Answer:
Explanation:
1 kg of coal releases 3 million joules of energy
energy released = 3 x 10⁶ Joules
This energy will be in the form of chemical energy .
This energy is being used ti lift 1 kg of coal . Let height attained be h .
Gravitational potential energy of coal at height h = mgh where m is mass of the coal , g is gravitational acceleration .
chemical energy = gravitational energy
mgh = 3 x 10⁶
1 x 10 x h = 3 x 10⁶
h = 3 x 10⁵ m
= 300 x 10³ m
= 300 km .
so , 1 kg coal can be lifted by 300 km .
What is the density of an object with a mass of 150.0 g and a volume of 20.0 mL
Answer:
7.5g/mL
Explanation:
Density = Mass/Volume
= 150.0g/20.0mL
= 7.5g/mL
Significant Figures in Multiplication and Division
A is 3600 m away from B. Jack spent 720.0 s running from A
to B. What is Jack's average speed? (Average speed =
Distance/Time)
Answer:
5m/s
Explanation:
3600m ÷ 720s
= 5m/s
The density of mercury is 13.5g/mL. What is the volume of this liquid if the sample weighs 12.5 pounds?
Answer : The volume of liquid is 420 mL.
Explanation :
Density : The mass per unit volume of a substance is known as density.
Formula used:
[tex]\text{Density}=\frac{\text{Mass}}{\text{Volume}}[/tex]
As we are given:
Density of mercury = 13.5 g/mL
Mass = 12.5 pounds
First we have to convert mass of sample from pound to gram.
Conversion used:
As, 1 pound = 453.6 g
So, 12.5 pounds = 453.6 × 12.5 g = 5670 g
Now we have to calculate the volume of liquid.
[tex]\text{Density}=\frac{\text{Mass}}{\text{Volume}}[/tex]
Now putting all the given values in this formula, we get:
[tex]13.5g/mL=\frac{5670g}{\text{Volume}}[/tex]
Volume = 420 mL
Therefore, the volume of liquid is 420 mL.
What is the speed of a man that travels 2 meters in 6.5 seconds?
Answer:
0.305556 m / s
Explanation:
Speed = distance / time
2 metres = 0.002 km
6.5 sec = 0.00180556 hrs
Therefore,
Speed = 0.002 / 0.00180556
= 1.1 km / hr
= 0.305556 m / s
≈ 0.31 m/s
Explanation:v = d/t
= 2m/6.5s
= 0.3079 m/s
≈ 0.31 m/s
I need help for some of the question please,
Answer:
Number 6
Explanation:
A reflex action is an involuntary action and nearly instantaneous movement in response to a stimulus.
Answer:
2. Nerves helps to send impulses or information from one place to another and it also carries sensory and motor fibres and most however are mixed nerves carrying both sensory and motor fibres.
3.The brain has many functions and the brain has different regions that deals with different functions in the body.
6.Reflex actions are automatic responses to stimuli.They do not involve the conscious (voluntary) or higher centres of the brain and so are also known as involuntary actions.
10.Loop of Henle,Bowman's Capsule, Glomerulus, Proximal Capsule.
13.Urter is part of the reproductive organ in an human being.
14.We should drink enough water and we should not store our urine,we should always empty our bowels when we feel like using the toilet.
15.Water is good for urinary system because it help for easy digestion and for easy work in the system.
12.The urine is stored in the bladder.
11.Kidneys remove nitrogenous wastes and also control the amount of water,salts and acids - the osmoregulatory function.
5.Nerves that carries the sensory fibre and nerves that carries the motor fibre.
1. Brain and the spinal cord or the central nervous system and the peripheral nervous system.
4.They carry informations from one part of the body to another and they also help in the coordination of the body.....
I think some of the answers are correct...Thank you for the questions.....
Spongebob loves to garden and wants to grow lots of pink flowers for his pal Sandy. He bought a special Flower Power fertilizer to see if it will help his
plants produce more flowers. He plants three plants of the same size in separate containers with he same amount and type of potting soll. He places one
plant in a sunny window and waters It every day with fertilized water. He places the second plant in a more shady window and waters it every other day
with fertilized water. He places the third plant in a dark closet and waters it every day with plain water. What did Spongebob do wrong in this experiment?
he has no controlled variables
he has too many dependent variables
he has no control group
he has too many Independent variables
Explanation:
he has no controlled variables
Describe 3 differences between ice, liquid water and steam.
Steam is a gas. ... The difference between a liquid and the other states of matter is that liquid molicules are more spread apart than solid molicules but less spread apart than gas molicues. Water is the base for both ice and steam.on:
The main difference between ice, liquid water, and steam is that ice is a solid, liquid water is a liquid, and steam is a gas.
What are the main difference between ice, liquid water, and steam?The first difference between ice, liquid water, and steam is that ice is solid, liquid water is liquid, and steam is gas.
The second difference between ice, liquid water, and steam is that ice is solid so the molecule of solid are closely packed and intermolecular space is negligible, liquid water is a liquid so the molecule are little far with each other and intermolecular space between molecules are more as compare to solid, and steam is gas so the molecule s are scattered freely and intermolecular space is very high as compare to solid and liquid.
The third difference between ice, liquid water, and steam is that 32°F is the freezing point of water, when temperature arises from 32°F water starts melting and converted from solid to liquid.
Therefore, the main difference between ice, liquid water, and steam is that ice is a solid, liquid water is a liquid, and steam is a gas.
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How might you measure the amount of energy in the world's largest rice cake?
Answer:
When you eat the largest rice cake in the world, you increase how many kilograms and multiply by 7,700 will get the energy of the cake.
Explanation: one kilo=7.700 calories
When a jar of coffee is opened, people in all parts of the room soon notice the smell.
plain how this happens
Answer:
Explanation:
because in air the particles are moving very fast and jar of coffee has hot particles which kinetic energy is also more so that's why it's particles move faster and gets mixed with air and smell is coming from far away
how you would improve them modern day smart phones .
Answer:
We could improve modern day smart phones by adding more storage, increasing it's speed, having more feature and changing the design of the phones to make them look more better.
Hope this helps!
Answer: They can look on the cell phone ringtone?-
Explanation:
The more mass you have of a substance:
A. the greater its thermal energy
B. the slower the motion of its particles
C. the smaller its thermal energy
D. the faster the motion of its particles
Do the following problem using significant figures
22.33 mL
+
55.666 mL +
0.001 mL
mL
Answer:
80.00 mL
Explanation:
Let's consider the following addition.
22.33 mL + 55.666 mL + 0.001 mL
22.33 mL has 4 significant figures.
55.666 mL has 5 significant figures.
0.001 mL has 1 significant figure.
For addition and subtraction, we look at the places to the decimal point. Add or subtract in the normal fashion, then round the answer to the least number of places to the decimal point of any number in the problem.
22.33 mL + 55.666 mL + 0.001 mL
77.997 mL ≈ 80.00 mL
What is the relationship between heat and the state of matter of a substance? use the graph to answer the question
Answer:
How can gas become a liquard
Explanation:
air filter
9.1 x 10−13kg is equal to how many ng.
Answer:
.91 ng
Explanation:
So for the first one the conversion factor which is the first blank in your first question is (1/100) and the second blank which would be (74)(1/100) is 0.0174
The second one would have two conversion factors where the first blank would convert to grams, so the conversion factor for the first blank is (1000/1), then converting from grams to nano grams, whose conversion factor is (1,000,000,000/1).
So in general the second one is 9.1 x 10^-13 (1000/1) x (1,000,000,000/1) = .91 ng
Hope my explanation is easy to understand.- Ryan Brown indy
9.1 x 10-¹³ kg is equal to 0.91 nanograms (ng).
CONVERT MASS IN kg TO g
Kilograms and grams are both interconvertible units of mass. The conversion ratio of kg to grams is as follows:1000 grams = 1 kilogram
Hence, 9.1 x 10-¹³ kg is equal to (9.1 x 10-¹³ × 10³)= 9.1 x 10^(-13+3)
= 9.1 × 10-¹⁰ grams.
CONVERT MASS IN g TO ng
The conversion ratio of grams to nanograms (ng) is as follows:1gram = 1000000000 (10⁹) nanograms
Hence, 9.1 × 10-¹⁰ grams = 9.1 × 10-¹⁰ × 10⁹= 9.1 × 10^(-10 + 9)
= 9.1 × 10-¹
= 0.91 nanograms (ng).
Therefore, 9.1 x 10-¹³ kg is equal to 0.91 nanograms (ng).
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Question 5 of 10
Why do scientists need governmental funding?
O A. Scientists have to pay taxes to the government on the money they
make.
B. The government is controlled by scientists.
O C. Government politicians ask all the important scientific questions.
O D. The cost of doing scientific research can be very high.
Answer:
d
................. ....
Does a basketball have positive or negative acceleration when it is thrown?
Answer:
The basketball has a constant negative acceleration due to gravity when it is thrown
Explanation:
Before the basket ball is thrown, and when the basket ball is in free fall flight it is always under and experiences an attractive force between the Earth and all objects on Earth known as gravitational force such that the direction of the acceleration of the gravitational force is always towards the Earth and therefore, downwards, resulting in an increasing decreased upward speed of the thrown ball in the projectile motion, equivalent to the ball having a negative acceleration, same as all objects in free fall.
A substance is composed of only one kind of Adam and can't be separated into simpler substances are converted into it another substance by chemical processes
Answer:
Element
Explanation:
An element is substance that is composed of only one kind of atom and can not be separated into simpler substances or converted into another substance by chemical processes.
Chemical elements are found in the periodic table. Examples of chemical elements include; sodium potassium, phosphorus, hydrogen etc.
Which best describes nitrogen fixation?
Answer:
Nitrogen fixation is the process of converting nitrogen to a usable form.
1. What is the volume of 4.62 g of mercury? The density of mercury is 13.5 g/cm?
Answer:
The answer is
0.34 cm³Explanation:
The denisty of a substance can be found by using the formula
[tex]Density(\rho) = \frac{mass}{volume} [/tex]Making volume the subject we have
[tex]volume = \frac{mass}{Density} [/tex]From the question
mass = 4.62 g
Density = 13.5 g/cm³
Substitute the values into the above formula and solve for the volume
That's
[tex]volume = \frac{4.62}{13.5} [/tex]= 0.34222……
We have the final answer as
0.34 cm³Hope this helps you
i'm reasking this, i need help with this and it's due today. the answer isn't 30,240 minutes, it's the blanks i need filled in :)
Answer:
Explanation:
24hours ×21 days=
you will get the answeer
The density of osmium ( the densest metal) is 22.57 g/cm^3. What volume would be occupied by 1.50 kg of osmium.
Answer:
Density = Mass / Volume
V = 1.00 * 4.00 * 2.50 = 10 cm³
22.57 g/cm³ = Mass / 10 cm³
M = 22.57 g/cm³ * 10 cm³
M = 225.7 g
Answer: The mass of the block of osmium is 225.7 g.
Explanation:
Thanks to:
HomertheGenius
The density of the osmium is 22.57 g/cm^3 the volume would be occupied by 1.50 kg of osmium will be 33.85 ml.
What is density?The density of a substance is the division of mass of the given substance and the volume of the given substance and its unit will be centimeter cube and it cannot be effect by the temperature.
The density can be calculated by the formula
Density = mass of substance / volume of substance in liter
Density = 22.57 g/cm³
mass = 1.50 kg
Substituting the value in the equation,
22.57 g/cm³ = 1.50 kg / volume
Volume = 22.75 g/cm³ × 1.50 kg
volume = 33.85 ml
Therefore, density of the osmium is 22.57 g/cm^3 the volume would be occupied by 1.50 kg of osmium will be 33.85 ml.
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Calculate the density of a 38.6 g cube of gold with a volume of 2 cm³?
Answer:
Density, [tex]d=19.3\ g/cm^3[/tex]
Explanation:
Given that,
Mass of gold is 38.6 g
Volume, V = 2 cm³
We need to find the density of gold cube. The density of an object is defined as how much mass it has divided by its volume. So,
[tex]d=\dfrac{38.6\ g}{2\ cm^3}\\\\d=19.3\ g/cm^3[/tex]
So, the density of the cube of gold is [tex]19.3\ g/cm^3[/tex].
Write the steps to separate the
Water from salt solution
Answer:
try use distillation
you also can get the salt by evaporate them under the sun
what is the product of aluminum +zinc sulfate solution
Answer:
ZINC ALUMINATE
In Chemistry, a group of students have been presented with 2 test tubes. In both test tubes they observed bubbles rising up in a clear liquid. They are told that hydrogen gas has been produced in one test tube, while carbon dioxide was produced in the other. During this test they have been instructed to collect the gases from each reaction and identify them. How could the students collect and identify the hydrogen gas?
Answer:
Diatomic, or two atoms per molecule, hydrogen can be isolated by electrically separating distilled water. This process is known as electrolysis and creates oxygen gas as well. It is by far the easiest and safest way to collect and store hydrogen gas
Explanation:
im not sure this the correct answer but here u go
1. After 3 half-lives, how much of a 400 gram sample of radioactive uranium-238 remains? The half-life of
U-238 is 4.47 years.
Answer:
In the blue area, people live closely because of its 1.Indutrialised area 2. The land is costly. 3.urbanisation In lighter color areas its farther because 1.Village 2.Farming area 3.Less popular rural area
Explanation:
In the blue area, people live closely because of its 1.Indutrialised area 2. The land is costly. 3.urbanisation In lighter color areas its farther because 1.Village 2.Farming area 3.Less popular rural area ΔΔΔΔΔβαααααααααααααααααααωωωωωωωωωωωω㏒㏒㏒
After one half life, the sample gets reduced to its half of the initial amount. The 400 g will reduces to 200 g after one half life. Thus, after three half life, it will reduces to 50 g.
What is half life?Half life of a radioactive sample is the time taken to decay its half amount. The radioactive isotopes undergo decay by the emission of charged particles. The radioactive decay is a first order reaction.
Uranium is a radioactive element which undergo alpha decay to form stable nuclei with the release of tremendous energy. Given that the half life of U-238 is 4.47 years.
Afterone half life 400 g of U-238 reduces to its half that is 200 g. For the second half life, 200 reduces to 100 g and for the next half life that is after three half lives it reduces to 50g.
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5. Express the number 1.36 x 104 in common decimal form.
A) 136000
B) 0.0000136
C) 0.000136
D) 13600
E) 1360
Answer: D
Explanation: You move the decimal back 4 times.
How many minutes are in 2.25 weeks ?
Answer:
22,680
Explanation:
you multiply the time value by 10080
What is the difference between physical and chemical change in chemistry?
physical changes are those changes which can be reversed in their previous form like ice to water
chemical changes are those changes which cannot be reversed in their previous form
1. the change which are reversable are known as physical change
2.no new substance are formed
3.no change in chemical nature of the substance
4. example: • melting of ice
• tearing of paper etc.
chemical change:1.this are irreversible this can't be reverse
2.new substance are formed
3.it results form a chemical reaction
4. example: • burning of wood
• rusting of iron etc.
hope it helps you :)
18 ) Liquid A and Liquid B are clear liquids. They are placed in open containers and allowed to evaporate. When evaporation is complete, there is a white solid in container B, but no solid in container A. From these results, what can you infer about the two liquids
Answer:
Liquid A is a homogeneous mixture and Liquid B is a heterogeneous mixture
Explanation:
'Liquid' is characterized as 'a substance that is flowing and does not carry a defined shape due to the gap between its molecules.'
As per the details provided, the inference that can be deduced would be:
"Liquid A is a homogeneous mixture and Liquid B is a heterogeneous mixture."
In the given illustration, the results observed lead to the conclusion that Liquid A demonstrates a homogeneous solution because its constituents are evenly distributed. Since homogeneous mixtures are very stable in nature and their components do not get separated. While Liquid B would be characterized as a heterogeneous mixture as its components are visibly separable(white solid remaining) and they can be witnessed through naked eyes.Learn more about 'liquid' here:
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