Why can we use regular air to
make liquid oxygen even though
it is a mixture of different
gases?

The minimum velocity the roller-coaster need when going over the 12 m  to make it to the top of the 30 m hill is equal to 18.78 m/s. Therefore, option (D) is correct.

Energy can be transformed from one to another but can neither be created nor destroyed. Energy is present in nature in several forms such as heat, nuclear energy, electricity, chemical energy, and so on.

If every form of energy is considered, then the total energy of an isolated system remains constant. This law of energy applies to all types of energy in our universe.

From the law of conservation of energy, the energy of the roller-coaster goes:

\({\displaystyle \frac{1}{2} mv^2 +mgh_1 = mgh_2\)

Given the height of the first hill, h₁ = 12m

The height of the second hill, h₂ = 30 m

The gravitational acceleration, g = 9.8 m/s²

We can find the value of the minimum velocity of the roller-coaster from the above equation:

\({\displaystyle \frac{1}{2} v^2 +gh_1 = gh_2\)

0.5 × v²  + (9.8) × 12 = (9.8) × 30

0.5 v² = 176.6

v = 18.78 m/s

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When you create a best-fit line, the expected value of the slope represents the average rate of change in the dependent variable (y) for every unit increase in the independent variable (x). The slope helps you make predictions and understand the relationship between the two variables in your dataset.

When you create a best-fit line, the expected value of the slope is the coefficient that represents the rate of change between the two variables being analyzed. The slope is determined by finding the ratio of the change in the dependent variable to the change in the independent variable.

It is important to note that the slope of a best-fit line is not always a perfect representation of the true relationship between the variables, but rather an approximation based on the available data. Therefore, the expected value of the slope is subject to variation and uncertainty depending on the specific data set and methodology used to create the best-fit line.
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Answer:

The net force is now 12

Explanation:

The boy is applying a force of 5 newtons + his mother is helping him to apply 7 newtons = 12 newtons.

hi <3

i would say it is 'electricity'

hope this helps :)

a concentric ring model in which social groupings are spatially organised in a hierarchy of rings. The upper class resides further away from the center, while the lower class is located closer to it.

The concentric ring model operates on the presumption that cultural content results from the incorporation of original ideas into the creation and/or presentation of music, text, and picture, and that these concepts originate in the fundamental artistic creativity spheres. Burgess' concentric ring model concept envisions growth occurring in a series of concentric rings surrounding the concentric ring model . According to Hoyt's sector model, economic expansion follows transportation corridors.

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The time required to cover the Moon to a depth of 1.20 meters with micrometeorites.

To find out how long it would take to cover the Moon to a depth of 1.20 meters with micrometeorites, we can calculate the volume of the Moon and then divide it by the volume of one micrometeorite. Let's break down the calculation step by step:

Calculate the volume of the Moon:

The average radius of the Moon is approximately 1.737 ×10⁶ meters. Using the formula for the volume of a sphere, V = (4÷3)πr³, we can calculate the volume of the Moon.

\(V_{moon}\) = (4÷3)π(1.737 × 10⁶)³

Calculate the volume of one micrometeorite:

The diameter of the micrometeorite is given as 1.30 ×10⁽⁻⁶⁾ meters, which means the radius is half of that.

\(r_{meteorite}\) = (1.30 × 10⁽⁻⁶⁾)÷2

Using the formula for the volume of a sphere, V = (4÷3)πr₃, we can calculate the volume of one micrometeorite.

\(V_{meteorite}\) = (4÷3)π((1.30 × 10⁽⁻⁶⁾)÷2)³

Calculate the number of micrometeorites needed to fill the Moon:

To find the number of micrometeorites required to fill the Moon, we divide the volume of the Moon by the volume of one micrometeorite.

\(N_{meteorites}\) = \(V_{moon}\) ÷ \(V_{meteorite}\)

Calculate the time to fill the Moon:

Since one micrometeorite strikes each square meter of the Moon each second, we can equate the number of micrometeorites needed to fill the Moon to the number of seconds it would take.

Time = \(N_{meteorites}\) ÷ (1 m²/s)

Convert seconds to years:

Finally, we convert the time in seconds to years by dividing by the number of seconds in a year (assuming 365.25 days in a year and 24 hours in a day).

\(Time_{years}\) = Time ÷ (365.25 days/year × 24 hours/day × 3600 seconds/hour)

Performing these calculations will give us the time required to cover the Moon to a depth of 1.20 meters with micrometeorites.

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Answer:

Yes.

Explanation: the magnitude of the force is extremely small because the masses of the students are small relative to Earth's mass.

The gravitational force between two students sitting in classroom exists but its effect are not visible because the distance between these students is very very very small.

We have two students sitting in a classroom.

We have to investigate whether or not there is gravitational force between these two students.

Newton's law of universal gravitation states that every particle attracts every other particle in the universe with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers. Mathematically -

\($F=\frac{GMm}{r^{2} }\)

According to the question, we have - Two students sitting in a classroom.

Take a close look and you will identify that the distance between any two students in classroom is very small. Gravitational force is also the weakest force since the value of Universal gravitation constant (G) = 6.674 x \(10^{-11}\) \(m^{3}kg^{-1}s^{-2}\) is very small. Moreover, the force of gravitation is inversely proportional to square of distance between two bodies -

\($F \alpha \frac{1}{r^{2} }\)

This will make the gravitational force even more weak. This is the main reason why you don't observe any effects of this force. The gravitational force exists between any two bodies that have mass and energy, but its magnitude might depend upon other factors to.

Hence, the gravitational force between two students sitting in classroom exists but its effect are not visible because the distance between these students is very very very small.

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We will see that the electric field in that point is:

Ex = 31.598 N/μc

Remember that for a charge Q, the electric field is given by:

\(E = k*\frac{Q}{r^2} (n_x, n_y)\)

Where the versor is in the direction of r,  k is a constant, and r is the distance to the charge.

In this case, we have two charges, one at  (0cm, 5cm) and the other at (0cm, -5cm). Because of the symmetry on the y-axis, we know that the y-component will be canceled, so we only have the x-component.

\(E_x = k*(\frac{30 \mu C}{(12cm)^2 + (5cm)^2} + \frac{30 \mu C}{(12cm)^2 + (-5cm)^2} )\\\\E_x = k*(\frac{60 \mu C}{169cm^2})\)

Now we know that the value of k, the Coulomb's constant is:

k = 8,9*10^9 N*m^2/C^2

Writing this in cm and μc (multiplying by 10^4 and dividing by 10^12 we get)

k = 8.9*10^9*(10^4*10^-12) N*cm^2/μc^2

k =  8.9*10 N*cm^2/μc^2

Now we use that in our equation:

\(E_x = (8.9*10 N*cm^2/\mu c^2)*(\frac{60 \mu C}{169cm^2}) = 31.598N/\mu c\)

This is the electric field on the point (12cm, 0cm).

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At the peak height, the vertical velocity of the skull is zero. Therefore, the total velocity at peak height is equal to the horizontal velocity.

A. To find the x and y components of the initial velocity:

The horizontal component of the velocity (vx) remains constant throughout the motion, while the vertical component of the velocity (vy) changes due to the effect of gravity.

vx = v * cos(θ)

vx = 18.0 m/s * cos(70)

vx = 5.56 m/s (approx)

vy = v * sin(θ)

vy = 18.0 m/s * sin(70)

vy = 17.2 m/s (approx)

Therefore, the x and y components of the initial velocity are 5.56 m/s and 17.2 m/s, respectively.

B. To find the speed of the skull at its peak height:

At the highest point of the trajectory, the vertical component of the velocity becomes zero, and only the horizontal component remains.

The time taken to reach the peak height can be found using:

vy = u * sin(θ) - gt

0 = 18.0 * sin(70) - 9.81t

t = 1.23 s (approx)

Using the time taken to reach the peak height, we can find the velocity at that point using:

v = u - gt

v = 18.0 * sin(70) - 9.81 * 1.23

v = 4.22 m/s (approx)

Therefore, the speed of the skull at its peak height is 4.22 m/s.

C. To find the time taken for the skull to hit the floor:

The time taken for the skull to reach the peak height is t = 1.23 s (approx) as found above. The total time taken for the skull to hit the floor can be found by doubling this time.

Total time = 2t

Total time = 2 * 1.23

Total time = 2.46 s (approx)

Therefore, the skull takes approximately 2.46 seconds to hit the floor.

D. To calculate the range of the given skull:

The range is the horizontal distance traveled by the skull before it hits the floor. We can use the horizontal component of the velocity and the time taken for the skull to hit the floor to find the range.

Range = vx * t

Range = 5.56 m/s * 2.46 s

Range = 13.7 m (approx)

Therefore, the range of the skull is approximately 13.7 meters.

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The full question is:

A Physicist is testing a brand new projectile launcher in her lab that is designed to launch human skulls in a vacuum. She can adjust the angle to whatever she wants. She tests it by launching a skull at an angle of 70 degrees above the horizontal at a velocity of 18.0m/s at ground level.  

A. What are the x and y components of the skull's initial velocity?

B. How fast is the skull traveling at its peak height?

C. How long until the skull hits the floor?

D. What is the range of the skull?

Answer:

A) half the original force

Answer:

Is this a research paper?

Answer:

68

Explanation:

now it

To steadily increase the velocity of something, it requires c. constant net force.

According to Newton's second law of motion, the acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass. Mathematically, this is represented as F = ma, where F is the net force, m is the mass, and a is the acceleration.  When a constant net force acts on an object, it causes the object to accelerate at a constant rate. This acceleration leads to a steady increase in the object's velocity.

It is important to note that a steadily increasing force would result in an object experiencing an increasing acceleration, which would cause the velocity to increase at an increasing rate rather than steadily. On the other hand, a decreasing force would result in a decreasing acceleration, causing the velocity to increase at a slower rate or even decrease. In conclusion, to steadily increase the velocity of an object, a constant net force must be applied to it. This constant force leads to a constant acceleration, which in turn results in a steady increase in the object's velocity.

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The velocity of the fourth piece after the explosion is 118.5 m/s at 14.7⁰ east of north.

The principle of conservation of linear momentum states that the sum of the initial momentum is equal to sum of final momentum.

Initial momentum of the bomb before explosion is equal to the final momentum of pieces of bomb after explosion.

Pi = Pf

0 = P₁ + P₂ + P₃ + P₄

0 = mv₁ + mv₂ + mv₃ + mv₄

0 = v₁ + v₂ + v₃ + v₄

Consider x-y plane for the velocity of the piece of bomb;

\(0 = (v_1x + v_1y) + (v_2x + v_2_y) + (v_3x + v_3_y) + (v_4_x + v_4_y)\\\\0 = (0 - 50y) + (-80x + 0) + (-40cos30x + 40sin30y) + (v_4_x + v_4_y)\\\\0 = -50y -80x - 34.64x + 20y + v_4_x + v_4_y\\\\0 = -30y - 114.64x + v_4_x + v_4_y \\\\v_4_x + v_4_y = 114.64x + 30y\\\\|v_4| = \sqrt{114.64^2 + 30^2} \\\\|v_4| = 118.5 \ m/s\\\\tan(\theta ) = \frac{30}{114.64} \\\\tan(\theta) = 0.262\\\\\theta = tan^{-1} (0.262)\\\\\theta= 14.7 \ ^0\)

Thus, the velocity of the fourth piece is 118.5 m/s at 14.7⁰ east of north.

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Answer:

static electricity

Explanation:

Answer:

Twice the initial value

Explanation:

Let the current be  = I

      the width of the conducting strips be = a

We know that magnetic field between two plates is given by

\($B=\frac{\mu_0 I}{2\pi r}$\)

If the direction of this magnetic field is same between the two plates, then

\($B=\frac{\mu_0 I}{2\pi r} - \frac{\mu_0 I}{2\pi r}$\)

  = 0

And when the currents runs opposite at each plate, then

\($B=\frac{\mu_0 I}{2\pi r} + \frac{\mu_0 I}{2\pi r}$\)

    \($2 \times B_{initial}$\)

Hence the magnetic field will be twice the initial value of the magnetic field that runs between the plates.

The average velocity of the ball is 1.14 m/s.

Since there is no height given, we can assume that the ball was rolling on a non-inclined surface.

Distance covered by the ball = 18 meters

Time taken by the ball = 15.7 seconds

The velocity of the ball = Distance / Time taken

Velocity= 18/15.7

Velocity= 1.14 m/s

and since there is no initial velocity given, it is the average velocity of the ball.

The distance traveled divided by the time passed is the definition of an object's average speed. Average velocity can be calculated as the displacement divided by the time. Velocity is a vector quantity. The straight line average velocity formulae are invalid for broad scenarios involving non-constant acceleration, hence this definition must be used directly.

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Answer:

The heat necessary to warm 500g of water from 20°C to 65°C is 37,620 J.

Explanation:

GIVEN: m = 500 gm, T₂ = 65°C AND T₁  = 20°C, we know that c (specific heat capacity) = 4180

TO FIND: The heat necessary to warm 500g of water from 20°C to 65°C.

SOLUTION:

By using the heat equation,

              Q=m c ΔT  

             ΔT = T₂ - T1

             ΔT = 65 - 20 = 45°C

In this case,

Q = 0.2 × 4180 × 45 = 37,620 J

Answer:

wave interference

Explanation:

Wave interference is the phenomenon that occurs when two waves meet while traveling along with the same medium. The interference of waves causes the medium to take on a shape that results from the net effect of the two individual waves upon the particles of the medium. To begin our exploration of wave interference, consider two pulses of the same amplitude traveling in different directions along with the same medium.

The optimal heat source distance in a 24-inch diameter and 12-inch deep parabolic space heater is 6 inches from the vertex.

To determine the optimal distance from the vertex for the heat source in a parabolic space heater, we need to consider the focus of the parabola. In a parabolic shape, the focus is located at a distance of half the depth of the parabola from its vertex.

Given that the heater is 12 inches deep, the focus would be located at a distance of 6 inches from the vertex. Therefore, the heat source should be placed 6 inches away from the vertex to maximize the heating output.

By positioning the heat source at the focus, the emitted heat rays will reflect off the parabolic shape and converge towards the desired heating area, maximizing the efficiency and effectiveness of the space heater.

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The period of rotation of the cow in the diagram is 1.85 seconds

First, we shall determine the length. Details below:

L² = 75² + 40²

L² = 5625 + 1600

L² = 7225

Take the square root of both sides

L = √7225

L = 85 cm

Finally, we shall obtain the period of rotation. Details below:

T = 2π√(L/g)

T = (2 × 3.14) × √(0.85 / 9.8)

T = 6.28 × √(0.85 / 9.8)

T = 1.85 seconds

Thus, we can conclude from the above calculation that the period of rotation is 1.85 seconds

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Answer: the period of rotation is 1.85 seconds

Explanation: the other guy is right

Answer:

1.01 W/m

Explanation:

diameter of the pipe d = 30 mm = 0.03 m

radius of the pipe r = d/2 = 0.015 m

external air temperature Ta = 20 °C

temperature of pipe wall Tw = 150 °C

convection coefficient at outer tube surface h = 11 W/m^2-K

From the above, we assumed that the pipe wall and the oil are in thermal equilibrium.

area of the pipe per unit length A = \(\pi r ^{2}\) = \(7.069*10^{-4}\) m^2/m

convectional heat loss Q = Ah(Tw - Ta)

Q = 7.069 x 10^-4 x 11 x (150 - 20)

Q = 7.069 x 10^-4 x 11 x 130 = 1.01 W/m

The heat loss per unit length of tube should be considered as the 1.01 W/m.

Since

diameter of the pipe d = 30 mm = 0.03 m

radius of the pipe r = d/2 = 0.015 m

external air temperature Ta = 20 °C

temperature of pipe wall Tw = 150 °C

convection coefficient at outer tube surface h = 11 W/m^2-K

Now

area of the pipe per unit length A should be

= πr^2

 = 7.069*10^-4 m^2/m

Now

convectional heat loss Q = Ah(Tw - Ta)

Q = 7.069 x 10^-4 x 11 x (150 - 20)

Q = 7.069 x 10^-4 x 11 x 130

= 1.01 W/m

hence, The heat loss per unit length of tube should be considered as the 1.01 W/m.

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Answer:

each resistor draws 1/3 of an amp or 0.33333 amps

Explanation:

V = I * R

V = 10 volts

R = 30 ohms

10 = I * 30       Divide by 30

10/30 = I

I = 0.33333

Answer:

The light traveling in any one direction in a straight line is called a ray of light. A group of light rays given out from a source is called a beam of light.

Explanation:

Candle and electric bulbs. The rays coming out from the candle and electric bulb is divergent beam of light.A beam of light is made up of bundles of closely spaced parallel rays.

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Answer:

The light going in any one course orderly is known as a beam of light. A light beam gathering from a source is known as light emission.

That's the definition of a beam of light.

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Unlocked position. The cam is used to lock the conductor in place, so the locking ring needs to be in the unlocked position in order for the conductor to be passed through the grip head.

A conductor is a person or object that allows the flow of electric current or heat. In electrical systems, a conductor provides a path for the electric current to flow from the power source to the device being powered. In heating systems, a conductor carries the heat from the source to the device or area that needs to be heated. Conductors are typically made of metal, such as copper, aluminum, and silver, as these materials have a higher electrical conductivity than most other materials.

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Owing to the fact that planets orbits the sun at different speeds, Mars and Jupiter does appear to move backwards for some period of time. The geocentric model fails to explain this.

The geocentric model of the solar system is the approach that held the earth rather than the sun as the center of the solar system. The geocentric model was favored by most of the early astronomers.

However, as popular as the geocentric model of the solar system was, it failed to explain the phenomenon of retrograde motion which includes the apparent backward movement of Mars and Jupiter  for some period of time.

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Answer:

My guess is

Explanation:

C or Mars and Jupiter appeared to move backwards for some period of time

B or The stars appeared to move

Sorry if i'm wrong

Answer:

D. All of the above

Explanation:

Because it's the most logical answer.

Ice at 0 degrees celsius is mixed with water at 0 degrees celsius in a perfectly insulated calorimeter.what happens depends on the relative masses of ice and water,some of the ice will melt and the final temperature will be 0 degrees Celsius.So the correct options are 1,2 and 3.

The amount of ice that melts depends on the relative masses of ice and water. If there is more ice than water, then all of the ice will melt. If there is more water than ice, then some of the ice will remain. The final temperature will be 0 degrees Celsius regardless of how much ice melts.

Option 4 is incorrect because the water is already at 0 degrees Celsius, so it cannot freeze. Option 3 is incorrect because heat is not being transferred into or out of the system, so the temperature will not change.Therefore correct option are 1, 2 and 3.

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Answer:

A reference frame is that frame to which the qualities of an object are related:

For instance - an object may described by - mass, speed, acceleration, size,  etc,

It is important to remember that Newton's Laws of motion do not hold in accelerated reference frames -

Einstein's laws of special relativity are only true in frames that move with contant speed to one another