Thursday
May 28, 2015

Homework Help: Science

Branches of Science

Recent Science Questions

science
In which of the following statement the word light year is used correctly? (A) Ceres dwarf galaxy is 2.46 million lightyear away from us.(B) light travels with the speed of 1 lightyear in the universe (c) the next complete solar eclipse will be seen after 32 light year. (D) ...
Monday, March 16, 2015 at 11:01pm

Science
What kind of substance has properties that reflects light very well, warms up in my hand, flattens out when it hits with a hammer and conducts electricity?
Monday, March 16, 2015 at 6:40pm

science
you are given a 1kg trolley and a trolley of unknown mass.explain how the mass of unknown . Explain how the mass of the known trolley can be determined if a mass-meter scale is not available
Monday, March 16, 2015 at 5:21pm

Science
A horizontal force of 24 N is being applied to a box on a level surface. The box is accelerating at the rate of2280889against a frictional force of 14 N. What is the mass of the box?
Monday, March 16, 2015 at 4:11pm

Science
What is a four-cell battery with the cells connected in series with each other? How would it look like?
Monday, March 16, 2015 at 1:47pm

science help
a 2500kg car moves at 15m/s 2; 15m/s2 is the __________ of the car
Monday, March 16, 2015 at 12:32pm

Science
When a football is kicked into the air, it has a velocity of 32m/s at an angle of 25º. At the very top of the ball’s path, what is it's vertical velocity?
Monday, March 16, 2015 at 9:53am

science
air masses that form over land are moist true or false
Sunday, March 15, 2015 at 4:47pm

Science Help
A projectile is launched at 15 degrees and it's landing height is the same as the launch position. If this is true, then at what other angle can the projectile be launch to achieve the same horizontal displacement?
Sunday, March 15, 2015 at 1:35pm

science
Describe what happens to the electricity produced at 25kV by a power station when its transmitted to a house at 230 V many miles away.
Sunday, March 15, 2015 at 12:23pm

Science
A dicot seed is preferred over a monocot seed to observe seed structure because? a.Distinct embryonic axis or b.Proper sepration of cotyldeons
Sunday, March 15, 2015 at 9:17am

science
What is the mass of air in a room meauring 30 cubic meters if the density of air is 1.3kg per cubic meter?
Sunday, March 15, 2015 at 2:19am

Science
fus = 12.5 and vap = 93.2 both j/k x mol Determine the entropy change when 7.30 mol of HCL(g) condenses at atmospheric pressure. my first answer was -91.3 but it keeps telling me that is incorrect and that delta Svap if scaled at 1.00 mol but needs to be scaled to 7.30 mol ...
Saturday, March 14, 2015 at 5:10pm

science
3.A weather station is located 300 miles directly east of a second station. Winds at the eastern station are blowing from the south. Winds at the western station are blowing from the north. What is true about the weather system near these two locations? A. A high-pressure ...
Saturday, March 14, 2015 at 3:44pm

science
The passageway that takes air from your throat to your lungs is called the pharynx*** larynx alveoli trachea
Saturday, March 14, 2015 at 1:20pm

SCIENCE(CHEMISTRY)
calculate the mass of silver deposited when a current of 2.6a is passed through a solution of a silver salt for 70mins ag=108,1 faraday 96500
Saturday, March 14, 2015 at 9:22am

Science
Which of the following may have happened if the inner planets had greater masses during the formation of the solar system? A. The inner planets may have been even smaller and rockier. B. The inner planets may have been larger and more gaseous. C. The inner planets may each ...
Friday, March 13, 2015 at 11:26pm

science
Calculate the average speed of a water molecule (with a mass of 3.0e-26 kg) on the surface of Venus (730 Kelvin).
Friday, March 13, 2015 at 8:50pm

Science
Which of the following planets is considered a rocky, or terristrial, planet? A. Venus B. Neptune C. Saturn D. Uranus Is the answer A? Thank you
Friday, March 13, 2015 at 7:02pm

Science
Why is photosynthesis an example of a chemical reaction, and why is it classified as endothermic?
Friday, March 13, 2015 at 4:58pm

science
How many sex chromosomes are found in the reproductive cells of human being?
Friday, March 13, 2015 at 1:23pm

science
A charge of +9.0 nC and a charge of +4.0 nC are separated by 50.0 cm. Find the equilibrium position for a −1.0 nC charge as a distance from the first charge. The Coulomb charge is 8.98755 × 109 N · m2 /C 2 . Answer in units of cm.
Friday, March 13, 2015 at 1:11pm

science
14. the sun's layer is called the photosphere . ( 1point) A. true b. false 15. meteoroids can form when comets break apart , creating dust clouds . ( 1point ) A. true b. false 16. a star is born whenever a nebula expands . ( 1point ) A. true b. false 17. a star system has ...
Friday, March 13, 2015 at 12:43pm

Science Help Please
Marie and Pierre noticed burns on their fingers after handling test tubes containing radioactive substances. This observation led to A. the discovery of natural fluorescence. B. the discovery of X-rays. C. the discovery of radiation therapy. D. the discovery of uranium. Is the...
Friday, March 13, 2015 at 12:12pm

Science Help Please
Marie and Pierre noticed burns on their fingers after handling test tubes containing radioactive substances. This observation led to A. the discovery of natural fluorescence. B. the discovery of X-rays. C. the discovery of radiation therapy. D. the discovery of uranium. Is the...
Friday, March 13, 2015 at 11:50am

Science Help Please
1.A weatherman reports, “The storm waves are about 2 meters high and about 35 meters apart.” What properties of waves is the reporter describing? (1 point) A.frequency and wavelength B.wavelength and wave speed C.amplitude and wavelength *** D.amplitude and frequency...
Friday, March 13, 2015 at 11:34am

science
calculate the net force on an object that has a mass of 12kg and acceleration of 4m/sec
Friday, March 13, 2015 at 10:10am

Science Help Please
1.A weatherman reports, “The storm waves are about 2 meters high and about 35 meters apart.” What properties of waves is the reporter describing? (1 point) A.frequency and wavelength B.wavelength and wave speed C.amplitude and wavelength *** D.amplitude and frequency...
Friday, March 13, 2015 at 9:25am

Science Help Please
A weatherman reports, "The storm waves are about 2 meters high and about 25 meters apart." What properties of waves is the reporter describing? A. frequency and wavelength B. wavelength and wave speed C. amplitude and wavelength D. amplitude and frequency Is the ...
Friday, March 13, 2015 at 9:16am

Science Help
A projectile that is launched at 15 degrees and the landing height is the same as the launch position. If this is true, then at what other angle can the projectile be launch to achieve the same horizontal displacement?
Friday, March 13, 2015 at 8:15am

Science Help
Soundproof rooms take advantage of which property of waves? A. Absorption B. Regular reflection C. Refraction D. Diffuse reflection Is the answer C? Thank you for your help and time.
Friday, March 13, 2015 at 12:15am

Science - 7th grade (repost)
Can you check my homework? 38. How does natural selection lead to evolution? a. Organisms mutate to adapt to their environment. b. Helpful traits accumulate among surviving members of the species. c. Overproduction provides food for stronger members of the species. d. ...
Thursday, March 12, 2015 at 10:58pm

Science Check
Hi! Can someone check my answers? Thanks!! :) Question 1: A skateboarder (coasting with a constant velocity) jumps straight up. What happens she she lands? Does she come down.... A.) behind the skateboard B.) ahead of the skateboard C.) on the skateboard My answer: B. Question...
Thursday, March 12, 2015 at 8:30pm

Science Please Help Me
5. Which one of the following is not a cause of anemia? a diet lacking in iron and certain vitamins germs from someone with anemia inherited problems relating to red blood cells. loss of a large amount of blood 6. Which of the following carries blood to every part of the body...
Thursday, March 12, 2015 at 7:16pm

Science - 7th grade
Can you check my homework? (don't think I'd posted before) 38. How does natural selection lead to evolution? a. Organisms mutate to adapt to their environment. b. Helpful traits accumulate among surviving members of the species. c. Overproduction provides food for ...
Thursday, March 12, 2015 at 5:41pm

science Please Help Me
5. Which one of the following is not a cause of anemia? a diet lacking in iron and certain vitamins germs from someone with anemia inherited problems relating to red blood cells. loss of a large amount of blood 6. Which of the following carries blood to every part of the body...
Thursday, March 12, 2015 at 5:40pm

Computer Science
You try to run the CHKDSK utility from a command prompt but you keep getting an error message that you need to run it in Elevated Mode. How do you correct this? Reboot the computer in SAFE Mode and then run CHKDSK from a command prompt. Open command prompt from the Windows ...
Thursday, March 12, 2015 at 4:35pm

Science
Can anyone help me find the half-life of strontium-90? I also need an explanation on how to do it. Thanks!! Radioactive Decay of Strontium-90: At 0 years: 100% remaining At 28 years: 50% remaining At 56 years: 25% remaining At 84 years: 10% remaining At 112 years: 5% remaining.
Thursday, March 12, 2015 at 1:58pm

science. mrs.sue please help
14. the sun's layer is called the photosphere . ( 1point) A. true b. false 15. meteoroids can form when comets break apart , creating dust clouds . ( 1point ) A. true b. false 16. a star is born whenever a nebula expands . ( 1point ) A. true b. false 17. a star system has ...
Thursday, March 12, 2015 at 11:03am

Physical Science (H)
A container of milk holds 3640 g of milk. The density of the milk is 1.02 g/mL. What is the volume of the milk in the container?
Thursday, March 12, 2015 at 8:15am

science
What is the difference between apparent and absolute magnitude
Wednesday, March 11, 2015 at 10:03pm

Science - 7th grade
Can you check the following? Experiment A: Four groups of rats are first massed and then fed identical diets except for the amount of vitamin A they receive. Each group gets a different amount. After three weeks on the diet, the rats’ masses are measured again to see if ...
Wednesday, March 11, 2015 at 9:10pm

science
describe 4 different types of satellites
Wednesday, March 11, 2015 at 8:55pm

science
what is a humble telescope
Wednesday, March 11, 2015 at 8:54pm

science
What advantages of space probes
Wednesday, March 11, 2015 at 8:54pm

physical science
most electricity generated in the united states comes from?
Wednesday, March 11, 2015 at 7:20pm

science
What is the difference between apparent and absolute magnitude
Wednesday, March 11, 2015 at 7:07pm

Science
What mass of water is needed to react completely with the Na2O2? Answer in units of g.
Wednesday, March 11, 2015 at 6:59pm

Science
Sodium peroxide reacts vigorously with water to produce sodium hydroxide and oxygen. The unbalanced equation is Na2O2(s) + H2O(ℓ)→ NaOH(aq) + O2(g). What mass of O2 is produced when 81 g of Na2O2 react? Answer in units of g
Wednesday, March 11, 2015 at 6:58pm

science
How long dose it take the moon to rotate once and how many days dose it take to orbit the earth
Wednesday, March 11, 2015 at 6:35pm

Science
Which of the following statements is true about a collison between two cars? The total momentum after the collision is the same as the total momentum befor the collision *** The total momentum after the collision is greater than the total momentum beforethe collision The ...
Wednesday, March 11, 2015 at 6:28pm

science
if you can only see one "north", and the tilt is tilting "south", then its obstructed right?
Wednesday, March 11, 2015 at 6:27pm

Science
After an avalanche, a huge block of a stone slid down a mountain and landed in the middle of a 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. it has a high amount of momentum has balanced ...
Wednesday, March 11, 2015 at 6:25pm

science
Two stunt drivers drive directly toward each other. At time t=0 the two cars are a distance D apart, car 1 is at rest, and car 2 is moving to the left with speed v0. Car 1 begins to move at t=0, speeding up with a constant acceleration ax. Car 2 continues to move with a ...
Wednesday, March 11, 2015 at 6:13pm

science
what is a vector?their structure?
Wednesday, March 11, 2015 at 4:50pm

English
Which statement most accurately contrasts the ideas of different literary periods? A. Anglo-Saxon literature focuses on free will, whereas Renaissance literature suggests that human beings are controlled by fate. B. Literature of the Middle Ages focuses on science, whereas ...
Wednesday, March 11, 2015 at 1:58pm

science
a solid weighs 100g in air 75 g in water and 70 g in oil.find relative density of oil
Wednesday, March 11, 2015 at 12:45pm

language arts
WEDNESDAY March 11, 2015 SCHOOL SUBJECTS Art Business Computers English Foreign Languages Health Home Economics Math Music Physical Education Science Social Studies GRADE LEVELS Preschool Kindergarten Elementary School 1st Grade 2nd Grade 3rd Grade 4th Grade 5th Grade 6th ...
Wednesday, March 11, 2015 at 9:45am

SCIENCE
A SCIENTIST NOTED A POSSIBLE RELATIONSHIP BETWEEN A CERTAIN CHEMICAL SUBSTANCE FOUND IN FISH AND THE OCCURRENCE OF THE KIDNEY FAILURE IN HUMANS. WHICH STEPS SHOULD THE SCIENTIST BEFORE CONDUCTING EXPERIMENT.
Wednesday, March 11, 2015 at 9:25am

Religion
Many Christians seem to accept modern cosmology - Galileo's view that the earth is not the center of the Universe - while at the same time disagreeing with the theory of evolution. For this discussion, we will focus on the following questions (in 250 words total): 1. Why ...
Wednesday, March 11, 2015 at 9:02am

Science Help Please
1. Which of the following correctly describes a radio wave? A. long wavelength and high frequency B. long wavelength and low frequency C. short wavelengh and low frequency D. short wavelengh and high frequency Is the answer B? 2. When the energy of a light wave is transferred ...
Tuesday, March 10, 2015 at 10:24pm

Science
An elevator lifts 5 passengers 30 meters in 24 seconds. The power is 15,000w. What is the total weight of the elevator and passengers?
Tuesday, March 10, 2015 at 8:04pm

physical science
Picnickers see a lightning flash and hear the resulting thunder 9.0 s later. If the storm is traveling at a rate of 15 km/h, then how long, in minutes, do the picnickers have before the storm arrives at their location?
Tuesday, March 10, 2015 at 7:50pm

SCIENCE
hi. Just saying.. I need an answer quick because this is due tomorrow!!! Ok. So, my question was explain the particle theory of why does black objects gets absorbs by heat faster/better? and why does white objects get cooler faster? Thanks And reply as soon as possible!!!!
Tuesday, March 10, 2015 at 6:47pm

science
1.40g each of CO, H2O, and H2 are sealed in a 1.41−L vessel and brought to equilibrium at 600 K. CO(g)+H2O(g)⇌CO2(g)+H2(g)KC=23.2 How many grams of CO2 will be present in the equilibrium mixture?
Tuesday, March 10, 2015 at 4:40pm

science past year
1.1. A resitance of 1.5ohm is connected in parallel with a resistance of 3 ohm. This combination is connected in series with a resistance of unknown resistance of value R. The circuit is then connected acress a 10 V supply. Calculate: 1.1.1. The value of the resistor R when a ...
Tuesday, March 10, 2015 at 2:31pm

Science
which of the following helps ensure a groups access to resources it needs for survival? My answer is D. Territorial Behavior. Please check if this is right?..
Tuesday, March 10, 2015 at 2:19pm

math
Marcus is doing a science experiment in which he measures the rate at which bacteria multiply. Every 15 seconds the bacteria double in number. If there are 10 bacteria now, how many will there be in 2 minutes?
Tuesday, March 10, 2015 at 4:24am

Science
Are all white cells the same? How do you know? Explain.
Monday, March 9, 2015 at 11:26pm

Science
What might happen if the mucus in your nose, throat, and lungs suddenly dried up? Help
Monday, March 9, 2015 at 10:21pm

4th grade Science
why are acids that are found in the stomach and sweat important? HELP
Monday, March 9, 2015 at 10:06pm

4th grade Science
explain how your circulatory and immune systems work together to keep you healthy. Pleaseeeee help!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Monday, March 9, 2015 at 9:25pm

Science (Chemistry)
2. Perform this operation and report the answer to the correct number of significant figures: What is the mass of a cube of aluminum that is 4.0 cm on each edge? The density of aluminum is 2.7 g/cm^3. Show all calculations leading to an answer. (I think I solved this correctly...
Monday, March 9, 2015 at 8:50pm

Science
2. Perform this operation and report the answer to the correct number of significant figures: What is the mass of a cube of aluminum that is 4.0 cm on each edge? The density of aluminum is 2.7 g/cm3. Show all calculations leading to an answer. (I think I solved this correctly ...
Monday, March 9, 2015 at 8:47pm

science
1) What conclusions can be drawn about the relationship between the arrangement of elements on the periodic table and the patterns observed in their properties? :Properties of elements are related to atomic numbers.*** :Properties of elements are related to ductility. :...
Monday, March 9, 2015 at 6:05pm

Science
How do i start of my flow chart? It's about generating electricity
Monday, March 9, 2015 at 5:51pm

Geological Science
What is Groundwater Mining? Explain giving an example of ground water mining in the United States.
Monday, March 9, 2015 at 3:50pm

Science
Zn + 2HCl - ZnCl2 + H2 Assuming the acid was in excess (so all of the zinc reacts), how many mols of hydrogen would you produce?
Monday, March 9, 2015 at 1:30pm

Science
The Periodic Table 1) What conclusions can be drawn about the relationship between the arrangement of elements on the periodic table and the patterns observed in their properties? :Properties of elements are related to atomic numbers.*** :Properties of elements are related to ...
Monday, March 9, 2015 at 12:16pm

Science
Can any one please please help me with popcorn experiment homework? The materials and 1 pack of Orville and 1 movie theater popcorn and let say the timing for both were 4.5 minutes. 1- what is the variables would you need to keep constant(control) in you experiment? Please ...
Monday, March 9, 2015 at 11:22am

physics for physical science
A stone thrown vertically upwards with a speed of 12m/s from the edge of Cliff 70m high. Calculate the time the stone takes to hit the bottom of the cliff.
Monday, March 9, 2015 at 6:58am

SCIENCE
WHAT MASS IN GRAMS OF OXYGEN GAS IS CONTAINED IN C 8.5L TANK AT 32 DEGREE CELSIUS AND 3.23 ATMOSPHERE
Monday, March 9, 2015 at 5:38am

science
What molecule found in the cell membrane serves as a communication molecule as well as involved in active transport?
Sunday, March 8, 2015 at 7:32pm

learning skills
A natural way to reinforce science process skills and introduces the scientific method. This strategy, especially appropriate for primary grades, is to have children do which of the following? A. Begin a collection B. Manipulate objects C. Observe D. Go on field trips my ...
Sunday, March 8, 2015 at 6:27pm

learning skills
According to the text, why should teachers of young children share science activities with parents? A. Everybody should know the facts of science. B. Parents want to learn science. C. Science relates to all aspects of a child's life. D. Parents are their children's ...
Sunday, March 8, 2015 at 6:23pm

5th grade Science
A plastic boat has a mass of 3600g and a volume of 1200cm cubed; what is the density? I figured out the answer to this first ? is 3g/cm cubed I need help with Does the boat float in water? Why or Why not?
Sunday, March 8, 2015 at 5:43pm

Math Ms.Sue
1 Henry spends the day at a ski resort. The total trip riding up the main chair lift and skiing down his favorite trail takes 40 to 50 minutes, depending on whether Henry takes a rest along the trail. He gets on the first chair lift at 8:00 am, he takes a one-hour lunch break ...
Sunday, March 8, 2015 at 5:01pm

Math Help From Anybody
1 Henry spends the day at a ski resort. The total trip riding up the main chair lift and skiing down his favorite trail takes 40 to 50 minutes, depending on whether Henry takes a rest along the trail. He gets on the first chair lift at 8:00 am, he takes a one-hour lunch break...
Sunday, March 8, 2015 at 1:51pm

mathematics,physics,life science,LO,afrikaans
A number of circles are given and the area of the smallest circles is 4π.The area of the next circle is 9/4 times of the previous circle.if there are 6 circles,determine the length of the diameter of the last circle.
Sunday, March 8, 2015 at 11:46am

Physical science
Two rectangular blocks are stacked on a table. The upper block has a mass of m2 and the lower mass is m1 > m2. The coefficient of kinetic friction between the lower block and the table is ųk. The coefficient of static friction between the two blocks is ųk. A ...
Sunday, March 8, 2015 at 7:55am

Science
When the energy of a light wave is transferred to a particle and causes it to vibrate and generate heat the energy of the light wave is A. Absorbed B. Reflected C. Refracted D. Transmitted Is the answer A? Thank you
Saturday, March 7, 2015 at 8:02pm

science
A construction worker is using his weight to keep a stationary stack of wooden beams from falling. If the construction worker uses 689.0 N of force to hold 10 beams stationary against a wall, how much work does he do? (1 point) 0 J 0.0150 J 68.9 J 6,890 J is it a. someone help me
Saturday, March 7, 2015 at 2:25pm

Computer Science
For this task you will create a program that prints out a user-specified string. Then, on the next line, it prints out the string again, all except the last character. It continues printing the string with one less character on each line, until the last line has only the first...
Saturday, March 7, 2015 at 2:02pm

Maths literacy,life science,physical science,consu
what career I can follow with this subjects?
Saturday, March 7, 2015 at 1:16pm

Maths literacy,life science,physical science,consu
what careers I can follow with this subjects?
Saturday, March 7, 2015 at 1:08pm

Science
When a positively charged object moves in the same direction as the electric field, the electric potential energy A. becomes zero B. Decreases C. stays the same D. Increases.
Saturday, March 7, 2015 at 12:05pm

SCIENCE
How many calories of heat do you need if you want to raise the temperature of 310 g of gasoline from 17.0°C to 24.0°C? Specific heat of gasoline is 0.40 cal/g·°C.
Friday, March 6, 2015 at 11:03pm

science
Why don’t all species have the same phenotypes that make the invasive species successful?
Friday, March 6, 2015 at 8:31pm

science 1 question
hi, this is one question in a test, i might post more. in the heart blood flows from the right atrium to the right ventricle where it is pumped to the...? What? I'm pretty sure this is easy, i'm just stumped-_-
Friday, March 6, 2015 at 6:32pm

Science
How does one substance become positively and other other negatively? It's about static electricity. I know when you rub two objects together, one will become positive and the other will become negative but how? Does it lose electrons..?
Friday, March 6, 2015 at 5:45pm

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