Answer:
By observing the time between transits, we know the orbital period. Kepler's Third law can be used to determine the orbital radius of the planet if the mass of the orbiting star is known (R3=T2−Mstar/Msun, the radius is in AU and the period is in earth years).
Explanation:
hope this helps!
The electron affinity of thulium has been measured by a technique known as laser photodetachment electron spectroscopy. In this technique, a gaseous beam of the anions of an element is bombarded with photons from a laser. Electrons from the anion are then ejected and their energies are detected. The incident radiation had a wavelength of 1064 nm, and the ejected electrons were found to have an energy of 0.137 eV. The electron affinity is the difference in energy between the incident photons and the energy of the ejected electrons. Determine the electron affinity of thulium in units of electron volts per atom.
Answer:
ΔE = 1.031 eV
Explanation:
For this exercise let's calculate the energy of the photons using Planck's equation
E = h f
wavelength and frequency are related
c = λ f
f = c /λ
let's substitute
E = h c /λ
let's calculate
E = 6.63 10⁻³⁴ 3 10⁸/1064 10⁻⁹
E = 1.869 10⁻¹⁹ J
let's reduce to eV
E = 1.869 10⁻¹⁹ J (1 eV / 1.6 10⁻¹⁹ J)
E = 1.168 eV
therefore the electron affinity is
ΔE = E - 0.137
ΔE = 1.168 - 0.137
ΔE = 1.031 eV
The electron affinity of thulium in units of electron volts per atom is; ΔE ≈ 1.031 eV
From Planck's equation, we can find the energy of the photons when given wavelength as;
E = hc/λ
Where;
h is Planck's constant = 6.626 × 10⁻³⁴ J.s
c is speed of light = 3 × 10⁸ m/s
λ is wavelength
We are given;
wavelength; λ = 1064 nm = 1064 × 10⁻⁹ m
Thus;
E = (6.626 × 10⁻³⁴ × 3 × 10⁸)/(1064 × 10⁻⁹)
E2 = 1.868 × 10⁻¹⁹ J
Converting to eV gives;
E2 = (1.868 × 10⁻¹⁹)/(1.6 × 10⁻¹⁹)
E2 = 1.1675 eV
We are given E1 = 0.137 eV.
Now, electron affinity is simply change in energy. Thus;
ΔE = 1.1675 - 0.137
ΔE ≈ 1.031 eV
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Forces may cause an object to change ____ if it is unable to move
Answer:
Motion
Acceleration is the change of velocity per unit time, so if there is no force, all we know is that the acceleration is zero. Therefore, the velocity is not changing. If the object was already moving, then it will just keep moving. So, the object can be moving even when there is no force applied to it.
Forces may cause an object to change its state if it is unable to move. The force make the object to move from its state of rest.
What is force?Force is an external agent acting on an object to deform it or to change it state of rest or motion. There are various kinds of forces such as gravitational force, nuclear force, magnetic force, frictional force etc.
Force is a vector quantity thus, it is characterised by its magnitude and direction. According to Newton's first law of motion, an object will continue in its state or motion or rest until an external force acts on it.
Therefore, force changes the state of an object. Force is dependant on the mass of the object. Greater the mass, greater will be the force required to move the object from stationary to stop it from motion.
According to second law of motion, force is the product of mass and acceleration of the object. Hence, force accelerates the body and a change in force changes the acceleration of the object.
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12. A screwdriver is which type of a simple machine?
O wedge
O screw
O wheel and axle
O lever
Answer:
wheel and axle
Explanation:
hope this helps
how many apples are in 29 trees if each tree has 45 apples?
Answer:
1305 I think but not sure
How long would it take to swim across a lake that is 350 meters, if you swam at 9 m/sec
Answer:
[tex]\boxed {\tt t\approx 38.89 \ s}[/tex]
Explanation:
Time can be found by dividing the distance by the speed.
[tex]t=\frac{d}{s}[/tex]
The distance is 350 meters.
The speed is 9 meters per second.
[tex]d= 350 \ m \\s= 9 \ m/s[/tex]
Substitute the values into the formula.
[tex]t=\frac{350 \ m}{9 \ m/s}[/tex]
Divide. Note that the meters or "m" will cancel each other out and the seconds or "s" will move to the numerator.
[tex]t=\frac{350 }{9 \ s}[/tex]
[tex]t=\frac{350 \ s}{9}[/tex]
[tex]t=38.8888889 \ s[/tex]
Round to the nearest hundredth. The 8 in the thousandth place tells us to round the 8 to a 9.
[tex]t \approx38.89 \ s[/tex]
It will take about 38.89 seconds to swim 350 meters at 9 meters per second.
Please help A.S.A.P
What would you expect to see on intrusive igneous rocks compared to extrusive igneous rocks?
Answer:
Intrusive igneous rocks cool from magma slowly because they are buried beneath the surface, so they have large crystals. Extrusive igneous rocks cool from lava rapidly because they form at the surface, so they have small crystals. Texture reflects how an igneous rock formed
Explanation:
how do you find circular motion?
Answer:
Explanation:
By multiplying the rotational frequency with the circumference we can determine the average speed of the object. The circular velocity formula is expressed as, vc = 2 πr / T. Where in, r denotes the radius of the circular orbit. T is time period.
Answer:
2πr
as we know that the circumference of a circle is 2 * π * r, the arc length of the whole circle is 2πr units. Then using the formula s = r * theta, the angle theta equals the arc length divided by the radius. Therefore theta = 2πr/r = 2π radians.
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If a ball has a mass of 224 grams and a volume of 53ml, what is the density of the ball? Please round your answer to the nearest tenth.
Answer:
The answer is 4.2 g/mLExplanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\ [/tex]
We have
[tex]density = \frac{224}{53} \\ = 4.2264150943396...[/tex]
We have the final answer as
4.2 g/mL to the nearest tenthHope this helps you
Answer:
The density is 4.2
Explanation:
D=M/V
Density is equal to mass/Volume thus D=M/V
How can you explain why there are so many hours of darkness on December 21? How can you explain why there are so many hours of daylight on June 21?
Answer:
At the december solstice,the northern hemisphere is leaning most away from the sun for the year.At the december solatric,earth is positioned in its orbit so that the sun below the north pole horizon. After the winter solstice,the days get longer,and the night shorter.
what do you notice from the picture?
What one would notice from the picture depend on the view point and the perspective of the person because different people looking at this elephant would notice a different thing according to their perception.
What is perspective?Perspective refers to how one views things. It is a method of art that modifies the size or depth of an item on paper. Farm owners' perspectives on a shortage of rain are an illustration of perception. In a picture, the train tracks appear to curve into the horizon as an illustration of perspectives.
For the person looking from the front elephant's teeth would appear like a spear, for the person looking at its leg would imagine a tree , for the person on the ladder the big structure of the elephant would appear like a wall,the person looking from the back on its tail would imagine it as a rope.
Thus, perspective is very crucial when we are looking at different things from different angles.
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One particle has a charge of 4.2 x 10-9 C, while another particle has a charge
of 1.10 x 10-9 C. If the two particles are separated by 0.005 m, what is the
electromagnetic force between them? The equation for Coulomb's law is
Fe = k992, and the constant, k, equals 9.00 x 109 Nm2/C2.
A. 8.31 x 10-6N
B. 1.66 x 10-5 N
C. 1.85 10-13 N
D. 1.66 10-3 N
Answer:
D
Explanation:
Answer:
The forces between the charges is [tex]1.66*10^{-3} N[/tex]
Explanation:
Data given:
First charge [tex]q_{1} =4.2*10^{-9} C[/tex]
Another charge [tex]q_{2} =1.1*10^{-9} C[/tex]
Distance (r)= (0.005)m
Force(F)=?
It is based on Electrostatic force between two charges i.e. defined by Coulomb's law.
What is electrostatic force?The force acting between two static charges, is called electrostatic force.
What is Coulomb's law?The force acting between two charges is
(a) directly proportional to the product of charges F ∝ [tex]q_{1} q_{2}[/tex]
(b) inversely proportional to the square of the separation. F ∝ [tex]\frac{1}{r^{2} }[/tex]
From above;
[tex]F=k.\frac{q_{1} q_{2} }{r^{2} }[/tex]
On putting values: -
[tex]F=1.66*10^{-3} N[/tex]
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A branch swept into a Category 3 hurricane has a centripetal acceleration of 0.028 m/s2. Estimate the radius of the storm is wind speeds are
53 m/s
Answer:
Radius, r = 100321.43m or 10.03 * 10^4m
Explanation:
Given the following data;
Acceleration, a = 0.028m/s²
Speed = 53m/s
Centripetal acceleration is given by the formula;
[tex] Acceleration, a = \frac {v^{2}}{r}[/tex]
Substituting into the equation, we have;
[tex] Acceleration, a = \frac {53^{2}}{0.028}[/tex]
[tex] Acceleration, a = \frac {2809}{0.028}[/tex]
Radius, r = 100321.43m or 10.03 * 10^4m
How much force is required to accelerate a 0.145 kg baseball to 150 m/s2?
1 point
An Arizona solar power plant is able to produce 24 megawatts, which
serves 6,000 homes. How many watts per home?
40 W
О
400 W
4,000 W
40,000 W
I don’t know why I am feeling worse day by day!
Answer:
Why ?? What happened ??
Please help!! Thank you<3 This isn't Physics its Sciene please help me :(
Answer:
The strong - arm team would win because they can excert more thrust on the rope.Explanation:
In this case, gravity is pulling down on them ( both teams ), the strong - arm team is excerting thrust by trying to pull the rope, and you've got the drag of the other team pulling back.
how permeable and porous would an aquifer be?
Answer: An aquifer is a body of saturated rock through which water can easily move. Aquifers must be both permeable and porous and include such rock types as a sandstone.
Explanation: However, if these rocks are highly fractured, they make good aquifers.
The picture is my question
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Define measurement.
Answer:
The process of comparison of unknown quantity with the help of known standard quantity is known as measurement...Hope this helps:)
Answer:
the comparison of an unknown quantity with the known quantity.
Explanation:
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What special name is given to group II elements in the periodic table?
Answer:
Alkaline earth metals.
Explanation:
For e.g The metals of group ll are: Be, Mg, Ca, etc
Acceleration is the rate of change in the speed of an object. To determine the rate of acceleration, you use the formula below. The units for acceleration are meters per second per second or m/s2.
Explanation:
Acceleration is the rate of change in the speed of an object. If initial and final speed are v₁ and v₂. It changes speed in time t. Its formula is given by :
[tex]a=\dfrac{v_2-v_1}{t}[/tex]
The problem is "A skater increases her velocity from 2.0 m/s to 10.0 m/s in 3.0 seconds. What is the skater’s acceleration? "
In this problem,
v₁ = 2 , v₂ = 10 m/s and t = 3 s
Acceleration of the object,
[tex]a=\dfrac{10-2}{3}\\\\a=2.67\ m/s^2[/tex]
So, the acceleration of the skater is [tex]2.67\ m/s^2[/tex].
To decorate for a party, Simon needs 1,850 centimeters of colorful streamers. If the ratio of meters to centimeters is 1 : 100, how many meters of streamers does he require?
A.
18,500 meters
B.
185 meters
C.
18.5 meters
D.
1.85 meters
An elephant of mass 100kg stands with all four foots on the ground.Each foot covers an area of 0.04m2.calculate the pressure exerted on the ground.
Answer:
140KG
Explanation:
What is his average acceleration from 10 to 20 seconds
Answer:-2.0
Explanation:khan academy
A cheetah can run at a maximum speed 103 km/h and a gazelle can run at a maximum speed of 76.5 km/h. If both animals are running at full speed, with the gazelle 99.3 m ahead, how long before the cheetah catches its prey?
Answer in units of s.
Part 2: The cheetah can maintain its maximum speed for only 7.5 s. What is the minimum distance the gazelle must be ahead of the cheetah to have a chance of escape? (After 7.5 s the speed of cheetah is less than that of the gazelle.)
Answer in units of m.
Answer:
1
[tex] t_a = 13.49 \ s [/tex]
2
The distance is [tex] D = 55.2 \ m [/tex]
Explanation:
From the question we are told that
The maximum speed of the cheetah is [tex]v = 103 \ km/h = 28.61 \ m/s[/tex]
The maximum of gazelle is [tex]u = 76.5 \ km/h = 21.25 \ m/s[/tex]
The distance ahead is [tex]d = 99.3 \ m[/tex]
Let [tex]t_a[/tex] denote the time which the cheetah catches the gazelle
Gnerally the equation representing the distance the cheetah needs to move in order to catch the gazelle is
[tex] v* t_a = d + u* t_a [/tex]
=> [tex] 28.61 t_a = 99.3 + 21.25t_a [/tex]
=> [tex] 7.36 t_a = 99.3 [/tex]
=> [tex] t_a = 13.49 \ s [/tex]
Now at t = 7.5 s
[tex]7.5 v = D+ 7.5u [/tex]
=> [tex] 28.61 * 7.5 = D + 21.25* 7.5 [/tex]
=> [tex] 7.36 * 7.5 =D [/tex]
=> [tex] D = 55.2 \ m [/tex]
Hence the for the gazelle to escape the cheetah it must be 55.2 m
If the Mass Number is the sum of the protons and neutrons in an atom, what is
the mass number of
Answer:
It's 31
Explanation:
add 15 and 16
A lever has a total length of 12 meters with a fulcrum at the exact center of the lever. Which best describes how to
double the mechanical
advantage of the lever?
O Move the fulcrum 2 meters away from the side on which the force is applied.
Move the fulcrum 2 meters toward the side on which the force is applied.
O Move the fulcrum 4 meters away from the side on which the force is applied.
O Move the fulcrum 4 meters toward the side on which the force is applied.
Answer:
The correct option is the last option.
Explanation:
Generally, when trying to create a mechanical advantage of a lever for an apparatus or a machine, the load is usually moved closer to the fulcrum. Hence, if a lever has a total length of 12 meters and the fulcrum is placed at 6 meters (the center), the best way (based on the previous statement) to double the mechanical advantage of the lever is to move the fulcrum 4 meters toward the side on which the force is applied. The correct option is the last option.
Answer: the answer is not d idk wat it is sorry but its not d
Which quantities define momentum?
A. How much matter an object has, plus the magnitude and direction
of its motion
B. How much weight an object has, plus the magnitude of its
acceleration
C. How much force is pushing an object, plus its speed
D. How fast an object is traveling, plus its weight
Answer:
A. How much matter an object has, plus the magnitude and direction of its motion
Explanation:
Momentum is defined as the product of mass by velocity, in the international system of measurements (SI) momentum has the following Units [kg*m/s].
P = m*v
where:
P = momentum Lineal [kg*m/s]
m = mass [kg]
v = velocity [m/s]
Therefore the answer is A) How much matter an object has, plus the magnitude and direction of its motion
Answer:
A is correct
Explanation:
A P E X
Write a statement that explains the relationship among velocity, speed, and direction.
Answer:
velocity is the speed and direction of a moving object
Explanation:
that is basicaly the defention
what is the name of the phobias of space?
Answer:
Astrophobia
Explanation:
heop it help