Answer:Migration
Explanation: People began to migrate to areas with less UV and cooler regions. Due to the fact there was less heat, their skin tones began to get lighter. An example is in Europe where the people are generally lighter and those countries have cooler climates compared to Africa where the climate is warmer and has darker skinned people. Hope this helped!
A laser source is replaced by a laser of the same color that is more powerful. How does the light of the second laser compare with the original laser?
The light of the second laser compare with the original laser in the following way: the light in the second laser absorbs more optical radiation.
What is a laser?A laser is device that produces a monochromatic, coherent beam of light.
A laser is created when electrons in the atoms in optical materials like glass, crystal, or gas absorb the energy from an electrical current or a light.
Therefore, it can be said that light of the second laser compare with the original laser in the following way: the light in the second laser absorbs more optical radiation.
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Why is the human population unique in its ability to affect the environment?
Our population is very large.
We use a lot of resources.
Our population is growing quickly.
All of the above.
Subect: science (not sure if this means pyhsics or chemistry)
Answer:
All of the above
Explanation:
hope it helps you
Which is NOT a negative consequence of clearing land during deforestation? PLEASE
many answers to this question so chose whatever you link:
- urbanisation -> more people, humanity keeps on living, more job opportunities etc
- source of income for farmers
- source for food (farming)
- source for trees (eg, to create wood (houses), or to use logs for fire)
the process by of cell division in which one parent cell produces two identical daughter cells is
Answer:
Mitosis
Explanation:
Mitosis is a process of nuclear division in eukaryotic cells that occurs when a parent cell divides to produce two identical daughter cells. During cell division, mitosis refers specifically to the separation of the duplicated genetic material carried in the nucleus.
Mechanical energy is the sum of
energy and potential energy.
Answer:
True, the total amount of mechanical energy is merely the sum of the potential energy and the kinetic energy. This sum is simply referred to as the total mechanical energy.
Explanation: Hope it helps you:))))
have a good day
Four identical point charges (+4.0 µC) are placed at the corners of a square which has 20- cm sides. How much work is required to assemble this charge arrangement starting with each of the charges a very large distance from any of the other charges?
The work required to assemble this charge arrangement starting with each of the charges as very large distance from any of the other charges is +1.9 J.
Work doneThe work required to assemble this charge arrangement starting with each of the charges as very large distance from any of the other charges is calculated as follows;
W = qV
where;
V is the potential energyq is the charge[tex]W = q (\frac{kq}{r} )[/tex]
where;
r is the distance of separation of the chargesDistance between two diagonal of a square = r√2[tex]W = q (\frac{kq}{r} + \frac{kq}{r\sqrt{2} } + \frac{kq}{r} )\\\\W = \frac{kq^2}{r} ( 2 + \frac{1}{\sqrt{2} } )\\\\W = \frac{(9\times 10^9 \times (4\times 10^{-6})^2}{0.2} ( 2.707)\\\\W = 1.9 \ J[/tex]
Thus, the work required to assemble this charge arrangement starting with each of the charges as very large distance from any of the other charges is +1.9 J.
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What is measurement???
knahi pani nepali ca jasto chaxenw
Explanation:
The comparison of an unknown physical quantity with the known standard quantity is called measurement....
Here are some tho.....
HELP THIS LAST DAY!!!
Answer:
The proton has much greater mass
Explanation:
Protons and electrons are part of an atomProton exists inside nucleus whereas electron keep moving around the nucleusElectrons have negative charge where as protons have positive charge .Answer:
D, a proton has a much greater mass.
Explanation:
An electron has a mass close to nothing.
An experiment was carried out by a student to determine the strength of an electric field. He observed the interactions between two oppositely charged objects and recorded his findings as follows: I. As the distance between charged objects increases, the electric force between them decreases. II. As the amount of charge on either object increases, the electric force between them increases. III. Oppositely charged objects will attract each other. Which of the above statements about the forces between charged objects is/are true?
All the statements are correct for the strength of electric field.
What factor affect the Electric Field ?The amount of charge on the source and the distances from the source charge both affect how strong the electric field is.
All the statements are true as
The electric force varies directly with charge therefore , statement 2 is correct
The electric force varies indirectly with the distance between the electric field , Therefore statement 1 is correct.
It is known that Oppositely charged objects will attract each other , Statement 3 is correct.
Therefore all the statements are correct for the strength of electric field.
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Why we need to remove seeds from cotton balls?
Answer:
Hope this helps!
Explanation:
The seeds are removed for two reasons:
- You cannot spin cotton into a yarn if there are seeds still in the cotton.
- The seeds are a very valuable component of cotton and have a variety of uses.
Scientists can help us understand the impact of human activities on the environment. True or false?
Answer:
True
Explanation:
hope it will help you
Why is the contribution of the wavelets lying on the back of secondary wave front zero?
Answer:
The contribution of the wavelets lying on the back of the wave front is zero because of something known as the Obliquity Factor. It is assumed that the amplitude of the secondary wavelets is not independent of the direction of propagation, Sources: byju's.com
According to the Voigt and Kirchhoff's law for wavelets, the contribution of a wavelet in any direction making an angle x with the normal to the wavelet is proportional to {1+cos(x)/2)}
For wavelet lying on the back of secondary wavefront,
x = 180°→ So, the proportional factor:
→ {1+cos(180°)/2}
→ (1-1/2)
→ (0/2)
→ 0
That's why the contribution of the wavelets lying on the back of secondary wave front is zero
URGENT!!! sorry this is my first time using brainly! but here is my question: Two ropes are attached to a wagon, one horizontal to the west with a tension force of 30 N, and the other east and at an angle of 30° northward and a tension force of 40 N. Find the components of the net force on the cart. Show all your work. Thank you in advance!
The components of the net force on the cart is determined as 67.66 N.
Component of net force on the cart
The component of net force on the cart is determined by resolving the forces into x and y -components.
T1 = 30 N
T2 = 40 N
T1x = -30cos(0) = 30 N
T1y = 30sin(0) = 0
T2x = 40 x cos(30) = 34.64 N
T2y = 40 x sin(3) = 20 N
∑X = 30 N + 34.64 N = 64.64 N
∑Y = 0 + 20 N = 20 N
Resultant forceR = √(64.64² + 20²)
R = 67.66 N
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Which trait would most likely lead a scientist to investigate a blood-thinning agent in the saliva of vampire bats?
What will most likely lead a scientist to investigate a blood-thinning agent in the saliva of vampire bats is curiosity.
What is curiosity?Curiosity is defined as an inquisitive trait which is one of the qualities of a good scientist which drives them to discover more in their field.
For a scientist to investigate a blood-thinning agent in the saliva of vampire bats would have been driven by curiosity to do so.
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Why do some people still believe that Earth is flat if it's disproven?
Answer:
some people failed to realize that the earth is round ligit
Explanation: they failed to do that because of how our eyes see the earth so they was like okay it is flat caused the never saw a person that showed it on the internet
Ethanol has a specific latent heat of evaporation of 855kJ/kg. Calculate
the energy required to boil 0.60kg of ethanol.
From the calculation , we can see that the specific heat capacity is 513 kJ
What is the specific heat capacity?The specific heat capacity is the heat that can be able to raise the temperature of 1 Kg of a material by 1K.
Now;
We know that;
Latent heat of evaporation = 855kJ/kg
Mass of the liquid = 0.60kg
H = mL
H = 0.60kg * 855kJ/kg
H = 513 kJ
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a man has a mass of 85kg what is his weight
Answer:
See below
Explanation:
F = ma
= 85 * 9.8 = 833 N
OR this could be written as 187.4 pounds
OR 187 kg-weight (not just kg)
85 kg is a measure of MASS, but is often (though improperly) used as weight on earth.
A doctor has a patient blow on one side of a U-shaped tube that is partially
filled with water and has a ball floating on the other side, as shown in the
image below. If the ball rises with a force of 200 N, what pressure did the
patient apply to his side of the tube?
Answer: 100,000 Pa
Explanation:
[tex]$$Applied Force $=200 \mathrm{~N}$ \\Area $=0.002 \mathrm{~m}^{2}$\\\\Pressure $=\frac{\text { Force }}{\text { Area }}$\\$=\frac{200}{0.002}$\\$=\frac{200}{2 \times 10^{-3}}$\\$=100,000 \mathrm{~Pa}$[/tex]
Which statement accurately describes how voltage and electrical power are related?
Voltage is always twice the amount of power. This is statement is accurately describe the relationship between voltage and electric power.
What is Power?
Power is defined as amount of energy transferred or converted per unit time.
From power-current relation
P=VI
Also, From Ohm's Law we know that,
V= IR
Replacing the value of V in the above equation,
[tex]P =\frac{I^{2} }{R}[/tex]
When the values for current and resistance are given then the equation is,
[tex]P =\frac{V^{2} }{R}[/tex]
Hence , Voltage is twice to the electric Power.
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8. Ella wants to replace old bulbs of her home with new LED bulbs. She buys LED bulb that has inbuilt AC to DC converter of output 5V and 2.5A. a. If the LED is 75% efficient, what would be the power dissipated? b. Find the work done by the LED when it is connected to the power supply and left for 1hour 15 minutes.
The power dissipated by the LED is 20 Watts and the work done for 1 hour 15 minutes is 56.25 kJ.
What is electrical power?Electrical power is the rate at which electrical work is done.
Electrical power = voltage × currentThe LED is 75% efficient means that 75% of power dissipated by the LED is converted to light.
Total power dissipated = 5 × 2.5 = 12.5 Watts
Work done = power × time (in seconds)Work done = 12.5 × (1 × 3600 + 15 × 60)
Work done = 56250 J = 56.25 kJ
Therefore, the power dissipated by the LED is 20 Watts and the work done for 1 hour 15 minutes is 56.25 kJ.
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This country and the chairs they experience after their independence was , in part due to lack of experience in democratic self -government
I WILL MARK BRAINLIEST IF ANSWER CORRECTLY
NO LINKS
Congo/Zaire region is the country which experienced chaos after their independence due to lack of experience in democratic self-government.
What is Democracy?
This type of government involves the people making legislative decisions and choosing those who will rule and represent them.
Congo/Zaire region was not self sufficient and were inexperienced in democratic self-government after independence which led to political crisis.
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At what height from the surface of earth will the value of 'g' reduced to 64% from the value at the surface? Radius of earth = 6400 Km
Answer: 1600 km from the surface
Explanation:
[tex]E = \frac{GM}{R^{2} }\\g1 = \frac{GM}{R1^{2} } \\R1 = 6400 km\\g2 = 0.64g1\\\frac{g1}{g2} = \frac{\frac{GM}{R1^{2} } }{\frac{GM}{R2^{2} } } \\\frac{g1}{0.64g1} = \frac{R2^{2}}{R1^{2} }\\\frac{1}{0.64} = \frac{R2^{2}}{6400^{2} }\\\\\frac{1}{0.8} = \frac{R2}{6400}\\\\R2 = \frac{6400}{0.8}\\R2 = 8000 km\\[/tex]
Therefore, 8000 km - 6400 km = 1600 km from the surface
Which process produce x-ray?
Answer:
X-rays are commonly produced in X-ray tubes by accelerating electrons through a potential difference (a voltage drop) and directing them onto a target material
The object was thrown vertically upwards at a speed of 30 m / s. How high does the body go?
and how long does it take to get back to the point of shooting?
Answer:
4.9
Explanation:
Velocity half second before maximum height = Velocity half second after maximum height (Return journey)
For downward journey :
Initial velocity u=0 m/s
We have g=9.8 m/s
Time t= ½s
s
Thus velocity after half second v=u+gt
v=0+9.8× ½ =4.9m/s
A projectile is launched with an initial speed of 60.0 m / s at an angle of 30.0 ° Problem 17 / Pg 76 above the horizontal . The projectile lands on a hillside 4.00 s later . Neglect air friction . ( a ) What is the projectile's velocity at the highest point of its trajectory ? ( b ) What is the straight - line distance from where the projectile was launched to where it hits its target ?
(a) The projectile's velocity at the highest point of its trajectory is 51.96 m/s.
(b) The maximum height reached by the projectile is 45.92 m.
Projectile velocity at the highest point of trajectory
At the highest point of trajectory the vertical component of the velocity will be zero will the horizontal component will remain constant.
Vxi = Vxf = Vcosθ = 60 x cos30 = 51.96 m/s
Maximum height of the projectileThe maximum height reached by the projectile is calculated as follows;
H = u²sin²θ/2g
H = (60² x (sin30)²)/(2 x 9.8)
H = 45.92 m
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A car moving south speeds up from 10m/s to 40m/s in 15 seconds what is the cars acceleration
• 2m/s
• 15m/s
• 30m/s
• 50m/s
The acceleration of the car will be 2m/s².Option A is correct. According to Newton's second law, the eventual effect of all forces applied to a body is its acceleration.
What is acceleration?The rate of change of velocity with respect to time is known as acceleration.
Given data;
Initial velocity,u=10m/s
Final velocity,v=40m/s
Time elapsed,t=15 seconds
To find ;
Acceleration, a
The acceleration when the change in the velocity is observed by the formula as:
[tex]\rm a= \frac{v-u}{t}[/tex]
Substitute the given values:
[tex]\rm a= \frac{40-10}{15} \\\\ a=\frac{30}{15} \\\\ a=2 \ m/s^2[/tex]
The car's acceleration will be 2 m/s².
Hence, option A is correct.
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One problem with digital data is that it can be vulnerable to hackers.
What is a hacker?
O A. A program that changes analog data into stored digital data
O B. A person who modifies stored digital data so that it is
copied perfectly
O c. A person who gains unauthorized access to digital data
O D. A program that protects stored digital data from computer
viruses
One problem with digital data is that it can be vulnerable to hackers. A Hacker is a person who gains unauthorized access to digital data. Thus, Option C is the correct answer.
What is a Hacker?The word Hacker usually refers to a person who will uses computer to access individually to overcome the technical issues. Not only technical problem some person also use the computer to involve in the unauthorized data for the process of criminal behaviors.
They will make the data or information to get deleted and also steal or change the data in an unauthorized way.
Thus, if there was a problem with digital data is that it can be vulnerable then a person who gains unauthorized access to digital data is known as Hacker.
So, Option C is the correct answer.
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Answer:
O C. A person who gains unauthorized access to digital data
Explanation:
edward travels 150 kilometers due west and then 200 kilometers in a direction 60 degrees north of west.what is his displacement in the westerly direction?
The displacement of Edward in the westerly direction is determined as 338.32 km.
What is displacement of Edward?The displacement of Edward can be determined from different methods of vector addition. The method applied here is triangular method.
The angle between the 200 km north west and 150 km west = 60 + 90 = 150⁰
The displacement is the side of the triangle facing 150⁰ = R
R² = a² + b² - 2abcosR
R² = 150² + 200² - (2x 150 x 200)xcos(150)
R² = 62,500 - (-51,961.52)
R² = 114,461.52
R = 338.32 km
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A person is hauling their taco stand and it takes 3,500 Joules of work to stop the taco stand. What force was exerted on the taco stand if it took 1.5 meters to stop the motion?
Given the work done, the force exerted on the taco stand through the given distance is 2.3 × 10³ Newtons.
What is Work done?Work done is simply defined as the energy transfer that takes place when an object is either pushed or pulled over a certain distance by an external force. It is expressed as;
W = f × d
Where f is force applied and d is distance travelled.
Given that;
Work done W = 3500J = 3500kgm²/s²Distance covered d = 1.5mForce applied F = ?W = f × d
3500kgm²/s² = f × 1.5m
f = 3500kgm²/s² ÷ 1.5m
f = 2.3 × 10³ kgm/s²
f = 2.3 × 10³ N
Given the work done, the force exerted on the taco stand through the given distance is 2.3 × 10³ Newtons.
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The diagram above shows a metal disk of weight 1.0 N resting on an index card that is balanced on top of a glass. What is the normal force acting on the metal disk?
If the weight of the metal disk is 1.0 N, the normal force acting on the metal disk is also 1.0 N but acting in the opposite direction.
What is the normal force?According to Newton Law, action and reaction are equal and opposite. The reaction force is equal in magnitude to the weight of an object but opposite in direction.
Having said that, if the weight of the metal disk is 1.0 N, the normal force acting on the metal disk is also 1.0 N but acting in the opposite direction.
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