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March 3, 2015

Homework Help: Science

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Recent Science Questions

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Earth Science
11.   Which earthquake scale takes into consideration the damage caused by an earthquake?  A. Amplitude scale B. Moment magnitude scale C. Richter scale D. Modified Mercalli scale D?
Friday, February 13, 2015 at 8:31pm

Science - Urgent.
What is a electrostatic lifting apparatus? Please help..
Friday, February 13, 2015 at 7:53pm

science
what is an electrostatic precipitator? In simple words please..
Friday, February 13, 2015 at 7:14pm

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 ...
Friday, February 13, 2015 at 5:20pm

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 ...
Friday, February 13, 2015 at 4:53pm

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 ...
Friday, February 13, 2015 at 4:24pm

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?
Friday, February 13, 2015 at 3:41pm

Science
1. Which layer of the sun's atmosphere are you looking at when you look at an image of a sun? A) Photosphere B) Chromosphere C) Corona D) Prominence 2. What materials could have been found in a giant cloud that formed the solar system? A- hydrogen and helium B- hydrogen ...
Friday, February 13, 2015 at 1:06pm

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
Friday, February 13, 2015 at 11:54am

Science
What hormone is the adrenal medulla responsible for secreting?
Friday, February 13, 2015 at 11:48am

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 ...
Thursday, February 12, 2015 at 11:39pm

Earth Science
Could I have some help with the question down below?
Thursday, February 12, 2015 at 10:57pm

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!
Thursday, February 12, 2015 at 10:33pm

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
Thursday, February 12, 2015 at 10:03pm

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
Thursday, February 12, 2015 at 9:57pm

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
Thursday, February 12, 2015 at 9:44pm

Science
What is the first activity of the digestive system?
Thursday, February 12, 2015 at 9:41pm

Science
In humans having dimples is a dominant trait. in order for a child to have dimples...? I dont know D: xD
Thursday, February 12, 2015 at 9:02pm

Science
ranging minerals from the hardest to the softest. Chalk, fingernail. steel screw and paper clip
Thursday, February 12, 2015 at 7:35pm

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.
Thursday, February 12, 2015 at 6:27pm

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...
Thursday, February 12, 2015 at 5:55pm

Science
describe how mutation might might have influenced the development of different species of finches that darwin observed on the galapagos islands
Thursday, February 12, 2015 at 5:43pm

Science
What is the pattern with these fractions 1/4 1/9 1/16 1/25
Thursday, February 12, 2015 at 5:36pm

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 ...
Thursday, February 12, 2015 at 5:23pm

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...
Thursday, February 12, 2015 at 4:54pm

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
Thursday, February 12, 2015 at 4:00pm

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 ...
Thursday, February 12, 2015 at 3:40pm

computer science
Please , help me i dont 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.
Thursday, February 12, 2015 at 3:22pm

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/...
Thursday, February 12, 2015 at 2:32pm

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
Thursday, February 12, 2015 at 2:07pm

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
Thursday, February 12, 2015 at 2:07pm

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
Thursday, February 12, 2015 at 2:04pm

science
what happens when two objects of unequal masses collide?
Thursday, February 12, 2015 at 11:23am

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...
Thursday, February 12, 2015 at 9:29am

computer science
Draw a flowchart to print the first N even positive integers and print the sum.
Thursday, February 12, 2015 at 8:28am

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 ...
Wednesday, February 11, 2015 at 11:48pm

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....
Wednesday, February 11, 2015 at 11:07pm

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
Wednesday, February 11, 2015 at 10:47pm

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
Wednesday, February 11, 2015 at 10:24pm

Science!!!
Two people are pushing a couch from opposite sides. One person is pushing to the right with a force of 3 N. The other person is pushing to the left, with a force of 4 N. Which of the following Best describes the movement of the couch? A. The couch will move to the left with a ...
Wednesday, February 11, 2015 at 10:06pm

science
can someone explain the life cycle of the animalia kingdom???
Wednesday, February 11, 2015 at 10:01pm

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 ...
Wednesday, February 11, 2015 at 9:49pm

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 ...
Wednesday, February 11, 2015 at 9:48pm

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
Wednesday, February 11, 2015 at 9:36pm

Science
Are there more hours of daylight in the summer than in the winter
Wednesday, February 11, 2015 at 9:12pm

Science!!!
Which of the following Best describes the movement of an object at rest if no outside forces act on it? A. It will move due to inertia. B. Gravity will eventually cause it to move. C. It will stay at rest due to inertia. D. It will stay at rest due to gravity. Is the answer C...
Wednesday, February 11, 2015 at 9:11pm

science
what is true about red blood cells
Wednesday, February 11, 2015 at 9:04pm

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
Wednesday, February 11, 2015 at 8:59pm

Science
What do angiosperms produce in order to protect their seeds?
Wednesday, February 11, 2015 at 8:50pm

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.
Wednesday, February 11, 2015 at 7:35pm

science
If we added more mass to the blocks of wood during these lessons,how would that have changed the experiment?
Wednesday, February 11, 2015 at 7:25pm

science
can someone explain the life cycle of the animalia kingdom please
Wednesday, February 11, 2015 at 6:52pm

Science
Describe how evolution and extinction are related.
Wednesday, February 11, 2015 at 6:49pm

Science
The function of the magnified structure shown in the image below is __________ exchange?
Wednesday, February 11, 2015 at 6:35pm

science
describes the movement of an object at rest if no outside forces act on it? a; it will move due to inertia b; gravity will eventually cause it to move c; it will stay at rest due to inertia d; it will stay at rest due to gravity ----------------------------------------​...
Wednesday, February 11, 2015 at 6:01pm

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 ...
Wednesday, February 11, 2015 at 5:48pm

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 ...
Wednesday, February 11, 2015 at 4:29pm

science
1.explain why most refrigerators are painted with a white shiny colour.
Wednesday, February 11, 2015 at 12:22pm

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?
Wednesday, February 11, 2015 at 11:49am

physical science
how much energy is required to lower the temperture of 450g of sand from 60 celsius to 15 celsius
Wednesday, February 11, 2015 at 9:06am

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
Wednesday, February 11, 2015 at 6:41am

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
Wednesday, February 11, 2015 at 3:02am

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
Wednesday, February 11, 2015 at 12:18am

Science
What is the same in two isotopes of an element? What is different?
Tuesday, February 10, 2015 at 9:53pm

Science
What is te same in two isotopes of an element? What is different?
Tuesday, February 10, 2015 at 9:51pm

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
Tuesday, February 10, 2015 at 8:40pm

science
what type of eclipse would you expect to see if the moon passes directly between earth and the sun
Tuesday, February 10, 2015 at 6:09pm

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, ...
Tuesday, February 10, 2015 at 1:47pm

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...
Monday, February 9, 2015 at 8:52pm

science
What happens when a charged object (plastic) is brought close to another oppositely charged object (glass).
Monday, February 9, 2015 at 8:42pm

science
is this an open or closed system? baking soda reacting with vinegar
Monday, February 9, 2015 at 6:43pm

Basic science
What is the uses of (caco3)
Monday, February 9, 2015 at 4:53pm

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
Monday, February 9, 2015 at 3:37pm

science
A marathon race is 26.22 miles. How many kilometers do the runners run?
Monday, February 9, 2015 at 9:22am

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
Monday, February 9, 2015 at 5:04am

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...
Monday, February 9, 2015 at 2:17am

science
i need help with a reason for the season science lab of how earth orbits sun
Sunday, February 8, 2015 at 11:45pm

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...
Sunday, February 8, 2015 at 11:10pm

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
Sunday, February 8, 2015 at 5:21pm

science
write the formulea for combining sodium and water balance the equation
Sunday, February 8, 2015 at 4:53pm

Science
What are some effects of predation?
Sunday, February 8, 2015 at 3:33pm

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
Sunday, February 8, 2015 at 12:34pm

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?
Sunday, February 8, 2015 at 11:27am

Maths, consumer studies, CAT, life science,
Which careers can i persue with those subjects?
Sunday, February 8, 2015 at 8:33am

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 !
Saturday, February 7, 2015 at 10:15pm

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
Saturday, February 7, 2015 at 8:21pm

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, ...
Saturday, February 7, 2015 at 6:23pm

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.
Saturday, February 7, 2015 at 5:17pm

science
what are the different types of infections that Ecoli causes?
Saturday, February 7, 2015 at 3:01pm

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 ...
Saturday, February 7, 2015 at 12:29am

Science
California's volcanoes formed as the result of what type of plate boundary?
Friday, February 6, 2015 at 10:59pm

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
Friday, February 6, 2015 at 9:30pm

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 ...
Friday, February 6, 2015 at 9:52am

Maths, Life Science, Geography, Business Studies
What career opportunities are open for me regarding the above subjects?
Friday, February 6, 2015 at 5:57am

Science
Given the following balanced equation, determine the rate of reaction with respect to [O2]. 2 SO2(g) + O2(g) → 2 SO3(g)
Thursday, February 5, 2015 at 9:56pm

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?
Thursday, February 5, 2015 at 9:55pm

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.
Thursday, February 5, 2015 at 8:40pm

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...
Thursday, February 5, 2015 at 8:32pm

Science
Does air pressure affect species survival?
Thursday, February 5, 2015 at 5:29pm

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 ...
Thursday, February 5, 2015 at 4:11pm

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