Science

Recent Questions

Science
What is the primary reason for the trend in atomic radius going from left to right across the periodic table? 1.All atoms in a given period of the table are the same size because the same main energy level is being filled. 2.There is no clear trend, the atoms all have ...

Science
The Body's Transport System 1) Which of the following is not a function of the circulatory system? :Breaks down large molecules*** :Delivers oxygen to body cells :Takes carbon dioxide away from body cells :Fights infection 2) Which of the following explains why the heart is ...

Science
1.The Bohr model of the hydrogen atom is best described as: 1. A large lump of chocolate chip cookie dough with electrons as the chocolate chips; those of higher energy are on the outside surface of the lump 2. Similar to Saturn with electrons of varying energies in a single ...

Earth Science
5.   Most tornadoes carry wind speeds that range from  A. 105 to 177 km per hour. B. 178 to 266 km per hour. C. 267 to 322 km per hour. D. 1 to 105 km per hour. A?

Science
Endocrine glands ________. A. Do not have ducts to carry their product to a surface B. Do not have ducts to retain their product below surface C. Have ducts that carry their secretory product to a surface D. Have ducts to retain their secretory product below surface

Science
What hormone is the adrenal medulla responsible for secreting?

Science
1.Infrared radiation has wavelengths ranging from about 800 nm to 1 mm. What is the frequency of radiation of wavelength 970 nm? Answer in units of s−1 . 2.Microwaves, such as those used for radar and to heat food in a microwave oven, have wavelengths greater than about ...

Earth Science
Could I have some help with the question down below?

Earth Science
18.   How many chemical reactions are possible regarding the formation of carbonic acid and the dissolving of calcite?  A. 23 B. 10 C. 2 D. 3 I am stuck on this I looked in my text book and it shows the words but not the number answers!

science
The flowerpot weighs 5 pounds on Earth and 0.29 pounds on Pluto. Which proportion could you use to calculate a 115-pound person’s weight on Pluto? A. 5 over 0.29 = 115 over w B. 0.29 over 5 = w over 115 C. 5 over 0.29 = w over 115 D. either A or B

science
The same astronaut visited Pluto. His weight on Earth was still 170 pounds, and his weight on Pluto was only 10 pounds. He removed an ice core with a weight of 25 pounds on Pluto. What is the weight of the ice core on Earth? A. 1.5 pounds B. 15 pounds C. 42.5 pounds D. 425 pounds

science
An astronaut who weighed 170 pounds on Earth found that his weight on Jupiter was 400 pounds. He captured an alien that weighed 120 pounds on Jupiter. What is the alien's weight on Earth? A. 34 pounds B. 51 pounds C. 78 pounds D. 283 pounds

Science
What is the first activity of the digestive system?

Science
In humans having dimples is a dominant trait. in order for a child to have dimples...? I don't know D: xD

Science
ranging minerals from the hardest to the softest. Chalk, fingernail. steel screw and paper clip

Science
How does the sporophyte generation of a plant differ from the gametophyte generation? Use the words spores, sperm cells, and egg cells in your answer.

Science
Which of the following is true about diabetes? A. The pancreas overproduced glucose, and so insulin must be injected to reduce glucose levels. B. The pancreas underproduced glucose, and so insulin must be injected to increase glucose levels C. The pancreas overproduced insulin...

Science
describe how mutation might might have influenced the development of different species of finches that darwin observed on the galapagos islands

Science
What is the pattern with these fractions 1/4 1/9 1/16 1/25

Science
How would a woman at an airport staring out of a window at an airplane know that the plane she is watching was moving? A. She could use the plane as a reference point. B. She could use the building behind the plane as a reference point. C. She could use the clouds in the sky ...

Science
Which of the following is true about diabetes? A. The pancreas overproduced glucose, and so insulin must be injected to reduce glucose levels. B. The pancreas underproduced glucose, and so insulin must be injected to increase glucose levels C. The pancreas overproduced insulin...

science
Describe the preparation of 100 mL of 6.0 M HCL from a concentrated solution that has a specific gravity of 1.18 and is 37% (w/w) HCL

science 1 question
Which of the following best explains why it is necessary for the body to eliminate waste? a) to allow the body to maintain a certain size b) to keep the body's internal environment in balance c) to make room for nutrients coming in d) to reduce unpleasant odors is it b or c? ...

computer science
Please , help me i don't know how to draw a flow chart , how it does..ang we given an ass. And i need an example to get others answer. Please illustrate to me the answer of this. Draw a flowchart to print the first N even positive integers and print the sum.

Science
Ball A and Ball B are rolled so that they will collide. Does the data in the table below demonstrate the law of conservation of momentum? Ball A Momentum Before Collision= 3 kg m/s Ball B Momentum Before Collision= 2 kg m/s Total Momentum of Both Balls After COllision- 6 kg m/...

science
Im doing a poster for school and its about when a candle is alight and I don't under stand it could you please help

Science
Which force is pushing the riders in the swings on a swing chair ride out from the center of the ride? A. Free fall B. Gravity C. Momentum D. Centripetal force Is the answer D? Thank you

Science
Air, like other gases, flows from a region with ________. A. Lower pressure to a region with higher pressure B. No pressure to a region with high pressure C. Little pressure to a region with high pressure D. Higher pressure to a region with lower pressure

science
what happens when two objects of unequal masses collide?

Science
1. Which organisms are capable of converting gaseous nitrogen in the air into a form that other living organisms can use? A. Nitrogen-Fixing Bacteria *** B. Denitrifying Bacteria C. Decomposers D. Producers 2. Which step in the nitrogen cycle is accelerated at the beginning of...

computer science
Draw a flowchart to print the first N even positive integers and print the sum.

Science
Ball A Momentum Before collision is 3 kg m/s. Ball B Momentum Before Collision is 2 kg m/s. Total Momentum of Both Balls After Collision is 6 kg m/s Ball A and Ball B are rolled so that they will collide. Does the data in the table above demonstrate the law of conservation of ...

Science Fair Project
Please help anyone!!!!!!!!!!!!!!!!!!!!!!! I need a science project that can be done in 2-5 days but also that can give me a very good mark!!!!!!!!!!!!!!! please reply A.S.A.P.!!!!!!!!!!!!!!!!!! -From a Science Fair Project in need of a project which can be done in 2-5days.B.T....

Science!!!
If a bowling ball hits a wall with a force of 6 N, the wall exerts a force of (blank) back on the bowling ball. A. 0 N B. 3 N C. 6 N D. 12 N Is the answer C? Thank you

Science!!!
Which force is pushing the riders in the swings on a swing chair ride out from the center of the ride? A. Free fall B. Gravity C. Momentum D. Centripetal force Is the answer D? Thank you

science
can someone explain the life cycle of the animalia kingdom???

Science
Why are the days typically hotter in June than in December here in the US? D. Because the United States faces the sun in the summer and faces away from the sun in the winter E.Because the tilt of the Earth causes the sun's rays to be more concentrated in the summer due to the ...

Physical Science PLS HELP
Dana is reading about the best conditions for worm composting. Worm composting involves keeping worms in a bin with vegetable scraps from the kitchen along with other plant waste, and using the soil and drippings they produce to improve gardens. What should she do? Here are ...

Science!!!
A 2,500 kg car moves at 15 m/s^2; 15m/s^2 is the (blank) of the car. A. Acceleration B. Force C. Velocity D. Speed Is the answer D? Thank you

Science
Are there more hours of daylight in the summer than in the winter

science
what is true about red blood cells

science
Two sleds collide and stick together sled a has mass of 140kg and a speed of 17m/s sled b has a mass of 80kg and a speed of 24m/s. There is no friction between the sleds and snow. Will the sleds be motionless after the collision or which one will move the other

Science
What do angiosperms produce in order to protect their seeds?

Science
Describe the flow of blood in the human body, including through each of the four chambers of the heart. Explain how the blood changes as it moves through various locations in the body.

science
If we added more mass to the blocks of wood during these lessons,how would that have changed the experiment?

science
can someone explain the life cycle of the animalia kingdom please

Science
Describe how evolution and extinction are related.

Science
Why are the days typically hotter in June than in December here in the US? A.Beacuse the sun gives off more light and heat in the summer B.Because the Earth is closer to the sun in the summer and farther from the sun in the winter C.because the Earth's tilt causes the sun to ...

Science
1) Which of the following describes the correct sequence of the movement of food during digestion? :Stomach, large intestine, small intestine :Mouth, esophagus, small intestine :Esophagus, stomach, small intestine*** :Small intestine, stomach, large intestine 2) Compare the ...

science
1.explain why most refrigerators are painted with a white shiny colour.

science
when a molecule of water vapro in the air come into contact with a cold can of soft drink, they lose energy, slow down, and form a liquid due to a decrease in what?

physical science
how much energy is required to lower the temperture of 450g of sand from 60 celsius to 15 celsius

science
A golf ball leaves the club 35m/s at an teta of 35 degree above the horizontal . Find a) range b) maximum height reached c) time of flight

science
Through which are the chromosomes, transmitted according to the path of transmission of factors from the parental generation to offspring's as indicated by Mendle? (1) hereditary chapters (2) evolution (3) heredity (4) gametes

science
Through which are the chromosomes, transmitted according to the path of transmission of factors from the parental generation to offspring's as indicated by Mendle? (1) hereditary chapters (2) evolution (3) heredity (4) gametes

Science
What is the same in two isotopes of an element? What is different?

science
what are some experimental uncertainties for the period of a pendulum lab. in this lab we tested if the length of the string (cm) affects the period (sec) of the pendulum

science
what type of eclipse would you expect to see if the moon passes directly between earth and the sun

Science
Select the three words that belong together. To do this, pick oneword from each three sets below. Set 1. Estuary, lake, nertic zone Set 2. Hight salt, intermediate salt, no salt Set 3. Trout, coral, oyster (Choices) 1. Neritic zone, intermediate salt, oyster 2. Lake, no salt, ...

science
1) The force of gravity on the moon is 1/6 the force of gravity on earth. If you had a 1 kg box of cereal on earth which had a weight of 2.4 N, what would its mass be on the moon? why? 2) what is the volume of a textbook with dimensions 21.3 cm, 27.5 cm, 2.9 cm? please help me...

science
What happens when a charged object (plastic) is brought close to another oppositely charged object (glass).

science
is this an open or closed system? baking soda reacting with vinegar

Basic science
What is the uses of (caco3)

science
the process in which an animal's cells use oxygen and digested food molecules to release the energy in food is called 1. breathing 2. cellular respiration 3. diffusion*** 4. gas exchange

science
A marathon race is 26.22 miles. How many kilometers do the runners run?

engineering science n2
A stone with a mass of 6kg is thrown vertically upwards from the top of a building 35m high with a starting velocity of 20m/s. The time it will take to reach its maximum height

Science
I am reviewing for a test and I don't know how to attempt this question. Could someone please work through this problem and then have the general steps that I need to take to solve the question? Here is the question: A rocket expels gases at a rate of 1.30 x 10^3 kg/s with a ...

science
i need help with a reason for the season science lab of how earth orbits sun

Science
I am reviewing for a test and I don't know how to attempt this question. Could someone please work through this problem and then have the general steps that I need to take to solve the question? Here is the question: A rocket expels gases at a rate of 1.30 x 10^3 kg/s with a ...

History
Which of the following types of institutions played a significant role in supporting and disseminating scientific knowledge in the 17th Century? (choose all that apply) a. scientific journals b. royal academies of science c. coffeehouses d. research universities

science
write the formulea for combining sodium and water balance the equation

Science
What are some effects of predation?

science
an electric water pump raises 500 kg of water through a vertical height of 25 m in 50 sec. Calculate the power of electric pump. Take g=10N/kg

science
A nail is driven into a board with an initial kinetic energy of 150 j. If the potential energy before and after the event is the same, what is the change in the internal energy of the board and nail?

Maths, consumer studies, CAT, life science,
Which careers can i persue with those subjects?

science
A solution of 0.200M NaOH (14.0 mL) is mixed with 42.4 mL of 0.170M HNO3. Assuming the final volume is the sum of the initial volumes, what is the molarity of Na+ cation and NO3- anion? I do not know where to start to solved for the molarity of the ions. Please help !

Science
a child mass m slides down a slide 5 m high. the child speed at the bottom of the slide is 3 meters per second. what is the percent of mechanical energy the child has at the top of the slide. converted to kinetic energy

Physical Science
Here are some half-lives for different isotopes of bismuth (Bi): Bi-211 — 2.1 minutes Bi-212 — 60.6 minutes Bi-213 — 45.7 minutes Bi-214 — 19.9 minutes If there are 200 grams of one isotope of bismuth, and after 60.6 minutes there are 100 grams of bismuth, what isotope...

Engineering Science N4
An aircraft is at A and has to drop a bomb on target B. If the aircraft flies at 720km/h at a height of 2km, calculate how ahead from B the bomb will to be dropped.

science
what are the different types of infections that Ecoli causes?

Science
1.What is the genetic code? (1 point) The order of amino acids in proteins makes up the genetic code. The order of amino acids in mRNA makes up the genetic code. The order of nitrogen bases in tRNA makes up the genetic code. The order of nitrogen bases in DNA makes up the ...

Science
California's volcanoes formed as the result of what type of plate boundary?

Science
To determine the acceleration of an object moving in a straight line, you must calculate the change in its stored during each unit of A. Velocity. B. Time. C. Motion. D. Deceleration. Is the answer B? Thank you

Physical science
A 70-kg man and a 50-kg woman are in a 60-kg boat when its’ motor fails. The man dives into the water with a horizontal speed of 3 m/s in order to swim ashore. If he changes his mind, can he swim back to the boat if his swimming speed is 1 m/s? If not, can the woman change ...

Maths, Life Science, Geography, Business Studies
What career opportunities are open for me regarding the above subjects?

Science
Given the following balanced equation, determine the rate of reaction with respect to [O2]. 2 SO2(g) + O2(g) → 2 SO3(g)

Science
If the concentration of AgCl drops from 1.000 M to 0.655 M in the first 30.0 s of the reaction, what is the average rate of reaction over this time interval?

science
A healthy human body maintains a temperature of about 37.00C. Explain how physical, chemical and nuclear processes all contribute, directly or indirectly, to keeping the human body at a constant temperature.

science
A 4.50 g mass resting on a horizontal, frictionless surface is attached to one end of a spring; the other end of the spring is fixed to a wall. It takes 3.6J of work to compress the spring by 13.0 cm. If the spring is compressed, and the mass is released from rest. find a) the...

Science
Does air pressure affect species survival?

Science
2. Express your opinion about which of all the suggested ways of dealing with antibiotic resistance you think are the most important to pursue, support your opinions with reasons. I think this, don't use any antibiotics unless it's your only option, and if you have antibiotics...

Science - chemistry
Hi Im in year 7 and to get a level 6 we have to explain the big idea of energy. Our project is about the reation of iron and sulphur to make iron sulphide. We have been told to explain using the big idea of energy. pls help me asap!!!!

Science
List some of the atmospheric conditions that might be described as weather? What is the purpose of weather on the earth?

Science
Why would a foam cup of hot cocoa stay hot

materials science
what are the two sources of electricity on the atoll of utrik that are not based on fossil fuels?

science
an object was placed into a container of water. the arrow shows that thermal energy is flowing from the water to the object. what is a valid conclusion

Science
Which of the following statements is true about a collision between two cars in the absence of outside forces? A. The total momentum after the collision is the same as the total before the collision. B. The total momentum after the collision is greater than the total momentum ...

science
which of the following could not have happened as a pot of water boiled on the stove?(1 point)

Science
1)What is the relationship between inertia and mass? 2)Jellyfish sometimes squeeze in the side of their bodies.This pushes a stream of water from the back end of their bodies,according to newtons third law of motion,How will this behavior affect the movement of the jelly fish...

Science
After an avalanche, a huge block of stone slid down a mountain and landed in the middle of the road. People in the nearby town had a very difficult time moving it out of the road. The block of stone is difficult to move because A. It has a high amount of momentum. B. Has ...

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