Dr. Lee made his laboratory become one of the best laboratories in the world, through his experiment works.
What is meant by chemical dynamics ?Chemical dynamics is defined as the branch of science that deals with the study of mechanisms of chemical reactions and the rate of reactions.
Here,
Dr. Yuan Lee was a famous chemist at the University of California at Los Angeles. He shared the Nobel prize for Chemistry in 1986 with two of his colleagues in the field of development of chemical dynamics.
Dr. Lee had contributed an important ideas in the development of chemistry and the dynamics of chemical reactions, which eventually led to the Nobel Prize.
Dr. Lee was much interested in the field of ion-molecule reactions and the chemical dynamics during the research period itself. He published his thesis at the University of California, which involved the chemical ionization reactions of alkali metals. This brought him more acceptance and eventually more and more achievements at the University.
Even after winning the Nobel Prize in 1986, he continued to research in chemical reaction dynamics and won significant achievements. His eminent works in the field of experiments and dynamics in chemistry, Dr. Lee's laboratory became one of the best laboratories in the world.
Hence,
Dr. Lee made his laboratory become one of the best laboratories in the world, through his experiment works.
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please help !!!!!!!!!!!!!!
Randi has become very proficient at using Photoshop, but as a photojournalist cannot ethically alter photos except to do what?
fix people’s skin if they have blemishes
get rid of clutter in the background
change people’s hair color
adjust brightness
Answer:
the answer will be adjust brightness
Explanation:
thank you
The content of a photograph must not be altered in Photoshop or by any other means. No element should be digitally added to or subtracted from any photograph.
Do not manipulate images or add or alter sound in any way that can mislead viewers or misrepresent subjects. Do not pay sources or subjects or reward them materially for information or participation. Do not accept gifts, favors, or compensation from those who might seek to influence coverage.
In addition, it is unethical for individuals and institutions to alter images in order to fool their audience.
Base quantity and among following is 1 electric charge 2amount of substance 3 area 4 volume
Area is the base quantity. A base quantity is one of the physical quantities that make up a traditionally selected subset, and it is one that cannot be stated in terms of the other physical quantities in the subset.
Is space a fundamental quantity?Area can therefore be stated using square meters (mm=m2) as a derived number in terms of SI base units. ( m × m = m 2 ) . The same is true for volume, which is a derived quantity that can be expressed in cubic meters (m3).A base quantity is one of the physical quantities that make up a traditionally selected subset, and it is one that cannot be stated in terms of the other physical quantities in the subset.A base quantity is one of the physical quantities that make up a traditionally selected subset, and it is one that cannot be stated in terms of the other physical quantities in the subset. There are seven basic fundamental quantities: length, mass, time, electricity, substance amount, light intensity, and temperature.To learn more about Base quantity refer to:
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In your own words describe the structure in and the functions of the cardiovascular system include the major organs and how they work within the body system what are the systems of a failure of this body system system
The circulatory system (cardiovascular system) pumps blood from the heart to the lungs to get oxygen
The heart, blood arteries, and blood make up the cardiovascular system. Its main job is to carry de-oxygenated blood back to the lungs and to carry nutrients and oxygen-rich blood to all regions of the body. Serious health issues may arise from abnormalities or damage to any one or all of the cardiovascular system's components. Coronary artery disease, heart attacks, high blood pressure, and stroke are common disorders that can have an impact on the cardiovascular system. In the body, there are two blood circulation systems. The systemic circulatory system comes initially. This is the primary blood circulation system that carries blood to all of the body's organs, tissues, and cells.
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How can you tell how objects differ in density?
Answer:
You have to compare the densities,
Explanation:
To find density:
1. Measure the object's weight
2. Divide the mass by the volume
You wish to place a spacecraft in a circular orbit around the earth so that its orbital speed will be 4.00×10^3m/s. What is this orbit's altitude above the earth's surface?
The orbit's altitude above the earth's surface is 2.29 x 10^7 meters.
What is altitude?Altitude or height is a distance measurement, usually in the vertical or "up" direction, between a reference datum and a point or object.
We are given that
Orbital speed= 4.00×10^3 m/s
We have to find the radius of orbit of spacecraft.
We know that
Gravitational constant = 6.67x 10^-11 m³ kgs²
mass of earth = 5.972 x 10^24 kg
orbital speed = [tex]\sqrt{ \frac{GM}{r}[/tex]
Where G= Gravitational constant
M=Mass of earth
r=Radius of orbit
Substituting the values in the formula and evaluating, we have
r = 2.29 x 10^7 meters
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What is the moment of inertia of a 4.2-kg uniform cylindrical grinding wheel of radius 32 cm?
The moment of inertia of the uniform cylindrical grinding wheel is 2,150 kgm².
What is the moment of inertia?
This refers to the angular mass or rotational inertia can be defined with respect to the rotation axis, as a property that shows the amount of torque needed for a desired angular acceleration or a property of a body due to which it resists angular acceleration. The unit is kgm².
From the question:
Mass,M =4.2kg
Radius, R=32Cm
The formula for calculating the moment of inertia for uniform cylindrical grinding wheel:
moment of inertia, I =1/2MR²
I =[tex]\frac{1}{2}[/tex] * 4.2 * 32²
=2,150.4 kgm²
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HELP PLEASE ASAPPPP Draw a Free-Body Diagram for getting out of a seat . You are to explain how you get out of your chair in terms of EACH of Newton's Laws of Motion.
The forces that acts on the person who sits on a chair is balanced.
What is a free-body diagram?We know that the free body diagram shows the forces that are acting on an object. We know that if the forces that are acting on an object are balanced, then the object does not move or accelerate.
If you sit on a chair, your weight and the normal reaction are exactly balanced as you sit on the chiar hence you do not move from the chain. As you rise from the chair, there is a small change in the forces as you move forward.
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As part of astronaut training, a prospective astronaut is spun around in a human centrifuge such that the candidate experiences a centripetal acceleration that is 2.5 times the acceleration due to gravity on the surface of the earth. If the candidate is 9.98 m from the center, determine the candidate's speed in meters per second.
The speed of the astronaut is determined as 15.64 m/s.
What is centripetal acceleration?
The centripetal acceleration of an object is the rate of change of tangential velocity of the object around a circular track.
Mathematically, the formula for centripetal acceleration is given as;
a = v²/r
where;
v is the linear speed of the astronautr is the radius of the circular pathMake v the subject of the formula and determine the candidate's speed in meters per second.
v² = ar
v = √ar
where;
a is the centripetal acceleration = 2.5g = 2.5 x 9.8 m/s²v = √(2.5 x 9.8 x 9.98)
v = 15.64 m/s
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By what fraction would the diameter of the moon appear shortened to an observer in a rocketship travelling at a speed of 300km/sec with respect to the moon
The diameter of the Moon is around one-fourth (27.2%) of the diameter of the Earth.
what is diameter ?
A diameter of a circle would be any straight line segment that goes through the Centre of the circle and has ends that are on the circle. It can alternatively be described as the circle's longest chord. Both definitions are true for the diameter of a sphere.
In current parlance, the length d of a diameter is also referred to as the diameter. In this context, the diameter is used rather than the diameter (which corresponds to the line segment itself), since all diameters of a circle or sphere share the same length, which is twice the radius.
3476 km is the diameter of the moon (equator) 3472 kilometres
The diameter of the Earth is 12756 km at the equator and 12742 km at the poles.
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A 11.1 kg block of steel is pushed at a constant speed across
a Teflon surface. What is the normal force on the block?
(Answer to one decimal place with no units.)
The normal force on the block of steel of mass 11.1Kg at constant speed is 108.8 N.
Mass of steel block = 11.1 Kg
Normal force on the block = Force exerted by the surface on the block
= mass × acceleration due to gravity
= m × g
Taking the value of g as 9.8 m/s
= 11.1 × 9.8
= 108.78 N
By converting the answer to one decimal place, round the value to
= 108.8 N
Thus, the normal force on the block of steel by the Teflon surface round to one decimal place is 108.8 N.
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A boy pulls a wagon with a force of 6 N east, and another boy pulls the wagon with a force of 4 west. What is the net force?
A. 0 N
B. 10 N east
C. 10 N west
D. 2 N east
Answer: My answer is 2 N East
Explanation:
I chose this answer because since the 6 and 4 don't balance each other you have to subtract since it's unbalanced. So 6-4=2.
What is the cost per month to operate an A.C. 10hours per day whose power is 3kW and 1KWH cost 79francs
The cost of operation for an A.C for 10 hours per day for a month will be 71,100 francs.
What is Power?Power is the amount of energy transferred or converted per unit time. The unit of power is the watt, equal to one joule per second. Power is a scalar quantity.
Cost of operation for 10 hours a day;
Daily consumption = 3kW x 10 hours
Daily Consumption = 30kW
Since 1kWH = 79 francs;
Daily consumption amount = 30 x 79 francs
Daily consumption amount = 2,370 francs
Therefore, the monthly consumption (using 30days) will be;
2,370 francs x 30 = 71,100 francs
In conclusion, 71,100 francs will be spent in a month (30 days) to run the 3kW rated A.C for 10 hours a day at 1kWH.
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What is the magnitude of the momentum of a motorcycle of a mass of 100 kg at rest What is its momentum if this motorcycle when it travels at 40 m s?
The magnitude of a momentum of a motorcycle of a mass of 100kg at rest stage is 0kg-m/sec and momentum of a motorcycle is 4000kg-m/sec when it travels with 40m/sec speed.
We know very well that momentum is defined as the quantity of the motion of the body.
Momentum is represented by the product of mass and velocity, or in other words p=mass × velocity
Momentum is called as a vector quantity. It means it has proper magnitude and proper direction.
From momentum, impulse is also calculated.
At rest stage velocity of motorcycle is 0m/sec
Therefore, momentum=100×0=0Kg-m/sec
Now, when motorcycle is moving with speed 40m/sec, then momentum is
=>p=100kg×40m/sec
=>p=4000kg-m/sec
There are various laws in physics which are derived by the conservation of momentum.
Hence, magnitude of momentum are 0kg-m/sec and 4000kg-m/sec.
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A roller coaster starts down a slope, its velocity is 4 m/s. But 3 seconds later, its velocity is 22m/s in the same direction. What
is its acceleration? Was this acceleration positive or negative? Why? Show your work and units. (use GRESA format)
The acceleration of the object is 6 m/s^2 in the positive direction.
What is the acceleration?We know that the term acceleration has to do with the rate of the change of the velocity with time. Now we know know that its velocity is 4 m/s. But 3 seconds later, its velocity is 22m/s in the same direction.
Thus using;
a = v - u/t
a = acceleration'
v = final velocity
u = initial velocity
t = time taken
Thus;
a = 22 - 4/3
a = 6 m/s^2
Thus we have that the acceleration is increasing in the positive direction.
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a heater has a power of 2500W. The heater is turned on for 180 seconds. Calculate the energy transferred by the heater
The energy transferred by the heater that has a power of 2500W and is turned on for 180s is 450,000J.
How to calculate energy?Electrical energy is the energy made available for consumption or consumed in the form of electricity or electric power.
Electrical energy can be calculated as follows:
Electrical energy = Power x Time.
The total amount of electrical energy used depends on the total power used by all electrical devices and the total time they are used in the home.
According to this question, a heater has a power of 2500W and is turned on for 180 seconds. The energy can be calculated as follows;
E = 2500W × 180s
E = 450,000J
Therefore, 450,000J is the energy transferred to the heater.
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Suppose you drop a book. As the book is falling to the ground, which of the following statements is true?
A. The magnitude of the force that the Earth exerts on the book is larger than the magnitude of the force that the book exerts on the Earth
B. Because the book is in free fall, there is no force between the Earth and book.
C. The magnitude of the force that the Earth exerts on the book is smaller than the magnitude of the force that the book exerts on the Earth
D. The magnitude of the force that the Earth exerts on the book is the same as the magnitude of the force that the book exerts on the Earth
The magnitude of the force that the Earth exerts on the book is the same as the magnitude of the force that the book exerts on the Earth. Thus, the correct option is D.
What is Newton's third law of motion?The Newton's third law of motion states that for each and every action i.e., force in nature there is an equal and opposite reaction. If an object exerts force on another object, the another object will also exert an equal and opposite force on the first object. In other words, forces result from interactions of object.
In this case, as the book falls on the ground, the force will is exerted on the ground by the book is same in magnitude to the force exerted by the book on the ground.
Therefore, the correct option is D.
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write the equation to show how force and acceleration are related
F = ma, or force is equal to mass times acceleration, is the equation used in Newton's second law of motion to demonstrate the relationship between force and acceleration.
What is force and acceleration?A force pushes or pulls an object. The total of all forces acting on an object is known as the net force. An object will change speed in the direction of the net force when there is one applied to it. The object's acceleration reveals how much it accelerates or decelerates.
Newton's second law of motion explains the connection between force and acceleration. They are of the same size. The acceleration of an object rises by the same amount as the force being applied to it. Force is simply defined as mass times acceleration.
What is the acceleration force formula and Can you have acceleration without a force?Mass (kg) times acceleration (m/s2) equals force (N). Therefore, an object with constant mass will accelerate in direct proportion to the applied force.
There won't be any acceleration if there are no external forces operating on the object. The object will move at a constant speed if there is no acceleration. We may examine Newton's second law and the acceleration formula mathematically.
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under what conditions of temperature and pressure would you expect gases to obey the ideal-gas equation?
Answer:
Gases obey the ideal-gas law at high temperatures and low pressures.
Explanation:
Why are yeast good organisms for studying natural selection?
The change in a population's heritable features over generations is a major evolutionary mechanism. The yeast are good organisms for studying natural selection because they can reproduce quickly.
What is natural selection?The natural selection is defined as the mechanism through which living creature populations adapt and change. It states that the organisms which are able to survive and reproduce with the changing environment conditions are selected by nature.
The species which are not possible to survive are eliminated. The genes responsible for the survival of an organism are passed on to the successive generations.
Yeast is ideal for laboratory evolution experiments due to its short generation time and the separate haploid and diploid phases of its life cycle. It is cheap, its genetic material is easy to manipulate and it also grows quickly. Yeast cells are a good model organism.
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A uniform solid cylindrical flywheel has a mass of 50 kg and a radius of 40 cm. The flywheel begins to rotate faster with an acceleration of 1.5 rad/s2. The kinetic energy of the flywheel after 1 minute of rotation is:
A. 16.2 KJ
B. 180 KJ
C. 40.5 KJ
D. 32.4 KJ
The kinetic energy of the flywheel after 1 minute of rotation, given that it has a mass of 50 and radius of 40 cm is 32.4 KJ (Option D)
How do I determine the kinetic energy?We'll begin by obtaining the velocity of the flywheel. This is shown below:
Radius (r) = 40 cm = 40 / 100 = 0.4 mAcceleration (a) = 1.5 rad/s² = 1.5 × 0.4 = 0.6 m/s²Time (t) = 1 minute = 1 × 60 = 60 sVelocity (v) = ?v = at
v = 0.6 × 60
v = 36 m/s
Finally, we shall determine the kinetic energy of the flywheel. Details below:
Mass (m) = 50 KgVelocity (v) = 36 m/sKinetic energy (KE) =?KE = ½mv²
KE = ½ × 50 × 36²
KE = 25 × 1296
KE = 32400 J
Divide by 1000 to express in KJ
KE = 32400 / 1000
KE = 32.4 KJ
Thus, the kinetic energy is 32.4 KJ (Option D)
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Question 2
A bullet is shot horizontally at 207 m/s and it lands 192 m away. How high was the gun
above the ground? (no negative sign)
1 p
The height at which the gun is being held above the ground is 3.969 m.
What is the height above the ground?
In motion of object in physics and mathematics, we know that the formula for time taken is,
Time = Distance/Velocity
We are given;
Velocity; v = 207 m/s
Distance; d = 192 meters
Thus,
Time taken = 192/207
= 0.927 seconds
Due to acceleration due to gravity, the displacement of bullet along vertical direction y is gotten from newtons equation of motion,
y = ut + ¹/₂gt²
where,
u is initial velocity = 0 m/s
Thus,
y = 0 + ¹/₂(9.8)(0.9)²
y = 3.969 m
Thus, the height at which the gun is being held above the ground is 3.969 m.
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a ball has a mass of 6 0 kg and a velocity of 10 ms what is its momentum
A ball has a mass of 6 0 kg and a velocity of 10 ms, and its momentum: is p=6×2.2=13.2kg m/s. Q.
Mass, in physics, quantitative measure of inertia, fundamental assets of all rely. it is, in impact, the resistance that a body of remember gives to trade in its pace or position upon the application of pressure. The more the mass of a frame, the smaller the change produced with the aid of an applied force.
Mass is the amount of remembering in a physical frame. it is also a degree of the frame's inertia, the resistance to acceleration when a net force is applied. An item's mass additionally determines the electricity of its gravitational enchantment to different bodies. The SI base unit of mass is the kilogram.
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As part of astronaut training, a prospective astronaut is spun around in a human centrifuge such that the candidate experiences a centripetal acceleration that is 2.8 times the acceleration due to gravity on the surface of the earth. If the candidate is 11.05 m from the center, determine the candidate's speed in meters per second.
The candidate's speed (m/s), given that the candidate experiences a centripetal acceleration that is 2.8 times the acceleration due to gravity is 17.4 m/s
How do I determine the candidate's speed?We understood that the centripetal acceleration is related to speed and radius according to the following formula:
a = v² / r
Cross multiply
v² = ar
Take the square root of both sides
v = √ar
Where
v is the speeda is the centripetal accelerationr is the radiusWithe the above formula, we can determin the speed of the candidate. Details below:
Acceleration due to gravity (g) = 9.8 m/s²Centripetal acceleration = 2.8 × g = 2.8 × 9.8 = 27.44 m/s²Radius (r) = 11.05 mSpeed of candidate (v) =?v = √ar
v = √(27.44 × 11.05)
v = 17.4 m/s
Thus, the speed of the candidate is 17.4 m/s
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Response
Sheet-Investigation 2
A friend at another school sends you an email. In that
email your friend tells you that they are studying the
solar system in science class. Your friend is confused
about gravity.
They read in a science book that gravity is a force that
keeps planets in orbit around the Sun. But your friend
thought that gravity is the force that pulls things toward
the center of Earth. For example, when you drop a bail,
it falls down to the ground.
Your friend asked this question. Is it possible that both
these things could be true about gravity?
Write a reply to your friend. What would you tell your
friend to help him or her answer this question?
Of course, the majority of gravitational forces are too small to be felt. Only as an object's mass increases can gravitational forces be observed.
What is the Universality of Gravity?There are other objects besides the earth and the sun and other planets that interact gravitationally as well.All objects are subject to gravitational interactions, the strength of which is directly inversely proportional to the product of their masses.You are therefore gravitationally drawn to your lab partner, the desk you are working at, and even your physics book when you sit in your seat in the physics classroom.Gravity is a universal force that all things are attracted to in proportion to the product of their masses, according to Newton's ground-breaking theory.Everywhere there is gravity.Of course, the majority of gravitational forces are too small to be felt. Only as an object's mass increases can gravitational forces be observed.To learn more about gravity, refer to
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What is the momentum of a 6.0 kg ball bowling with 9 velocity of 2.0 Metre per second?
the momentum of the 6 kg ball moving with haste of 2m/ s is 12 kgm/s.
In the question, we're given,
Mass = 6 kg
haste = 2 m/ s
According to the Newton's alternate law of stir it states that the instigation is the product of mass and the haste of the flyspeck. This instigation can be said as the measure of stir of the object. It's a vector volume and it has both magnitude and direction. It can be transferred. As the instigation of the system is conserved when no external force is applied on the system.
In this case,
momentum( p) = mv
Then,
m = mass
v = haste
momentum = 6 * 2
momentum = 12 kgm/ s
Thus, the momentum of the 6 kg ball moving with velocity of 2m/ s is 12 kgm/s.
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true or false: the vast size of our solar system makes it impossible for a large, civilization-threatening asteroid or comet to collide with earth.
Answer:
False. We have had MANY asteroids and comets collide into the earth in the time the earth has been created.
Explanation:
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An object of mass 2kg moves in circles at radius 8m at uniform speed of 30m/s calculate. A_angular velocity B_ceritripetal force
The angular velocity is 3.75 m/s and the centripetal force is 225 N respectively.
The angular velocity of an object with respect to some extent is a degree of the way rapid that item actions through the point's view, within the feel of the way speedy the angular function of the item modifications. An instance of angular pace is a ceiling fan. One blade will whole a complete round in a certain amount of time T, so its angular speed with respect to the middle of the ceiling fan is twoπ/T.
Calculation:-
A. angular velocity ω = v/r
= 30 /8
= 3.75 m/s
B. Centripetal force = mv²/r
= 2×30²/8
= 225 N
There are 3 formulations we will use to find the angular velocity. the primary comes instantly from the definition. The angular pace is the rate of alternate of the position attitude of an object with respect to time, so w = theta / t, in which w = angular pace, theta = position attitude, and t = time.
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FRQ 2
Anthony's firm produces wrestling sweatpants in a perfectly competitive market. The table below shows Anthony's total variable cost. He has a fixed cost of $240, and the price per pair of sweatpants is $60 (seriously tho, $60 ? ? 1 {m} all for spirit wear and stuff, but let's be reasonable) Quantity 6 7 8 9 10 Total variable Cost $120 $145 $165 $220 $290 $390 a. Calculate the average total cost of producing 6 and then 9 sweatpants, respectively. Show your work.
b. Calculate the marginal cost of producing the tenth pair of sweatpants. $70
c. What is Anthony's profit-maximizing quantity? Use marginal analysis to explain your answer.
d. At the profit-maximizing quantity you determined in part (c), calculate Anthony's profit or loss. Show your work.
e. Anthony also produces hoodies at a loss in a perfectly competitive market. Draw a correctly labeled graph for Anthony's firm showing the following at a market price of $200.
i. Anthony's profit-maximizing quantity of hoodies
ii. Anthony's loss, completely shaded
The output at which MC and MR are equal is the maximum profit.
Explain about the Maximum profit?
When the final unit of sales (marginal revenue) equals the final unit of production's cost, the management has maximized profit (marginal cost). The production level at which MC = MR is known as maximum profit.
Profit = Total Revenue - Total Cost is a key component of the profit maximisation formula. In light of the fact that the first order—MR = MC—and subsequent orders are dependent upon one another, a company maximizes profit when MR = MC.
As an illustration, let's say you believe that at a price of $10, you can sell 200 items while racking up $1,000 in fixed expenses and $800 in variable costs. At this pricing point, there is a total revenue of $2,000 ($200 x $10). The profit is $200 due to the $1,800 total in expenses.
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A car moves due to east a distance of 80km for 2hr then heads due to north a distance 80 km for 1hr and changing direction due to west and cover a distance of 25km for 1hr what is the resultant displacement
The resultant displacement of the car is 97.1 km.
What is resultant displacement?
The resultant displacement of an object is the shortest distance between the initial position and final position of an object.
The initial displacement of the car = 80 km due east
The second displacement of the car = 80 km due north
The final displacement of the car = 25 km due west
The resultant displacement of the car is the shortest distance between the initial displacement of the car and the final displacement of the car.
resultant vertical displacement = 80 kmresultant horizontal displacement = 80 km - 25km = 55 kmresultant displacement = √(80² + 55²)
resultant displacement = 97.1 km
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5. Stas is pushing his car which has broken down. He does 3KJ of work against friction
and moves it a distance of 12m. How big is the friction force he has to push against?
6. Sam is a pole-vaulter who has a mass of 80kg. He vaults to a height of 4m.
a) How much work does he do?
b) How much kinetic energy will he have just before he lands?
c) When he lands, his trainers compress by 1cm. Calculate the average force acting
on his trainers as he lands.
If Stas is pushing his car which has broken down and does 3 KJ of work against friction and moves it a distance of 12m, the friction force is 250 N
W = F d
W = Work done
F = Force
d = Distance
W = 3 KJ = 3 * 10³ J
d = 12 m
F = W / d
F = 3 * 10³ / 12
F = 0.25 * 10³
F = 250 N
Therefore, the friction force he has to push against is 250 N
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