greenhouse gases transmit visible light, allowing it to heat the surface, but then absorb infrared light from the earth's surface, trapping the heat near the surface. true or false

Solar cells make economic sense for a homeowner as they convert sunlight directly into electricity, which can be used to power homes and reduce electricity bills.

Solar cells are a popular choice for homeowners looking to adopt solar technology because they offer a direct way to generate electricity from sunlight.

The energy generated by solar cells can be used to power homes and businesses, which reduces the demand for electricity from traditional sources like fossil fuels.

As the cost of solar cells has decreased in recent years, they have become increasingly accessible and cost-effective for homeowners. Additionally, many governments and utilities offer incentives for homeowners to install solar cells, further reducing the overall cost.

Other solar technologies, like water heating and power towers, may also be beneficial in certain situations but may not be as widely applicable or cost-effective as solar cells.

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the answer is:

d. the spanish and american indian tribes enjoyed exclusively friendly relations.

Answer:

b. the spanish and american indian tribes enjoyed exclusively friendly relations.

Explanation:

Answer:

Work done by the shopper on the cart: The force of 40 N at an angle of 30 degrees downward from the horizontal can be resolved into its horizontal and vertical components. The horizontal component of the force is:F_horizontal = F * cos(theta) = 40 N * cos(30) = 34.64 N

The work done by the shopper on the cart is equal to the force applied multiplied by the distance moved, multiplied by the cosine of the angle between the force and the displacement. In this case, the displacement is 15 m, and the angle between the force and the displacement is 30 degrees. Therefore:Work = F * d * cos(theta) = 34.64 N * 15 m * cos(30) = 448.5 J

Speed of the cart at the tofu section: The initial potential energy of the cart and shopper is equal to their combined mass (85 kg) multiplied by the acceleration due to gravity (9.81 m/s^2) multiplied by the height of Twin Peaks (600 m). 

Therefore: Potential energy = m * g * h = 85 kg * 9.81 m/s^2 * 600 m = 498,690 J

Since the shopper neglects friction, all of the potential energy is converted into kinetic energy at the bottom of the hill. The kinetic energy of the cart and shopper can be found using the formula:

Kinetic energy = 0.5 * m * v^2

where m is the mass of the cart and shopper, and v is their speed.

Therefore:Kinetic energy = 0.5 * 85 kg * v^2 Since the potential and kinetic energies are equal, we can set them equal to each other and solve for the speed v: Potential energy = Kinetic energym * g * h = 0.5 * m * v^2v = sqrt(2 * g * h) = sqrt(2 * 9.81 m/s^2 * 600 m) = 109.43 m/s

Power exerted by the shopper in stopping the cart:The shopper brings the cart to rest over a distance of 15 m in a time of 2.7 s. The average force exerted by the shopper on the cart can be found using Newton's second law: F = m * a = m * (v_f - v_i) / twhere m is the mass of the cart, v_i is the initial speed of the cart (which is zero), v_f is the final speed of the cart, and t is the time taken to stop the cart. Solving for F gives:F = m * (v_f / t)The work done by the shopper in stopping the cart is equal to the force applied multiplied by the distance moved, which is 15 m. Therefore:Work = F * d = m * (v_f / t) * d = 24 kg * (0 - 0) / 2.7 s * 15 m = 0 JSince no work is done in bringing the cart to rest, the power exerted by the shopper is zero.Acceleration due to gravity on the unknown planet:The final speed of the 4 kg ball is 12 m/s, and it falls a distance of 60 m. The initial speed is zero, so the final velocity is equal to the velocity acquired due to gravity. The final velocity can be found using the formula:v_f^2 = v_i^2 + 2 * g * hwhere v_i is the initial velocity (which is zero), h is the height fallen, and g is the acceleration due to gravity.

Answer:

25 J

Explanation:

m = 2 kg

v = 5 m/s

\(K.E_{snowball} = \frac{1}{2} m {v}^{2} \\ \\ = \frac{1}{2} \times 2 \times {(5)}^{2} \\ \\ = 25 \: Joule\)

The present value of the following single amounts are as follows;

PV for FV = $20,000, I =7%, N =10 years is $10,155.84

PV for FV = $14,000, I =8%, N =12 years is $4,489.92

PV for FV = $25,000, I =12%, N =20 years is $2,590.11

PV for FV = $40,000, I =10%, N =8 years is $18,520.89.

Future value (FV) =$20,000,

Interest rate (I) =7%,Time (n) = 10 years

The present value (PV) can be calculated as follows;

PV = FV / (1 + i)n = 20000 / (1 + 0.07)10PV = 20000 / 1.96715PV = $10,155.84

Future value (FV) =$14,000,

Interest rate (I) =8%,

Time (n) = 12 years

The present value (PV) can be calculated as follows;

PV = FV / (1 + i)n = 14000 / (1 + 0.08)12PV = 14000 / 3.12159PV = $4,489.92

Future value (FV) =$25,000,

Interest rate (I) =12%,Time (n) = 20 years

The present value (PV) can be calculated as follows;

PV = FV / (1 + i)n = 25000 / (1 + 0.12)20PV = 25000 / 9.64632PV = $2,590.11

Future value (FV) =$40,000,Interest rate (I) =10%,Time (n) = 8 years

The present value (PV) can be calculated as follows;

PV = FV / (1 + i)n = 40000 / (1 + 0.1)8PV = 40000 / 2.15893PV = $18,520.89

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The height of the cliff is 8.7 meters while 65kg mass falls off a cliff and hits the ground with the velocity of 18.25m/s.

Velocity is a measure of an object's speed and direction of motion. It is a vector quantity, meaning it has both magnitude (speed) and direction. Velocity is often represented by the symbol "v" and is usually measured in meters per second (m/s). The velocity of an object can be changed by applying a force to it, causing it to accelerate. The acceleration can be positive, negative, or zero, depending on the direction and magnitude of the force.

Calculation for finding height of the cliff

The equation of motion to find the height of the cliff

\(h = vi \times t + 1/2 \times a \times t^2\)

where h is the height of the cliff, vi is the initial velocity (which is 0 m/s because the object is starting from rest), t is the time it takes to fall, and a is acceleration due to gravity \((9.8 m/s^2)\).  Final velocity of the object \((18.25 m/s)\) to find t should be used.

\(vf^2 = vi^2 + 2\times a \times h\)

\(18.25^2 = 0 + 2 \times9.8 \times h\)

Hence,

\(h = (18.25^2) / (2 \times9.8) = 170.5625 m/s^2 / 19.6 m/s^2 = 8.7 meters\)

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The voltage of the circuit is 13 - 8j volts.

The circuit has a current of 5 + j^3 amps, which can be written as 5 + 3j + j^2.

The resistance is 3 - j^2 ohms, which can be written as 3 - 2j + j^2. The voltage of the circuit is calculated by multiplying the current by the resistance.

In this case, the voltage is 5 * 3 - 5j + 3j^2 - 2j^3 + j^4.

The imaginary unit j is defined as the square root of -1.

This means that j^2 = -1 and j^3 = -j.

Substituting these values into the expression for the voltage, we get 15 - 7j + j^2 - j^3 + j^4.

Simplifying the expression, we get 15 - 7j + 1 - j - 1 = 13 - 8j.

Therefore, the voltage of the circuit is 13 - 8j volts.

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With the given information on Marcia who is an electrical engineer who is testing the voltage of a circuit, the voltage of the circuit is 12 - 7j volts.

The voltage of the circuit is given as

voltage = (current) x (resistance)

First, multiply the complex current and resistance values together using the distributive law and the fact that the square of the imaginary unit j is -1.

(current) x (resistance) = (5+j3) x (3-j2)

= 5 x 3 + 5 x (-j2) + j3 x 3 + j3 x (-j2)

= 15 - j10 + 3j - 3

Simplify this expression, we get:

(5+j3) x (3-j2) = 12 - 7j

Plug this value into the voltage formula

voltage = (current) x (resistance) = (12 - 7j) volts

Therefore, the voltage of the circuit is 12 - 7j volts.

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Question is incomplete, find the complete question below

Marcia is an electrical engineer who is testing the voltage of a circuit given a certain current and resistance. She uses the following formula to calculate voltage: voltage = (current) (resistance) The circuit she tests has a current of5+j3 amps and a resistance of3-j2 ohms. What is the voltage of the circuit? 0 1 1 +Jl volts 0 21 +.l volts 0 21 'Jl volts 0 11—.lvolts

Many meters will a particle have traveled after t seconds if it is moving in a straight line at a velocity of v(t)=t2e2t meters per second?

In contrast to velocity, which describes the speed and direction of such an object's movement, speed is the rate of movement along a path. Alternatively, velocities is a vector while speed is just a scalar quantity.

Velocity (v), which can be expressed by the expression v = s/t, is still a tensor quantity that determines dislocation (or the shift in position, s), over change in time (t).

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The image as shown here can here can be used to describe charging by induction.

A charge may be positive or negative. One of the methods of transferring a charge is by induction.

In this case, an objects induces an opposite charge on a material.  The image as shown here can here can be used to describe charging by induction.

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Answer:

friction

Explanation:

Answer:Physical

Explanation:

Answer:

physical change

Explanation:

Making a fruit salad, with raw fruits is considered as physical change because in this process chemical composition of fruits is not changed. It is simply changing the shape of the substance.

Answer:

Formula: Fe2O3

because

Fe3+ O-2 is not a compounded

Explanation:

The unit of work done is in Joules

Work done is a physical quantity that is defined as the force applied to move a body through a particular distance.

Work is only done when the force applied moves a body through a distance.

    Work done  = Force x distance

The maximum work is done when the force is parallel to the distance direction.

The minimum work is done when the force is at an angle of 90° to the distance direction.

 So to solve this problem;

 multiply the force applied by Zack and distance through which the bull was pulled.

Answer:

1350 meters

Explanation:

this is easy

15 meters per second

90 seconds

90 * 15 = 1350

Answer:

b.

Explanation: I do not know much about this but the answer that i think it is was b.

A rock turns a reddish color when exposed to air and water. this description is evidence of chemical weathering

Chemical weathering is demonstrated by the fact that "a rock turns a reddish colour when exposed to air and water." The breakdown of rocks occurs through a process known as chemical weathering, which involves chemical interactions with elements including water, oxygen, and acids. The iron in the rock may have oxidised, which is when iron in the rock combines with oxygen and water to generate iron oxide (rust), giving the material its reddish hue. The physical weathering produced by wind-borne particles is described in Option A, the physical weathering induced by freeze-thaw cycles is described in Option B, and the physical weathering caused by gravity and the impact of the rock striking the ground is described in Option D.

Hence option C is correct.

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Answer:

340 kg/m³

Explanation:

\(Relative density \: = \frac{density \: ofsubstance}{density \: of \: equal \: volume \: ofwater} \)

density of water = 1000 kg/m³

density of the liquid = 0.34 × 1000

= 340 kg/m³

Charged particles are fundamental to the behavior of electric currents, electric circuits, and resistance. An electric current is the flow of charged particles, typically electrons, through a conductor.

The flow of charged particles generates an electric field that induces a potential difference, or voltage, across the conductor.Electric circuits are constructed by connecting conductors and electrical components, such as resistors, capacitors, and inductors, in a specific configuration. The arrangement of the components determines how the current flows through the circuit.

The flow of current through the circuit depends on the resistance offered by the components in the circuit and the potential difference across the circuit.Resistance is the property of a conductor that opposes the flow of current. The resistance of a conductor is proportional to the number of charged particles in the conductor, the length of the conductor, and the cross-sectional area of the conductor. The resistance can also be affected by the temperature of the conductor and its material properties.

In summary, charged particles are responsible for generating electric currents that flow through electrical circuits. The behavior of the currents is determined by the arrangement of the components in the circuit and the resistance offered by the conductors and components. Resistance is a fundamental property of a conductor that opposes the flow of charged particles and can be affected by various factors.

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(a) Your weight in Newtons is 560.7 N.

(b)  Your mass in kilograms is 57.12 kg.

(c) Your weight on the moon is 93.45 N.

a) To convert your weight from pounds to Newtons, we can use the conversion factor that 1 pound is equal to 4.45 Newtons.

Therefore, your weight in Newtons would be:

126 pounds x 4.45 Newtons/pound = 560.7 Newtons

b) To find your mass in kilograms, we can use the formula:

mass (kg) = weight (N) / acceleration due to gravity (m/s²)

The acceleration due to gravity on Earth is approximately 9.81 m/s². Therefore, your mass in kilograms would be:

mass (kg) = 560.7 N / 9.81 m/s² = 57.12 kg

c) The gravitational force between two objects depends on their masses and the distance between them. The gravitational force on the moon is about 1/6th the gravitational force on Earth.

Therefore, if you went to the moon, your weight would be about 1/6th of what it is on Earth.

Your weight on the moon would be:

126 pounds / 6 = 21 pounds

To convert this to Newtons, we can use the conversion factor:

1 pound = 4.45 Newtons

So your weight on the moon in Newtons would be:

21 pounds x 4.45 Newtons/pound = 93.45 Newtons

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Answer:

⁸

Explanation:

electric potential

I think so

Balanced force does a window washer want acting on him when trying to keep the same position.

What is force?
Force is an external influence that is capable of changing the motion of a body, either by a push or pull, or by causing a change in the shape or direction of the body. Force is a vector quantity, meaning it has both magnitude and direction. It can be a result of either physical contact, like pushing or pulling, or a non-contact force, such as gravity, magnetism, or electricity. Force is a fundamental concept in physics and its effects are studied in numerous fields, from mechanics to thermodynamics. Force can be used to move objects, cause objects to change shape, or cause objects to accelerate. It is a powerful tool for understanding physical phenomena.

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Since the motor develops a 100 V back emf (electromotive force) at its normal operating speed, its current is 1.67 A.

The relation between current (I), voltage(V), and resistor (R) in a direct current circuit is:

V = I . R

At start:

V = 120 V

I = 10 A

Hence, we can find the equivalent resistor:

R = V/ I = 120 / 10 = 12 Ohm

When the motor is running, it develops 100 V back emf.

Therefore, the net voltage is

= 120 V - 100 V = 20 V

and hence, the current:

I = 20 / 12 = 1.67 A

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Answer:

At point 1, the girl is gaining is gaining velocity towards due to gravity and the swing. At point 2, the girl has no gravity pulling her down. At point 3, the girl depends on her forward velocity gained from the gravity to move forward. At point 4, the girl exhausts its forward velocity and she goes back due to gravity/

point 2-1 and 2-4: Amplitudo

point 2-3: deviation

point 2: equilibrium

point 1 and 4: PE max, KE=0, EM=PE

point 2: KE max, PE=0, EM=KE

Answer:

Sleep Apnea

Explanation:

I believe it is Sleep Apnea due to one of the "symptoms" of it being, "Observed episodes of stopped breathing during sleep".

familydoctor.org also says that, "People who have sleep apnea stop breathing for 10 to 30 seconds at a time while they are sleeping. These short stops in breathing can happen up to 400 times every night."

False. Electric field lines cannot cross each other, regardless of whether the charges involved are positive or negative.
The electric field lines are a visual representation of the electric field created by charges. They indicate the direction and strength of the electric field at various points.

These lines originate from positive charges and terminate at negative charges, following the direction that a positive test charge would experience forces in the field.

The reason that electric field lines cannot cross is that at the point of intersection, there would be two different values for the electric field direction, which is not possible. The electric field has a unique direction at every point in space. If lines crossed, it would imply that a test charge at the crossing point would experience two different forces in different directions simultaneously, which is contradictory to the nature of electric fields.

In summary, electric field lines cannot cross each other, regardless of whether positive or negative charges are involved. This is because the electric field has a unique direction at every point, and crossing lines would result in contradictory information about the electric field's direction and strength.

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Given :

A motorcycle weighing 7300 N is parked on an 8.2 degree slope.

To Find :

The magnitude of the acceleration at which the motorcycle will roll downhill if its brake is released.

Solution :

We know, the acceleration due to gravity in the motorcycle is :

g = 9.8 m/s²

Now, component of acceleration along the slope is given by :

\(g'= g \times sin \ 8.2^o\\\\g'= 9.8 \times sin \ 8.2^o\\\\g' = 9.8 \times 0.143\\\\g'= 1.40\ m/s^2\)

Therefore, the magnitude of the acceleration at which the motorcycle will roll downhill if its brake is released .

According to the Skygazer's Almanac for 2022 at 40 degrees, Venus and Saturn will be in opposite parts of the sky on December 17, 2022.

The Skygazer's Almanac provides astronomical information for a specific location and year. In this case, at a latitude of 40 degrees, the almanac indicates that Venus and Saturn will be in opposite parts of the sky on December 17, 2022. This means that Venus and Saturn will appear at opposite sides of the celestial sphere as observed from Earth. However, it's important to note that the almanac's predictions are approximate and can be influenced by various factors, including atmospheric conditions and the observer's specific location. To obtain the most accurate and up-to-date information, it is recommended to consult more recent astronomical sources or use specialized software that can provide precise positions and dates for celestial events.

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Answer:

brush

Explanation:

its correct

Answer:

B. Brush

Explanation:

Edg 2021

Answer:

Boyle's law, Charles's law, and Avogadro's law

Explanation:

Option D from the following is the solution concentration expressed in terms of mortality because it represents the number of moles dissolved in a liter of the solution.

A chemical compound is a combination of two or more either similar or dissimilar chemical elements.

The molarity of a solution is expressed in terms of the number of moles dissolved per liter of the solution.

The number of moles dissolved in a liter of the solution, represented by option D from the following, is the solution concentration stated in terms of mortality.

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This statement is True. If e is the edge of the minimum weight in the graph, then it must be included in any minimum spanning tree (MST) of the graph.

This is because an MST is a tree that spans all the vertices of the graph with the minimum total weight, and removing any edge from it would result in a disconnected graph or a tree with a higher weight. Therefore, since e is the edge of minimum weight, it must be part of some MST.
 

Explanation:
1. Start with an empty MST.
2. Select the edge 'e' of minimum weight from the given graph G.
3. Add this edge 'e' to the MST.
4. Continue adding the next minimum weight edges to the MST while ensuring that no cycles are formed.
5. Repeat the process until the MST includes all the vertices from graph G.

Since the edge 'e' is of minimum weight in G, it will be included in the MST during the construction process, ensuring that the final MST is also of minimum weight.

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Answer:

D hope this helps plz mark brainliest

Explanation: