Science

Recent Questions

Computer Science
Define a language that is not a regular language using a context-free grammar that is not ambiguous. The alphabet of the language must contain at least five characters. Describe in English the strings of the language. Choose any string that is in the language and demonstrate ...

science
A tower is 24m high. A stone is projected upwards from the tower with initial velocity of 24,5 m/s. Calculate how long it would take for the stone to reach the ground at the foot of the tower.

SCIENCE:BIOLOGY>
1. How many seconds do you spend in school during the week (6.5 hours/day)? 2. How many micrograms are in 12 dekagrams? 3. How many centimeters are in 5 kilometers? 4. 3.25 liters are equal to how many kiloliters? 5. how man meters are in 0.65 hectometers? 6. How many grams ...

Science independent variable
A scientist designed an experiment to test the effect of temperature on bacterial growth. He grew three different cultures of the bacterium E. coli under three heat lamps at different temperatures. What was the independent variable in this experiment?

Science
Which of the following is not a model? A.An ant farm B.A bicycle C.An atlas D.A plastic human skeleton Is the answer B?

science
A 24 V battery of internal resistance 4 ohm is connected to a variable resistor. At what value of the current drawn from the battery is the rate of heat produced in the resistor is maximum?

understanding motion science
it takes a runner 10 seconds to run 100 yards. the runners speed is ?

Science
The inner planets- Mercury, Venus, Earth and Mars- were formed by a. Supernovas b. repeated collisions of asteroid sized debris (My Answer) ****** c. masses of cold hydrogen and helium d. collisions of large galaxies

physical science
If the volume of a piece of oak is 12 cm3, what's its mass?

Science
Calculate the area, with the appropriate number of significant figures, of a recotangular room that is 14.10 m wide by 15.0 m long. A.212 m^2 B.211.5 m^2 C.29.1 m D.29.10 m Is the answer B?

Science
A student measures the volume of a liquid and finds it to be 40 mL. How many significant figures are in the measurement? A.1 B.2 C.3 D.4 Is the answer B?

science
A point charge of -4 mu or micro CC is located at x = 4 m, y = -2 m. A second point charge of 12 mu or micro CC is located at x = 1 m, y = 4 m. (a) Find the magnitude and direction of the electric field at x = -1 m, y = 0. I got 4545.69 N/C by using this equation E= kQ/r^2 (...

Maths,Physics,life science,geography,
An airplane lands with a velocity of 100 m.s. The maximum rate at which it can slow down is 5,0 m.s 1. What is the minimum time needed to come to rest, starting from when it first touches the ground? 2. Can this plane safely land at a small airport where the landing strip is 0...

Science Check PLEASE
put ** by the ones I thought correct Which of the following statements best describes the characteristics of a hypothesis, one of the steps of the scientific method? a)It is a possible answer to a scientific question *** b) It is a scientific inquiry that cannot be tested c)...

science
significant figure ¹.25×0.05meters what is the correct answer

science
a hemisphere container is made with the following dimensions. the external diameter of the container is 12 cm. the internal diameter of the container is 6 cm. it is filled with water to the brim. what is the density of the empty container if the total mass of the container ...

Science Check answers please
I put ** by the ones I thought correct Which of the following statements best describes the characteristics of a hypothesis, one of the steps of the scientific method? a)It is a possible answer to a scientific question *** b) It is a scientific inquiry that cannot be tested c)...

science, physics
Calculate the final temperature. Two kg ice at zerodegree celsius is mixed with 8 kg of water at 20 degree celsius.

science
A particle leaves the origin with a speed of 2.4 times 106 m/s at 38 degrees to the positive x axis. It moves in a uniform electric field directed along positive y axis. Find Ey such that the particle will cross the x axis at x = 1.5 cm if the particle is an electron.

science
How many calories are in a food that contains .100 grams of CHO . 20 grams of protein . 20 grams of fat What percentage of the total calories comes from: . CHO .Protein .Fat

science
How many calories are in a food that contains .100 grams of CHO . 20 grams of protein . 20 grams of fat

Science(density)
A brick of salt has a volume of 50cm^3 and a mass of 100 grams. What is its density? Show all calculations.

science
derive second equation of motion.S=ut+1/2at2 graphycally where the symbols have their usual meanings.

Science
What do you learn in 7th grade science

science
Scientists performed an experiment to determine whether there is a connection between learning ability and food. They took two groups of 20 mice each, all from the same purebred strain. The mice were deprived of food for 3 days and then given a standard learning session in ...

science
Compute the density in g/cm3 of a piece of metal that has a mass of 0.345 kg and a volume of 59 cm3

Chemistry Science
calculate the mass of carbon dioxide that would be produced when one gas of tank of gasoline (use octane) is burned in the air. assume an 80 liter gas tank and 0.703 g/ml as the density of octane

Physical Science
How many satellites are used for transmitting GPS signals?

Physical Science
The polar circumference of Earth is 40,000km. What distance corresponds to a change of one degree of latitude? A change of one one arcminute of latitude? Hint, an arcminute is 1/60th of a degree.

Physical Science
Standard GPS receivers are accurate to about one hundredth of an arcminute of latitude. What distance does this correspond to?

Physical Science
If six blocks of wood were cut from the same board , would all the pieces of wood have the same density?

Physical Science
Do wood float in gasoline and water?

Physical Science
An 84.9 kg man is standing on a frictionless ice surface when he throws a 2.00 kg book at 11.1 m/s. With what velocity does the man move across the ice?

Science
Why do scientists use standard units of measurement? A.Because their tools only measure in these units. B.Because other units are either too small or too large to work with. C.So they can communicate findings without confusion. D.So that people who are not scientists cannot ...

Physical Science
What is the weight of a 4.82 kg backpack in Newton and the acceleration of the backpack if a net force of 10.0 N is applied in m/s2?

Science
A.) A runner is jogging at a steady 6.7 km/hr. When the runner is 3 km from the finish line, a bird begins flying from the runner to the finish line at 20.1 km/hr (3 times as fast as the runner). When the bird reaches the finish line, it turns around and flies back to the ...

science
why ch3cn act as both electrophile and nucleophile?

science
The chef has 50 pounds of strip loin. The trim loss on the strip loin is 60% and the cooking loss is 20% of the trimmed weight. How many pounds of trimmed, cooked strip loin will the chef have left to serve to his customers?

Science
A star's life depends on mass ___ mass=Long life Large mass= ____ life Small mass is long life and large mass is short life?

science
When a test charge q0 = 9 nC is placed at the origin, it experiences a force of 8 times 10-4 N in the positive y direction. (c) If this force is due to a charge on the y axis at y = 3 cm, what is the value of that charge? so in a I found E to be 88888.889 in b I found the F on...

science
how do you calculate the missing variable in work and power;example:you must exert a force of 4.5N on a book to slide it across a table .if you do 2.7J of work in the process,how far haveyou moved the book

Science
Having scientic literacy involves being able to? A. ask scientific qustions. B. evaluate scientic information. C. understand scientific terms. D. all the above. i think C.

science
A particle beam is made up of many protons each with a kinetic energy of 3.25times 10-15J. A proton has a mass of 1.673times 10-27kg and a charge of +1.602times 10-19C. What is the magnitude of a uniform electric field that will stop these protons in a distance of 2 m? I am ...

Science in motion pHY 102
Find the net force produced by a 30-N force and a 20-N force in each of these cases: (a) Both forces act in the same direction. The net force produced by 30-N force is 60-N The net force produced by 20-N force is 40=N Applied Forces Net Forces 30-N = 60-N 30-N

Science
Which of the following best describes a scientific theory? A.A scientific theory is a rule of nature that can never be changed. B.A scientific theory is an educatrd guess about the possible results of an experiment. C.A scientific theory is a description of a pattern of ...

Science
An environmental group claims that a local chemical plant is polluting a nearby river. They are calling for a shutdown of the chemical plant. What evidence would help you the most in evaluating their claim? A.A repeated study that shows chemicals produces by the plant are in ...

Science
help fastwhich of the following statements incorrectly describes a tool used by scientists? A. A compound light microscope enables a scientist to view objects too unaided eye to see. (B).A beaker is a type of glassware a scientist uses in the lab to record data. C. A scale is ...

science
_______ describes all the processes associated with the discharge of magma, hot fluids, ash, and gases.

science
116In nuclei are produced at the rate of 10 s-1. Calculate the maximum number of 116In nuclei (number in equilibrium) in the sample if the half-life of 116In is 54 m. So far I have come up with ... The half life = 54m x 60 s-1 = 3.24 x 103 s-1 (In2) / λ = In2 / 3.24 x 10^...

Science
which of the following statements incorrectly describes a tool used by scientists? A. A compound light microscope enables a scientist to view objects too unaided eye to see. (B).A beaker is a type of glassware a scientist uses in the lab to record data. C. A scale is used to ...

Science
which statement best describes the benefit of having a universal system of measurement? A. Scientists from different counties can more easily shared and compare data from experiment. B. Scientists who speak difference languages do not have to translate each others work into ...

Science
which statement best describes the benefit of having a universal system of measurement? A. Scientists from different counties can more easily shared and compare data from experiment. B. Scientists who speak difference languages do not have to translate each others work into ...

science
Mary is driving on a straight road. Suddenly a deer jumps out in front of her. Mary turns her car to the left to avoid the deer. Which best describes what happens to mary's head position if she is wearing her seatbelt? A) mary's head moves to the left b marys head moves to the...

7th grade Science
Can you help me figure out the manipulated , responding, & controlled variables in the following? Walker wanted to test how weight of a paper airplane affected the distance the airplane flew. he stood at the starting line and threw the airplane. He measured how far the paper ...

Science
What are legs when using them to push a heavy weight?

Science
which statement best describes the benefit of having a universal system of measurement? A. Scientists from different counties can more easily shared and compare data from experiment. B. Scientists who speak difference languages do not have to translate each others work into ...

Science
which of the following describes scientific inquiry?(1 point) A.a statement that describes what scientists expect to happen in experiment. B.facts,figtures,and other evidence gathered through observation. (C).the diverse ways in which scientists study the natural world. D.a ...

Science
which of the following describes scientific inquiry?(1 point) A.a statement that describes what scientists expect to happen in experiment. B.facts,figtures,and other evidence gathered through observation. (C).the diverse ways in which scientists study the natural world. D.a ...

Math, Science, Sociology, Economics
Math: What is the answer to 1146(150+X)+8911(743+19X) Science: What is photosynthesis? Sociology: What is figuration and functionalism? Economics: What is Opportunity cost? Why is it relevant to life?

Science
If an experiment disproves a scientists hypothesis, what should the scientist do next? A. develop a testable question B. revise the hypothesis and try the experiment again. C. develop a theory based on the data gathered in the experiment D. change the dependent variable. Is ...

Science
Which of the following is not a model? A. an ant farm B. a bicycle C. an atlas D. a plastic human skeleton I think B is the answer am I correct?

Science
Turning on the switch in a flashlight starts a chemical reaction in the batteries. The chemical energy is turned to light energy and the flashlight lights up. Which part of this system is an example of a process? A. Turning on the switch is a process. B. The conversation of ...

Science
1. How is a model of an atom different from a real atom? A. A model of an atom is not as big as an actual atom. B. A model of an atom is the same as a real atom. C. A model of an atom is more complex than a real atom. D. A model of an atom is not as small as an actual atom. I ...

English
Identify the word that best describes the bolded word. The interviewer REMAINED speechless upon hearing about the senator's revelations. A.) linking verb********* B.) action verb C.) auxiliary verb D.) transitive verb FEW people know about the complex science behind the ...

Science
Which of the following identifies a measurement, its SI unit, and the tool most commonly used to measure it? a) lenght, meter, ruler b) temperature, degrees fahrenheit, thermometer c) weight, gram, scale d) volume, milimeter, meiscus The answer I chose was d. Am I right?

Physical Science
Does wood float in gasoline?

science
100.0g of 4.0c water is heated until its temperature is 37c. if the specific heat of water is 4.18 j/g c, calculate the amount of heat energy needed to cause this rise in temperature.

Physical Science
Write the number represented by 0.9^1900 with both 5 and 1 significant figures.

science
Baby chickens require a constant source of food. As chickens grow, more energy is needed for daily activities. Number of days 0, 1,2,3,4,5,6,7 and food eaten (grams) 0.0, 1.5,3.5,6.5,9.0,12.5,16.5,21.0 What type of graph will you use?

Science
4. The graph above shows jack's mass over a five-month period. Based on the trend in the data, what do you predict will happen to jack's mass the subsequent month? A. Jack's mass will increase(MY ANSWER) B. Jack's mass will decrease C. It is impossible to predict because there...

Physical Science
A planner estimates that a project will take 3.0 years to complete. Write the corresponding number of days with the appropriate number of significant figures (one year is 365.25 days long).

Physical Science
If one measurement is known much more precisely than the other, the fractional error is the ratio of the absolute value of the difference (|M1-M2|), and the more accurate value. What is the percentage error of student A's measurement (37.2 cm long if it is determined by ...

physicsal science
Write the number represented by 0.9^19 with both 5 and 1 significant figures.

Physical Science
If student A measures a laptop computer to be 37.2 cm long, and student B measures 36.7 cm, what is the percentage error?

science
Suppose you were balancing a chemical equation that contained the substance sodium nitrate, NaNO3, composed of a sodium ion, Na+1, and a nitrate ion, (NO3)-1. Could you change any of these numbers in order to balance the equation?

earth science
The process to convert seawater into fresh water is known as

science
why does not refraction occurs on mirrors ????? means in mirror reflection occurs not refracton why??????

Science
An electric bulb is rated 220v-100w.the power consumed by it when operated on 110v will be

Physical Science
Is jelly a element, compound, or a mixture? Is sweet tea a element, compound or a mixture? Is ketchup a element, compound, or a mixture?

Physical Science
How is a compound different from an element?

Earth Science
Please help me with the following question: 8. Observations can lead to hypotheses. Hypotheses can lead to new experimentation. Which best describes an observation and hypothesis that might lead to new experimentation? A. Dr. Sattler discovers a new plant that grows near ...

computer science
Writing a c++ program that stores the following values in five different variables:28,32,37,24,and 33.We have been ask to get the average of the series of values given above. Here I what I got /// This program calculates the sum and average of a series of values #include<...

Phsical Science
Other than familiarity, what is the advantage of the English System of measurement?

Physical Science
The standard unit of length in the metric system is based on what.

Physical Science
A loaf of bread (volume 3200 cm3) with a density of 0.50 g/cm3 is crushed in the bottom of the grocery bag into a volume of 2400 cm3. What is the density of the mashed bread in g/cm3

science
how would a piece of pure silver decrease in density but still be the same temperature? please tell me if that can or cant happen? thx! :)

Earth Science Continued
Please help me with the following questions: 1. John Dalton said that the total pressure (Pt) exerted by a mixture of gases in a container is equal to the sum of the individual pressures of each gas present (if each gas was the only one present in the container). Further ...

science
you have pure silver in your hand and its 10.5 g/cm^3 at 20 degrees celsius. you get handed pure silver that's 9.9g/cm^3 and its also at 20 degrees celsius. what happened?

Physical science
What did svante arrhenius discover about the reaction between an Acid and a Base?

Science
How might creativity help a scientist? a)creativity allows a scientist's findings to be trusted. b)Creativity alllows a scientist to develop new ideas or evaluate old ideas in a new way. c)Creativity assures that the scientist has a sense of right and wrong. d)creativity ...

science
the hydrogen ion concentration in a mixture of 10ml 0.1 M H2SO4 AND 10ml 0.1M KOH solution in water is?

Science
What type of scientific thinking did alfred wegener employ to develop his theory? A.Inductive reasoning B.Deductive reasoning C.Skeptical reasoning D.Subjective reasoning Is the answer A?

Science
How might creativity help a scientist? A.Creativity allows a scientist's findings to be trusted. B.Creativity allows a scientist to develop new ideas or evaluate old ideas in a new way. C.Creativity assures that the scientist has a sense id right and wrong. D.Creativity allows...

ENGLISH
In what year was this article published? In what year was the film Minority Report set? What gaming console does the article mention? Why does the article mention this gaming console? What is the “Star Trek effect,” and how does it relate to what you have learned about ...

waverley girls high school
Which career options do you have if you choose subjects such as geography, maths literacy, business studies and life science ?

Science
An air balloon is at rest in the air and a stone is dropped from it. It passes a 81m tower in quarter of a second and comes on the ground. Find the final velocity and the height of the air balloon.

science
an electron in a one-dimensional box undergoes a transition from the n=3 level to the n=6 level by absorbing a photon of wave length 500 nm. what is the width of the box?

science
what is 50g divided by 8cm3

science & math
for a ray of light incident normally on one face of the prism prace course of the ray measure the delta angle explain briefly do this for prism with angleA=60,45,90

Earth Science Continued
Please help me with the following questions: 1. A scientist suspected that the increase in the acidity of ocean water could have a devastating effect on organisms such as snails because it could break down calcium carbonate, a chemical that makes up their shells. Which could ...

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