a simple pendulum of length 2.6 m makes 4.0 complete swings in 12.8 s .

To calculate the increase in system thermal energy for a 3 kg wooden block sliding 5m down a wooden incline at constant velocity, follow these steps:

1. Determine the angle of the incline:

Unfortunately, the angle of the incline is not provided in the question. Let's assume the angle is θ.

2. Calculate the gravitational force acting on the block:

The gravitational force (Fg) can be calculated using the formula

Fg = m * g,

where

m is the mass of the block (3 kg) and

g is the acceleration due to gravity (9.8 m/s²).

So, Fg = 3 kg * 9.8 m/s²

           = 29.4 N.

3. Calculate the component of the gravitational force acting parallel to the incline:

The parallel component of the gravitational force (F_parallel) can be calculated using the formula F_parallel = Fg * sin(θ).

4. Determine the work done by the parallel component of the gravitational force:

The work done (W) can be calculated using the formula

W = F_parallel * d,

where

d is the distance the block slides down the incline (5m).

5. Calculate the increase in system thermal energy:

Since the block is sliding at constant velocity, the work done by the parallel component of the gravitational force is equal to the increase in system thermal energy. So, ΔE_thermal = W.

To find the exact value for the increase in system thermal energy, the angle of the incline (θ) is needed.

However, based on the information provided and the steps outlined above, you can calculate the increase in system thermal energy once the angle is known.

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Two negatively charged objects are 2 meters apart. the student adds electrons through conduction to one of the objects, then the force of repulsion between the two objects will decrease.

The reason for this is that the negatively charged electrons on the first object will repel the negatively charged electrons on the second object, creating a force of repulsion between them. Adding electrons to one of the objects will increase the number of electrons on that object, resulting in a stronger negative charge. This increase in the negative charge on one object will make it more difficult for the electrons on the other object to push against it, reducing the force of repulsion between the two objects. It's important to note that the amount of decrease in the force of repulsion will depend on the amount of electrons added and the initial charge of the objects. Also, If the distance between the two objects does not change and the charges on the objects are not affected by other factors, the electrostatic force of repulsion between the objects will be inversely proportional to the square of the distance between them.

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Question - Two negatively charged objects are 2 meters apart. The student adds electrons through conduction to one of the objects. What is the force of repulsion between the two objects?

Answer:

An example of a first class lever in the human body is the head and neck during neck extension. The fulcrum (atlanto-occipital joint) is in between the load (front of the skull) and the effort (neck extensor muscles). The muscles are attached to the posterior part of the skull to allow for the greatest effort arm.

Explanation:

hope this helps. Thank you

Answer:

The cumulative distance that the bird travel is 13.33 Km

Explanation:

Given that,

Velocity of runner = 3.4 km/hr

Distance = 8 km

Velocity of bird = 17 km/hr

Let x is the distance from the origin where the runner run into the bird

We need to calculate the value of x

Using time of runner and bird

\(t_{r}=t_{b}\)

\(\dfrac{d_{r}}{v_{r}}=\dfrac{d_{b}}{v_{b}}\)

Put the value into the formula

\(\dfrac{x}{3.4}=\dfrac{8+(8-x)}{17}\)

\(17x=3.4\times8+3.4(8-x)\)

\(17x=27.2+27.2-3.4x\)

\(17x+3.4x=54.4\)

\(x=\dfrac{54.4}{20.4}\)

\(x=2.67\)

We need to calculate the cumulative distance that the bird travel

Using distance of bird

\(d_{b}=16-x\)

Put the value into the formula

\(d_{b}=16-2.67\)

\(d_{b}=13.33\ km\)

Hence, The cumulative distance that the bird travel is 13.33 Km

An alloy is a solid mixture composed of two or more metallic elements or a metallic element and non-metallic elements. It is created by combining and melting the constituent elements together, resulting in a uniform and homogeneous material.

The solubility of a substance is defined as the maximum amount of solute that can dissolve in a given amount of solvent at a given temperature and pressure. The maximum solubility of Pb in Sn and Sn in Pb at 170°C is affected by factors such as temperature, pressure, and the composition of the alloy.Maximum solubility  of Pb in SnAt 170°C, the maximum solubility of Pb in Sn is 0.00073 wt. %.Maximum solubility of Sn in PbAt 170°C, the maximum solubility of Sn in Pb is 1.1 wt. %.T

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Answer:

10 to 15 seconds

Explanation:

because I don't know but rarity is a strong force and it don't take long for a ball to come down

Answer:

The Sun looks bigger than other stars because it is so much closer to the Earth. The further away an object is, the smaller it appears, even if it is very big.

Explanation:

However, compared to other stars, our Sun is only a medium-sized star, meaning that some stars are much larger than the Sun and some are much smaller.

Answer:

However, compared to other stars, our Sun is only a medium-sized star, meaning that some stars are much larger than the Sun and some are much smaller. The Sun looks bigger than other stars because it is so much closer to the Earth. The further away an object is, the smaller it appears, even if it is very big.

Convection current tells that the cooler material sinks to Earth’s core, while hotter material rises to replace the cooler material.

Convection is a process of heat transfer that occurs when a fluid (such as air or liquid) is heated and moves from one place to another, carrying thermal energy with it. In the case of Earth's core, heat is generated by the radioactive decay of elements, and this heat is transferred to the surrounding mantle through conduction. The mantle material near the core heats up and becomes less dense, so it rises upwards towards the Earth's surface. As it rises, it cools down and becomes denser, so it sinks back down towards the core. This creates a circular motion known as a convection current.

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Answer:

Nuclear pores

Explanation:

The elevation in reservoir a must be=100.2631 m

To calculate the value of the elevation in reservoir a we are using the formula,

\(hf= \frac{flQ^{2}}{12.1d^{5}}\)

We know, For cast iron the chart has(f₁) 0.0012  from Moody's chart

(f₂)0.016 for cast iron.

Now the formula becomes,

\(h_{1}= h_{2}+\frac{Q^{2}}{12.1}(\frac{f_1l_1}{d_1^{5}} +\frac{f_2l_2}{d_2^{5}} )\)

we are given,

h₂= the elevation in reservoir b

=100m

Q= the volume flow rate through the cast-iron pipe.

= 0.03 m³/s

Let l₁ = 100 m pipe

l₂ = 150 m pipe

we know,

d₁=12mm

and d₂=15mm

Now we put the known values in the above equation we get,

\(h_{1}= h_{2}+\frac{Q^{2}}{12.1}(\frac{f_1l_1}{d_1^{5}} +\frac{f_2l_2}{d_2^{5}} )\)

Or,\(h_{1}= 100+\frac{(0.03)^{2}}{12.1}(\frac{0.0012\times 100}{(\frac{12}{1000})^{5}} +\frac{0.0016\times 150}{(\frac{15}{1000})^{5}} )\)

Or, \(h_{1}= 100+\frac{(0.03)^{2}}{12.1}(\frac{0.12}{0.00032} +\frac{0.24}{0.000759} )\)

Or, h₁=100+ 0.000074[375+3162.06]

Or, h₁=100.2631m

From the above calculation we can conclude that, The elevation in reservoir a must be= 100.2631m

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Answer with Explanation:

Echo depends on "how sound waves are reflected back." A hard object, like the walls of the multipurpose hall, reflects sound waves well; thus, Seema could easily hear her echo. In addition to this, the walls of the hall are also smooth and this further allows the sound waves to bounce. On the other hand, soft objects like bed cushions in Seema's room absorbs sound. This prevents the sound waves from being reflected. In addition to this, the sound waves have hard time bouncing because there are many objects in Seema's room.

Answer:

The four types of thermal energy we have...

Explanation:

Evaporation

By heating a substance to a temperature where the vapour pressure is appreciable and atoms or molecules are lost from the surface in a vacuum, a substance is said to have undergone thermal evaporation.

Conduction

The transfer of thermal energy within a substance or between materials in contact is known as thermal conduction.

Convection

Convection is the process through which matter moves inside fluids to transfer thermal energy.

Radiation

The electromagnetic radiation that a body produces when its temperature is higher than absolute zero is known as thermal radiation.

Have a lovely day :)

We have four forms of thermal energy:

Evaporation

Conduction

Convection

Radiation

The four types of thermal energy are:

Evaporation: Thermal evaporation occurs when a material is heated to a temperature where the vapour pressure is perceptible and atoms or molecules are lost off the surface in a vacuum.

Conduction: Heat conduction is the flow of thermal energy within a substance or between materials in contact.

Convection: Convection is the movement of materials inside fluids to transmit thermal energy.

Radiation: The electromagnetic radiation that a body produces when its temperature is higher than absolute zero is known as thermal radiation.

Here,

The four types of thermal energy we have...

Evaporation

Conduction

Convection

Radiation

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When air resistance is not a factor, which is called free fall, all objects fall with the same rate of acceleration.

When you first drop an object, its velocity is zero, but then it speeds up as it falls because of acceleration due to gravity.

Therefore, the true statements are:

When air resistance is not a factor, gravity causes all objects to speed up as they fall.

When you first drop an object, its velocity is zero, but then it speeds up to be moving faster when it hits the ground because of acceleration.

All objects fall with the same rate of acceleration.

The statement "All objects fall with a constant speed" is false because objects actually speed up as they fall due to the acceleration of gravity.

The statement "Gravity applies the same force to all objects" is also false because the force of gravity on an object is dependent on its mass.

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Answer:

20 Joules

Explanation:

by seeing the Graph, we know that the graph will be curved. Then we can assume that the KE at speed 2 m/s is 20 Joules. But lets count it:

KE = ½ x m x v²

KE = ½ x 10 x 2²

KE = 5 x 4 = 20 Joules

Answer:

you are very kind except for your habit

Answer:

225

Explanation:

Answer:

I am doing the test now let me make sure then I tell you ok, just a second..

225 is correct

Explanation:

Answer:

Explanation:

Amplitude does not affect wavelength. It also does not affect wave speed. Amplitude is the energy of the wave measured from the rest position to the top of the crest.

Hope this Helped!!!

Answer:

False

Explanation:

Amplitude does not affect wavelength. It also does not affect wave speed.

Amplitude is the energy of the wave measured from the rest position to the top of the crest. A wave with more energy has a higher up crest/ higher amplitude.

Answer:

I don't know

Explanation:

.....

(fish are able to breath and drink water since the power of 3 divided by how many fish in the ocean is 2 apples) and that equals to (A bad joke)

Answer:

Not not all of the elements have been discovered.

Inside a laser apparatus, the stimulation and relaxation of electrons in atoms cause many photons with the same wavelength to be continuously emitted.

From the questions given, the main objective is to fill in the gaps and add important information where necessary. The missing information is highlighted in bold and underlined.

Therefore, we can conclude that we've fully understood the concept of emission of photons and wavelength in a laser apparatus.

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Answer:

v_{f}=21.75[m/s] (velocity just before it lands)

t = 2.98 [s]

Explanation:

The key to solving this problem is the initial velocity since when the camera falls it is moving up, we will take this velocity as negative and the acceleration gravitation down as positive.

We will use the following equation of kinematics to solve this problem.

\(V_{f}^{2} =V_{o}^{2}+2*g*y\)

where:

Vf = final velocity [m/s²]

Vo = initial velocity = 7.5 [m/s]

g = gravity acceleration = 9.81 [m/s²]

y = elevation = 27 [m]

\(v_{f}^{2} = - (7.5)^{2} +(2*9.81*27)\\ v_{f}^{2} = 473.5\\v_{f}=\sqrt{473.5}\\v_{f}=21.75[m/s]\)

Now using the following equation of kinematics, we can calculate the time that the fall lasts.

\(v_{f}=v_{o}+g*t\)

\(21.75 = -7.5 +9.81*t\\9.81*t = 29.25\\t = 2.98[s]\)

Answer:

energy

Explanation:

work is the involves energy transfer when an object is moved over a distance

Answer:

Energy

Explanation: When a force causes a body to move, work is done on the object by the force. Work is the measure of the energy transfer when a force ‘F’ moves an object through a distance ‘d’. So we say that energy is transferred from one energy store to another when work is done, and therefore, energy transferred = work done.

Answer:

Explanation:

B

I need you to make me an invented poem written please not in image

The speed of an electron when its kinetic energy is 8 times its rest energy is approximately 0.93c, or 93% of the speed of light.

The kinetic energy of an object is given by 1/2mv^2, where m is the mass of the object and v is its velocity. The rest energy of an electron is approximately 0.511 MeV/c^2. Thus, when the kinetic energy of the electron is 8 times its rest energy, we have:
1/2mv^2 = 8(0.511 MeV/c^2)
Solving for v, we get:
v = sqrt[(2*8*0.511 MeV/c^2)/m]
The mass of an electron is approximately 9.11 x 10^-31 kg. Plugging in the values, we get:
v = sqrt[(8.176 MeV)/9.11 x 10^-31 kg]
v ≈ 2.79 x 10^8 m/s = 0.93c
Therefore, the speed of the electron is approximately 93% of the speed of light, or 0.93c.

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B. move farther apart

Note that:

• The higher the temperature of a substance, the higher the kinetic energy possessed by its molecules

• The higher the kinetic energy possessed by the molecules, the higher their speed of motion

• The molecules of a gas have higher kinetic energy, hence they collide with each other and with the wall of the container.

When water is heated from 25°C to a gas at 100°C, the molecules posses higher kinetic energy(due to increase in temperature). Therefore, they move farther apart.

Cold water does not react with iron. Iron, however, interacts with steam to create iron and hydrogen oxide. Fe3O4 + 4H2 = 3Fe(s) + 4H2O. Iron (II, III) oxide, also known as ferric oxide (Fe3O4), is a combination of Fe O and Fe2O3.

Ferric oxide (Fe2O3) and hydrogen gas are produced when ferrous oxide (Fe O) and water (H2O) combine (H2). This reaction yields a black solid called Fe3O4, which is frequently used as an antirust pigment. Understanding the chemical equation for this reaction is required to determine whether a specific mixture will produce Fe3O4: 2Fe3+(aq)+3H2 = 2Fe(s)+3H2(g) (g). According to this equation, two moles of iron metal will interact with to create two moles of ferric ion and three moles of hydrogen gas, it takes three moles of hydrogen gas. All of the iron will be transformed to Fe3+ ions and no Fe3O4 will occur if the combination only contains one mole of each component.

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Answer:

The function that describes the acceleration of the particle at time t is:

a(t) = -6 m/s^2.

Explanation:

To find the function that describes the acceleration of the particle at time t, we need to take the second derivative of the position function s(t).

Given:

s(t) = -3t^2 - 4t + 1

Taking the derivative of s(t) with respect to t will give us the velocity function v(t):

v(t) = d/dt [-3t^2 - 4t + 1]

= -6t - 4

Now, we can take the derivative of v(t) with respect to t to find the acceleration function a(t):

a(t) = d/dt [-6t - 4]

= -6

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