If Janie puts her hand on a cold metal doorknob, how will thermal energy move?

A- Cold moves from the doorknob to her hand.
B - Heat moves from her hand to the doorknob.
C- Heat moves from the doorknob to her hand.
D- Cold moves from her hand to the doorknob.

Answers

Answer 1

Answer:

it is b or c

Explanation:

Answer 2

Answer:

The answer is B I did the test.

Explanation:

I hope it helps!


Related Questions

một trái banh đỏ được ném lên từ mặt đất với vận tốc ban đầu 25m/s . cùng lúc đó 1 trái banh xanh được thả xuống từ tầng ba của tòa nhả độ cao 15m. hỏi sao bao lâu 2 trái banh đạt cùng độ sao so với mặt đất

Answers

Answer:

Hshahahjahajjajjajaisjsjs


A student wants to conduct an experiment to determine the rate at which windows transfer energy to the outside air in the winter. The student investigates windows that are made from two parallel
pieces of class with a space in between as shown in the figure. The student decides to investigate how the spacing between the pieces of glass affects the transfer of energy. Which additional
criteria should the student use when selecting windows for the experiment? Select two answers.

A
Select Windows with different areas

B
Select Windows with the space between the pieces of glass filled with different gases

C
Select windows with pieces of glass made from the same type of glass.

D
Select windows with pieces of glass made from the same thickness of glass,

Answers

The characteristics of thermal conductivity and thermal insulation allow finding the correct answers for the window length study experiment to be correct are:

      C.  Select windows with pieces of glass made from the same type of glass.

      D.  Select windows with pieces of glass made from the same thickness of glass,

Thermal transfer processes are determined by the characteristics of the materials and their way of construction, but all of them can be described by the expression.

                [tex]P = \frac{A}{R} \Delta T[/tex]  

                [tex]R = \frac{L}{k}[/tex]  

where P is the heat flux, A the area of ​​the windows, ΔT the variation in temperature, R is the insulating value of the material, L is the length of the compound and k the thermal conductivity.

Let's examine the criteria that the student must have for the experiment to be repetitive and to be able to compare the results, let's examine the different responses:

A) False. The flow is proportional to the area, so to be able to compare the results, all the windows must have the same area.

B) False. This possibility is interesting, but it is difficult to maintain the different atmosphere besides being expensive, gases in normal conditions have very similar properties.

C) True. The thermal conductivity of different glasses changes a lot, so there should not be different glass in the windows.

D) True. The constant R is proportional to the thickness of the glass, so it is essential that all windows have the same thickness glass.

In conclusion, using the characteristics of thermal conductivity and thermal insulation, we can find that the correct answers for the window length study experiment to be correct are:

     C.  Select windows with pieces of glass made from the same type of glass.

      D.  Select windows with pieces of glass made from the same thickness of glass,

Learn more here: brainly.com/question/23812426

the speed of the water at the tap of lower storey is more than that in the upper storey,why?
write in one sentence.

Hurry up​

Answers

With lower, the mechanics have to work harder to give water. Resulting in faster spray. But with upper, they do not have to work as hard which makes it not work as fast.

What is also a product in the chemical reaction of fusion?
A. Energy
B. Water
C. Sugar
D. Carbon dioxide

Answers

Answer:

D.

Explanation:

A

because energy is also a product

If there is a 25 [lbs] of force acting on a 5 [lbs] of mass, what is the acceleration of that mass?

Answers

Answer:

f = 25 lbs

m = 5 lbs

a =?

f = ma

25 = 5 a( divide both sides by 5)

a = 5(lbs)


A 0.56 kg block is suspended from the middle
of a 1.74 m long string. The ends of the string
are attached to the ceiling at points separated
by 1 m, and the block can slip along the long
string
The acceleration of gravity is 9.81 m/s?.
What angle does the string make with the
ceiling?

Answers

Notice that both strings have the same length, so they form an isosceles triangle, which means the angles they make with the ceiling are congruent.

If this angle has measure θ, then the angle between the two strings T₁ and T₂ has measure 180° - 2θ. This is because the interior angles of any triangle sum to 180°.

By the law of cosines, we have

(1 m)² = (0.87 m)² + (0.87 m)² - 2 (0.87 m)² cos(180° - 2θ)

Solve for θ :

(1 m)² = 2 (0.87 m)² - 2 (0.87 m)² cos(180° - 2θ)

(1 m)² / (2 (0.87 m)²) = 1 - cos(180° - 2θ)

cos(180° - 2θ) = 1 - (1 m)² / (2 (0.87 m)²)

cos(180° - 2θ) ≈ 0.3394

180° - 2θ = arccos(0.3394)

180° - 2θ ≈ 70.159°

2θ ≈ 109.841°

θ ≈ 54.9205° ≈ 55°

Your new motorcycle weighs 2580 N.
The acceleration of gravity is 9.8 m/s2.
What is its mass?
Answer in units of kg.

Answers

Answer:

205 kilograms.

answer ok :)

Why would it be better to record larger forces when trying to determine the frictional coefficient between two objects?​

Answers

Frictional coefficient comes with vale like 0.3/0.1 and such like imaginable values almost all times.So it can be negligible .However it makes the calculation more complex.so it's better to record larger forces.

a force is represented by a ____ the choice of a ____ is necessary​

Answers

Answer:

a force is represented by a vector the choice of a reference frame is necessary​

Explanation:

simple daily routine ? also add habits to make it healthier

Answers

Get 8 to 10 hours of sleep every night, eat a healthy diet, exercise, don’t spend too much time on social media, help others, reach out to friends and family, have a positive mindset, and be open minded

What do you think? Is absolute zero really colder
than outer space?

Answers

Answer:

yes zero colder enough

Explanation:

for temperature ^_^^_^

Scenario: A sheet of paper is hung in the air, and a boxer punches it.
Which experiences a greater force?
The boxer, the paper, or both ???

Answers

Answer:

the paper

Explanation:

What does the scientific method help test in environmental science?

Edmentum/Plato answer please

Answers

Answer:

The scientific method helps test and arrive at conclusions for a variety of hypotheses that are created when studying environmental science.

Explanation:

What is the scientific method in environmental science?

The scientific method is a method of research with defined steps that include experiments and careful observation. One of the most important aspects of this method is the testing of hypotheses by means of repeatable experiments. A hypothesis is a suggested explanation for an event, which can be tested.

Por una tuberia de 2.65 cm de diámetro fluye agua con una velocidad de 5 m/s; en una parte de la
tuberia hay una reducción en su diámetro de 0.65 cm. ¿Qué velocidad llevará el agua en este punto?

Answers

La ecuación de continuidad podemos encontrar el resultado para la velocidad de fluido en la reducción de la tubería es:

       v = 83,1 m/s

La mecánica de fluidos estudia el movimiento de líquidos y gases por diferentes sistemas, la conservación de la masa  es escrita como la ecuación de continuidad

            A₁ v₁ = A₂ v₂

Donde  los subíndices son en dos puntos de interés, A el área de la tubería y v la velocidad del fluido.

Indican la velocidad de fluido es v₁ = 5 m/s y el diámetro de la tubería es d₁= 2,65 cm, piden encontrar la velocidad en la parte con un diámetro de d₂ = 0,65 cm

El área de la tubería es

         A = [tex]\pi ^r^2 = \pi \frac{d^2}{4}[/tex]  

         [tex]v_2 =\frac{A_1}{A_2} \ v_1 \\v_2 = ( \frac{d_1}{d_2} )^2 \ v_1[/tex]  

Calculemos

       v₂ =  [tex]( \frac{2.65}{0.65} )^2 \ 5[/tex]  

       v₂ =  83,1 m/s

En conclusión usando la ecuación de continuidad podemos encontrar el resultado para la velocidad de fluido en la reducción de la tubería es:

      v = 83,1 m/s

Aprender mas aquí:  brainly.com/question/22645865

You want to determine if three different concentrations (25%, 50%, & 100%) are equally effective at inhibiting the growth of Streptococcus in the antimicrobial assay; which of the following statistical tests would be most appropriate to use? a) Student's paired t-test b) t-test for two independent groups c) Analysis of Variance (ANOVA) d) 2x2 contingency table (Chi-squared test)

Answers

Answer:

thanks thanks thanks thanks for your points

Write 1,000,000w
1,000m
0.001 cm using scientific notation ​

Answers

Answer:

1×10^6 w

1×10^3 m

1×10^(-3) cm

New metals like bohrium our blank or made by people

Answers

I don’t have an answer to that

có một hiệu điện thế đặt vào ba điện trở mắc nối tiếp nhau R1, R2, R3. Nếu R1 < R2 < R3 thì điện trở nào chịu hiệu điện thế lớn nhất ? Điện trở nào chịu hiệu điện thế nhỏ nhất ?

Answers

Answer:

There is a potential difference applied to three resistors connected in series R1, R2, R3. If R1 < R2 < R3, which resistor has the greatest potential difference? Which resistor has the smallest voltage?

Explanation:

An aluminum sphere is 8.20 cm in diameter. What will be its % change in volume if it is heated from 30∘C to 150 ∘C ?

Answers

Answer:

Change in volume / volume = 3 K change in temperature

K = 24E-6 / deg C     coefficient of linear expansion

R = 4.1 cm

dR / R = 24E-6 * 120 dec C = 2.88E-3

V = 4/3 pi R^3

dV = 4 pi R^2 dR

dV / V = 3 dR / R = 2.88E-3 * 3 = 8.6E-3 = .86%

The percentage change in volume of the aluminum sphere at the given cubic expansivity is 0.9%.

Expansion of the aluminum sphere

The percentage change in the volume of the aluminum sphere is determined by applying cubic expansivity formula of the aluminum.

Initial volume of the sphere

V₁ = ⁴/₃πr³

where;

r is the radius = ¹/₂ (8.2 cm) = 4.1 cm = 0.041 m

V₁ = ⁴/₃π(0.041)³

V₁ = 2.887 x 10⁻⁴ m³

[tex]\beta = \frac{\Delta V}{V_1 \Delta T}[/tex]

where;

β is cubic expansion of aluminum = 75 x 10⁻⁶/⁰C

[tex]\Delta V = \beta V_1 \Delta T\\\\\Delta V = (75 \times 10^{-6} )(2.887 \times 10^{-4})(150 - 30)\\\\\Delta V = 2.6 \times 10^{-6} \ m^3[/tex]

Percentage change in volume of the sphere

[tex]\% (V)= \frac{\Delta V}{V_1} \times 100\%\\\\\% (V)= \frac{2.6 \times 10^{-6}}{2.887 \times 10^{-4}} \times 100\%\\\\\% (V)= 0.9 \ \%[/tex]

Learn more about cubic expansivity here: https://brainly.com/question/19630660

a body of mass x is raised to a height of 2m above the ground what it's potential energy if the body is allowed to fall what is it's kinetic energy when half way down​

Answers

Answer:

hey i dont know what it is

Explanation:

Вариант 3.

1. Можно ли считать Землю материальной точкой при определении длины экватора Земли? Ответ поясните

Answers

Answer:

Для ответа на этот вопрос нужно открыть терадочку в том месте, где ты записывала определение материальной точки. На случай, если ты этот момент успешно проспала (что не стало бы сюрпризом), поясню - материальной точкой можно считать тело, размерами которого можно пренебречь. А теперь скажи мне, как можно измерить размер, которым пренебрегаешь?

All ball is thrown up with a vertical velocity of 54 m/s and a horizontal velocity of 39 m/s. Calculate how many seconds it will take for it to reach its peak (assume no air resistance). (Answer to two decimal places).

Answers

5.5 s

Explanation:

The time it takes for the ball to reach its maximum height can be calculated using

[tex]v_y = v_{0y} - gt \Rightarrow t = \dfrac{v_{0y}}{g}[/tex]

since [tex]v_y = 0[/tex] at the top of its trajectory. Plugging in the numbers,

[tex]t = \dfrac{(54\:\text{m/s})}{(9.8\:\text{m/s}^2)} = 5.5\:\text{s}[/tex]

How to Convert N/m2 to N/cm2 ?​

Answers

1 newton / square metre =0.0001 newton / square centimetre

Formula = divide the pressure value by 10000

A hypothesis is

a type of research method that involves experimentation

a statement describing the actual outcome of an experiment

the question that forms the foundation for a particular study

a statement describing what the researchers expect to find in a study

Help plz

Answers

Answer:

A hypothesis is a tentative statement about the relationship between two or more variables. It is a specific, testable prediction about what you expect to happen in a study.

A hypothesis is a tentative statement about the relationship between two or more variables. is a specific, testable prediction about what you expect to happen in a study.

Explanation:

This is answer

Answer:

hey there

hypothesis is a proposed explanation for a phenomenon. For a hypothesis to be a scientific hypothesis, the scientific method requires that one can test it. Scientists generally base scientific hypotheses on previous observations that cannot satisfactorily be explained with the available scientific theories

Explanation:

hope it helps

have a nice day : )

In a race, Usain Bolt accelerates at
1.99 m/s2 for the first 60.0 m, then
decelerates at -0.266 m/s2 for the final
40.0 m. What was his final velocity? (Unit = m/s)

Answers

100 is his final velocity to his speed

how is 1 hectoliter diffrent from 1 kiloliter

Answers

The difference between a kiloliter and hectoliter is kiloliter smaller than a hectoliter

Pls Help FAST
Brainliest

Answers

Answer:

1. S

2.×

3.×

4.×

I hope this can help u

The lantern rises due to a change in the _________
the system

A. Average kinetic energy of

B. Matter around

C. State of matter of

D. Size of particles in

Answers

Answer:

I think it A. Average kinetic energy of

Explanation:

In solids, the molecules are very close together and the attraction between the molecules are great. This causes a substance to have a structure in which the molecules have little freedom to move, as you would see in the case of ice. In the case of a liquid, the molecules are closely spaced, though not as closely spaced as a solid, they have more freedom to move and the intermolecular forces are weaker that that of a solid. Thus a liquid can flow, unlike a solid. Now in a gas, the molecules are sufficiently far apart that there are little to no attractive forces. Because of this a gas can easily be compressed and take the shape of the container.

Now as you heat a solid turning it into a liquid, you increase the kinetic energy of its molecules, moving them further apart until the forces of attraction are reduced to allow it to flow freely. Keep in mind the forces of attraction still exists. Now as you heat a liquid, turning it into a gas, the kinetic energy of the molecules are increased to a point where there are no forces of attraction between the molecules.

The energy required to completely separate the molecules, moving from liquid to gas, is much greater than if you were just to reduce their separation, solid to liquid. Hence the reason why the latent heat of vapourization is greater that the latent heat of fusion.

It’s A. Average kinetic energy of

You skip north for 12 minutes to your best friend's house that is 1.5 kilometers away. What is your average velocity?

Answers

Answer:

velocity 2.0 updated sa showbizz happening

Mass movements occur on slopes because of the pull of gravity.

a. True
b. False

Answers

Answer:

true

Explanation:

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