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Inessa [10]
4 years ago
12

A scientific law states that planets move in elliptical orbits around stars. Which of these statements is correct about this law

?
It is not strengthened by data and observations.

It provides explanations for observations which can change.

It is a well supported description which cannot become a theory.

It can change from time to time due to new scientific evidence.
Physics
2 answers:
Natali5045456 [20]4 years ago
6 0
<span>A scientific law states that planets move in elliptical orbits around stars. The statement which is correct about this law is that it</span><span> provides explanations for observations which can change.
A law explains why something happens - that can change and so will the theory in time.
</span>
Art [367]4 years ago
4 0

Answer:

It provides explanations for observations which can change.

Explanation:

Scientific laws are theories that have been tested, proven, and adopted as laws. Scientists experiment to test a theory wherein Data is collected, analyzed. After multiple testing, the result is concluded and if the theory is proven, it is adopted as law.

According to Kepler's law, planets move around stars in elliptical orbits. It was a theory earlier but after testing it and proving it, it was accepted as a law. It will provide the explanation for any observations related to the motion of the planets.

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Explain how neurons convey information using both electrical and chemical signals.
8090 [49]

Answer:

Explanation:

Neurons communicate via both electrical signals and chemical signals. The electrical signals are action potentials, which transmit the information from one of a neuron to the other; the chemical signals are neurotransmitters, which transmit the information from one neuron to the next.

The electrical signal travels down the axon to the axon terminals where it tells the vesicles to release the neurotransmitters into the synaptic cleft which travel to the receptors of the receiving cell which releases the second messengers

6 0
3 years ago
Two concentric circular loops of radii b and 2b, made of the same type of wire, lie in the plane of the page, as shown below. Th
sweet-ann [11.9K]

Answer:

a. R2b = R/4

Explanation:

The total resistance of a metallic wire is given by the following formula:

R = ρL/A

where,

R = Resistance of Wire

ρ = Resistivity of the material of wire

L = Length of Wire

A = Area of Wire = πr²

Therefore,

R = ρL/πr²

for the 1st wire,

radius = r = b

Therefore,

R = ρL/πb²   ----------- equation 1

Now, for the second wire,

r = 2b

Therefore,

R2b = ρL/π(2b)²

R2b = ρL/πb²4

using equation 1:

R2b = R/4

therefore, correct option is:

<u>a. R2b = R/4</u>

8 0
3 years ago
Which describes why the sun is a renewable resource? The sun creates biomass. The sun is continuously releasing energy. The sun
Fynjy0 [20]

Renewable source means that it can never run out or run out in a long time. In this case the sun is expected to shine for about five billion years because of the high amount of hydrogen that is stored in its core. So the answer should be "The sun is continuously releasing energy". This answer is the best because there are many other renewable resources on earth that can cause pollution.

6 0
3 years ago
Si un movil parte del reposo logrando una aceleracion de 5 metros por segundo al cuadrado durante 8 segundos calcular la velocid
Komok [63]

Answer:

Velocidad final, V = 40 m/s

Explanation:

Dados los siguientes datos;

Aceleración = 5 m/s²

Velocidad inicial = 0 m/s (ya que comienza desde el reposo)

Tiempo = 8 segundos

Para encontrar la velocidad final, usaríamos la primera ecuación de movimiento;

V = U + at

Dónde;

  • V es la velocidad final.
  • U es la velocidad inicial.
  • a es la aceleración.
  • t es el tiempo medido en segundos.

Sustituyendo en la fórmula, tenemos;

V = 0 + 5*8

V = 0 + 40

V = 40

<em>Velocidad final, V = 40 m/s</em>

6 0
3 years ago
An airplane has an effective wing surface area of 19.4 m2 that is generating the lift force. In level flight the air speed over
alexgriva [62]

Answer:

W =23807.68 N

Explanation:

given,

surface area of wing = 19.4 m²

speed over top wing = 67 m/s

speed under wing = 51 m/s

density of air =  1.3 kg/m³

weight of plane

From Bernoulli's principle

P_1 + \dfrac{1}{2}\rho v_1^2 = P_2 + \dfrac{1}{2}\rho_2^2

where 1 and 2 are two different locations at the same geo potential level  

so if we call 1 the lower surface and 2 the upper surface,

we find the pressure differential, P₁ -P₂

\Delta P =\dfrac{1}{2}\rho (v_2^2-v_1^2)

\Delta P =\dfrac{1}{2}\times 1.3 \times (67^2-51^2)

\Delta P =1227.2\ N/m^2

then the force acting on the plane is

F=P A

F=1227.2 x 19.4

F =23807.68 N

weight of the plane

W =23807.68 N

7 0
3 years ago
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