Science

Recent Questions

Science
Studies conducted in England during the Industrial Revolution have shown that children born to poor families were, on average, shorter than those born to wealthier parents. The most likely explanation for this difference in height is a difference in

science
Calculate the root mean square speed and most probable speed for co2 at25°c

Science
Which word or phrase below best describes the function of the urinary bladder? Filter Storage tank Blender Passageway*** Help me please i am trying to check my test and make sure all the answers are right

science
Two copper globes are floating in space with a charge of -10 and charge of +16. They come together then go back apart. What are the resulting charges

Science I guess
So I have been reading the twilight series and I would like to know are you team Jacob or team Edward please bee nice (:

Physical science
Calculate the mass of carbon monoxide that was needed to produce 78 grams of methanol by the following reaction: 2H2+CO=CH3OH

Physical science
Determine the number of moles of sodium hydroxide produced when 2 moles of sodium and 3 moles of water react to form sodium hydroxide and hydrogen gas.

science
A marble at rest is dropped from the top of a building. Find the marble’s velocity after it has fallen for 3 s. Ignore air resistance. Use the formula: v = g x t, where v = average velocity, g = acceleration due to gravity and t = time

Science
The development of the amniotic egg made early reptiles less dependent on water? True False

Environmental Science
How is genetic engineering similar to traditional plant breeding? A) Both processes are used to produce desirable traits in crop plants. B) Both processes involve only allowing certain individuals to breed in a population to enhance passing of certain traits to future ...

Environmental Science
Which term is used to describe when genes are transferred from one species of crop plant to another to produce desirable traits such as pest resistance? A) Selective breeding B) Genetic engineering I think the answer is A

science
Sodium nitrite is prepared by a reaction of sodium nitrate and carbon: NaNO3 + C → NaNO2 + CO2 Calculate the masses of reactants needed for the preparation of 10 g of NaNO2. Carbon is used in 10% excess. The atomic/molecular masses are: NaNO2= 69.0 g/mol , NaNO3=85.0 g/mol ...

SCIENCE
WHAT IS MEAN OF CHEMISTRY?

Science
If a 1 tonne car travels at 16.7 m/s (60km/h) then it would have a momentum of

Science
What are some ways (at least two) that cells can increase their (Unicellular and multi-cellular organisms) surface area to volume ratio without splitting into multiple cells?  One way that cells can increase their surface area to volume ratio without splitting into multiple ...

Science
Which of the following would have more thermal energy? 200 mL of water at 100 degreesC or 100 mL of water at 100degreesC

Science please help
What are some ways (at least two) that cells can increase their (Unicellular and multi-cellular organisms) surface area to volume ratio without splitting into multiple cells? One way that cells can increase their surface area to volume ratio without splitting into multiple ...

science
What are some ways (at least two) that cells can increase their (Unicellular and multi-cellular organisms) surface area to volume ratio without splitting into multiple cells? I am having trouble finding information on the ways.

Physical science
Explain why an endothermic reaction might cause a drop in temperature.

Science
Which of the following would best explain why a species of wildflower native to Switzerland is observed growing in the wild in Montana?

Science Ecology
List at least three ways in which Grassland and Tundra biomes are similar.

science
A person claps his hands near a cliff and hears the eco after 2 seconds if the speed of the sound in air is 340m/s find the distance of the cliff from the percent

Science
Two students discover that 500g of water occupies a volume of 50mL. Is this result correct? Explain your answer.

Science
why dont monocot and dicot have the same arrangements of vascular tissues

Science
For this activity, we had to make cube shaped models to represent cells. Then we had to compare surface area, volume, and surface area to volume ratio (SA:V) between the cells.  Cell A:  length of one side=1cm  Surface area= 6cm^2  Volume= 1cm^3  SA:V= 6  Cell B:  ...

Science
Two students discover that 500g of water occupies a volume of 50mL. Is this result correct? Explain your answer.

Science
Some constellations such as Ursa Minor, are visible in the sky year round other constellations appear for only part of the year.Explain why this happens. The earth moves in its orbit, so the direction facing away from the sun changes during the year. We only see stars in the ...

science
For this activity, we had to make cube shaped models to represent cells. Then we had to compare aurafve area, volume, and surface area to volume ratio (SA:V) between the cells. Cell A: length of one side=1cm Surface area= 6cm^2 Volume= 1cm^3 SA:V= 6 Cell B: Length of one side...

science
What property must a substance have if you want to use the substance to make aqueous solution

science
if two balls made of iron and aluminum of equal volumes are immersed in a liquid, then will they experience equal upthrust?

Science
Time taken by CO2 gas to diffuse 5000km distance is 2sec.Find the time taken by Cl2 gas to diffuse the same distance.

SCIENCE
If 5 equal pieces of 25 ohm (omega) is joined in parallel then what is the equivalent resistance of IS ?

Science - hyperthyroidism
Hello, Can someone explain to me how does negative feedback loop work with a person whose condition is hyperthyroidism? How does graves disease effect the homoeostasis of the thyroid function and its production of hormones I am reading the book but it does not make sense at all.

science, maths
Why are electric field lines perpendicular at a point on an equipotential surface of a conductor .

maths , science
Two point charges q and -2q are kept 'd' distance apart . Find the location of point relative to charge 'q' at which potential due to this system of charges is zero.

Science
What type of boundary is an earthquake? I think it is either Transform or Divergent.

Science
A reaction has a standard free-energy change of –11.70 kJ mol–1 (–2.796 kcal mol–1). Calculate the equilibrium constant for the reaction at 25 °C. Im so lost please help

Science
What are the uses of reactivity series??

Science
A wreaking ball has a mass of 315 kg. It it is moving at a speed of 5.12 m/s what is its kinetic energy?

Science @ MS SUE !
what are some advantages of using renewable energy sources instead of fossil fuels ???????????

Science 6
When striking a match what type of energy is represented? A thermal B chemical potential C mechanical D electromagnetic I think the answer is b Thank you

Science
Mount St. Helens, the Great Lakes, and Death Valley are physical features of the earth. What is the scientific term used to describe these features? A. cartography B. topography C. geology D. contourology

SCIENCE
When you turn on a television, you transform electrical energy into what types of energy? 1) heat energy 2) light energy 3) elastic potential energy 4) sound energy I THINK #1 ,#2 #4 Thanks for your help.

science
A gas sample has a volume of 150ml when the pressure is 175kPa. If the temperature and amount of gas remains constant, what volume will the gas sample occupy at a pressure of 120 kPa

Science
If 2.4g of magnesium burns in oxygen to produce 4.0g of magnesium oxide, Write a balanced equation for the reaction

Mathematics for social science
1.There are 20 people in a club. In how many ways can the club elect a president, a secretary and a treasurer, on person can hold more than one office? 2. How many ways can a committee of 4 people be selected from a group of 10 people?

science
Explain why Earth and other planets were not solid when they formed during the beginning of the Precambrian, approximately 4,600 million years ago (MYA). What was this particular time period called, and why is this time period not really considered a part of Earth’s ...

science
Which statement about fungi is true? a. Fungi are producers b. Fungi cannot eat or engulf food c. Fungi are found only in soil d. Fungi are primarily single celled pls no bad comments

Science
Let me know if these are biotic abiotic or both Mushrooms,Desert, temperature, mold ,hair,ocean ,trees,rocks, gold plastic, oxygen, tundra

science
. A runner jumps over a hurdle. Neglecting friction, the potential energy of the runner at the highest point compared to his kinetic energy at the lowest point is

SCIENCE
Why is it hot to touch to an incandescent bulb?? Please reply fast. Thank you in anticipation.

science
If eye color is determined by 4 possible genetic combinations,RR-Brown/RL-Brown/LR-Brown/​LL-Blue,what percent of the possible genetic combinations are carriers for the Blue-eyed offspring?

Science
Mass of iron cube having edge length 1.8m is 70g.Find it's density.

science
2 lenses in contact of power 3D and -5D form a composite lens. An object is placed around a distance 50 cm from this composite lens,find the position of the image.

science
5N*2m=

Science
The linear magnification produced by a spherical mirror is -1.Analysing this value state the type of the mirror and position of the object with respect to the pole of the mirror. Draw the ray diagram to justify your answer.

science, Health
RATE of diffusion must be expressed as number of particles moved per unit time. Write this as a word. Can you please teach me this?

science
While conducting the experiment to measure the weight of water displaced by the body precaution should be taken to immerse the solid in water without touching the walls or bottom of the container. Why?

science
If two balls made of iron and aluminium of equal volumes are immersed in a liquid then will they experience equal up thrust? Justify your answer.

science
A ball is projected vertucally upward from ground with avelocity of 20m/s .How high willit go.a 5m b10m c15m d20m e25m correct options of this question.

science
A ball is projected vertucally upward from ground with avelocity of 20m/s .How high willit go.a 5m b10m c15m d20m e25m correct options of this question.

Science
Two point charges q1=4uc& q2=9uc are placed 20cm apart.the electric field due to them will be zero on the line joining them at a distance of

Science
Compare lunar and solar eclipses and answer the following questions: How does a lunar eclipse happen? How does a solar eclipse happen? Which one occurs more often?

science
The wood thrush is a bird species that lives in deciduous forests in North America. Wood thrushes nest in tall trees, forage for insects and snails in decaying leaf litter on the forest floor, and drink water from nearby freshwater sources. Identify one biotic factor and one ...

science
Two charges repel each other with a force of 10-5newton when they are 20cm apart. what is the force on each of them are i 3cm apart and ii when they are 100cm

science
An object 4.0cm in height is placed at a 25cm from a concave mirror of focal length 15cm.find the position, nature, and size of image formed.

Science
If 5 equal pieces of 25 ohm (omega) is joined in parallel then what is the equivalent resistance of it. Is it 5 or 1.please urgent

physical science
an object has 2.0x 10^19 more electrons than protons. What is the net electric charge of this object in coulomb?

physical science
a cars radio draws 0.25 A of current in the autos 12 volt electrical system. How much power in watts does the radio use?

Science
Water is a(n) what factor in all ecosystems that all living things require.

Science
How are earth and Venus similar? How is Venus different from Earth? Provide two similarities and two differences.

Science
Roseate spoonbills are wading birds that live in the Everglades of Florida. These birds eat a diet of shrimp fish amphibians and aquatic plants. Which of the following sets of words can be classified for these species? A. Autotroph omnivore predator B. Heterotroph herbivore ...

science
A kid kicks a soccer ball of mass 430g so that the ball moves on a flat rough ground at a velocity of 16m/s towards a stairway. The ball experiences a constant frictional force of 5N over a distance of 200cm. it then hits the stairway and collides elastically with the edge of ...

SCIENCE
a geneticist is studying a pedigree that shows the family history of a recessive genetic disease. which of the following pedigrees shows an impossible relationship.

library science
Factors Affecting the Development of Information resources and services

Science
What would be the effect on the seasons and the northern and southern hemispheres if Earth were not tilted?

science
what is the molar ratio between barium hydroxide and potassium hydrogen phthalate if they were reacted together in an acid base titration

science
An automobile travelling at 80km per hours has tyres of radius 80 cm. On applying brakes the car is brought to a stop in 30 complete turns of the tyres. What is the magnitude of the angular acceleration of the wheels how far does the car move while the brakes are applied

science
A truck of mass 2000 kg moving on a highway experience an average frictional force 800 N. il its speed increase from 25m / s to 35m/s over a distance of 500m. What is the force generated by truck

science
A bullet of mass 20g travelling at speed of 350m per second strike a steel plate at an angle of 30degree with the plane of plate it ricochets off at the same angle at a speed of 320m per second what is the magnitude of impulse that the steel plates gives to the projectile if ...

science
A bullet of mass 20g travelling at speed of 350m per second strike a steel plate at an angle of 30degree with the plane of plate it ricochets off at the same angle at a speed of 320m per second what is the magnitude of impulse that the steel plates gives to the projectile if ...

Science
What abiotic and biotic factors might limit population size and mono lake?

Science
How are the primary pigments related to the primary colors? The primary pigments are: A. Complementary to the primary colors B. Associated with the primary colors C. Unrelated to the primary colors Is the answer A?

Physical Science
Find the hydroxide-ion concentration in an aqueous solution when the hydronium-ion concentration is 1×10^−10M. Recall that 10^a×10^b=10^(a+b). Express your answer to one significant figure and include the appropriate units.

Physical Science
Find a hydroxide-ion concentration in an aqueous solution having a pH of 2. Express your answer using one significant figures. I thought the answer was 1*10^-2, but I have no clue what I am doing wrong.

Science
A professional baseball player pitchers a ball giving it a velocity of 45m/s towards the butter. The batted ball has a velocity of 30m/s towards the pitcher. Let the direction from the batter to the pitcher be the positive direction. If the change in velocity takes place over ...

Science
In the record setting race, a dragster reached a velocity of 145.08 m/s in 4.48s. What was the dragsters average acceleration? Assume that the direction of the velocity is positive.

Science
The image above shows the movement of a wave over three seconds. What is the frequency of the wave? A. 2 hz B. 5 hz C. 1 hz D. 3 hz

SCIENCE
Barry used a ramp to transport a load to a truck. The ramp made work easier by : 1) reducing the size of the input force 2) reducing the input force to zero 3)changing the distance over, which the input force was exerted 4) reducing the output force to zero I think #3

Science
My sister plays her PS4 all day and whenever her remote vibrates while it's sitting on the couch, I can feel the vibration from a different seat. I don't understand how the vibration of a little remote can move throughout a whole, large couch.

SCIENCE
The handle of a tennis racket is enclosed in rubber. What is the function of the rubber handle? 1)to increase energy 2)to increase weight 3)to increase friction 4)to increase force I think # 3

science
how many grams of nacl are required to neutralize 100 ml of 1M h2so4???

Science
Draw a dot plot representative of a flow cytometry test that looks at two markers. One marker is diagnostic, while the other marker is prognostic. Identify and name your markers and their detecting antibodies. Complete the plot as you wish and correctly interpret it. 

Science:Just need quick help
I am very tired and can hardly think straight. Thanks in advance to those who help. The amount of each size particle in soil is the particle size distribution. Is putting soil and/or sand in a bottle of water a good way to determine particle size distribution? Why or why not?

Science (HELP ASAP)
1. Which of these is not an environmental effect of building dams A. Reduced fertility downstream<<< B. Weed growth downstream C. Increased water temperature D. Soil erosion upstream 2. Which of these is not an environmental effect of destroying wetlands A.smog B....

Science
Electromagnetic and mechanical waves have different characteristics that make them advantageous for certain applications. Select the reasons that mechanical waves, such as ultrasound, are used for soft tissue imaging and to identify fractures in metals. Question 1 options: ...

Science
When plants grow toward sunlight they____ A. Live longer B. Get more light C. Get smaller D. Die faster

Science
Which of the following boxes below represent a stable system? Describe how a disturbance to this box would affect it. Use the terms center of mass and equilibrium in your response. Box A: Shaped like a diamond on a flat surface with an arrow pointing downwards. Box B: A square...

physical science
If sam drops a 40 kg mass from a height of 20 meters on earth how much was the potential energy of the mass before he dropped it a-800 j b-784 n-m c-800 n-m d-7840 j e- 200 j

physical science
a 500 kg elevator is lifted 10. How much work was done a 50 j b 50 j /kg c 5000 j d 5000 j/kg degree c

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