You have to cast the shadow of your pencil on the wall with the
help of candles in a dark room. How can you obtain the shadow of
same size, small size and big size of the same pencil?
Answer:
Shadows are formed when an opaque object comes in the path of light. Opaque objects do not allow light to pass through them.
Explanation:
I hope this helps
What is the charge on the Cr in Cr2O72-
Answer:
+6.
Explanation:
So, a chromium atom here has an oxidation number of +6.
I know this is a lot but I need help on just a few thanks!
Robert is thinking about buying a new refrigerator. His old refrigerator runs at about 43% efficiency. Which most likely accounts for the remaining 57% of the energy?
A: It is used up by the light in the refrigerator.
B: It is released to the surroundings as heat
C: It is converted into mechanical energy.
D: It stored as a form of potential energy.
Answer:
D it stores as a firm of potential energy
Describe the continental crust. NO LINKS NO FAKE ANSWERS I NEED THIS ASAP
Answer:The continental crust is the outermost layer of earths atmosphere that makes the plate continents and continental shelves.
Explanation:
An element that is a silver-colored liquid is?
a hydrogen
b mercury
c silver
d carbon
Answer:
mercury
Explanation:
silver in color, and you can find in on the periodic table
Can you help me please
Answer:
D
Explanation:
DDDDD
When we rewrite the given in a simpler unit we have 7.9 ms-1.
What is dimensional analysis of formulas?By looking at the units of the quantities involved, dimensional analysis is a technique for determining whether a physical equation or formula is right. The essential tenet of dimensional analysis is that the quantities being multiplied or divided in the equation must have units that are equal to the units of the final result.
We know that we have to apply the principles that apply to dimensional analysis in the question and we have that;
m^2.s/m.s^2
= ms-1
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How does the water in an estuary compare to the water in the open ocean?
Estuaries have less concentrated nutrients and salt.
Estuaries have more concentrated nutrients and salt.
Estuaries have less concentrated nutrients and more concentrated salt.
Estuaries have more concentrated nutrients and less concentrated salt.
Answer:
Estuaries have more concentrated nutrients and less concentrated salt.
Explain how thermal Energy, Temperature and kinetic energy are related in a substance.
Explanation:
When the temperature of an object increases, the average kinetic energy of its particles increases. When the average kinetic energy of its particles increases, the object's thermal energy increases. Therefore, the thermal energy of an object increases as its temperature increases.
(Science)
pls help, due today in 2 hours and have alot more to do
You push a sofa, but you can't get it to move by yourself. Why?
A. You have more inertia than the sofa.
B. There is no inertia because the sofa is not moving.
C. Your force is stronger than the friction between the sofa and the floor.
D. The sofa's inertia is greater then your applied force.
Answer:
D.The sofa's inertia is greater then your applied force.
What do we call the principal SI units that are used to derive all other SI units? derived units derived units base units base units lowest units lowest units fundamental units
Answer:
the answer is derived physical measurements
what is the function of the two microscope lenses?
1. Using D10W and a vial of NaCl 4 mEq/mL, how many mL of NaCl are needed to prepare 250 mL of a
D10/NS solution?
a. 4.8mL
b. 9.6ml
c. 19.6mL
d. 154mL
To prepare 250 mL of a D10/NS solution using D10W and a vial of NaCl 4 mEq/mL, you would need 9.6 mL of NaCl. Normal saline (NS) contains 154 mEq/L of sodium chloride (NaCl). To prepare 250 mL of NS, you would need 250 mL * (154 mEq/L) = 38500 mEq of NaCl. Since the vial of NaCl contains 4 mEq/mL, you would need 38500 mEq / (4 mEq/mL) = 9625 mL = 9.6 mL of NaCl. So the correct answer is b. 9.6ml.
Describe how the Rube Goldberg device design that you created follows the law of conservation of energy. Be sure to include both parts of the law of conservation of energy in your description.
On the diagram below, circle the position of the where the southern hemisphere is experiencing spring. Justify your answer
Answer: D
Explanation:
The sun shines the sputhern hemisphere fully on the top= summer
the sun shines somewhat towards the Southern Hemisphere but itfaces away= fall
sun doesnt show at the bottom= winter
faces it more than example b= D
Simple and complex molecules are similar in that they both involve ____ atoms A water B simple C bonded D complex
Answer:
The answer is C.
Explanation:
Please give brainliest
Answer:
D
Explanation:
complex, in chemistry, a substance, either an ion or an electrically neutral molecule, formed by the union of simpler substances (as compounds or ions) and held together by forces that are chemical (i.e., dependent on specific properties of particular atomic structures) rather than physical.
HELP RTIGHT NOWWWWWWWWWWWWWWWWW
Explanation:
biosphere
that is the answer
Answer:
biosphere
I hope it help
(1.) If at 100.0 mL solution contains 0.850 moles of a solute, what is the molarity ?
(2.) If the molarity of a solution is 12 M and the volume of the solution is 1.0 L, how many moles of solute does the solution contain ?
Answer:
See below
Explanation:
1) Moles / volume
.85 mole / .1 liter = 8.5 M
2) 12 moles are contained in one liter
Choose the best answer to each question. Which has the most kinetic energy?
Answer:
A, B, and B on edge
Explanation:
Among all the given options, the correct option is option A. A bowling ball with a velocity of 1.5 m/s.
What is kinetic energy?Kinetic energy is a type of power that a moving object or particle possesses. An item accumulates kinetic energy when work, which involves the transfer of energy, is performed on it by exerting a net force.
A moving object and particle has kinetic energy, which relies on both its mass and its rate of motion. The type of motion might be vibration, rotation on an axis, translation (or travel across a path from one point to another), or indeed any combination of these. A bowling ball with a velocity of 1.5 m/s.
Therefore, the correct option is option A that is A bowling ball with a velocity of 1.5 m/s.
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a six word story of evolutions. (six words not six letters)
Compare the Engineering Design Process and the Scientific Method! Give 6 Similarities and 6 differences for each one! Be creative in how you compare them!
In the following images, a blue circle represents an atom of one type of element, and a red square represents an atom of a second type of element. Determine which of them represent a pure substance, a homogenous mixture, and a heterogeneous mixture.
Are these in the right order?
Answer: No they are not. "Pure substance" is supposed to be placed in the middle picture. "Homogenous mixture" is supposed to be placed in the right picture. "Heterogenous mixture" is supposed to be placed in the left picture.
Explanation:
Pure Substances:
There are two categories of pure substances: elements and compounds (In our case, we have a compound).
Element (e.g. the blue circles or the red squares):
An element is a fundamental substance.An element cannot become simpler than itself, even if chemical separation methods are used.Compound (e.g. the blue circles bonded together with the red squares in the middle picture):
A compound is a substance made of two or more elements in fixed proportions (i.e. One element has the same amount as the other).A compound can be made into individual elements or simpler substances using chemical methods of separation.Mixtures:
There are two categories of mixtures: homo- and hetero- genous.
Homogenous mixture:
The substances or elements are mixed to look like one single substance and cannot be told apart (e.g. When salt dissolves in water, the water still looks like water).The substances or elements are distributed evenly throughout the apparatus. The number of different types of substances or elements can vary (e.g. There is more water than salt) The substances or elements do not bond together.Heterogenous mixture:
The substances or elements are mixed and can be told apart (e.g. When oil is mixed with water, the oil is "water-hating" so it forms its own layer on the bottom, while the water forms another layer on top of the oil layer).The substances or elements are distributed where one type of substance or element is bunched up in one spot and another substance or element in another spot.The number of different types of substances or elements can vary.The substances or elements do not bond togetherThe second Image is not a homogenous mixture, it is a heterogenous mixture as two different types of elements are mixed together.
The mix of two different types of elements in the heterogenous mixture is not uniform and has uneven mixed types.
The third image is a homogenous mixture as even though two different types of elements are together, they are not mixed with each other.
Unlike in the heterogenous mixture, in a homogenous mixture, there is a uniform mix of two different types of elements.
The first image is correct, the image depicts a pure substance.
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What is an ellipse please help)
In mathematics, an ellipse is a plane curve surrounding two focal points, such that for all points on the curve, the sum of the two distances to the focal points is a constant. As such, it generalizes a circle, which is the special type of ellipse in which the two focal points are the same.
Maybe they might use that math thing for Science.
Scientists have discovered a colony of potential organisms on the Planet Moby and named them "Maxoids." Read the information below that scientists have gathered on Maxoids and decide whether Maxoids are living or nonliving things. Explain how you came to this conclusion.
Through testing and observation, scientists have recorded the following characteristics of Maxoids. Maxoids reproduce via sexual reproduction. One parent carries the Maxoid eggs for 12 weeks before they hatch. After hatching, juvenile Maxoids continue to grow for seven months. To acquire energy for growth, Maxoids consume a peculiar liquid substance native to the planet Moby. The Maxoids' cells use this energy, as well as large amounts of water, to carry out important functions. The Maxoids are sensitive to changes in internal temperature. Sometimes they dig holes and lay in them to cool down if they get too warm.
The Maxoids are living things because they possess the characteristics of living things.
What are living things?Living things are things which have life in them.
Living things are identified by the characteristics which make them living.
The characteristics of living things include:
Movement - living things are able to move all or parts of their bodyRespiration - living things are able to break down food substances to produce energyNutrition - living things are able to take in food substancesIrritability - living things are able to respond to changes around themGrowth - living things are able to increase in size and massExcretion - living things are able to remove waste substances from their bodiesReproduction - living things are able to produce new ones of their kindConsidering the Maxoids;
They are able to reproduceThey take food in the form of a liquid substanceThey are sensitive to changes in internal temperatureIn conclusion, the Maxoids are living things.
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Which of the following statements fully describes what an object may do when it experiences unbalanced forces? Select the two best answers.
A. It may change directions.
B. It will move at a constant speed.
C. It may slow down.
D. It may slow down or speed up.
E. It will stay stationary.
Answer:b
Explanation:
How to work out the relative mass of potassium? What is the calculation? ( explained very easily )
Answer:
39
Explanation:
Relative mass does not need to be calculated as it is listed on the periodic table. Potassium's relative atomic mass is around 39.
which chemical process is illustrated below?
Answer:
I believe it is D, Dehydration synthesis of amino acids to form a dipeptide
can praseodymium conduct electricity
Answer:
praseodymium can conduct electricity as it is one of it's conductivities
CO2(g) + NH3(g) + H2O(l) → NH4HCO3(s) witch type of reaction plzz within 1 hour
Waldo gets stopped by the police, and the police officer tells Waldo that she caught him on radar doing 50 miles per hour in a 40 miles per hour zone.
Waldo responds, " No way! I was traveling 50 miles per hour. I sat at home for 1 hour and then drove for 1 hour before you stopped me. I traveled 50 miles total in that second hour. So, my speed was 25 miles per hour. That's well under the speed limit."
Waldo is wrong, per speeding laws, and does receive a speeding ticket. Explain how Waldo came up with a speed of 25 miles per hour.
Answer:
He counted the first hour (The one where he was sitting at home) in his speed calculations.
The correct answer is waldo believes that while he was sitting at home, he was traveling for an hour, which he believes is due to the earth's rotation, which he wants to qualify as travel. And so after he drove 50 miles in the second hour, he realized he had driven two hours total, so he calculated that 50 miles divided by two hours equaled 25 mph.
What is the meaning of the earth's rotation?The rotation of the planet Earth around its own axis, as well as variations in the orientation of the rotation axis in space, is known as Earth's rotation or Earth's spin.The Earth revolves in a prograde direction eastward. Earth rotates counterclockwise when viewed from the north pole star Polaris.Learn more about earth's rotation here:-
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