Most electricity comes from the burning of
A. Fossil fuels B. Trash C. Wood D. None of the above

From the information given, we know that the rocket has a mass of 8.00 kg and is moving upward from the launch pad. The force exerted by the burning fuel on the rocket is time-varying and can be described by the equation f(t), where t represents time. The work done by the force is given by the equation W = ∫f(t) * ds, where ds represents an infinitesimally small displacement.

To determine the total work done by the rocket, we need to integrate the force over the distance traveled. Let's assume that the rocket moves a distance d.

The work done by the force is given by the equation W = ∫f(t) * ds, where ds represents an infinitesimally small displacement.

Since the force is upward and the displacement is also upward, the angle between the force and the displacement is 0 degrees, which means the work done is positive.

To solve this equation, we need to know the specific equation for the force f(t). Once we have that, we can integrate it with respect to displacement to find the total work done by the rocket.

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Answer:

elastic potential energy

Explanation:

The situation above shows an example of an "elastic potential energy." This type of potential energy depends on the force being applied to the elastic object.

In the situation above, the elastic object is the rubber band. The resultant energy is then being stored until such time that this object will be freed. Once this happens, the elastic object will revert to its original form and the rock will soar (be released).

The amount of energy that is being stored largely depends on the distance of the "stretch" being applied to the object. It is said that the greater the force, the greater the stretch and the greater the distance covered by the rock (and vice-versa).

When the measured value of mass M becomes 2 M, the error in the measurement will be 0.00995 kg.

The percentage error is determined from the ratio of the error in meaurement to actual measurement.

Percentage error = (error / measurement) x 100%

Percentage error = (0.005 / 0.743) x 100%

Percentage error = 0.67%

New mass = 2 x 0.743

New mass = 1.486 kg

0.67 = (new error / 1.486) x 100%

0.0067 = new error / 1.486

new error = 0.0067 x 1.486

new error = 0.00995 kg

Thus, when the measured value of mass M becomes 2 M, the error in the measurement will be 0.00995 kg.

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Answer:

amplitude

Explanation:

amplitude of a wave is the maximum displacement of a point from its rest position.

hope you get it,

Answer:

The laws of thermodynamics define a group of physical quantities, such as temperature, energy, and entropy, that characterize thermodynamic systems in thermodynamic equilibrium.

Explanation:

Momentum of an object is defined as the product of the mass of object and the velocity with which it is moving.

p = mv

where, p = momentum, m= mass and v= velocity

mass m = 0.7 Kg and v = 20 m/s

p = 0.7×20 = 14 Kg-m/sec

Therefore, momentum of the object  = 14 kg-m

We need the value of v1 (velocity in the lower tube) to calculate v2. Unfortunately, the velocity in the lower tube is not provided in the given information. Without the value of v1, we cannot determine the exact speed of water in the upper tube.

The speed of water in the upper tube can be calculated using Bernoulli's equation, which relates the pressure, velocity, and height of a fluid.

Given:

Radius of the lower tube (r1) = 1.5 cm = 0.015 m

Radius of the upper tube (r2) = 1.2 cm = 0.012 m

Pressure in the lower tube (P1) = 214 kPa

Pressure in the upper tube (P2) = 107 kPa

Height difference (h) = 7.2 m

Acceleration due to gravity (g) = 9.8 m/s^2

Using Bernoulli's equation:

P1 + 1/2 ρ v1^2 + ρ g h1 = P2 + 1/2 ρ v2^2 + ρ g h2

Where:

ρ is the density of water (approximately 1000 kg/m^3)

v1 is the velocity of water in the lower tube

v2 is the velocity of water in the upper tube

h1 is the height of the lower tube

h2 is the height of the upper tube

Since the tube is at the floor level, the height difference (h) is the same as h2.

Now, let's solve the equation step by step:

Convert the pressures to Pascals:

P1 = 214 kPa = 214,000 Pa

P2 = 107 kPa = 107,000 Pa

Plug in the given values into the equation:

214,000 + 1/2 * 1000 * v1^2 + 1000 * 9.8 * 0 = 107,000 + 1/2 * 1000 * v2^2 + 1000 * 9.8 * 7.2

Simplify the equation:

1/2 * 1000 * v1^2 = 1/2 * 1000 * v2^2 + 1000 * 9.8 * 7.2

Cancel out common terms:

v1^2 = v2^2 + 9.8 * 7.2

Rearrange the equation to solve for v2:

v2^2 = v1^2 - 9.8 * 7.2

Take the square root of both sides to find v2:

v2 = √(v1^2 - 9.8 * 7.2)

Now, we need the value of v1 (velocity in the lower tube) to calculate v2. Unfortunately, the velocity in the lower tube is not provided in the given information. Without the value of v1, we cannot determine the exact speed of water in the upper tube.

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Answer:

The second Continental Congress started the Continental Army

Explanation:

The Smithsonian was established by the continental congress

Answer:

120 m/s if m/s means miles per second than

Explanation:

15 × 8

Answer:

d = 120 m

Explanation:

Data:

Use the formula:

Replace with the data, and solve:

The distance is 120 meters.

Greetings.

Answer:

The answer Is B.

Explanation:

The cats acceleration is decreased

by air resistance.

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The correct answer is D. Amount of time and area of physical contact between the substances.

Explanation:

Heat transfer refers to the flow of thermal energy or heat between two or more objects. This process involves multiple factors and implies heat from the hottest object goes to the coldest one until there is an equilibrium. To begin, heat transfer depends on the amount of thermal energy in the objects because objects must have a different amount of thermal energy for heat to flow.

Besides this, the amount of energy that flows depends on the time and the contact between the substances of objects. Indeed, objects need to be in contact or close to each other for heat to transfer, and the time needs to be enough for the process to occur. For example, if you place a pot over the fire just for a few seconds it is likely the heat transferred is minimal, which does not occur if you leave the pot more time. At the same time if the pot is in close contact with fire more heat will be transferred.-

Answer:

the answer is D on edginuity.

Explanation:

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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Answer:

✓ No work Explanation: Work is equal to a force times a displacement (parallel to the force) $$W=F*D$$ It is energy that causes a mass to be moved.

Explanation:

Part Athe average speed of the runner is 1.57 m/s.

Part B the average velocity is zero.

Part C the average speed of the runner for the first half-lap is 1.39 m/s.

Part D the average velocity of the runner for the first half-lap is 1.39 m/s.

Given, Diameter of the circular track = 40 mRadius (r) = Diameter / 2 = 40 / 2 = 20 m

Part A

To find: Average speedFormula: Average speed = Distance / TimeDistance covered by the runner = Circumference of the circular track = 2πrFor full lap, Time taken (t) = 63.35 sFor full lap,Average speed = Distance / Time= 2πr / t= 2 × 22 / 7 × 20 / 63.35≈ 1.57 m/sTherefore, the average speed of the runner is 1.57 m/s.

Part B

To find: Average velocityFormula: Average velocity = displacement / timeAs the runner completes one lap, there is no displacement, so the average velocity is zero.

Part C

To find: Average speed for the first half-lapFormula:

Average speed = Distance / TimeFor half-lap,

Distance covered by the runner = 1/2 × Circumference of the circular track = 1/2 × 2πrFor first half-lap, Time taken (t) = 28.78 sAverage speed for the first half-lap = Distance / Time= πr / t= 22 / 7 × 20 / 2 × 28.78≈ 1.39 m/sTherefore, the average speed of the runner for the first half-lap is 1.39 m/s.

Part D

To find: Average velocity for the first half-lapFormula: Average velocity = displacement / timeAs the runner completes the first half-lap, the displacement is half the circumference of the circular track.

Displacement = 1/2 × Circumference of the circular track= 1/2 × 2πrTime taken (t) = 28.7 sAverage velocity for the first half-lap = displacement / time= πr / t= 22 / 7 × 20 / 2 × 28.7≈ 1.39 m/s

Therefore, the average velocity of the runner for the first half-lap is 1.39 m/s.

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Answer:

9.75 km

Explanation:

Charlie runs 6.5 km/hr

-> Charlie wants to run for 1.5 hours

6.5km + 6.5km/2

= 6.5 km + 3.25km

= 9.75 km

Answer:

4m

Explanation:

because 1+5 is 6 +2 down is 4

Answer:

4. The choose b. 0.000355

Ans; 3.55× 10-⁴ = 0.000355

5. The choose C. 80600

Ans; 8.06 ×10⁴= 806×10² = 80600

I hope I helped you^_^

The gravitational force of sun is the strongest because sun has the largest mass and acceleration due to gravity of about 275 m/s².

According to Newton's second law of motion, the gravitational force exerted by each planet or object is directly proportional to acceleration due to gravity and the mass of the object or planet.

The magnitude of the gravitational force is calculated as;

F = mg

where;

Therefore, the gravitational force of sun is the strongest because sun has the largest mass and acceleration due to gravity of about 275 m/s².

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The Sun is the body that exerts the strongest gravitational force on us.

The Sun exerts the strongest gravitational energy due its huge size and

mass . This also helps it to keep the other members of the solar system such

as the moon, planets and stars in a defined path and prevents them crashing into each other.

The Sun is a very important object in the solar system as a result of its large

size and mass and ability to release solar energy for food production in plants.

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In a simple electrical circuit, if it contains a battery, a light bulb, and a properly connected ammeter, the ammeter has a very low internal resistance because it is connected in series with the circuit.

An electrical circuit is made up of a combination of resistors, voltage sources, and current sources that are interconnected in a closed loop. It is used to generate an electric current in a complete circuit and can be as straightforward as a battery connected to a bulb or as complicated as a full-scale electronic circuit.

Ammeters are measuring devices that are used to measure current in a circuit. The ammeter should be connected in series with the circuit to allow current to flow through it. An ammeter with a very low internal resistance should be used since any extra resistance in the ammeter can change the current being measured.

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False. Spatial resolution, contrast resolution, noise, and artifacts are not identical in screen-film imaging and computed radiography (CR). There are significant differences between these two imaging modalities.

Spatial Resolution: Spatial resolution refers to the ability of an imaging system to depict small structures or details.

Contrast Resolution: Contrast resolution relates to the ability of an imaging system to distinguish between different shades of gray or contrast levels. CR systems have an advantage over screen-film imaging in terms of contrast resolution.

Noise: Noise refers to random variations in the image that can reduce image clarity and affect diagnostic quality. CR systems generally have higher noise levels compared to screen-film imaging.

Artifacts: Artifacts are unwanted features or distortions that can appear in an image.

It's important to note that advancements in digital imaging technology, such as digital radiography (DR), have further improved spatial resolution, contrast resolution, noise levels, and artifact reduction compared to CR and screen-film imaging. DR systems offer even higher image quality and diagnostic capabilities due to their direct digital capture and advanced image processing capabilities.

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The new frequency in a material with a refractive index of 2.60 is 209 MHz.

The frequency of a light beam does not change when it passes through different materials. However, the speed and wavelength of the light do change, which affects the refractive index. The formula for calculating the frequency in a different material is,

f' = f/n

Where f' is the new frequency, f is the original frequency, and n is the refractive index of the new material.

Using this formula, we can find that the new frequency in a material with a refractive index of 2.60 is:

f' = 340 MHz / 2.60 = 130.77 ≈ 209 MHz.

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The momentum of the probe after the retrorocket ceases to fire is 9.9 * 10^7 Kg m/s

We know that the momentum of an object has to do with the product of the mass and the velocity of an object. The momentum of an object is a vector quantity and the direction of the momentum is the direction of the velocity of the object that is in motion.

According to the Newton second law of motion, we know that the rate of change of the momentum is equal to the impressed force that is acting on the body.

We know that;

\(F_{t}\) = \(p_{f}\) -\(p_{i}\)

F = force

t = time taken

\(p_{f}\)= final velocity

\(p_{i}\) = initial velocity

\(p_{f}\) = \(F_{t}\)  + -\(p_{i}\)

\(p_{f}\) = (2.0 * 10^6 * 12 s) + 7.5 * 10^7

\(p_{f}\)  = 2.4 * 10^7 + 7.5 * 10^7

\(p_{f}\)  = 9.9 * 10^7 Kg m/s

Hence, the momentum of the retrorocket is 9.9 * 10^7 Kg m/s.

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Missing parts;

A  space probe is traveling in outer space with a momentum that has a magnitude of  7.5 * 10^7 kgm/s. A retrorocket is fired to slow down the probe. It applies a force to the probe that has a magnitude of 2.0  * 10^6 N and a direction opposite to the probe's motion. It fires for a period of 12 s. Determine the momentum of the probe after the retrorocket ceases fire.

Michelson used a technique called the interferometer to measure the time that light took to make the round-trip to the distant mountain.

The interferometer is an optical instrument that splits a beam of light into two separate beams, which then travel different paths before being recombined to produce an interference pattern.

In Michelson's experiment, one of the beams of light was directed towards a mirror located at the top of the mountain, while the other beam was reflected back to a detector. The two beams of light were then recombined and the resulting interference pattern was analyzed to determine the time difference between the two paths.

By measuring the time difference between the two paths, Michelson was able to calculate the distance between the mountain and his laboratory. He then used this distance to determine the speed of light, which allowed him to calculate the time it took for the light to make the round-trip.

Overall, Michelson's use of the interferometer was a groundbreaking achievement in the field of physics, and his measurements of the speed of light have become a cornerstone of modern physics.

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Examples of amorphous solids include Metals. Hence, the correct option is (A).

Amorphous solids are materials that lack long-range order in their atomic or molecular structure, and therefore have properties that are different from those of crystalline solids. Examples of amorphous solids include glass, plastics, gels, and some ceramics. Thermal energy is not an example of an amorphous solid, as it is a form of energy rather than a material. Nitrogen, on the other hand, can exist in both amorphous and crystalline forms, depending on the conditions of formation. However, metals are not typically considered to be amorphous solids, as they generally have a crystalline structure, although some metallic glasses can exhibit amorphous properties.

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Answer:

1

Explanation:

V=2*2*0.2=0.8m^3

d=m/v 1000*0.8=800kg

800=700+100(n)            (n for barrels)

n=1

This question deals with the concept of buoyancy. This can be solved by calculating the buoyant force.

"1" barrels, each of mass 100 kg, could be placed on the raft before it sinks to the surface water.

First, we need to calculate the buoyant force on the raft due to water. This force is equal to the weight of the volume of water equal to the volume of the raft.

Buoyant Force = (Volume of Raft)(Density of Water)(g)

Buoyant Force = [(2 m)(2 m)(0.2 m)][1000 kg/m³](9.81 m/s²)

Buoyant Force = (0.8 m³)(1000 kg/m³)(9.81 m/s²)

Buoyant Force = 7848 N

For the raft to sink the weight of the raft combined with the weight of barrels must exceed the buoyant force. Now, we will calculate the weight of raft and barrels and equate it with the buoyant force.

[Mass of Raft + (No. of Barrels)(Mass of 1 Barrel)][g] = Buoyant Force

[700 kg + (No. of Barrels)(100 kg)][9.81 m/s²] = 7848 N

(No. of Barrels)(981 N) = 7848 N - 6867 N

\(No. of Barrels = \frac{981\ N}{981\ N}\)

No. of Barrels = 1

The attached picture shows the concept of buoyancy.

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The pressure inside the sphere will be lower in the ice and water mixture than it was in the boiling water, but the exact value depends on the initial conditions and specific values of the variables in the ideal gas law.

Assuming the rigid, hollow sphere is initially filled with air, the pressure inside the sphere will be equal to the atmospheric pressure of 1.0 atm when it is submerged in boiling water and the valve is open. This is because the air inside the sphere is in equilibrium with the surrounding air pressure.

When the valve is closed, the air inside the sphere is trapped and the pressure inside the sphere will decrease as the temperature of the air decreases due to thermal contraction. When the sphere is placed in a mixture of ice and water, the temperature of the air inside the sphere will decrease further and its pressure will decrease accordingly.

The final pressure inside the sphere in the ice and water mixture will depend on the volume of the sphere and the amount of air trapped inside. Assuming the volume of the sphere remains constant, the pressure inside the sphere will decrease as the temperature decreases according to the ideal gas law:

PV = nRT

where P is the pressure, V is the volume, n is the number of moles of gas, R is the gas constant, and T is the temperature.

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