Monday
February 27, 2017

Homework Help: Science

Branches of Science

Recent Science Questions

Science
Two boys A and B are at two diametrically opposite points on a circle. At one instant the two start running on the circle; A anticlockwise with constant speed v and B clockwise with constant speed 2v. In 2 minutes, they pass each other for the first time. How much later will ...
Wednesday, October 5, 2016 by Collins

Science homework
john is on a skiing holiday. he starts from rest on a long gentle incline of 6° and the coefficient of kinetic friction between the skies and the snow is 0,06. the weight of john and his skies is 800 n., traveling 100m
Wednesday, October 5, 2016 by Farren

science
The following replicate values were reported for the concentration of magnesium chloride, MgCl2, in mol/L. What value should be reported as the mean concentration of the chloride ion, Cl, converted to ppm? (You may use the simplified definition of ppm.)0.00141, 0.00138...
Wednesday, October 5, 2016 by Lo

Science
john is on a skiing holiday. he starts from rest on a long gentle incline of 6° and the coefficient of kinetic friction between the skies and the snow is 0,06. the weight of john and his skies is 800 n. Traveling 100m
Wednesday, October 5, 2016 by Farren

science
A crane accidently drops a box full of material into a freshwater pool measuring 20 feet long, 10 feet wide, and 6 feet deep before the box is dropped causing the water level to rise to 6.05 feet after the box is dropped. The box is 10x8x12 inches and the material inside ...
Tuesday, October 4, 2016 by tina

Science Check my work PLS
Why do scientists use models of natural systems? (1 point) Scientists use models of natural systems because these systems are often too large, too small, or too complex to study directly**** Scientists use models of natural systems because they like to use art in science. ...
Tuesday, October 4, 2016 by Bohdi

Science
What is the acceleration of a kg object if force of 3 n is applied to it?
Tuesday, October 4, 2016 by Brittney

Earth Science
which two criteria must be met before scientists can use radiocarbon dating? I need serious help dudes lol
Tuesday, October 4, 2016 by Lol

science
A gymnast is performing a routine on the trampoline. At the beginning of each jump, she leaves the trampoline with a vertical velocity of 7.4 m/s upward. What is her vertical acceleration when she is at the apex of each of her jumps?
Monday, October 3, 2016 by jaspreet

science
6.023*x10^21 electrons are present n a given amount of ammonium (NH3).How much amount of hydrogen is required to produce the sample of ammonia
Monday, October 3, 2016 by sandhya

Science, Nature Science
Can you please give me three examples of things that photosynthesize that live in oceans?
Monday, October 3, 2016 by CC

Math
Rita needs to measure out 3.5 gallons of vinegar for a science experiment However, her only measuring tool is a measuring cup that holds 1 cup. How many cups of vinegar does she need? I am confused on this can you please help me?
Monday, October 3, 2016 by Matt

science
Water has a density of 1g/ml. If an object has a densidy of less 1g/ml will sink or float?
Monday, October 3, 2016 by bill w. jean toussaint

Science (Chemistry) (Measurement Uncertainty)
Three students are asked to determine the mass of a coon. They each measure different values for the mass of the coin using a balance. Student A recorded a mass of 63.08g, student B recorded a mass of 63.022g and student C recorded a mass of 63.0328g. If the balance is ...
Monday, October 3, 2016 by Ray

science
Describe how you will prepare 500cm of 1M nacl
Monday, October 3, 2016 by Abigail

Science
what steps are important in the process of creating a scientific theory A) Hypothesizing,observing,and testing. B) Creating a prototype and trouble-shooting. C) Analyzing,Offering an opinion, and evaluating D) Trouble-shooting,hypothesizing,and evaluating. Help Me!! please
Monday, October 3, 2016 by valerie

science
T or f,if false,explain why.volume is measurement of how much matter is in an object
Monday, October 3, 2016 by maslot

Science
Answer with solution, plz. 1. What is the concentration of the solution by volume when dissolved is used 30 grams & the water is 60 grams. 2. How much solvent in grams is present in a solution with a concentration by volume of 40% the solute of content is 60 grams.
Monday, October 3, 2016 by Rachel

science
A man of mass 50kg is walking on a long wooden board of mass 200 kg. The wooden board is initially at rest on a frictionless ice surface. If the man walks with a velocity 1m/s in the positive x direction relative to the wooden board,find the velocity of the board in m/s?
Monday, October 3, 2016 by Divya

Science, Nature Science
Can you give me three examples of things that photosynthesize that live in oceans?
Sunday, October 2, 2016 by CC

Science,
Why don’t bodies of water freeze in the winter, even when ice or snow forms?
Sunday, October 2, 2016 by CC

Science, Nature Science,ence, Nature Science,ence
How does water help us stay cool?
Sunday, October 2, 2016 by CC

Physical science
A piece of metal has a mass 85 cg and a volume of 450L. What is the density g/cm cubed? What would be the mass of 300 cm cubed of this metal? What would be the volume of 200 ounces of this metal?
Sunday, October 2, 2016 by Sandra

physical science
a car travels 50km east in 30 mins. what is the velocity in km/h
Sunday, October 2, 2016 by bob

Science
The resistance is obserbed to be raised by4 times how many times the lenth has to b changed by keeping area constant
Sunday, October 2, 2016 by Electricity

Science
The fastest growing plant on record is the hesperoyucca whipplei suppose a plant of this type grows 2.5 m in 14 days, what is the growth rate in micrometer per second?
Sunday, October 2, 2016 by Marwa

computer science java
write a program in java for a grocery (fruit shop calculate the prize of bananas @ $.89/kg declaring the the prices of all either as instances or class variables.declare the weight of the fruit as local variables
Sunday, October 2, 2016 by makagona makamachi

Science
What is the ph scale used for?
Sunday, October 2, 2016 by Priscilla

science
an incident ray makes an angle of 20 degree with the plane mirror.what would be the measure of angle of reflection?
Sunday, October 2, 2016 by Tanisha sengupta

Science
Calculate the molarity of 10 % HNO3 (w/w) solution if its density is 2.0 g/cc at 25° C.
Sunday, October 2, 2016 by satyam kar

Science, NATS
Consider the following chemical reaction. Molecular hydrogen and carbon dioxide react to form water and methane. H2+CO2-->H2O+CH4 A)Explain why this equation is not balanced and what law of nature does it break in its current form? B) Astronauts from the Earth carry large ...
Saturday, October 1, 2016 by David

Physical science
What is the wavelength of a standing wave in cm, if the separation between two adjacent nodes is 13.7cm?
Saturday, October 1, 2016 by tammy

science
some have more than a 100 some hav none
Saturday, October 1, 2016 by science

Science, Nature Science,
Give 3 examples of nutrients that WE NEED in our bodies that are soluble in water. Give 3 examples of gases that are soluble in water. Could you please help me these questions?
Saturday, October 1, 2016 by CC

Science
a stone mass of 2.5kg is falling a certai height. Find the force of attraction between the earth and the stone. Also find its acceleration
Saturday, October 1, 2016 by Vivek

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 and ...
Friday, September 30, 2016 by jacob

Science
If the frequency of middle-C is 44Hertz, what is the wavelength of the sound in centimeters?
Friday, September 30, 2016 by Tari

science
A displacement vector r in the xy plane is 15m long and directed ...
Friday, September 30, 2016 by Zeshan

Science
From the top of a tall building, a gun is fired. The bullet leaves the gun at a speed of 340 m/s, parallel to the ground. As the drawing shows, the bullet puts a hole in a window of another building and hits the wall that faces the window. (y = 0.44 m, and x = 6.8 m.) Using ...
Thursday, September 29, 2016 by Anonymous

Science
From the top of a tall building, a gun is fired. The bullet leaves the gun at a speed of 340 m/s, parallel to the ground. As the drawing shows, the bullet puts a hole in a window of another building and hits the wall that faces the window. (y = 0.44 m, and x = 6.8 m.) Using ...
Thursday, September 29, 2016 by Anonymous

Science
A piece of wire of resistance R and cut into five equal parts. These parts are then connected in parallel. If the equivalent resistance of this combination is R1 then the ratio of R and R1 is what.
Thursday, September 29, 2016 by Arun

Science
Compounds with high melting points have ___ a. Covalent bonds b. Metallic Bonds c. Ionic bonds*** d. No chemical bonds How could you determine if a sample of gold is pure? Compare the sample's density with that of pure gold.*** Compare the sample's color with that of pure gold...
Thursday, September 29, 2016 by P

Science (check my answers)
1. In plants, sexual reproduction occurs when sperm and egg unite to form a... a. gamete b. gametophyte c. sporophyte d. zygote Is it d?
Thursday, September 29, 2016 by FluttershyK

Physical science
A golfer on a level fairway hits a ball at an angle of 42* to the horizontal that travels 100 yd before striking the ground. He then hits another ball from the same spot with the same speed, but at a different angle. This ball also travels 100 yd. At what angle was the second ...
Thursday, September 29, 2016 by Anonymous

Science
Describe what makes a mineral unique from other substances. This is (my answer) Its not a lot tho :( Answer:A mineral is a natural occurring crystalline. Minerals are naturally occurring. PLS HELP It's worth 4 points.
Thursday, September 29, 2016 by PLS HELP

science
Both carbon dioxide and water are pure substances. How are they similar to each other? A. both substances have a set ratio of atoms that cannot be separated by physical means. B. both substances have a set ratio of atoms that can be separated by physical means. C. both ...
Thursday, September 29, 2016 by ttng

Science
How much energy is needed to raise the temperature of 2.0kg of aluminium by 30oc
Thursday, September 29, 2016 by Anonymous

Science
measure the pressure of (water being) 1000kg/mmm density and 40 kg weight on its base
Thursday, September 29, 2016 by Bikram

science
Iron is obtained by reduction of iron(iii)oxide gas in a blast furnace.calculate the amount of iron(iii)oxide needed to produce 100tonnes of iron.
Thursday, September 29, 2016 by Ibrahim

science
A ball thrown vertically upwards with an initial speed of 24.5m/s.Calculate the greatest height it will stain.
Thursday, September 29, 2016 by Maxwell

computer science
Acarrentalcompanyusesthefollowingtableto​helpcomputerentalfees. TABLE 9.3 Car Type Chevrolet Corvette Pontiac Buick Oldsmobile Cadillac Rate per Day 50.00 85.00 53.00 60.00 60.00 70.00 Rate per Mile 0.27 0.45 0.32 0.32 0.35 0.40 Write a program to calculate car rental ...
Wednesday, September 28, 2016 by kurt

science
if the ball that was thrown to a fried has a mass of 0.15kg and it accelerates at 20m/s, what force did you exert on the ball?
Wednesday, September 28, 2016 by Marilyn

Science
What is the answer for 3g of sugar in 300ml of water
Wednesday, September 28, 2016 by Anonymous

Science
in scientific inquiry what is communicating?
Wednesday, September 28, 2016 by Travis

Science
What would the density of 8 g of the unknown substance from Zarkon be
Wednesday, September 28, 2016 by Jennifer

AGRIC SCIENCE
WHAT IS THE SCIENTIFIC NAME OF CATTLE
Wednesday, September 28, 2016 by APY QUEEN

AGRIC SCIENCE
WHAT IS THE BOTANICAL NAME OF CATTLE
Wednesday, September 28, 2016 by APY QUEEN

maths /science
A body calling from rest has a velocity of 25m/s at given instant. Calculate 1 the distance the body has fallen 2 the time taken
Wednesday, September 28, 2016 by christina

maths/science
A body falls from a position of rest at the top of a tall building and attains a velocity of 63.7m/s just before striking the ground. Calculate the time for the body to fall from the top of the building to the ground
Wednesday, September 28, 2016 by christina

Science , Earth , Waterce , Earth , Waterce
How can I answer this question? Draw an overall conclusion: how does water compare to other substances? Why do you think so? Please help me...
Wednesday, September 28, 2016 by CC

computer science
Acarrentalcompanyusesthefollowingtableto​helpcomputerentalfees. TABLE 9.3 Car Type Chevrolet Corvette Pontiac Buick Oldsmobile Cadillac Rate per Day 50.00 85.00 53.00 60.00 60.00 70.00 Rate per Mile 0.27 0.45 0.32 0.32 0.35 0.40 Write a program to calculate car rental ...
Wednesday, September 28, 2016 by kurt

Science
Which of the following is a good study habit? A - maintaining a positive attitude B - waiting until the last minute to start on an assignment C - listening to the television while studying D - studying when you are tired A. ?
Wednesday, September 28, 2016 by Carla

Evironmental Science
All of the following make up the three major categories of environmental problems except? a. loss of biodiversity. b. overpopulation. c. resource depletion.
Wednesday, September 28, 2016 by Brandy

science
Find the gravitational acceleration if a spaceship at a distance equal to double of earth's radius from the centre of the earth (g on earth is 9.8 m/s^2)
Wednesday, September 28, 2016 by pruthviraj

science
How do I make an acrostic poem for reactants?
Wednesday, September 28, 2016 by emily

science
A force of 5N gives a mass M,an acceleration of 18ms-2qnd a mass m,an acceleration of 24m s-2.what acceleration wouldit give if both the masses were tied together?
Wednesday, September 28, 2016 by arsh

Science
So I have an 89% in my science class and we took a test worth 15 points. I only got 8 correct which is an F. I have 2 A's, a B, and a D as the other grades in the grade book. How will this F affect my grade? I need it to stay a B
Tuesday, September 27, 2016 by Laila

science
Force is exerted to move a body of mass 50kg from 2 m/s to 5m/s over a period of 10 seconds.draw a velocity time graph regarding the same and calculate the value of force.
Tuesday, September 27, 2016 by nafiya

science
A person is travelling in the east direction with a speed of 2 km/hr with respect to the ground. he finds that the wind seems to blow from north. When he doubles his speed, the wind appears to come from north-east direction. determine the velocity of wind.
Tuesday, September 27, 2016 by natasha

science
will the mass of an object ever equal its volume. Give an example of two things that may have the same volume but a different mass?
Tuesday, September 27, 2016 by Anonymous

Science
What is the difference between latitude and longitude
Tuesday, September 27, 2016 by Ugly trump face

science
Draw and label a diagram of a nitrogen atom. It should have 7 protons,7 neutrons, and 7 electrons
Tuesday, September 27, 2016 by Jack

science
If an object has a mass of 56g and a volume of 22cm', will the object float in water? explain your answer.
Tuesday, September 27, 2016 by viv

Science
Mass is measured in grams, accelaration is measured in meters per second squared, and distance is measured in meters. Force is equal to mass times sccelation, and work is equal to force times distance. What is the unit of work?
Tuesday, September 27, 2016 by Jessie R.

Science
I need help finding two examples of natural social systems
Tuesday, September 27, 2016 by Kendra

Science
How do scientist work
Tuesday, September 27, 2016 by Anderson

Science
when a current is passed through water during the process of electrolysis,two gases are formed. One gas has formed has a boiling point of -256 degrees celsius.Has a chemical or physical change occurred? Explain. ok i've already answered just need a few more sentences. This is ...
Tuesday, September 27, 2016 by Senpai onii-chan

science
A body travelled from rest with acceleration 8m/s-2 find its velocity if the distance is 100m
Tuesday, September 27, 2016 by Busayo

Science
Can someone please explain how to do dot and cross diagrams. Thanks
Tuesday, September 27, 2016 by Rebecca

computer science
____________ is an application program included with Windows that allows the contents of the computer, the hierarchy of folders on the computer, and the files and folders in each folder to be viewed.
Tuesday, September 27, 2016 by marry

Science
What propity makes a metal useful in a electical devices
Monday, September 26, 2016 by Kaitlyn

physical science
Find the gravitational force between two 20 kg spheres that are separated by 4.0 m.
Monday, September 26, 2016 by heydi

Science
A substance has melting point of 0 Celius and a boiling point of 100 Celius. The substance is most likely * water * hydrogen * gold * table salt
Monday, September 26, 2016 by Plurp

Physical Science
which of the following is a physical change? * sawing a piece of wood in half * burning a piece of wood * rust forming on an iron fence * a copper roof changing color from red to green.
Monday, September 26, 2016 by Soccer #18

Science (Please help!!)
creating a prototype and troubleshooting are steps in the development of a: a new scientific theory b: a new experiment c: a new scientific law d: a new technology ******* Please help =)
Monday, September 26, 2016 by mia larson

Physics
A science student is riding on a flatcar of a train along a strait, horizontal track at a constant speed of 12.0 m/s. The student throws a ball into the air along a path he judges to make an initial angle 65. deg with the horizontal and to be in line with the track. The ...
Sunday, September 25, 2016 by Mary

Please help do by 10:00 Science
1. Convert 4.0 kilometers (km) to meters (m). (1 point) 0.04 m 40 m 400 m 4,000 m 2. For his science project, Austin wants to determine if the pH of standing rainwater changes over time. He collects a jar of rainwater and places it indoors in a spot that does not receive a lot...
Sunday, September 25, 2016 by BLOB

Science
If a cell membrane is both permeable to salt and water, what will immediately occur?
Sunday, September 25, 2016 by Hayden

Science
The mass of astromout measured on earth in 8500g. What will be his weight on earth
Sunday, September 25, 2016 by Matred

science
what is the focal lenght of an object 10cm in front of a convex mirror having image that is 5cm behind the mirror?
Sunday, September 25, 2016 by Anonymous

science
1. If person weighs 176 lbs on earth what is his or her mass on mars where the force of gravity is 37% of that on earth. With Complete solution
Sunday, September 25, 2016 by sky

Science
a freight train must approach a road crossing at 16km/h. after passing through the intersection, the train speeds up to 65 km/h, taking 10 min to do so. what is the train's acceleration during this time in meters per second squared
Sunday, September 25, 2016 by Nhipham

physical science
How much would a 81.4 kg person weigh on Venus, where the acceleration of gravity is 8.87 m/s2?
Saturday, September 24, 2016 by Natosha

Science
If you have 25 glucose molecules transporting out to 5 glucose molecules how will the molecules need to move to reach equilibrium? Out
Saturday, September 24, 2016 by Hayden

science
what is the difference between the momentum of a 2,500 kg honda moving at 40 m/s and a 2,500 kg honda moving at 15 m/s whats the formula? or answer
Saturday, September 24, 2016 by unknown

Science
A car moves at 20 meters in 2 seconds. What is the momentum of the car if it has a mass of 3,000 kg? A football player runs across the field for a tackle. He has a momentum of 1,120 kg x m/s and is moving down the field at 10 m/s what is the mass of the player? Anything helps ...
Saturday, September 24, 2016 by YOLANDA

Science
How do acidity and surface area affect the weathering of most materials? Can you also provide me with a website to read about this as well. I don't know
Saturday, September 24, 2016 by Matt-Please Help

Science
1. What number on the pH scale is the strongest acid? 2. What number on the pH scale is the strongest base? Can you please help me with this. I am not sure.
Saturday, September 24, 2016 by Matt-Please Help

Science
You can jump 2 feet vertically on Earth. Figure out how high you would be able to jump on the Moon, where acceleration due to gravity is ⅙ that of Earth. Assume you launch upwards with the same speed on the Moon as you do on the Earth." I've already measured how high I ...
Saturday, September 24, 2016 by BunBun

Science
Q1-Who gave the equation (E=MC^2). Q2-Who gave the equation (V=IR). Q3-What was Newton's second law?. Q4-What was Newton's first law?.
Saturday, September 24, 2016 by Varun Dhawan

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