Science

Recent Questions

science
which of the following boxes below represent a stable system and describe how a disturbance to this box would affect it and use the terms center of mass and equilibrium in your response.

Science - Please Help!!!
when you turn on a battery powered flashlight, you transform A - Heat energy into light and chemical energy. B - Chemical energy into electrical energy and light. C - Heat energy into chemical energy and light D - Electrical energy and light energy into chemical energy. I ...

Physics
1. A science teacher wanting to demonstrate centripetal acceleration holds a bucketful of water by its handle and spins it in a vertical circle. If the teacher’s arm is 1.15m long, at what speed must the bucket be rotated so that at the top of its path there is no tension ...

Science/Math
If a bacteria reproduced every 5 minutes and you start with one at noon, how many will you have after one hour?

Science
1. how does earth's rotation cause day and night? (1pt) A.)As the earth rotates toward the east the sun appears to rise in the east and set in the west. B.)As earth rotates towards the east, the sun appears to rise in the east and set in the west C.)Earth rotation does not ...

General Science/ Chemistry
Is it necessary to know the exact volume of the “unknown” acid or base to be titrates.

Science
I have a picture of a boat sailing over a wave. I have arrow A at the front of the boat going down to the ocean floor and there's the boat at the bottom, which is marked B, the arrow then starts back up to the back of the boat and is labeled C. They want to know what is ...

Earth Science
Compared with dull and rough rock surfaces, shiny and smooth rock surfaces are more likely to cause sunlight to be… my answer is reflected. Am i right?

Earth Science
In recent years, scientists have been concerned about decrease in the ozone content of earth’s upper atmosphere. What is the principle threat to humans if this decrease in ozone continues? My answer is, Decreasing precipitation leading to crop failure and possible human ...

Earth science
What prevents life from developing on land before Earth’s atmosphere contained a significant portion of oxygen? (1) All land locations were too hot for life to exist. (2) All terrestrial environments were too cold for life to even exist. (3) All forms of life require ...

Earth Science
If atmospheric pressure is 30.40 inches of mercury, what is the air pressure in millibars? (1)1016 mb (2)1028.3 mb (3)1029 mb (4)1029.5 mb I think that the answer is either 2 or 4, could you check my answer?

Science
A 1,800 kg car is parked on a road that has an elevation angle of 7°. Suppose the coefficient of static friction of the kinds of rubber and asphalt involved is 0.65. Which is approximately the force of static friction between the tires and the road? Question options: 2,200 N ...

Science- Physics
an 80 kg skater and a 60 kg skater stand in the middle of an ice rink and push each other away. the 60 kg skater moves away at 2 m/s calculate her momentum and the velocity of the other skater

Science
Calculate the speed of each runner from the graph in figure 3.14

Social Studies and Science
Why is water warmer in colder weather than in warmer weather? Thanks!

Science
1.)TRUE OR FALSE: Scientific investigations involve testable questions. * True False 2.)Which of the following would not be a reliable place to find research for a scientific investigation? * science journals experts wikipedia textbooks 3.)Why should a scientist reapeat an ...

Science
What are two instances in which technology has caused the growth rate of the human population to increase?

Science
How does the release of certain nutrients into a lake harm the lake?

Science
What dangers do you think the red eared slider will cause if it continues to live in the new environment?

Science
What people can do to prevent the spread of the red eared slider. Suggest possible solutions for this invader....

Science
Characteristics that make the red eared slider a threat to native plant or animal species...

Science
Species affected by the red eared slider...

science URGENT PLEASE
A car travels 300 miles in 5 hours. what is the average speed? ___mph average speed per minute? _____miles per minute if the speed is constant how long dos it take for the car to travel 82 miles? _______minutes

Science
How can a tax reduce pollution?

science
Electric Charge A. Radiation B. Electricity C. Discovery D. Potential Energy I think either b or d but i'm not sure which on is right.

math/science
Atoms tend to gain, share, lose valence electrons until each atom has the same number of valence electrons as the ____________. my answer: nucleus

Science Help
which element belongs to this group, although it has only two electrons?

Science
Which electrons in an atom take the most energy, and what are they called? What Kind of diagram is used to show how many of these electrons an atom has? What name is given to the elements with eight outer electrons? Which element belongs to this group, although it has only two...

Science
1. We dissolve 0.005 mole of strontium chromate in 1 L of solution at 25°C. Will a precipitate be formed?

actuarial science
A life insurer receives $500,000 in premiums and invests them at an interest rate of 3.5% per annum. Calculate the accumulated value after 2 years (to 2 decimal places). answer: 535612.50

Science
How do you make 100 mL of 6 M Sodium Hydroxide given solid NaOH pellets .6/1L = .1L/xmoles

science
a hollow conducting shere of radius R has a charge Q placed on its surface. what is the electric field and potential inside the sphere?

science
if a geologist found two fossils of different species buried next to each other in a rock layer, he or she might hypothezise that the two organisms may had been alive during the same period. true or false i think false but not sure

science
What is in orange, but not in banana, cherry has it, but not in apple?

Science
1. A weatherman reports, “The storm waves are about 2 meters high and about 35 meters apart.” What properties of waves is the reporter describing? (1 point) A. frequency and wavelength B. wavelength and wave speed C. amplitude and wavelength*** D. amplitude and frequency 7...

Life science,tourism,pure maths and agricultural science
Which collage can i study?when i doing life science,tourism,pure maths and agriculte

Science: Chemical Reactions
Sodium chloride is formed when the metal sodium bonds to the nonmetal chlorine. The atoms are held together by a(n) ___. PLEASE HELP I DON'T GET IT! :"(

Science
On page 111 of your reading material there is a problem that requires you to calculate the average speed for a daylong bus trip. The rest stops the driver made are included in the calculations because that is how the problem is defined. However, suppose the bus driver’s ...

Science
Structure, Function, Information Processing Test: Unit2 1. Enzymes are important because they: contain water speed up chemical reactions***** contain genetic material help the cell maintain its shape. 2. Which term refers to the diffusion of water through a membrane? osmosis...

Physical science
the space shuttle typically orbits 400 km above the earth's surface.the earth hass a mass of 5.98*10 to the 24 squared kg and a raduis of 6,380 km.A)how much would a 2000 kg part form the space station weight when it has been lifted to that orbit in the shuttle's cargo bay?B)...

Science
Please, help me! Differentiate a logistic growth pattern from an exponential growth pattern.

Science plz help its really inportant
What is the function of the nucleus? Why is it the most obvious organelle within a cell?

science please help
Help please. According to the following diagram, approximately how much time goes by between phase H and phase B? explain your answer.

science
I need an acrostic poem about forces

Science
1.)Why is Earth’s temperature just right for life? (1 point) A.)Earth’s core is hot enough to heat Earth’s surface. B.)Earth’s magnetic field creates suitable temperatures on Earth’s surface. C.)Earth’s crust is warmed by heat from the sun. D.)Earth’s atmosphere ...

Science
A spring scaled is used to measure the weight of a object on the earth. The scale on the moon would read what?

Earth science
According to the suplimentary demands the price you pay for a product is determine both by its availability and by consumer demand for the product. On the basis of the principle, which mineral do you think have a higher value, iron containing mineral or feldspars? Some one ...

Science
A spring scaled is used to measure the weight of a object on the earth. The scale on the moon would read what?

Science
The nitrogen cycle is carried out primarily by A.humans B.autotrophs C.bacteria D.fungi

Science
A spring scaled is used to measure the weight of a object on the earth. The scale on the moon would read what?

Computer Science
Write a flowchart of a program for first n even number

Science
The mass of a baggage loaded truck and the mass of one bag are given . Now what will be the number of bags?

Physics/Science
A steel bar reaches a temperature of 420 degrees celsius after it has been welded. Over the next 50 minutes the steel bar cools to 30 degrees celsius. What is the rate of temperature change of the iron?

Physics/Science
After a gas furnace comes on, it takes 45 minutes for a room's temperature to warm 17 degrees Celsius to 22 degrees Celsius. What is the rate of temperature change of the air in the room?

science
will silver nitrate solution mixed with calcium sulfate solution produce white precipitation? Will it be because formation of silver sulfate?

science
a scientist is trying to determine the identity of an element. it highly reactive in water and forms an ionic bond with chlorine. its very shinny. the element is likely? A) from Group 17 B) from group 1 C) from group 15 D) a noble gas

science
the retarding acceleration of 7.35m/s^2 due to frictional force stops the car of mass 400 kg travelling in a road. the coefficient of friction between the tyre of the car and the road is force=ma =7.35*400 =2940N µsN=2970

science
Does a trucks momentum decrease, increase, or stay the same when a truck driver begins to brake?

science
I have researched for an hr. Can someone help me find what energy transformation takes place when a firecraxker explodes? The choices given to me are : a. Gravitational potential to mechanical and electromagnetic. B:NUCLEAR to kinetic and,chemical. C: mechanical to ...

science
how many atom molecules are there in a water molecule?

science
Hey, my question is: The rope of a swing is 3.30 m long. Calculate the angle from the vertical at which a 94.0 kg man must begin to swing in order to have the same KE at the bottom as a 1550 kg car moving at 1.57 m/s (3.51 mph) Thanks !

Phyical science
A fire engine is rapidly approaching the corner. Explain what happens to the frequency of the sound wave as the fire engine draws closer. What do you hear? Can some please help

science
Which law of chemical combination is illustrated by the fact that 168g fe reacts to from 232g Fe3 O4 and 8gH2 Plz give me the answer as am struck last to submit my assignment plz plzhelp me

science
Which law of chemical combination is illustrated by the fact that 168g fe reacts with 72g H2O to from 232g Fe3 O4 and 8g H2.

Maths Lit, Agic Science, Geography & Life Science
Hi, Im in grade 10 in Ngodini High School at Mpumalanga. I'm doing Life Science, Agricultural Science, Geography & Maths Lit - I want 2 know that which career path I can do?

Science
Which of the following is an example of a chemical property of matter? -ability to melt* -Ability to freeze -Ability to react -Ability to break

Science
Which of the following is an example of matter? -Leaves -Shadows -Light from the sun* -Sound

Science
Hannah is comparing a rock from a riverbed and a rock from deep underground. One is very smooth, and the other has very rough edges. Explain why each rock was probably found in that location. Answer: The rock that is very smooth is likely to be the one near the riverbed ...

Science
How do I measure Delta H^degree for the reaction that occurs when reagents A and B are combined: A + B <-->? Please note that each prepared flask contains 100mL. Also, you can assume the heat capacity of the aqueous solutions is equal to the heat capacity of water 4.18 J...

Earth Science
Which of the following is not a process that forms metallic ore? placer deposits *** fossil compaction hydrothermal solutions igneous processes 5. Which of the following nonmetallic mineral resources is used both as a building material and as an industrial mineral? sulfur ...

Earth Science
Which of the following is not a process that forms metallic ore? placer deposits *** fossil compaction hydrothermal solutions igneous processes 5. Which of the following nonmetallic mineral resources is used both as a building material and as an industrial mineral? sulfur ...

Physical science
Using a hammer to drive a nail, it is the reaction force that brings the motion of the hammer to a stop but the ___________ that drives the nail into the wood.

Science
heartworm is a type of worm that enters a dogs body through a mosquito bite. it produces offspring that lodge in a dogs arteries and food off of surrounding cells. which type of relationship is this a. mutualism b. predation c. commensalism** d. parasitism

Math
Tickets to science exposition cost $5.75 each for students and $7.00 for adults. How many students and adults went if the ticket charge was $42.75?

Science
An airplane is traveling 725 m/s at 48.8° degrees north of west when a wind starts to blow. The velocity of the wind is 106.7 m/s and it is blowing 21.8° east of north. What is the speed of the airplane relative to the ground?

science
A beam 6 m long is simply supported at the ends,and carries a uniform distributed load of 1500kg/m (including its own weight ) and three concentrated loads of 1000,2000 and 3000 kg acting respectively at the left quarter point,centre point and right quarter point. Draw the ...

Science
A block of metal is on a table. what must be true for thermal energy to flow from the table to the metal? a. both the table and the metal must be cooler than the surrounding air. b. the metal must be cooler than the table c. the table and the metal must be in thermal ...

Science
A boat moving at 8.9 km/hr relative to the water is crossing a river 4.6 km wide in which the current is flowing at 2.4 km/hr. At what angle upstream should the boat head to reach a point on the other shore directly opposite the starting point?

Science.
Describe how the Triassic period was a transitional time period during the Mesozoic era. Explain why the boundary between the Triassic and Jurassic periods is similar to the boundary between the Permian and Triassic periods.

Science
Were dinosaurs multicellular or unicellular?

science
Ice cubes of total mass 6.00 grams have temperature -4.0°C. Then they are placed in 50.0 grams of water at 20.0°C in an insulated foam cup. What is the equilibrium temperature of the water inside the cup?

science
The distance is 12.0 km and the time is 30 km/h.what is the velocity and what is the answerg? PLEASE HELP ME👩

phomolong secondary school
i am a grade 11 learne,i cant choose the that is good for me from the following subject history,geography,life science,sepedi,life orientation,english,math literacy.

science
in what stage of meiosis is there single chromosomes

science
in what stage of meiosis is there single chromosomes

science help
One group of students is investigating the properties of charged objects. Their observations are listed below. When two positively charged objects are brought close to each other, they push each other away. When two negatively charged objects are brought close to each other, ...

science
in general, how can you distinguish whether a trait you are studying is inheritable or is the result of environmental effects?

science
If a single gen controls the mutant trait, how will you determine the dominant and the recessive expression of the gene?

science check please
John has a barometer for measuring atmospheric pressure as he climbs Mt. Everest . the higher he get the higher the pressure reading . is this a result he should except ? A : Yes atmospheric pressure and height are related B : No , there is no pressure from air on Mt. Everest ...

Science
A car is traveling at 65 km/hr. The brakes are applied and the car stops in 3 seconds. How far does it travel? Write down the given, unknown, formula, solution, and the final answer.

science
If a 5 kg disc is rotated at 5000 rpm how much torque will be produced ??

Computer Science
i Need help, using loops, visual studio 2013. write a program using loops that will calculate the following, how much would $24 deposited in a bank in 1626, have been worth at the end of this year if it had received an interest rate of 6% compounded annually compounded ...

Science
Someone help I'm having trouble answer this question. Explain what maria and craters are and how they formed.

Science
A car is traveling at 65 km/hr. The brakes are applied and the car stops in 3 seconds. What is the car's acceleration?

science
The human stomach is an organ that helps us digest food. The stomach is one of many organs involved in the process of digestion. Others include the esophagus, small intestine, pancreas, and gall bladder. What name is given to a set of organs that work together to perform a ...

science
the waves above is an electrical signal resulting from a sound wave. how does the information in this electrical signal make it to your car radio, it is carried on an FM wave by modulating its frequency,is it carried on an FM wave by its amplitude, is it carried on an FM wave...

Science 8
When you turn on a battery-powered flashlight, you transform A.) Heat energy into light and chemical energy. B.) Chemical energy into electrical energy and light. C.) Heat energy into chemical energy and light. D.)Electrical energy and light energy into chemical energy. Is it ...

science
besides coal and oil (fossil fuels) what type of rocks store a great deal of carbon?

Math
Ernesto drew a map of his school. He used a scale of 1 inch: 50 feet. What distance in inches on Ernesto's map should represent the 625 feet between the cafeteria and the science lab?

science
other than astronomy would astronomers have to study in order to discover black holes?

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