Evidence for the Big Bang theory includes the following? Choose to answers.
A. Far away stars show a red shift
B. Microwave background creation is found all over the observational universe
C. In Fraired background radiation is found all over the observable universe
D. Far away stars show a blueshift
Answer:
A. Far away stars show a red shift and B. Microwave background creation is found all over the observational universe
Explanation:
Red shift in color indicates that galaxies are moving away from Earth. This is proof that the Universe is continously expanding, which also supports the big bang theory.
The Big Bang theory predicts that the early universe was a very hot place and that as it expands, the gas within it cools. Thus the universe should be filled with radiation that is literally the remnant heat left over from the Big Bang, called the “cosmic microwave background".
I hope this helps :)
Materials that hold electrons very tightly, and thus don't allow much static electricity to occur around them, are called
Which of the following best describes the relationship between frequency and wavelength of electromagnetic waves?
a
b
If the frequency remains constant, the wavelength increases.
The wavelength decreases as the frequency decreases.
The frequency increases as the wavelength decreases.
If the wavelength remains constant, the frequency increases.
С
d
Answer:
The option that best describes the relationship between frequency and wavelength of electromagnetic waves is the third option
c. The frequency increases as the wavelength decreases
Explanation:
The frequency of an electromagnetic wave, 'f', is given by the following formula;
[tex]Frequency, \, f = \dfrac{Wave \ Speed,v }{Wavelength, \ \lambda}[/tex]
From the above formula, the frequency of an electromagnetic wave is inversely proportional to the wavelength, and therefore, a higher frequency, ('f', to increase), requires a lower wavelength, (λ, decreases)
The correct option is that the frequency of an electromagnetic increases as the wavelength of the wave decrease.
A wave's speed changes when it goes through a different medium, or type of matter. Our atmosphere is one type of medium, and is crucial to helping sunlight sustain life on Earth. Explain how the atmosphere does this, and what life on Earth might be like if we didn't have an atmosphere.
The diver finds a rectangular aluminum plate having dimensions 1.0m x 2.0m x 0.03m. A hoisting cable is lowered from the ship and the diver connects it to the plate. The density of aluminum is 2.7 x 103kg/m3. Ignore the effects of viscosity. (c) Calculate the tension in the cable if it lifts the plate upward at a slow, constant velocity. (d) Will the tension in the hoisting cable increase, decrease, or remain the same if the plate accelerates upward at 0.05 m/s2
Answer:
(c)Tension = 162 N
(d) Increase
Explanation:
(c)
In order for the cable to lift the plate at uniform velocity, the tension in the cable must be equal to the weight of the plate.
[tex]Tension = Weight = (Density)(Volume)\\Tension = (2.7\ x 10^3\ kg/m^3)(1\ m)(2\ m)(0.03\ m)\\[/tex]
Tension = 162 N
(d)
The tension with upward acceleration will become:
[tex]Tension = m(g+a)\\Tension = mg + ma\\Tension = Weight + ma\\[/tex]
Hence, the tension will increase by an amount equal to "ma".
9. Si en una probeta colocamos 25 ml de aceite, 50 ml de agua y 20 g de
mercurio y mezclamos las sustancias. ¿Qué sustancia queda en la
superficie?
¿Cuál en la Interfase?
y ¿Cuál en el fondo de la
probeta?
DEL ESTADO DE
BAJA CALIFORNIA
Answer:
the order of liquids from bottom to top is Mercury - Water - Oil
Explanation:
In general, when several substances are mixed we can have two cases, that the substances dissolve some enter and that the substances have not been miscible (insoluble) this is our case, the three substances do not dissolve.
Therefore they must be deposited according to the principle of Archimedes,
B -W = 0
if the thrust (B) of the liquid is greater than the weight of the upper body, the body floats and if less, the body sinks.
B = ρ_{liquid1} g V_{liquid2}
W = m_{liquid2} g
substance densities are tabulated
ρ_{oil} = 750 to 950 kg / m3
ρ_ water = 1.00 10³ kg / m³
ρ_ Hg = 13.6 10³ kg / m #
The thrust created by the mercury is
B_Hg = ρ_Hg g V_ Liquid2
B_Hg = 13.6 10³ 9.8 V
B _Hg = 133.3 10³ V
The push of the water
B_water = 1 10³ 9.8 V
B_water = 9.8 10³ V
The oil density, let us use ρ_oil = 0.75 10³ kg / m³
B_ oil = 0.750 10³ 9.8 V
B _ oil = 7.35 10³ V
let's find the volumes of the bodies
Mercury
ρ = m / V
V_hg = m /ρ_Hg
V_Hg = 20 10⁻³/ 13.6 10³
V_Hg = 1.47 10⁻⁶ m³
Water
V_water = 50 10⁻³ L
we reduce from liter to m³ 1000 l = 1 m³
V_water = 50 10⁻⁶ m³
Oil
V_oil = 25 10⁻³ l
V_oil = 25 10⁻⁶ m³
Let's look for the push for every two substances
The mercury in the bottom and upper sustabce the water and oil
B_hg = 133.3 10³ (V_water + V_oil)
B = Hg = 133.3 10³ (50 + 25) 10⁻⁶
B = 10 N
the weight of substance on mercury is
W = W_water + W_oil
W = ρ_water g V_water + ρ_oil g V_oil
W = g (ρ_water V_water + ρ_oil V_oil)
W = 9.8 (1 10³ 50 10⁻⁶ + 0.75 10³ 25 10⁻⁶)
W = 9.8 68.75 10⁻³
W = 6.7 10⁻¹ N
We can be that the weight of this substance in less than the push created by the mercury therefore they float.
In resume the mercury is the substance that will be at the bottom of the cylinder.
Let's repeat the calculation for water and oil.
Suppose the water is below
B₂ = ρ_water g V_oil
B₂ = 1 10³ 9.8 25 10⁻⁶
B₂ = 245 10⁻³ N
B₂ = 2.5 10⁻¹ N
The weight of the oil
W = ρ_oil g V_oil
W = 0.750 10³ 9.8 25 10⁻⁶
W = 183.75 10⁻³
W = 1.8 10⁻¹ N
we see that the thrust of the water is greater than the weight of the oil therefore the oil floats in the water
In summary the order of liquids from bottom to top is
Mercury - Water - Oil
Part G Assume that friction causes the car to lose 37,800 joules of energy as it travels from the top of the first hill to the bottom.
What's the car's velocity at the bottom of the first hill? Use your answer from part C (416,500) and the formula v= to determine the answer.
(This formula is the kinetic energy formula, rearranged to find v.) 2KE
Answer:
29.9 m/s
Explanation:
answer on edumentum
Answer:
Because energy is conserved, the kinetic energy at the bottom of the first hill is the potential energy at the top of the hill, minus energy lost from friction:
KE = 416,500 J – 37,800 J = 378,700 J
To find the velocity of the car, plug the values for KE and m into the formula and solve:
The roller coaster car has a velocity of about 29.9 meters/second at the bottom of the first hill.
Explanation:
edmentum
Ill give brainliest! 1. Which item below describes a quick change to
Earth's landscape?
A. a stone becoming smooth
B. dirt moving down a steep hill
C. flat land becoming a canyon
D. a glacier flattening the land below it
Answer:
I believe it's D. a glacier flattening the land below it.
What happens when using an air pump to compress air in a cylinder does work on the air in the cylinder ?
Answer:
work is done on the air in the cylinder
Explanation:
when using air pump to compress air in a cylinder; Work is done on the air in the cylinder and its surroundings
work done = F* d
= Magnitude of force * displacement
This is what happens when an air pump is used to compress air into a cylinder
7 sentences
about degradable
Answer:
Many of planet earth's water pollution crises are due to the use of items that are not degradable biologically;Her address to the United Nations said we have to return to the use of degradable materialsThey are currently producing oxo-degradable materialsSweden is the third nation to perfect and implement the total use of bio-degradable plastic bagsPepsi Cola Company was reported to have promised to discontinue the use of bottles that were not degradable biologicallyAdverse weather conditions eventually make every matter degradable. Some just take longer than otherdetergents are degradable.
Cheers
Calculate the velocity of:
A bus travelling through town, with a mass of 5040 kg and kinetic energy of
493,900 J.
Answer:
solution
given,
mass(m)=5040kg
kinetic energy(ke)=493,900
velocity(v)=?
[tex]ke = \frac{1}{2} mv {}^{2} \\ 493900 = \frac{1}{2} \times 5040 \times v {}^{2} \\ 493900 = \frac{5040v {}^{2} }{2} \\ 493900 = 2520v {}^{2} \\ v {}^{2} = 196 \\ v = \sqrt{196} \\ v = 14ms {}^{ - 1} [/tex]
When an object moves from one point to other point, it possess the energy which is called the Kinetic energy of the object.
The velocity of he bus is 14 m/s.
Given that, a bus travelling through town, with a mass of 5040 kg and kinetic energy of 493,900 J.
So the kinetic energy expressed by the formula given below.
[tex]k=\dfrac {1} {2}mv^2[/tex]
Where, [tex]k[/tex] is the kinetic energy in joules, [tex]m[/tex] is the mass of object in kilograms and [tex]v[/tex] is the velocity of the object in meter per second.
So the velocity of the bus can be calculated by substituting the values in above formula.
[tex]493900=\dfrac{1}{2}\times5040\times v^2[/tex]
[tex]v^2=196\\\\v=\sqrt{196}\\v=14\;\rm m/s[/tex]
The velocity of he bus is 14 m/s.
For more details, follow the link given below.
https://brainly.com/question/999862.
What happens to the magnetic force as an object gets further away from the magnetic field?
Which of the following provides alternating current? Select all that apply.
- Microphone
- Power outlet in your house
- Solar cells
- Battery
PLEASE HELP!! FOR HIGH SCHOOL PHYSICAL SCIENCE! WILL MARK YOU BRAINLIEST!
list some patterns that organize the elements in terms of atomic number, atomic mass and valence electrons? What do the periods (horizontal rows) and groups (vertical columns) of the periodic table indicate to us about the elements that are categorized within them?
Answer:
Periods indicate that a new period at a new principal energy level which is filled with electrons. Groups indicate that the elements share similar properties because their shells are filled with the same number of valence electons.
Explanation:
We see that starting at period 2 Li has a +1 charge , He has +2 charge, B has +3 charge, C has the potential to have a +4 charge or -4 charge (because it can gain or loose electrons) and N has a -3 charge, etc. Groups however, have similar properties and every element in a 1A - 8A has the same number of valence electrons. All except the noble gases in which He only needs 2 electrons to be in a perfect state. This is its octet as it would be a completely different element if it had more than 2 electrons in its shell. An example of the groups sharing similar properties is if we were to look at group 1A. In group 1A we find H, Na, K, etc. These are all highly unstable elements when alone (not in a compound) and they are very reactive. If you were to put Na for instance in water, it would light up and you'd see a flame sitting on top of the water. A scientist could do that with the rest of the elements in the group and they would see this increasing in reactivity as you go down the periods. Francium isn't visible long enough to be able to see this happen though. It's more of that kind of element that scientists prove that it exists, but not a very common element to get to learn much about.
A gold bar 20.0kg at 35.0°c is placed in a large insulated 0.8kg glass container at 15°c and 2.0kg of water at 25°c.. calculate the final equilibrium temperature?
Answer:
The final equilibrium temperature is approximately 26.69 °C
Explanation:
The heat transferred, ΔQ, from a hot body to a cold one is given by the following formula;
ΔQ = m·c·ΔT
Where;
m = The mass of the body
c = The specific heat capacity of the body
ΔT = The temperature change of the body
The given mass of the gold bar, m₁ = 20.0 kg
The initial temperature of the gold bar, T₁ = 35.0 °C
The specific heat capacity of gold, c₁ = 0.13 kJ/(kg·K)
The mass of the glass container, m₂ = 0.8 kg
The initial temperature of the glass container, T₂ = 15°C
The specific heat capacity of glass, c₂ = 0.792 kJ/(kg·K)
The mass of the added water, m₃ = 2.0 kg
The initial temperature of the added water, T₃ = 25°C
The specific heat capacity of water, c₃ = 4.2 kJ/(kg·K)
The heat lost by the gold = The heat gained by the glass and the water
Let 'T' represent the temperature at the final equilibrium, we have;
m₁·c₁·ΔT₁ = m₂·c₂·ΔT₂ + m₃·c₃·ΔT₃
Where;
ΔT₁ = T₁ - T
ΔT₂ = T - T₂
ΔT₃ = T - T₃
∴ 20.0 × 0.13 × (35 - T) = 0.8 × 0.792 × (T - 15) + 2.0 × 4.2 × (T - 25)
Expanding and collecting like terms (using a graphing calculator) gives;
91 - 2.6·T = 9.0336·T - 219.504
9.0336·T + 2.6·T = 219.504 + 91 = 310.504
11.6336·T = 310.504
T = 310.504/11.6336 ≈ 26.69
The final equilibrium temperature, T ≈ 26.69 °C.
Which of the following is a learned behavior of a cat
A. Meowing
B. Drinking water
C. Purring when happy
D. Using a litter box
30POINTS!!!!The solar wind is made up of electrically charged particles. They do not cause harm on Earth. They are too weak.
True
or
False
Answer:
true
Explanation:
the explanation is we would have been roasted if they weren't to weak
the velocity of a car changes from 20 m/s east to 5 m/s east in 5 seconds. What is the acceleration of the car?
Answer:
3 m/s²
Explanation:
Acceleration = Change in velocity/ time
= (20 - 5) / 5
= 3 m/s²
what is the total equivalent resistance of the circuit?
R1= 5Ω, R2= 3Ω, R3= 4Ω, R4= 1Ω, R5= 2Ω
after a hot sun day, a plant withers and dries up. which explains how this happens
Answer:
On a hot, dry day (or after several days with no rain or watering), transpiration causes more water to be lost than is coming in, and the water balance within the plant can get thrown off. The dehydrated collapsing cells in the leaves and stems can no longer remain erect, and the plant begins to wilt.
Explanation:
In the Sun, fusion reactions create helium nuclei. To form each helium nucleus, four hydrogen nuclei fuse. The four hydrogen nuclei have a greater total mass than the newly formed helium nucleus. Which statement explains this difference in mass?
Answer:
the mass deficit is directly proportional to bond reeling
Explanation:
The effect of the mass deficit in the nuclei is
δ = m_nucleons - m_nucleo
the delta quantity is the binding energy of the atomic nucleus,
This mass is related to energy by the Einstein relation
ΔE = c² Δm
therefore the mass deficit is directly proportional to bond reeling
Answer:
C. Some of the mass of the four hydrogen nuclei was converted into
energy
Explanation:
Ap3x
PLZZZ HELP ME ASAP!!! :(
Ball A has a mass of 50 kg. Ball B has a mass of 75 kg. Both move at the same velocity. Which has a greater momentum?
Answer:
Ball B
Explanation:
I say this because its the heavier one?
The momentum of a body increases with increase in mass. Hence, among the two balls, the ball with the greater mass that is ball B has the greater momentum.
What is momentum ?Momentum is the ability of a moving object to bring the force effective to make maximum displacement. It is the product of mass and velocity.
P = mv
Thus, as the velocity and mass increases, the momentum increases. The force applied on a body with greater mass makes greater acceleration and greater momentum.
Therefore, at constant velocity, the object with the greater mass will have the greater momentum. Then, the ball with 75 kg mass is having the greater momentum.
Find more on momentum:
https://brainly.com/question/24030570
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solid state has ____________ intermolecular force of attraction.
solid state has the most intermolecular force of attraction.
What are the first three harmonics of a note produced on a 0.31 m long violin string if the waves on this string have a speed of 274.4 M/s
Answer:
442 Hz, 882 Hz, 1330 Hz
Explanation:
Given data: length of the string= 0.31 m = 31 cm
speed of the waves = 274.4 M/s or 2740 cm/s
Wavelengths are
62 cm
31 cm and
62 / 3 = 20.67 cm
The frequencies associated with these wavelengths ( which are the 1st, 2nd and 3rd harmonics )
are
27440/ 62 = 442.6 = 442 Hz
27440/31 = 885.2 = 882 Hz
27440 / 20.67 = 1328 = 1330 Hz
Some beetles break down the remains of dead animals. Some mushrooms breakdown the remains of dead trees. How do these actions most benefit plants? *
Answer:
A By returning nutrients to the soil
Explanation:
Here are the options
A By returning nutrients to the soil
B By releasing oxygen into the air
C By making space for new animals
D By decreasing the population of herbivores
The process by which mushrooms act on dead trees provide nutrients that are necessary for the process of photosynthesis.
Types of decomposers
Fungi - mushroom is an example of a fungiBacteria Insects - beetle is an example of an insectEarthwormsFunctions of a decomposer
A decomposer recycles dead plants and animals to release nutrients into the soil.They are ecological cleaners. they carry out this function by disintegrating dead plants and animal remains.True or False?
waves transfer the material from one location to another
Answer: False
Explanation:
If you mix hot water and cold water in an isolated medium, what would be the temperature of the mixture after a certain duration?
The mixture would have the temperature equal to the temperature of the hot water.
The mixture would have the temperature equal to the temperature of the cold water.
The temperature of the mixture would become zero.
The mixture would have the temperature between the initial temperatures of the hot water and the cold water.
Answer: D.
Explanation:
I just took a quiz im in highschool too and I got a 100
If you mix hot water and cold water in an isolated medium the mixture would have the temperature intermediate of the initial temperatures of the hot water and the cold water because of heat transfer.
How heat is transferred ?
Heat moves from higher temperature to lower temperature, a mixture of hot and cold water reaches an intermediate temperature. When hot water is placed over cold water, the denser cold water flows to the bottom, mixes with the hot water, and heats up.Energy is transferred from the hotter, or higher temperature, object to the colder, or lower temperature, object when two objects with different temperatures come into contact, until both are the same temperature. Once the temperatures are the same, there is no net heat transfer because the heat that is transferred from one object to another is the same as the heat that is returned.Changes in temperature are one of the main effects of heat transfer. The temperature rises when heated, while it falls when cooled. The change in a substance's temperature, the substance's mass, and certain phase-related physical properties are the three factors that, according to experiments, determine how much heat is transferred to or from a substance.Heat transfer takes place whenever there is a difference in temperature. Heat move might happen quickly, for example, through a cooking container, or gradually, like through the walls of a protected cooler.There are three distinct approaches to heat transfer: radiation, conduction, and convection. All three may occasionally occur simultaneously.To know more about heat transfer check this:
brainly.com/question/20083116
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En un tiempo de 60 s (segundos), una masa de 0,0014 kg, cambia su velocidad de 25 m/s a 60 m/s. Determine qué fuerza actúa sobre el mismo.
Answer:
Fuerza = 0.0082 Newton
Explanation:
Dados los siguientes datos;
Velocidad inicial, u = 25 m/s
Velocidad final, v = 60 m/s
Tiempo, t = 60 segundos
Masa = 0,0014 kg
Para encontrar la fuerza que actúa sobre el objeto;
En primer lugar, determinaríamos la aceleración del objeto.
Aceleración = (v - u)/t
Aceleración = (60 - 25)/60
Aceleración = 35/60
Aceleración = 5.83 m/s²
A continuación, encontramos la fuerza;
Fuerza = masa * aceleración
Fuerza = 0.0014 * 5.83
Fuerza = 0.0082 Newton
Question :
⇒Define Force
In physics, a force is any interaction that, when unopposed, will change the motion of an object.
[tex] \\ [/tex]