Friday
September 30, 2016

Homework Help: Science

Branches of Science

Recent Science Questions

Science
What is the equation of the street line that passes through the points 1 and -4 and 3 and 2
Tuesday, June 7, 2016 by Anonymous

Science
A student wants to neutralize 1000 ml of .25m lioh with 0.75m hbr. How much hbr are they expected to use? Sho your work.
Tuesday, June 7, 2016 by Mika

Science
what is the concentration of sulfuric acid if 0.25l of it is neutralized by 0.56l of 0.030m koh?
Tuesday, June 7, 2016 by Mika

Science
Which symbol correctly represents an element (D) whose atoms contain 15 protons and 20 neutrons? A. 20/15 D B. 15/20 D C. 35/15 D D. 15/35 D C?
Tuesday, June 7, 2016 by Ms. Sue Please help me

Science
Which of the following statements is not consistent with the results obtained in Rutherford’s gold foil experiment? A. The nucleus of an atom is positively charged. B. The nucleus of an atom contains almost all the mass of the atom. C. Atoms are composed mainly of empty ...
Tuesday, June 7, 2016 by Ms. Sue Please help me

Science
In order to analyze the wastewater containing cu2+ from a manufacturing process, 1.0L of water was evaporated to 10.0mL, then placed in a spectrophotometer tube. The absorbance was found to be 0.30. Using your calibration curve, calculate the number of milligram of Cu2+ in 1....
Tuesday, June 7, 2016 by Tyler

science
a farmer has sown seed too deep. what is he likely going to observe?give reasons.
Monday, June 6, 2016 by tushar

Science
Shale often contains fossils of leaves. Question: If the gastropods listed in line 3 and line 6 were collected from shale containing leaf fossils what would their possible age be? Question: Could you use radiocarbon dating to assign a numerical date/age to this rock unit? ...
Monday, June 6, 2016 by Jessica

Math
Jason measured rainfall for a science project. Last week it rained 3 1/8 inches in all. This week it rained 1 7/8 inches in one day and 2 3/4 inches on another. How many more inches did it rain this week then last week? Please explain how you got your anwser
Monday, June 6, 2016 by Cindy

Science
what the definition of age range in earth science?
Monday, June 6, 2016 by Jessica

Science ~ Astronomy
Which evidence provides support for the nebular theory: a) scientists have observed the formation of a distant solar system b) the nebular theory has been proven mathmatically c) astronomers have observed protoplanetary disks around distant newborn stars d) none of the above I...
Monday, June 6, 2016 by Zee

Science
Why Devonian could not be considered an index fossils? How can the occurrence of fossils and their known age ranges be used to date rocks? Need help by understanding the question.
Monday, June 6, 2016 by Jessica

trade science
Final length of the bar of copper whose original length was 75mm When heated through 50 degrees
Monday, June 6, 2016 by Joseph

Science
Which of the following is true concerning the Little River Salt Marsh Restoration Project? a. It revolved around restoring tidal flow with culverts. b. It is a 20 year old conservation effort. c. It was immediately successful upon inception. d. It used massive water pumps to ...
Monday, June 6, 2016 by Science help anyone???

Science
How can the occurrence of fossils and their known age ranges be used to date rocks?
Monday, June 6, 2016 by Jessica

Science/Anatomy
I have the formula to the problem but am unsure of my answer.. Problem: Calculate the cardiac output if heart rate (HR) is 90 beats per minute, stroke volume (SV) is 110 ml/beat, end diastolic volume (EDV) is 140 ml, and end systolic volume (ESV) is 30 ml. select corect answer...
Monday, June 6, 2016 by Mary/please help

trade science
Co-efficient of cubical expansion
Monday, June 6, 2016 by Joseph

trade science
Final length of the bar of copper whose original length was 75mm When heated through 50 degrees
Monday, June 6, 2016 by Joseph

maths,science, physics
A block of mass 50kg was left to slide down a ramp elevated at an angle of 45 decrease as shown in the diagram below (assume g=9.8 ms^-2). I . Calculate the net force causing the block to slide down the ramp (assume no friction) II. Calculate the net force causing the block to...
Sunday, June 5, 2016 by Oxy

Science
Calculate the mass of 3.20 mol of sodium hydroxide, NaOH. M(NaOH) = 40.0g mol-1 Would the following be the correct workings? n= 3.20 mol M=40.0g mol-1 m(NaOH) = n x M = 3.20 mol x 40.0g mol-1 = 128 g NaOH Is this the correct workings?
Sunday, June 5, 2016 by Road

maths,science, physics
A toy locomotive of mass 420g moving at 30cm s^-1 south collides with a carriage of mass 200g moving at 30cm s^-1 north. If they become couple together, what is their common velocity after the collision?
Sunday, June 5, 2016 by Oxy

maths,science, physics
A bullet of mass 20g is fired from a rifle of mass 4kg with a speed of 500ms^-1.Calculate the initial velocity of the recoil of the rifle.
Sunday, June 5, 2016 by Oxy

maths,science, physics
A mass of 2kg resting on a smooth level table is connected by a light in extensible string passing over a frictionless pulley to a suspended 3kg mass (imagine as shown on the diagram).Find: I.The tension in the string. II. The magnitude of the acceleration of the two masses. ...
Sunday, June 5, 2016 by Oxy

maths,science, physics
A small cart of mass 300g when emty can move freely on a horizontal surface. The cart contains 100g of sand and moves initially with speed of 18cm s^-1. a)what would be the speed of the cart if a further 200g of sand were dropped vertically into it from a stationary container...
Sunday, June 5, 2016 by Oxy

maths,science, physics
A truck of mass 4×10^3 moving at 3.5 ms^-1 collides with a stationary truck to which it becomes automatically coupled. Immediately after the impact the trucks moves along together at 2 ms^-1 in the same direction. Find the mass of the second truck.
Sunday, June 5, 2016 by Oxy

science
The 140-million year-old fossil of a tortoise was recently found about 700 meters deep in a coal mine in northeast china. Scientists studying the fossil believe that it represents a previously unknown species? Which of the following is the best conclusion based on the data ...
Sunday, June 5, 2016 by kizzi

English
Hello. Dear Ms.Sue, I would be very grateful for your advice. 1) Do you think it's possible to say "the holistic phenomenon of science" (meaning "science as a whole")? 2) Do you think I used the articles correctly in the following "the interaction ...
Sunday, June 5, 2016 by Ilma

science
Ms. Sue did you forget about my other questions?
Sunday, June 5, 2016 by kizzi

science
right-handers exhibited an equal or more active brain response in slightly more than one-fourth of the drug trials, compared to left-handers. This statement should be classified as 1 the problem= the main issue or subject being investigated in the study 2 a method= a procedure...
Sunday, June 5, 2016 by kizzi

science
After drugs were administered, the brain activity of each person was recorded. This statement should be classified as 1 the problem = the main issue or subject being investigated in the study 2 a method= a procedure , process, or approach used to investigate the problem 3 a ...
Sunday, June 5, 2016 by kizzi

science
Can someone please check my other answer from Saturday June 5 @ 10:29 please thank you ?!
Sunday, June 5, 2016 by kizzi

science
left-handed people demonstrated greater brain activity than right-handed people when under the influence of drugs. This statement should be classified as 1 the problem =the main issue or subject being investigated in the study 2 a method = a procedure, process, or approach ...
Sunday, June 5, 2016 by kizzi

science
3.5g of zinc react with excess dilute hydrochloric acid to produce hydrogen gas at STP,calculate mas of hydrogen gas produced
Sunday, June 5, 2016 by mbuyisela

Science
Please My Answer To My Question
Sunday, June 5, 2016 by Charity

Science
Using A Well Labelled Diagrams,briefly Describe How You Would Determine The Density Of An Irregular Objects
Sunday, June 5, 2016 by Charity

science
What is a balanced chemical equation for the combustion of cooper?
Sunday, June 5, 2016 by kuhle ngcezu

Science
If 100 bacteria get into our body and reproduce every 20 minutes how many will there be in 2 hours?
Sunday, June 5, 2016 by Sonu

science
why do primitive organism have lesser number cells as compared to more advance form?
Sunday, June 5, 2016 by Anonymous

Science
I've been asking questions and all you so called "helpers" (such as Reed, Writeacher, etc.) you are all being sarcastic. I have no interests to cheat, but you don't listen to my side notes. I am going to ask one more question, and again, be don't be ...
Saturday, June 4, 2016 by FYH

science
the brains of left handers may be more sensitive to drugs, says a Swiss researcher, that may be why more people are right handed. Peter Irwin of the chemical firm Sandoz limited, in Basel, gave 88 subjects 12 different drugs, the used electroencephalograms (EEG) to record ...
Saturday, June 4, 2016 by kizzi

science
could you use potassium nitrate to test for fluoride in mouth rinse? Is potassium nitrate a water soluble.?
Saturday, June 4, 2016 by Janet

science
Three equal-sized pans containing distilled (pure water),ocean water (3 percent salt),and water from the Great Salt Lake in Utah (about 20 percent salt)are placed in freezer. Which of the following would be the order in which these three liquids would freeze? 1 distilled water...
Saturday, June 4, 2016 by kizzi

science
which of the following would be a disadvantage of boiling food in salted water rather than using pure water? 1 A only 2 B only 3 C only 4 D only 5 A and D only B ONLY is the answer?!
Saturday, June 4, 2016 by kizzi

Science
A machine has velocity ratio of 5 and is 60% efficient. What effort would be needed to lift a load of 200N with tge aid of this machine?
Saturday, June 4, 2016 by Selasi

science
Find the angle of friction when rod starts sliding
Saturday, June 4, 2016 by anu

Science
The Haber-Bosch process, devised in the early 20th century, revolutionized global industry. It provides a way of “fixing” atmospheric nitrogen into ammonia, allowing for the production of fertilizers and the many nitrogen-based chemicals we use today. The reaction is...
Saturday, June 4, 2016 by John Lee

Science
Why are boats more efficient than airplanes? They use less fossil fuels to move
Saturday, June 4, 2016 by David

Earth Science
Why are boats more efficient than airplanes? They use less fossil fuels to move
Saturday, June 4, 2016 by mike

Political science
what does realism explain best and what does it miss? what does liberalism explain best and what does it miss? what does radicalism best explain and what does it miss? what does Constructivism best explain and what does it miss?
Saturday, June 4, 2016 by Kammy

science
A locomotive train is on its way from Chicago, IL to Madison, WI. The trip is said to last 3.15 hours. When the train arrives in Madison the conductor notices it actually took them 3.26 hours. The train company prides itself on always having its trains to the station within a ...
Saturday, June 4, 2016 by Janet

Science
1.Asolid sphere has amoment of inertia of 0.8kgm2&diameter 10cm rolls down along an inclined plane of length 80cm which is inclined at 37` to the horizontal .What is the transitional momentum of the sphere as it reaches to the foot of the inclined plane?
Friday, June 3, 2016 by Melkamu

advanced science
A 230 kg steel crate is being pushed along a cement floor. The force of friction is 480 N to the left and the applied force is 1860 N to the right. What is the acceleration of the crate? (Hint: remember to find net force first) a=6.00 m/s2 a=28.1 m/s2 a=8.10 m/s2 a=6.0 m/s2
Friday, June 3, 2016 by Beth

advanced science
A 230 kg steel crate is being pushed along a cement floor. The force of friction is 480 N to the left and the applied force is 1860 N to the right. What is the normal force? A. 480 N down B. 480 N up C. 2300 N down D. 2300 N up
Friday, June 3, 2016 by Beth

advanced science
A 230 kg steel crate is being pushed along a cement floor. The force of friction is 480 N to the left and the applied force is 1860 N to the right. The forces acting on the crate are __________________. A. balanced B. unbalanced
Friday, June 3, 2016 by Beth

science
a body of mass 2 kg is thrown vertically upward with kinetic energy 245 J. The acceleration due to gravity is 9.8m/s^2 the kinetic energy of the body will become half at a hieght of
Friday, June 3, 2016 by khovidh

science
Forces of 23 N and 41 N act at a point and are inclined at 90° to each other. Find, by drawing, the resultant force and its direction relative to the 41 N force.
Friday, June 3, 2016 by norest

Science
Explain how you would prepare 250cm^3 of 0.2 m NaOH.
Friday, June 3, 2016 by Blessings

Science
Arrangethe increasing of bp for given molecule and given reason h2o, h2s, h2se. H2te
Friday, June 3, 2016 by Sneha

English
Khianna is preparing an informational presentation for her science class. Her presentation discusses three different theories about what killed the dinosaurs 65 million years ago. The first theory is that an asteriod hit the earth, the second theory is climate change, and the ...
Friday, June 3, 2016 by Bob

Science
4MV=4×?V
Friday, June 3, 2016 by Zeenat

English
Dear Ms.Sue, thank you so much for your help. Please help me with a few more problems. 1) "the thesis defines the integrity and continuity of the process of the emergence of natural science" (maybe too many OF?) 2) "its nature is displayed in the(?) influence on...
Thursday, June 2, 2016 by Ilma

Science
A force of 32.3 N is applied to a 5.87 N box resting on a table. If friction acts with a force of 2.11 N, what is the acceleration of the box?
Thursday, June 2, 2016 by Morgan

Science, please help ASAP!!!
help me fill me fill in the blanks please??? My options:adaptation, body, homologous structures, inheritance, older, artificial selection, overproduction, punctuated equilibrium, common ancestor 1) Similarities in the early development of chickens and opossums suggest that ...
Thursday, June 2, 2016 by Universal Almighty

science
Why do human beings use running shoes,winter boots, skis, or flippers? Why are these not biological adaptations?
Thursday, June 2, 2016 by Delaney

Science
The electric field due to a charged conducting sphere of radius 10 cm , at a distance of 20 cm from the centre of the sphere is 1.5*10pow3 NC-1 and points radially inwards.what is the charge on the sphere ?
Thursday, June 2, 2016 by Himanshu

Science - Chemistry
How many atoms in a diamond.
Wednesday, June 1, 2016 by Ebony

science
How can I find the number of mole of 0.25g of CuSO4?
Wednesday, June 1, 2016 by culleyn

science
When a particle starts from rests and moves with constant acceleration then why its path is always a straight line?
Wednesday, June 1, 2016 by priya

Physical Science
Diamond is a covalently bonded substance made of pure carbon. Each carbon atom has six total electrons so this means carbon shares ________ electron(s) with other carbon atoms. A) one B) two C) four D) six Help Please!
Wednesday, June 1, 2016 by Ben Dover

math
Naron is learning for pre-second semester examination. He divides 8 hours per day for learning science, mathematics and literature with the ratio of 2 : 3 : 1. Find the number of hours he studies each major.
Wednesday, June 1, 2016 by dara

Science
A body is moving with an initial velocity of 36km/hr accelerates uniformly at the rate of 4m/s for 15s. Calculate the total distance travelled in 20s and the final velocity?
Tuesday, May 31, 2016 by Kimi

Maths,Science,geography
Distinguish between folding and faulting
Tuesday, May 31, 2016 by Athini

science
explain why the surface tension of water is greater than that of methylated spirit
Tuesday, May 31, 2016 by tshegofatso

Math and science
How far apart are these two buildings?
Monday, May 30, 2016 by Lebo

science
If all the nematocysts on a mature man-of-war were filled with poison, what is the total amount of poison (in milligrams) that they would contain? 1. less than one milligram 2. two milligrams 3. five milligrams 4. six milligrams 5. more than eight milligrams I believe the ...
Monday, May 30, 2016 by miss

math, science etc
T=(pq/r)-rq make q subject of formula
Monday, May 30, 2016 by muhammed Darboe

SCIENCE PLZZ HELP!!!
____ is rate of change of position. Speed Velocity Acceleration Displacement 2. Which of the following is the difference between speed and velocity? direction units speed none of the above 3. A planet is discovered that is the same size as Earth and has the same gravitational...
Sunday, May 29, 2016 by gabby

Basic math for science
A sportswear manufacture determines that the marginal cost of producing x worm-up suits is given in dollars by 20-0.015x.if the cost of producing one suits is $25,find the cost function and the cost of producing 50 suits and 100 suits
Sunday, May 29, 2016 by Rose

help science
3 simple steps for DNA duplication I have found so many answers but cant get a concise one. 1. separation - of 2 dna strands unzips ? 2. duplicates ? 3. zips back up ? and then a simple sentence about each
Sunday, May 29, 2016 by danny

Science
A man has a weight of 120kg what will be the Weight of same man on the moon
Sunday, May 29, 2016 by Anonymous

science
Calculate the osmotic pressure 5% glucose Sol. At 298 kelvin?
Sunday, May 29, 2016 by Rinku

science
Which of the following substances would be most effective in relieving the pain caused by a man-of-war sting to one's skin? 1. tap water 2. club soda 3. lipstick 4. perfume 5. lemon juice help this is a hard one
Sunday, May 29, 2016 by miss

7th grade science final
review Question -- 3 simple steps for DNA duplication I have found so many answers but cant get a concise one. 1. separation - of 2 dna strands unzips 2. duplicates 3. zips back up and then a simple sentence about each
Sunday, May 29, 2016 by Danny

science
What can be concluded if the family finds out the lights in the bathroom work, but the floor lamp and tv set still do not work? 1. The electrical service to the cabin has not gone off. 2. The bathroom lights are on the same circuit as the floor lamp and tv set. 3. The floor ...
Saturday, May 28, 2016 by miss

science
Which of the following statement best describes the two different types of electrical energy involved in the situation above? 1.Both the lightning and the electricity used to light the floor lamp are forms of static electricity. 2. Both the lightning and the electricity used ...
Saturday, May 28, 2016 by miss

science
Which of the comments are examples of hypothesis suggested to explain what caused the lights to go out? 1. A and D only 2. B and C only 3. C and E only 4. D and E only 5. A, C and E only my best answer is 2
Saturday, May 28, 2016 by miss

SCIENCE
Which of the following is equal to the buoyant force of a rock placed in a beaker of water? (1 point) volume of the displaced fluid weight of the displaced fluid volume of the rock weight of the rock
Saturday, May 28, 2016 by gabby

SCIENCE HELP
CAN SOMEONE CHECK THESE!! 1. Which of the following is a reason why a person might want to wear snowshoes if walking a distance in deep snow? (1 point) snowshoes spread the person’s weight out snowshoes reduce the amount of pressure on a given spot snowshoes keep the ...
Saturday, May 28, 2016 by gabby

science
A family is seated around the fireplace in a mountain cabin on a rainy night. A bright flash of lightning lights up the room and is followed in less than a second by a loud clap of thunder. The light bulb in a floor lamp flickers and goes out, as does the TV SET. Fortunately, ...
Saturday, May 28, 2016 by miss

SCIENCE PLZZ HELP!!!
Given equal concentrations, which of the following produces the fewest hydronium ions in an aqueous solution? strong acid weak acid strong base weak base This is the only question i need help on and i have no clue what ut is! any help?
Saturday, May 28, 2016 by gabby

science
If removed from the life cycle, which of the following would have the greatest impact on the productivity of lawns? 1. robins 2. moles 3. toadstools 4. dandelions 5. microorganisms need a little help here?! I think my answer would be 5
Saturday, May 28, 2016 by miss

science
Birds extract more food from a lawn than from an equivalent amount of prairie because 1. lawns contain more moisture than prairies 2. prairies occur at a higher elevation than lawns 3. lawns contain more food than prairies 4. temperatures are higher on lawns than on prairies 5...
Saturday, May 28, 2016 by miss

science
The major advantage provided by worms to a lawn is? 1. attracting birds 2. protecting moles 3. breaking rocks 4. eating weeds 5. cultivating soil I believe my answer is #5 ?!?!
Saturday, May 28, 2016 by miss

physical science
Name the intermolecular forces in each of the above mentioned substance and water
Saturday, May 28, 2016 by lesego mosweu

physical science
Explain why the surface tension of water is greater than that of methylated spirit?
Saturday, May 28, 2016 by lesego mosweu

science
What is the equivalent resistance when resistance of 1ohm and 10raise to 6 ohm are connected in series
Saturday, May 28, 2016 by advaitha sajjevan k

Social science
India: ______decimal _____ :architecture
Saturday, May 28, 2016 by Aman singh

science
Chromium (III) iodate has a Ksp at 25°C of 5.0 x 10–6. 125 mL of a solution contains 0.0050 mol L–1 Cr (III) ion. Possible answers: a. 8.4 x 10–2 mol L–1 b. 2.2 x 10–3 mol L–1 c. 6.3 x 10–2 mol L–1 d. 2.1 x 10–2 mol L–1 ...
Friday, May 27, 2016 by jess

SCIENCE HELP PLS
How does using coal to generate electricity affect the environment? (1 point) Using more coal reduces the amount of pollution from using oil. Using coal improves the quality of nearby water. Using coal, instead of wood from trees, helps improve the environment. Using coal ...
Friday, May 27, 2016 by Annaleigh

Science HELP Please
The following facts are true about Resource A: It grows in nature and takes about five years to reach a mature size. It can be replanted after it is cut down. Resource A is most likely a(n) A inexhaustible resource. B nonrenewable resource. C recycled material. D renewable ...
Friday, May 27, 2016 by Annaleigh

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