The frequency of the speed of the electron is equal to 1.79 ×10¹⁶ s⁻¹.
What is the centripetal force?When an object having mass undergoes a uniform circular motion, then it is held by centripetal force in the circular path. The centripetal force can be expressed in the the following equation:
F = mω²R
where m is the mass of the object, 'v' and R are the speed and radius of the circular path respectively.
The angular frequency of the electron can be expressed as:
v = 2π f
Then the centripetal force will be equal to:
F = m (2π f)² R
F = m 4 π² f² R
[tex]f = \sqrt{\frac{F}{4\pi ^2m R} }[/tex]
Given, the attractive force of the nucleus and electron, F = 7.45 ×10⁻⁸ N
The radius of the orbit, r = 5.89 × 10⁻¹¹ m
[tex]f = \sqrt{\frac{7.45\times 10^{-8}}{4 \times (3.14)^2\times 9.1 \times 10^{-31}\times 5.89\times 10^{-11}} }[/tex]
f = 1.79 ×10¹⁶ s⁻¹
Therefore, the frequency of the linear speed of an electron is 1.79 ×10¹⁶ s⁻¹.
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The mass of a substance was found to be 8.2 g. By using the water displacement method the volume was found to be 3.6 cm3. Calculate the density
Answer:
D= 2.3g/ml
Explanation:
how does light determine whether it acts as a particle or a wave?
Mass= 386g volume= 20cm3 what is the density=
If the labor force of 155 million people is growing by 1.2 percent per year, how many new jobs have to be created each month to keep unemployment from increasing?
Answer:0.155 million jobs have to be created each month to keep unemployment from increasing.
Explanation:
Population of the labor force = 155 million
Percentage increase of labor force in an year = 1.2 % of 155 million
Percentage increase in labor force in a month = [tex]\frac{1.2 \%}{12}=0.1 \%[/tex] of 155 million
Jobs required to be created each month = population increase each month
[tex]=155 million\times \frac{0.1}{100}=0.155 million[/tex]
0.155 million jobs have to be created each month to keep unemployment from increasing.
Final answer:
To maintain the current unemployment rate with a labor force of 155 million growing at 1.2% annually, 155,000 new jobs need to be created each month.
Explanation:
To determine how many new jobs have to be created each month to keep unemployment from increasing, given a labor force of 155 million people growing at 1.2 percent per year, first, calculate the annual growth of the labor force. Multiply the current labor force by the growth rate:
155 million * 0.012 = 1.86 million new entrants into the labor force per year.
To find the monthly job creation requirement, divide this annual number by 12:
1.86 million / 12 = 155,000 jobs per month.
Therefore, 155,000 new jobs need to be created each month to keep unemployment from increasing as the labor force grows.
How can the rate of a reaction be increased?
lowering the temperature
decreasing the amount of reactants
having more surface area
diluting a solution
Answer:
C. Having more surface area
When the reaction involves solids, an increased surface area of it will result in an increased reaction rate. The higher the temperature, the faster the reaction rate will be too. Lowering the temperature, decreasing the amount of reactions, and diluting a solution will decrease the reaction rate
Answer:
having more surface area
Explanation:
Someone help I’m dumb
Answer:
Meet and show
Explanation:
How would you measure the volume of a sponge
Select answer about motion and newtons law and explain why it's correct 23POINTS NEED ASAP
The train would need the greatest amount of force due to weight! If you think of it, a baseball won't need much force to stop it, but if you have a heavy train, it will need excessive force to stop the train. The answer would be #3
I hope this answer helps!
Sorry if it doesn't make sense, as I don't know that much about physics! I am just thinking of what makes sense.
the theory that all matter consists of constantly moving particles is known as the
a. physical theory of matter
b. attraction theory of matter
c. theory of states of matter
d. kinetic theory of matter
6. Velocity is a ____________. a) vector b) value c) arrow d) none of these
what are ten derived quantities
In the past, the intensity of the Earth's magnetic field was _____. A. greater B. weaker C. same D. evidence is inconclusive?
I'm sure A is the right answer
a croquet ball, after being hit by a mallet,slows down and stops. do the velocity and acceleration of the ball have the same signs
Choose one of the six fitness related components that are used in gymnastics.
Agility
Speed
Reaction Time
Balance
Coordination
Power
how is a pure substance different from a mixture? A. mixtures can be separated by physical means B. Pure substances are made up of mixtures C. A pure substance is heterogeneous D. A mixture is made of one substance
Mixtures can be separated by physical means is the statement that describes how a pure substance different from a mixture.
A pure substance is a form of matter that has a definite (constant) composition and distinctive properties.
On the other hand, a mixture is a combination of two or more substances in which they retain their properties.
Any mixture can be formed and then separated by physical means into its pure components without changing the identity of those components.
That is, there are different methods to separate a mixture into its different components, these methods are physical since they do not alter the properties of the components.
These physical methods are: Filtration, decantation, distillation among others, and are based on the physical state, characteristics and properties of the components of the mixture, to use the most appropriate technique.
Therefore, we can conclude that mixtures can be separated by physical means is the statement that describes how a pure substance different from a mixture.
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Will give BRAINLIEST!
A limestone plateau has no surface water. All the water is pulled underground through cracks and crevices in the surface. What most likely will cause the underground of the plateau to change over time?
Physical weathering due to frost wedging
Physical weathering due to abrasion
Chemical weathering due to oxygen
Chemical weathering due to water
A limestone plateau has no surface water. All the water is pulled underground through cracks and crevices in the surface. What most likely will cause the underground of the plateau to change over time?
Physical weathering due to frost wedging
Physical weathering due to abrasion
Chemical weathering due to oxygen
Chemical weathering due to water Correct Answer
Answer: Chemical weathering due to water. fyi i did the test.
which of the following is not a process that forms metallic ore
I believe that this question has the following choices to choose from:
placer deposits
fossil compaction
hydrothermal solutions
igneous processes
Actually among all, I have never encountered an ore that formed due to fossil compaction. I suppose we can get minerals such as marble or lime but not ores. So the answer is:
fossil compaction (answer)
Your best answer is B
Why is it nessesary to have an independent variable that is changed by the experimenter during an experiment
Inertia increases as an object's _________ increases. mass volume acceleration velocity
I'll give brainliest just please help me
If the distance between two objects decreases, then the force of gravity will
Select one:
a. decrease.
b. increase.
c. stay the same.
d. depends on the objects.
When forces on an object are balanced the object will
Select one:
a. move in a random direction.
b. move in the direction of the force.
c. not move.
d. depends on what the object is.
What type of force will cause an object to change its speed?
Select one:
a. balanced
b. unbalanced
c. strong
d. weak
Which is larger than a single atom?
a. magnetic domain
b. electron
c. neutron cloud
d. proton
Answer:
c
Explanation:
4. A person can swim 0.65 m/s in still water. She heads directly south across a river 130 m wide and lands at a point 88 m [W] downstream. K/U T/I A (a) Determine the velocity of the water relative to the ground. (b) Determine the swimmer’s velocity relative to Earth. (c) Determine the direction she should swim to land at a point directly south of the starting point.
Answer:
speed of the person in still water = 0.65 m/s
width of the river = 130 m
distance covered downstream = 88 m
a) let the speed of the water be = s
The time to cover two displacements would be equal.
[tex] \frac{130m}{0.65m/s}=\frac{88m}{s}\\ \Rightarrow s = 0.44 m/s[/tex]
b) Swimmer's velocity relative to earth would be:
[tex] v = \sqrt{0.65^2+0.44^2} = 0.78 m/s[/tex]
c) The swimmer should swim south of East to land at a point directly south of the starting point.
a stone is dropped from a cliff. after it has fallen 10m what is the stones velocity
Answer:
V=14,1421 m/s
Explanation:
it's simple.
Velocity increases with the gravity acceleration.
There's a formula called Torricelli's equation, and it is as it follows:
V^2 = Vo^2 +2.a.s
where V is the speed you wish to find
Vo is the initial speed
a is the acceleration, in this case, the gravity's one
s is the space it moved.
So, here we go
Vo=0
a=10 or 9.81 (some schools use 10 to simplify the math)
s=10
So, using g as 10
V^2 = 0 +2.10.10
V^2=200
V=14,1421 m/s
To calculate the object's speed, simply multiply the gravitational acceleration by the amount of time since release (or velocity). In other words, velocity is equal to -9.81 m/s2 * time, or V = gt.
What velocity of stone dropped from a cliff?When dropped, a rock or other object will pick up speed quickly. According to measurements, an object falling 1 foot (ft) will move at a speed of 8.02 feet per second (ft/s).
A 4 ft (1.22 m) drop causes an object to travel at a speed of 16.04 ft/s. The velocity obtained is 22.70 ft/s after an 8-foot descent. When a stone is hurled upward, its velocity will be zero as it reaches its highest point, since the stone briefly comes to rest there.
Therefore, The final speed in a descending direction is 14 meters per second.
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True or false is the transformation of chemical energy to radiant and thermal energy when a flashlight is turned on is an example of inefficiency
Complete this sentence. If mass remains the same while the volume of a substance ________, the density of the substance will_______________. decreases, decrease increases, decrease increases, stay the same decreases, stay the same
Answer:
increases, decrease
Explanation:
The density of a body is the measure of mass concentration of a material. It is an intrinsic property which is constant. It is the ratio of mass and volume
m = Mass
v = Volume
Density
[tex]\rho=\frac{m}{v}[/tex]
This means that density is inversely proportional to volume.
So, if volume increases density will decrease.
Does A= 6.4 B=12 C=12.2 Form a RIGHT TRIANLGE?
The main offenders in terms of greenhouse gas emissions
why is the mass of an atom’s electrons not included in the atom’s mass number
a hollow tennis ball and a lead filled tennis ball are dropped off a tall building. which reaches the ground first, the hollow ball, or the lead filled ball
Most earthquakes occur in areas close to where tectonic plates meet. There are earthquakes in San Francisco. What can be concluded from this information?
A) San Francisco is far away from an area where tectonic plates meet.
B) San Francisco is close to an area where tectonic plates meet.
C) San Francisco is close to Luzon, an island in the Philippines.
D) San Francisco is likely to experience a volcanic eruption in the near future.
Answer:
B) San Francisco is close to an area where tectonic plates meet.
Explanation:
According to the question most earthquakes occur in areas close to where tectonic plates meet. The best option that can be concluded from the earthquakes occurring in Francisco is that San Francisco is close to an area where tectonic plates meet. The close proximity of San Francisco to where tectonic plates meets will likely cause earthquake in that region.
Generally, the earth is divided into different plates. These tectonic plates might be oceanic crust or continental crust. The plates are constantly moving. The plates might be moving away from each other(divergence) , colliding with each other(convergence) or moving past each other (transform).
The area where these plates meets are usually area of potential earthquakes. This boundary are area of minor or major earth quake. Usually , aesthenospheric material are introduce to the surface through this boundary.