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Science

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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?.

SCIENCE
The intensity of solar radiation at the surface of the earth is 1kW/m2 . A roof has a square solar panel of sides 10m that absorbs the radiation completely. What is the average force exerted on the panel?

Science
The binding energy of election is 13.6 v .the loss of mass in formation of h atom is

Science
A 0.5kg mass connected to a light spring of constant 20N/M occilates on a frictionless track. Calculate the total energy of the system

Science
I have a 91 as my average now. I only have two weeks left. What do I need to get and a (93)?

science
How many mole of FeSO4 with one mole of KMnO4 in acidic medium?

science
Compare the costs and benefits of hydropower to that of geothermal power. (Please include two costs and two benefits.)

Maths, science
An open box with square bases is to be made out of a given quantity of cardboard of area Csquare. show that the maximum volume of box is ccube/6√3cubic unit

science
The atomic number of gold is 79 how many neutrons are there in an atom of gold that has atomic mass of 197 amu how you got your answer

science
One proposed project to help restore Louisiana's wetlands is to backfill canals that were built for access to and transportation of oil from the coastal area. why might scientists first want to build and study a model of their proposed project? Help!!

Physical Science/ Chemistry
Which of the following shows the correct order of Family #1 elements from least to most reactive? A) Li, Na, Rb, K B) Li, Na, K, Rb C) Rb, K, Na, Li D) Li, Na, K, Ba

science
How many grams of sodium carbonate,Na2CO3,are required to make a 0,2M solution?

Science am i correct?
What are the 4 ways a blood borne pathogen could enter the body's blood stream? Ingestion Inhalation Absorption Skin to blood contact Injection I choose abc and d am I corrct6?

Science
Which of the following are ways u could contract a blood borne pathogen? Semen.toilet seats.vomit. mucous membrane secretions. Blood to blood. Mosquitos My answer is semen and blood to blood. Am I correct?

Computer science
How does virtual memory work? Thanks.

math
Each test grade in Sara's science class counts for 1/6 of the final grade. The final exam counts for 1/2. Sara's test scores are 72, 84, and 90. Her final exam score is 90. What is Sara's final grade for the class? A) 83 B) 86 C) 87 D) 89

Physics science - forces
A jet plane lands on a runway and decelerate so to rest. What can you say about the direction of the resultant force on the ane as it decelerates? What can yu say about the resultant force acting on the plane as it has come to rest? Many thanks.

computer science
draw a flowchart and write the algorithm for printing the first 10 even numbers

science(physics)
A powerful motorcycle can accelerate from rest to 28m/s in only 4 second . a.what is its average acceleration? b.how far does it travel in that time

Science
If two person sitting on a sea-saw has different weights,how can thay balance the sea-saw

Science
We call zone of saturation the level to which the water fills all the interstices, or the pores, with the ground and all cracks minusclus of the rock/this fresh water supply exists in all the grounds. Why?

Science
what geographical features create natural boundaries for water to flow toward one ocean or another?

science
can someone check my answers? 1) which of the following statement about igneous rocks is correct? A. intrusive igneous rocks are formed when magma is cooled above the ground. b. extrustive igneous rocks are formed when magma is cooled above the ground. c. extrusive igneous ...

Science
1.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 2. Your friend John complains about his poor grades. You go...

Science
A. How could the scenario have been prevented? B. How should the student respond in the scenario to minimize the harm? During an experiment,Carin carefully pours solution A from a test tube into a beaker.Krystal sneaks up behind Carin to wish her a happy birthday.Carin ...

Science
2. Your friend John complains about his poor grades. You go to his house to study one day. The only place John has to study is at the kitchen table. While you are there, his younger brothers run through the kitchen screaming over and over again. What advice would you give ...

Science
Calulations and observations to determine the molarity of given sodium hydroxide solution provided with M/20 oxalic acid solution

Science
1. 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

Math for Ms. Sue
I'm Claire's grandma; a retired teacher of science and supplemental in math. I am stumped on her question about pizza tonight. I'm working via phone with her. Would you mind taking a look at it. I know the answer, but not sure how to explain the results. Please and thanks.

Science
A family is planning to build a raised planting area using a blend of peat moss, mulch, and a rich organic soil in which to grow the plants. they have been told first to place on the ground a layer of material that will allow for a proper drainage each time the plants are ...

Science
In a home's central heating system when the room temperature measured by thermostat reaches a set value, the thermostat sends a message to the heater, and the heater switches off. These actions are an example of: A. a model. B. feedback. C. input. D. A process Is it B?

Science
A group of parts that work together is called. A. Technology B. Process. C. System. D. Feedback I think its C?

Science
You are sitting in a rowboat on a lake, watching waves created by a passing motorboat. If you count 4 crest pass every second, and the crests are 5 feet apart, what is the speed of the water waves?

Physical Science
A man jogs 8 km/h for 5 hours. How far did the man jog?

Science
what is a watershed?

Science
Fill in the blank A minerals _______ is determined by the ability of one mineral to ________ another mineral

Science
A minerals _______ is determined by the ability of one mineral to _________ another mineral

Science
What is the density of steel metal? Please help I don't know the anwser!!!!

Science
Hemlocks are a common type of tree in the northern forests of the United States. In studying one forest, a forester noticed that mature hemlocks were abundant but there were very few young hemlocks. She wondered why there were so few young hemlocks. By reading the records that...

Science
2. Your friend John complains about his poor grades. You go to his house to study one day. The only place John has to study is at the kitchen table. While you are there, his younger brothers run through the kitchen screaming over and over again. What advice would you give ...

science chemistry
balance Redox :- CuS + SO4²- = CuO+SO2

Science
A ball thrown vertically upward and reached to thrower in 6sec what will be velocity and man maximum hight

Science
A train starts from rest and attains a speed of 15 m/s in 10 seconds and produce acceleration of 2.5 m/s (square) it stops in 6 seconds after the breaks apply find the distance covered by train

science
What will be the effect on the colour of blue litmus paper when it is dropped in each of the following solution. 1. Water 2. Lime juice 3. Dilute hydrochloric acid 4. Sodium hydroxide solution.

Science
A compound is made up of two elementsA and B,has A=70%,B=30%.The relative number of moles of Aand B in the compound are 1.25 and 1.88 respectivily.If the molecular mass of the compound is 160g.Find the molecular formula of the compound?

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.

Physical Science
What is the average kinetic energy of a nitrogen molecule, N2 in the air for 100 degrees Fahrenheit?

Science
THANK YOU DRWLS. I just wanted to thank you because you have been a major part of my successes in High school. Your answers are always clear, easy to understand, and most importantly correct! I just wanted to expresses my gratitude as you are truly the MVP of Jiskha. I'am sure...

Science
What is the difference between saltwater and freshwater?

science
I don't know what to do 4 science in my honners class

Math, science,English and social studies
Hi, do you help with homework? Do you help with reading? Paying money?

science
Johnny stacked 200 cans, each weighing 5 N, on shelves 1 meter high in only 100 seconds. How much power did he use for the task?

Science
A rock is held steady over a cliff and dropped. 1.1 seconds later, another rock is thrown straight down at a speed of 12.1 m/s, and hits the first rock. How far have the rocks dropped before they collide? How long is the first rock in the air before it gets hits by the second ...

Science
Is mushroom, desert, temperature, coral, steak, athletes foot, mold, tree, rocks, dirt, gold, plastic, grapes, turnda Biotic, both, or abiotic

Science
10. How can serveying reading material improve your comprehension? (1 point) > Knowing the main ideas ahead of time helps you know where to focus your attention**** > Reciting the answers to questions out loud will help you remember them > Reading your head make ...

biology/science
Oxygen attracts electrons more strongly than hydrogen does. What kind of bond forms between the two hydrogen atoms and single oxygen atom that form a water molecule? A. A metallic bond B. A hydrogen bond C. An ionic bond D. A polar bond Currently stuck here.

science chemistry
balance Redox :- CuS + SO4²- = CuO+SO2

Science
A bus travels first 20 km in 1 hour next 20 km in half an hour and next 20 km in 1 hour

Biology
I would like some help if that is OK, like soon!:) 1.) A group of scientists proposes an idea that a chemical compound will enable bean plants to grow faster. They grow one group of bean plants in the presence of the compound and another group in the absence of the compound. ...

science
A 100 kg cart accelerates from 0 to 20 m/s in 5 seconds. What is the acceleration?

Science
A piece of unknown metal with a mass of 68.6 grams is heated to an initial temperature of 100 Celsius and dropped into 42 grams of water with an initial temperature of 20 Celsius in a calorimeter the final temperature of the system is 52.1 Celsius the specific heat of the ...

Science 7th Grade
How do i solve this. Atomic Theory Date (year) Name of Scientist(s) Contribution to the Theory Source 5th century BC Leucippus and Democritus They proposed that all matter is composed of tiny particles called atoms that can’t be split into smaller pieces and that attach to ...

Physical Science
While rearranging a dorm room, a student does 310 J of work in moving a desk 1.5 m. What was the magnitude of the applied horizontal force?

science
what mass of CO2 can be formed when 14.17g of C4H10 are burned in excess oxygen I do not even know where to start

Computer Science
What is the rule for this function? input 1 output 2 input 2 output 5 Input 3 output 12 Input 4 output 34 Input 5 output 135 Input 6 output 741

Science
A transformer has 60 turns in the primary and 1200 turns in secondary.if the primary voltage is 500 V what will be the secondary voltage be? What will the current be if the primary if the secondary carries 2.0 A

Science
Which of these choices do both sustainable and organic agriculture avoid? A. Artificial hormones B. Pesticides C. USDA certification D. Antibiotics

science
Maximize value Z = 15x + 10y subject to the constraints 3x + 2y ¡Ü ¡Ü 12, 2x + 3y ¡Ü ¡Ü 15, x ¡Ý ¡Ý 0, y ¡Ý ¡Ý 0 is

science
calculate the volume oqupaied by 20gram H2 at NTP

Science
How many grams of CO2 is produced from 855 grams of C6H12O6 in the process of cell respiration?

science
What are the effects of pollution in plants?

Science
A saturated solution of kcl is prepared at 25degree celsius. What would happen if temperature is cooled to 10degree celcius? ????????

Science Chemistry
A saturated solution of kcl is prepared at 25degree celsius. What would happen if temperature is cooled to 10degree celcius?

Science
Please help me. This is the question. A diver weighing 500N is positioned at the right end of a diving board with a length of 4m and negligible weight. The board is bolted down at the left end while being supported 1.5 m away from the fulcrum. a.)Find the forces F1 and F2 that...

Science
You're in a room with two doors one door leads to nothing and the other one leads outside one door always tells the truth and the other always lies you get one question to ask one door what would you ask to figure out which door to take to get outside

Science (7 grade) Help Me
how should i proper for a file study and what should i do if there is an accident??

Science
Create a model which explains the water cy le

Science
A car moved with a speed of 60km/h for 2 hours and then with a speed of 80km/h for the next 1 hour.calculate the total distance covered by the car Answer:60/2=30km/h 80/1=?

Science
How do you round the mass of the plactic cup that is 5 grams

Science
What does lmao mean?

Science
Which phrase best describes a car that has positive acceleration. A. The car is moving slowly. B. The care is slowing down. C. The car is speeding up. D. The car is moving fast. I think its it`s C. But i need help. Please

Science
Please help me with my sciene? Which type of eclipse would you expect to see if the moon passes directly between Earth and the sun? (1 point) a solar eclipse a lunar eclipse a total lunar eclipse a penumbra 2. Which of the following statements about a lunar eclipse is true? (...

Science
Which of the following tools can bd used to measure mass? A) a graduated cylinder B) a triple beam balance C) a mercury thermometer D) a bathroom scale I think its B, thank you for the help!

Science Project topic question
If you are looking into comparing the effects of various oils on pseudomonas aeruginosa, what will you search for aside from the oils you're thinking of testing it on the bacteri and the infection?

science
Wind energy is used in?

Science
A dolphin has 5,200,000 ppm of DDT. Phytoplankton contains 10 ppm. How many times greater is the concentration of DDT in the dolphin. My answer was 520,000 times greater Is my answer correct? Also a

Science
A pulley system having 5 pulleys is used to raise a 450N load. find the mechanical advatange and hence the effort if the efficiency is 75%

Science
Why can'y pyramids of energy never be inverted?

Physical science
flammability is a material’s ability to burn in the presence of? A)hydrogen B)nitrogen C)oxygen D)carbon dioxide I think the answer is A am i right?

Science
What is ecrfenine unscrambled?

science
how much salt must be added to how much water to create 10ml of a 10% saline solution.

Science
in a homes central heating system when the room temperature measured by the thermostat reaches a set value the thermostat sends a message to the heater and the heater switches off These action are an examples of a

Science
The relative age of a rock is... A. It's age based on how much carbon-14 it contains. B. It's age compared with the ages of other rocks. C. Less than the age than of the fossils it contains. D. The number of years since it formed. I think it's D but my friend says I'm wrong...

science
What should be the range for the exponent of [H+] in solutions that are characterized as acidic? A. 0 to -0.07 B. 0 to 0.7 C. 0 to -7 D. 0 to 7

Science
How many grams of sodium bicarbonate (NaHCO3) are needed to make a 0.6M solution?

Science
Which of the following reasons best explains why scientst need a standard measurement system

social science grade 8 138
10 advantages of colanisation and write if the advantage has a negative or positive impact give a reason for your answer

Physical science
A simple lever is used to lift a heavy load. When a 58-N force pushes one end of the lever down 1.1 m the load rises 0.14 m. How much work is done by the 58-N force? What is the gain in potential energy of the load? How does the work done compare to the increased potential ...

earth and science
what continent lies between 20 and 60 degress north lattitude and between 160 and 50 degrees west longtitude

science
Which of the following is the pOH range of gastric acid? A. 1.5 to 3.5 B. 10.5 to 12.5 C. 1.5 to 2.5 D. 6.5 to 7.5

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