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March 25, 2017

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Homework Help: Science

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Recent Science Questions

Science
Draw a dot plot representative of a flow cytometry test that looks at two markers. One marker is diagnostic, while the other marker is prognostic. Identify and name your markers and their detecting antibodies. Complete the plot as you wish and correctly interpret it. 
Tuesday, March 14, 2017 by Moe

Science:Just need quick help
I am very tired and can hardly think straight. Thanks in advance to those who help. The amount of each size particle in soil is the particle size distribution. Is putting soil and/or sand in a bottle of water a good way to determine particle size distribution? Why or why not?
Tuesday, March 14, 2017 by Tori

Science (HELP ASAP)
1. Which of these is not an environmental effect of building dams A. Reduced fertility downstream<<< B. Weed growth downstream C. Increased water temperature D. Soil erosion upstream 2. Which of these is not an environmental effect of destroying wetlands A.smog B....
Tuesday, March 14, 2017 by Ashley

Science
Electromagnetic and mechanical waves have different characteristics that make them advantageous for certain applications. Select the reasons that mechanical waves, such as ultrasound, are used for soft tissue imaging and to identify fractures in metals. Question 1 options: ...
Tuesday, March 14, 2017 by Maya

Science
When plants grow toward sunlight they____ A. Live longer B. Get more light C. Get smaller D. Die faster
Tuesday, March 14, 2017 by Ashley

Science
Which of the following boxes below represent a stable system? Describe how a disturbance to this box would affect it. Use the terms center of mass and equilibrium in your response. Box A: Shaped like a diamond on a flat surface with an arrow pointing downwards. Box B: A square...
Tuesday, March 14, 2017 by Anonymous

physical science
If sam drops a 40 kg mass from a height of 20 meters on earth how much was the potential energy of the mass before he dropped it a-800 j b-784 n-m c-800 n-m d-7840 j e- 200 j
Tuesday, March 14, 2017 by erika

physical science
a 500 kg elevator is lifted 10. How much work was done a 50 j b 50 j /kg c 5000 j d 5000 j/kg degree c
Tuesday, March 14, 2017 by erika

Creating High-Quality Centers
Which of the following statements accurately reflects what we know about facilitating science learning for infants and toddlers? A. It's important to have a science circle each week where the teacher demonstrates a science concept to the infants and toddlers. B. Infant and ...
Tuesday, March 14, 2017 by Priscila

science
If sam drops a 40 kg mass from a height of 20 meters on earth how much was the potential energy of the mass before he dropped it a-800 j b-784 n-m c-800 n-m d-7840 j e- 200 j
Tuesday, March 14, 2017 by erika

Physical Science
What are the products of a double replacement reaction between potassium bromide and silver nitrate? Name the resulting compounds.
Tuesday, March 14, 2017 by Leon

science
1) At body temperature of 36.5 ° C the osmotic pressure of the blood is of 7.80 atm. Calculate the mass of glucose (C6H12O6) that must be added to one liter of a solution containing 5 g / L of NaCl to be able to inject directly into a vein.
Tuesday, March 14, 2017 by michael

science
Suppose an ideal car jack has an input work 2750 J. It lifts a car 0.35 meters in 8 seconds. a. What is the output work of the jack? b. How much power is required to lift the car? c. What is the efficiency of the jack? I can't give a answer because I am very confused.
Tuesday, March 14, 2017 by Anthony

science
Suppose an ideal car jack has an input work 2750 J. It lifts a car 0.35 meters in 8 seconds. a. What is the output work of the jack? b. How much power is required to lift the car? c. What is the efficiency of the jack?
Tuesday, March 14, 2017 by Anthony

Science
Which of the following would best explain why a species of wildflower native to Switzerland is observed growing in the wild in Montana? Wind dispersed seeds of the wildflower.* Water dispersed seeds of the wildflower. A human brought and dispersed the seeds. Is this right?
Tuesday, March 14, 2017 by Dylan

maths
In a group of 50students,35 students like only one subject out of english & science.The ratio of students who like both & who dont like both is 1:2.Find the number of students who like both the subject.
Tuesday, March 14, 2017 by abhisehk

science
a car is used to move a crest of mass of 645kg on a horizontal road the horizontal force exerted is 15000n the coefficient of kinetic friction is 0.8 calculate the acceleration of the car
Tuesday, March 14, 2017 by refilwe

Science
1. What is the main difference between mechanical and electromagnetic waves? A. Mechanical waves involve transfer of energy, electromagnetic waves do not. B. Mechanical waves require a medium to travel in, electromagnetic waves do not.~~~~ C. Mechanical waves have amplitude ...
Tuesday, March 14, 2017 by Help Me Please!!!!!

Science
1. What is the main difference between mechanical and electromagnetic waves? A. Mechanical waves involve transfer of energy, electromagnetic waves do not. B. Mechanical waves require a medium to travel in, electromagnetic waves do not.~~~~ C. Mechanical waves have amplitude ...
Tuesday, March 14, 2017 by Emma

Science
1. What is the main difference between mechanical and electromagnetic waves? A. Mechanical waves involve transfer of energy, electromagnetic waves do not. B. Mechanical waves require a medium to travel in, electromagnetic waves do not.~~~~ C. Mechanical waves have amplitude ...
Tuesday, March 14, 2017 by Teddy

Science
Hybridisation of C in [ CH triplebond C sinlebond CH doublebond CH2 ]
Tuesday, March 14, 2017 by Karuna

science
Two objects slide over a frictionless horizontal surface. The object A with a mass of 5000g is moves at a speed of 4.5m/s toward the object B (mB= 2500g) which is initially at rest. After the collision, both objects are directed to 30O on either side of the original line of ...
Monday, March 13, 2017 by tony

science
Write the structural formula of 2,3,5-trimethyl-4-propylheptane.
Monday, March 13, 2017 by tony

science
1 litre of coffee at 80oC need to be cooled to 40oC. Assuming that all the ice melts and no heat is lost to the environment. Take the specific heat capacity of coffee to be 4200J/kgK, density of coffee to be 1000kg/m3 and latent heat of fusion of water to be 3.34 x 105 J/kg. ...
Monday, March 13, 2017 by tony

basic science
1 litre of coffee at 80oC need to be cooled to 40oC. Assuming that all the ice melts and no heat is lost to the environment. Take the specific heat capacity of coffee to be 4200J/kgK, density of coffee to be 1000kg/m3 and latent heat of fusion of water to be 3.34 x 105 J/kg. ...
Monday, March 13, 2017 by tony

Science
The following sphere is responsible for forming the solid shell of Earth that holds up life? -Hydrosphere -Lithosphere -Atmosphere -Biosphere** Explain the interaction between the four main components of Earth's physical systems. Be sure to include the name of each system and ...
Monday, March 13, 2017 by PoPo

Science
where is the crater of the asteroid that killed the dinosaurs
Monday, March 13, 2017 by Side Walks

Science
What is the main difference between mechanical and electromagnetic waves? A. Mechanical weaves involved transfers energy; electromagnetic waves do not B. Mechanical waves require a medium to travel in; electromagnetic waves do not***** C. mechanical waves have amplitude and ...
Monday, March 13, 2017 by I need help

science
An elephant of mass 500kg stand with all four feet on the ground.Each foot has an area of 0.08m2.Calculate the pressure exerted on the ground.(g=10/s2)
Monday, March 13, 2017 by Doku

Science
What is the difference between short-circuiting and overloading? From what I can gather from my textbook, both happen as a result of external resistance being lesser than the sum of internal resistance.
Sunday, March 12, 2017 by derrickL

Science - Plate Tectonics
Where does the source of heat for Earth’s convection currents come from
Sunday, March 12, 2017 by Jasmine

Science-tectonic plates
What occurrence is caused when transform plates get stuck?
Sunday, March 12, 2017 by Nikko

science
why does the load reaches 50 meters from the ground will the correct position of the PE and KE that the problem isa crane lifted a 1000 kg load to a height of 50 meters from the ground. at which position are the PE and KE of the load equal
Sunday, March 12, 2017 by renalyn

Science
Find molecular mass of an element having- Density= 1.56 gm/l Temp.= 65 degree Celsius Press.= 745mm
Sunday, March 12, 2017 by Anushka

Science
Which tunable property is the great thrust in biological and medical sciences? A) physical B) chemical C) biological D) none
Saturday, March 11, 2017 by Sanjay

Science
What is the increment in power if current increases by 1% and resistance remain constant
Saturday, March 11, 2017 by Sanjay

Math,science,social,Hindi,english
A person weighing 50kg runs up a hill raising himself vertically 10m in 20sec. Calculate the power of the person.
Friday, March 10, 2017 by M.DAVINSI

Science
Granite lasts a long time when it is used for building in areas where
Friday, March 10, 2017 by Jay

Materials Science
The atomic radii of Mg2+ and F-1 ions are 0.072 and 0.133 nm, respectively. (a) Calculate the force of attraction between these two ions at their equilibrium interionic separation (i.e., when the ions just touch one another). (b) What is the force of repulsion at this same ...
Friday, March 10, 2017 by Eflatun

Science
How many grams of NaOH will be needed to prepare 250ml of 0.1M solution:-
Friday, March 10, 2017 by Md Shams Rizvi

Science
When a silvery powdery substance was added to boiling beans,the beans get cooked quicker than normal. what may this be?
Friday, March 10, 2017 by Jonathan

science
were must be the pivot situated on a straight lever 2m long,if a downward effort of 200N at one end is to lift a mass of 50kg at the other end.state the distance from the effort.
Friday, March 10, 2017 by Douglas

Physical Science
If Argon is 39.948, calculate average at kc mass of argon
Thursday, March 9, 2017 by Susan

Mrs Sue Plz help (Science)
How is an mold and a cast related
Thursday, March 9, 2017 by Side Walks

science
A 13,500 kg jet is moved with a thrust of 5,224,700 Newtons west. what is the acceleration of the jet?
Thursday, March 9, 2017 by billy

science
How does a sequoia tree sustain itself and support bad weather if its roots are short?
Thursday, March 9, 2017 by Acasia

Science
How are a mold and a cast related Someone plz help
Thursday, March 9, 2017 by Side Walks

natural science/bio
flow diagram of circulatory and respiratory system combined
Thursday, March 9, 2017 by Anonymous

Science (check my answers)
14. Chemical runoff from fields, oil spills, and erosion is the major source of a. air pollution b. water pollution*** c. hydropower d. renewable energy 15. Which compound causes the depletion of earth's ozone layer? a. ultraviolet radiation*** b. chlorofluorocarbon c. carbon ...
Thursday, March 9, 2017 by EmberShy

Science (check my answers)
11. How do fossil fuels contribute to air pollution? A. By releasing carbon dioxide into the air*** B. By recycling oxygen C. By reversing the greenhouse affect D. By releasing nitrogen into the air
Thursday, March 9, 2017 by EmberShy

Science
1. Which of the following is the most effective way to preserve biodiversity? A. Captive Breeding B. habitat destruction C. habitat preservation*** D. habitat fragmentation 2.which of the following would result in the greatest reduction of waste A)composting food waste B)...
Thursday, March 9, 2017 by EmberShy

Science
Plzz Help me i need help Why is California's high speed rail such a groundbreaking effort??
Thursday, March 9, 2017 by Young Trippy Lil G

Science
Which statement correctly describes the sun and earth? a. the sun and earth both have water. b. the sun and earth both have a surface called the crust. c. the sun and earth both have an atmosphere d. the sun and earth both have breathable air
Thursday, March 9, 2017 by Aisha

science
A ray of light travelling in air strikes the water surface at an Angle of 30 degree calculate the Angle of light refraction if refractive index of glass is 1.5
Wednesday, March 8, 2017 by vikas

chemistry
name an invention or event (related to science or technology) from the past 100 years that you think has helped shape the roles of women today.
Wednesday, March 8, 2017 by ally

science
Formic acid ,HCOOH, is a monoprotic acid. circle the acidic hydrogen. Write the formula of the conjugate base after the acidic hydrogen is lost.
Wednesday, March 8, 2017 by jipah

Science
Calculate and give answer of appropriate number of significant digits A. 7.6 x21.9 B. 2,15 x 3.1 x 100 C. 38/7
Wednesday, March 8, 2017 by Mileena

Science, 10th class
Is the resistance of a resistor change when it cuts into 3pieces
Wednesday, March 8, 2017 by Is the resistance of a resistor change when it cut

Science
1- Freezing of water is ____ change. 2- A solid which dissolve in water is called ____
Wednesday, March 8, 2017 by Hira

Science
In a heat engine, if 700 J of heat enters the system, and the piston does 400 J of work, what is the final internal (thermal) energy of the system if the initial energy is 1,200?
Wednesday, March 8, 2017 by Anonymous

Physical Science
A 10 N object rests on a 10° incline. What is the normal force? What is the parallel force? A 10 kg object rests on a 10° incline. What are the normal and the parallel forces?
Wednesday, March 8, 2017 by Angela

science
A ray of light travelling in air strikes the water surface at an angle of 30 degree calculate the angle of refraction if refractive index of glass is 1.5
Wednesday, March 8, 2017 by vikas

Science
How much more concentrated is 1ml of 0.5mg/ml haemoglobin in 10% sucrose at an absorbance of 2.4, compared to a solution of 0.1ml of 0.5mg/ml haemoglobin in 10% sucrose and 0.9ml of 10% sucrose at an absorbance of 0.350
Wednesday, March 8, 2017 by Lillie

Science
Why is it better to use a micropipette that can transfer 200 microlitres or less, to transfer 200 microlitres, over using a pipette that can transfer 200 microlitres or more?
Wednesday, March 8, 2017 by Lillie

science
How many moles of carbon monoxide are needed to react completely with 108 kg of Fe2O3. Fe2O3(s)+CO(g)→Fe(s)+CO2(g)
Wednesday, March 8, 2017 by Janessa

Science
The seeds develop into BLANK and are dipersed
Tuesday, March 7, 2017 by Juniper

Science
Can Someone explain this? Should other states wait to see if the high-speed rail system works well before starting their own plans for similar systems?
Tuesday, March 7, 2017 by EmberShy

Science
Match the question with the correct conversion factor needed. Column A 1.What is the mass, in grams, of a single atom of carbon?: 2.What is the mass, in grams, of a single atom of iron?: 3.What is the mass, in grams, of a single molecule of water?: 4.What is the mass, in grams...
Tuesday, March 7, 2017 by Elena

Science
What mass of sodium has the same number of atoms as 50.0 g of calcium?
Tuesday, March 7, 2017 by Elena

Science
Discuss your opinion of the consequences of artificial selection and the advantages and disadvantages of using genetic information in society. Use facts from your research to support your opinion. Cite the sources for your facts. Also, discuss your answer to the Apply the Big ...
Tuesday, March 7, 2017 by Valerie

science
10. How does a star's life begin
Tuesday, March 7, 2017 by CJ So Cool

science
1. why can certain stars sometimes be identified as eclipsing binary stars? (1 point)
Tuesday, March 7, 2017 by CJ So Cool

Science
1.Acceleration involves a change in? A.time B.direction C.speed D.both direction and speed I think it's D?
Tuesday, March 7, 2017 by Bee:)

Science Plz help
How were the Aborigine people affected when their children were forced to live with British families or in institutions?
Tuesday, March 7, 2017 by Sid.V

Science: Chemistry
What is the mass percent of oxygen in sodium bicarbonate(NaHCO3)?
Tuesday, March 7, 2017 by SaraK

Science
1. groups/ family of elements are ones which: A. Have the same number of electrons in the valence/ outer engery level B. Have exactly 8 electrons in the valence shell outer energy level C. Have the same number of protons in the nucleus 2. A period represents elements which? A...
Monday, March 6, 2017 by Mileena

Science
What are 4 producers, 4 consumers, and 2 decomposers you would find in a Pennsylvania ecosystem
Monday, March 6, 2017 by Tsundere_Mailbox

Science
PLEASE CHECK MY ANSWERS :) answers marked below 1. Which of Earth’s spheres contains most of its mass? (1 point) atmosphere *** hydrosphere geosphere biosphere 2. Erosion and weathering are examples of which types of forces? (1 point) constructive forces destructive forces...
Monday, March 6, 2017 by Anonymous

Science
Jordan is doing a science fair project on the effects of music and growth of tomatoes.he has two tomato plants, plant A and plant B that he grows in a window and gives the same amount of water. Plant A is exposed to classical music using headphones atttached to the soil. ...
Monday, March 6, 2017 by TiaB✨

science
How do we identify or interpret when to get the screen away or towards the mirror in different situations? Please tell me diff. cases---phy practicals
Monday, March 6, 2017 by meg

Science
How are cheetos made?
Sunday, March 5, 2017 by Bendy

Science
How do you fix an ink machine
Sunday, March 5, 2017 by Bendy

Science
What unit would be the most appropriate to use when measuring(in S1 units)the length of a pencil
Sunday, March 5, 2017 by Ashton

agricultural science,life science,pure maths,geogp
what career i can follow when doing this subjects geography,agricultural science,life sciences,mathematics?
Saturday, March 4, 2017 by lefa

science
The half life of radium is 1590 yrs. how long will it take to 1 gm of element to loose 0.1gm
Saturday, March 4, 2017 by Mehnaaz

mathematics.phyisical science life science and geo
What career you can study with those kinds of subject
Saturday, March 4, 2017 by tinyiko

Science
18. The description of the structure of the atom is called the ___. ATOMIC MODEL 19. In a water molecule, two atoms of hydrogen and one atom of oxygen share electrons. A ______ bond is found in a water molecule. COVALENT BOND 20. Sodium chloride is formed when the metal ...
Friday, March 3, 2017 by Amy@@

Science
1. The current atomic model would be revised if better microscopes were being used to study its structure. better microscopes are invented in the future. new information about an atom’s structure is discovered. ********** a new element is discovered in the future. 2. Melinda...
Friday, March 3, 2017 by Homework help

Essentials og Psychology
The science of the mind questions please for Penn foster. No need of answers. Please help.
Friday, March 3, 2017 by A student

Science
1. granite lasts a long time when it is used for building in areas where
Friday, March 3, 2017 by Help12

Science
1. In paper chromatography, is the substance being tested the solute or solvent? Explain your answer.  I think the substance being tested is a solvent. I think this because it is being dissolved to form the ink on the filter paper.  2. A bucket of paint spills on your ...
Friday, March 3, 2017 by David

history
1. Which of the following statements is NOT true? A. History can be used to control and confuse. B. You cannot learn from something that is not perfect. C. History is not perfect. 2. Which of these is related to Religious Interpretation? A. The importance of a father in a ...
Friday, March 3, 2017 by v

Science
A uniform have metre rule,pivoted at 20cm mark balances horizontally when a mass of 50g is suspended from 4cm mark calculate the mass of the metre rule.
Friday, March 3, 2017 by Francis

science
1. In paper chromatography, is the substance being tested the solute or solvent? Explain your answer. I think the substance being tested is a solvent. I think this because it is being dissolved to form the ink on the filter paper. 2. A bucket of paint spills on your classroom ...
Thursday, March 2, 2017 by Anonymous

Science
which of the following planets are considard rocky venus neptune saturn uranus i think uranus
Thursday, March 2, 2017 by Katelynn

Science
When the temperature equals the dew point, what is the relative humidity? A.zero B.10% C.50% D.100%
Thursday, March 2, 2017 by Blake

SCience
After watching the Farmers and their Lost Dreams: The Dust Bowl Years video segment, reflect back on the stories of two American farming families as they struggled to survive the dust storms that overtook the plains Write a paragraph in reaction to what the survivor shares as ...
Thursday, March 2, 2017 by URGENT HELP

Science- Astronomy
How are Earth and Venus different? I already wrote that they have different atmospheres but I need another reason why are different so can someone help me please?
Thursday, March 2, 2017 by Jiskha Student

science
Astronauts who are working outside the space shuttle require an audio speaker in their helmets because ________. PLEASE HELP!!!!!!
Thursday, March 2, 2017 by swimmerGirl

science plz check
Describe the outer planets. The outer planets, unlike the inner planets, are much larger and made up of gases. They have many moons, and larger rings of ice that go around the entire planet.
Thursday, March 2, 2017 by swimmerGirl

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