Science

Recent Questions

SCIENCE
Which of the following is equal to the buoyant force of a rock placed in a beaker of water? (1 point) volume of the displaced fluid weight of the displaced fluid volume of the rock weight of the rock

SCIENCE HELP
CAN SOMEONE CHECK THESE!! 1. Which of the following is a reason why a person might want to wear snowshoes if walking a distance in deep snow? (1 point) snowshoes spread the person’s weight out snowshoes reduce the amount of pressure on a given spot snowshoes keep the person ...

science
A family is seated around the fireplace in a mountain cabin on a rainy night. A bright flash of lightning lights up the room and is followed in less than a second by a loud clap of thunder. The light bulb in a floor lamp flickers and goes out, as does the TV SET. Fortunately, ...

SCIENCE PLZZ HELP!!!
Given equal concentrations, which of the following produces the fewest hydronium ions in an aqueous solution? strong acid weak acid strong base weak base This is the only question i need help on and i have no clue what ut is! any help?

science
If removed from the life cycle, which of the following would have the greatest impact on the productivity of lawns? 1. robins 2. moles 3. toadstools 4. dandelions 5. microorganisms need a little help here?! I think my answer would be 5

science
Birds extract more food from a lawn than from an equivalent amount of prairie because 1. lawns contain more moisture than prairies 2. prairies occur at a higher elevation than lawns 3. lawns contain more food than prairies 4. temperatures are higher on lawns than on prairies 5...

science
The major advantage provided by worms to a lawn is? 1. attracting birds 2. protecting moles 3. breaking rocks 4. eating weeds 5. cultivating soil I believe my answer is #5 ?!?!

physical science
Name the intermolecular forces in each of the above mentioned substance and water

physical science
Explain why the surface tension of water is greater than that of methylated spirit?

science
What is the equivalent resistance when resistance of 1ohm and 10raise to 6 ohm are connected in series

Social science
India: ______decimal _____ :architecture

science
Chromium (III) iodate has a Ksp at 25°C of 5.0 x 10–6. 125 mL of a solution contains 0.0050 mol L–1 Cr (III) ion. Possible answers: a. 8.4 x 10–2 mol L–1 b. 2.2 x 10–3 mol L–1 c. 6.3 x 10–2 mol L–1 d. 2.1 x 10–2 mol L–1 What is the molar solubility of ...

SCIENCE HELP PLS
How does using coal to generate electricity affect the environment? (1 point) Using more coal reduces the amount of pollution from using oil. Using coal improves the quality of nearby water. Using coal, instead of wood from trees, helps improve the environment. Using coal ...

Science HELP Please
The following facts are true about Resource A: It grows in nature and takes about five years to reach a mature size. It can be replanted after it is cut down. Resource A is most likely a(n) A inexhaustible resource. B nonrenewable resource. C recycled material. D renewable ...

U.S. History
1. What would this image convey to someone from the early-1900s about about the suffrage movement? (image: "early-1900s women's suffrage painting"-- this has a sign on it that says "official program women's suffrage procession" a person riding a horse and "Washington D.C. ...

science
A bicycle tire is filled with air pressure of 6 atm at a temperature 20 Degrees Celsius. Riding the bicycle on asphalt on a hot day at a temperature 42 degrees Celsius makes the volume of the tire increase by 2%. What is the new pressure in the bicycle tire?

science
Does sodium nitrate turn the phenolphthalein indicator pink ?

Please check my answers for science!
What does a cladogram show? A)comparison of the relative ages of organisms B)evolutionary relationships between organisms C)comparison of species that are most similar D)ecological relationships between organisms*** Which pair below has the most shared derived characteristics...

Maths,Physics,Life Science, Agricultural science
list three factors to consider when choosing subject in grade 10

science
imagine you have two identical globes.what type of connection would cause the total amount of light and heat emitted to,, a.less than the amount emitted by a single globe? b.more than the amount emitted by a single globe?

Science
What would the mass of five grams of salt mixed with twenty grams of water be?

earth science
state the mostly reason for the differences in the weathering rate of the three rock materials

algebra
A survey of 70 Customers was taken at a bookstore regarding the types of books purchased. The survey found that 42 customers purchased mysteries, 34 purchased science fiction, 24 purchased romance novels, 18 purchased mysteries and science fiction, 12 purchased mysteries and ...

science
If a steel-density is 7.8g\cm is put in water, will it float or sink

Physical Science
How much heat is necessary to change 305g of ice at -11c to water at 20c

science
If element X has 85 protons, how many electrons does it have? electrons

science
How many grams of zinc chloride are required to react with 15 grams of aluminum metal to create aluminum chloride and zinc metal?

science
if one person is pushing an object to the right and another person is pushing an object to the right like so: 10 Newtons →(object)← 15 Newtons What is the net force? Are the forces unbalanced or balanced? I think the forces are balanced but I'm not sure what the ...

science
A ray of light travels from Liquid helium (n=1.03) into a second material. You gradually increase the angle of incidence until, at 83.6°, the light no longer passes into the second material. What is the index of refraction of the second material?

science
Gallium crystallizes in a simple cubic lattice. Sketch the unit cell. Determine the number of atoms present in the unit cell. The density of gallium is 5.904g/cm^3. Determine a value for the atomic (metallic) radius of gallium.

earth science
When I bumped the table, the coffee in my cup spilled out. Newton's _____ law explains this reaction. 1st 2nd 3rd

science
a radioisotope, Iodine-131, has a half life of 8.1 days. explain what this means. draw a particle diagram for a sample 12 particles of I-131 initially after 8.1 days and after16.2 days.

science
calculate delta E & delta H when 100dm^2 of helium at S.T.P are heated to 373k in a closed container. assuming that the gas behaves ideally and CV=12.55g/mol

Science
escribe why there are different layers in the atmosphere what are the charecterestics of them which one has the ozone layer which layer is the coldest which is the hottest which one holds the aurora borealis

Science
A man walked 2.5 km in 50 seconds how fast did he go in meters per second?

Science - 6th grade
A skydiver prepares to jump out of a plane. Explain how gravity and air resistance will affect the motion of the skydiver before and after he or she opens the parachute. My response : Gravity will pull the skydiver down to the ground. As they're in the air and go accelerate ...

science
calcium reacts with water to form calcium hydroxide and hydrogen.how many moles of water are required to react with 0.5 mole of calcium?

science
Write about different types of plants?

Science
Solubility of nacl in 100g of water at80degree

science
Assume that some sugar was put into some rice by mistake. Design an experiment to separate the mixture. I'm not sure what I should do, can someone help me out?

Science (Biology)
Use your knowledge of photosynthesis to explain what is happening in the following graphs. 67(dot)media(dot)tumblr(dot)com /d99a0dd856c87dfc21b9314f89019994/tumblr​_o7ltp1unLS1tt1il6o1_1280.jpg

science
14. A car with a mass of 1,200 kilograms is moving around a circular curve at a uniform velocity of 20 meters per second. The centripetal force on the car is 6,000 newtons. What is the radius of the curve?

science
Calculate the equilibrium constant of NH4HS H2S + NH3

Science
name all structures that supply blood to the liver

Science
What develops from the Allantois? (*note the umbilical cord is not an option for this question)

Science
What never asks a question but often answers

Science
When hydrogen is fitted into the reactivity series it comes after what ?

Engineering science n3
a train with a mass of 120Mg accelerates uniformly on a horizontal track. The resistance to movement is 5N per kN mass of the train. The force in the draw bar is 30kN. Calculate: a) The force required for a constant speed b) The force that cause acceleration c)The acceleration

Science
The mitochondrion is responsible for a. producing glucose from sunlight c. converting glucose into usable energy b. burning up old cell parts d. burning usable energy

science(chemistry)
How is ethanol after 1 minutes of evaporation

science
in a compost bin insects bugs,slug,bacteria,fungi,and worms help to ________ biomass?

science
55,000J of work is done to move a rock 25m. How much force was applied?

science
A man shots a rifle with 30.m and hit's an object at 1.90cm. What is the flight time? What is the velocity of the shot? 1.90=.19m

science
Which of the following is the best instrument to use to prepare a solution

science
A geologist working in a national park finds a mineral. He is carrying a kit that contains a penny, a hard lens , a piece of tile a geologic hammer, and a jackknife. Describe how the geologist can use these items to determine some of the minerals characteristics

science
Tom is making the locations of the active volcanoes on a world map. Explain how the locations of the volcanoes are related to earth's plates? please help me im begging you

Science
What effect did the colour filters blue and green have on the red yellow and pink flowers? Explain the reasons for the change in colour

science
What is the % labelling of oleum in which mole fraction of H2SO4 is 0.49?

science(chemistry)
2 mL 1.5 M naoh and 1.5 mL 2 M naoh mixed solution's concentrate=?

Science
Rocks are collections of __________ .

SCIENCE PHYSICS
A Sky-diver(falling vertically)starts from rest at time t=0.His acceleration is non-uniform until be reaches a steady speed of 50m/s at t=10s.He open his parachute at t=20s and decelerates until t=25s.From t=25s he falls at a steady speed of 5m/s.Draw the speed-time graph for ...

science
15g of an unknown hydrocarbon burns in oxygen to give 4,7g of carbon dioxide and 19,35g of water calculate the empirical formula

science
you plan to measure the thermal energy released durning a chemical reaction what tool would you use

Science
Explain the law of motion needed to solve this problem and then solve it. On Planet Zorg a 30 kg barbell can be lifted by only exerting a force of 180 N. What is the acceleration of gravity on Planet Zorg? Predict how the motion of this object would change if on Earth. Is it ...

Science- Boo?
forests and fisheries are an example of what?

science
The equation y=5sin(3x-4)where y is in millimeters x is in metres and t is in seconds,represents a wave motion

science
1. A car slows down from 23 m/s to 14 m/s over a time period of 3 seconds. The car’s mass is 1330 kg. What is the car’s acceleration, momentum, and force.

science
why the surface tension of water is greater tha that of methylated spirit?

Science
If the earth exerts a 500 N gravitational force on an object in near space, how much force does this object exert on the earth, and by what law can this be asserted?

Spanish
What are schools and organizations in silicon valley doing to foster growth for hispanic and latino students? a. Offering math programs in the summer b. Offering english classes year round C.offering tutoring classes in science during the weekends d. offering writing classes ...

Science
Why do earthquakes occur along the San Andreas fault

Germination-Science
Need help filling in the blanks for the following: Topic: Germination The embryo of the seed is made up of the root and the f____ l_____. The first leaf will grow to become the s_____ of the plant. Is there anything wrong with the above statements? Someone told me that "The ...

Science
What is delta U when 2.0mole of liquid water vapourises at 100 degree celcius? The heat of vapourisation, Delta H vap. Of water at 100 degree celcius is 40.66 KJ/Mol

science
Phosphoric acid is very important compound used to make fertilizers.PPhosphoric acid can be prepared in two ways: Reaction 1: P4 + 5O2 = P4O10. Reaction 2: P4O10 + 6H29 = 4H3PO4. Supposing we allow 272 g of phosphorus to react with excess oxygen which forms tetra phosphorus ...

Science
Need help filling in the blanks for the following: Topic: Germination The embryo of the seed is made up of the root and the f____ l_____. The first leaf will grow to become the s_____ of the plant. Is there anything wrong with the above statements? Someone told me that "The ...

science
Suppose you need 2.0 L of 6.0 M sulphuric acid, and you have a bottle of concentrated acid of 18.0 M sulphuric acid. a). How much of this would be needed to a 2 L, 6.0 sulphuric acid solution? a). Describe how you would prepare this solution.

Science HELP
What types of changes does a hurricane cause along the Texas coast? (Weathering, erosion, or deposition)

Science
Suppose the velocity of a car is 10 m/s at t = 0 s, and is 20 m/s at t = 30 s. Which of the following must be true? The car had a positive instantaneous velocity in the interval. The car had a positive instantaneous acceleration at each moment in the interval. The car had a ...

science help pls pls pls
Generally speaking, how does the complexity of Colorado's geology compare with the complexity of Florida's geology? Colorado's geology is more complex than Florida's geology. Florida's geology is more complex than Colorado's geology. The geology in Florida is equally as ...

science
an electric heater draws a current of 10A when connected to a 200 V supply. what current will the heater draw when it is connected to a 220 V supply.

science
which of the following illustrates conduction as a mode of heat transfer 1 point a microwave oven produces electromagnetic waves that transfer to the food in the form of head ** leaving a metal spoon in a bowl of hot soup will make the spoon at a well pasta rises and falls ...

Science
A ring roll down along an inclined plane starting at a height 4m. Find the velocity when it arrives at the base of the plane. (y 2.5m) ?

computer Science
Automata theory and regular expessions prove that (A ∪ B)* = A*(BA*)*.

science
A ladder 5 m long is leaning against a wall. The bottom of the ladder is pulled along the ground at rate 2 cm/s . How fast is its height on wall decreasing when foot of ladder I'd 4 m

science
suppose you need 2.0L of 6.0mol sulfuric acid and you have a bottle of concentrated acid of 18.0mol sulfuric acid. (a) How much of this would be need to a 2L of 6.0mol sulfuric acid solution? (b)Describe how you would prepare this solution?

physical science
John is using a pulley to lift the sail on his sailboat. The sail weighs 150 N, and he must lift it 4.0 m. How much work must be done on the sail?

science
A ball of mass 0.5 kg is released from rest at a height of 30 m. How fast is it going when it hits the ground?

science
A man throw a stone over a cliff and hear it strikes at the bottom after 8.00sec the temperature is 25 celsius. What is the height of the cliff in km.

Science
Luster, Malleable, Ductile, Conductor, Solid at room temperature: Which element could be described by the list of properties above? A) magnesium B) mercury C) neon D) phosphorus***

science
If Faraday hd used a more powerful battery in his experiments with electromagnetic induction, what affect would this have had on his galvanometer's measurements of current when the battery was fully connected? explain your reasoning. Thanks again!

science
Describe how turning off the electric current in an industrial magnet affects its magnetic field. Thanks!

Science
What happens to energy and matter during a chemical reaction?

Science
State the reagents that can be use to prepare the following salt potassium chloride(Kcl)

mathematics, science, accounting
Can a right-angled prism of clear ice be used for total internal reflection of right through 90degrees, bearing in mind that Ice has a critical angle of 48,8degrees?

Science
Historical models of the solar system include: A.Helliocentric,B.nebular,C.Geocentric model or earth centered universe and a _ model or sun centered universe

science
For your discussion assessment, you will present your proposal of a device that minimizes heat transfer.

natural science
we must combine sodium carbonate with which acid to get sodium sulphate?

Physical science
An alpha particle is identical to A) a neutron B) a helium nucleus C) an electron or D) a hydrogen nucleus

science
A gaseous compound containing carbon and hydrogen was analyzed and found to cons ist of between 80 and 90 percent carbon by mass. At 145ºC and 1.00 atm, the density of this compound is 2.45 g/L. What is the molar mass of the compound?

Science
The temperature of a silver bar rises by 10. 0°c when it absorbs 1230 jof energy by heat. The made of the bar is 525 g. Determine the specific heat of silver.

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