Tuesday
January 17, 2017

Homework Help: Science

Branches of Science

Recent Science Questions

science
one mole of an ideal gas is allowed to expand isothermally at 29.3 degree celsius from a volume of 4.0 litres and pressure of 5.0 atm to a volume of 10.0l and pressure of 2.0atm
Wednesday, January 4, 2017 by dennis

science
establisHey relationship between si unit and commercial unit of energy
Wednesday, January 4, 2017 by naved

science
When an object moves on a circular path what is a work done?specify the reason
Wednesday, January 4, 2017 by naved

Science
For a 5 kg rocket and a thrust time of 5 s, what thrust makes the rocket reach a height of 871 m?
Wednesday, January 4, 2017 by M

science
the body system responsible for the exchange of gases between the body and the enviroment is the
Tuesday, January 3, 2017 by kate

Science
Depletion of what has been halted by a ban on the manufacturing of what
Tuesday, January 3, 2017 by Anonymous

science
The Hoover dam is a hydroelectric power plant that converts the energy of falling water into electricity. Which of the following determines the amount of potential energy of the water stored in the reservoir of the dam? Choose all that apply. A.the electric potential energy of...
Monday, January 2, 2017 by Anonymous

science
what is the greatest number of times a hummingbird will flap its wings in 15 seconds.
Monday, January 2, 2017 by akoriana

science
Find the area of triangle whose vertices are A(2,0)B(4,5)C(6,3)in vector method
Monday, January 2, 2017 by sanha

science
Why the solution of aluminium sulphate in water is not clear
Sunday, January 1, 2017 by jerry

science
Why the solution of aluminium sulphate in water is not clear
Sunday, January 1, 2017 by nidhi

physical science
How much heat is absorbed by a 70g iron skillet when its temperature rises from 24oC to 110oC? joules
Sunday, January 1, 2017 by maddie

physical science
A pendulum has 501 J of potential energy at the highest point of its swing. How much kinetic energy will it have at the bottom of its swing? joules
Sunday, January 1, 2017 by maddie

physical science
What is the speed of a bobsled whose distance-time graph indicates that it traveled 107m in 26s?
Sunday, January 1, 2017 by laure

computer, science, java, software
Write a Java program to declare and store numbers from 1 to 10 in a single dimensional array and display the output in the following format. 1 2 3 4 5 6 7 8 9 10
Sunday, January 1, 2017 by sa

computer,science, java
Inorder to motivate the employees, the company has decided to announce the different types of bonus depends up on the employee’s Grade. If the employee belong to Grade A bonus=20% basic Grade B bonus=15% basic Grade C bonus=10% basic Grade D bonus=7% basic ...
Sunday, January 1, 2017 by sa

science
Write a java program using classes and object to read the em[loyee code (Integer), Imployee name (string), Basic salary )double), Category (Character)then calculate the bonus(double)and the total salary(double)eligible for each employ. The output should have the employee code...
Sunday, January 1, 2017 by Hala

science
Explain the purpose of a control in a scientific experiment
Sunday, January 1, 2017 by donald

science
If a scientist wished to to determine the effect of a certain herbicide on wee growth he would include a control in the investigation. Suggest a suitable control in this case.
Sunday, January 1, 2017 by donald

science
Describe how you would investigate effect of ph on enzymes rate. Draw a labelled diagram to show how you carried out the experiment
Sunday, January 1, 2017 by donald

science
An astronauts boots weigh 100N on earth where the acceleration of free fall is 10m/s2. How much will they weigh on Mars where the acceleration of free fall is 4m/s2?
Sunday, January 1, 2017 by watson

science
write balanced equation showing the reaction occurs when lead is added to a solution containing a mixture of aqueous silver nitrate and copper(ii)sulfate
Saturday, December 31, 2016 by saeed mohmoud

science
An astronauts boots weigh 100N on earth where the acceleration of free fall is 10m/s2. How much will they weigh on Mars where the acceleration of free fall is 4m/s2?
Saturday, December 31, 2016 by watson

science
Explain how end product inhibition can control enzyme activity in living cells
Saturday, December 31, 2016 by donald

science
What is the unit for measuring enzyme activity? What is turnover number
Saturday, December 31, 2016 by donald

science
A ray of light is incident at 40 degrees to a plane mirror. What is the angle between the incident and the reflected rays?
Saturday, December 31, 2016 by favour

science
if there was a source of pollution in Smithtown bay, what role could a physical oceanographer play in understanding the impacts to other parts of long island sound?
Friday, December 30, 2016 by nicole

maths and science
A block of wood of volume 25 cm floats in water with 20 cm of its volume immersed calculate it's density and weight
Thursday, December 29, 2016 by Mahendra Singh

science
w YoState, most of the surface bedrock was formed as a result of which process? a. deposition of sediments into a vast of sea. b, folding of non sedimentary rock. c. metamorphism of sedimentary rock. d. intrusion of magma into sedimentary rock.
Thursday, December 29, 2016 by Anonymous

science
a mushroom absorbs food through its
Thursday, December 29, 2016 by pleaseandthankyou2

science
At what temperature do hydrdogen molecule have the same rms speed as nitrogen molecule at 455 degree celsius
Thursday, December 29, 2016 by ekroxi

Science
What will be the final temp of the ice of 20g when it is heated to 1600 Cal
Thursday, December 29, 2016 by Anonymous

science
A ball of mass 100 gm is thrown vertically at a speed of 10 m/s . find its kinetic energy
Thursday, December 29, 2016 by doli devi

Science
if two spheres,having a weight of 10kg each at a distance of 50 cm find the gravitational force between them
Wednesday, December 28, 2016 by Punit

Science
Mass of ice is 0.015 kg and that of water is 0.05 kg. Both are at 0°C. Find the final mass of ice and water.
Wednesday, December 28, 2016 by Debarati

Science
D)The blood of the vessels near the small intestine is often acidic after a meal. suggest a reason for this.
Wednesday, December 28, 2016 by sophie

Computer Science
C program to find given string has alphabets, digits and special characters in it
Wednesday, December 28, 2016 by *Nick Callahan*

Computer Science
C program to find given string has alphabets, digits or special characters in it.
Wednesday, December 28, 2016 by *Nick Callahan*

Science
Determine the pH of a 0.62M NH4NO3 solution at 25oC. The Kb for NH3 is 1.76x10-5. Calculate Ka
Wednesday, December 28, 2016 by Manushi

Biology science
What is the nature of the phloem vessels after they are stained in the microscopic sections
Tuesday, December 27, 2016 by Ibrahim

Science
Identify the nature of the walls of the phloem vessels after they are stained in the microscopic sections
Tuesday, December 27, 2016 by Ibrahim

Science
Determine the pH of a 0.62M NH4NO3 solution at 25oC. The Kb for NH3 is 1.76x10-5. Calculate Ka
Tuesday, December 27, 2016 by Manushi

Engineering science
A man throw a ball upward with velocity of 30m/s.1.5 seconds he throw anothe wih the same velocity. Identify at what high will te ball pass one another?
Tuesday, December 27, 2016 by Shah

Applied Science Chemistry
A 0.5g mixture of Cu and CuO was treated with hydrogen at elevated temperature. CuO was reduced to Cu. Q1.) write a balanced equation for the reaction Q2.) before the experment, calculate the minimum amount in mole of hydrogen required to ensure the reduction is completed
Monday, December 26, 2016 by Darth Chan

science
if yourweight is 60N on earth,how far should you go from the center of the earth so that your weight will be 300N
Monday, December 26, 2016 by kashi dhakal

Science (physics)
The driver of a car travelling along a straight road with a speed of 72km/hour observe a signboard which give a speed limit to be 54 km/hour. The sign board is 70m ahead when the driver applies the break calculate the acceleration of the car which will cause the car to pass ...
Friday, December 23, 2016 by Garima

Physical Science
Sodium (Na) reacts with chlorine gas (Cl2) to form sodium chloride (NaCl) as shown in the equation 2Na+Cl2=2nacl If 4 moles of sodium react, how many moles of chlorine gas will react? I have no idea what to do.......... I need some assistance thanks
Thursday, December 22, 2016 by Jam

science
no. of mole in 4.4 g Co2 is …â€&brvba​r;… .
Thursday, December 22, 2016 by Shivam

Science: Physics
We use an electric immersion heater to heat 2,0 liters water having temperature of 20ï‚°C to the boiling point. Specific heat capacity of water is 4,19 kJ/(kg c). The power of the heater is 1,50 kW and efficiency of heating is 80 %. How much time does the heating...
Thursday, December 22, 2016 by karem

Science: Physics
An electric heater of power 2500 W is connected to a voltage of 230 V. i) Calculate the electric current going through the heater. ii) What is the resistance of the heater? iii) How much energy does it consume in a year, if it is switched on 15 min every day. iv) How much it ...
Thursday, December 22, 2016 by karem

Science Chemistry
Phosphorous (P) is an indispensable nutrient in food production. According to the estimates, mineral phosphorous resources will end up within 50 years and consequently new sources of P has to be found. A human excretes 2,2 g of phosphorous (P) per day on average. In ...
Thursday, December 22, 2016 by karem

Science Chemistry
according to the reaction below: 4 NO + 3 O2 + 2 H2O → 4 HNO3 a) 0,001 g of NO dissolves into 1 liter of rainwater and all of it transforms into nitric acid. What is the molar concentration of nitric acid in the rainwater? b) Supposing that no other acids are...
Thursday, December 22, 2016 by karem

Science Chemistry
The elementary analysis of 22 g hydrocarbon sample results in 18 g C and 4 g H. a) Choose the correct chemical formula of the hydrocarbon: i) CH4 ii) C2H4 iii) C3H8 b) What is the amount of CO2 in grams formed by the total combustion of hydrocarbon? Assume complete combustion...
Thursday, December 22, 2016 by karem

Science
A driver of a moving car at 20m/s finds a child on the road 50m ahead and stops the car 10m earlier to the child. If the mass of the car with driver is 1000kg, calculate the force exerted by the brakes of the car??
Wednesday, December 21, 2016 by Har!@#$%^&h

Science
Our electricity bills consist of many different forms of energy use. In order to be able to make estimates on how much different appliances use electricity and how much savings could be done by investing less electricity consuming ones, you need to have understanding on ...
Wednesday, December 21, 2016 by karem

Science
b) Two families Mäkinen* and Nieminen* travel by cars a distance of 185 km. In the middle of the travel both have a break of 20 min. During driving family Nieminen has an average speed of 90 km/h. Family Mäkinen drives the first part at an average...
Wednesday, December 21, 2016 by karem

Science
Energy management has become a crucial field in increasing the efficiency of our everyday use of energy. One of the most energy consuming activities is the boiling of water. In order to understand the energy consumption, you need to have understanding on thermodynamics and ...
Wednesday, December 21, 2016 by karem

Science
Traffic in the cities releases NOx gases into the atmosphere (in the form of NO and NO2). NOx gases contribute to rainwater acidification by dissolving and transforming into a strong acid (HNO3, nitric acid) according to the reaction below: 4 NO + 3 O2 + 2 H2O â†&#...
Wednesday, December 21, 2016 by karem

Science
10. ALTERNATIVE B The elementary analysis of 22 g hydrocarbon sample results in 18 g C and 4 g H. a) Choose the correct chemical formula of the hydrocarbon: i) CH4 ii) C2H4 iii) C3H8 b) What is the amount of CO2 in grams formed by the total combustion of hydrocarbon? Assume ...
Wednesday, December 21, 2016 by karem

Science
Phosphorous (P) is an indispensable nutrient in food production. According to the estimates, mineral phosphorous resources will end up within 50 years and consequently new sources of P has to be found. A human excretes 2,2 g of phosphorous (P) per day on average. In ...
Wednesday, December 21, 2016 by karem

science
In me is me In me is a twin Which is said to flee When slumber comes in
Tuesday, December 20, 2016 by Anonymous

science
A ray of light travelling in air strikes water by making angle 30 calculate angle of reflection if refractive index of glass is 1.5
Tuesday, December 20, 2016 by Divyanshi

Science
May someone please review my last to science parts and let me know what is right and wrong
Monday, December 19, 2016 by Reeces

Science
This is part two of my science I answered the other one just need to be checked on this one and the other one. 10. _________ is the most plentiful fossil fuel in the United States A:Natural Gas B:Coal C:Oil D:Petroleum 11. What is the result of fossil fuels being used more ...
Monday, December 19, 2016 by Reeces

Science
A+force+of+12+N+pulls+a+block+of+mass+3.​5kg+through+a+rope+of+mass+0.5kg.+The+bl​ock+is+resting+on+a+horizontal+frictionl​ess+surface.+what+is+the+force+of+reacti​on+exerted+by+the+block+on+the+rope
Monday, December 19, 2016 by Shantanu

Science - physics
If you had to send your laser around a wide corner, which type of mirror could help? Briefly explain how it may help I think this one is a concave mirror
Monday, December 19, 2016 by Kathy

Science - physics
If you had to send your laser around a sharp corner, which type of mirror could hel Briefly explain how it may help. I think it is a convex mirror.
Monday, December 19, 2016 by Kathy

physics (science)
A body travels from rest with acceleration 8m/s square . Find its velocity when it has covered a distance of 100m
Monday, December 19, 2016 by Emmanuella

Physical science
If you use a 29m second-class lever to lift a 1000 N load exactly in the middle of the lever, and you lift the lever 1.5m high, how high do you lift the load?
Sunday, December 18, 2016 by Ainsley

Science
5. Name two ways in which a large cell can minimize the negative effects of its size. -They can minimize their size by cell division. -???????? I cannot find this answer in my textbook. Can someone please help me?
Sunday, December 18, 2016 by Olivia N J

physical science
The gas in a cylinder has a volume of 3 liters at a pressure of 106 kPa. The pressure of the gas is increased to 208 kPa. Assuming the temperature remains constant, what would the new volume be? = ....L?
Sunday, December 18, 2016 by laure

science
Describe how the kinetic energy of the molecules affects an object's total thermal energy.
Sunday, December 18, 2016 by Jenny

Computer Science
When is software described as open source
Saturday, December 17, 2016 by Efa

physical science
If the mass of a material is 99 grams and the volume of the material is 22 cm3, what would the density of the material be? (in g/cm3) i don't know how to find the answer.
Friday, December 16, 2016 by laure

Science
Write a short essay in which you create an analogy to describe particle motion. Compare the movements and positions of people dancing with the motions of water molecules in liquid water and in water vapor.
Friday, December 16, 2016 by Brendan

Science
1.Which of these is an example of a biomass fuel? A:Oil B:Natural Gas C:Wood D:Coal 2.The intense heat from Earth's interior that warms the magma beneath the Earth's surface is called __________ energy? A:Hydroelectric B:Geothermal C:Nuclear D:Solar 3.Selective cutting...
Friday, December 16, 2016 by Reeces

HELP SCIENCE
Luis created a clay model of earth and the sun to show how earth rotates, Luis wants to use a toothpick to represent earths axis of rotation Where should he put the toothpick A - horizontally through earth in the direction earth is traveling B - vertically through the center ...
Thursday, December 15, 2016 by Unicorn

science
i just some science questions but there not for school. 1. five volcanic eruptions and what are the locations of these eruptions. Did they occur in the middle of a plate or near a plate boundary? What were the effects of these eruptions on the surrounding environment?
Thursday, December 15, 2016 by please help

science
i just some science questions but there not for school. 1. five volcanic eruptions and what are the locations of these eruptions. Did they occur in the middle of a plate or near a plate boundary? What were the effects of these eruptions on the surrounding environment?
Thursday, December 15, 2016 by avery

Science
What do bone marrow and epidermis have in common. A.they are both sites of new cell information B.they both contain structures that assist the body in cooling down if overheating occurs. C.they both contain or are associated with sensory neorons D.they are both involved in ...
Thursday, December 15, 2016 by Anonymous

science
If your rock sample has 10 grams, how many grams of quartz does it contain
Thursday, December 15, 2016 by hunter

9th grade physical science
I'm really confused on how to do this, Can someone help walk me through? An object is placed in front of a concave mirror as shown in the diagram below. A. Draw at least two rays that demonstrate how this mirror produces an image. (4 points) Image B. Describe the image ...
Thursday, December 15, 2016 by Mailbox-Kun

Maths science his french
Critical angle of a material to air is 30 degree then the refractive index of material will be
Thursday, December 15, 2016 by Manasi

Science
How much energy is needed to convert 10kg of ice at -15 degrees centigrade to 125 degrees centigrade of steam? Express your answer in joules.
Thursday, December 15, 2016 by Paeng

science
what fabric is a good heat conductor? or what material other than metals are good heat conductors?
Wednesday, December 14, 2016 by boo

Science
How much energy is needed to convert 10kg of ice at -15 degrees centigrade to 125 degrees centigrade of steam? Express your answer in joules.
Wednesday, December 14, 2016 by Paeng

Science
What net force is required to accelerate a roller coaster car that has a mass of 300 kg at Disney world at a rate of 8 m/s2 ?
Wednesday, December 14, 2016 by Stephanie

Science
How much you would weigh on the moon if you are 72 pounds on Earth
Wednesday, December 14, 2016 by Anonymous

Science
Every year Eli and his family visit Great sand dunes desert in Colorado. Elliott notices that more dunes with varied shapes and sizes appear each year. Explain what causes this phenomenon. Help! I know that the wind is always different and that causes erosion.
Wednesday, December 14, 2016 by NOYB

science
How do scientists explain the fact that some landforms that are far apart and separated by oceans appear to be related?
Wednesday, December 14, 2016 by bill

Science
Carla applied a force of 35 N to a wheelbarrow full of bricks and moved it 2.5 m. Which of the following can be determined from this information? The wheelbarrow supplied 87.5 J of work. The wheelbarrow has a mechanical advantage of 14. The wheelbarrow is 7 percent efficient. ...
Wednesday, December 14, 2016 by Science question, please don't give direct answer.

science
what is the specific heat of aluminum if temperature of a 28.4g sample of aluminum is increased by 8.1 c° when 207J og heat is added
Wednesday, December 14, 2016 by mohammed

Science
Each heating element has a resistance of 5 Ω. The current passing through each element is 0.4. Calculate the total resistance of the six heating elements.
Wednesday, December 14, 2016 by Jen

science
53.94 g of a substance of molecular mass 182 is dissolved in 1000g of water at this temperature.the vapour presser of water is 17.5 mmhg .calculate the vapour presser of this dilute solution
Wednesday, December 14, 2016 by calculate the vapour presser of dilute solution

Science 6
In an island ecosystem, Fox and Skunks both hunt mice and toads. Which of the following correctly describes some of these relationships? A:Skunks and mice have a competitive relationship. B:Skunks and toads have a predator-prey relationship. C:Fox and Skunks have a predator-...
Wednesday, December 14, 2016 by Evie

Science
1.which of the following species contains a similar oxidation state as in C of CH2O? CO32- , SO32- CO ,N2O,NO2_
Wednesday, December 14, 2016 by Hari

Science
Which of the following could be true of two different species that have a competitive relationship in the same ecosystem? A: one species preys on the other B:they share the same niche C:one species benefits while the other is neither helped or harmed
Wednesday, December 14, 2016 by Evie

science connexus
1.How is kudzu an environmental issue for Georgia A.kudzu can be easily removed B.kudzu can help other plants grow C.kudzu can be used to make medicine D.kudzu can destroy native forest habitats ***** 2.forest and fisheries are an example of A. abiotic factors B.energy factors...
Wednesday, December 14, 2016 by dude

Science
What acceleration does a 40 slug object acquired when 500 lbs force act on it
Tuesday, December 13, 2016 by Sggim

Science 8 A
5. Which of the following types of pollution cannot be attributed to car and truck emissions? A. Acid rain B. Sedimentation C. Ozone D. Photochemical smog I think it is Ozone.
Tuesday, December 13, 2016 by Joshua Gaspie

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