Hubble's law expresses a relationship between the distance of a galaxy and the speed at which it is moving away from us. This law says that galaxy's velocity is directly proportional to its distance.
This law gives an important insight into the state of the universe. If the universe were static, there would not be a direct relation between velocity and distance. This law is the first observational basis for the expansion of the universe.
Direct relation means that the farther they are moving from the earth, the higher their speed is. This law supports the Big Bang theory of the origin of the universe.
The law can be expressed in equation form
V = \(H_{o\)D
Where,
V = velocity of galaxy
\(H_{o\) = Hubble's constant
D = distance from earth
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Which would have the highest frequency of vibration?
Pendulum A: A 200-g mass attached to a 1.0-m length string
Pendulum B: A 400-g mass attached to a 0.5-m length string
Pendulum B with a 400-g mass attached to a 0.5-m length string would have the highest frequency of vibration.
The frequency of vibration of a pendulum is determined by its length and the acceleration due to gravity. The mass of the pendulum bob does not affect the frequency of vibration.
However, the length of the string does affect the frequency of vibration. A shorter string will have a higher frequency of vibration compared to a longer string. Therefore, Pendulum B with a shorter string length of 0.5 m will have a higher frequency of vibration compared to Pendulum A with a longer string length of 1.0 m.
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Suppose that you measure the linear attenuation coefficent for lead as 1cm-1 for 1 MeV gamma-rays. What are the mass attenuation coefficent and cross section for lead at that energy?
The mass attenuation coefficient and cross-section for lead at 1 MeV are 0.088 cm²/g and 5.30 × 10⁻²² cm², respectively.
The linear attenuation coefficient is related to the mass attenuation coefficient (μ/ρ) by the density (ρ) of the material. Also, the mass attenuation coefficient (μ/ρ) is related to the cross-section (σ) for a particular process.σ = (μ/ρ) × NᴬWhere Nᴬ is Avogadro's number. For lead, the density is 11.35 g/cm³ and Avogadro's number is 6.0221 × 10²³ atoms/mole.
Therefore, the mass attenuation coefficient for lead will be;
μ/ρ = (1 cm⁻¹) ÷ (11.35 g/cm³)= 0.088 cm²/gσ = (0.088 cm²/g) × (6.0221 × 10²³ atoms/mole)= 5.30 × 10⁻²² cm²
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please answer asignment due today
Answer:
Give me some time okkkk
PLEASE HELP IM UNSURE OF WHAT THE ANSWER IS
Answer:
The horizontal forces (Cols 2 & 3) balance for W and Y.
The vertical forces (Cols 1 & 4) also balance for W and Y.
This is not true for either X (unbalanced horizontal forces) or
Z (also unbalnced horizontal forces)
with aid of diagrams state the laws of reflection and refraction.
Light reflects from surfaces in such a way that the angle of incidence equals the angle of reflection. Both angles are measured from the normal line perpendicular to the reflecting surface, as shown in the diagram:
Law of refraction (Snell's Law)Light is refracted when it travels through the frontier between two media. If the medium 1 has an index of refraction n₁ and the medium 2 has an index of refraction n₂, then the angle of incidence θ₁ and the angle of refraction θ₂ satisfy the following equation:
\(n_1\sin\theta_1=n_2\sin\theta_2\)You are given the following consumption function C = 50 + .80YD. What is the amount of autonomous consumption expenditures?
75
100
5
50
The amount of autonomous consumption expenditures is 50. Your answer is: 50.
The amount of autonomous consumption expenditures is 50. This is because autonomous consumption expenditures are the amount of spending that occurs regardless of income. In this consumption function, the constant term of 50 represents the autonomous consumption expenditures.
the amount of autonomous consumption expenditures in the consumption function C = 50 + .80YD, you need to identify the constant term, which is the part of the equation not dependent on YD (disposable income).
In this consumption function, the constant term is 50. Therefore, the amount of autonomous consumption expenditures is 50. Your answer is: 50.
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An airplane starts from rest and undergoes a uniform acceleration of 10.8 m/s^2 for 16.7 s seconds before leaving the ground. What is its displacement?
Answer:
3012.012m
Explanation:
s=it +1/2(10.8)(16.7)^2
How much electricity must flow through a light bulb to do 1 kWh of work? Mains voltage 220 V.
Given:
Energy = 1 kWh
Voltage = 220 Volts
Let's find the amount of electric current that must flow through the light bulb.
To find the amount of electric current, apply the formula:
\(P=IV\)Where:
P is the power in watts = 1 kWh = 1000 Watts
V is the voltage = 200 V
I is the electric current.
Rewrite the formula for I and solve:
\(\begin{gathered} I=\frac{P}{V} \\ \\ I=\frac{1000}{220} \\ \\ I=4.5\text{ A} \end{gathered}\)Therefore, the amount of electric current that must flow through the light bulb is 4.5 Ampere
ANSWER:
4.5 A
A 1.5 kg object is hanging from a spring with a spring constant of 15 N/m on Earth. What is the period of its up-and-down motion?
1.) 0.10 s
2.) 0.31 s
3.) 2.0 s
4.) 2.5 s
Answer: 3) 2.0
Explanation: I guessed and got it right on my assignment :)
What is the velocity of a car that moved 60 km in 3 hours?
60/3
when we divide 60 by 3 we get 20so the answer is 20 km/h
Which statement accurately describes a balanced force?
Answer:
a balanced force is when two forces equal each other out and therefor the object is not in motion.
Explanation:
what fluid property is responsible for the development of the velocity boundary layer? for what kinds of fluids will there be no velocity boundary layer in a pipe?
Fluid viscosity is the property of the fluid that is responsible for the development of the velocity boundary layer. Non-viscous fluids do not exhibit the property of velocity boundary layer in a pipe.
What is fluid viscosity?
Thickness of a fluid is called its viscosity. In liquids, velocity boundary layer is formed due to viscosity.
Viscosity is also termed as the flow rate of a liquid. If a liquid has a high flow rate then its viscosity is low and vice versa.
The fluid viscosity can be measured by using viscometer. The formula to measure viscosity is F = μA. u/y
Here F is force, μ is fluid viscosity, A is the area and u/y sheer deformation rate.
On the contrary, a non-viscous fluid is one that has less thickness and can flow easily.
For example, water is a non-viscous fluid.
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hello random people who use this app
Answer:
Hello stranger I don't know
Explanation:
._____.
Answer:
hi stranger lol
Explanation:
plzzzz urgent
solve this
Answer:
\( \large{ \tt{☄ \: EXPLANATION}} : \)
Before solving , You'll have to know - When an object starts from the state of rest , in this case , initial velocity ( u ) = 0Notice that we're provided the time ( t ) in minutes. So , first thing we have to do is convert the minutes into seconds. It would be - Time ( t ) = 5 minutes = 5 × 60 sec = 300 sec [ 1 min = 60 sec ]Here , We're provided - Initial velocity ( u ) = 0 , Final velocity ( v ) = 60 m / s , Time taken ( t ) = 300 seconds & We're asked to find out the acceleration ( a ) & distance covered by the jeep ( s ) .\( \large{ \tt{♨ \:LET'S \: START}} : \)
Acceleration is defined as the rate of change of velocity. We know :\( \large{ \boxed{ \tt{❁ \: ACCELERATION \: (a) = \frac{FINAL \: VELOCITY(v) - INITIAL \: VELOCITY(u)}{TIME \: TAKEN \: ( \: t \: )}}}} \)
- Plug the values & then simplify !
\( \large{ \bf{↬a = \frac{60 - 0}{300} = \frac{60}{300} = \boxed{ \bold{ \bf{0.2 \: m {s}^{ - 2} }}} }}\)
The acceleration of the jeep is 0.2 m/s²\( \large{ \tt{۵ \: AGAIN, \: USING\: SECOND \: EQUATION \: OF \: MOTION}} : \)
\( \boxed{ \large{ \bf{✾ \: s = \frac{u + v}{2} \times t}}}\)
- Plug the values & then simplify !
\( \large{ \bf{↦s = \frac{0 + 60}{2} \times 300 = \boxed{ \bold{ \bf{9000 \: m}}}}}\)
The distance covered by the jeep is 9000 m .❃ The days that break you are the days that make you ! ♪
♡ Hope I helped! ツ
☃ Have a wonderful day / evening ! ☼
# StayInAndExplore ! ☂
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Answer:
What she said is right I know it is
Which of the following can be a variable? Select all that are correct (Hint: Three are
correct)
a. F
b. X
c. 3
d. a
Kinetic energy is the energy associated with its position or composistion. True or false
FALSE
Kinetic energy is the energy associated with its motionKinetic Energy is energy of an object's motion due to the object's motionA rolling ball, a moving rollercoaster, and a toy car are few example of kinetic energykinetic energy = ½ × m × V²The mass affects the kinetic energy because the more the mass the more energy is given to the objectEnergy is what makes matter move or change. It is also defined as the ability to do work.Motion is a change in position over timeIn Joules describes the amount of energy needed to do a certain amount of work or cause a certain amount of changeTo know more about Kinetic energy visit : https://brainly.com/question/12669551
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an automobile engine provides 559 joules of work to push the pistons and generates 2210 joules of heat that must be carried away by the cooling system. calculate the change in the internal energy of the engine. e
The change in the internal energy of the system (engine) is -2769J.
Internal energy is the inherent form of energy in each system that arises from the molecular state of motion of matter.
The symbol U is used for internal energy The unit of measurement is joules (J).work by the system, w = 559 J
heat removed from the system, q = 2210 J
The change in the internal energy of the system (engine) is calculated by applying first law of thermodynamics;
ΔU = q + w
where;
q is the heat added to the system
w is the work done on the system
ΔU = -(2210 J) + -(559 J)
ΔU = - 2210 - 559
ΔU = -2769 J
Thus, the change in the internal energy of the system (engine) is -2,769 J.
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What is the conversation of energy
Answer:
The conservation of energy is a principle where according to which the energy of interacting bodies or particles in a closed system remains constant.
Explanation:
Answer:
a principle stating that energy cannot be created or destroyed, but can be altered from one form to another.
The fine horizontal scratches etched onto a bullet after it has been fired are called?
The fine horizontal scratches etched onto a bullet after it has been fired are called Striations.
What is Striations?Striations are the minute differences in the curve of the bullet's surface. The bullet and the gun barrel are the harder and softer materials, respectively, in firearms evidence. The striations left on the fired bullet are used as a comparison by firearm examiners.When a gun is discharged, the bullet blasts down the barrel where it strikes ridges and grooves, spinning and improving shot accuracy. These ridges cause striations in the bullet's soft metal by digging into it.An examiner analyses these distinctive markings to verify whether a given bullet was shot from a specific firearm. A barrel will produce individual markings in addition to a bullet's land and groove impressions as the projectile passes through.Learn more about Bullet here:
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why aeroplanes and boat having bird like structure
People have looked up at birds for years and they have inspired us to fly. Airplanes have wings, just like birds. They also have a light skeleton (or framework) to decrease their weight, and they have a streamlined shape to decrease drag.
two small charged particles, 1 and 2, are separated by 0.1mm. if the charge is tripled on both particles, how does the force by particle 1 on particle 2 change?
Integral multiple copies of e are used to quantify charge in any common material. While electrons carry one unit of negatively charged, e, protons carry one unit of positively charged, +e.
It's sometimes referred to as an electron, right?
The word "electron" now refers to
Visit the following to learn more about electrons:
cathode ray particles with negative charges. The minuscule electrons are negatively charged particles with very little mass. The mass of an atom is made up of both protons and neutrons.
We can now use the ideal gas law to calculate each partial pressure:
PHe=nHeRTV=81.54mol×0.08206atm⋅Lmol⋅K×293.15K10.0L=196.2atm
PO2=nO2RTV=1.60mol×0.08206atm⋅Lmol⋅K×293.15K10.0L=3.85atm
The total pressure is formed by adding the two component pressures:
Ptot=PHe+PO2=(196.2+3.85)atm=200.1atm
Any common material's charge is quantified in scale item e. A proton has one positive charge, +e, wh
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Which has more kinetic energy, a 4. 0 kg bowling ball moving at 1. 0 m/s or a 1. 0 kg
bocce ball moving at 4. 0 m/s? Explain your answer
The kinetic energy, a 4. 0 kg bowling ball moving at 1. 0 m/s or a 1. 0 kg bocce ball moving at 4. 0 m/s: The bocce ball has more kinetic energy. Kinetic energy depends on both mass and velocity.
In physics, the kinetic energy of an item is the electricity that it possesses because of its motion. it's far defined because the work had to accelerate a frame of a given mass from rest to its stated pace. Having received this strength for the duration of its acceleration, the frame keeps this kinetic energy unless its speed adjustments.
Kinetic energy is the energy of movement, observable as the motion of an item or subatomic particle. every transferring object and particle have kinetic energy. a person walking, a hovering baseball, a crumb falling from a table and a charged particle in an electric discipline are all examples of kinetic strength at work.
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6. A technlclan can be electrocuted when working on HEVs or EVs.
A) O True
B) O False
Answer:
True
Explanation:
It is true that. A technician can be electrocuted when working on HEVs or EVs, therefore the correct answer is option A
What is an electric vehicle (EV)?An EV stands for an electric vehicle. Electric vehicles (EVs) are autos that are powered totally or partially by electricity. Electric cars are extremely cost-effective to run because they have fewer moving parts to maintain and use little to no fossil fuels (petrol or diesel).
When evaluating its environmental impact, every factor must be taken into consideration. Considering that EVs have a minimal overall environmental impact, this suggests that the severity of these production emissions decreases.
Recycling is one strategy for lowering the lifespan emissions of electric vehicles. Again, incorrect assumptions can be refuted by facts.
Thus, That is accurate. The correct response is option A because a technician could electrocute themselves while working on HEVs or EVs.
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A 1200 kg car initally traveling at 20 m/s increases its speed to 28m/s. how much work did the cars engine have to do to cause this change
Given :
A 1200 kg car initially traveling at 20 m/s increases its speed to 28m/s.
To Find :
How much work did the cars engine have to do to cause this change.
Solution :
We know, work done is given by :
Work Done = Final Kinetic Energy - Initial Kinetic Energy
\(Work \ Done = \dfrac{mv_f^2}{2} - \dfrac{mv_i^2}{2}\\\\Work \ Done = \dfrac{1200 \times 28^2}{2} - \dfrac{1200\times 20^2}{2}\\\\Work \ Done = 230400\ J\\\\Work \ Done = 230.4 \ kJ\)
Therefore, work done by car engine is 230.4 kJ.
3
A car travels at an average speed of 60 km/h for 15 minutes.
How far does the car travel in 15 minutes?
D
900 km
C 240 km
4.0 km
A
В B 15 km
Answer:
(Option B)The car travels 15km in 15 minutes.
Explanation:
Notice that the speed is written using units of km/h and the time is written using units of minutes.
Convert the time interval to hours. Remember that 1 hour equals 60 minutes:
15 min = 15 min × \(\frac{1h}{60~min}=0.25h\)
The distance d that a particle travels during a time t if it moves at an average speed v is given by the formula:
d = v · t
Replace v=60km/h and t=0.25h to find the distance traveled by car:
\(d=(60\frac{km}{h}) ~x~(0.25h)=15km\)
Therefore, the car travels 15km in 15 minutes.
Hope this helps!
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The index of refraction of crown glass is 1.515 for red light and 1.523 for blue light. Find the angle separating rays of the two colors in a piece of crown glass if their angle of incidence is 42o .
Given:
The angle of incidence is,
\(i=42\degree\)The refractive index of the crown glass for red light is,
\(n_r=1.515\)The refractive index of the crown glass for blue light is,
\(n_b=1.523\)To find:
The angle separating rays of the two colours in a piece of crown glass
Explanation:
We know, Snell's law,
\(n_1sini=n_2sinr\)For, the red light,
\(\begin{gathered} 1\times sin42\degree=1.515sinr_r \\ sinr_r=\frac{sin42\degree}{1.515} \\ r_r=sin^{-1}(0.4417) \\ r_r=26.2\degree \end{gathered}\)For, the blue light,
\(\begin{gathered} 1\times sin42\degree=1.523sinr_b \\ r_b=sin^{-1}\frac{sin42\degree}{1.523} \\ r_b=26.1\degree \end{gathered}\)The separation between the refracted rays is,
\(\begin{gathered} r_r-r_b=26.2\degree-26.1\degree \\ =0.1\degree \end{gathered}\)Hence, the required separation is 0.1 degrees.
why is a melting range recorded for a pure sample instead of a melting point? Think about the apparatus and how well heat is transferred.
A melting range is recorded for a pure sample instead of a melting point because the apparatus used to measure the melting process may not transfer heat evenly or quickly enough to accurately determine a precise melting point.
A melting range is a more accurate representation of the temperature range in which the sample transitions from solid to liquid. This is especially important in cases where a sample may have impurities or multiple components with different melting points, which can result in a broader melting range. By recording the melting range, scientists can more accurately identify and characterize the sample.
When a substance is heated, it will typically melt over a range of temperatures rather than at a single temperature, due to factors such as the thermal energy required to overcome intermolecular forces and the sensitivity of the melting process to small variations in pressure and other environmental conditions.
Impurities can further complicate the melting behavior of a substance, by introducing new intermolecular interactions and changing the energy required for the substance to melt. This can cause the melting point of the substance to shift or broaden, making it difficult to accurately determine a single melting point.
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it is dangerous to jump from a significant height why?
Answer:
It is dangerous to jump from a significant height because acceleration due to gravity is produced on a freely falling body.
a ball is thrown straight up from ground level. it passes a 2-m-high window. the bottom of the window is 7.5 m off the ground. the time that elapses from when the ball passes the bottom of the window on the way up, to when it passes the top of the window on the way back down is 1.3 s.
So the initial velocity of the ball was 19.66 m/s.
What happens when ball is thrown straight up from ground?When a ball is thrown straight up from the ground, it follows a parabolic path due to the force of gravity acting on it. The force of gravity causes the ball to accelerate downwards, and as it gains speed, it moves away from the ground.
What happens when the ball reaches its highest point?At the highest point of its trajectory, the vertical velocity of the ball is zero, and from that point on, it begins to slow down and fall back towards the ground. As the ball falls, it gains speed and its velocity becomes negative.
The maximum height of the ball will be v0 = 19.66 m/s
h = 7.5 + 2 = 9.5 m
9.5 = v0 * 1.3 - (1/2) * 9.8 * \((1.3)^{2}\)
v0 = 19.66 m/s
So the initial velocity of the ball was 19.66 m/s.
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Explain the difference between the point of origin and the point of convergence. Which is shown in the image below?
The point of origin is the three dimensional location while the point of convergence is the area containing intersections.
Blood pattern analysisBlood pattern analysis is usually used by the forensic specialists to determine the facts surrounding an investigation using physical nature of blood stains.
There are different types of blood analysis but the one that was displayed in the picture is the impact spatter patterns which contains a point of origin and point of convergence.
The point of origin is the three-dimensional location from which blood spatter originated while the point of convergence is the area containing the intersections generated by lines drawn through the long axes of individual stains that indicates in two dimensions the location of the blood source.
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