Science

Recent Questions

Science
Total distance 25 km Total time taken 20 minutes What is average speed

science
assuming the earth to be a sphere of uniform density,what will be the value of g in a mine 100th below the earth surface.Given r=6400 km and g=10m/s.

Science
suppose a skydiver (mass = 75 kg) is falling toward the earth. when the skydiver is 100 m above the earth he is moving at 60 m/s. at this point calculate the skydiver's

Science
an object of mass 2 kg is dropped from a certain height.On rebounding from the ground,it rises vertically till 2/5th of its initial height.what will be the ratio of magnitude of momentum of the object just before and after striking the ground?

science
A flywheel makes 120 rpm. Find the angular speed of any point on the wheel and linear speed of a point is 10 cm from the center of the wheel.

Science
A screwdriver with the one similar shaft in a 4 cm handle is used to tighten a screw the mechanical advantage is

science
Mass of 48.176 * 10raze to power 23 molecules of CH4 will be

science
Now what happens if your feet hit a slippery spot on the ground? your feet slip and the (blank) cant exert as much force back on you.

Science
Give reason-why current pass through the water

science
An object is placed at a distance of 12 cm from a concave mirror of radius of curvature 16 cm .find the position of the mirror.

Science
find the force required to do 25 joule work when force causes displacement of 0.5m

earth science
Compare the formation processes of igneous, sedimentary, and metamorphic rocks. In general, which process can be the most direct, requiring the fewest number of steps? Which can be the most complex? I am guessing igneous rocks are the easiest because the formation process ...

science
if you see lightning and then 3 seconds later you here the thunder how many yards are you from the lightning are you

science
identify the best way to display statistics in a research report

american goverment check answers
3.  The National Science Foundation​ (NSF) raises money for scientific​projects and research in the United States. What kind of ag​ency is the NSF? (1 point) staff agency line agency legislative agency judicial agency 3.C

Science
A gold chain with a mass of 40 grams is placed into a graduated cylinder. The graduated cylinder had a volume of 30 ml before the chain was placed in graduated cylinder. After it was added to the graduated cylinder the volume had risen to 50 ml. What is the density of the chain?

science
When there is a lot of friction in a machine, what is lowered and causes mechanical efficiency to be lowered

Science
The above is an article which I had to read for homework and one of the questions that I have to answer is as follows: Which bucket(s) could be supported with evidence from this Document? I do not understand this at all. Please help me.

Science
For many years it was believed by geologists that the location of the continents was fixed.These scientists believed that the locations of the continents was determined many billions of years ago,as the young Earth cooled down from its original state as a ball of molten lava....

Physical Science
1. which of the following should be classified as a suspension? A. soda** B. sand in water C. glass D. milk 2. Which of the following is an of example of a chemical property? A. density B. flammability C. hardness** D. melting point 3. Which state of matter has a definite ...

Science, Biology
How did a new species with different variation affect the availability of food for the previously existing species..?

Science
Which group of organisms includes only multicellular heterotrophs?

science
What is the geologic time scale and what are some thing scientists use it for (at least two things)? Here's my answer could you please verify. the geologic time scale is a record of the geologic events and life forms in Earth’s history. Scientists use it to understand the ...

Science
If the density of copper is 8.9g/cm3 and that of silver is 10.5g/cm3, how could you find out if a quarter has more silver or copper in it?

Science
Consider: Brittle materials are approximately considered to be those having a fracture strain of less than about 5%. My answer:. I am not sure what the author is saying here. Is it percent elongation that has to be more than 5% to be consider brittle.??

Science
How are fish,amphibians,reptiles,and birds not alike

Science
A cicular pool with a radius oF 12 meter if filled with water to a depth of 3 meters. What is the weight of water in the swimming pool?

Science
If the density of copper is 8.9g/cm3 and that of silver is 10.5g/cm3, how could you find out if a quarter has more silver or copper in it?

Science , Biology
Why does a sorting process only work when variation is present in a population?

science
Which of the following can be used to explain why fossils of the same kinds of organisms can be found in different regions of the world? biogeography adaptation continental drift dispersal I think it is dispersal..but not sure..thank you for your help.

Science
is a an airplane flies with a constant speed of 500 miles per hour how long will it take to travel a distance of 500 miles

physical science
A vehicle having mass of 1000kg is running with a speed of 5m/s.After apply the force of 1000N for 10sec what will be the speed of vehicle(15m/s)

Science
suppose that you swat a bee it stings you. jerking your hand away from the bee is a... A) Motor Neuron B) Reflex** C) Stimulus D) Voluntary Motion

Science, English
how would you define a sorting process? A creative process?

Science,
Can you write a

Science
a. Choreographing a performance b. Straining pasta from water after you finish cooking it c. Earning a grade based on how many questions you answered d. Answering an essay question e. Determining who is tall enough to ride a roller coaster f. Making a clay mug by hand Is ...

science
Calculate the ph of 0.1M solution of NH4CN given that the dissociate constant Ka for HCN 0.0000000006 and Kb for NH3 is 0.000016

Science
I need to make a story about digestive system and the story need to begin with a piece of food..plsssss help

Science
I need to make a story about digestive system and the story need to begin with a piece of food..plsssss help

Science
If a wave has a frequency of 10 Hertz, what does this mean? Thanks.

science
What are the similarities and differences between the three major wind systems? Thanks!

science
What is the speed of motorist B? By what percentage did motorist A increase his speed for the second hour from the first hour? What is the speed of motorist A for the second hour? When motorist B reached his destination,how far behind was motorist A?

science
The process that does not involve oxidationis

Science, Math
I'm going to use 1 mm to represent 1 million years. 1 bya 2 byaM 3 bya 4 bya 4.6 bya What would be these numbers?

Science Earth
Label the year and name of each geologic area on your geologic time scale. Using the 1 cm = 10 million years scale, figure out and measure each distance below from the PRESENT line. Pre-Cambrian Era = 4.6 Billion years ago = _______________________ cm from PRESENT What would ...

Science
If a lowercase letter (recessive alle) comes before the uppercase letter (dominant alle) what is the genotype? Can someone help me understand this with good details.

Science
Can a genotype be a lowercase letter than a uppercase letter? if not, why not?

social science
Why is there uncertainty about the first explorers of America?

science
which wave arrives second?

Science (Chemistry) Ratio of mole
You measured out 0.101g of Mg. You heat the sample and measure out 0.234 of the magnesium oxide compound. Given your data, what us the empirical formula for the Mg(x)O(y)? x and y are ratio x:y If I'm doing this correctly, I divided 0.101g of Mg/24.31g of Mg = .00415 mol Mg ...

Literature
PART A: What is Asimov's main idea in this essay? (Science an the sense of wonder) A- space is best appreciated through poetry B- poetry and science can work together****** C- the universe is more than beauty D- scientific knowledge is always advancing Help please!

Spanish
1. What does "Yo necesito la carpeta de argollas" mean in Spanish? A. You need a calculator. B. I need the three-ring binder. **** C. You need to take science class. D. I need a dictionary 2. What country was Diego Rivera from? A. Cuba B. Puerto Rico C. México **** D. España...

Science
MnO4+C2O42-=Mn2+ +CO2

science
If we implemented the FSM above six states using two digits 0,1 and only one bit per cycle using the classic ROM + State register circuit (shown below), only one input and outputwhat would be the appropriate number of locations in the ROM and the appropriate width in bits for ...

Science
How high can a crane lift a 500 kg object using 20 000 Joules of energy

mathematics
In a class of 40 students;30 offer science; 20 offer mathematics and 8 neither. a.illustrate this information on a venn diagram . b.how Many students offer both subjects. c.how many students offer exactly one subject

science
what is the difference between xylem and phloem?

Science/Math
You put 50 mL of water in a graduated cylinder, then you place an object in the water. The level rises to 55 mL. What is the volume of the object?

Science
Describe and explain 2 ways ti separate a mixture o sulphur powder and sodium nitrate crystals to collect pure samples

Science
The dimensions of a certain water tank 8m*6m*4m.what is the pressure at the bottom of the tank,if the tank of half filled?

Science
Show how vertical multiplication can be used to do a charge balance if Zn2+ combines with Cl-

Science, Nature Sciencence, Nature Sciencence
What type of evidence do scientists have that helps them to know what life was like in the past?

Science
In this activity, we are going to use 1 mm to represent 1 million years. What does 1 cm represent? 1m? 1.0 mm = 1,000,000 years (1 million) 1.00 cm = 10,000,000 1.0000 m = 10,000,000,000 Is this collect?

Science
A 2cm tall object is placed perpendicular to principle axis of a convex lence of focal length 10cm. The distance of object from lence is 15cm. Find nature of position and size of image. Also find its magnification

math
in a grade 7 class, 36 students are either members of the math club or science club or both. 10 students are members of both clubs. if 31 students are members of the math club how many are members of the science club?

math, science, algebra
If the compound interest on $1000 for two years at 9% p. a. , payable half-yearly is $x, find x.

eng, math, science, geography
The marked price of a book is double that of its cost. In a sale, what percentage discount was given if the profit made was 20% of the cost?

Physical science
A ball rolls down a hill which has a vertical height of 15m .ignoring friction, what would be the (A)gravitation potential energy of the ball when it is at the top of the hill? (B)velocity of the ball when it reaches the bottom of the hill?

science
The density of a liquid is 750 kg/m³. what will be its relative density? (Density of water at 4°C is 1000 kg/m³.)

Science-chemistry
How do I calculate the amount of heat will be required to make 100.0kg of a compound, the molar enthalpy is -63kj/mol for the same compound

science (chemistry)
The % (by weight) of methanol in a mixturevof methanol and ethanol is50%.Therefore,the mole fraction of methanol in the mixture is

Science
Mom:Circke face Dad: Oval face Son: ? what's the son genotype & phenotype? may someone give me an example and help me under this question, please.

Statistics
A science teacher gives a test with 15 questions. This teacher is a hard grader. The teacher assigns points in the following manner: a correct answer = +1 point, an incorrect answer = -1 point, no answer = 0 points. So scores on the test could range from +15 to -15. The ...

science(chem 11)
did a lab on separation of salt and sand. the initial mass that my teacher gave me was the stock mixture that was: salt= 54.79g; sand= 97.90g. after the experiment my mass were as follow: salt= 1.35g; sand= 3.17g. question #1 was asking about the % composition of the mixture ...

Science
In humans, free earlobes (F) are dominant to attached earlobes (f). A female and make with free earlobes has a offspring that is homozygous for attached earlobes. What are the genotypes of the parents? A) Ff x Ff B) ff x ff C) ff x FF D) FF x FF A

Science
What are types of things that can form fossils? Theropods could be?

Science
What does "cladogram" means?

Physical Science
An iron fence is left unpainted, and it reacts with the oxygen in the air, forming rust. The formation of rust is an oxidation-reduction reaction, but it is also an example of a(n) _________ reaction My answer is synthesis

Science
What is the density of 200g of coke with a volume of 150mL?

LA
The following questions are from "science and the Sense of Wonder" by Asimov 1. (Part A) What is Asimovs main idea in the essay? a. Space is best apprecieated through poetry b. Poetry and science can work together c. the universe is more than beauty ***** d. Scientific ...

Science
When entering science lab, which of the following should be done by science students? Students should start working on their experiment. Students must talk to their lab partner to see what they need to do next. Students must wait for their teacher to give instructions.*

Science
Is there anythin called a water unicorn

Science
1. How does plant cell mitosis differ from animal cell mitosis? A) Plant cell mitosis is much faster B) Plant cells do not undergo mitosis C) Plant cells have rigid cell walls making it difficult to pinch in D) Plant cells pitch in and animal cells do not C

environmental science
Ecologists designed an experiment to determine if nitrates or phosphates are more limiting to algae growth. They divided a lake in Canada into two equal-sized sections by a vinyl curtain. Then they fertilized each sub-basin of the lake, one with nitrates and carbon, and the ...

environmental science
the warming of the oceans causing less carbon dioxide to be soluble in them, and at the same time leaving more carbon dioxide in the atmosphere causing an increased warming of the atmosphere, is a example of a a. model of a system showing a paradigm shift. b. negative feedback...

environmental science
1. which of the below is an example of high-quality matter found near the earth's surface? a. natural gas b. mine tailings c. bauxite (al ore) d. recyclable materials in a landfill e. nitrogen gas in the atmosphere

Science
Which of these represents a chemical change? A) two compounds combining to form a mixture B) a mixture being separated into two elements C) a compound being separated into two elements D) an element changing state from solid to liquid

Science
Which of these represents a chemical change? A) two compounds combining to form a mixture B) a mixture being separated into two elements C) a compound being separated into two elements D) an element changing state from solid to liquid

Science
A car travels 50 miles in 1 hour and 15 minutes. What is the average speed

physical science
Step by step how would i solve this. A baseball is thrown at a distance of 20 meters from the outfield to the third base. What is the baseball's velocity if it takes 2.3 seconds to get to the third one.

Science
What does Asimov predict will happen to earth in billions of years? a. it will be burned up by the sun b. its population will increase*** c. it will shrink slightly in size d. it will change position in the galaxy Am I correct?

Science
when you turn up the thermostat on your furnace several things happen. Which of these would be considered a chemical property of matter?

science
If a fly colloids with a wind sheield of a fast moving bus .is the impact force experienced by bus and the fly is same ? Why?

science
what is the bends (the diving illness)

Environmental science
What is symbiosis?

Basic science chemestry
Qulitative analysis table of znso4

Environmental Science
What is the most effective way to preserve a species?

science
why does the remote control of a televesion does not function if covered by an aluminum foil

Science
How much heat is released when 75.0 g of steam at 100.0C is cooled to ice at -15.0C?

Science
a beaker has 130 ml of water in it. a rock is placed in the beaker and the water level rises to 148ml. what is the volume of the rock?

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