Thursday
July 28, 2016

Homework Help: Science

Branches of Science

Recent Science Questions

science
A gas in a sealed container has a pressure of 50 kPa at 27°C. What will the pressure of the gas be if the temperature rises to 87°C?
Monday, June 13, 2016 by Anonymous

Science
Iodine-131 is used I'd diagnosing certain medical problems because of the short half-life, which is 8.02 days. Assume the hospital lab uses for 4.52g of iodine-131 in a month. What mass of this radioisotope remains in patients after 32 days?
Monday, June 13, 2016 by Gigi

engineering science
An aeroplane can fly at 250 km/h in still air.How long will it take it to reach a plane 500 km to south-east if a wind is blowing at 80 km/h from west?
Monday, June 13, 2016 by Thabile Ndlovu

Science
If 100 bacteria get into our body and reproduce every 20 minutes how many will there be in 2 hours? Search answer.
Monday, June 13, 2016 by Sonu

SCIENCE
A BRICK WITH MASS OF 6 KG IS DROPPED VERTICALLY FROM A CERTAIN HEIGHT. IT TAKES 4.5 SECONDED FOR THE BRICK TO REACH THE GROUND DETERMINE THE FF. THE HEIGHT FROM WHICH THE BRICK IS DROPPED THE SPEED OF WHICH THE BRICK THE GROUND IT AND THE MOMENTUM OF THE BRICK THE MOMENT JUST ...
Monday, June 13, 2016 by BRONWYNNE

science
what is IUPAC name of ch3-ch2-ch2-ch2=ch2 ???
Monday, June 13, 2016 by somesh pali

Engineering science
A ball is thrown upwards and reaches the ground once again after 7sec how can I calc the total distance covered by the ball.
Sunday, June 12, 2016 by Thandeka

Health Science
(3) Write in full (i) H.I.V -Aids (ii) F.G.M
Sunday, June 12, 2016 by somay

Health Science
Please help me. (2) Discus the following diseases under the following - heading) i. Causative agent ii. Method of transmision iii. Signs and symptoms iv. Control and prevent. 1-Gonorrhae 2- HIV and AIDS 3- syphiles.
Sunday, June 12, 2016 by somay

Health Science
1a) What are controceptive b) Name six types of controceptive c) Name 10 diseases associated with the reproduction system. Please help me
Sunday, June 12, 2016 by somay

Science
One of the least difficult wastes to deal with is nuclear waste. True False*** All the pluming fixtures and toilets should be low flow, which reduces the amount of water needed while still maintaining the pressure. True*** False American consumers have the lowest amount of ...
Sunday, June 12, 2016 by Kaai97

Science
The Environmental Defense Fund, The Friends of the Earth, and The Natural Defense Council, are all divisions of The Environmental Protection Agency. True*** False After the first Earth Day, the Sierra Club expanded to 20 states in 1970. In 1971, the anti-environmental group ...
Sunday, June 12, 2016 by Kaai97

math and science
A space shuttle with a mass of 4,06 X 10kg,orbits earth at a height of 720km above the surface of the earth.calculate the gravitational force experienced by the shuttle
Sunday, June 12, 2016 by Tsuu-mani

Science Chemistry
A sample of beer is 4.6% by Mass C2H5OH. The density of beer is 0.93 g/mL. What is the molar concentration of C2H5OH in this sample of beer?
Sunday, June 12, 2016 by Kay

Science
Two bodies,one held 0.98m vertically above other,are released simultaneously and fall freely under gravity.After 2 seconds,their relative separation is?
Sunday, June 12, 2016 by Amanpreet

science
A car covers 30 km at a uniform speed of 60km/h & next 30km at a uniform speed of 10km/h find the total time taken
Sunday, June 12, 2016 by ft jcch

science
how I can convert Fe(NO3)3.9H2O to aqueous solution containing 45%
Sunday, June 12, 2016 by hatem

Science
When we evaporate a salt solution salt crystals are left in the beaker or utensil but does the same thing happen in case of sugar solution?
Saturday, June 11, 2016 by Diana

Science
Oregon and Washington generate far more hydro-electric power than most states. How does all this hydro-electric power help keep our electric bills low (half the cost of electricity in many states)?
Saturday, June 11, 2016 by Kaai97

Science
What are two downsides to the dams that make all our hydro-electric power possible?
Saturday, June 11, 2016 by Kaai97

Science
Does Aldosterone increases or decrease urine production? Also does it result in higher sodium levels in the urine? Thank you
Saturday, June 11, 2016 by Mary Help please

Science
If 10g of magnesium reacted with 5g of oxygen how much magnesium oxide would you produce? How do you know?
Saturday, June 11, 2016 by Molly

leadership development
1.Even though Mike is a great basketball player, he tries with just half effort on drills during practice. This is an example of A wasting talent B getting distracted C allowing others to set goals 2.Jim would like to get a summer internship, but his dad thinks he should work ...
Saturday, June 11, 2016 by jacob

science
why tall tree broke more than short tree at strom.
Saturday, June 11, 2016 by Anonymous

science
a man is running. What is its kinetic energy?
Saturday, June 11, 2016 by Anonymous

science and technology
Which law of chemical combination is illustrated by the fact that 168gFe reacts with 72gH2O to from 232gFeO4 and 8gH2?
Saturday, June 11, 2016 by smriti

science
A 1000kg rocket is set vertically on its launching pad. The propellent is expelled at the rate of 2kg/s. Find the minimum velocity of the exhaust gases so that rocket just begin to rise. Also find rocket's velocity 10second after ignition, assuming the minimum exhaust ...
Friday, June 10, 2016 by swastik

Science
Why is that instantaneous rate of reaction does not change when a part of the reacting solution is taken out?
Friday, June 10, 2016 by Vikrant

science
The resistance of 10m long wire is 10 . Its length is increased uniformly by 25% by stretching the wire uniformly. The resistance of wire will change to (approximately) (A) 12.5 (B) 14.5 (C) 15.6 (D) 16.6
Friday, June 10, 2016 by janvi

Physical Science
If your mass is 76kg, find your acceleration.
Friday, June 10, 2016 by Hannah

Science
Your journey to the centre of the earth took 64 hours at 100km/h. What was the total distance you traveled??
Thursday, June 9, 2016 by Kim

basic science
calculate the work done when a person pushes a car from its stationary position to a distance of 50m applying a force of 200n
Thursday, June 9, 2016 by augustine samson

Science
A 450-g block is attached to a spring of spring constant 45 N/m and is in simple harmonic motion on a frictionless surface with an amplitude of 7.5 cm. A second identical block, moving at 12 m/s in line with the spring, strikes the first one when the spring is at its maximum ...
Thursday, June 9, 2016 by Lucy

Science
CU+H2SO4>CUSO4+H2O+SO2
Thursday, June 9, 2016 by Sunil behera

Science
What mass of iron metal can be obtained from the reaction of 45.6kg Iron (III) oxide Fe3O4 with carbon monoxide CO as given in the following equation? Fe3O4 + 4CO = 3Fe + 4CO2
Wednesday, June 8, 2016 by URGENT HELP

SCIENCE
a 2cm high object is placed at a distance of 20cm from concave mirror ,the real image is formed at 40cm from the mirror.calculate the focal length,size of image and magnification?
Wednesday, June 8, 2016 by SUPRIYA

Science
The volume of a gas increases from 18.7 m3 to 25.1 m3 while the pressure changes from 1.82 atm to 1.41 atm. If the initial temperature is 353 K, the final temperature of the gas is K.
Wednesday, June 8, 2016 by Jasmine

science
What are some ways to minimize impacts a water dam creates on the ecosystem?
Wednesday, June 8, 2016 by Delaney

Math
1. Subtract (4x + 2y) – (8x – 3y). –4x – y 12x – y 12x + 5y –4x + 5y 2. Determine the best name for the quadrilateral. Graphic rectangle rhombus trapezoid parallelogram 3. Which figure has rotational symmetry for an angle of rotation of 270°? ...
Wednesday, June 8, 2016 by Help me PLEASE

Science
What mass of iron metal can be obtained from the reaction of 45.6kg Iron (III) oxide Fe3O4 with carbon monoxide CO as given in the following equation? Fe3O4 + 4CO = 3Fe + 4CO2
Tuesday, June 7, 2016 by Road

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
can you guy check my answers for science 1. Which of the following is ture about the electric charges below? A. The ball on the right had a positive charge and the ball on the left has a negative charge. B. The ball on the left has a positive change and the ball on the right ...
Sunday, June 5, 2016 by checking my answers

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

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