# Science

## Recent Questions

math
Jorge has prepared his science project on a piece of poster board that has an area represented by the trinomial x2 + 5x – 50. a) What are the dimensions of the board? b) Write an expression for the perimeter of the board. c) What is the actual perimeter of the board if x = ...

English
Social studies is fun/difficult/easy/interesting/exciting.​ Math Is _________. Science is _________. -------------------------------- Other than the adjectives above, what other adjectives can we use for the blank? Can you name suitable adjectives?

science
When the ray of light travels from air to glass slab and strikes the surface of separation at 90 degree , then it ..........

science
A balloon filled with 3.5 L of helium at 20 °C and 3 atm. What will be the new pressure if its volume increases to 17.5 L at constant temperature?

science
How can geothermal energy affect the use of fossil fuels?

Science
A car is traveling north at 15 m/s ten minutes later it is traveling at 70 m/s what is the car s initial velocity what is its acceleration

science computer
Write a program to read the names and age of 10 people and print the name of the oldest person.assume that there are no person of the same age.data is supplied in the following form:name,age,name,age

Science Experiment Help
Just need help answering this one question for my science experiment: "Name another mixture that could be separated like the sugar-water mixture." the sugar-water turned into caramel when I heated it... so what other mixtures do that? Thnx for the help! Aly

science
If I mix 300g of reactant A with 100g of reactant B in a close system how much will it weigh

Science
How many Btu's are required to change five pounds of ice at 20°F to water at 160°F? a. 2,608 Btu’s b. 1,390 Btu’s c. 1,304 Btu’s d. 141 Btu’s I am trying ((160-20)x.5)x5 but not getting any of the possible choices. What am I missing? Thanks for the help, Chris

SCIENCE
At 500K,1.00mol of ONCl is introduced into 2.50dm3 closed vessel.At equilibrium the ONCl is 6.5%dissoiated.What is the value of the Kc for equilibrium at 500K

computer science
Write a java program that reads from the user the course code, section and the scores of a student for three exams representing two midterms and a final. The percentage of each of the three exams is of fixed value 30, 30 and 40 percent respectively. Your program computes the ...

Science
Volume of 12M HCL taken for preparing 1M HCL (100 ml Sol {

Science
chemical equation for sodium hydrogen carbonate and acetic acid (not balanced)

science
initial condition V1= P1= formula

science
A ball from a height 'h' on a horizontal floor.If it loses 60% of its energy on hitting the floor then height upto which it will rise after first rebounce is?

Science
A ball thrown vertically upward has a speed of 5.0 m/s at a height of 3.0m. The mass of the ball is 1.2 kg. Find its mechanical energy

Science
When an object and screen are separate d by 1m distance. when a convex lens is place d at 30 cm from the object it forms a clear image then the image distance is?

Science ap chem
For which of the following solutions must we consider the ionization of water when calculating the pH or pOH? (a) 3 × 10−8 M HNO3 (b) 0.10 g HCl in 1.0 L of solution (c) 0.00080 g NaOH in 0.50 L of solution (d) 1 × 10−7 M Ca(OH)2 (e) 0.0245 M KNO3

Science
The pH of a 0.10-M solution of caffeine is 11.16. Determine Kb for caffeine from these data: C8H10N4O2(aq)+H2O(l) ⇌ C8H10N4O2H+(aq)+OH−(aq)

Science
2.Why are biologists concerned about ecosystem disruption? 1.Explain the process of succession. Succession is a natural change in the area that results in one group of plants replacing a group before. for #1 that is all I have so if you could give me a website that would be ...

Science
water is a(n) factor in all ecosystems that all living things requires?

Science
1.Explain the process of succession. 2.Describe how changes in an ecosystem can affect organisms that live there. 3.Describe the amount of time needed for ecosystem recovery If anyone would help me that would be great, websites, answers, anything at all.

political science
Before President Obama, when was the last time a Senator successfully ran for President? A.1824 B.1960 C.Obama was the first Senator to ever win D.1910

Science
1.Explain the process of succession. 2.Describe how changes in an ecosystem can affect organisms that live there. 3.Describe the amount of time needed for ecosystem recovery

political science
I have no clue on this one!!!! Bill Clinton's focus on domestic issues, what was NOT part of his "E2M2" campaign? A.Medicare B.Economy C.Education D.Energy

political science
the Presidential Campaign has three phases. What is the second phase? A.General Election B.Declaring Candidacy C.Party Conventions D. Nominating Process

political science
In the "Campaigns and Elections By the Numbers" box, the book lists the number of people that filed to run for President. It says 167 filed as Republicans, 83 filed as Democrats, and 1 filed under the _______ Party. A.Libertarian B.Green C.Jedi D.Vulcan

math and science
1500kg motor car was travelling at 36m\s comes to rest over a distance of 40m.calculate. {a}retardation. {b}an average force that brings the car to rest

Science
What are the main parts of the prefrontal cortex?

Math and science
a rock has a mass of 3000 grams what is the mass in kilograms that's the question we need to know how to be converted or figure this question out in the layman's term

Science
1. Which of the following illustrates mechanical weathering? A.Carbonic acid weathers marble and limestone. B. As plants grow, they produce weak acids that slowly dissolve rock** C. Oxidation causes weathering in rock D. Repeated freezing and thawing in rocks causes weathering...

science
If a sheet of Tarpaulin (350gsm) 5m high 7m wide at a pitch of 45% with wind speed of 60mph what will be the upwards force (lift force)in Kg?

Physical science
What are photons

Science: Chemical Bonds
Two nonmetals from group 16 are likely to form a: triple and ionic bond double and ionic bond triple and covalent bond double and covalent bond I don't get this, could someone please explain?

Science HELP!!!!
1.To study a rock sample, geologists observe the rock's mineral, composition, color, and temperature. true false*** 2.finds a rock with layers and smaller pieces of other rocks embedded in it. the rock is most likely A igneous B sedimentary*** C metamorphic D chemical 3. ...

Science
Copper plate is used as cathode but it cann't be used as anode during electrolysis of water, why?

Science
Copper plate is used as cathode but it isn't used as an anode, why?

Science
What wave property is labeled X? a. Frequency b. amplitude c. wavelength d. wave speed Is it C? Thank you!

science
usefullness of volume in the 21st centuary

Science
what volume will 5.00g of nitrous oxide gas occupy at 50 degree celcius and 4.00L?

math111
in a science class,65 student study physics while 40 study chemistry.if there are 93 student in the class,how many student study both physics and chemistry?

Science
If a cheetah runs 50 miles in 5 minutes how fast is it running?

science

science
what is partially hydrogenated soybean oil and how is it made

science
what is the number of cycles an oscillator completes in one second is known? what is a force that always acts to pull a system back toward its equilibrium position? what is the distance from one point on a wave to the same point in the next cycle of the wave called? what is ...

Science chemistry
An excces of sulfur dioxide was reacted with 0.150 g of oxigen gas. A mass of 0.725 g of sulfur trioxide was recovered

Science
Hi. Could you Please check my answers? I just want to make sure they are correct. Thanks for the help in advance :). True or false: All matter on Earth contains energy- true? True or false: the molecules in frozen water are in motion- true? True or false: ice is too cold to ...

science
what is isotopes

Science
if a car travels once around a 100-meter racetrack what is its displacement

Science
1. The streams and smaller rivers that feed into a main river are its A. watersheds B. tributaries** C. divides D. reservoirs 2. How are seamounts like the Rockies? A. Both are forms of mountains** B. Both are made of the same kind of rock C. Both are connected to the ocean’...

Science. (I'm patient, no rush)
Which of the following sets of words can be used to describe the outputs of photosynthesis? A. water, glucose, light energy B. Carbon dioxide, glucose, chemical energy C. oxygen, glucose, chemical energy D. glucose, oxygen, light energy*** Am I correct?

science
Three charges, +2.5 micro coulomb, -4 micro coulomb and 6.3 micro coulomb, are located at (0.20m, .15m), (.50m, -.35m), and (-.42m,-.32m) respectively. What is the electric field at the origin?

Science
Is Gc (32.2 lbmft/lbfs^2) equal to gravity? I think it is, but I'm kinda confused about the whole concept. Could someone explain it to me? Thank you very much.

science
Atomic mass of Sodium atom

Science
Ca = 0.75 , Cb = 0.735, and Ka = 7.87044 × 10 6 volume of acid is 100 mL. What is the volume of base at the equiva- lence point of this titration?

Science
Estimate the pH of a solution containing 0.5 L of 0.4 M HClO4 and 0.5 L of 0.2 M NaOH without using a calculator.

science
Metal obtained by chemical reduction is it iron or aluminium?

Science Help
1. Over which interval is the velocity greatest? FILL IN THE BLANK ____ 2. Over which interval(s) is the velocity zero? FILL IN THE BLANK ____ 4. What is the average velocity in m/s from A to B? FILL IN THE BLANK ____ 5. The velocity of an object goes from 4 m/s to 12 m/s in ...

Social studies
Advances in science from the Scientific Revolution were applied to human affairs during the ____________. A. Industrial Revolution. B. French Revolution. C. Enlightenment. (MY ANSWER) D. Age of exploration.

Science
Multiplying Rabbits Suppose that a pair of rabbits produces six offsrping: 3 males and 3 females. Assumes that no offspring die. 1. If each pair of rabbits breeds only once, how many offspring would be produced each year for 5 generations? 2. Construct a graph of your data. ...

Science
Which abiotic factor is essential to all aquatic ecosystems excpet the ocean hydrothermal vents, and why? a. phytoplankton, because it provides a source of food b. salt, because it provides the necessary environment for organisms to move about c. deep water, because it ...

More Science
5. What is the major difference between ectotherms and endotherms? A, Whether or not the animal builds a nest on land. B, whether or not the animal has been found on several continents C, whether or not the animal maintains a constant body temperature*** D, whether or not the ...

Science
1. Which of the following characteristics of the Arctic rabbit is specifically an adaption living in the tundra? A. small size B. keen eyesight C. strong legs D. white fur*** Am I correct?

science
A car initially moves along a straight road at 50 km/hr, and then turns around to travel at 80 km/hr in the opposite direction. What is the car’s change of velocity?

science
1) Which law of chemical combination is illustrated by the fact that 168g fe reacts with 72g H2O to form 232g fe3O4 n 8gH2

I'm not sure what's the correct answer: 9)Which of these characteristics can only be attributed to a wave of red light? A)The energy of the wave travels in the same direction as the wave travels. B)The wave travels by vibrating the particles of the medium at a high rate. C)The...

science
the oxide of which one of the following shows acidic properties?

Science
The trees leaves make a kind of cover that cover over the other plants in the rain forest. What is this part of the rainforest called?

Science
Are air masses that form over land moist

science
Why is photosynthesis an example of a chemical reaction, and why is it classified as endothermic?

science
A machine raises a load of 600N through a height of 1.5m when an effort of 100N moves a total distance of 20m.(a) calculate the work done in raising the load.(b) what is the mechanical advantage of the machine?(c) calculate the efficiency of the machine.

English
I thought it was C for this Victor Frankenstein recounts the influences that lead to his great experiment: I feel exquisite pleasure in dwelling on the recollections of childhood, before misfortune had tainted my mind and changed its bright visions of extensive usefulness ...

science fair
will a heavy metal spring launch a baseball 7 feet in the air with 5 pounds of preasure

Science
When two hydrogen atoms bond with one oxygen atom to form water, what happens to the electrons? A. Each hydrogen atom donates its electron to the oxygen atom. B. The oxygen atom donates an electron to ach hydrogen atom. C. A pair of electrons is shared at each of the hydrogen-...

Science
Name each compound by ionic, hydrogen, or molecular compound and name the following? Im stuck on these! help please!! 1- Al2S3 2- SrI2 3 - CL2O5 4 - FeCl2 5 - BeH2

life orientation
Identity three courses or study field associated with science and give 2 reasons for each

science
Gold(at weight 197gmol-1) crystallizes in a cubic closest packed structures ( the face centred cubic ) and its density is 19.3 gcm-3 .calculate its atomic radius.?

life science
A suitable aim for investigation 1 to test glocose

Science
What is the balanced chemical equation for "solid calcium hydrogen carbonate reacts with hydrochloric acid solution producing carbon dioxide,water and calcium ions in solution?"

math
Here is bob's test score math 65 arts 86 science 84 social studies 78 if his average score is 80 ,how many marks did he make in gramma

geography, history, life science and maths literacy
what courses can I do at university( NWU )

Social science
According to Justice William O. Douglas, where can zones of privacy (the right to privacy) be found in the Constitution? Question 2 options: throughout the Constitution in the penumbras of the Bill of Rights in the First Amendment in the writings of the Founders I think it's ...

Social science
The Second Amendment continues to be a controversial issue. One of the main questions is whether it was meant as a _______ freedom or _______ freedom. Question 4 options: individual; group absolute; conditional temporary; permanent good; bad

political science
The Lilly Ledbetter Fair Pay Act was passed by President Obama in 2007 in order to address what issue?

political science
The former Soviet Union cannot be considered a democracy because A. it did not regularly hold elections B. it permitted no acts of conventional participation C. it had no legislature D. there was only one political party

political science
Which of the following conditions was NOT a part of the Lemon Test, as established by the Supreme Court? A. They must not entangle the government exclusively with religion B. The primary effect must not be to advance or inhibit religion C. There must be a secular purpose D. ...

political science
According to Justice William O. Douglas, where can zones of privacy (the right to privacy) be found in the Constitution? A. throughout the Constitution B. in the penumbras of the Bill of Rights C. in the First Amendment D. in the writings of the Founders

science
How can we measure the Gravitational field intensity of any place on earth ?

science-math
A pharmacist has an 18% alcohol solution. How much of this solution and how much water must be mixed together to make 10 liters of a 12% alcohol solution?

science
Calculate the wavelength of a wave of frequency 40 MHz propagating in a medium Speed of light-(3*10to the power 5. )

Science
What is the charge on 500 mg of electron?

Science
How does lustre affect the amount of heat being absorbed by a black can

science
A example of negative feedback a. elevated free t4 resulting in elevated trh b. elevated free T4 resulting in elevated tsh c low free T4 resulting in elevated tsh d. low free t4 resulting in low tsh i think its B. not sure.

Science
What caused the ten years war

Physical science
A 11-kg box is dragged across a frictionless surface by a force F=55N. the box travels 4.0ft. what is the work done by the applied force F and the work done by the normal force?

Science Problem Plz Help
A charge q1=7.00 x 10^-6 is placed 0.300m from a second charge q2=-5x10^-6 C. Find the magnitude the force between the two charges.

Science
When two hydrogen atoms bond with one oxygen atom to form water, what happens to the electrons? A. Each hydrogen atom donates its electron to the oxygen atom. B. The oxygen atom donates an electron to ach hydrogen atom. C. A pair of electrons is shared at each of the hydrogen-...

snowmobiles/science
What other things would be used to make a snowmobile accelerate?

Science
Does the tilt of the earth cause one hemisphere to be closer to the sun? True or false False.