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Science

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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.

Science
1. Massive amounts of destructive energy are released when a nuclear fission bomb explodes. Where does that energy come from? a) A chain reaction occurs when uranium atoms split, releasing nuclear energy. b) Molecules break down, releasing chemical energy. c) Hydrogen atoms ...

Science (chemistry)
If 1mile of methane(CH4) is releases 890 kJ/mole, how much energy is released per gram of methane?

science
1 evaluate the market failure in south Africa 2 base your argument on south african context and also outline its effects thereof 3 evaluate at least four types of market failure and also how the government should correct the market failure 4 use appropriate examples, pictures ...

science
a body is thrown upward with velocity v . the height at which P.E is one third of K.E is ? answer is in terms of v

Science
If too much of an unsaturated fat is added to bromine water, could this affect decolourisation of bromine water? All help is appreciated... > C >

Science
The moon is about 384000 km the earth and its paths around earth is circular. The moon taken 24hr to complete one orbit. The speed at which the moon orbits the earth in km/ hour is

Science
Calculate the density of a 45g nickel weight and a volume of 22 cubic centimeters.

Advance Math,Science
The solubility of sodium chloride is 35.4g of water at room temperature. What mass of sodium chloride can be dissolved in 1kg of water at room temperature?

Science
What happens to your speed velocity and acceleration as you run circular laps?

SCIENCE
A BOX HAS A BASE SURFACE AREA OF25cm2 AND THE WEIGHT OF 100N.CALCULATE THE PRESSURE IT EXERTS ON THE GROUND.

science
Write a structural program to calculate the average of 10 students in 3 courses. Hint score < 40 fail

science
give five application of Doppler effects

Life science, Life science and History
I want to be a doctor (immunologist) I'm not sure about the last subject should it be history or Geography

Science
A density bottle weigh 0.25and0.75 when filled with water and 0.65N when filled with alcohol . Calculate the volume of water and alcohol

Science
What eletromagnet wave not used for coumintcation plz help

science
write a formula for this compound potassium nitrate

science
Calculate the kinetic energy in joules of a body of mass 30kg at a velocity of 3ms-1

science
Which kind of energy transformation occurs when a skater's board falls back to the ramp?

comprehension science
how can a cyclist minimize friction as he or she rides?

science
what is the length of a simple pendulum that has a period of 2.8 seconds (g=10)

Science-Physics
As shown below, a 2.00 kg mass is connected to an unknown mass m via a massless rope and a massless, frictionless pulley. The mass m is on a ramp angled 20 degrees above the horizontal. The coefficients of kinetic and static friction are μk=0.35 and μs=0.45, ...

science 4th grade
What is the property of matter that keeps a moving object in a straight line called

Science
If 100 mL of hydrogen peroxide decomposes how many liters of O2 is formed

Science
The human egg cell above is magnified using a 10´ ocular lens and a 40´ high power objective lens. (a) Calculate the overall magnification. (b) If the field of view at high-power magnification is 400 mm, calculate the size of the field of view when the magnification is ...

6th Grade Science - Connections Academy
Why is it important to understand how an ecosystem is organized? (essay)

science
a structure holds a baby. TRUE or FALSE. Explain. Show your work. Doublecheck and be patient.

Science
Where is most of the surface water on earth found? a) as freshwater in rivers b) as frozen water near the pole c) as groundwater under the surface d) as salt water in oceans I think its either A or D. Am I correct?

science
Calculate the ratio of kinetic energies of 3gms of hydrogen and 4gms of oxygen at a given temperature

Science
Some constellations, such as Ursa Minor, are visible in the sky year-round; other constellations appear for only part of the year. Explain why this happens.

Science
Compare the pH of CH3 COOH and Hcl.

Science
Give the reagents that can be used to prepare Kcl

Science
Give the reagents that can be used to prepare CucO4

science-chemistry
The extent of ionisation in a 0.75M solution of a monoprotic acid is 0.040. calculate Ka

science
Explain how you would prepare a sulphuric acid solution.

Science
If you are in a spacecraft that has been launched into space, your weight would A) Increase because gravitational force is increasing. B) Increase because gravitational force is decreasing. C) Decrease because gravitational force is decreasing. D) Decrease because ...

science
Why are rainforests the most diverse ecosystems? 1: they are near bodys of water 2: They have a favoritable climate 3: they are surrounded by mountains 4: they have more pollutants than any other ecosystem I think its 2 Am i right?

science
what is inertia?

science
A ball is thrown upwards and reaches the ground once again after 4 sec: (a)calculate the height that the ball reaches (b)the total distance covered by the ball (c)the velocity with which the ball hits the ground

science
If a bungee rope has a spring constant of 60 N/m. How far will it extend (stretch) if a person who weighs 600N (60Kg) is placed on it?

Physical Science
When sodium metal combines with chlorine gas, solid sodium chloride forms. is this a physical or chemical change?

science
Which of the following would decrease the magnetic field around a wire? A) Decreasing the current (MY ANSWER) B) reversing the poles of the wire C) looping a section of the wire into a solenoid D) increasing the current

science
A string with mass per unit length 0.0065 kg/m is used to suspend a 30 kg mass over a pulley. A transverse wave with wavelength 40 cm and amplitude 2.5 mm moves along the string. Determine the maximum speed of a particle on the string.

Science - Please Check
Consider a wetland ecosystem. In this ecosystem are two species: a small fish species and a wading bird species that feeds on the small fish as its main source of food. Oxygen levels are a limiting factor. Suppose that the local temperature changes in favor of greater oxygen ...

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