Science

Recent Questions

science
calculate the net force on an object that has a mass of 12kg and acceleration of 4m/sec

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 2. ...

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 answer C?

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?

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.

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. ...

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...

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...

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 stronger ...

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...

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 ...

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.

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 at ...

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?

science
What is the difference between apparent and absolute magnitude

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 ...

science
describe 4 different types of satellites

science
what is a humble telescope

science
What advantages of space probes

physical science
most electricity generated in the united states comes from?

science
What is the difference between apparent and absolute magnitude

Science
What mass of water is needed to react completely with the Na2O2? Answer in units of g.

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

science
How long dose it take the moon to rotate once and how many days dose it take to orbit the earth

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 ...

science
if you can only see one "north", and the tilt is tilting "south", then its obstructed right?

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 ...

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 ...

science
what is a vector?their structure?

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 ...

science
a solid weighs 100g in air 75 g in water and 70 g in oil.find relative density of oil

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.

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 do ...

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 ...

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?

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?

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!!!!

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?

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 ...

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?..

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?

Science
Are all white cells the same? How do you know? Explain.

Science
What might happen if the mucus in your nose, throat, and lungs suddenly dried up? Help

4th grade Science
why are acids that are found in the stomach and sweat important? HELP

4th grade Science
explain how your circulatory and immune systems work together to keep you healthy. Pleaseeeee help!!!!!!!!!!!!!!!!!!!!!!!!!!!!

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...

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 ...

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. :...

Science
How do i start of my flow chart? It's about generating electricity

Geological Science
What is Groundwater Mining? Explain giving an example of ground water mining in the United States.

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?

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 ...

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 ...

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.

SCIENCE
WHAT MASS IN GRAMS OF OXYGEN GAS IS CONTAINED IN C 8.5L TANK AT 32 DEGREE CELSIUS AND 3.23 ATMOSPHERE

science
What molecule found in the cell membrane serves as a communication molecule as well as involved in active transport?

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 ...

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 first ...

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?

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 ...

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...

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.

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 ...

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

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

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...

Maths literacy,life science,physical science,consu
what career I can follow with this subjects?

Maths literacy,life science,physical science,consu
what careers I can follow with this subjects?

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.

science
Why don’t all species have the same phenotypes that make the invasive species successful?

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-_-

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..?

Science
A particular ecosystem in Georgia can support a maximum population of 100 blubirds. Which of the following would allow 120 bluebirds to live together in this ecosystem? -human activity disrupting the nesting habits of a preditor hawk -flooding that decrease the local insects ...

science
if the alleles are Bb then it would be tall right ( B is tall little b is short.)

Science
Suppose the total momentum of two masses before a collision is 100 kg m/s. What is the total momentum of the two masses after they collide? A. 0 kg m/s B. 50 kg m/s C. 100 kg m/s D. 200 kg m/s

Life science
Who can tell me more about reproduction in plants( ovipary ,ovivipary ,vivipary)

science
differece between lizard and snakes

Science
Henri bacquerels original hypothesis was that florescent minerals became excited by solar energy and gave off X-rays. However, after he discovered uranium minerals emitted their own radiation without the help of solar energy, he abandoned his hypothesis. Why did, Bacquerel ...

Science
When Marie Curie isolated uranium from pitchblende, she realized that the pitchblende was more radioactive than the uranium she had extracted. What did she conclude about her observations? A. Pitchblende itself is a radioactive element. B. The pitchblende sample contained an ...

Science
What was henri Becquerel studying when he accidetally discoverd radioactivity? A. Photography B. Properties of black light. C. Porperties of X-rays. D. Solar energy. I believe the answer is C. Thank you

using skills
Which is inappropriate as a section of the parent newsletter? A. Suggestions for supportive home activities B. The problems of individual children C. Special field trips and other special activities D. Math and science units that are currently being experienced my answer is b.

using skills
Assignment 33 discusses 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...

Science
Which of the following is the smallest conceivable amount of time that could pass between a lunar eclipse and a solar eclipse? a. about 14 days* b. about 28 days c. about 183 days d. about 365 days

using 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 first ...

science
Which of the following illustrates mechanical weathering? A. Carbonic acid weathers marble limestone B.As plants grow, they produce weak acids that slowly dissolve rock C.Oxidation causes weathering in rock D.Repeated freezing and thawing in rocks causes weathering Is the ...

using skills
Which earth science lesson is especially appropriate for the primary grades? A. Moon B. Volcanoes C. Stars D. Weather my answer is d.

Science
A generator transforms A. Potential energy into kinetic energy B. mechanical energy into electrical energy***** C. Magnetic energy into electrical energy D. Friction into electrical energy Electrical charges that are different A. Attracts each other**** B. repel each other C. ...

Science
does water evaporating take away or add heat to the wet bulb?

Physical science
i push a 500n box up an inclined plane that is 4 m long and 1.2 m high. what force is applied to push the box up the ramp?

science
Measuring the speed of light through gelatin using a laser

Science 8th Grade
Items of clothing rub against each other when they are in a clothes dryer. This can sometimes cause a person to feel a slight shock when he or she removes the clothes from the dryer. This is due to A. The dryer not being grounded B. Static Electricity **** C. Current caused by...

Science
The density of ocean water depends on the depth because pressure compresses the water. If the density of ocean water at a depth of 10,000 m is 1.071 g/mL and if 25.0 g of water at that depth contains 190 mg of potassium chloride, what is the molar concentration of potassium ...

Science
an aquatic plant known as elodea is shown in the image below. If you observe Elodea leaves over a period of several minutes, you see bubbles forming on the leaf surface that eventually break away and rise to the surface of the water. These bubbles form as a result of ...

Science
What will the sound of speed be in air if temp is 10 degrees Celsius.this is crickets looking for e plantation on equation

science
a ball falls on a horizontal from a height h,if the coefficient of restitution be e,find the distance before it will stop

7th grade science
how much work is done on an object with 25 kg on earth if it moves 13m? i really need help

Science
What is another example of a gas in your classroom? I know air would be one but I can't think of what would be another one present in a classroom. Thanks...

Science 8th Grade
1. How Will resistance change when the voltage increases in an electrical circuit if the current remains constant A. It will decrease **** B. It will stay the same C. It will increase D. It will decrease, then increase

Earth Science
What color will a star be with a surface temperature of 5000–6000 K? A. blue B. yellow C. white my choice is B yellow

Science
Human Body & Disease Practice 1) Which of the following effects would you expect if red blood cells were shaped like neurons? :They would not be able to move as easily through capillaries.*** :They would more easily carry out gas exchange in the alveoli. :They would not need ...

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