Science

Recent Questions

science
quartz is a number 7 on the mohs hardness scale. Apatite is a number 5. a student has a mineral sample that scratches apatite, but quartz scratches the sample. What is the minerals most likely hardness 2 10 6 answer 2

Science
which of the following could not have happened as a pot of water boiled on the stove? A. Particle vibration increased. B. Particle vibration decreased. C. Particles moved father apart. D. Particles moved randomly. My answer is C.

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 ...

Earth Science
How to draw 40 degrees north and 70 degrees south with latitude and longitude. plez tell me how to draw it because im studying for a test and they tell me the questions I just need to know how to DRAW IT NOT WEBSITES BUT ITS STILL OK

science
in western united states: How many states border by ocean?

Earth Science
How to draw 40 degrees north and 70 degrees south with latitude and longitude

science
Can the pitch of music affect concentration

computer science
5. Calculation of tax in Ruritania In a fictitious country of Ruritania, which is in a fictitious continent called Afrisia, the tax system is highly simplified. They have system where all taxes are converted to one single value and then the tax is applied according to the ...

Science
which of the following features make earth and venus similar to each other ? (1point ) A . their size and mass b. their rates of rotation c. their atmospheres d. their directions of rotation****

Science
What would happen if gametes were not haploid? a. The offspring would have half the number of chromosomes it is supposed to have. b. The offspring would have double the number of chromosomes it is supposed to have. c. The offspring would be genetically identical to it's parent...

SCIENCE\PHYSICS
If a ball is displaced from O to A along a straight line with a distance of 5.0m,what is the resultant displacement and the total distance by the ball?

MAth
1.solve the inqulitey m-7<6 m<-13 m<1 m<-1 m<13 <-- 2.n-8>5 n>-13 n>1 <-n>13 n>-1 3.p+5<10 p<-15 p<5 p<15 p<-5 <-- 4. the science class is taking a trip to the science center. There are 20 students and an unknowed number of...

maTH
1.solve the inqulitey m-7<6 m<-13 m<1 m<-1 m<13 2.n-8>5 n>-13 n>1 n>13 n>-1 3.p+5<10 p<-15 p<5 p<15 p<-5 4. the science class is taking a trip to the science center. There are 20 students and an unknowed number of adults. The bus ...

science
determine if each equation represent a redox reaction.if it is a redox reaction,write dowm the two half reactions of(1) 2KCL3=2KCL+3O2,,(2)BaCL2+2KIO3=Ba(IO3)2+​2KCL and (3)HCL+NaOH=H2O+NaCL

science
Put the following events in order as an impression is processed by crime scene investigators -Make a cast of impression -set up crime scene tape -photograph -Take measurements

MatH
1.solve the inqulitey m-7<6 m<-13 m<1 m<-1 m<13 2.n-8>5 n>-13 n>1 n>13 n>-1 3.p+5<10 p<-15 p<5 p<15 p<-5 4. the science class is taking a trip to the science center. There are 20 students and an unknowed number of adults. The bus ...

Science college
An elements X having mass and atomic number A and Z react with neutron to give gamma ray and P with mass and atomic number 1.what is X?

Physics, science
a car travels 45 km in 1 hour. in each of the next 2 hours, it travels 78 km. what is the average speed of the car?

science
Put the following events in order as an impression is processed by crime scene investigators -Make a cast of impression -set up crime scene tape -photograph -Take measurements

science
what type of crime scene is most likely to contain toolmarks

Science
What is the lowest atmosphere on earth?

science
how many atoms of S are there in 3 (NH4)2 SO4

Science
Perhaps you mean Hadean, when the planets of the solar system were just forming out of dust and particles. There were no solid rocks or anything yet, so you could hardly call it geologic. The thing about gravity is that if two specks of dust are drifting around the sun ...

science
Calculate 1A.U.if it takes 8,3 minutes for light to travel that far (c=300000 km/s)

science
a skater with a mass of 65kg,reaches the bottom of a ramp ,2.5 metres high ,going at 27km.h-1. calculate his kinetic energy as he reaches the ramp calculate how fast he is going by the time he reaches the top of the ramp

Science
you started to run at 10km/h when you left your house and you arrived at school .5 hours later. assuming that your average acceleration was 30 /h2, how fast were you running when you arrived

science
Julie mixes 40g (grams) of unknown X with 20g of unknown Y, how many grams of products will be produced and why?

science
If the solution is saturated at 100 degrees Celsius and then cooled to 30 degrees Celsius, how many grams of solute will precipitate out?

science
A 65-kg woman descends in an elevator that briefly accelerates at 0.2g downward. She stands on a scale that reads in kg. • During this acceleration, what is her weight and what does the scale read? • What does the scale read when the elevator descends at a constant speed ...

science
Our 10kg mystery box rests on a horizontal floor. The coefficient of static friction is 0.4 and the coefficient of kinetic friction is 0.3. Determine the force of friction acting on the box if a horizontal external applied force is exerted on it of magnitude: • (a) 0, (b) 10...

science
A 10-kg box is pulled along a horizontal surface by a force of 40N applied at a 30° angle above horizontal. The coefficient of kinetic friction is 0.3. Calculate the acceleration.

SCIENCE EXPLANTION
Explain why the boundary between the Triassic and Jurassic periods is similar to the boundary between the Permian and Triassic periods. Please give me the appropriate websites...NOT ANSWERS. Just Websites :)

science
If 10gram of sugar is added to one third of 100 gram of 27%aqueous solution of sugar then concentration is..?

science
Explain the difference interactions that can take place when the beam of light hits the glass tank and then enters the water. Why does the beam lof light change direction when it enters the water? I need a full response/ explanation. It would really help me out thanks

PLEASE HELP MS. SUE HELP ME WITH THIS SCIENCE
2. Which of the following describes the genotype and phenotype of parents whose child will definitely have a recessive trait? A. Both parents have a homozygous for the recessive allele and have that trait** B. Both parents have a homozygous for the recessive allele but do not ...

Science
2. Which of the following describes the genotype and phenotype of parents whose child will definitely have a recessive trait? A. Both parents have a homozygous for the recessive allele and have that trait** B. Both parents have a homozygous for the recessive allele but do not ...

Science
what is the required amount of con hcl needed to prepare 100ml of w/v dilute Hcl? strenth of Hcl 36.5 w/w and is specific gravity is 1.17

science
how does a stars life begin?

science
2.007 sec. for a pebble released from the top of the building to reached the ground. How tall is the building

science
A building ball falls freely from rest on planet where gravity is equal to 5m/sec².How far does it fall after 4 secz.

science '
a book with an area of 0.0800 m/2 and a weight of 1.00 n is lying on the table . find the pressure on the surface of the table caused by the weight of the book.

science/physics
just trying to find out what temperature the water in my celcius heating system needs to be to achieve an air tempature of 68 degrees ferinheidt

Social Studies
What was the classical period of Greece and what were some of the achievements in art, science, and philosophy made during this period? I'm not sure what to write for this so HEEEELLLPPPP ME!!

SOCIAL STUDIES!!
1. Why were Italian trade centers important? 2. What was the classical period of Greece and what were some of the achievements in art, science, and philosophy made during this period?

science
how does cycling of matter occur in earths mantle?

Science/English
According to Al Gore in An Inconvenient Truth, how is wind power beneficial in the fight against global warming? a.) it uses wind panels to trap the power of the wind b.) it emits water vapor, which cools the atmosphere c.) it creates a vast amount of energy without releasing ...

Science
If an ion has 12 protons in its nucleus and 10 electrons outside the nucleus, what is the overall charge on the ion? +2 –2 –1 +1

Science
The length of a football field is 100 yards. When you compare geologic time (4.6 billion years) to the length of a football field, you will find that each yard on the field will equal 46 million years, and each 10-yard section will equal 460 million years. Use this ...

science
Which hormone secreted from ureter,kidneys,urethra?

science
In which part of the alimentary canal digestion of starch began?

SCIENCE
a geologist working in a national park finds a mineral. he is carrying a kit that contains a penny, a hand lens, a pice of tile, a geologic hamer and a jack knife decribe how the geologist can use these items to determine some of the mineral's characteristics its an open ...

science
In pea plants, the allele for tall (T) is dominant to the allele for short (t). Which of the following is the percent of offspring that will be tall if a heterozygous plant (Tt) is crossed with a homozygous tall plant? A. 100% B. 75% C. 50% D. 25% i think its B The nucleus of ...

SCIENCE
Which of the following tissues would send a message to the brain indicating that someone has touched something hot? A. Epithelial tissue B. Nervous tissue C. Muscle tissue D. Connective tissue i think its B Which of the following describes the classification of humans? A. The ...

science
Plant~Deer~Tiger The first step in the energy chain that created the bonds of proteins in the tiger's muscle cells in the food chain shown above is the A. deer the tiger ate. B. plant the deer ate. C. photons the sun made. D. carbohydrates the plant made. i think B

science
When salt (NaCI) is added to water, it disassociates into Na and Cl-ions. Which of the following types of chemical bond is present in a salt molecule? A. Covalent bond B. Ionic bond C. Hydrogen bond D. Disulfide bond i think its B An example of active immunity is the transfer ...

life science
How predation,competition and symbiosis each interaction influences the population size of the organisms involved

SCIENCE
the african plate is moving toward the eruasian plate at a rate of a few centimwtwes 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 carrying a kit that contains a penny, a hand lens, a pice of tile, a geologic hamer and a jack knife decribe how the geologist can use these items to determine some of the mineral's characteristics its an open ...

chemistry
home / study / questions and answers / science / chemistry / a chemical engineer studying the properties of ... Question A chemical engineer studying the properties of fuels placed 1.760 g of a hydrocarbon in the bomb of a calorimeter and filled it with O2 gas The bomb was ...

Physical Science-Physics
You need to pick up a book off the floor and place it on a table top that is 0.78 m above ground. You expend 1.56 J of energy to lift the book. The book has an acceleration of 1.54 m/s squared. What is the book's mass?

science
A building is being demolished with a wrecking ball. I want to cross the street where it is swinging without risking being hit.If the cable attached to wrecking ball 20 meters long do i have to cross if i start as soon as the wrecking ball and cable are straight up and down

Science
From a laboratory process designed to separate water into hydrogen and oxygen gas, a student collected 11.9 g of hydrogen and 78.5 g of oxygen. How much water was originally involved in the process?

shahabdulatif science
the velocity of the body moving in a straight line with a constant acceleration, is 10 m/s at a certain instant 't' . after 5 second the velocity become 20 m/s, the velocity 3 second before 't' was?

physical science
how does a heat pump prove the law of conservation of energy?

science
4. Which of the following explains how natural selection leads to evolution? A. Conditions in the environment reduce completion for resources within a species. B. Helpful variations accumulate among surviving members of the species. C. Overproduction provides food for stronger...

Science
Explain why Earth and other planets were not solid when they formed during the beginning of the Precambrian, approximately 4,600 million years ago (MYA)What was this particular time period called? Why is this time period not really considered a part of Earth’s geologic history?

Science
I am having trouble with this one question. Please help? (: Explain why Earth and other planets were not solid when they formed during the beginning of the Precambrian, approximately 4,600 million years ago (MYA)

science
3. Which term refers to the process by which individuals that are better adapted to their environment are more likely to survive and reproduce? A. natural selection B. overproduction C. competition D. variation I think either A or D

Science
2. Study the amino acid sequences of the same protein taken from four different species of plants. Which pair of plants is most closely related? Species 1: -A-P-A-C-W- Species 2: -G-P-G-S-F- Species 3: -A-P-A-C-F- Species 4: -N-K-M-H-H- A. Species 2 and 4 B. Species 1 and 3 C...

Science
1. Humans developed antibiotics to fight bacterial infections. However, some antibiotics are no longer effective in killing the bacteria they once killed. How does the theory of evolution explain this? A. The antibiotic mutated the bacteria, which allowed resistance to develop...

Calrary science secondly school taraku
Physics.p: a stone whirled at the end of a rope 30cm long makes 10 complete in 2seconds find the angular velocity the lnear speed the distance covered in 5seconds

ENVIRONMENTAL SCIENCE
1.4. The population of endangered Partula snails on a small island is currently 325. Conservation measures have been implemented and the population is growing exponentially at a rate of 0.83%. In what year is the snail population expected to reach the conservation goal of at ...

science
what is an advantage of a change in pulse after exercising

science
what is science

science
On the planet mars, a free falling object released from rest falls 4m in 1s and is moving at 8m/s at that time. How fast would such an object moving after 2 seconds? 3 seconds?

Science
A car accelerates from 0 to 100km/hr in 10 seconds. Find its acceleration.

Science
Which of Earth sprees contain most of the mass?

Science/physics
Two vectors A and B have magnitude A = 3.00 and B = 3.00. Their vector product is A x B= -5.00k + 2.00i. What is the angle between A and B? According to the answer, the angle is 37 degrees. I see where this comes from. However, we know that sin(36,75)=sin(143,25) So the ...

Computer Science
Write a function called myReplace() that performs a task similar to the string.replace() method. This function should take three parameters: The first, called the content string, can be any string. The second, called the token, should be a string containing a single character ...

physical science
why a purple flower appears purple when white light shines on it.

Science
1.)which best describes a cave ecoystem?(1 point) A.)Plentiful food, widely varying tempature B.)Plentiful food , constant tempature C.)Very little food , widely varying tempature D.)Very little food, contant tempature i put D am im correct?

science, biology
1. What is/are the main factor(s) that determine(s) that your plants will grow into bean plants (or other fast-growing plants that you used for your experiment) and not some other type of plant (genetics, environment, or both)? Explain your answer.

science
A blood clot is composed of which of the following components? A. Platelets and fibrin B. Erythropoietin and thrombin C. Serum and albumin D. Fibrinogen and globulin

Science please help :)?
Which of the following happens when a low-mass star runs out of fuel? Choose all that apply. A. Its core becomes a white dwarf B. Its outer layers form a nebula, or vast cloud of gas and dust C. its outer layers expand, and the star becomes a red giant D. gas and dust in a ...

Science please help :)?
3. which if the following factors determines how long a star will live ? ( 1point ) A . star’s color b. the star’s mass**** c. the star’s diameter d. the star’s distance from the sun 4 . which of the following causes constellations to appear to move throughout the ...

science
name two ways that air gets heated

SCIENCE
2. which of the following happens when a low - mass star runs out of fuel ? choose all that apply . ( 3points ) A ITS CORE BECOMES A WHITE DWARF B ITS OUTER LAYERS FORM a nebula , or vast cloud of gas and dust c its outer layers expand , and the star becomes a red giant d. gas...

Science
1. how do scientists classify stars ? (1point ) A. by size , distance , and color b. by size , distance, and brightness c. by color , brightness, and distance d. by size , brightness, and temperature

Science
How will you triple volume of an ideal gas in value? Please explain your answer using the ideal gas law (PV = n RT). I figure that you simply multiply everything by three but Im not 100% that's correct.

Science
Factors that can be changed in an experiment

science
A person sits in a chair 3m from a wall on which hangs a plane mirror.Three meters directly behind him stands a woman 1.6m tall.What minimum height of plane mirror on the wall will enable him to see the woman's full height?

Science
Animals with nerve nets have: A:No specialized neurons B:Sensory neurons but n inter neurons C:Inter neurons but no sensory neurons D:Only motor neurons

material science, math
Calculate the ratio of the moments of inertia I1/I2 of two beams of rectangular cross section of the same width, one with a height h and the other, made up of three thinner beams of height h/3. I1/I2 = ?

science
If your primers are 25 bases in length and are located at position 520 and 1240 in your sequence, how big a PCR product do you expect? The location positions are for the 3' end of the primers.

physical science
why the speed of sound is faster in solids than in gases.

Science
1.)A couple has just learned that their daughter has hemophilia. They already have a son who does not have the disease. What are the genotypes of the couple? Explain your reasoning. ANWSER:They are both likely carriers of the disease, therefore they'd have the recessive gene ...

physical science
hermal conductors don’t have to be hot to transfer heat. According to Ch.16, explain a situation when an ice cube would still transfer heat to another object it is in contact with.

physical science
Explain how the snowboarder can have both kinetic and potential energy at point B.

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
Explain how you can use Boyle's law to determine the new volume of a gas when it's pressure is increased from 270 kPa to 540 kPa? The original volume of gas was 1 l. Assume the temperature and number of particles are consistent. What is the new volume?

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