The reason we can read print from any direction is that
A. letters emit black light in all directions
B. letters absorb black light from all directions
C. the white part of a page reflects light in all directions
D. All of the above
E. None of the above
Answers
The answer is B and C are both true.
The reason we can read print from any direction is that the white part of a page reflects light in all directions. Hence, option C is correct.
What is reflection?Reflection is an optical phenomenon, that the light when hit on a transparent object reverts back in the straight direction making the material surface gleaming.
White light is the mixture of all the visible lights. White material absorbs all colors and all of them are reflected back making its color white. Whereas, black light is not reflecting any color but absorbs all. Thus, no reflection causes no color except the darkness.
Letters in white background is visible in all direction since white light reflects in all directions. Thus, black letters printed in in a white page will be readable in all directions.
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Related Questions
Four radioactive 10-gram (g) samples with their remaining isotope mass are listed in the table that spans 50 years.
Which isotope would be expected to have the longest half-life?
PLEASE GIVE ME THE CORRECT ANSWER (THANK YOU IN ADVANCE.) no links please, Just the answer.
A.
Silver-108
B.
Mercury-194
C.
Californium-249
D.
Americium-241
10 years 9.84 g 9.80 g 9.84 g 9.85 g
20 years 9.68 g 9.61 g 9.67 g 9.69 g
30 years 9.53 g 9.42 g 9.51 g 9.54 g
40 years 9.38 g 9.24 g 9.36 g 9.39 g
50 years 9.23 g 9.06 g 9.20 g 9.25 g
Answers
Americium-241 isotope would be expected to have the longest half-life. Hence, option (D) is correct.
What is half-life?
In radioactivity, the half-life is the time required for one-half of a radioactive sample's atomic nuclei to decay (change spontaneously into other nuclear species by emitting particles and energy), or, equivalently, the time required for the number of disintegrations per second of a radioactive material to decrease by one-half.
According to given data:
Rate of decay is the highest for Mercury-194, hence, its half-life is least. Then rate of decay is lowest for Americium-241, hence, its half-life is the longest. Hence, option (D) is correct.
The order of half-life according to the data is:
Americium-241 > Silver-108 > Californium-249 > Mercury-194.
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Please help me I need it ASAP! PLEASE!!
Recall that kinetic energy is the energy of motion. Use the information provided for each soccer ball in the image below to calculate the kinetic energy of each soccer ball (Round to the nearest hundredth). Use K.E. = 1/2 m v2 to got your answer.
Answers
Answer:
kinetic energy is the answer
The half-life of sodium-24 is 15 minutes. What was the original mass of Na-24 if 5.0 g remains after 1 hour?
20 g
40g
80g
100g
Answers
40g remains after an hour.
answer
40g
What are some ways to block fear from back tumbling?
Answers
Answer:
to trust your yourself and fundamentals! It's all mental just need a little more confidence.
Explanation:
You got this!
Explain the importance of mindfulness and how meditation can help with being more mindful daily.
Answers
What are the formulas for Newton's 1,2,3 laws of motion?
How did he come up with the idea of his book?
Answers
Newton's three laws of motion can be summarized by the following formulas:
Law of Inertia, Newton's 1st Law of motion:
F = 0, or F = ma if there is an acceleration.
This means that if an object is at rest, it will remain at rest unless acted upon by an external force. Similarly, if an object is in motion, it will continue to move in a straight line at a constant speed unless acted upon by an external force.
Newton's second law of motion:
F = ma
This formula states that the acceleration of an object is directly proportional to the net force applied to the object and inversely proportional to its mass. In other words, the greater the force applied to an object, the greater its acceleration will be. Similarly, the greater the mass of an object, the smaller its acceleration will be for a given force.
Newton's third law of motion:
FAB = -FBA
This formula states that for every action, there is an equal and opposite reaction. In other words, when one object exerts a force on another object, the second object exerts an equal and opposite force back on the first object.
Isaac Newton's most famous book, "Philosophiæ Naturalis Principia Mathematica" (often called "the Principia"), was based on his own research and discoveries in mathematics and physics. The idea for the book came from his desire to develop a comprehensive system for explaining the workings of the natural world based on mathematical principles. He began working on the book in the 1660s, and it was first published in 1687.
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Inertia, Acceleration, Action & Reaction
(you can just say a color)
Answers
Answer:
I think its red
Explanation:
divide the distance 8000 by the hours 10 to get 800
Answer:
Red.
Explanation:
If you divide the distance by the time, you will discover that the airplane traveled 800 miles per hour.
Pls mark Brainliest with the crown.
Which of the following forces has not changed Earth's surface?
folding
erosion
weathering
gravity
Answers
Answer:Gravity is the force among the options listed that has not directly changed Earth's surface.
Explanation:
Gravity is a fundamental force that acts on all objects with mass, including the Earth itself, but it does not cause changes or modifications to the Earth's surface features. Instead, gravity influences the movement of materials and the shape of the Earth's surface by exerting a pulling force on objects. On the other hand, folding, erosion, and weathering are all processes that directly contribute to shaping
25 POINTS! Q1) A cinder block is pulled 0.50 meters to the right in 3 seconds. What is the block's average speed to the nearest hundredth of a meter per second (m/s)?
Q2) A skateboarder starts at the top of a halfpipe ramp, skates through the middle, and up the other side. Match the following to describe what is happening at each of the three points in the skater's movement.
Middle
End
Beginning
1.
Maximum kinetic energy
2.
Potential and kinetic energy is equal
3.
Maximum potential energy
Answers
The average speed of the blocks are 0.36 m/S.
Explanation:
Average speed is defined as the ratio of distance covered per unit time. So if it is said that blocks are pulled to 0.9 m in the right side. This means the blocks cover a distance of 0.9 m from the origin and that distance is covered in 2.5 s. Thus, the average speed can be calculated from the change in speed
with respect to time. As at time t = 0, the speed is
also zero, and at time t = 2.5 s, the speed will be
Speed =
0.9 = 0.36
2.5
Since, in this case, the speed is equal to the average speed of blocks. So the average speed of the blocks will be 0.36 m/s.
1.maximum kinetic energy minimum GPE
2.GPE is equal to kinetic energy
3 this time there will be maximum GPE
Discuss one component of your school's recycling system that could be automated and predict the economic impact.
Answers
One component of my school's recycling system that could be automated is the sorting of recyclables. Currently, the school relies on students and staff to sort recyclables into the appropriate bins, which can be time-consuming and may result in contamination if materials are not sorted properly.
Automating the sorting process with a machine or conveyor belt system could improve the efficiency and accuracy of the recycling system. It could also potentially reduce labor costs associated with manual sorting.
The economic impact of automating the sorting process would depend on the initial cost of the equipment and any associated installation or maintenance costs. However, over time, the improved efficiency and accuracy of the system could result in cost savings for the school. Additionally, the increased efficiency of the system could potentially lead to increased recycling rates, which could result in cost savings for waste disposal and potentially generate revenue through the sale of recycled materials.
Answer:
Our school has color coded virtual trash cans. For example, a trash can for only paper will only accept paper items, if the item put inside is not paper, it will litter it out and all students have cleaning duties throughout the week so even if you or someone litters you’ll probably have to clean it up at some point anyways. I honestly think it’s very cool. (i wish this was true smh).
If two forces act on an object in the same direction, the net
force is equal to the
of the two forces.
Answers
Answer:
yes, the net force is equally two forces sorry I am just try this question about
Explanation:
l don't knowAnswer:
sum
Explanation:
If two forces act on an object in the same direction, the net force is equal to the sum of the two forces.
Types of crust found at certain tectonic boundaries (earths layers)
Pls answer I need to finish this assignment
Answers
Answer:
The Earth’s lithosphere, which includes the crust and upper mantle, is made up of a series of pieces, or tectonic plates, that move slowly over time.
HELP ME PLEASE!!!!!! A table showing variety among some young people.
Answers
Answer:
sorry please put a example of what you wanted help on.hold did u want to know eye color hair color. then please add a example of the the type of chart.Compare and contrast model A with model C. How are they alike: How are they different? A) They are composed of different elements in the same ratio. B) They are composed of the same elements in different ratios. C) They are composed of different elements in different ratios. D) The are composed of the same elements but the bond types differ.
I NEED HELP FAST!!!!
Answers
Model A and B are composed of the same elements in different ratios.
Models are representations of molecules. Models presented in three dimensions are helpful aids in visualizing what a molecule looks like and thereby developing some insights into its properties.
Looking at the models for A and C, we can see that both A and C are composed of oxygen and nitrogen but in different ratios. The ratio in A is 1:1 while the ratio is C is 2:1.
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True or False this is a black hole 75 points + Brainliests
Answers
Answer:
true
Explanation:
lol idek tbh
Answer: true?
thx for the points anyway
Explanation:
Which of the following scientists introduced the concept of absolute zero?
A.lord kelvin
B.edwin Hubble
C.jonhannes kelper
D. Albert Einstein
Answers
Answer:
A. lord kelvin
Explanation:
In 1848, Kelvin used this as a basis for an absolute temperature scale. He defined "absolute" as the temperature at which molecules would stop moving, or "infinite cold." From absolute zero, he used the same unit as Celsius to determine the increments.
Absolute zero cannot technically be achieved. However, scientists have been able to lower the temperature of matter to just a fraction of a Kelvin above absolute zero through techniques such slowing down particles using lasers.
Speed is different from velocity because
a. velocity has a direction
b. speed uses distance/time
c. velocity does not include time
d. velocity does not include distance
Answers
Answer:
A. velocity has a direction .. .
with magnitude too but speed has only magnitude
Answer:
A
Explanation:
Speed doesnt have a direction, it is a type of measurement while velocity is the rate and direction that something is going
A group of students is tasked with developing a checklist for determining whether a material undergoes a chemical or physical change. The students make a preliminary list of properties that they can test and classify each as either a chemical or physical property.
Chemical Property Physical Property
bubbles when treated with acid color
burns when placed in a candle flame odor
density hardness
boiling point mass
dissolves in water melting point
Several other students in the class claim that the checklist is incorrect.
What change should the group make to the checklist to correct their mistake?
Boiling point and density should be moved to the physical property side of the list, and color and odor should be moved to the chemical property side of the list.
Boiling point and density should be moved to the physical property side of the list, and hardness and mass should be moved to the chemical property side of the list.
Dissolves in water and boiling point should be moved to the physical property side of the list, and odor and mass should be moved to the chemical property side of the list.
Density and boiling point should be moved to the physical property side of the list.
please help
Answers
Answer:
that's alot better explain it
What does the amplitude of a light wave determine?
Answers
Hope this helps :)
A student is taking an animal science and an astronomy class. In animal sciences, she learns that pumas are called mountain lions and cougars in different parts of the world, but they are all the same cat. She makes an analogy, or comparison, to something she learned in her astronomy class. She says that a certain space object is like a puma because it is the same object but has different names depending on where it is. What space object is she thinking of?
comet
meteoroid
asteroid
meteoride
Answers
Answer: meteoroid
Explanation: a meteoroid becomes a meteor when it enters earths atmosphere
Answer:
meteoroid
Explanation:
Is this right?
Meryl is making a collage of pictures for her science class. On one-half of a piece of poster board, she is attaching pictures of the result of adding heat to materials. On the other side of the poster, she is attaching pictures of the result for removing heat from materials. Which of the following pictures should be placed on the side of heat being removed from the material?
a frozen popsicle
baked cupcakes
steam from a pot
melted candy bar
Answers
Answer: It's kind of a subjective question by saying Which of the following pictures should be placed on the side of heat being removed from the material?
Explanation: I'm not entirely sure about this but I would think that it would be baked cupcakes because they had to undergo heat to become "baked", so they are the result of heat.
is it possible to breed a black haired long tailed retriever? If so, what percentage is possible? PLEASE answer the corrects answers pleaseeeeeeeee if u do i will give u extra points this is science btw
Answers
Answer: it can be considered a genetic mutation with a history of a Golden Retriever in their blood but it is very rare. and there our some black retrievers you can buy too. i hope i helped
Explanation:
Unless otherwise stated, all objects are located near the Earth's surface, where g = 9.80 m/s2. An Olympic skier coasts down a slope with an angle of inclination of 44 ∘. What is the acceleration of the skier?
Answers
Answer: write it out in number form. It should ge easier from there
The acceleration of the skier will be 6.8 m/s².
The following information can be gotten from the question:
Angle of inclination = 44°.Acceleration due to gravity = 9.80 m/s²Therefore, the acceleration of the skier will be:
= g × sinθ
= 9.8 × sin44°
= 6.8 m/s²
Therefore, the acceleration of the skier will be 6.8 m/s².
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3 ways how natural disasters impact environment.
Answers
2. Storm surges cause beaches to shift and alter shape.
3. During flash floods, riverbanks erode.
1.Buildings collapse
2.toxic gases release into the environment
3.disease
(1.) Consider the equation: 4Fe + 3O2 yields 2Fe2O3
- What is the theoretical yield of Fe2O3 when 12.0g of iron rusts?
- If 14.21 g of Iron (III) oxide is actually produced what is the percent yield ?
(2.) what is the molarity of a 126.81 L solution that contains 5.1 moles of KCl ?
Answers
1a. The theoretical yield of Fe₂O₃ obtained is 17.14 g
1b. The percentage yield of Fe₂O₃ obtained is 82.9%
2. The molarity of the KCl solution is 0.04 M
1a. How to determine the theoretical yield of Fe₂O₃Balanced equation
4Fe + 3O₂ —> 2Fe₂O₃
Molar mass of Fe = 56 g/mol
Mass of Fe from the balanced equation = 4 × 56 = 224 g
Molar mass of Fe₂O₃ = (56×2) + (16×3) = 160 g/mol
Mass of Fe₂O₃ from the balanced equation = 2 × 160 = 320 g
SUMMARY
From the balanced equation above,
224 g of Fe reacted to produce 320 g of Fe₂O₃
Therefore,
12 g of Fe will react to produce = (12 × 320) / 224 = 17.14 g of Fe₂O₃
Thus, the theoretical yield of Fe₂O₃ is 17.14 g
1b. How to determine the percentage yield Actual yield of Fe₂O₃ = 14.21 gTheoretical yield of Fe₂O₃ = 17.14 gPercentage yield of Fe₂O₃ =?Percentage yield = (Actual / Theoretical) × 100
Percentage yield of Fe₂O₃ = (14.21 / 17.14) ×100
Percentage yield of Fe₂O₃ = 82.9%
2. How to determine the molarity of the KCl solutionMole of KCl = 5.1 molesVolume = 126.81 LMolarity of KCl =?Molarity = mole / volume
Molarity of KCl = 5.1 / 126.81
Molarity of KCl = 0.04 M
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a toy airplane is flying at a speed of 8 m/s with an acceleration of 0.9 m/s^2. How fast is it flying after 2 seconds? A)9.8 m/s B)8.1 m/s C)5.2 m/s D)3.6 m/s
Answers
Answer:
A) 9.8m/s this answer is correct.
The acceleration is increasing by 0.9m/s^2 .
so, in each second it will increase by 0.9m/s^2.
Therefore, in 2 second
0.9 * 2
= 1.8m/s
Now,
8 + 1.8
= 9.8m/s
What two gases in the atmosphere do animals and plants need to breathe and grow?
Answers
Answer: Explanation:
Plants and animals each produce the gases that the other needs to live. Plants need carbon dioxide—people and other animals exhale carbon dioxide as a waste product. People and other animals need oxygen—plants produce oxygen during an important process called photosynthesis, which turns the sun's energy into nutrients.
How could you contract HIV through a cut on your finger
Answers
Essentially you can get it by someone else’s blood going into yours through the cut.
A meteor falls toward Earth's surface. Given that the acceleration due to
gravity is 9.8 m/s^2, what is the meteor's potential energy if it has a mass of 10
kg at an altitude of 400 m?
O A. 408 J
O B. 7,840,000 J
O C. 2J
O D. 39,200 J
Answers
Answer:
39,200J
Explanation:
just took the test
The meteor's potential energy if it has a mass of 10kg at an altitude of 400 m will be 39200 J
What is potential energy ?Potential Energy that depend upon the relative position of various parts of system . It is an energy possessed by an object by virtue of its position or configuration.
mass(m) = 10kg
g (acceleration due to gravity) = 9.8m/s^2
altitude(height (h)) = 400m
Meteor's Potential energy = m * g * h
= 10 * 9.8 * 400 = 39200 J
correct option will be a) 39200 J
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PLS HELP QUICK!!!!!!!!
