Science

Recent Questions

science
A ball is thrown from a height of 10m with certain initial downward velocity. It hits the ground and loses 50% of its energy during the impact and rises back to the sane height. What was its initial downward velocity of projection?

science
calculate the work done in moving a mass of 50 kg from one point to another point if the gravitational potential diffrence between these two points is 2*10^3j/kg

Re-post Langauge arts
Plugged In, but Tuned Out: The Evil Influence of the MP3 Player Darrell Thomas I. Invasion of the Body Snatchers: Have you noticed a change in the world around you recently? Have you seen how more and more people are walking around with little white rectangles in their hands ...

Science
What is The Coriolis Effect?

Science
A cave explorer is surveying the cave. He follows a passage 100m straight east, then 50m in the direction 30degree west of north, then 150m at 45degree west of south. After fourth unmeasured displacement he finds himself back where he started. Whats the fourth displacement? In...

Science
Can someone help me/check with this work? 1. _______ is the rate of change of position. A.Speed***** B.Velocity C.Acceleration D.Deceleration 2. Which of the following is the difference between speed and velocity? A. direction***** B.units C.speed D.none of the above 3.A ...

Science
Calculate the mass of iron, which will be convert, into its oxide(Fe3O4) by the action of 18g of steam on it (A)21g (B)42g (C)64g (D)51g

Science
A battery of emf 10volt is connected to resistances as shownn in figure . The pitential difference between the points A and B is what ?

Science
What is an example of a stable system? How were you able to determine whether or not this system is stable?

science
why are you guys posting questions without the answers to them

Science
You are to choose four landforms for your research. As you complete the research on your chosen landforms, be sure to gather these details: the landform's locations the process/processes that formed the landform facts about the landform ways in which the landforms ...

MJ Science 3
Which of the following is not a property of a metal? Luster Malleability Permeability**** Ductility

MJ Science 3
Q 1 A geographical area where plants, animals, the landscape, and the climate all interact together is called a(n) environment ecosystem**** biome food web Question 2(Multiple Choice Worth 4 points) The process of sharing electrons between two atoms is called metallic bonding ...

MJ Science 3
Q 1 A geographical area where plants, animals, the landscape, and the climate all interact together is called a(n) environment**** ecosystem biome food web Question 2(Multiple Choice Worth 4 points) The process of sharing electrons between two atoms is called metallic bonding ...

Science
Which of the following is the suns visible surface layer? The core The radiation zone The convection The photosphere*** I tryed looking in my notes but I can't find it and this is on my test can you please tell me if im right?!?!

Physical Science
An isotope of radon gas, Rn-222, undergoes decay with a half-life of 3.8 days. How long does it take for the amount of Rn-222 to be decreased to one-sixteenth of the original amount?

Science
Compare and contrast one of the outputs with one of the side effects.

science
A transverse wave has an amplitude of 5 cm, a frequency of 60 Hz and a distance from crest to next trough of 15 cm. Identify the wavelength of this wave. Please someone help asap I cant figure this out. Is there a formula?

science
which substance has a melting point of -219 degree celsius and boiling point of -183 celsius at room temperature 30 degree celsius

Science
A biologist studying a desert ecosystem observes that the population of a lizard species increases following a particularly hot, dry period that causes a snake population to decline. What could the biologist hypothesize about the roles of these two species? A.The lizard preys ...

Science
Fertilizers And Pesticides Applied To Farm Fields In Pennsylvania Have Their Way Down Into The Chesapeake Bay In Maryland This Is An Example Of __________ Pollution. Answer: I was thinking it is either nonpoint source or point source

Science#2
How do ocean currents influence the climate of a place? A) They transport heat over large distances, affecting the wind that blows over the land. B) They bring cold water from the poles, reducing the temperatures along the coasts. *** C) They draw out moisture from the wind, ...

Science
Jupiter, Saturn, Uranus, and Neptune: what is one reason why life probably does not exist on these four planets? A) They have no gravity. B) They are the gas planets. C) They are the giant planets. **** D) They are the rocky planets. Earth seems to be the only planet in our ...

Science
why is using a ramp to load a heavy object into the back of a moving truck easier than lifting it in?

Science
An archer fires an arrow, by applying an average force of 182 N across a distance of 38.0 cm on the bow. If the arrow has a mass of 22.0 g, find its velocity when the archer releases the bow: a)if the conversion is 100% efficient. b)if the conversion is 77.0% efficient.

Physical Science 9th grade
Could someone please explain how I do this or provide a link explaining how. I am very confused. 1) a) Name 2 properties of waves that change if the wave changes media. b) Name a property that does NOT change when it changes media. 2) If the wavelength of a wave increases when...

science help only have 3 min left
Earth seems to be the only planet in our solar system that can support life. All BUT ONE of these is a reason why life is found only on Earth. That is A) a moderate climate. Reactivate B) the presence of water on Earth. C) it is the perfect distance from the sun. D) it has ...

Science
person is watching through a window of an apartment sees a ball that rises vertically upward and then vertically down for a total time of 0.5 seconds. if the height of the window is 2 metre, find the max height above the window reached by the ball

Moon Science
What causes the phases of the moon as observed from the Earth? A) Filtering of the light from the moon due to the Earth's atmosphere. B) The tidal forces of the Earth's oceans change the appearance of the moon. C) Change in distance of the moon from the Earth as it orbits in ...

Science
A meteorite is DIFFERENT from a comet mainly because has a tail of ice and dust enters the earth's atmosphere*** has a nucleus made of snow and rock is found in the orbit between Mars and Jupiter

Science
A hurricane becomes more powerful be evaporating water from? lakes mountains oceans*** rivers 1. Over time, scientists have changed their model of our solar system. It has transitioned from A) a sun-centered to an moon-centered model. B) a sun-centered to an earth-centered ...

Science
The sun's apparent motion across the sky from East to West daily is due to the A) rotation of the sun. B) rotation of the earth.*** C) orbit of the earth around the sun. D) orbit of the sun around the earth

science
Cobalt-60 has a 30 year half-life. How much of an 80 gram sample would remain after 60 years?

Science
Nathalie pushes on the pedals of his bike with a 320N force. If the bike has a produced force of 640N, what is the mechanical gain of the bike?

CHECK my answers Physical science
10. If a solid piece of iron is heated and remains at 80°C until it is completely melted, you know that 80°C is (2 pts) * a. the freezing point of iron b. the melting point of iron c. the boiling point of iron d. both the freezing and melting points of iron my answer would ...

Science
How much effort force would you have to use to lift a 800 newton load using a pulley system with a mechanical advantage of 4?

science
A 1600kg car starts at rest and reaches 40 m/s in 6 seconds. I need to find: a) the change in kinetic energy b) work c) distance d) applied force of the engine

Science
A ball is dropped from a height of 20 meter and rebounded with a velocity which is 3/4 of the velocity with which it hits the ground. What is time interval between the first and second bounces?

science
What is the molarity of 7.30g HCl

Science
The u.s. constitution provides that each of the three branches of the federal government has certain powers that can limit the powers of the other branches. These limitations are known as the system of checks and balances. Which of the following actions is a check by the ...

science
In the hydraulic lift in the illustration, the car on the one side of the lift can be lifted by applying an effort force to the opposite side of the lift. If the effort force applied (F1) was 900 N on the 1 m2 area (A1), what is the load force of the car (F2) if the area (A2) ...

Science Pls Help
How is an areas topography determined? A. by using an ares long. and lat. B.by using an areas scale c. by using an areas elevation relief, and land forms*** d. by using an areas elevation, long. and lat.

science (physics)
A body travels 10m in 5th second and 30m in 10th second. Find its initial velocity and acceleration.

Science
What quantity of Caco3 must be heated to give sufficient amount of Co2 to convert 10.6 gms of Na2Co3 completely into NaHCo3 ?

Science
And ice cube Wayne 1 g is placed in our closed insulated container with 9 g of water at 20°C 68°F after 24 hours elapse the container will hold what (1) ten grams of water (2) one gram of ice and nine grams of water (3) five grams of ice and five grams of water (4) nine ...

Science
Which of the following substances would be most effective in relieving pain caused by a man- of- war (1) tap water (2) club soda (3) lipstick (4) perfume (5) lemon juice

Science
If all of the nematocysts on a mature man-of-war were filled with poison, what is the total amount of poison ( in milligrams) they would contain? It takes 24,000 nematocysts to release a single milligram of poison. (1) less than one milligram (2) two milligrams (3) five ...

Science
which of the following is true about kinetic energy select all that apply A as an objects speed increases kinetic energy decreases B only moving objects have kinetic energy ••• C kinetic energy increases as an objects height increases D kinetic energy depends on an ...

science
How would you separate a mixture of small beads, sand, iron filings, salt, and water, using a magnet, filter funnel, filter paper, bunsen burner and a tripod with a bunsen burner? I thought of Filtration, Evaporation, Distillation, Magnetism, and even Sieving but only 4 of ...

Science
A family is planning to build a raised planting area using a blend of peat moss, mulch , and a rich organic soil in which to grow the plants. They have been told first to place on the ground a layer of material that will allow for a proper drainage each time the plants are ...

Science
Does nano3 turns phenolpthalein indicator pink?

Science
It is winter where Jenna lives. It’s been snowing all day, but now the snow has changed to sleet and then to freezing rain. What is happening at Jenna's house then- temperature-wise?

Science
Which of the following solutions would have the highest boiling point? (1) 5 liters of water (2) 5 grams of salt dissolved in 4 liters of water (3) 10 grams of salt dissolved in 3 liters of water (4) 15 grams of salt dissolved in 2 liters water (5) 20 grams of salt dissolved ...

Biology
what are goals of science? Choose all that apply. A) to investigate the natural world B) to establish unchanging facts C) to explain natural phenomena D) to make useful predictions based on evidence

science
Ricardo finds an online site about the gas laws. The site shows the equation below for Charles’s law. What change would correct the error on the site?

Science
Why the ball of ventrical is thicker than the ball of atrium

Science
Clasify this reaction Zn(s) + 2HCl(aq)-ZnCl2(aq)+H2(g)

Science
Water condenses on the grass in the early morning help

science
describe briefly how you would prepare a 0.2M solution of KOH in 250cm flask

Science
A kitchen ceiling light has five lightbulbs on it. When one of the lights goes out, the other four will stay lit. This is an example of a series circuit. True or False I think FALSE because a series circuit would make them all go out.

Science
How are fossil fuels formed? A:They are formed from the metamorphosis of rocks deep underneath the ground. B:They are formed from the remains of organisms that were buried and altered over millions of years. C:They are formed from hydrocarbons that react with oxygen.**** D:...

Science
1g mixture of Cu2O and CuO on heating gives 0.88g of copper. Calculate % of CuO in mixture

science
why are cherry blossoms called cherry blossoms

science
A mixture of benzenoic acid aniline and phenol is dissolved in chroloform and the solution was treated with sodium hydroxide.hydrochloric acid and sodium bicarbonate.show the separation chart,identify the composition of each phase and explain the chemistry of the separatiob ...

Science
A car travel along a straight line for first half time with speed 40km/hrs & second half time with speed 60km/hrs. Find average speed.

science
a person moves 30 m north , then 20 m east and finally 30 root 2 south west what is his displacement from the original position

science
a boy is going from one place to another he goes 100m north and then 70 m east find the displacement of the boy from his starting point

Science
Explain why would the debris fan (mound of deposition) be greener than the surrounding areas? Think of the slide mass versus the surrounding in‐place bedrock in terms of porosity and permeability; how would these parameters differ?).

science
Can someone please explain how does the troposphere differ from the stratosphere

science
A lab technician adds 0.035 mol of KCl to 1.00 L of 0.0050 M Pb(NO3)2. Ksp = 1.7 × 10–5 for PbCl2. Which of the following statements is correct? a) Lead chloride precipitates until the solution is saturated. b) The solution is unsaturated and no precipitate forms. c) The ...

physical science
it takes 100n to pull an object up an inclined plane. the gravitational force on object is 600n whats load force whats effort force

Science
What occurs when atoms link together in a new ways to create a substance different from original substances

Science
How does a tornado work?

Science
Electric charges that are different? 1)attract each other 2)repel each other 3)exist in pairs 4)do not interact I think #1 Thanks

science
Which statement most accurately compares Earth’s crust and Earth’s mantle?

Environmental Science
When do government agencies have to file and Environmental Impact Statement (EIS)? A) Any time a federal agency proposes a project that will use taxpayer money*** B) Any time a federal agency proposes a project that will cost more than $1 billion C) Any time a federal agency ...

Science
Acceleration due to gravity on planet mercury 3.7m/s.what would the mass of a person weighing 637 n on mercury

Science
Which of the following is true about the electric charges on the objects below The ball on the right has a positive charge and the ball on the left has a negative charge The ball on the left has a positive charge and the ball on the right has a negative charge The balls do not...

science
The ozone layer is located

Science
A cyclist speed up at a constant rate from rest to 8m/s to 6s. Find the acceleration of the cyclist

health, science
How can I explain Lung cancer to children? I don't know how to explain in easy words. "Lung cancer is the uncontrolled growth of abnormal cells in the tissues of the lungs. If not treated, lung cancer may spread to the surrounding tissues and other parts of the body."

CHECK my answers Physical science
1. which of the following should be classified as a suspension? A. soda** B. sand in water C. glass D. milk 2. Which of the following is an of example of a chemical property? A. density B. flammability C. hardness** D. melting point 3. Which state of matter has a definite ...

Science
In what fields would a lab technician need to separate & identify organic items? I looked it up and it said organic chemistry, forensics.. . I'm not which one because couldn't it range?

science
Juggle and bangles are clowns.juggles stands on one end of a teeter-Ritter at rest on the ground.bangles jumps off a platform 2.5m above the ground and lands on the other end of the teeter-totter,launching juggles into the air.juggles rises to a height of 3.3m above the ground...

Science
Four equal point charge each of 16microcoulomb are placed on the four corners of a square of side 0.2m.calculate the force on any one of the charge

physical science
can mechanical waves travel through any type of medium?

Math and science young children
What is the shorthand method for adding quantities with the same amount called?

science
mohan travels at 20m/s from home to market and returns at 25m/s find his average velocity for the entire journey

science
What is the pH of a 0.05 M solution of potassium hydroxide??

science
The iodine-131 nuclide has a half-life of 8.0 days. If you originally have a 257 g sample, after 48 days how much will you have?

science
2. Compare and contrast deductive reasoning and inductive reasoning. Based on the information given here, answer the following questions about the experiment: • What are the qualities of deductive reasoning? • What are the qualities of inductive reasoning? • Throughout ...

Engineering science
A boat start sailing on Monday 10:00 at harbour A and sails 600km due north. Later it turns east for a further 420km to reach harbour B on Tuesday at 12:00.a)find total displacement from A-B average. b)speed of the trip.c)average velocity

Science
Hey! so, I was just wondering if someone could check a few of my answers. 1. during what phase of the moon can a lunar eclipse occur? A. New moon B. First Quarter C. Waxing gibbous D. Full moon* 2. Which of the following is the smallest possible amount of time that can pass ...

science
how do layers b and d compare in age? if rock layers between b and d have eroded away,what is the boundary between b and d called

Physical Science
What will be the total resistance and current in a parallel circuit with a 15-volt battery and 3 10-ohm resistors?

Science
What is global warming? What can people do to reduce global warming?

science
2. Compare and contrast deductive reasoning and inductive reasoning. Based on the information given here, answer the following questions about the experiment: • What are the qualities of deductive reasoning? • What are the qualities of inductive reasoning? • Throughout ...

Science
How do calculate specific heat and thermal energy?Science is hard in the 8th grade .

Language arts
1. One would expect people living in a utopian society to be A. wealthy B. difficult C. idealistic D. impossible 2. Which statement best describes a utopian community? A. People band together to share resources and duties equally. B. Resources are distributes in accordance ...

science
Where will the African Plate be in 100 million years?

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