Science

Recent Questions

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
Fill in the blank with the word or phrase that best completes the statement or answers the question. 14. The scientific name for a plant that reproduces with flowers is a(n) (1 point) angiosperm* 15. At certain times of the year, the male sage grouse can be seen inflating the ...

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?

physcial science
If a step-up transformer has a primary coil with 15 turns, how many turns would be required in the secondary coil in order to increase the voltage from 80 volts to 160 volts? A. 8 turns B. 30 turns C. 80 turns D. 160 turns

physcial science
A transformer has a primary coil with 600 turns and a secondary coil with 300 turns. If the output voltage is 320 volts, what is the input voltage? A. 8 volts B. 150 volts C. 640 volts D. 600 volts

physcial science
What creates a magnetic field? A. charged particles that do not move B. moving electric charges C. gravity D. an isolated magnetic pole

physcial science
A device that changes mechanical energy to electrical energy by rotating a coil of wire through a magnetic field is called a(an) A. transformer. B. generator. C. electromagnet. D. current meter.

SCIENCE HELP ASAP
1 . What is the major difference between ectotherms and endotherms? A. whether or not the animal builds nests on land B. whether or not the animal has been found on several continents C. whether or not the animal maintains a constant body temperature D. whether or not the ...

science
Red car is A. Blue car is B. The Blue car is slower than the A. The Red car starts at a starting point 40m behind the Blue at what point do they meet?

physcial science
Which of the following statements about Ohm’s Law is true? A. Increasing the voltage decreases current. B. Keeping the same voltage and decreasing resistance decreases the current. C. Ohm’s law relates power, current and resistance. D. To increase the current, decrease the...

physcial science
What type of current is produced by a battery? A. parallel current B. alternating current C. direct current D. potential current

physcial science
The type of current in your home is mostly A. direct current. B. alternating current. C. series current. D. produced by batteries.

Science
1.)Studies conducted in england during the industrial revolution have shown that children born to poor families were, on average, shorter than those born to wealthier parents. The most likely expalanation for this difference in hieghts is a difference in A.)Nutrition B.)Family...

Science
Compute the number of grams if there are 10.7g of c2h6 in complete combustion

Science
The speed of a motorcycle increases from 10.0 km/hr to 50.0 km/hr in 9.0 seconds. What is the acceleration?

Science
What is the average for 4cm 5cm and 5cm

science
A solid spherical ball rolls on table. Ration of its rotational kinetic energy to its total kinetic energy.

science
Which of the following is an example of inbreeding? A) a farmer chooses the cos in his or her herd that produce he most milk and breeds only those cows. b) a farmer chooses the cows in his or herd that produces the most milk and breeds them with cows that get sick less often. ...

science
Studies conducted in England during the industrial revolution have shown that children born to poor families were, on average, shorter than those born to wealthier parents. The most likely explanation for this difference in height is a difference in A) nutrition b) family size...

Science
What is the difference between the density of cold water and the density of hot water.. Explain using the particle theory of matter. Thank You......

SS HELP PLZ
Which statement describes the thinking of the enlightenment? A. The power of reason is more important. B. Scientific ideas must fit religious beliefs. C. Only god knows how the world works. D. Faith is more important than science plz help

Science
Which of the following factors does not vary between a fast-following river and a pond that receives no water input? a. oxygen levels b. salt concentration*** c. temperature d. fish species Plzzz help me:)

phPhysical Science
A bird flew16 km west in 5 hours, then flew 20 km east in 6 hours. What was the bird’s velocity?

Geo, Math lit, Life science, history
Which career will I be able to do if I study Geography, Mathematical literacy, Life sciences, History, English, setswana and life orientation

science
A circular hole of 150 mm diameter is to be punch out of a 2 mm thick plate. the shear stress needed to cause fracture is 400 Mpa. calculate the minimum force to be applied to the punch.

Statistics
At a certain university, 50% of all entering freshmen planned to major in a STEM (science, technology, engineering, mathematics) discipline. A sample of 36 freshmen is selected. What is the probability that the proportion of freshmen in the sample is between 0.475 and 0.580? ...

Science
Which has a higher gravitational potential energy a mango or a huge boulder falling from the same height with the same acceleration due to gravity

8th Grade Science
How do adaptations enable organisms to reduce competion for food and other resources PLEASE ANSWER BY 4 (50 MINS)

barberton tvet ,science
calculate the maximum height reached by the bullet

Computer Science
Convert the following binary numbers to decimal (6 points): 11111 101011 1101011 Convert the following decimal numbers to binary (6 points): 49 367 1023 Convert the following hex numbers to decimal (4 points): ACE 800 Convert the following decimal numbers to hex (4 points): 64...

gaya ,college science
Which one of the following is an alkaline earth element? a) carbon b)sodium c)zinc d)iron

science
a bullet leaves a rifle with a velocity of 200m/sec and strikes targt up to 4cm what velocity scould it have pierce the same block of wood up to 16cm?

Health science
Make lists of factors that makes your lives stressful and explain how each impacts your physical health and fitness. Please help I'm confused

Science
A block of mass m is placed on a triangular block of mass M Which in turn Placed on a horizontal frictionless Surface find the velocity of the triangular block when the smaller block reaches the bottom end

Science
1. True or False: If the net force of an object is 0 N, the forces are considered unbalanced. (True) 2. Which of the following forces causes a feather to fall slower than a blowing ball? gravity © rolling friction sliding friction air resistance 3. A small fish in the ...

science
For the monatonic gas in #3,estimate the momentum of the gas for a particle mass of 3x10^-4g

Science
Kendell wants to determine if there is a trend in air temperature changes during April. Which procedure should he follow?

science
I have a question from an old exam that I need help to understand, i'm not sure where to start An electron in an electronically excited hydrogen atom undergoes a transition from a 6d to a 2p orbital, resulting in the emission of a photon. The photon strikes a metal surface ...

science
A behavioral adaptation in which animals undergo a period of greatly reduced activity in winter is _____. A. clustes B. hibernation C. burrows D. estivation

science
Which of the following is the key factor driving cellular differentiation in the body? a. chemical gradients in the cellular environment b. expression of genetic coding c. rate of transcription d. cellular nutritional status B or C?

science
In evolutionary terms, RNA is thought to have preceded proteins and DNA. Which of the following provides the most convincing support for this hypothesis? a. there are more types of RNA than there are of DNA b. RNA can both store genetic information and act as an enzyme c. ...

life science
Using examples,describe predation,competition and symbiosis,explaining how each interaction influences the population size of the organisms involed.

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