A toy car is released from rest at the top of a ramp. The car
speeds up as it moves down the ramp. When it reaches the
bottom of the ramp, the toy car rolls across the floor and
eventually stops.
Which two statements identify evidence that energy was conserved?
A. As the car rolls down the ramp, it speeds up because gravitational
potential energy is transformed into kinetic energy.
B. As the car rolls down the ramp, it speeds up because thermal
energy due to friction is transformed into kinetic energy.
m C. As the car rolls across the floor, it stops because its kinetic
energy is transformed into gravitational potential energy,
1 D. As the car rolls across the floor, it stops because its kinetic energy
is transformed into thermal energy due to friction

Answer:

D. and A

Explanation:

logical thought is base on functional fixedness; mental sets while creative problem solving uses insight; algorithms.

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]

6

Explanation:

yhhhunkmombfdcgjjyvunkkbdsfgbjjj

La distancia que el bote se desplaza rio abajo es 44.5 metros.

Debemos recordar que la velocidad en cada eje es independiente de la velocidad en el otro eje. Tambien recordar que:

distancia = velocidad*tiempo.

Esto quiere decir que si el bote se mueve a 8m/s de un extremo al otro del rio, esta velocidad en esta dirección se va a mantener.

Entonces el tiempo que tarda en viajar 89 metros (el ancho del rio) a una velocidad de 8m/s es:

T = (89 m)/(8m/s) = 11.125 segundos.

Ahora notamos que durante esos 11.125 segundos el bote tambien se mueve siguiendo el flujo del rio, a una velocidad de 4.0 m/s, entonces la distancia que el bote se desplaza rio abajo es:

D = 11.125s*4.0m/s = 44.5 metros

Sí quieres aprender mas sobre velocidad, puedes leer:

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Answer:

the paper

Explanation:

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

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Answer:

yes zero colder enough

Explanation:

for temperature ^_^^_^

Answer:

hpqfie

Explanation:

wdq i love math WOOOOO

Answer:

1. S

2.×

3.×

4.×

I hope this can help u

Answer:

205 kilograms.

answer ok :)

Answer:

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

Explanation:

[tex]\bull\sf Torque=\tau=20.0\times 10^{-9}Nm[/tex]

[tex]\bull\sf \theta=30°[/tex]

[tex]\bull\sf E=9.0\times C.m=9.0\times 10^{-12}N/C[/tex]

Now we know

[tex]\\ \sf\longmapsto \tau=pEsin\theta[/tex]

[tex]\\ \sf\longmapsto p=\dfrac{\tau}{Esin\theta}[/tex]

[tex]\\ \sf\longmapsto p=\dfrac{20\times 10^{-9}}{9\times 10^{-12}\times sin30}[/tex]

[tex]\\ \sf\longmapsto p=\dfrac{20\times 10^{-9}}{9\times 10^{-12}\times \dfrac{1}{2}}[/tex]

[tex]\\ \sf\longmapsto p=\dfrac{20\times 10^{-9}}{9\times 10^{-12}}\times 2[/tex]

[tex]\\ \sf\longmapsto p=4.4\times 10^3N/C[/tex]

The magnitude of the externla electric field is 4,444.44 N/C.

The magnitude of the charge is 3.1 x 10⁻¹² C.

The magnitude of the externla electric field is calculated as follows;

EPsinθ = τ

where;

[tex]E = \frac{\tau}{P sin(\theta)} \\\\E = \frac{20 \times 10^{-9}}{9\times 10^{-12} \times sin(30)} \\\\E = 4,444.44 \ N/C[/tex]

The magnitude of the charge is calculated as follows;

[tex]E = \frac{kQ}{r^2} \\\\Q = \frac{Er^2}{k} \\\\Q = \frac{(4,444.44) \times (2.5 \times 10^{-3})^2}{(9\times 10^9)} \\\\Q = 3.1 \times 10^{-12} \ C[/tex]

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Answer:

D.

Explanation:

A

because energy is also a product

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?

Answer:

Steps and solution in the attached pictureSteps and solution in the attached picture.

Explanation:

Steps and solution in the attached pictureSteps and solution in the attached picture.

The velocity of the second ball just after it is struck will be 9.091 m/s.

To quantify the effect of force acting over time to change the momentum of an object is referred to as impulse.

To calculate the velocity in the given scenario,

Given that,

mV=1.5

[tex]V=\frac{impulse}{mass}[/tex]

[tex]V=\frac{1.5}{0.165}[/tex]

V=9.091 m/s

Thus, the velocity will be 9.091 m/s.

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#SPJ2

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:

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.

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°

Answer:

hey i dont know what it is

Explanation:

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%.

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

V₁ = ⁴/₃πr³

where;

V₁ = ⁴/₃π(0.041)³

V₁ = 2.887 x 10⁻⁴ m³

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

where;

[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]

[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]

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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.

Answer:

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 : )

Answer:

Radiation is the transfer of energy through waves (electromagnetic radiation) or fast traveling particles (particulate radiation). Radiation can be in the form of heat, sound and light. Radiation can be felt or seen like light or detected through special instruments like X-ray. Radiation from a hot object is shorter..

Explanation:

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,

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Answer:

f = 25 lbs

m = 5 lbs

a =?

f = ma

25 = 5 a( divide both sides by 5)

a = 5(lbs)

Answer:

true

Explanation:

Answer:

velocity 2.0 updated sa showbizz happening

Answer:

1×10^6 w

1×10^3 m

1×10^(-3) cm