Work energy theorem question - your friend has a tire swing in her backyard. the 35 kg tire is suspended by a long rope from a tree branch. how much work would be required to move the tire a vertical distance of 1.0 m from its original position at a constant speed of 1 m/s? what is the initial potential energy of the swing? what is the final pe? what is the change in pe? what is the work done?

The Earth's land areas, oceans, and atmosphere maintain fairly constant average temperatures due to a process called the Earth's heat balance, which refers to the balance between the amount of energy the Earth absorbs from the Sun and the amount of energy the Earth radiates back into space.

The Earth's heat balance is maintained by a number of processes that regulate the temperature of the Earth's surface, including:

Overall, the Earth's heat balance is maintained by a complex interplay of processes that regulate the temperature of the Earth's surface and atmosphere.

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Answer:

1st: Radiation

2nd: Conduction

3rd: Convection

Explanation:

I actually learned this before in school. Yay

Answer:

Its C

Thank me later

Now bye

Answer:

The velocity of the bullet and the sack after the bullet hits the sack is [0.2,0.2] m/s.

Explanation:

To calculate the velocity of the bullet and the sack after the bullet hits the sack, we can use the equation:

vf = (m1 * v1 + m2 * v2) / (m1 + m2)

Plugging in the values given in the question, we get:

vf = (0.01 kg * [230,0] m/s + 9.99 kg * [0,0.2] m/s) / (0.01 kg + 9.99 kg)

Solving for vf, we get:

vf = [0.2, 0.2] m/s

Therefore, the velocity of the bullet and the sack after the bullet hits the sack is [0.2,0.2] m/s.

The initial and final momentum of a body will be conserved during collision. From this concept, the final velocity of the bullet and sack is 2.5 m/s.

Momentum is the product of mass and velocity of a body.  During a collision of two bodies, the sum of initial momentum of the two bodies will be equal to the sum of their final momentum.

Given that, mass of bullet = 0.01 Kg

velocity = 2300 m/s

mass of sand sack = 9.99 Kg

velocity = 0.2 m/s

Then sum of initial momentum = (0.01 kg × 2300 m/s) + (9.99 kg × 0.2 m/s) = 24.9 kg m/s.

The final momentum of the combined mass  = (9.99 kg + 0.01 kg) v = 24.9 Kg m/s

Thus, final velocity v = 24.9 / ( (9.99 kg + 0.01 kg) = 2.5 m/s

Therefore, the velocity of the bullet and sack after the collision will be 2.5 m/s.

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Answer:

her displacement s=337.5m

Explanation:

check out the above attachment ☝️

Displacement after 15.0 seconds s= 337.5 m

The rate of change of velocity is called acceleration.

Acceleration. speed is the charge of the exchange of displacement. Acceleration is the charge of the exchange of speed. velocity is a vector quantity because it consists of each significance and direction. Acceleration is also a vector quantity as it's far just the fee of alternate of pace.

Acceleration of 3.0 m/s²

Time= 15.0 seconds

S= ut + 1/2 at²

S = 0+0.5*3*15*15

 =337.5 m

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Only the horizontal component of the tension force is performing work on the crate. This component has magnitude (50 N) cos(30°) = 25√3 N, so the work done is

(25√3 N) (10 m) = 250√3 N•m ≈ 433 J

A. The potential energy of the payload relative to the bottom of the shaft is equal to the product of the payload's mass and the gravitational acceleration, multiplied by the height of the shaft: PE = mgh = (45 kg)(9.81 m/s2)(132 m) = 58,158 J.

Potential energy is the stored energy of an object due to its position or condition. It is the ability of an object to do work, based on its position or state. Potential energy is the energy held by an object because of its position relative to other objects or a force, such as gravity. When an object is held above the ground, it has potential energy because of the force of gravity acting on it. If a book is resting on a shelf, it has potential energy because of its position.

B. The payload's speed at the bottom of the shaft is equal to the square root of 2 times the gravitational acceleration multiplied by the height of the shaft: v = √2gh = √2(9.81 m/s2)(132 m) = 44.7 m/s. This converts to about 101 mph.

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A piece of steel sinks in water because steel is denser than water. However, a steel ship is a hollow object made of steel and contains a lot of air in it. Due to presence of a lot of air in it, the average density of the ship becomes less than the density of water. Hence a ship floats in water.

Answer:

Cause its a steel block

Explanation:

thats like putting a brick in the water and expecting it to float

Answer:

agree

Explanation:

Answer:

THE ANSWER IS A,B,F

Explanation:

Answer:

Mitochondria and chloroplast are organelles found in a plant cell. However, chloroplast is absent in an animal but mitochondria is found in both. Mitochondria generates energy for the cell in the form of ATP using oxygen and nutrients. Chloroplast is the site for photosynthesis in a plant cell.

Answer:

Its the first option

Melting point

Well we know that if we freeze something, it will turn into a solid right? If it was boiling point, it would be steam, so your answer would be Melting Point

Hope this helps you out!

Answer:

It is 52° below the celestial equator.

Explanation:

The declination is the angle in degrees measured north (+) or south (-) of the an imaginary line called the celestial equator.

The celestial equator is a projection of the earth's equator on the celestial sphere. imaginary

The star named Canopus has a declination of approximately –52°.

Since the angle is negative, this shows that it is south or below the celestial equator and at 52° south of the celestial equator.

Thus, the star named Caponus is 52° below the celestial equator.

Answer:

the answer is 'it is 52° below the celestial equator.' :))

Explanation:

its the correct answer on the quizz,,, good luck!! :3

The change in enthalpy is  0 J/kg if the incompressible substance with a density of 1000 kg/m3 is isothermally compressed from 100 to 1000 kpa. Thus, option b is correct.

The given data is as follows:

The density of substance = 1000 kg/m3

In-compression pressure = 100 to 1000 kph

The given substance is incompressible. So its specific volume stays constant during the process. The work done is Zero.

Assuming that the process is Isothermal, the temperature remains steady.

The change in enthalpy is calculated by using the formula:

ΔH = m × C × ΔT

The density of mass is calculated by using the formula,

m = V × ρ = 1 m3 × 1000 kg/m3

m = 1000 kg

Change in enthalpy is calculated as:

ΔH = m × C × ΔT

ΔH = 1000 kg × 0 J/(kg·K) × 0 K

ΔH = 0 J/kg

Therefore we can conclude that the change in enthalpy is  0 J/kg.

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The complete question is-

an incompressible substance with a density of 1000 kg/m3 is isothermally compressed from 100 to 1000 kph. determine the change in enthalpy. multiple choice questions.

a.900 kj/kg

b. 0 kj/kg

c.10 kj/kg

d.0.9 kj/kg

The current of the river is 7 mph, and the speed the rower would row at in still water is 20 mph.

The speed downstream is : V + C).

distance between the cities = 18 miles,

time taken =  2/3 hour

(V + C) = 18 / (2/3) = 27 mph

The speed upstream is = V - C

distance between the cities = 18 miles

time taken upstream =  18/13 hour

(V - C) = 18 / (18/13)

= 13 mph

(V + C) = 27                           (Equation 1)

(V - C) = 13                            (Equation 2)

We add both equations:  

2V = 40

V = 20 mph

(20 + C) = 27

C = 27 - 20

C = 7 mph

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Based on the principle of moments, the moment of the 100 N force is 50 J.

The moment of a force, also known as torque, is a measure of the rotational effect or turning effect produced by a force about a particular point or axis.

Mathematically, the moment of a force (τ) is given by:

τ = Force × perpendicular distance

The moment of the 100 N force will be:

force = 100 N

the perpendicular distance from the axis of rotation = 50 cm (75 -25)

Moment = 100 * 0.5

Moment = 50 J

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The impeller of a centrifugal pump is the component that transmits energy in the form of velocity to the water. It consists of curved blades or vanes that rotate, creating a centrifugal force that accelerates the fluid, increasing its velocity.

In a centrifugal pump, the impeller is responsible for transferring energy to the water in the form of velocity. The impeller is typically a wheel-like structure with curved blades or vanes.

When the pump is operational, the impeller rotates rapidly, drawing in water through the inlet. As the water enters the impeller, the curved blades exert a force on it, imparting angular momentum and causing it to move in a tangential direction.

Due to the centrifugal force generated by the rotating impeller, the water is propelled outward and accelerates as it moves away from the impeller's center.

This acceleration increases the water's velocity, transforming the potential energy into kinetic energy. The high-velocity water is then discharged from the impeller into the pump's volute or diffuser section, where the kinetic energy is gradually converted back into pressure energy.

The impeller is the crucial component of a centrifugal pump that transmits energy in the form of velocity to the water. Through its rotation and curved blades, it imparts angular momentum to the water, resulting in increased velocity and kinetic energy, which drives the flow of water through the pump system.

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The overall efficiency (in %) of the plant is 30% if the steam power plant with a power output of 150 MW consumes coal at a rate of 60 tons/h.

Efficiency is the capacity to achieve something or get the desired outcome without wasting resources, time, money, energy, or effort.

It is given that:

A steam power plant with a power output of 150 MW consumes coal at a rate of 60 tonnes per hour.

As we know,

Thermal efficiency Te = (W/Q)x100

m(coal) = 60 tons/h = 50/3 kg/s

The heating value of the coal is 30,000 kj/k = 30 MJ/kg

Q = (50/3)30

Q = 500 MW

Te = (150/500)100

Te = 30%

Thus, the overall efficiency (in %) of the plant is 30% if the steam power plant with a power output of 150 MW consumes coal at a rate of 60 tons/h.

The question is incomplete.

The complete question is:

A steam power plant with a power output of 150 MW consumes coal at a rate of 60 tonnes per hour. If the heating value of coal is 30,000 KJ/kg, determine the overall efficiency (in %) of the plant.

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Answer:

1.28second

Explanation:

The speed of light is constant everywhere, it is

299,792,458m/s=299,792.458km/s

Therefore it takes

\( \frac{384000}{299792458} = 1.28sec\)

Answer:

I would say tension force the last one because the gravitational force brinsg it down more.

Explanation:

Dont mind if its wrong im sorry

The decay of uranium isotopes is used to provide information about the age of earth.

Answer:

B is the right answer

Explanation:

It is decreasing.

A car maintains a constant speed while driving straight ahead.

The acceleration of an object is the rate of change of velocity with time. It is measured in meter per second square.

The car undergoes velocity when there is change in direction of the speed.

Thus, the only option that does not describe acceleration is a car maintains a constant speed while driving straight ahead.

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There are two main types of optical telescopes: refracting telescopes and reflecting telescopes.

1. Refracting telescopes: These telescopes use lenses to gather and focus light. The primary component is a large objective lens that collects and refracts incoming light towards a focal point. The light is then magnified by an eyepiece for viewing. Refracting telescopes are known for providing sharp and clear images, especially when observing celestial objects such as the Moon and planets. However, they can suffer from chromatic aberration, which causes color distortion due to the different wavelengths of light bending at different angles.

2. Reflecting telescopes: Reflecting telescopes use a curved mirror to gather and focus light. The primary mirror collects incoming light and reflects it to a secondary mirror, which then directs the light towards the eyepiece or a camera. Reflecting telescopes eliminate chromatic aberration, as mirrors do not refract light like lenses. They are also more versatile and cost-effective than refracting telescopes, allowing for larger apertures and the ability to gather more light. Reflecting telescopes are commonly used in astronomical research and provide high-quality images of various celestial objects, including galaxies, nebulae, and distant stars.

Overall, both types of telescopes have their advantages and are used for different applications in the field of astronomy.

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mass = 2.76 g

volume = 25.5 mL

density of the fluid = 2.5 g/mL

R. D = Density of fluid

Density of water

Density of water = 1g/mL

R. D = 2.5/1

R. D = 2.5

The saturation of the soil sample is 0.16 and the dry unit weight is X kN/m3.

The saturation of the soil sample can be calculated using the relationship between porosity and saturation. Porosity (n) is defined as the ratio of the void volume to the total volume of the soil sample. It is given that the porosity of the soil sample is 0.49. Since porosity is the ratio of void volume to total volume, the saturation (S) can be calculated as 1 minus the porosity:

Saturation (S) = 1 - porosity = 1 - 0.49 = 0.51

To calculate the dry unit weight (γd) of the soil sample, we need to consider the specific gravity (Gs) and the moisture content (w). The dry unit weight is the weight of the solid particles per unit volume of the soil sample. The formula to calculate the dry unit weight is:

γd = Gs * γw / (1 + w)

Given that the specific gravity (Gs) is 2.41 and the moisture content (w) is 0.33, we can substitute these values into the formula to calculate the dry unit weight.

Therefore, the saturation of the soil sample is 0.16, and the value of the dry unit weight is X kN/m3.

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(1) The angular velocity at position 1 of a uniform rod rotating freely around an axis can be determined.

(2) The velocity of the center of mass at position 2.

(1) To determine the angular velocity at position 1, we need to consider the conservation of angular momentum. Since the rod is rotating freely, there are no external torques acting on it.

The initial angular momentum is zero, and at position 1, the angular momentum is given by L = Iω, where I is the moment of inertia of the rod and ω is the angular velocity. By substituting the values of mass and length of the rod into the formula for moment of inertia, we can solve for ω.

(2) To calculate the velocity of the center of mass at position 2, relative to position 1 and at an angle theta, we can use the concept of angular velocity and linear velocity. The linear velocity of the center of mass is given by v = ωr, where ω is the angular velocity and r is the distance between the center of mass and the axis of rotation. By considering the given angle theta and the length of the rod, we can determine the distance r.

Substituting the value of ω calculated in part (1) into the formula, we can find the velocity of the center of mass at position 2, relative to position 1 and at angle theta.

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Answer:

Magnetic field lines exit out of the North pole . Magnetic field lines enter into the South pole. Magnetic field lines travel around a bar magnet in closed loops.

Explanation:

Magnetic field lines shows the direction of a magnetic force and how it acts, it gives the direction of the magnetic field at that point in time.

For a bar magnetic, the magnetic field lines runs from the north pole to the south pole, i.e. it exits the north pole and enters into the south pole. This magnetic field lines also go through the magnet forming closed loops without ends.

Answer:

Magnetic field lines exit out of the

✔ north pole

.

Magnetic field lines enter into the

✔ south pole

.

Magnetic field lines travel around a bar magnet in

✔ a closed loop

.

Explanation:

Yes, a friction force to the right acts on the furniture.

The force preventing solid surfaces, fluid layers, and material components from sliding past one another are known as friction. When surfaces in contact move past one another, the friction between the two surfaces transforms kinetic energy into thermal energy (that is, it converts work to heat). As demonstrated by the utilization of friction produced by rubbing pieces of wood together to start a fire, this feature can have dramatic effects. Every time there is motion with friction, such as when a viscous fluid is agitated, kinetic energy is transformed into thermal energy. Wear is a significant side effect of several types of friction that can result in deteriorated performance or component damage. The discipline of tribology includes friction.

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Answer:

When an object falls, gravity pulls the object towards the ground and causes the object to accelerate by 9.8m/s each second. Regardless of mass, every object accelerates at the same rate (9.8m/s) when dropped unless there´s air resistance.  

Susan sees cloud through the window because most of the light hitting the window was transmitted when it passed through the window. Option A

The windows of an airplane are designed to be transparent, allowing light to pass through them with minimal distortion. This makes it easy to see outside the window and observe the clouds, the ground, or other objects.

Thus the fact that the window can be seen to be transparent means that it is able to transmit light as we have said above here.

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Most of the light hitting the window was transmitted when it passed through the window.

option A.

Light travels in straight lines unless it is reflected, refracted, or absorbed by a material. When light passes through a material, such as a window, it can be transmitted (pass through the material), reflected (bounce off the material), or refracted (bend as it passes through the material).

In the case of the airplane window, it is designed to be transparent, which means that it allows most of the light hitting it to pass through, without significant absorption or reflection. This is because the window is made of a material that is highly transparent to visible light, such as glass or acrylic.

Thus, the reason Susan could see the clouds through the window of the airplane is that the window was made of materials that allow most of the light hitting it to pass through, which is called transmission.

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