Monday
February 20, 2017

Homework Help: Science

Branches of Science

Recent Science Questions

Science
When sodiun is placed in water,it reacts violent to produce hydrogen gas and form sodium hydroxide solution. write a balanced chemical equation for this reaction
Friday, February 10, 2017 by Boren

Science
Why the bulb glows when the electric current passes through it?
Thursday, February 9, 2017 by Brajesh

science
does condensation or evaporation occur on a cold can of juice is put on the table on a hot day
Thursday, February 9, 2017 by sam

Science
Which of the following forces causes a feather to fall slower then a bowling ball? A.gravity B.rolling friction C.sliding friction D.air resistance
Thursday, February 9, 2017 by Winter

Science ms sue please help
Must new substances be formed when you observe a chemical property? My answer is no because you are just observing. There is no reaction taking place. I don't know if my answer is correct.
Thursday, February 9, 2017 by Jenny

Science
Must new substances be formed when you observe a chemical property?Explain.
Thursday, February 9, 2017 by Leny

Science
What effect does observing a substance's physical properties have on the substance?
Thursday, February 9, 2017 by Stepfanie

Science
Why do automobiles rust more easily in wet climates than dry climates?
Thursday, February 9, 2017 by Stepfanie

Science
If you let all of the liquid evaporate out of the pitcher, would you be able to see the solid particles of the drink mix? Explain.
Thursday, February 9, 2017 by Stepfanie

Science
If one sound registers one decibel more than another, then it is ____ times as intense? Round your answer to three decimal places.
Thursday, February 9, 2017 by Amanda

science
The Sun is unusual because it does not belong to a ____ ? A) solar system B) universe C) galaxy D) binary star system I think the answer is D but I'm not 100% positive.
Thursday, February 9, 2017 by Anonymous

Social Studies nhf
Thank you! BTW, nhf stands for need help fast :) thank you again in advance!! All right! So, I have a few essay questions I want to make sure are right! This is really important to me and I am not that good in science. Please help me!! Here goes everything! (6 points) 1. ...
Thursday, February 9, 2017 by Anonymous

Science
The African plate is moving toward the Eurasian plate at a rate of a few centimeters per year. How will this area change in 100 million years? In your answer, consider how continents will change and how the Mediterranean Sea will change. I was trying to click on your link but ...
Thursday, February 9, 2017 by Saydee

Science
The African plate is moving toward the Eurasian plate at a rate of a few centimeters per year. How will this area change in 100 million years? In your answer, consider how continents will change and how the Mediterranean Sea will change.
Thursday, February 9, 2017 by Saydee

Science
A geologists working in a national park finds a mineral he is carrying a kit that contains a penny, a hand lens, a piece of tile, a geologic hammer, and a jackknife. Describe how the geologists can use these items to determine some of the minerals characteristics.
Thursday, February 9, 2017 by Jennifer

Science
Which of earth's spheres contains mountains,valley's, and other landscapes?
Thursday, February 9, 2017 by Mike

science
Tom is marking the locations of active volcanoes on a world map. Explain how the locations of the volcanoes are related to Earths plates. can you please explain this to me, I don't understand....thx
Thursday, February 9, 2017 by Isabella

SCIENCE asap :P
Twice a year on Earth, the number of hours of darkness is equal to the number of hours of sunlight. These events, where both day and night are 12 hours, are the spring and autumn equinoxes.Which of these describes the orientation of the sun and Earth on these two days? A.Earth...
Thursday, February 9, 2017 by coolguy123

science
How do you make a 10 ml buffer with 8M urea (mol. weight 60.06g/mol)
Thursday, February 9, 2017 by Ola

Science
Discuss ways in which the environmental health hazard can impact negatively on human health
Thursday, February 9, 2017 by Tee

science
Find flux density if area is 1mWb and area 1inch^2
Thursday, February 9, 2017 by nidhi

Science
Describe how fans in a sporting stadium would need to move to create a transverse wave and a longitudinal wave
Wednesday, February 8, 2017 by Zayn

science
A galvanometer of resistance 100  gives full scale deflection at 10 mA current. What should be the value of shunt so that it can measure a current of 100 mA?
Wednesday, February 8, 2017 by harsh

Science
1) If you let all of the liquid evaporate out of the pitcher, would you be able to see the solid particles of the drink mix? Explain. 2)Compare what happens when a geyser erupts to what happens when a tea kettle whistles. 3)Name something made of aluminum and explain why ...
Wednesday, February 8, 2017 by Stepfanie

science
Explain the differences between internal and external fertilization and the advantages and disadvantages of each reproductive strategy.
Wednesday, February 8, 2017 by JDog

Earth Science
1. We start with 400 atoms of Uranium-238. How many remain after 4.5 billion years? _______ After 9 billion years? _______ After 13.5 billion years? ________ 2 . How long will it take for ½ of the original amount of Rubidium-87 to decay? _______ 3. Carbon-14 has a half-life ...
Wednesday, February 8, 2017 by 아, 깹송~

Science---Hurry Please Help!
What do the lines making a circle around the high-pressure area indicate? A) Areas of equal pressure B) Areas of equal altitude C) An occluded front D) A stationary front
Wednesday, February 8, 2017 by Don't need to know. Sorry

science
how should each form of energy be identified? A) energy A:gravitational energy /energy B:chemical energy B) energy A: nuclear energy/ energy B: electrical energy C) energy A: electromagnetic energy energy B:sound energy D) energy A: mechanical energy /energy B: thermal energy
Wednesday, February 8, 2017 by kakashi hatake please help

science
what similarities do nuclear energy and chemical energy share? select all that apply. A) both are types of kinetic energy B) both are types of potential energy C) both involve magnetic energy D) both involve stored energy please help! anybody just anybody!
Wednesday, February 8, 2017 by kakashi hatake please help

science
1. what occurs as the convection current moves toward the upper mantle density increases density decreases temperature increases temperature decreases 2. what occurs as the convection current moves toward the lower mantle (same options as #1)
Wednesday, February 8, 2017 by PLS HELP

Science
Ammonia is used as a refrigerant not ph3 why...?
Tuesday, February 7, 2017 by Amul

Effective Learning Environment
Which would be an important consideration for developing a preschool classroom? A. Unlike kindergarten children, children at this age don't participate in long-term projects, so they don't need storage for longterm work. B. You won't need a science or math center since ...
Tuesday, February 7, 2017 by Anonymous

Science physics
A uniform metres rod of weight 100N carries a weight of 40N and 60N suspended from the 20Cm and 90cm marks respectively, where will your pivot a knife edge to balance the rod.
Tuesday, February 7, 2017 by Obert

science
Two bricklayers are going for a swim. One bricklayer’s is the father of the other bricklayer’s son. How are the two bricklayers related?
Tuesday, February 7, 2017 by Anonymous

Science
if you want to completey vaporize 6.0g H2O liquid initally at 48.0 degree celcuis how many kj would be needed
Tuesday, February 7, 2017 by Dominique Delghingaro

Maths, agricultural science, life science and e on
What job can i do while am doing this sujects?
Tuesday, February 7, 2017 by Dzangalelo mukapu innocent

science
1. The Hertzsprung-Russell diagram below shows how the brightness, surface temperature, and color of stars are related.Which of these observations of Barnard’s Star is most likely accurate? * 1 point
Tuesday, February 7, 2017 by bnn

science
in xperiments involving a pithball electroscope what causes the pithball to move?
Tuesday, February 7, 2017 by cindy

science
Place the following words into the illustration below:gametes,sporophyte,gametophyte, and zygote,. Explain how the terms are related. I need help please!!
Tuesday, February 7, 2017 by softball lover

Science
a pendulum bob has by passing through its lowest position. what is its speed when make angle of 60 with the vertical the length of the pendulum is 0.5 .
Tuesday, February 7, 2017 by Ankit

Science
A pump is used to lift 500 kg of water from a depth of 80 m in 10 seconds.Calculate the power rating of the pump if it's efficiency is 40% . Take g=10 m/ s*s.
Tuesday, February 7, 2017 by Swati

Science
Material point is accomplishing harmonic oscillation. What is the time for its displacement from equilibrium position to half of its amplitude ? The period of oscillation is 24 s, and the initial phase is 0 rad.
Tuesday, February 7, 2017 by Ivan

science
What is the period of mathematical pendulum with a lenght of 39,2 m ?
Tuesday, February 7, 2017 by Ivan

Science
In what acceleration will tear a rope if it raises vertically body mass of 500 kg? The rope bears maximal strength force 15 kN.
Tuesday, February 7, 2017 by David

Science
Determine the weight of an astronaut with a weight of 100 kg, if the rocket which rises him moves with acceleration 9,8 m/s^2
Tuesday, February 7, 2017 by David

Science
Oscillating body has a period of 5 s. for one turn. Determine the frequency and angular frequency of oscillation.
Tuesday, February 7, 2017 by Moonblood

Science
Body of mass 10 kg is at rest on a horizontal surface. A force of magnitude 10 N is applied to the body for 10 s. What is the final speed of the body?
Tuesday, February 7, 2017 by Moonblood

science
A 2.4-kg pile of aluminum(ρ = 2.70 g/cm3)cans is melted, then cooled into a solid cube. What is the volume of the cube?
Monday, February 6, 2017 by tony

Science
Identify six stages of the process of scientific inquiry (scientific method) and explain why the process is not a rigid sequence of steps.
Monday, February 6, 2017 by Kay

physical science
Luster Malleable Ductile Conductor Solid at room temperature Which element could be described by the list of properties above?
Monday, February 6, 2017 by kalen

science
find the 8 kg of water at 80°c.
Monday, February 6, 2017 by numerical

science
1.A dog is trained to sit and shake hands. These traits are most likely (1 point) a) inherited b) not inherited*** c) not acquired d) innate 2.In a particular breed of cattle, a black coat is dominant over a red coat. If a cow with a red coat is crossed with a black bull that ...
Monday, February 6, 2017 by Anonymous

Science
What is amount of ammonia produced from 56 gm of nitrogen gas
Monday, February 6, 2017 by Manmeet

science
Proper condition for maximum yei of so3 in reaction 2so2+o2=so3+HEAT
Monday, February 6, 2017 by muna

Science
The mutual gravitational attraction between two masses in space is 686 Newtons. What is the new gravitational force between these masses if the distance between them is increased by a factor of 5.6? To be graded correctly, enter the new weight in Newtons (numbers only, no text...
Monday, February 6, 2017 by Erika

Science
An element X has 6protons and 8neutrons in it .what is the charge of the element
Monday, February 6, 2017 by Suryajith

Science
Physics A scientific instrument weighing 98 pounds on the Earth is transported to another planet whose mass is 1.7 Earth masses and whose radius is 0.7 Earth radii. What does this instrument weigh on this planet? To be graded correctly, enter the new weight in pounds (numbers ...
Monday, February 6, 2017 by Erika

science
A certain conductor has a risestnace of 5 ohms at 0oC. if the temperature coeffiecient is 0.002/0oC, find its resistance at 2000oF?
Monday, February 6, 2017 by Mharco D. Dela Vega

Physical Science
A 50.0-kg box is resting on a horizontal floor. A force of 250 N directed at an angle of 26.0° below the horizontal is applied to the box. What is the minimum coefficient of static friction between the box and the surface required for the box to remain stationary? 1) 0.441 2...
Monday, February 6, 2017 by Varusha

SCIENCE
3) You add 36 g of MgSO4 to pure water to a final volume of 200 mL. What concentration of solution did you make ? Express the results as percentage, % (w/v).
Sunday, February 5, 2017 by LIN

9th grade physical science
the density of copper is 8.92g/cm^3. If you plotted the mass of copper in grams versus the volume in cubic centimeters, what would the slope of the line be?
Sunday, February 5, 2017 by anna

Science
Pls help me solve this question pls. A stone of mass 6.5kg is thrown vertically upward with velocity with 10m/s find a. the potential energy at the greatest height and the value of h .b the kinetic energy of reaching the ground again(g=10m/s2) in physics?
Sunday, February 5, 2017 by Joseph

science
if a strong odour is smelt continuously for some time the sensation ofsmell of that substance weakness why?
Sunday, February 5, 2017 by adma

science
A hot air balloon is ascending with a constant velocity of 5m^s-1 when somebody in the balloon throws a bottle upward with a velocity of 2m^s-1 if the balloon is 55m above tge ground when this happens calculate the time taken for the bottle to reach the ground
Sunday, February 5, 2017 by lulama

Science
At what position a candle of length 3 cm be placed in front of a convex lens so that it's image of length 6 cm be obtained on a screen placed at distance 30 cm behind the lens
Sunday, February 5, 2017 by Paresh

Science
a bullet of mass 0.01kg is fired from a gun weighting 5 kg. If the initial speed of the bullet is-250 m/sec, calculate the speed with which the gun recoils
Saturday, February 4, 2017 by Priyansh

natural science
What volume of copper ( density 8.96 g/cm3 ) would be needed to balance a 1.15 cm3 sample of lead ( density 11.4 g/cm3 ) on a two-pan laboratory balance?
Saturday, February 4, 2017 by nachelle

Science
How many btu require to change 10 pounds of ice at 20F to steam at 220F
Saturday, February 4, 2017 by Darreus

Science
a bullet of mass 0.01kg is fired from a gun weighing 5.0kg . If the initial speed of bullet is 250 m/sec, calculate the speed with which the gun recoils
Saturday, February 4, 2017 by Priyansh

Science
Suppose that three samples of water are prepared as described: addition of carbon dioxide, addition of oxygen, and degassed to remove all gases. Three identical Elodea plants are placed in each of these water samples. How will the rate of bubble formation compare in the three ...
Friday, February 3, 2017 by Candi Girl

Science
Carrying capacity is the maximum number of ___________ that an ecosystem can support 1.different species 2.individuals in a population**** 3.habitats 4.limiting factors In an island ecosystem, a species of beetle feeds on leaves of a shrubby plant. A species of songbird preys ...
Friday, February 3, 2017 by Anonymous

Science
If a bowling ball with a mass of 2.75kg. travels 27 meters in 7.6 seconds , how fast is it traveling?
Friday, February 3, 2017 by Daniel

science
A copper calorimeter weighs 100g when empty, 400g when half full of water at 0 degrees Celsius, and 450g when ice at 0 degree Celsius is added. When some steam is passed into the mixture, its temperature is raised by 10 degrees Celsius. Find the quantity of steam added
Friday, February 3, 2017 by agajere

science
A stone is dropped from a balloon going up with a uniform velocity of 5.0 m/s. If the balloon was 50 m high when the stone was dropped, find its height (in meters) when the stone hits the ground. Take g = 10 m/s2 (A) 50 (B) 58 (C) 68 (D) 78.5
Friday, February 3, 2017 by sam

science
The work of which scientist(s) helped to explain light's ability to propagate through a vacuum? A. Maxwell ==B. Davisson and Germer C. Fresnel, Fraunhofer, and Arago D. Newton An object that has a height of 0.4 meter is placed at a distance of 0.7 meter from a concave ...
Thursday, February 2, 2017 by please help

Science 6th grade
PLEASE HELP Explain why the outer planets did not lose the lighter gasses in the atmosphere.
Thursday, February 2, 2017 by Jewl

science
when building a house, wich of the following is a simple machine that a construction worker would use? A)plywood B)safety hat C)cement D)pulley
Thursday, February 2, 2017 by little kakashi hatake

science
remy noticed that after oiling his skateboard wheels,it was easier to reach the speeds he needed to preform tricks how did the oil help A) the oil reduced friction between the moving parts of the skateboard B)the oil increased friction between the moving parts of the ...
Thursday, February 2, 2017 by little kakashi hatake

science
you do 185 J of work pulling a cart up a ramp. if the ramp does 153 J of work,what is the efficient of the ramp? A)82.7 percent B)121.0 percent C)32.0 percent D)338.0 percent
Thursday, February 2, 2017 by little kakashi hatake

science
to chop wood you apply 50.0 N of force to an ax. the ax supplies 600.0 N of force to the wood. what is the mechanical advantage of the ax? A)650.0 B)8.3 C)12.0 D)0.0833
Thursday, February 2, 2017 by little kakashi hatake

science
a box of cleaning supplies weighs 15 N. if the box is lifted a distance of 0.60 m, how much work i sdone? A)0.040 J B)9 J C)14 J D)25 J
Thursday, February 2, 2017 by little kakashi hatake

Science
A car was travelling at the speed of 20m/s when the driver saw a cat on the road 40 m away. He step on the brake and the car came into a halt after 6 seconds. How far did the car travel. What will happen to the cat?
Thursday, February 2, 2017 by Cecile Bambalan

science
Define the photoelectric effect?
Thursday, February 2, 2017 by niraj

science
Depth of water in swimming pool is 1.5m. When we see from top the depth appears to be_.
Thursday, February 2, 2017 by light

maths
In a class, 22 offer maths, 21 offer English and 25 offer science. 4 students offer all three subjects and 36 offer exactly one subject. If all the students offer at least one of the subject, then how many offer two subjects?
Thursday, February 2, 2017 by Courage Danquah

science
calculate the moles of oxygen atom in 6.2 g of calcium carbonate?
Thursday, February 2, 2017 by j

science
Bacterium called pathogen. The example of a beaker with a single bacterium in it. That divides and doubles itself. If you place the first bacterium into the beaker, how much time it takes to half full? And how much time it takes to full? if we put a bacteria in 720 milliliter ...
Wednesday, February 1, 2017 by sameer

Science
In what levels are producers and tertiary consumers, respectively found in an energy pyramid? I am kind of lost on how I am supposed to determine what level a producer is at on a pyramid? Can you please help me with this.
Wednesday, February 1, 2017 by Donald

Science
Which level of consumer is an owl in the following chain: grass, cricket, mouse, and owl? I do not know understand this at all can you please explain this so I can get a better understanding of this?
Wednesday, February 1, 2017 by Donald

Science
What factor is described when low water levels are causing animals to die from dehydration? I am confused on this. Please help. I don't even know where to begin looking
Wednesday, February 1, 2017 by Donald

Science
What structure traps the pollen
Wednesday, February 1, 2017 by Garth

science, pysics
A child having a mass of 37 kg sits 0.2 m from the center of a merry-go-round that is rotating with a period of 36 s. What is the centripetal force acting on the child? What is the centripetal force in Newtons?
Wednesday, February 1, 2017 by Kat

physics, science!
A child having a mass of 37 kg sits 0.2 m from the center of a merry-go-round that is rotating with a period of 36 s. What is the centripetal force acting on the child? What is the centripetal force in Newtons?
Wednesday, February 1, 2017 by Kat

physics, science!!!
A child having a mass of 37 kg sits 0.2 m from the center of a merry-go-round that is rotating with a period of 36 s. What is the centripetal force acting on the child?
Wednesday, February 1, 2017 by Kat

physics, science
What centripetal force is needed to keep a 10 kg object moving at a constant speed of 10 m/s in a circle having a radius of 11 m?
Wednesday, February 1, 2017 by Kat

Science
What is the average velocity of a car that moved 25 km east and 40 km wear in 2 hours
Wednesday, February 1, 2017 by Kalira

science
Which of the following set of terms could be used in a description of the peripheral nervous system? A)motor neurons and sensory neurons B) brain and spinal cord C)motor neurons and brain D) sensory neurons and spinal cord
Wednesday, February 1, 2017 by HELP

Science
During a lunar eclipse, does the Moon enter the Earth’s shadow from the east or the west? Explain your answer. Wouldn't it be the east because that's the same way the moon rises normally? So if it normally rises in the east it would do that again.. or would it be west ...
Wednesday, February 1, 2017 by Mykayliah

science
what word can these letters make rorpsfgnloadeeas?
Wednesday, February 1, 2017 by Ranell

science
what do you think should be the motion of an airplane preparing for take off?
Wednesday, February 1, 2017 by abbey

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