I decided to take a trip to the International Space Station (ISS), which is currently orbiting the Earth at an altitude (distance from surface to ISS) of 408 km. When I get to the ISS, I decide to go for a spacewalk outside (disconnected from ISS). Let us say that I have a mass of 60 kg, and the mass of the Earth is 5.97 x 1024 kg. Newton’s gravitational constant G = 6.67 ∗ . The radius (distance from center to surface) of the ∗2 Earth = 6731 km.

The volume of the air bubble just below the surface of the lake would be 0.000015 m³  = 1.5 cm³.

V₁ = 1.5 cm³

P₁ = ρg(10) = (1000 kg/m³ * 9.8 m/s² * 10 m)

To convert V₁ to m³:

Volume₁ = 1.5 cm³ * (1 m / 100 cm)³ = 0.000015 m³

we then substitute the values into the equation:

Volume ₂ = 0.000015 m³ * (P₂ / (1000 kg/m³ * 9.8 m/s² * 10 m))

Pressure ₂ = ρg(10) = (1000 kg/m³ * 9.8 m/s² * 10 m)

We then substitute the value of P₂ into the equation for Volume 2:

V₂ = 0.000015 m³ * ((1000 kg/m³ * 9.8 m/s² * 10 m) / (1000 kg/m³ * 9.8 m/s² * 10 m))

Volume₂ = 0.000015 m³

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Raju's statement is not correct fully as it states that uniform motion is seen only in objects traveling in a straight line while ,Tejas is correct in pointing out that uniform motion can also be observed in objects traveling in circular motion. 

Uniform motion refers to the movement of an object at a constant speed in a particular direction. In this type of motion, the object covers equal distances in equal intervals of time. Suppose for example (straight line movement), a car moving on a straight road at a constant speed of 60 km/h. If the car maintains this speed without any change in direction, it exhibits uniform motion. Other example is regarding the object moving in circular path where  a race car driving around a circular track with a radius of 100 meters. If the car maintains a constant speed of 40 meters per second and completes each lap in the same amount of time, it exhibits uniform motion. Therefore, Tejas' justification is valid, as he states that uniform motion can indeed be observed in objects traveling in circular paths, in addition to objects moving in straight lines.

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Answer:

F = 3062.5  N

Explanation:

Given that,

The mass of a sled, m = 35 kg

The speed increase from 30 m/s to 65 m/s in 0.4 seconds.

We need to find the force needed to accelerate the car.

Net force is given by :

F = ma

where

a is acceleration of the car.

\(F=\dfrac{m(v-u)}{t}\\\\F=\dfrac{35\times (65-30)}{0.4}\\\\F=3062.5\ N\)

So, the net force is 3062.5  N.

Given :

Object A is 71 degrees and object B is 75 degrees .

To Find :

How will thermal energy flow.

Solution :

We know, by law of thermodynamics thermal energy will flow from higher temperature to lower temperature.

So, in the given question energy will flow from object B from object A.

Hence, this is the required solution.

The child's speed at the lowest point is 5.42 m/s.

At the highest point of the swing, the child is momentarily at rest and has only potential energy. At the lowest point, the child has only kinetic energy.

Using the conservation of mechanical energy, we can write:

Potential energy at highest point = Kinetic energy at lowest point

mgh = (1/2)mv²

where m is the mass of the child, g is the acceleration due to gravity, h is the height of the swing at the highest point, and v is the speed of the child at the lowest point.

First, we need to find the height of the swing at the highest point. Since the swing is supported by two chains, the height of the swing at the highest point is half the length of the chains:

h = (1/2)3.00 m = 1.50 m

Next, we can solve for the child's speed at the lowest point:

mgh = (1/2)mv²

40.0 kg * 9.81 m/s² * 1.50 m = (1/2) * 40.0 kg * v²

588 J = 20.0 kg * v²

v² = 29.4 m²/s²

v = 5.42 m/s

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The height of the hill is approximately 0.128 meters.

The total energy of the ball at the top of the hill is equal to its kinetic energy:

E_top = K = 15 J

At the bottom of the hill, the total energy of the ball is the sum of its kinetic and potential energies:

E_bottom = K + U = 70 J + 5 J = 75 J

The potential energy of the ball at the top of the hill is zero, since it is at the highest point. Therefore, the potential energy at the bottom of the hill is:

U = E_bottom - K = 75 J - 70 J = 5 J

The potential energy of an object at a height h is given by:

U = mgh

where m is the mass of the object, g is the acceleration due to gravity (9.8 m/s^2), and h is the height. Rearranging this equation gives:

h = U/(mg)

Substituting the values given in the problem, we get:

h = 5 J / (4 kg * 9.8 m/s^2) ≈ 0.128 m

Therefore, the height of the hill is approximately 0.128 meters.

What is kinetic energy?

Kinetic energy is the energy possessed by a moving object due to its motion. It is defined as the energy an object has by virtue of its motion, and is directly proportional to the mass of the object and the square of its velocity (speed).

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Answer:

The balance between incoming energy from the sun and outgoing energy from Earth ultimately drives our climate. This energy balance is governed by the first law of thermodynamics, also known as the law of conservation of energy.

Answer:

140 beats per minute

Explanation:

There are 60 seconds in a minute and we know that Sherry felt 14 beats in 6 seconds if you multiply 6 by 10 you get 60 seconds which can be 1 minute. Then you multiply 14 by 10 since you 14 by 10 since you multiplied 6 by 10 and you get 140 beats per minute.

The dependent, independent, and controlled variables​ are as follows:

1. Dependent - The effect of lime urea table salt and compost on the soil

2. Independent - The soil on which the elements are incorporated.

3. Controlled variable - The height of the plants.

The dependent variable is that which is tested in the experiment and in this experiment, Chandani is testing the effect of lime, urea, table salt, and compost on the soil.

The independent variable is the altered element in the experiment and for this experiment, this is the soil that receives different additives. Finally, the controlled variable is that which remains constant and that is the height of each plant that the researcher checks.

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According to the give value of the mass of lemonade and change in the temperature, the specific heat capacity of the lemonade is 3.81 J/kg/k.

The formula for the specific heat capacity (C) = Q/ m × ΔT

Q is energy added and the value, which is 334J

m is the mass of the lemonade, which is 300g = 0.3 kg

Δ T is the change in temperature, which is 19°C =(273+19)= 292 K

So, C = 334/ 0.3 × 292

         = 3.81 J/kg/k

So the specific heat capacity of the lemonade is 3.81 J/kg/k.

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Answer:

A)quadruples

Explanation:

The force between the two charges is directly proportional to the product of the charges and inversely proportional to the square of the distance between them. Hence, if distance between charges is halved (charges remaining kept constant), the force between the two charges is quadrupled

The velocity, if the satellite moves to an orbital radius of 4r is V/√4

We know that,

V = √ ( G M / r )

where,

V = Orbital velocity

G = Gravitational constant

M = Mass of the satellite

r = Radius of the orbit

Given that,

r' = 4r

V' = √ ( G M / r' )

V' = √ ( G M / 4r )

V' = ( 1 / √ 4 ) ( √ ( G M / r ) )

v' = v / √ 4

Orbital Velocity is the velocity at which one object revolves around another object in a orbit in uniform circular motion

Therefore, the velocity of the satellite that moved to an orbital radius of 4r is V/√4

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The object was dropped from a height of 122.5 meters.

The equation t = √h/4.9 relates the time it takes for an object to fall to the ground (t) to the height from which it was dropped (h). The equation states that the time it takes for the object to reach the ground can be calculated as the square root of the height divided by 4.9, with t measured in seconds.

To solve for h in the equation t = √h/4.9, we can square both sides:

t^2 = h/4.9

Multiplying both sides by 4.9:

4.9 * t^2 = h

So, the height from which an object was dropped can be calculated as:

h = 4.9 * t^2

If an object falls for 5 seconds, then:

h = 4.9 * 5^2

= 4.9 * 25

= 122.5 meters

Key points:

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Answer:

We can conclude by saying that in the beginning current will increase but after sometime, it becomes saturated.

Explanation:

Note: No information on change in number of electron generated.

Since there is a collision, the electrons emitted will not reach the collector at same time. As the voltage is increased, the the speed with which the electrons will reach the collector starts to increase. Due to this, electric current will first increases till all the emitted electrons reach the collector. Since we are not provided with the information that number of electrons generated are changing, after increasing voltage current will increase for some time and then reaches a saturated state.

We can conclude by saying that in the beginning current will increase but after sometime it becomes saturated.

Answer:

Aluminum

Explanation:

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Answer:aluminum

Explanation:

Answer:

Heat is the transfer of thermal energy between molecules within a system and is measured in Joules (J). It measures how energy moves or flows. Temperature is the average kinetic energy of molecules within a material or system and is measured in Celcius (°C), Kelvin (K), Fahrenheit (°F), or Rankine (R).

Transparent - Diamond, water, air, prism, cellophane sheet, frosted glass, glasses, clear tape, non colored plastic, lenses

Translucent - Butter paper, parchent paper, plastics, clouds, thin fabrics, colored plastics, tinted glass

Opaque - Computer, phone, book, box, file, stone, can, paper cup, cupboard (wood/steel)

The magnitude of the electric flux through the sheet is 4.05 N m² C⁻¹ (Option E).

The electric flux through a surface is given by the product of the electric field strength and the area of the surface projected perpendicular to the electric field.

In this case, the electric field strength is 18 N C⁻¹, and the area of the sheet projected perpendicular to the electric field is 0.450 m²

(since the normal to the sheet makes an angle of 60° with the electric field). Multiplying these values gives the electric flux:

Electric flux = Electric field strength × Area

Electric flux = 18 N C⁻¹ × 0.450 m²

Electric flux = 8.1 N m² C⁻¹

In summary, the magnitude of the electric flux through the sheet is 4.05 N m² C⁻¹. This value is obtained by multiplying the given electric field strength by the projected area of the sheet perpendicular to the electric field.

The angle of 60° is taken into account to determine the effective area for calculating the flux.(Option E).

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Explanation:

(a) A machine is a device by which we can either overcome a large resistive force at some point by applying a small force at a convenient point and in a desired direction or by which we can obtain a gain in the speed.

(b) An ideal machine is a machine whose parts are weightless and frictionless so that which there is no dissipation of energy in any manner. Its efficiency is 100%, i.e. the work output is equal to work input.

Explanation:\(\sf{hey\:}\) \(\sf\cancel{mate\:Here\:}\) \(\sf\red{is\:ur\:answer}\)

when it is at rest.

because,

kinetic energy occurs when object in motion.

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An object has no kinetic energy when it is at rest (Option A).

Kinetic energy is the measure of the work that an object does by virtue of its motion. Simple activities like walking, jumping, throwing, and falling involve kinetic energy. In this article, let us familiarize ourselves with the concept of kinetic energy.

Kinetic energy is the energy an object possesses due to its motion. The formula for kinetic energy is

KE = 1/2mv²,

Where m is the mass of the object and

v is its velocity.

When an object is at rest, it has zero velocity, which means that its kinetic energy is also zero.

Option B is not correct because even if an object is moving very slowly, it still has some kinetic energy. The amount of kinetic energy it has will depend on its mass and velocity.

Option C is not correct because the force acting on an object does not affect its kinetic energy directly.

Kinetic energy is related to an object's motion, not its forces.

Option D is not correct because an object's electrical charge does not affect its kinetic energy directly. The amount of kinetic energy an object has is determined solely by its motion.

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We have that the maximum tension T, that can be exerted is

\(T=1440N\\or T=254N\)

From the question we are told that

maximum withdrawal force of 250 N

the inside angle at 10 degrees.

Generally the equation for the tension  is mathematically given as

\(T = 250N/sin(10) \\\\T=1440N\)

We could also interpret as

\(T = 250N/cos(10) \\\\T=254N\)

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Answer:

In the remote past, people had no notion what function the brain has in the human organism. They saw “mush” and called it accordingly. Since brain was a borrowed word, those who began to use it, must at one time have had a native name for the content of heads.

does this help?

thanks for the points!

Answer:

Cellular respiration is important because it is the process by which cells produce energy in the form of ATP (adenosine triphosphate). ATP is the primary energy currency of cells, and it is used to fuel a wide variety of cellular processes, including muscle contractions, nerve impulses, and the synthesis of biomolecules.

Cellular respiration takes place in the mitochondria, which are organelles found in almost all eukaryotic cells. The mitochondria are the powerhouses of the cell, and they are responsible for generating most of the ATP that cells use for energy. During cellular respiration, the mitochondria break down glucose and other organic molecules to release energy, which is then used to synthesize ATP. Overall, cellular respiration is essential for the functioning of cells and the maintenance of life.

Numerous other bodily reactions are supported by cellular respiration, which produces usable ATP energy. For reactions that would not take place without an energy input but are energetically unfavorable, ATP is particularly crucial.

In cellular respiration, ATP is the primary molecule generated. The energy released during respiration is stored as ATP, the universal unit. Considering how important it is to cellular respiration, the mitochondrion can be referred to as the "powerhouse" of the cell.

Because it gives living things the energy they need to carry out all of the other tasks required to sustain life, cellular respiration is crucial.

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Answer:

brain

Explanation:

brain and blood

P = W/t

P = 3,200/18

P = 177.78 (rounded)

The distance of the blackboard from the student's eyes is approximately 1.7208 meters.

To determine the distance of the blackboard from the student's eyes, we can use the thin lens equation:

1/f = 1/di + 1/do

where f is the focal length of the lens, di is the image distance (the distance between the lens and the image of the blackboard on the retina), and do is the object distance (the distance between the lens and the blackboard).

We can first find the image distance using the formula:

1/f = 1/di + 1/do

where f is the refractive power of the lens in diopters, and di is the distance between the lens and the image on the retina in meters.

Thus, we have:

1/f = 1/di + 1/do

1/57.5 = 1/1.75 + 1/di

Solving for di, we get:

di = 0.0292 meters

Now, to find the object distance, we can subtract the image distance from the distance between the lens and the retina:

do = 1.75 - di

do = 1.7208 meters

The distance of the blackboard from the student's eyes is approximately 1.7208 meters.

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A.  The motor's speed is approximately 1086 r/min if the field resistance is raised to 50 Ω.

B. The speed of this motor as a function of the field resistance RF is approximately 1086 r/min

A. According to the magnetization curve shown in Figure 8-9, the motor's speed can be calculated by using the following equation:

EA = kϕN, where EA is the back EMF, k is a constant, ϕ is the magnetic flux, and N is the motor speed.

Since the amount of armature current remains constant, the back EMF is also constant.

Therefore, the magnetic flux must also be constant. The magnetic flux is proportional to the field current IF, which can be calculated using Ohm's law:

IF = (250 V - EA)/(RF + R₁)

At the initial field resistance of 41.67 Ω, the field current is IF = (250 V - EA)/(41.67 Ω + 0.03 Ω) = (250 V - EA)/41.70 Ω.

If the field resistance is raised to 50 Ω, then the new field current is IF = (250 V - EA)/(50 Ω + 0.03 Ω) = (250 V - EA)/50.03 Ω.

Since the magnetic flux is constant, we can set the two expressions for IF equal to each other and solve for N:

kϕN/IF1 = kϕN/IF2

N = (IF2/IF1)N1 = (250 V - EA)/(50.03 Ω + 0.03 Ω) * 1103 r/min ≈ 1086 r/min

Therefore, the motor's speed is approximately 1086 r/min if the field resistance is raised to 50 Ω.

B. The speed of the motor as a function of the field resistance RF can be plotted using the same equation used in part A:

N = (250 V - EA)/(RF + R₁ + Radj) * 1103 r/min

where Radj is the resistance of any additional resistance in the circuit. Since the load current is constant, the current through the motor is also constant, so EA is also constant.

Therefore, the speed is inversely proportional to the total resistance in the circuit, which includes the field resistance RF, armature resistance R₁, and any additional resistance Radj.

A plot of the speed as a function of the field resistance is shown in Figure 8-10. As the field resistance increases, the speed of the motor decreases due to the increased total resistance in the circuit. This relationship is linear for this type of constant-current load.

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Answer:

You can use work to add kinetic energy to a system or to increase potential energy in the system.

Explanation:

Potential energy stored in any system can be released as kinetic energy. Kinetic energy can be transformed to do work or to increase potential energy.

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