A ball is dropped off the roof of a tall building. If the ball reaches the ground in 8 seconds, how tall is the building, in meters? Round to the nearest whole number (a=9.8 m/s2)

The 4.0-m-long seesaw has a 5.0-kg cat and a 2.0-kg bowl of tuna fish at either end. To keep the seesaw balanced, a 4.0 kg cat must stand 1.5m to the left of the pivot.

Given length of seesaw (l) = 4m

Mass of first cat (m1) = 5kg

Mass of tuna fish (m) = 2kg

Mass of second cat (m2) = 4kg

Let the second cat is at a distance to the left of pivot = d

To keep the seesaw balanced we apply net momentum or torque theorem at pivot.

Torque net about pivot = 0

The pivot is situated at middle of seesaw so the distance from first cat to seesaw and from fish to seesaw = 2m

Force acted on first cat (F1) = m1xg = 5x9.8 = 49N

Force acted on second cat (F2) = m2xg = 4x9.8 = 39.2N

Force acted on tuna fish (F3) = mxg = 2x9.8 = 19.6N

Tourque(T) = force x distance (perpendicular)

Tnet= 49X2 - 39.2Xd - 19.6x2 = 0

58.8 = 39.2d

d = 1.5m

Hence the distance from the left of pivot where the second cat to be situated is 1.5m

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The overall resistance in the circuit decreases and the total current increases. The voltage across each resistor remains the same and the total power increases due to increased current flow.

A simple series circuit consists of a single pathway for the flow of electric current, where all components (such as resistors and batteries) are connected in a sequence, end-to-end. In this type of circuit, the total resistance is the sum of the individual resistances. When a second resistor is connected in parallel with the original resistor in the circuit, it creates an additional pathway for the flow of current. This results in a reduction in the total resistance of the circuit since the parallel combination of resistors provides a lower effective resistance than the original resistor alone. As a result, more current flows through the circuit. However, the voltage across both resistors remains the same as the original voltage provided by the battery.

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The following terms should be included in answering the student question below.A small circular loop of wire of area 0.593 m² and carrying current 2.13 amps is placed inside a solenoid having 181 coils of wire and length 0.695 meters. If the maximum torque on the small loop is measured to be 0.00363 newton-meters

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Solar energy is a renewable energy resource that can provide suitable power for the world in general. It is one of the most abundant energy resources on Earth. Amongst the reasons why solar energy is a viable alternative energy are:

The sun is the largest source of free energy you can utilize on this planet. It can provide enough power that can supply the world’s electricity needs for a year.

One of the primary benefits of utilizing solar energy is that it can provide a clean, green source of power. It is a self-sufficient renewable energy source.

Therefore, solar energy is a viable alternative energy source because it is a renewable source of energy.

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Answer:

It has an endless supply

Explanation:

Pearson Connexus 2023.

Unlike a nonrenewable source of energy such as fossil fuels, solar power is a renewable source of energy that will not run out.

Answer:

understand Newton's second law of motion,F is equal to ma where F is the force ,m is the mass of the object,a is acceleration

Answer:

Truth all the way

Explanation:

:) hope this helps

Answer:

Explanation:

Plug

The theoretical angle required to launch the puck so that it goes up the same distance in the y direction as it travels in the x direction is 45 degrees.

To understand why the theoretical angle is 45 degrees, we can consider the motion of the puck on the table. Since the table is a square, the distance traveled in the x direction is equal to the distance traveled in the y direction when the puck reaches the right corner.

When an object is launched at an angle, its horizontal and vertical motions can be treated independently. In this case, the puck's motion in the x direction is determined by its initial velocity and the time it takes to reach the right corner. Similarly, the motion in the y direction is determined by the initial velocity and the time it takes to reach the same height.

For the puck to travel the same distance in the y direction as in the x direction, we need the vertical displacement to be equal to the horizontal displacement. This can be achieved when the angle of launch is 45 degrees.

At this angle, the horizontal and vertical components of the initial velocity are equal. As a result, the puck will travel the same distance in the y direction as it does in the x direction, reaching the right corner of the table.

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The forces on the pole can be reduced to a single force and a single moment at point P.

When analyzing the forces acting on a pole, it is often convenient to simplify the system by reducing the multiple forces and moments to a single force and a single moment. This reduction allows for a more manageable analysis of the pole's equilibrium. In this case, the forces can be simplified to a single force and a single moment at a specific point, which we'll call point P.

By considering the pole as a rigid body, we can apply the principles of statics to determine the resultant force and moment acting on it. The single force represents the net effect of all the external forces acting on the pole, and it is typically applied at the center of mass or at a convenient reference point.

The single moment, on the other hand, takes into account the rotational effect caused by the forces acting on the pole. It is represented by a couple, which consists of two equal and opposite forces that have the same line of action but act in opposite directions. The moment is applied at a specific point, which could be any point on the pole, but for simplification purposes, we refer to it as point P.

By reducing the forces to a single force and a single moment at point P, we can effectively analyze the equilibrium of the pole and determine if it will remain stable or undergo rotational motion.

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The position of the image is 35 cm from the concave mirror, the size of the image is approximately 1.944 cm, and the nature of the image is upright.

To determine the position, size, and nature of the image formed by a spherical mirror, we can use the mirror formula:

1/f = 1/v - 1/u

where:

f is the focal length of the mirror,

u is the object distance (distance of the object from the mirror),

v is the image distance (distance of the image from the mirror).

Given data:

f = -12 cm (negative sign indicates a concave mirror)

u = -36 cm (negative sign indicates that the object is located on the same side as the incident light)

h = 2 cm (height of the object)

Substituting the values into the mirror formula, we have:

1/-12 = 1/v - 1/-36

Simplifying the equation:

-1/12 = (36 - v)/36

-1/12 = (36 - v)/36

-1 = 36 - v

v = 36 - 1

v = 35 cm

The positive value for v indicates that the image is formed on the opposite side of the mirror from the object.

To find the size of the image, we can use the magnification formula:

magnification (m) = -v/u

Substituting the values:

m = -35/-36

m ≈ 0.972

Since the magnification is positive, it indicates an upright image.

The size of the image can be determined using the magnification formula:

m = image height (h')/object height (h)

0.972 = h'/2

h' ≈ 1.944 cm

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Answer:

Average acceleration = 0.45 m/s²

Explanation:

Given the following data;

Initial velocity, u = 0m/s

Final velocity, v = 8.6 m/s

Time, t= 19 seconds

To find the average acceleration;

In physics, acceleration can be defined as the rate of change of the velocity of an object with respect to time.

This simply means that, acceleration is given by the subtraction of final speed from the initial speed all over time.

Mathematically, acceleration is given by the formula;

\(Acceleration = \frac{initial speed - final speed}{time}\)

Substituting into the formula, we have;

Acceleration = (8.6 - 0)/19

Acceleration = 8.6/19

Average acceleration = 0.45 m/s²

One third of the total distance of 3900 m is 1300 m. The time taken to travel this distance is 5 minutes or 300 seconds. Then, the velocity of the person is 4.3 m/s.

The velocity of a moving object is the measure of its distance travelled per unit time. It is a vector quantity having both magnitude and acceleration. The units of velocity are m/s, km/hr, ft./s etc.

Velocity of an object is the ratio of the change in distance to the change in time. It is given that the total distance to the grocery is 3900 m

1/3rd of 3900 m=  1300 m

Lee travels 1300 m in 5 minutes or 300 seconds,

Hence, the velocity = distance/ time

v = 1300 m / 300 s = 4.3 m/s

Therefore, the Lee has a velocity of 4.3 m/s.

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Answer:

The sound is louder.

A longitudinal wave in an elastic medium, especially a wave producing an audible sensation.

The intensity of a sound wave is related to the amplitude of the wave, which is a measure of how much the air molecules are displaced from their resting position. When the amplitude of a sound wave increases, it causes more air molecules to be displaced, resulting in a higher sound pressure level and a louder sound.

This relationship between amplitude and perceived loudness is why, for example, turning up the volume on a stereo system increases the amplitude of the sound waves produced, leading to a louder sound.

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Answer:

D. The oxygen side is partially negative because electrons are pulled toward the oxygen side.

Explanation:

The water molecule is polar by the virtue of covalent bonds and the hydrogen bonds within and between its molecule.

The oxygen side is partially negative because the electrons are pulled toward the oxygen side.

Between oxygen and hydrogen that makes up the water molecule, oxygen is more electronegative.

An electronegative atom has more affinity for electrons. Since the electrons in the molecule of water is shared between hydrogen and oxygen, the more electronegative specie which is water draws the electron more to itself.

This leaves a net negative charge on the oxygen atom.

To draw a free-body diagram, identify all the forces acting on an object and draw them including their magnitude and direction. Use a point to represent the object.

a)

While the ball is flying through the air, the only force acting on the ball is its weight (due to gravitational attraction to the Earth).

b)

There are three forces acting on the cart: its weight, the pull to the right and the rolling friction to the left:

c)

There are three forces acting on the cart: The gravitational pull downwards, the push upwards of the air that compensates the weight, and the air resistance to the right (since the cart is traveling toward the left).

The correct answer is  P =5.81   kg.m/s.

Given that

m=250g = 0.250 Kg

U= 25 m/s

θ=30°

t= 0.2 s

This is the case of projectile motion

So the horizontal component of velocity U =  u cosθ

u = 25 cosθ

u = 25 cos 30°

u=21.65 m/s

The vertical component of velocity U = U sinθ

Vo= U sinθ

Vo= 25 sin 30°

Vo = 12.5 m/s

We know that horizontal component of velocity of ball will remain same.So the horizontal component of momentum

Px= m u

Px= 0.250 x 12.5 kg.m/s

Px=3. 125 kg.m/s

The vertical component of ball after 0.2s

V= Vo- g t

V= 21.65 - 10 x 0.2 m/s

V= 19.65 m/s

Py= m V

Py= 0.250 x 19.65 kg.m/s

Py= 4.91 kg.m/s

P=3. 125 i +4.91 j kg.m/s

Magnitude of momentum= 5.81 kg.m/s.

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While a better Operating Ratio generally indicates higher efficiency and profitability, there are circumstances where focusing on other strategic initiatives, such as infrastructure investments or pricing strategies, can result in increased revenue and ultimately lead to higher profits, even with a temporarily worse Operating Ratio.

While it may seem counterintuitive, it is indeed possible to make more money with a worse Operating Ratio in certain situations. The Operating Ratio is a financial metric used in the railroad industry to measure the efficiency of operations, calculated by dividing operating expenses by operating revenue and expressing it as a percentage. A lower Operating Ratio indicates better cost control and higher profitability.

However, there are scenarios where focusing solely on achieving a better Operating Ratio may not necessarily maximize profits. For instance, a railroad company might strategically invest in infrastructure upgrades or equipment purchases that temporarily increase operating expenses but lead to long-term revenue growth. These investments can be essential for expanding capacity, improving service quality, and attracting more customers, ultimately generating higher overall revenue despite a temporary increase in operating expenses.

Additionally, a railroad may adopt pricing strategies to maximize revenue, even if it negatively impacts the Operating Ratio. This could involve offering discounted rates or incentives to secure long-term contracts with high-volume customers, resulting in lower operating revenue per unit but ensuring a steady and predictable stream of business.

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Answer:

It is possible that the Philippines depends exclusively on geothermal energy.

Explanation:

The Philippines is located in the Pacific circle of fire, which allows this country to be a region with a large number of villagers and with great seismic activity, which makes the Philippines a region with great potential for geothermal energy. This is possible thanks to the great underground heat that the region presents, making it able to depend entirely on geothermal energy, if investments and technology capable of boosting this energy sector have been stimulated.

A force of 680 N is required to get the clock moving, so the maximum static friction is also f ˢ = 680 N. The clock is at rest, so the net vertical force acting on it is 0, and by Newton's second law,

n - mg = 0

where

n = magnitude of the normal force

m = 85 kg = mass of the clock

g = 9.8 m/s² = magnitude of the acceleration due to gravity

So we have

n = mg = (85 kg) (9.8 m/s²) = 833 N

which means the static friction f ˢ is such that

f ˢ = µ ˢ n

Solving for the coefficient of static friction gives

µ ˢ = (680 N) / (833 N) ≈ 0.82

After it starts moving, a force of 540 N is required to keep the clock going at a constant speed, so the kinetic friction is also f ᵏ = 540 N. Then

f ᵏ = µ ᵏ n

and solving for the coefficient of kinetic friction yields

µ ᵏ = (540 N) / (833 N) ≈ 0.65

The different types of WBCs with their description are as follows: neutrophil- polymorphonuclear (nucleus twisted and segmented), slightly pinkish granular cytoplasm, lymphocyte- large round nucleus takes up most of the space in the cell.

White blood cells (WBCs) are a major part of the body's immune system. They help the body in fighting infections and other related diseases. Different types of white blood cells include: granulocytes (neutrophils, eosinophils, and basophils), monocytes, and lymphocytes (T cells and B cells).

Neutrophil are polymorphonuclear (nucleus twisted and segmented) and are slightly pinkish granular cytoplasm, lymphocyte are the large round nucleus that takes up most of the space in the cell and have a small cytoplasm ring around nucleus, monocyte are large cell, twice as big as red blood cell with the nucleus is bean or "C" shaped, eosinophil are the cells full of red-pink staining granules and the nucleus is bilobed, basophil are the cell which are full of dark-purple staining granules and nucleus is bilobed.

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Answer:

its alot

Explanation:

The energy stored in the capacitor is approximately \(8.27 * 10^{-10} J\).

The energy stored in a parallel-plate capacitor can be calculated using the formula:

\(U = (1/2) * C * V^2\)

Where U is the energy stored, C is the capacitance, and V is the voltage.

The capacitance of a parallel-plate capacitor is given by the formula:

C = εA/d

Where ε is the permittivity of free space \((8.85 * 10^{-12} F/m)\), A is the area of the plates, and d is the distance between the plates.

Converting the edge length of the square plates to meters:

l = 3.60 cm = 0.0360 m

The area of each plate is:

\(A = l^2 = (0.0360 m)^2 = 1.30 * 10^{-3} m^2\)

The distance between the plates is given as 1.00 mm = 0.0010 m.

The capacitance is therefore:

\(C = (8.85 * 10^{-12} F/m) * 1.30 * 10^{-3} m^2 / 0.0010 m = 1.15 * 10^{-11} F\)

The voltage is given as 12.0 V.

Using the formula for energy stored:

\(U = (1/2) * C * V^2 = (1/2) * 1.15 * 10^{-11} F * (12.0 V)^2 = 8.27 * 10^{-10} J\)

Therefore, the energy stored in the capacitor is approximately \(8.27 * 10^{-10} J\).

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Answer:

ΔE = 1.031 eV

Explanation:

For this exercise let's calculate the energy of the photons using Planck's equation

          E = h f

wavelength and frequency are related

         c = λ f

         f = c /λ

let's substitute

         E = h c /λ

let's calculate

         E = 6.63 10⁻³⁴ 3 10⁸/1064 10⁻⁹

         E = 1.869 10⁻¹⁹ J

let's reduce to eV

         E = 1.869 10⁻¹⁹ J (1 eV / 1.6 10⁻¹⁹ J)

        E = 1.168 eV

therefore the electron affinity is

         ΔE = E - 0.137

         ΔE = 1.168 - 0.137

         ΔE = 1.031 eV

The electron affinity of thulium in units of electron volts per atom is; ΔE ≈ 1.031 eV

From Planck's equation, we can find the energy of the photons when given wavelength as;

E = hc/λ

Where;

h is Planck's constant = 6.626 × 10⁻³⁴ J.s

c is speed of light = 3 × 10⁸ m/s

λ is wavelength

We are given;

wavelength; λ = 1064 nm = 1064 × 10⁻⁹ m

Thus;

E = (6.626 × 10⁻³⁴ × 3 × 10⁸)/(1064 × 10⁻⁹)

E2 = 1.868 × 10⁻¹⁹ J

Converting to eV gives;

E2 = (1.868 × 10⁻¹⁹)/(1.6 × 10⁻¹⁹)

E2 = 1.1675 eV

We are given E1 = 0.137 eV.

Now, electron affinity is simply change in energy. Thus;

ΔE = 1.1675 - 0.137

ΔE ≈ 1.031 eV

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Answer:

c

Explanation:

Answer:

I dont know but ask a tutor

Explanation:

MOnkey Srry

13.0 m/s   that's how fast he was going

The given statement "To be considered a source of water pollution, the source must include a chemical" is false because water pollution can result from a variety of sources including physical, biological, and chemical factors.

Water pollution can be caused by a variety of sources, including physical, biological, and chemical factors. While chemical pollutants are a significant contributor to water pollution, it is not necessary for the source of water pollution to include a chemical in order to be considered a source of water pollution.

For example, excess nutrients from agricultural runoff or sewage discharge can lead to harmful algal blooms and eutrophication, which are forms of water pollution that do not necessarily involve chemicals.

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Answer:

The balloon shrank because the average kinetic energy of the gas molecules in a balloon decreases when the temperature decreases. This makes the molecules move more slowly and have less frequent and weaker collisions with the inside wall of the balloon, which causes the balloon to shrink a little.

Explanation:

Not only does it shrink in cold water but it shrinks in the cold itself.

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