Science

Recent Questions

science
Shubham lives in avillage,where drinking water facilites are very limited.they collect drinking water from a pond people also bathe and wash their clothes in that pond.he observed the most of the people are suffering from diarrhoea he advised people to use chlorine tablets in ...

science
In a chemical reaction,10.g of sodium carbonate reacted with 12 g of ethanoic acid.the poducts were 4.4g carbon dioxide,1.8g of water and 16.4g of sodium ethanoate. (a) write a word equation ,clearly showing the reactants and products as given above. (b) also show that this ...

science
Istopes are useful in many ways.write any three applications of istopes in various fields.

science
Number of electrons in the outermost m shell of an element is 3.find its atomic number.

science
A sample of certain mass of a gas was collected and it was found that the number of atoms and the nuber of molecules in the collected sample are equal.find this observation infer the type of molecules of the gas.

science
A sample of certain mass of a gas was collected and it was fond that the number of atoms and the number of molecules in the collected sample are equal.from this observation infer the type of molecules of gas.

science
A solid of relative density 1.25 is found to weigh 12 g in water.find its weight in air.

science
Using your reaction time, estimate the diestance a car would travel at 20m/s (45 mi/h) before you could apply the brakes. To get the deistance in meters you multiply the speed in m/s by your reaction time in seconds

science
is it possible for an object's weight to change while it's mass remains constant?

physical science
What amount of iron may react with 36gm of water vapour?

Science
Which of the following are structures that rely on capillaries for exchange or movement of small molecules? A. teeth, aorta, ureter B. cartilage, epidermis, larynx C. nephron, villi, alveoli D. leukocytes, atrium, bronchi Which of the following are structures that rely on ...

Science
1. Suppose a patient comes in to see a physician. This patient lacks the ability to keep warm and needs to wear heavy clothing even during mild temperatures. Which system of this patient’s body should the physician be concerned about? A. integumentary B. Skeletal C. ...

science
What part of a nerve cell receive the nerve impulse? Dendrite, Synapse or the Axon?

science 7th
A piece of copper is 1 meter long and has a density of 8.8g. If you cut the wire exactly in half, what is the density of one of the pieces

science
When a nerve impulse reaches a synapse, a nerve cell transfers the impulse to the next nerve cell by releasing D.electric currents. C.chemicals B.heat. A.pressure. Is it D?

Science
The current population in the United States is 318,968,000. The rate is .72. What will the population be in the United States in 10 years? Show work please.

Physical Science
Henry Heavyweight weighs 1200N and stands on a pair of bathroom scales so that one scale reads twice as much as the other. What are the scale reading?

science
Which statement is true regarding nuclear energy? (Points : 1) Nuclear power produces no greenhouse gasses and thus poses no environmental threats. Nuclear plants rely on a massive industrial infrastructure using fossil fuels. Due to strict safety regulations, nuclear power ...

Science
Two cannons are set up next to each other. Cannon A is set to fire at an angle of 50 degrees and B at 40 degrees. Prove that the range will be the same for both cannons.

science
A mixture of sugar and water can be separated by ______________. Choose ALL that apply. (2 points) Box 1. using a magnet Box 2. boiling the mixture Box 3. evaporating the mixture Box 4. using a filter I picked "Box 2" and "Box 3"

Science
A Block rests on a horizontal surface.The normal force is 20 N.The coefficient of static friction between the block and the surface is 0,40 and the coefficient of dynamic friction is 0,20. What Is the magnitude of the frictional force exerted on the block while the block is at...

Science
A swimmer that pushes the water back with feet and arms What will happen to the movement of the swimmer as they push the water back?

science
Which of the following represents a heterogeneous mixture? A.saltwater B.air C.bleach and water D.chicken noodle soup I think the answer is D. Chicken noodle soup. I don't know exactly.

Science
A swimmer that pushes the water back with feet and arms 1. What will happen to the movement of the swimmer as they push the water back? 2. If the swimmer exerts 5 n of force on the water how much force does the water exert back on swimmer? Please help

Science
Which of the following is true about producers? A.They are helpful to some ecosystems and not essential to any ecosystems. B.They are helpful to all ecosystems but not essential to any ecosystems. C.They are essential to some ecosystems D.They are essential to all ecosystems

Science
What physical features are caused by plate tectonics?

Science
Explain a metal power/laundry line which hang droop on a very warm day

science
an arrow is fired directly horizontal off a cliff that is 10.0 meters tall with a velocity of 65.5 m/san arrow is fired directly horizontal off a cliff that is 10.0 meters tall with a velocity of 65.5 m/s. How long is the arrow in the air?

life science,geography,maths litracy,tourism
What job will i do if i am doing the above subject

Science
When a truck and a small car both traveling at 50 miles/ hour collide with each other 1. which vehicle has more momentum before the collision and why? 2. Which vehicle will be more effected by the collision and why? 3. Which vehicle will have more momentum after the collision...

Science
Please help A swimmer that pushes the water back with feet and arms What will happen to the movement of the swimmer as they push the water back? If the swimmer exerts 5 n of force on the water how much force does the water exert back on swimmer?

Science
A swimmer that pushes the water back with feet and arms what is the reaction force? What is the action force?

Science
How is mass and inertia alike

Science
A swimmer that pushes the water back with feet and arms what is the reaction force? What is the action force? What will happen to the movement of the swimmer as they push the water back? If the swimmer exerts 5 n of force on the water how much force does the water exert back ...

Science
How are mass and inertia related? How do you calculate momentum? Please help

Science
Hello please help me with another question! - One fruit fly is heterozygous for long wings, and another fruit fly is homozygous for short wings. Long wings are dominant to short wings. Using a punnett square, find out what percent of the offspring are expected to have short ...

Science
suppose a male mouse is Bb and a female is bb. What percent of the mice offspring from these two mice would you expect to have black fur?

science
Calculate the molarity of a solution which contains 6.456g of Na2CO3 dissolved in 250.0 ml of solution.

science
On a frictionless air track, cart A hits cart B moving at a velocity of 2 miles per second to the right. Which answer predicts what will happen?

Political Science
In Gibbons v. Ogden, the Supreme Court held that?

Political Science
If the Supreme Court were to rule that gay marriage is a fundamental right, under the Equal Protection Clause of the Fourteenth Amendment, that would mean?

Political Science
In Marbury v. Madison, the Supreme Court established the principle of constitutional review by? I am seconding guessing myself on my answer so can you point me the right direction is it: claiming that Section 13 of the 1789 Judiciary Act providing that the Supreme Court will ...

Mixture science help
Which type of mixture has the largest particles? Explain how you know.

Political Science
In Gibbons v. Ogden, the Supreme Court held that? In Chapter 7 Federal Authority and the Limits to State Authority. If I am understanding right that the 10th Amendment trumps the Interstate Commerce Clause. I am I right?

science
An astronaut visits a moon of Saturn, and decides to measure the accel. of gravity. He ties a rock (m=2 kg) to a rope (1.25 m), pulls the rock back 10 degrees, and releases it into simple harmonic motion. What is the accel due to gravity on the moon? I have no idea where to ...

8th grade Science please help
Why is soda in an unopened bottle a homogenous mixture?

fundamental concept and skills
Which approach to literacy best connects mathematics and science to the real world? A. Balanced reading B. Phonics C. Whole language D. Structured reading c.

science answer fast please!
Could a molecule contain only one atom? Explain your answer.

science
Why is graphite considered an element?

Science
jellyfish sometime squeeze in the size of their bodies. this pushes a stream of water from the back end of their bodies. according to newtons third law of motion, how will this behavior affect the movement of the jellyfish? a. The jellyfish will move forward b. The inertia of ...

Pure math,Life science,Geography and History
Hi I'm grade10 and I was wondering if you's could help Me to get a career examples after matric because my school took away our Physics for unknown reasons so insted of Physics or another subject that would help you in the future they gave us History please help me with a ...

Natural science
What is vegetative reproduction?

Science
What is the central theme of the “As Cheap as Coal” portion in Section 8.1 of your text? (Points : 1)

Science
geologist finds fossils of a lizard-like dinosaur and a fern-like tree in layers that are 1.0 m and 1.5 m deep. However, in a layer that is 2.0 m deep, he finds fossils of bony fish and shellfish. Which explains? 1. The continent shifted to a polar region. 2. The ancient land...

Science
which conditions characterize a high-pressure area? 1. low density, low humidity 2. high density, high humidity 3. high density, low humidity** 4. low density, high humidity

Science
Describe how the Triassic period was a transitional time period during the Mesozoic era. Explain why the boundary between t he Triassic and Jurassic periods is similar to the boundary between the Permian and Triassic periods.?

environmental science
Its a request:(answer sincerely and think like you're in a pageant) If you were crowned tonight, what can you contribute to heal the wounds of Mother Nature?

Science
In humans, the allele for curly hair and the allele for straight hair show incomplete dominance. The offspring of a curly-haired person and a straight-haired person will have... I think it is curly and straight hair. Help please ?

Science
How can an offspring inherit a recessive trait ? Is it when both parents carry that trait? In the plant shown (plant is an orchid with equal numbers of small white and purple specs on each petal) , the allele for the purple flower color is most likely: Dominant, recessive, ...

environmental science
This is a request: Can you share your opinion about drought and what can you do about it?

Science
What factors will be important in deciding the future use of energy resources?

science
Explain how the chemical compounds that were once in a piece of granite exposed on the top of a mountain may today be found in a piece of basalt.

Mowat Park High School
History, geography, life science and math litrecy what career choice do or career field do I go to with these subjects

science
what is the central theme of the "As Cheap as Coal" portion in Section 8.1 of your text?

Science:Physics
Nilo drives is van with an average velocity of 45.0 km/h along the North Expressway. How long will it take him to drive 350 km on a perfectly straight highway

Science
2. why is gas able to flow? a) Its particles have melted and can move around b) Its particles have high viscosity and can move around c) Its particles have enough energy to move around d) Its particles have enough pressure to move around 3. Which of the following is true about...

7th grade science
Can you help me with genetics questions? Directions: In each set, tell which word does not fit with the others. Then explain why you think it does not. You must mention all words. 1. Aa, Heterozygous, Hybrid, Homozygous Ans: Homozygous doesn't belong because letters are mixed...

Science
Which type of climate receives the most intense solar energy? A. grasslands climate B. tropical climate** C. polar climate D. temperate climate

Science
In terms of density and humidity, which conditions characterize a high-pressure area? A. low density, low humidity B. high density, high humidity C. high density, low humidity** D. low density, high humidity

Science
Which type of weather is most likely produced by a cold front? A. light to moderate precipitation B. moderate to heavy precipitation C. no precipitation** D. heavy precipitation and thunderstorms

Science
A geologist finds a layer of rock that is made of medium-grained sands and is porous. What type of rock did the geologist find? A. sandstone** B. conglomerate C. coquina D. limestone

Science
How would a geologist identify an igneous rock as intrusive? A. An intrusive rock has coarse grains because it cooled more slowly on the surface of the earth. B. An intrusive rock has coarse grains because it cooled more slowly beneath the surface of the earth.** C. An ...

Science
How do plants produce chemical weathering? A. They secrete carbon dioxide that combines with water on the rocks and dissolves the minerals in the rocks. B. They secrete chemicals that freeze the water within the cracks of the rocks and break down the rocks. C. They secrete ...

Science
Which explains how climate data were used as evidence to develop the theory of continental drift? A. Similar glacial deposits and sediments were found on areas of the same continent that are now thousands of miles apart. B. Different glacial deposits and sediments were found ...

Science
Earthquakes occur on the earth today, so we can assume they occurred in the past. Which important geologic principle does this sentence support? A. original horizontality B. faunal succession C. superposition D. uniformitarianism**

Science
According to the theory of plate tectonics, how do two plates interact to form coastal volcanic ranges? A. A continental plate slides along an oceanic plate at a convergent boundary. B. A continental plate collides with another continental plate at a convergent boundary. C. An...

Science
A mineral breaks into flat sheets when struck with a rock hammer. Which property of a mineral is being measured? A. hardness B. cleavage** C. streak D. color

Science
Which explains the greenhouse effect? A. Greenhouse gases like water vapor and carbon dioxide trap heat in the atmosphere, thereby radiating heat energy back into space. B. Greenhouse gases like water vapor and carbon dioxide release heat in the atmosphere, thereby radiating ...

Science
Which explains how plants can chemically weather a rock? A. Plant roots get into cracks and secrete water, which freezes and breaks apart the rocks. B. Plant roots get into cracks, grow, and break apart the rocks. C. Plant roots get into cracks and secrete acids, which freeze ...

Science
1. Which of the following best summarizes the function of the respiratory system? A. to transport oxygen to cells and wastes away from cells. B. to protect the organs in the chest cavity C. to move oxygen from the air into the body and carbon dioxide from the body into the air...

Science
Please could someone check these for me. 1In a series of rock layers, a geologist finds fossils of a lizard-like dinosaur and a fern-like tree in layers that are 1.0 m and 1.5 m deep. However, in a layer that is 2.0 m deep, he finds fossils of bony fish and shellfish. Which ...

7th grade science
Can you help me with genetics questions? Directions: In each set, tell which word does not fit with the others. Then explain why you think it does not. You must mention all words. 1. Aa, Heterozygous, Hybrid, Homozygous Ans: Homozygous doesn't belong because letters are mixed...

science
In the below the results are given for the saprate mating of tomato plant what are the most probable genotype for the parents in each instance? 1.purple, cut¡Ágreen cut- cut purple-321, potato purple-101, cut green-310, potato green-107 2.purple, cut¡Ápurple potato-cut ...

Science!!
**PLEASE HELP FAST** how is newton's second and third law of motion important to your everyday life?? **PLEASE HELP**

Physical science
Which property of aluminium makes it suitable to be used for overhead electricity cables

Earth Science to Ms.Sue
7.   What gives the gem amethyst its purplish color? A. Quartz B. Titanium C. Oxygen D. Iron The answer was not A, got this question wrong.

Earth Science
15.   Which statement best describes the composition of magma?      A. Magma is an element all its own.B. Magma contains the same elements as snow.C. Magma contains only three elements.D. Magma contains the same elements as Earth's crust. 

Earth Science
   What element has 81 protons in the nuclei of its atoms?  A. Thallium B. Uranium C. Platinum D. Lead A?

Science-Chemistry
Can you please help me solve r1/r2 = sqrt(M2/M1)for M1. My answer: M1=M2r2^2/r1^2 Is this correct?

Earth Science
Please check down below.

Earth Science
10.   Which statement best describes the formation of diamonds?  A. Diamonds form in kimberlites under very low pressure. B. Diamonds form in talc under very low pressure. C. Diamonds form in talc under very high pressure. D. Diamonds form in kimberlites under very ...

Earth Science
  A heterogeneous mixture is a  A. mixture in which its components retain their identity. B. component added to sand that makes it inseparable. C. mixture that always contains water. D. mixture in which its components can't be separated.  A?       

science
If a kestrel eats a mouse that eats grass, the kestrel is a

Science
1) Which of the following is a chemical change? (1 point) Boiling of water Melting a cube of ice Dissolving 10 grams of salt in water Splitting water into hydrogen and oxygen*** 2) What is the mass of water that results from combining 2.0g of hydrogen with 16.0g of oxygen? (1 ...

Science
I would really appreciate it if someone checked my answers and told me if they were right. Thx. ~Ashley 1. Which of the following determines the strength of the force of gravity between two objects? Check all that apply. A: The speeds of the objects. *B: The masses of the ...

Partly science, partly curiosity
Does iodized salt mold?

Science
How do lawmaker make good environmental decisions? A. By relying on the short-term benefits of an environmental issue. B. By weighing down the costs and benefits of an environmental issue C. By relying only on the economical impact of an environmental issue D. By relying only ...

Science
Which kind of pollution is illustrated by a pipe gushing polluted water into a river? A. Point source B. Nonpoint source C. Carbon source. D. Resource source

science
an animal that basks on a warm rack during the morning hours but retreats to the sade of the rocks during the middle day is most likely a(n) A)ectotherm B) endotherm C)vertebrate D) chordate

science
most bacteria are A) unicellular eukaryotes B) unicellular prokaryotes C) multicellular eukaryotes D) multicellular prokaryotes

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