

Explanation:

Answer: 317.52

Explanation:

I'm just him, so I just know

Spinning a magnet near a wire would generate a current.

The circuit must make a complete loop and must have all parts connected to that loop.

When a magnet approaches a conductor, such as a wire, the magnetic field changes, causing the wire to conduct electricity. Electromagnetic induction is a process that underlies the operation of electric motors and generators.

Electromagnetic induction and is the basis for how generators and electric motors work and it explains the fact that current is generated by a spinning a magnet near a wire.

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The force you applied to the car is balanced since the car does not move.

A force is said to be balanced when the sum of all the forces acting on object is equal to zero.

A force is said to be unbalanced when sum of all the firces acting on object is not equal to zero.

In other words, some of the force applied is greater than others.

So when you want to push a car with a dead battery and you apply 200 N of force, yet the car does not move, we can conclude that all the forces acting on the car are equal since the car is at equilibrium.

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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.

X-ray technology can be used to do Photograph through solid objects. option A

X-ray  technology  includes the utilize of high-energy electromagnetic radiation to make pictures of the interior of objects, counting the human body. X-rays are a sort of electromagnetic radiation with wavelengths shorter than unmistakable light, but longer than gamma beams.

X-ray innovations  includes the use of high-energy electromagnetic radiation to make pictures of the interior of objects, counting the human body. X-rays are a sort of electromagnetic radiation with wavelengths shorter than visible light, but longer than gamma beams.

Lastly, X-ray innovation is utilized in a assortment of other applications, such as air terminal security scanners, which utilize X-rays to form pictures of gear and other objects to distinguish potential dangers.

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Trains with multiple locomotives are often used to address two primary issues related to forces and net forces: the need for additional power to pull a heavy load, and the need to distribute that pulling power more evenly across the length of the train.

A locomotive, also known as a "locomotive engine" or simply a "loco," is a type of railway vehicle that provides the motive power for a train. It is essentially a self-propelled engine that generates the power necessary to move the train along the tracks. Locomotives can be powered by various means, including steam, diesel, or electricity, and they typically feature a large, distinctive shape with a cylindrical body and a smokestack. The locomotive is often considered the most important part of a train, as it is responsible for providing the power and control needed to move the train safely and efficiently along the tracks.

First, trains carrying heavy loads such as coal, ore, or shipping containers require a lot of pulling power to get moving and keep moving at a steady speed. If a single locomotive isn't powerful enough to provide the necessary force to pull the entire train, additional locomotives can be added to increase the pulling power. This is known as "doubling up" or "tripling up" the locomotives, and it allows the train to move heavy loads more efficiently.

Second, adding locomotives to the front and back of a long train helps to distribute the pulling power more evenly across the length of the train. A long train can experience significant resistance or drag, which can slow down the train or even cause it to come to a stop. By adding locomotives at both ends, the pulling force is distributed more evenly throughout the length of the train, reducing the overall drag and making it easier to maintain a steady speed.

Therefore, adding locomotives to a train can help to provide additional power to pull a heavy load and distribute that pulling power more evenly across the length of the train. This allows the train to move more efficiently and maintain a steady speed, ultimately making it more productive and cost-effective for the transportation of goods.

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Answer:

The new length at the new temperature is approximately 35.0812cm.

Explanation:

Let's use the coefficient of linear expansion of lead, which is approximately 0.000029 per degree Celsius.

The change in length can be calculated using the formula:

ΔL = αLΔT

where:

ΔL = change in length

α = coefficient of linear expansion

L = initial length

ΔT = change in temperature

In this case, ΔT = 80°C, L = 35cm and α = 0.000029/°C.

ΔL = (0.000029/°C) x (35cm) x (80°C)

ΔL = 0.0812 cm

Therefore, the change in length is 0.0812 cm.

To find the new length, we add the change in length to the original length:

New length = 35cm + 0.0812cm

New length = 35.0812cm

So

The final volume of the gas is  9.16 × 10⁻³ m³, the work done by the gas is -0.0147 kJ, and the thermal energy transferred is  0.0147 kJ.

We can use the following equations to solve this problem:

Boyle's Law: PV = constant at constant temperature (isothermally)

Work done by a gas: W = -P∆V

Thermal energy transferred: Q = -W (assuming no heat transfer between the gas and its surroundings)

1. Given:

n = 2 mol (number of moles of helium gas)

T = 170 K (initial temperature)

P1 = 0.23 atm (initial pressure)

P2 = 1.78 atm (final pressure)

R = 8.31451 J/K·mol (universal gas constant)

Using Boyle's Law, we can write:

P1V1 = P2V2

V2 = (P1V1) / P2

V1 = (nRT) / P1 (using PV = nRT)

Substituting the given values:

V2 = (0.23 mol/m3 × 2 mol × 8.31451 J/K·mol × 170 K) / 1.78 atm

V2 ≈ 9.16 × 10⁻³ m³

Therefore, the final volume of the gas is approximately 9.16 × 10⁻³ m³.

2. The work done by the gas can be calculated using the equation:

W = -P∆V

Substituting the given values:

W = -(1.78 atm - 0.23 atm) × (9.16 × 10⁻³ m³)

W ≈ -0.0147 kJ

Therefore, the work done by the gas is approximately -0.0147 kJ.

3. The thermal energy transferred can be calculated using the equation:

Q = -W

Substituting the value of W obtained in part 2:

Q = -(-0.0147 kJ)

Q ≈ 0.0147 kJ

So, the thermal energy transferred is approximately 0.0147 kJ.

Hence, The gas has a final volume of 9.16 × 10⁻³ m³, does work of -0.0147 kJ, and transfers thermal energy of 0.0147 kJ.

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The age of the earth is 4.6 billion years old. and scientist used radioactive dating to determine the Earth’s age.

Scientists used radiometric dating to determine Earth's age. Radiometric dating is a technique that uses the decay of radioactive isotopes to determine the age of rocks and other materials. By measuring the ratio of parent isotopes to daughter isotopes, scientists can calculate how long ago a rock or mineral formed. This method has been used to estimate the age of the Earth and other objects in the solar system.

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Answer: billion, radioactive

Explanation:

Answer:

Because the matter in solid objects doesn't move

Explanation:

Logic

(a) The angular momentum of a 20-kg payload experiencing 10 gs in a centrifuge with a radius of 8.8 m is 5,483 kg m^2/s. (b) If the payload loses 10 kg, the new spin rate taking into account no frictional forces present is 7.54 rad/s.

(a) The angular momentum of a rotating object is given by:

L = Iω

where L is the angular momentum, I is the moment of inertia, and ω is the angular velocity.

The moment of inertia for a point mass rotating in a circle is given by:

I = mr^2

where m is the mass of the object and r is the radius of the circle.

To calculate the angular momentum of the 20-kg payload that experiences 10 gs in the centrifuge, we first need to calculate the angular velocity of the payload. The force on the payload is 10 times the force of gravity on Earth, so the net force on the payload is:

F = ma

F = (10 × 9.8 m/s^2) × 20 kg

F = 1960 N

The net force on the payload is the centripetal force, which is given by:

F = mv^2/r

where v is the velocity of the payload.

Rearranging this equation to solve for v:

v = sqrt(Fr/m)

v = sqrt((1960 N) × (8.8 m) / (20 kg))

v = 33.2 m/s

The angular velocity of the payload is:

ω = v/r

ω = 33.2 m/s / 8.8 m

ω = 3.77 rad/s

Finally, we can calculate the angular momentum of the payload:

L = Iω

L = (mr^2)ω

L = (20 kg) × (8.8 m)^2 × 3.77 rad/s

L = 5,483 kg m^2/s

(b) When the payload loses 10 kg, its new moment of inertia becomes:

I' = m'r^2

I' = (10 kg) × (8.8 m)^2

I' = 774.4 kg m^2

Conservation of angular momentum tells us that:

L = Iω = I'ω'

where ω' is the new angular velocity of the payload.

Solving for ω':

ω' = (I/I')ω

ω' = ((20 kg) × (8.8 m)^2 × 3.77 rad/s) / ((10 kg) × (8.8 m)^2)

ω' = 7.54 rad/s

So, the new spin rate of the payload is 7.54 rad/s.

Therefore,(a) For a 20-kg payload experiencing 10 gs in a centrifuge with an 8.8 m radius, the angular momentum is 5,483 kg m^2/s. (b) If the payload's mass reduces by 10 kg without any frictional forces present, the new spin rate is 7.54 rad/s.

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The diameter of the field is 79.62 m and the radius is 39.81 m.

A diameter of a circle is any straight line segment that passes through the center of the circle and whose endpoints lie on the circle.

To calculate the diameter and the radius of the field, we use the formula below.

Formula:

Where:

From the question,

Given:

Substitute these values into equation 1 and solve for D

The radius of the field  = D/2 = 79.62/2 = 39.81 m.

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