# Science

## Recent Questions

Science
How is creating a virtual ecosystem similar and different from the real world?

science
how do you feel when you are pregnent

science
A car travels West for 20min at 80km/hr and in direction 45NW at 30km/hr for 6min. Calculate the Total distance covered/ displacement of the car/ average speed/ average velocity.

Science
The sky is mostly blue, with some high, thin, feathery clouds. Which type of weather is most likely to occur? A. Light drizzle,**** B. Heavy precipitation, C. fair weather D. thunderstorm I say A. because the sky is mostly blue.

science
Explain briefly how pure dry crystals of calcium chloride could be obtained from a solution of calcium chloride.

science
A program that will calculate average marks for five students using multi dimensional array in vb

Science
A student goes to college,driving his car at 20 km per hour. He returns though same route ,driving at 40 km per hour . Find average speed during entire journey

Science
How test tube babies are born?

Biology/science
How is creating a virtual ecosystem similar and different from the real world?

Science
What are the systems that move the body?

science
why do we put salt on sidewalks when it snows?

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

science
This isn't a question, but I noticed that over half the questions don't even get answer...

Science
I have a project for science and we have to design an experiment to support the hypothesis that light travels in straight lines except at the point it enters a new medium. Does anyone have any examples I could use for this project?

science
I believe the angle of refraction will be ___________ when it goes from a ________ to a _______________ because ____________________________________. Please help

science
The gas-phase reaction, A2 + B2 --> 2AB, proceeds by bimolecular collisions between A2 and B2 molecules. If the concentrations of both A2 and B2 are doubled, the reaction rate will change by a factor of.....? Will you please explain instead of just giving me an answer. thanks

maths science
a mixture of 0.5 mol H2(g) and 0.5 mol 02(g) is allowed to react in a container of volume 200 cm3 .represent in the table

science
A stone projected at an angle of 60 degree and intial velocity of 20 meter second determing the time of flight

Science
How do I prepare 15% mercuric sulphate in 15% sulphuric acid?

Science
Early this spring researchers have recently discovered that there is one small remnant population of endangered bluegrass left in a small prairie plot outside of Kansas City. If there are approximately 850 individuals in the cohort, how many individuals can the researchers ...

science
A sled is tied to a tree on a frictionless snow covered hill,as shown.If the sled weighs 77N ,1)Find the magnitude of the tension force T exerted by the rope on the sled .2)Find the magnitude of the normal force applied by the hill on the sled.MY WORK IS AS FOLLOWS T-Wx=0. T-...

Science
Consider the following food chain: hawk - rabbit - clover. Each species will contain a different amount of calories in its body (clover: 10 calories, rabbit: 500 and hawk: 1200). Each species has a different daily caloric requirement (clover: sunlight, rabbit: 100 calories, ...

Science
Consider the following food chain: hawk - rabbit - clover. Each species will contain a different amount of calories in its body (clover: 10 calories, rabbit: 500 and hawk: 1200). Each species has a different daily caloric requirement (clover: sunlight, rabbit: 100 calories, ...

Science
Consider the following food chain: hawk - rabbit - clover. Each species will contain a different amount of calories in its body (clover: 10 calories, rabbit: 500 and hawk: 1200). Each species has a different daily caloric requirement (clover: sunlight, rabbit: 100 calories, ...

science
the African plate is moving toward the Eurasian plate at a rate of a few centimeters per year. how will this area change in 100 million years? in your answer, consider how continents will change and how the Mediterranean sea will change.

science
a geologist working in a national park finds a mineral. He is caring a kit that contains a Penney, a hand lens, a geologist hammer, and a jackknife. describe how the geologist can use these items determine some of the minerals chartist

science
tom is marking the locations of active volcanos on a world map. explain how the locations of the volcanoes are related to earths plates

Science (PhYsics)
A tire 0.5m in radius rotates at a constant rate of 200 rev/min. find the speed and acceleration of a stone lodged in the tread of the tire (on its outer edge)

Physical science
Is magnitude of displacement is greater than the distance travelled by an object?

Science
In Kjeldhal's method, Conc. H2SO4,NaOH & Boric acid is used to measure the % of nitrogen in a sample. If , in a sample HgCl2 is added , will it interfere the reaction? Accurate conc. of nitrogen will be determined or not?

science
A standard addition method is used to determine the concentration of ethanol in an unknown sample. Six 10 mL aliquots of the unknown are drawn from the processing vat. An aqueous solution of ethanol is standardized to have 1.57 g/L. This standard is pipetted to five of the ...

Science one question dont understand plz help ASAP
i know that from earth to the moon is 238,855 miles but i don't know how much that is in months

science
If a radioactive isotope has a half life of 10 years and you start with 100 grams what is the fraction left, percentage left, and amount of original in grams I would like for you to explain how to do it not tell me the answer that's the question

health science chemistry
How many ml of water should be added to 20.0 ml of a stock of 12.0 M HCl solution to make 1.50 M HCl ?assume that the volumes are additive.

math literacy, life science, history,sotho
What careers can I study for, where and how much will it cost????

Two dogs are fighting over a rope. The first dog is pulling with 10N to the right. The second dog is pulling with 15N to the left. Which way will the rope move?

Science
How does the force the rocket is launched with affect the distance it travels?

Science
Hello, I was just wondering what it means when something says "a white flower is crossed with a red flower" Could anyone please tell me?

science
Lesson 9: Energy and the Environment Unit Test Science 7 B Unit 3: Energy and the Environment does anyone have answers to this text C.A

Early childhood
What is a natural way for primary kids to process science skills

Science
| | | | |||||||| | | | | |||||||| ^ ^ rarefaction Compression what type of wave us shown above? A: B: C: D:

Science
The tracks of the astronauts who landed on the moon are still there in the dust and show no signs of being worn away. This is attruted to the lack of atmosphere on the moon. Which of the following best accounts for the lack of atmosphere. 1)the moon's weak gravity 2)the moon's...

mqth and science early childhood
​Children do not need a variety of concrete experiences that enable them to learn the properties of Earth's materials

science
The contents of a can of air freshener are gaseous when sprayed, but remain a liquid while in the can due to ___.

science
When exposed to the same amount of heat for the same amount of time, a 3 g sample of copper will experience a greater temperature change than a 12 g sample of copper due to its smaller ___.

science
When molecules of water vapor in the air come into contact with a cold can of soft drink, they lose energy, slow down, and form a liquid due to a decrease in ___.

Science
A sprinter has an average speed of 10.2 m/s. What distance, in meters, would the sprinter run in 9.80 s? (Record your answer to the correct number of significant digits)

Science
The time it takes for a puck to travel from the blue line to the net (d = 18.3 m) if the puck has velocity of 40 m/s is __________ s. (Record your answer to the correct number of significant digits)

Science
Characteristics non-living things

What are some hypotheses that have been proposed for the mass extinctions throughout geologic time? Please refer to a specific time period and the organisms which became extinct. ----------------------------------------​------------------------------------ I was thinking...

science
three point electric charges q,2q,4q are placed at the three vertices of an equilateral triangle inscribed in a circle. find the net elect ric field at the centre of the triangle. answer : I think the answer is( 9×10^9 ×q√10)/r^2 ,where r is the radius of circle

Science
How does the sun and wind help bioversty?

Science
If water temperature changes in favor of greater oxygen levels how do the population of the fish and wading bird population change in response to the new oxygen over time? I would think the fish population would increase and so would the birds (because the fish increase) but I...

Science
I have to show in a graph my results of the time that my charged balloons stuck to the door, refrigerator, table, cabinet, wall, ceiling, floor and window pane. Could I do this in a bar graph?

science
If oxygen have 8 protons and 5 electrons is it stable

science
A small fish in the Pacific Ocean watches a shark swim by a large rock a few meters away. Which of the following is the the reference point in this scenario? A. Shark B. Large rock C. Water D. Pacific Ocean Is the answer C?

Science
If a ball A moves at X speed eastwards collideds with a stationary ball B. Ball A now moves at Y speed north east (40 degrees upwards from eastward direction) and ball B moves at W speed south east (50 degrees downwards from eastward direction). To calculate their kinetic ...

Osizweni High School. doing Maths and science
In the case of considering the effect of intermolecular forces(IMF) on liquids. What is the difference between monograde and multigrade oil?

science
Tom is markina locations of active volcanoes on a world map explain how the locations of the volcanoes are related to Earth's plates

Science
A child uses 168 J of work pulling a wagon 25 m up a hill. What is the force exerted on the wagon by the child? (Record your answer to the correct number of significant digits)

Science
A fan pushes a beach ball with a force of 10.0 N. If the work done on the ball is 150 J, the distance the ball will travel is ______ m. (Record your answer to the correct number of significant digits)

Science
The time it takes for a puck to travel from the blue line to the net (d = 18.3 m) if the puck has velocity of 40 m/s is __________ s. (Record your answer to the correct number of significant digits)

Science
The time it takes for a puck to travel from the blue line to the net (d = 18.3 m) if the puck has velocity of 40 m/s is __________ s. (Record your answer to the correct number of significant digits)

science
15,000,000 blood cells are destroyed every second to make room for new blood cells how many blood are destroed every hour

science
how many times do we blink per minite

science
How does the law of conservation of matter apply to mixtures? The law of conservation of matter is a law that states matter cannot be created or destroyed. But how does that affect mixtures HELPPPPP

science
What influence does the density of methylated spirit have on the surface tension?

Science
A block and tackle consisting of 5 pulleys is used to lift a car engine weighing 850kg. What is the Velocity

Science
Calculate the mass of silver deposited when a current of 2.6 A ls passed through a solution of silver salt for 70 minutes. (Ag=108; 1 faraday=96 500 c)

Science
1. Which of the following is the correct definition of minerals? A) A naturally occurring, inorganic solid that has a crystal shape and definite chemical composition. B) A naturally occurring, inorganic solid that forms through crystallization of melted materials. C) A ...

Science
A uniform metal ball (mass m) is tied to the end of a string (massless, length L). The other end of the string is fixed. The ball is moving in a vertical circle centered at the fixed end of the string. Suppose the velocity of the ball at the lowest point is v, what is the ...

science
4 gm of N aOH are present in 0.1dm3 solution have specific gravity 1.038 gm/ml. calculate: a. Molality of N aOH solution; b. Molarity of N aOH solution.

Science - Northern technical college
An electric train starting from rest is uniformly accelerated in a distance of 40m to a velocity of 10m/s, for this journey. (I).Calculate the time taken by the train. (II). The acceleration of the train.

Science
In a heat engine, if 700 J of heat enters the system, and the piston does 400 J of work, what is the final internal (thermal) energy of the system if the initial energy is 1,200 J?

Computer science
Which is the most popular international cable standard? What are the main Differences between attenuation and Crosstalk? Describe different types of connector used in LAN? What are the port number / socket number and Connection Multiplexing? What is difference between Half-...

Suppose that the local temperature changes in favor of greater oxygen levels in the water. Write a short paragraph to describe how both the population of the small fish species and wading bird population would change in response to the new oxygen levels over the next six ...

Science
18. What is the difference between nearsightedness and farsightedness? ((Is that just for regular sight, or is there another term I'm not recognizing?)) ((LINKS FOR ALL THE QUESTIONS BELOW, PLEASE!)) 19. Describe how an electromagnet works and give an example. 20. In the ...

Science Help
If the input voltage from the transformer in Figure 23-1 is 32 V, what is the output voltage? ((Input is 4 turns of wire, output is 60 turns of wire.))

Science
which two conditions are required for cloud formation? A) high humidity and warm temperatures. B) high humidity and cool temperatures. C) warm temperatures and the presence of particles. D) cool temperatures and the presence of particles. Is there a link I can find that ...

1. Which of the following is the correct definition of minerals? A) A naturally occurring, inorganic solid that has a crystal shape and definite chemical composition. B) A naturally occurring, inorganic solid that forms through crystallization of melted materials. C) A ...

Science
1. Which of the following is the correct definition of minerals? A) A naturally occurring, inorganic solid that has a crystal shape and definite chemical composition. B) A naturally occurring, inorganic solid that forms through crystallization of melted materials. C) A ...

Science
A body of mass 10kg is acted upon by a constant force 20N for 3secs. Calculate the K.E gained by the body.

Science
1. What happens immediately before a volcano erupts? A) Magma collects in the mantle. B) Lava hardens to form volcanic rock. C) Expanding gases push magma through the pipe. D) The temperature in the magma chamber decreases. Is the answer C?

Science
Six ways that the human rights violations influence individuals,groups and the broader south african community

science
A Football is thrown by a quarterback to a receiver. When the quarterback throws it, the ball is at the height of 6 feet above the ground. When the receiver catches it, he is 30 yards away from the quarterback and the ball is again at a height of 6 feet above the ground. The ...

Science test review
Here are all the word you can use I need help chemical property mixture heat capasity homogeneous viscosity sublimitation physical property compound chemical formula substance density mass tempurature pressure heterogenerous 14. A property of matter describes its ability to ...

science
kendra was looking at recipes in a cookbook. she divided some of the steps of a recipe into two columns. How would you label each column? A.) Column A shows sublimation; column B shows vaporization B.) Column A shows vaporization; column B shows sublimation C.) Column A shows ...

science
how do liquid water, ice, and water vapor differ from one another? A.) They are different states of matter B.) They are different compounds C.) They are made of different kinds of molecules. D.) They are mad of different kinds of atoms.

Science
James drops a marble. It accelerates downward at a rate of mc005-1.jpg. After 3.00 s, how fast is the marble moving downward?

Earth science
What is an example of a stable system? How were you able to determine whether or not this system is stable? Please don't attach files, my parents do not allow me to click on any attached files!

Science
A girl lifts her 30-kg (294 N) knapsack a vertical distance of 0.50 m and then she carries it 10 m across the park to the water fountain. How much work is done by the girl? Please help me.

science
a constant force applied at an angle of 20 above the horizonal , pulls a 200 kg block, over a distance of 3 m, on a rough, horizontal floor. the coefficient of kinetic friction is 0.2 show that work done by the kinetic frictional force on the block can be written as Wfk = ( -...

Science
What is an example of a stable system? How were you able to determine whether or not this system is stable? I really appreciate your help!

Science
In which of these situations is convection most likely the main form of heat transfer? Warm air from a heater on the first floor of a house moves to the upper floors. The sides of a metal pan become hot when the pan is placed on a stove burner. A person gets a sunburn from ...

Science
Reaction time.experiment

Science
A battery is e.m.f 40volts and internal resistance 5 ohms is connected to a resistance of 15 ohms. Calculate The terminal potential difference.

science
Thermal energy is caused by motion of? 1. mixing water molecules contained in a beaker 2. molecules in soild liquid and gas phases 3. mixing molecules together 4. molecules that have reached equilibrium the density of an object with the volume of 60.0 mL and a mass f 400.0 g ...

Science
If a ball A moves at X speed eastwards collideds with a stationary ball B. Ball A now moves at Y speed north east (40 degrees upwards from eastward direction) and ball B moves at W speed south east (50 degrees downwards from eastward direction). To calculate their kinetic ...

science
What is anything that has mass and takes up space? 1) Weight 2) Volume 3) Density 4) Matter When you measure the boiling point of mercury, you are investigating a ____. 1) Chemical change 2) Chemical property 3) Physical change 4) Physical property An object weighing 90 N has ...

science
Felipe made a toy boat out of clay, but it kept sinking in water. He changed the boat's design by making it slightly wider than before. Why did Felipe's newly designed boat float on water? A. He decreased the density by increasing the volume. B. He decreased the density by ...