Explain the characteristics of galaxies and galaxy
clusters.

Answer:

A. reflects and absorbs light but does not transmit it

Explanation:

I'm pretty sure it's the first one

Given what we know, we can confirm that the best type of study to determine if daily reading with a parent can increase the speed at which a child learns to read independently is an experimental study.

First, one must design an experiment, in this case, it can be to allow the child to read alone for a week, then measure reading speed. Then repeat this while reading with a parent and measure the speed again. After 2 weeks, compare the results.

Therefore, with an experimental study, one can test the reading speed of the child and determine if it increases when reading with a parent.

To learn more about experiments visit:

https://brainly.com/question/9199868?referrer=searchResults

disadvantages

Explanation:

releases heat when not required

opposes motion

These Milky Way companion galaxies are easily visible from dark locations in the Southern Hemisphere. Prime examples of erratic galaxies are the Large and Small Magellanic clouds (left and right, respectively).

In comparison to a rich cluster, the poor cluster typically has a slightly more erratic shape. A number of smaller galaxies orbit each major spiral. The Small and Large Magellanic clouds are the two most well-known examples of atypical galaxies.

When two galaxies collide, irregular galaxies frequently result. This unusual Cartwheel Galaxy was created when a tiny galaxy slid through the centre of a massive spiral galaxy.

Therefore, Rich clusters are other clusters that include hundreds to thousands of galaxies. A weak cluster can't cling to its members strongly because of its low bulk.

Learn more about galaxies  here:

https://brainly.com/question/8628958

#SPJ2

Answer:

We conclude that the mass of a rock with a force of 500 N and an acceleration of 75 m/s² is 6.7 kg.

Hence, option D is correct.

Explanation:

Given

To determine

Mass m = ?

Important Tip:

Using the formula

\(F = ma\)

where

now substituting F = 500, and a = 75 m/s² in the formula

\(F = ma\)

\(500 = m(75)\)

switch sides

\(m\left(75\right)=500\)

Divide both sides by 75

\(\frac{m\cdot \:75}{75}=\frac{500}{75}\)

simplify

\(m=\frac{20}{3}\)

\(m=6.7\) kg

Therefore, we conclude that the mass of a rock with a force of 500 N and an acceleration of 75 m/s² is 6.7 kg.

Hence, option D is correct.

Answer:

speed is a scalar quantity

because it has magnitude but not the direction

vector quantity have magnitude as well as direction

hope it helps

The maximum amount of time a food worker should take to cool the soup from 70*F to 41*F is 4 hours.The correct answer is b.

According to the FDA's Food Code, potentially hazardous foods must be cooled from 135°F to 70°F within two hours, and from 70°F to 41°F within an additional four hours.Foodborne illnesses can be prevented by the following measures: Cook meat to the correct temperature.

Bacteria that cause foodborne illness can be killed by cooking food to the correct internal temperature. For example, ground beef should be cooked to an internal temperature of at least 160°F. The internal temperature should be checked with a food thermometer.

Take steps to keep the kitchen clean. It's critical to keep the kitchen clean to avoid the spread of bacteria. Countertops, utensils, and cutting boards should all be cleaned with hot soapy water.Routinely rinse fruits and vegetables. Vegetables and fruits should be thoroughly rinsed before consuming to remove any germs or dirt that might be present.

You should wash the produce under running water before cutting or eating it.Avoid cross-contamination. Keep raw meat away from cooked food to prevent contamination. You should never use the same knife or cutting board to cut both raw meat and fresh vegetables.

If you need to use the same cutting board, make sure to clean it thoroughly before reusing it.

Learn more about potentially hazardous foods here:

brainly.com/question/29630696

#SPJ11

Answer:

3.6ft

Explanation:

Using= 2*π*sqrt(L/32)

To solve for L, first move 2*n over:

T/(2*π) = sqrt(L/32)

Next,eliminate the square root by squaring both sides

(T/(2*π))2 = L/32

or

T2/(4π2) = L/32

Lastly, multiply both sides by 32 to yield:

32T2/(4π2) = L

and simplify:

8T²/π²= L

Hence, L(T) = 8T²/π²

But T = 2.1

Pi= 3.14

8(2.1)²/3.14²

35.28/9.85

= 3.6feet

The electrical resistivity of a material is a measure of how strongly it resists the flow of electric current.  The electrical resistivity of pure tantalum wire at room temperature (20°C) is approximately 78.68 μΩ·cm.

To calculate the electrical resistivity at room temperature (20°C), we can use the given resistivity values at 100K and 160K.

Step 1: Convert the given temperatures from Kelvin to Celsius.
100K = -173°C
160K = -113°C

Step 2: Find the change in resistivity per degree Celsius.
Change in resistivity = resistivity at 160K - resistivity at 100K
Change in resistivity = 65 μΩ·cm - 35 μΩ·cm = 30 μΩ·cm

Step 3: Find the change in temperature.
Change in temperature = 20°C - (-113°C) = 133°C

Step 4: Calculate the change in resistivity per degree Celsius.
Change in resistivity per degree Celsius = Change in resistivity / Change in temperature
Change in resistivity per degree Celsius = 30 μΩ·cm / 133°C

Step 5: Find the change in resistivity for 1°C.
Change in resistivity for 1°C = Change in resistivity per degree Celsius * 1°C
Change in resistivity for 1°C = (30 μΩ·cm / 133°C) x 1°C

Step 6: Calculate the resistivity at 20°C.
Resistivity at 20°C = resistivity at 100K + (Change in resistivity for 1°C x (20°C - (-173°C)))

Now, let's calculate the resistivity at 20°C using the given values.

Resistivity at 20°C = 35 μΩ·cm + [(30 μΩ·cm / 133°C) x (20°C - (-173°C))]

Calculating the above expression, we get:

Resistivity at 20°C = 35 μΩ·cm + [(30 μΩ·cm / 133°C) x 193°C]

Resistivity at 20°C = 35 μΩ·cm + [(30 μΩ·cm / 133°C) x 193°C]

Resistivity at 20°C = 35 μΩ·cm + 43.68 μΩ·cm

Resistivity at 20°C = 78.68 μΩ·cm

Conclusion , The electrical resistivity of pure tantalum wire at room temperature (20°C) is approximately 78.68 μΩ·cm.

To know more about temperature visit:

https://brainly.com/question/7510619

#SPJ11

Answer:

The answer is "A"

Hope it helps u! :D if it helps, make me the brainliest pls :) (if you want!)

Answer:

5 cm.

Explanation:

If the glass is located upright, the height of water is about 5 cm because the height of glass is 10 cm and it is partially filled with water and we know that partial means 50 percent of something and here 50 percent of glass is 5 cm. If the glass is slightly bend, so we can't find its right height so the proper height of water is attain if it is placed on flat table and present upright.

the parameters of the equivalent circuit of the given transformer are;

R_1 = 533.33 Ω, R_0 = 93.33 Ω, R_2 = 1.44 Ω, X_1 = 226.67 Ω, X_0 = 40 Ω, X_2 = 16.2 Ω.

Transformer rating, kVA = 6 Voltage ratio, V1 / V2 = 200 / 400

Primary voltage, V1 = 200V

Frequency, f = 50Hz

For Open Circuit test:

Primary voltage, V1 = 200V

No-load current, Io = 0.75A

Power, W = 75W

For Short Circuit test:

Primary voltage, V1 = 18V

Secondary current, I2 = 12.5A

Power, W = 60W

As the voltage ratio is 2:1, the turns ratio (

a) is 1:√2. Number of turns in the primary, N1 = kV1/√2

Number of turns in the secondary, N2 = kV2/√2

                                                               =6 × 400/√2

                                                               =1697.1 turns

Equivalent circuit parameters can be found as follows:

Calculation of R_1,R_0,R_2,X_1,X_0 and X_2 is as follows;

Calculation of R_1:I_1 =(W_0/V_1)

                                  = 75/200

                                  = 0.375AR_1

                                  = (V_1/I_1)

                                  = (200/0.375) Ω

                                  = 533.33 Ω

Calculation of R_0:

R_0 = ((V_1/I_0)-R_1)

       = ((200/0.75) - 533.33) Ω

       = 93.33 Ω

Calculation of R_2:

R_2 = (V_2/I_sc)

      = (18/12.5) Ω

      = 1.44 Ω

Calculation of X_1:

X_1 = [(V_1/I_m) - R_1]

      = [(200/0.667) - 533.33] Ω

      = 226.67 Ω

Calculation of X_0:

X_0 = [(V_1/I_0) - R_0]

       = [(200/0.75) - 93.33] Ω

       = 40 Ω

Calculation of X_2:

X_2 = [(V_2/I_m) - R_2]

      = [(18/0.888) - 1.44] Ω

      = 16.2 Ω

Let us write the equivalent circuit diagram:

Total resistance on the primary side of transformer:

Total resistance on the secondary side of transformer

To learn more on resistance:

https://brainly.com/question/28135236

#SPJ11

Based on the relationship between power and time, the time required is 10.67 seconds

Force produced by the car = mass × acceleration

Force produced by the car engine = 30 kW = 3000 kW

mass of car = 800 Kg

acceleration of car = changein velocity / time

acceleration = 110 - 70/t = 40/t

3000 = 800 × 40/t

t = 32000/3000

time, t = 10.67 seconds

Therefore, the time required is 10.67 seconds

Learn more about time taken at: https://brainly.com/question/4931057

(a) The acceleration of the masses is determined as 1.1 m/s² in the direction of the 5 kg mass.

(b) The tension in the string in terms of gravity is T = g.

(a) The acceleration of the masses is calculated by applying Newton's second law of motion.

F(net) = ma

where;

(5 kg x 9.8 m/s² ) - (1 kg + 3 kg )9.8 m/s² = ma

9.8 N = (5kg + 1 kg + 3 kg )a

9.8 = 9a

a = 9.8 / 9

a = 1.1 m/s² in the direction of the 5 kg mass.

(b) The tension in the string in terms of gravity is calculated as follows;

T = ( 5kg)g - (1 kg + 3 kg ) g

T = 5g - 4g

T = g

Learn more about tension in string here: https://brainly.com/question/24994188

#SPJ1

Answer:

it's true I'm pretty sure

Answer:

the answer is true.I'm sure

As the air is compressed, the work done on the air causes its temperature to increase.

What is Thermodynamic Process?

A thermodynamic process is a physical change that occurs in a system as it exchanges heat and/or work with its surroundings. It involves a change in one or more thermodynamic variables, such as temperature, pressure, volume, or entropy. There are four main types of thermodynamic processes: isothermal, adiabatic, isobaric, and isochoric.

When we blow air with our mouth narrow open, we feel the air cool because of the adiabatic expansion of the air. Adiabatic expansion is a thermodynamic process in which the air expands rapidly without losing or gaining any heat to or from the surroundings. As the air expands, it does work against the pressure of the surrounding atmosphere, and this work causes the temperature of the air to decrease. This is known as the Joule-Thomson effect.

On the other hand, when the mouth is made wide open, we feel the air warm because of the adiabatic compression of the air. Adiabatic compression is a thermodynamic process in which the air is compressed rapidly without losing or gaining any heat to or from the surroundings.

Learn more about Thermodynamic Process from given link

https://brainly.com/question/30190815

#SPJ1

The linear speed of a unit mass located at the inner equator of the sphere is approximately 2401.07 meters per second.

The linear speed \((\(v\))\) of a unit mass located at the inner equator of a sphere can be calculated using the formula for linear speed in a circular motion:

\(\rm \[v = \frac{{2\pi r}}{T}\]\)

where:

r = Radius of the sphere (distance from the center to the equator)

T = Time taken for one complete revolution (orbital period)

In this case, we are considering the inner equator of the sphere, which means the radius r is the same as the mean radius of the sphere. Let's denote the mean radius as \(\rm \(R_{\text{mean}}\)\).

Given:

\(\rm \(R_{\text{mean}} = 3.40 \times 10^6 \, \text{m}\)\) (given the mean radius of Mars)

The time taken for one complete revolution T can be calculated using the orbital period of Mars, which is approximately 24.6 hours. Let's convert it to seconds:

\(\rm \(T = 24.6 \, \text{hours} \times 3600 \, \text{s/hour}\\= 8.856 \times 10^4 \, \text{s}\)\)

Now, let's calculate the linear speed v:

\(\rm \[v = \frac{{2\pi R_{\text{mean}}}}{T} \\\\= \frac{{2\pi \times 3.40 \times 10^6 \, \text{m}}}{{8.856 \times 10^4 \, \text{s}}} \\\\\approx 2401.07 \, \text{m/s}\]\)

The linear speed of a unit mass located at the inner equator of the sphere is approximately 2401.07 meters per second.

Know more about circular motion:

https://brainly.com/question/20359929

#SPJ12

this question is centered around newtons second law f=ma

First you need to find the acceleration

\( acceleration = \frac{8 - 0}{22} \)

that gives you 0.36 recurring(on both numbers) m/s²

mass= force ÷ acceleration

\( mass = \frac{31}{0.36recurring} \)

mass= 85.25 kg

if you want to check

f=ma

85.25 × 0.36 recurring (remember its on both numbers not just 6) = 31 N

Answer:

Explanation:

Givens

F = 31 N

vi = 0

vf = 8 m/s

t = 22 seconds

m = ?

Formula

F = m ( vf - vi)/t

Solution

31 = m (8 - 0) / 22             Multiply both sides by 22

31 * 22 = 8 * m

8m = 682                          Divide by 8

m = 682 / 8

m = 85.25

The magnitude of the net force on particle Q₂ is  6.487 x 10⁶ N.

The net force on particle Q₂ is obtained by applying Coulomb's law of electrostatic force.

Force between Q₁ and Q₂;

F₁₂ = kq₁q₂/r²

where;

F₁₂ = (9 x 10⁹ x 20.5 x 10⁻³ x 9.3 x 10⁻³)/(0.98)²

F₁₂ = 1.787 x 10⁶ N

Force between Q₂ and Q₃;

F₂₃ = kq₂q₃/r²

F₂₃ = (9 x 10⁹ x 9.3 x 10⁻³ x 31.6 x 10⁻³)/(0.75)²

F₂₃ = 4.7 x 10⁶ N

The net force on particle Q₂;

F(net) = F₁₂ + F₂₃

F(net) = 1.787 x 10⁶ N +  4.7 x 10⁶ N

F(net) =  6.487 x 10⁶ N

Learn more about net force here: https://brainly.com/question/14361879

#SPJ1

Answer: Reflecting telescopes focus light with a series of mirrors, while refracting telescopes use lenses.

Explanation:

Answer:

The student that says the phrase "travels through liquids" goes in the middle, in between the two circles in the venn diagram.

Explanation:

The earth tilt about 23 degrees which leads to the formation of seasons on earth.

This is tilted at 23 degrees from the vertical. The northern hemisphere is in the winter season.

This is the path as the earth revolves around the sun. It takes 1 year to complete this path.

This is the path as the earth rotates around its.

So we can conclude that the earth tilt about 23 degrees which leads to the formation of seasons on earth.

Learn more about season here: https://brainly.com/question/25870256

#SPJ1

Answer: Heating from the crust and mantle.

Explanation: Tremendous heat and pressure within the earth cause the hot magma to flow in convection currents. These currents cause the movement of the tectonic plates that make up the earth's crust.

The convection currents that cause this cycle to take place is driven by heating from the crust and mantle. Hence, option (a) is correct option.

A crucial idea that illustrates the changes between the three primary rock types is the "rock cycle" (metamorphic, igneous and sedimentary). Simply put, it is a series of processes that create and modify the various types of rocks found in the Earth's crust.

The solid crust of Earth serves as a heat insulator for the planet's warm interior. The molten rock in the mantle, below the crust, is known as magma. Convection currents are created by the intense heat and pressure that exists within the earth. The tectonic plates that make up the earth's crust shift as a result of these currents.

Learn more about rock cycle here:

https://brainly.com/question/29767269

#SPJ2

The bug has the greater acceleration because it has the smaller mass

The bug has a greater change in velocity (acceleration) due to experiencing equal force as a much smaller mass.

The rate at which the speed and direction of a moving object vary over time. A point or object going straight ahead is accelerated when it accelerates or decelerates.

Learn more about Acceleration here:

https://brainly.com/question/460763

#SPJ4

Answer:

D. If you spend more time in the sun, your skin will become drier.

Explanation:

i mean think about it. also i just took the test and got it right so there u go.

Complete Question:

Two solid rods have the same length and are made of the same material with circular cross sections. Rod 1 has a radius r, and rod 2 has a radius r / 2. If a compressive force F is applied to both rods, their lengths are reduced by ΔL1 and ΔL2, respectively. The ratio ΔL1 / ΔL2 is equal to.

Answer:

\(\frac{\triangle L_1}{\triangle L_2} =\frac{1}{4}\)

Explanation:

Since the two rods have the same length, L₁ = L₂ = L

Radius of rod 1, r₁ = r

Radius of rod 2, r₂ = r/2

Cross sectional area of rod 1, \(A_1 = \pi r^2\)

Cross sectional area of rod 2, \(A_2 = \frac{\pi r^2}{4}\)

The same compressive force is applied to the two rods, F₁ = F₂ = F

The rods are said to be made of the same material, this means that they have the same young's modulus.

Young's modulus of rod 1, \(Y_1 = \frac{FL}{A_1 \triangle L_1}\)

Young's modulus of rod 2, \(Y_2 = \frac{FL}{A_2 \triangle L_2}\)

Since Y₁ = Y₂

\(\frac{FL}{A_1 \triangle L_1} = \frac{FL}{A_2 \triangle L_2}\\\\ \frac{1}{A_1 \triangle L_1}= \frac{1}{A_2 \triangle L_2}\\\\\)

\(\frac{\triangle L_1}{\triangle L_2} = \frac{A_2}{A_1}\\\)..............(*)

Put A₁ and A₂ into (*)

\(\frac{\triangle L_1}{\triangle L_2} = \frac{\pi r^2/4 }{\pi r^2}\\\\\frac{\triangle L_1}{\triangle L_2} =\frac{1}{4}\)