What is the de-Broglie wavelength of a 70kg person jogging at the rate of 2.70m/s. the mass of an electron is 9.11 x 10-28g, the speed of light is 3.00 x 108m/s, planks constant is 6.63 x 10-34js.
The de-Broglie wavelength of a person jogging at the rate of 2.70m/s is 3.5 x 10⁻³² m.
What is de-Broglie wavelength?De-Broglie wavelength is the ratio of Planck's constant h to the momentum of the electron p.
Momentum p = mass m x velocity v
Given is the mass of a person = 70kg, the speed of person 2.70m/s, Planck's constant h= 6.63 x 10⁻³⁴J.s
De- Broglie wavelength λ= h/mv
λ = 6.63 x 10⁻³⁴/ ( 70 x 2.70)
λ = 3.5 x 10⁻³² m
Thus the wavelength is 3.5 x 10⁻³² m.
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What is one way that trees can be like fossil fuels? A. They do not produce carbon dioxide when burned. B. They both grow. C. We can use our supply fa … ster than they can be replenished. D. They can not be replenished at all.
Answer:
Answer C. But don't be surprised if it isn't.
Explanation:
You can't use D. Trees can be replenished. Maybe not as well as God planted them in the first place, but we can replenish them.
A is incorrect. when burned, trees will produce CO2. In fact, trees produce more CO2 when burned that do fossil fuels do
Fossil fuels don't grow. Their rate of discovery might, but they themselves don't grow. Not B
C is your only choice. The problem is that it is not entirely true. We can replenish trees. Whether enough trees can be used as a clean fuel and be replaced in amounts we are used is the question.
How long will it take for a spacecraft traveling at
15,000 Kilometers per hour to cover the distance from the
Earth to the Moon, which is about 250,000 Kilometers?
Answer:
16 2/3 hr
Explanation:
250 000 km / 15 000 km/hr = 16 2/3 hours
a flashlight bulb with a 6.00 resistor uses 18.0W of power. What is the current through the bulb
a. I= 2.00A
b. I=3.00A
c. I=1.73A
d. I =0.333A
We need voltage first
P=V²/RV²=PRV²=18(6)V²=108V=√108V=10.4VApply oHMS law
V/I=RI=V/RI=10.4/6I=1.73AAnswer:
c. I = 1.73A
Explanation:
The formula for power :
P = VIThe formula for potential difference :
V = IRCalculating P by inputting the formula of V :
P = (IR)(I)P = I²RSolving using the given values :
18 = I² x 6I² = 3I = √3I = 1.73AHow many hydrogen atoms can bond with this oxygen atom?
Answer:
2
Explanation:
there are two lonely pairs
2 hydrogens
Explanation:
oxygen has 3 lone pairs of electrons which do not take part in the bonding leaving two electrons in the outermost shell to be part of it, hydrogen has only one electron in it's outermost shell it needs one electron to be stable so two atoms of hydrogen bonds with one oxygen atom to to share there electrons to be stable.
How are u? I hope u doing well ااااااااااااااااا
Answer:
Hey
I'm alright and you
I also hope you're doing well
Define the concept of heat. What is heat?
Answer:
In a simplest terms,
temperature is how hot or cold an object is, while heat is the energy that flows from a hotter object to cooler one
what is the relationship between Earth’s revolution and seasons
Answer:
The Earth's revolution not only affects but actually causes the temperature conditions that give us spring, summer, fall and winter seasons. Which season it is depends on whether you live in the Northern or Southern Hemisphere because the Earth's axis tilts toward one of the two as it moves around the sun.
A object moving in 3m radius circular path,
when it reaches the beginning point again, then
the displacement in m equals:
Answer:
0
Explanation:
Physically:
Beginning point means initial point so you're basically going into circles which means a displacement of zero.
Mathematically:
[tex]d = x _{f} - x _{i}[/tex]
We know
[tex]x _{f} =x _{i}[/tex]
So we get
[tex]d = x _{f} - x _{f}[/tex]
[tex]d = 0[/tex]
If the gravitational force disappeared , Earth would break away from its orbit and continue travelling in a ..............line into space.
A dog barking at the sound of the postal carrier delivering mail is reacting to what type of cue?
A. External
B. Internal
Answer:
A. External
Explanation:
External stimulus includes touch/pain, vision, smell, taste, and sound.
Assume the roller coaster experiences no friction. What would be the speed of the roller
coaster at point F? Defend your answer in 1-2 sentences.
The roller coaster experiences no friction, the speed of the roller
coaster at point F is mathematically given as
v= 65.72 m/s
What would be the speed of the roller coaster at point F?Generally, the equation for the Mechanical enegy is is mathematically given as
ME = mgh + 1/2mv^2
Therefore
ME= 80*9.8*200 + 1/2*80*20^2
ME= 172800 J
In conclusion, the speed of the roller coaster at point F is
ME=1/2*m*V^2
172800 = 1/2*80*V^2
v= 65.72 m/s
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Air is a good medium for sound waves because it is
Answer:
air does not have a modulus of rigidity.
Explanation:
Since air is completely elastic medium, that is, it does not have a modulus of rigidity, therefore sound waves in air are longitudinal.
Two satellites some distance apart exert a gravitational force on each other of 20 newtons (N). Each satellite has a mass of 300 kilograms (kg). If the satellites remained tho same
distance apart but each had a mass of 600 kg, what would the force of gravity between them be?
•5N
•10N
•40N
•80N
If the masses of the objects are both doubled to 600 kg each, the force between them will be 40N.
Newton's law of Universal GravitationThe Newton's law of universal gravitation states that, force of gravity between two objects is directly proportional to the product of the masses and inversely proportional to the square of the distance between them.
As such;
F = Km1m2/r^2
If the masses of the objects are doubled but the distance of separation remains the same, it follows that the force between the masses will also be doubled. Hence, if the masses of the objects are both doubled to 600 kg each, the force between them will be 40N.
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What is the relationship between Earth’s revolution and seasons. What evidence can you provide to explain how Earth’s revolution determines the seasons?
Think!!!! Write Claim, Reasoning and add evidence.
Answer:
Earth's tilted axis causes the seasons. Throughout the year, different parts of Earth receive the Sun's most direct rays. So, when the North Pole tilts toward the Sun, it's summer in the Northern Hemisphere. And when the South Pole tilts toward the Sun, it's winter in the Northern Hemisphere.
Explanation:
It's all about Earth's tilt!
Claim:- Many people believe that Earth is closer to the Sun in the summer and that is why it is hotter. And, likewise, they think Earth is farthest from the Sun in the winter.
Although this idea makes sense, it is incorrect.
It is true that Earth's orbit is not a perfect circle. It is a bit lop-sided. During part of the year, Earth is closer to the Sun than at other times. However, in the Northern Hemisphere, we are having winter when Earth is closest to the Sun and summer when it is farthest away! Compared with how far away the Sun is, this change in Earth's distance throughout the year does not make much difference to our weather.
There is a different reason for Earth's seasons.
Reasoning:- earth's axis is an imaginary pole going right through the center of Earth from "top" to "bottom." Earth spins around this pole, making one complete turn each day. That is why we have day and night, and why every part of Earth's surface gets some of each.
Earth has seasons because its axis doesn't stand up straight.
But what caused Earth to tilt?
Long, long ago, when Earth was young, it is thought that something big hit Earth and knocked it off-kilter. So instead of rotating with its axis straight up and down, it leans over a bit.
By the way, that big thing that hit Earth is called Theia. It also blasted a big hole in the surface. That big hit sent a huge amount of dust and rubble into orbit. Most scientists think that that rubble, in time, became our Moon.
As Earth orbits the Sun, its tilted axis always points in the same direction. So, throughout the year, different parts of Earth get the Sun’s direct rays.
Sometimes it is the North Pole tilting toward the Sun (around June) and sometimes it is the South Pole tilting toward the Sun (around December).
It is summer in June in the Northern Hemisphere because the Sun's rays hit that part of Earth more directly than at any other time of the year. It is winter in December in the Northern Hemisphere, because that is when it is the South Pole's turn to be tilted toward the Sun.
Earth's lopsided orbit
Evidence- Earth's perihelion (point closest to Sun) = 91,400,000 miles from Sun
Earth's aphelion (point farthest from Sun) = 94,500,000 miles from Sun
While that is a difference of over 3 million miles, relative to the entire distance, it isn’t much.
And, believe it or not, aphelion (when Earth is farthest from the Sun) occurs in July, and perihelion (when we are closest) occurs in January. For those of us who live in the Northern Hemisphere where it's summer in July and winter in January, that seems backwards, doesn't it? That just goes to prove that Earth's distance from the Sun is not the cause of the seasons.
Answer:
Earth's tilted axis causes the seasons. Throughout the year, different parts of Earth receive the Sun's most direct rays. So, when the North Pole tilts toward the Sun, it's summer in the Northern Hemisphere. And when the South Pole tilts toward the Sun, it's winter in the Northern Hemisphere.
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by observing ___ we can determine what kind of atoms or molecules are present and their relative abundance
The kind of atoms or molecules are present and their relative abundance can be determined by observing wavelengths.
What is wavelength?Wavelength is the distance between adjacent crest or trough of the wave.
The light travels in the form of wave and particle. It behaves like both. Light ray consist energy of the photons. The kind of atoms or molecules present behave like particle and they have particular wavelength.
Thus, by observing wavelength , we can determine the kind of atoms or molecules are present and their relative abundance.
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A block of mass 8 m can move without friction
on a horizontal table. This block is attached
to another block of mass 34 m by a cord that
passes over a frictionless pulley.
If the masses of the cord and the pulley
are negligible, what is the magnitude of the
acceleration of the descending block?
Answer:
Let M1 = 8 kg and M2 = 34 kg
F = M a = (M1 + M2) a
F = M2 g the net force accelerating the system
M2 g = (M1 + M2) a
a = M2 / (M1 + M2) g = 34 / (42) g = .81 g = 7.9 m/s^2
What is standard one kilogram?
Explanation:
Standard one kilogram is the mass of a platinium- iridium cylinder having equal diameter at the height kept at 0⁰C at the International bureau of Weights and Measures, held in paris in France. The accurate copies of atandard one kilogram are prepared to Measures mass in different countries.....
[tex]....[/tex]
It is defined as the mass of a particular international prototype made of platinum-iridium and kept at the International Bureau of Weights and Measures. It was originally defined as the mass of one liter (10-3 cubic meter) of pure water. At the Earth's surface, a mass of 1 kg weighs approximately 2.20 pounds (lb).
A quartz crystal vibrates with a frequency of 33,621 Hz. What is the period of the crystal's motion?
______ ms
Answer:
.0297 ms
Explanation:
period = 1 / f = 1 / 33621 = .0000297 seconds= .0297 ms
What fitness components can impact a soccer players performance?
A) Dribbling, passing, shooting and heading
B) Physical, emotional, and cognitive factors
C) Cardiovascular, muscular strength/power, muscular endurance
D) None of the above
Answer:
C) Cardiovascular, muscular strength/power, muscular endurance
Explanation:
I did take the quiz
Answer:
C) Cardiovascular, muscular strength/power, muscular endurance
Explanation:
An object weighing 75 N is dropped from the top of a building and falls a distance of 28 m to the ground. How much work does gravity do on the object from the time it is dropped to the time it hits the ground?
Which of the objects below would experience lift?
Answer:
the first one, The object moving through air
Particles q1, q2, and q3 are in a straight line. Particles q1 = -5.00 x 10^-6 C, q2 = +2.50 x 10^-6 C, and q3 = -2.50 x 10^-6 C. Particles q1 and q2 are separated by 0.500 m. Particles q2 and q3 are separated by 0.250 m. What is the net force on q2
When q₂ is place between q₁ and q₃, the net force on q₂ is 0.486N.
What is the electrostatic force?The electrostatic force of attraction or repulsion is proportional to the product of magnitude of charges and inversely proportional to the square of distance between them.
Force on q₂ due to q₁
F₁₂ = kq₁q₂ / r₁₂²
Substitute the values provided , we get
F₁₂ = 9 x 10⁹ x 5 x 10⁻⁶ x 2.5 x 10⁻⁶ / (0.5)²
F₁₂ = 0.414 N
Force on q₂ due to q₃ placed at distance 0.25m
F₂₃ =kq₂q₃ / r₂₃²
Substitute the values, we get
F₂₃ = 9 x 10⁹ x 2.5 x 10⁻⁶ x 2.5 x 10⁻⁶ / (0.25)²
F₂₃ = 0.9N
The net force F =F₂₃ -F₁₂
F =0.9 - 0.414 = 0.486 N
Thus, the net force of q₂ is 0.486 N.
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Answer:
0.45
Explanation:
trust me
Scientists use equations to model how fast a rocket needs to go to launch a satellite into orbit. What is a limitation of this model?
A limitation of this model is that it can't be tested practically in order to check its validity.
What is a model?Models are representations of scientific data that can help in defining, analyzing, and communicating many concepts. These models are developed in order to do analysis, specification, design, verification, and validation of a system.
So we can conclude that a limitation of this model is that it can't be tested practically in order to check its validity.
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There are five appliances: an air conditioner (1000 W), a refrigerator (450 W), a washing machine (500 W), a popcorn popper (250 W), and a stereo (20 W). What are the three highest-power appliances that can be plugged into two outlets and be running at the same time? The maximum current capacity of the circuit is 15 A, and the outlets provide 120 V. (HINT: Find the current of each appliance). SHOW YOUR WORK.
The three highest-power appliances that can be plugged into two outlets and be running at the same time are air conditioner, washing machine and popcorn popper.
Current of each appliance
The current of each appliance is calculated as follows;
P = IV
I = P/V
air conditioner (1000 W), I = 1000/120 = 8.33 A
refrigerator (450 W), I = 450/120 = 3.75 A
washing machine (500 W), I = 500/120 = 4.17 A
popcorn popper (250 W), I = 20/120 = 0.17 A
The three highest-power appliances that can be plugged into two outlets;
8.33 A + 4.17 A + 0.17 A = 12.67 A, which is less than 15 A.
Thus, the three highest-power appliances that can be plugged into two outlets and be running at the same time are air conditioner, washing machine and popcorn popper.
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PLEASE HELP 100 POINTS! Please fill in the scale distance from sun and diversion factor, listing off the numbers works
Solved your another question same like this with scaling to Cm this time we go with metre(m)
Scale factor
1km=10³m1m=10^{-3}kmMercury
58000mVen us
108000mEarth
150000mMars
228000mJupiter
778000mSaturn
1430000mUranus
2870000mNeptune
4500000mNeed help asap!!science foundations
The most effective way to reduce waste is to not create it in the first place.
True
False
Answer:
True
Explanation:
If there isnt any waste it would reduce the quantity however the waste that is present needs to be dealt with so......
Which landscape feature can be caused by chemical
weathering?
OU-shaped valley
O Basalt columns
O Limestone caves
Answer: Limestone Caves
Explanation: The most common feature that can be caused purely by chemical weathering is Karst Landscape, which can lead to caverns and sinkholes.
How far does the runner travel in 10 s going a velocity of 4m/s
Answer:
40 m
Explanation:
4 m/s * 10 s = 40 m
( see how the 's' cancels out and you're left with "m" as your answer?)