What will the temperature of the cosmic microwave background be when the average distances between galaxies are 1.2 times as large as they are today

Answer:

1.9976 m

Explanation:

An iron bar whose initial length is 2m has its temperature increased from 20 ° C to 120 ° C. What is the final length of the bar? (consider that the coefficient of expansion of iron) is 1.2 x 10-5 1 / ° C (3 points)

Given that,

Initial length of an iron bar, \(L_0=2\ m\)

The temperature increased from 20°C to 120°C

The coefficient of expansion of iron is \(1.2\times 10^{-5}\ /^{\circ} C\)

We need to find the final length of the bar.

The linear expansion equation is given by :

\(\Delta L=\alpha L\Delta T\)

Where \(\Delta L\) is the change in length

\(\Delta L=1.2\times 10^{-5}\times 2\times (120-20)\\\\=0.0024\ m\)

Also, \(\Delta L = L_o-L\)

L is final length

\(0.0024= 2-L\\\\L=2-0.0024\\\\=1.9976\ m\)

So, the final length of the bar is 1.9976 m

Answer:

The pressure difference required between the two ends of the 1.6 km pipe section, with a diameter of 29 cm, to transport the oil at a rate of 650 cm^3/s, is approximately 0.398 Pa.

Explanation:

To calculate the pressure difference between the two ends of a pipe, we can use the Poiseuille's Law equation, which relates flow rate, viscosity, pipe length, diameter, and pressure difference.

The formula is as follows: ΔP = (8 * n * L * Q) / (π * r^4)

Where:

ΔP is the pressure difference,

n is the viscosity of the fluid,

L is the length of the pipe section,

Q is the flow rate,

and r is the radius of the pipe (half of the diameter).

Given:

L = 1.6 km = 1600 m (convert to meters)

Diameter = 29 cm

Radius (r) = 29 cm / 2 = 14.5 cm = 0.145 m (convert to meters)

Q = 650 cm^3/s = 650 * 10^-6 m^3/s (convert to cubic meters per second)

n = 0.20 Pa.s (viscosity)

p = 950 kg/m^3 (density)

ΔP = (8 * 0.20 * 1600 * 650 * 10^-6) / (π * (0.145)^4)

ΔP ≈ 0.398 Pa

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Answer:

by movement of the bones of the middle ear and by differences in the surface area of the eardrum versus the oval window.

Explanation:

An umbrella tends to move upwards on a windy day principally because air pressure is reduced over the curved top surface. The correct option is C) air pressure is reduced over the curved top surface.

 An umbrella is a lightweight object that can easily be lifted off the ground due to its shape. An umbrella has a curved top surface that creates an area of low pressure above it when air flows around it. This low-pressure region creates a suction-like effect that lifts the umbrella up into the air.

The Bernoulli effect describes this phenomenon, in which air pressure decreases as wind speed increases over a curved surface. When wind flows over the top of the umbrella, it must travel farther and faster than the wind flowing underneath it. As a result, air pressure decreases over the top of the umbrella, causing the umbrella to lift off the ground.Another factor that affects the movement of an umbrella on a windy day is wind direction. The angle at which the wind strikes the umbrella is also critical. Wind direction is another factor that affects how an umbrella moves.

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A ship travels a distance of 140 km in the direction of the current in 4 hours, and against the current in 8 hours, the speed of the river current is  8.75 km/h.

To determine the speed of the river current, we need to consider the distance traveled by the ship between two ports along the river, which is 140 km, the time taken to travel in the direction of the current (4 hours), and against the current (8 hours).

First, let's find the ship's speed in both directions. The speed in the direction of the current can be calculated as 140 km / 4 hours = 35 km/h, and the speed against the current can be calculated as 140 km / 8 hours = 17.5 km/h.

Now, let's denote the ship's speed in still water as 's' and the speed of the river current as 'c'. The formula for the ship's speed in the direction of the current is (s + c) and against the current is (s - c).

Using the given information, we can create two equations:

1. s + c = 35 km/h
2. s - c = 17.5 km/h

By adding both equations, we can eliminate 'c' and solve for 's':

s + c + s - c = 35 + 17.5
2s = 52.5
s = 26.25 km/h

Now, we can use 's' to find the speed of the river current by substituting it in either equation, let's use equation 1:

26.25 + c = 35
c = 35 - 26.25
c = 8.75 km/h

So, the speed of the river current is 8.75 km/h.

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Answer:

A) x4

Explanation:

Magnification is equal to image size divided by the actual size, or M = I/A.

The image size is the student's drawing, which is 28.8 cm, and the actual size is 7.2 cm. Divide them, and cancel out the units, and you should get:

28.8 cm/7.2 cm = 4

Answer:

just awnsered this one your awnser is the the second option

Answer:

answer one

Explanation:

The - 1A and 2A, - 2A and 2B two domains/subdomains of the Rec B subunit are involved in the typical helicase motor domain activity.

The Rec BCD enzyme has two distinct helicase motor domains that display typical activity.

The following two domains/subdomains of the Rec B subunit are involved in the typical helicase motor domain activity:
- 1A and 2A
- 2A and 2B
Rec BCD is a complex enzyme that contains three subunits: Rec B, Rec C, and Rec D.

The Rec B subunit has two Rec A-like helicase domains, one at the N-terminus (domains 1A and 1B) and the other at the C-terminus (domains 2A and 2B).

Domain 1A is thought to play a role in DNA binding, while domain 1B may play a role in enzyme regulation.
The motor activity of Rec B is mainly due to domains 2A and 2B.

They are responsible for the unwinding of double-stranded DNA, while domains 1A and 1B contribute to the processivity of the enzyme.

The motor activity of Rec B is primarily directed towards unwinding the DNA ahead of the enzyme, with Rec D following behind to degrade the DNA.
In summary, the domains/subdomains of the Rec B subunit that display typical helicase motor domain activity are 1A and 2A and 2A and 2B.

Rec BCD is a multifunctional nuclease-helicase enzyme that initiates the repair of DNA breaks.

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Answer:

How does the work done on a machine compare to the work done by a machine? Because of friction, the work done by a machine is always less than the work done on the machine. What changes can a machine make to a force? Size of force; direction of force; distance through which a force acts.

The maximum energy radiated by the sun occurs at a wavelength of approximately 520 nm.

The wavelength at which the maximum energy is radiated by an object can be determined using Wien's displacement law. According to this law, the peak wavelength (λmax) is inversely proportional to the temperature of the radiating object.

Wien's displacement law is expressed as:

λmax = b / T

Where:

λmax is the peak wavelength,

b is Wien's displacement constant (approximately 2.898 × 10⁻³ m·K),

T is the temperature in Kelvin.

Given that the surface temperature of the sun is approximately 5,800 K, we can calculate the peak wavelength using the equation:

λmax = (2.898 × 10⁻³ m·K) / (5,800 K)

Calculating this:

λmax ≈ 499.66 nm

Therefore, the peak wavelength, at which the maximum energy is radiated by the sun, is approximately 499.66 nm. Rounded to the nearest whole number, the answer is 500 nm, which is closest to the given option of 520 nm.

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Answer:

40cm³

Explanation:

I only have an answer to 1a

Volume = Length X breadth X height

where;

length = 10cm

breadth = 2cm and;

width = 2cm

*Find*

V = ?

V = L X B X H

V = 10 X 2 X 2

= 40cm³✓

The horizontal acceleration of the softball after she lets go of the ball is  0 m/s².

option B is the correct answer.

During a projectile motion, the vertical acceleration of a projectile decreases as the projectile moves upwards and eventually become zero as the object reaches the maximum height.

As the object begins move downwards, the vertical velocity of the projectile increases and eventually becomes maximum before the object hits the ground.

During the horizontal motion of a projectile, the horizontal velocity of the projectile does not change. That is the initial horizontal velocity of the projectile equals the final horizontal velocity of the projectile.

a = v - u/t

where;

Since, final horizontal velocity = initial horizontal velocity, then horizontal acceleration = 0 m/s²

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The amount of metal in a closed cylindrical can that is 10 cm high and 4 cm in diameter if the metal on the top and the bottom is 0.1 cm thick and the metal on the sides is 0.05 cm thick is 8.8 cm.

The formula for calculating the volume of a cylinder is given below.

V = πr^2 h

Get the differential of the volume as shown:

dV = V/ h dh + V / r dr

V/ h = πr^2

V/ h  = 2  πr h

Now, the differential becomes

dV =  πr^2dh +  2πrh dr

Given the following parameters

dh = 0.1 + 0.1 = 0.2 cm

dr = 0.05 cm

h = 10 cm

r = 4 cm

Substituting the values in the above equation, we get

dV = 3.14(2)^2(0.2)  + 2(3.14)(2)(10)(0.05)

dV = 2.512 + 6.28

dV = 8.792 cm

dV = 8.8 cm

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Q3. By using Newton's Divided Difference interpolation, the value of y when x=3 can be determined.

Q4. Using Lagrange's Interpolation method, the value of y can be determined for x=13 from the given data.

Interpolation methods are used to estimate the value of a dependent variable (in this case, y) when the independent variable (x) falls between two known data points. Newton's Divided Difference interpolation and Lagrange's Interpolation method are two commonly used techniques for this purpose.

To find the value of y when x=3 using Newton's Divided Difference interpolation, we can use the given table of data points and interpolate a polynomial function that fits the data. The coefficients of this polynomial can be determined using the divided difference formula. By substituting x=3 into the interpolated polynomial, we can calculate the corresponding value of y.

using Lagrange's Interpolation method, we can also determine the value of y for x=13. This method involves constructing a polynomial function that passes through the given data points. By using the Lagrange interpolation formula, which is based on weighted averages, we can calculate the value of y for the desired x=13.

Interpolation methods are valuable tools in data analysis, curve fitting, and prediction. They allow us to estimate values within a range based on known data points. By utilizing these techniques, we can make informed predictions and fill in missing information between data points.

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ANSWER:

STEP-BY-STEP EXPLANATION:

Explanation:

Alkanes are hydro carbons with single bonds.

Alkane are in haemologlous series.

Propane have three carbon atoms surrounded

hyroden atom.

Molecular formula for propane= C3H8

Answer:

50volts

Explanation:

Each of the resistance is 10ohms. 2 in series and 2 in parallel. it means the 2 parallel can combines with total of 10×10÷(10+10)= 5ohms and combine in series with 10ohms which is 10+10+5= 25ohms. in series connection, we have same current flowing. therefore the voltage source will be 25ohms × 2amps = 50volts

Answer: false.

Explanation:

Doppler effect is caused to the relative motion of the source of light/sound with respect to the observer.

If the source is moving towards you, you will perceive the frequency to be larger (also called a blue shift), while if the wave is moving away, you will perceive the frequency to be smaller (also called a red shift).

Then the statement:

"Doppler effect is caused by sound or light wave being pushed together and spread apart due to motion."

Is false

Answer:

To the left side.

Explanation:

The teddy bear will move towards the left side because more force is applied by scout and sparky than dusty. The reason for this movement of teddy bear  to the left is due to more force is applied by the two dogs present at the left side of the teddy bear while on the other hand, one dog is present at the right side of teddy bear which applied less force so that's why we can say that the teddy bear moves to the left side rather than to the right side.

I would use this strategy in the following ways:

Strategy is  described as a general plan to achieve one or more long-term or overall goals under conditions of uncertainty.

We have three levels of strategy and they include:

By Observing my  environment or what is there around me  that can help me, it will help me overcome any obstacle that may come my way.

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Answer:

Explanation:

For every action (or force), there is an equal and opposite action (or force).

The kinetic energy of the ball the instant it hits the floor is 100J.

Energy is a unit used to describe how much work a body can perform. It cannot be created or gotten rid of. Energy comes in a variety of forms, including thermal, electrical, nuclear, electrical fusion, and electrical. Energy has the capacity to take on different forms.

The ball's potential energy when it is on a shelf is 100 J.

The ball's potential energy from gravity begins to transform into kinetic energy as it begins to fall. Additionally, as the ball falls, its kinetic energy will rise and its potential energy will fall.

The ball's potential energy due to gravity is completely transformed into kinetic energy when it strikes the ground.

Therefore, the ball has 100 J of kinetic energy when it strikes the ground.

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Answer: Innovations originally designed for space vehicles, including artificial muscle systems, robotic sensors, diamond-joint coatings, and temper foam,

Explanation: make artificial human limbs more functional, durable, comfortable, and life-like.

False. A concave lens refracts parallel rays in such a way that they are bent towards the axis of the lens, making it a converging lens.

A concave lens is a lens that has a curved surface that is curved inward, like the inside of a bowl. It is also known as a negative or diverging lens. Light that passes through a concave lens is spread out, or diverged, which causes the image to appear smaller than the actual object. Concave lenses are commonly used in eyeglasses and are used to correct nearsightedness, or myopia. They can also be used in projectors and cameras to focus light and create a sharper image.

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How to convert m/sec into km/hr

1 m = 1/1000 km; 1 sec = 1/3600 hr

1 m/sec = 3600/1000 km/hr = 18/5 km/hr

To convert m/sec into km/hr, multiply the number by 18 and then divide it by 5.

Need detail explanation? Go to bottom

Solved Example 1:

Convert 20 m/sec into km/hr.

Solution:

20 m/sec

Step 1:

Multiply 20 by 18

We have 20 * 18 = 360

Step 2:

Divide 360 by 5

360/5 = 72

Final Answer:

20 m/sec = 72 km/hr

Try yourself: Practice Sheet 1

Solved Example 2:

Convert 36 m/sec into km/hr.

Solution:

36 m/sec

Step 1:

Multiply 36 by 18

We have 36 * 18 = 648

Step 2:

Divide 648 by 5

648/5 = 129.6

Final Answer:

36 m/sec = 129.6 km/hr

Try yourself: Practice Sheet 2

Better Understanding:

The problem can be solved using an unitary method.

A shopkeeper sells each pencil for 5 cents. How much do 4 pencils cost? 4 * 5 cents= 20 cents, isn't it? What is the cost of 7 pencils? Yes, your guess is right. It is 7 * 5 cents = 35 cents.

Let us work out the problem in example 1 as it explained here.

20 m/sec = 360/5 = 72 km/hr

Answer:

Having gained this energy during its acceleration, the body maintains this kinetic energy unless its speed changes. The same amount of work is done by the body when decelerating from its current speed to a state of rest. Tell me if u need any more help, have a goooood dayyyyy and pls mark brainly

Explanation:

Answer:

the bag DOES NOT BREAK,  F = 59 N

Explanation:

For this exercise, let's use Newton's second law, let's set a reference frame with the positive direction up

           F -W = m a

the mass of the groceries is m = 5 kg, the weight is

           W = m g

indicate the acceleration a = 2 m / s², let's find the force

          F = mg + ma

          F = m (g + a)

let's calculate

          F = 5 (9.8 + 2)

          F = 59 N

          F <65 N

as the force with which it pulls the bag less than the breaking force the bag DOES NOT BREAK

Answer:

Height, speed, mass

Explanation:

Answer:

D height, speed, mass

Explanation:

I took this test early november

We can see here that the textures of objects play a significant role in determining the friction produced when two objects are in contact with each other.

Friction is a force that opposes the relative motion or attempted motion between two surfaces in contact. When two objects are in contact and one tries to slide, roll, or move past the other, friction acts in the opposite direction to resist or impede that motion.

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Answer:

The answer is below

Explanation:

Charlee's law states that the volume of a gas is directly proportion to the temperature of the gas at constant pressure. That is:

V = kT, where V = volume and T = temperature, k = constant. Therefore:

V / T = k

\(\frac{V_1}{T_1}=\frac{V_2}{T_2}\)

Given that: \(V_1=3\ m^3, T_1=20^oC=(20 + 273)K=293\ k,T_2=60^oC=(60 + 273)K=333\ k.\\\\\frac{V_1}{T_1}=\frac{V_2}{T_2}\\\\\frac{3}{293}=\frac{V_2}{333} \\\\V_2=\frac{3}{293}*333\\\\V_2=3.41\ m^3\\\)

The new volume is 3.41 m³. That is it expands by 0.41 m³

Answer:

0.02484

Explanation:

Trust me bro