Thursday
July 30, 2015

Homework Help: Science

Branches of Science

Recent Science Questions

Science
In the ocean, there are areas where there are very few living things. ____________ is the term that describes when this happens to a natural area.
Thursday, June 4, 2015 by Alina

Science
If 15% of the radioactive material decays in 5 days, what would be the percentage of amount of original material left after 25 days?
Thursday, June 4, 2015 by Anonymous

paramedic science
The male person on-scene is complaining of abdominal pain but refuses any treatment or transport going against your advice. He has obvious bruising to his abdomen consistent with a seatbelt injury. Using Queensland Ambulance Service protocols as a guide - discuss what steps ...
Thursday, June 4, 2015 by JOhn

Science
A 13.0 kg block of concrete rests on a 5 cm by 2 cm board. What is the acceleration of the block of concrete here on Earth?
Wednesday, June 3, 2015 by Ally

science
1. The images above show particles in a medium. Which of the following shows the worst conditions for a sound wave travel? A B C D is the answer A? Which of the following correctly describes a radio wave? A long wavelength and high frequency B long wavelength and low frequency...
Wednesday, June 3, 2015 by Unknown

science
Light waves strike a lamp shade. What property of light is demonstrated? diffuse reflection* diffraction refraction regular reflection
Wednesday, June 3, 2015 by starbuckshelp

Science
Which of the following correctly describes a radio wave? long wavelength and high frequency long wavelength and low frequency short wavelength and low frequency short wavelength and high frequency 3. When the energy of a light wave is transferred to a particle and causes it ...
Wednesday, June 3, 2015 by justuknown

science
I want to write a CV , could you help and notice me how to do it ? with respects
Tuesday, June 2, 2015 by MAD

science
electric charges that are different A. attract each other B. Repeal each other C. exist in pair D. DO not interact
Tuesday, June 2, 2015 by briana

Science Help Plzz
1. The images above show particles in a medium. Which of the following shows the worst conditions for a sound wave travel? A B C D is the answer A? Which of the following correctly describes a radio wave? A long wavelength and high frequency B long wavelength and low frequency...
Tuesday, June 2, 2015 by Diana

Earth science
Hello! Does Jiskha have Earth Science tutors? If not, could someone direct me to a site where I could ask for help? My questions regard finding out specific heat capacity and heat of fusion and heat of vapourization of water. Thank you!
Monday, June 1, 2015 by Lucina

science
Could someone who goes to connexus academy Please please please give me the answers to Human Impact on the Environment Unit Test pretty please im stressed out and im backed up.please please help i will repay you! please!!!! and please may they be the CORRECT answer. Thank you ...
Monday, June 1, 2015 by lizzy

Science
A plane is flying horizontally with speed 215 m/s at a height 2770 m above the ground, when a package is dropped from the plane. The acceleration of gravity is 9.8 m/s^2. Neglecting air resistance, when the package hits the ground, the plane will be _________. Can anyone ...
Monday, June 1, 2015 by Kim

Science
Calculate the energy of a photon of ultraviolet light of wavelength 200nm
Monday, June 1, 2015 by Tebogo

Science
Which of the following is not a characteristic of natural selection? A. More offspring are born than will survive to reproduce. B. Mutations appear randomly. C. Breeding pairs are chosen by humans. D. Organisms that are better adapted are more likely to survive.
Sunday, May 31, 2015 by Zeana

Agricultural Science,Business Studies,History,Life Orientation.
I do the following subjects:Agricultural Science,Business Studies,History,Life Orientation and Two Languages.And Im wondering What kind of A Job can I get and which college/university can Go to? .. Please Help
Sunday, May 31, 2015 by Ezethu Sizani

Science
When 1.23g of ethanol (delta c Hm = -1368kj/mol at 25 C ) is burned in an adiabatic flame calorimeter, the temperature increases by 8.6 C. Under the same experimental conditions, when 1.14g of 1-propanol is burned, the temperature increases by 9.0 C. What is delta c Hm for 1-...
Saturday, May 30, 2015 by Nancy

Science
A solution containing 3.22g of solute in 40.0g of 1,4-dichlorobenzene and its freezing point is 49.2 C. Calculate the molar mass of the solute.
Saturday, May 30, 2015 by Nancy

science
1. Descriptive statistics are widely used in qualitative research. When establishing if a population is normally distributed explain when the statistics of sample size, mean, mode, median, skewness and kurtosis will guide the researcher to make conclusions of a normal ...
Saturday, May 30, 2015 by jonathan

Science
What is the percentage composition of copper, Cu, in Cu20? A. 44% B. 80% C. 89% D. 133% I Choose C, Am I correct?
Friday, May 29, 2015 by Giovanna

science
A ball with a mass of 3.47 kg is rolling along at 17.4 m/s. If you apply a force of 52.2 N to it, how many seconds will it take to stop?
Thursday, May 28, 2015 by zach

science (cladogram)
How would a scientist use DNA or protein sequences from three different organisms to construct a cladogram?
Thursday, May 28, 2015 by anonymous

science
What is the power of a 900 n force applied over a distance of 40 m for 45 sec?
Thursday, May 28, 2015 by Sarah Moyer

science
the ratio of velocities of two object a and b is 1:3. if the position-time graph of object a is inclined to time axis at 30degree then the position-time graph of object b is inclined to time axis at
Thursday, May 28, 2015 by pari

Science (theory of evolution)
How would a scientist use DNA or protein sequences taken from three different organisms to construct a cladogram.
Wednesday, May 27, 2015 by anonymous

Science
Assuming a warm front is moving into the area, there is a stignant (non moving) cold air mass around New York, what type of precipitation might be expect? How long might it last?
Wednesday, May 27, 2015 by Dre

Science
If it is snowing in Great Neck, what type of air mass must be present?
Wednesday, May 27, 2015 by Blake

Science
Why can cold air masses from Canada make it all the way down to the Gulf of Mexico?
Wednesday, May 27, 2015 by J.J

Science
Describe what would happen if a positively charged sodium ion and a negatively charged chlorine ion came into contact?
Wednesday, May 27, 2015 by Trent

science
What happens when a warm humid air mass meets a cold dry mass?
Wednesday, May 27, 2015 by Kim

Science
Why are Canadians air masses considered to be dry air masses?
Wednesday, May 27, 2015 by Kimber

science
How would a scientist use DNA or protein sequences taken from three different organisms to construct a cladogram.
Wednesday, May 27, 2015 by Anonymous

Science
If the volume of a balloon is 5.0 L at 22 degrees Celsius, what will be the new volume if the balloon is heated to 75 degrees Celsius? Should the volume increase or decrease? 5/22=x/75 x=17.045
Wednesday, May 27, 2015 by Ethan

Science
Which of the following describes the use of a renewable energy source? A. using natural gas to heat a house B. using a windmill to grind grain C. using petroleum to run a car D. using coal to generate electricity I think the answer is B.
Wednesday, May 27, 2015 by sTudent

Science
1. Which of the following is the most effective way to preserve biodiversity? A) Captive breeding B) Habitat destruction C) Habitat preservation D) Habitat fragmentation I think its A)
Wednesday, May 27, 2015 by sTudent

Science (Physics)
A 33.3 kg cyclist is riding a 10.7 kg bicycle at a velocity of 7.0 m/s. If the cyclist applies a brake that applies a force of 42.7 N, what is the time required for the cyclist to come to a stop?
Wednesday, May 27, 2015 by Jazmin

science
which of the following has the largest nos of oxygen atom. 1- 1 gm of oxygen atom 2- 1 gm o^2 3- 1 gm of ozone
Wednesday, May 27, 2015 by divyam arora

Science
I need help with questions regarding information about the Galapagos Island volcano. 1. where is the volcano located 2. how long has it been active 3. what kind of volcano is it 4. is it dangerous 5. what is the surrounding area like 6. what else is there to do in the ...
Wednesday, May 27, 2015 by Chan

science
Why does a light go out when you turn off the wall switch? A. The switch changes the direction of the flow of electrons. B. The switch causes a break in the circuit. C. The switch changes the circuit from series to parallel. D. The switch absorbs the electrical energy.
Tuesday, May 26, 2015 by Anonymous

Science (theory of evolution)
How has the fossil record support the theory of evolution?
Tuesday, May 26, 2015 by Anonymous

Science (theory of evolution)
How has the genetic code support the theory of evolution?
Tuesday, May 26, 2015 by Anonymous

Science
What are some unexplained aspects of the future of fossil fuels and other energy?
Tuesday, May 26, 2015 by Anonymous

SCIENCE!! PLEASE HELP!!! CHECK ANSWERS PLZ
1)When evolution was first proposed, which of the following was used as evidence to support the idea? (1 point) A)observations of nature*** B)laboratory experiments C)extensive fossil collections D)genetic sequences 2)How did Darwin and Lamarck differ in their thinking about ...
Tuesday, May 26, 2015 by .....

science
what happens to insulin when kidney failure happens?
Monday, May 25, 2015 by mmv

science
A ping pong ball and a penny are placed in water. The ping pong ball floats while the penny sinks? What property of water does this demonstrate? I think it has to do with the density. The reason the ping pong ball floats is because it has a lower density than the water. The ...
Monday, May 25, 2015 by mmv

science
If A represents atomic mass and Z represents atomic number, which of the following describes an atom after a proton is emitted from its nucleus? A. A+ 1, Z + 1 B. A-1,Z-1 C. A+ 1, Z-1 D. A-1, Z + 1 My answer is B
Monday, May 25, 2015 by sandra

earth science
_____ currents assist in the transfer of energy from warmer climates to cooler climates
Monday, May 25, 2015 by dustin

4th grade Science (Please Help!)
Bowl A and Bowl B are filled with the same amount of water. Bowl A is covered in plastic wrap. Both bowls are left on a counter. The water level is checked in both bowls after 1 week. What is the independent variable? PLEASE HELP.
Sunday, May 24, 2015 by Yellow

4th grade Science (Please Help!)
Bowl A and Bowl B are filled with the same amount of water. Bowl A is covered in plastic wrap. Both bowls are left on a counter. The water level is checked in both bowls after 1 week. What is the hypothesis? Please HELP!
Sunday, May 24, 2015 by Yellow

Science
what is the combination of waves?
Sunday, May 24, 2015 by Andre

science
What are some scientific terms for metal rust
Sunday, May 24, 2015 by JImmy

Science
When an oxygen atom forms an ion, it gains two electrons. What is the electrical charge of the oxygen ion? A. +2 B. -1 C. -2 D. +1
Saturday, May 23, 2015 by Jamal

science
Plant-deer-tiger The first step in the energy chain that created the bonds of proteins in the tiger's muscle cells in the food chain shown above is A. deer the tiger ate B. plant the deer ate C. photons the sun made D. carbohydrates the plant made I think its A because by ...
Saturday, May 23, 2015 by mandi

science
Moths with certain coloring are camouflaged in their habitat. Over time, more moths are born with this coloring. Which of the following best explains the increasing number of moths with this coloring? A. Natural selection B. Gene flow C. genetic drift D. sexual selection I ...
Saturday, May 23, 2015 by mandi

Science
A spherical object made of stone is dropped into a container of water and sinks to the bottoms of the container causing 30N of water to spill out. What is the estimated gravitational force of the object?
Saturday, May 23, 2015 by Ally

Science and maybe re
This isn't really homework, but I thought someone could really help me with this. Did time exist before the Big Bang? I believe in God; if time always existed, why did he make it wait? Looking for a really scientific explanation. Thanks!
Saturday, May 23, 2015 by Science

Science
A balloon filled with air is taken up a mountain with hiker. What is the pressure exerted on the balloon at sea level?
Friday, May 22, 2015 by Theresa

Science
What is the most popular non-renewable energy source?
Friday, May 22, 2015 by Anonymous

Science
Determine the final temperature when 100 g of water absorbs 1000 J of thermal energy, given that the initial temperature of the water is 20.0°C. The theoretical specific heat capacity of water is 4.19 J/g·°C. Show your work below.
Friday, May 22, 2015 by Desirae

7th Grade Science
1. Which of the following statements about continental glacial movement is correct? A. Continental glaciers can only flow uphill. B. Continental glaciers can flow in all directions *** C. Continental glaciers can only flow downhill. D. Continental glaciers do not flow at all. ...
Friday, May 22, 2015 by Aleksander

Science
How does friction affect the height that a ball will bounce? Can you give a hypothesis too of what i'll need to do please!? I'm confused
Friday, May 22, 2015 by Rock

Science
How does friction affect the height that a ball will bounce? Can you give a hypothesis too of what i'll need to do please!? I'm confused
Friday, May 22, 2015 by Ellie_Fan

Science- 8th grade- please help!!
1) What evidence is there that the human species has been successful so far? Explain. 2) What environmental pressures in the past do you think were most important in shaping the human species as it exists today? 3) What environmental pressures exist now that you think may be ...
Thursday, May 21, 2015 by Savannah H

science (theory of evolution)
1.What is two pieces of evidence used to support theory of evolution? Do you guys think it would be alright if I said that they observed nature. And also if you guys could help me come up with another example I would REALLY appreciate it!!
Thursday, May 21, 2015 by anonymous

science
when you turn a television on, you transfer electrical energy into __. choose all that apply. a heat energy b light energy c elastic potential energy d sound energy
Thursday, May 21, 2015 by Anonymous

science
An electric stove transfers heat too a pot by a.) conduction b.) convection c.) radiation d.) friction
Thursday, May 21, 2015 by alyssa

Science
Can you give me help understanding this question? A skydiver prepares to jump out of a plane. Explain how gravity and air resistance will affect the motion of the skydiver before and after he or she opens the parachute.
Thursday, May 21, 2015 by Stephanie

GEN 499
Question 25. 25. <21{8[1(07)95]}> Political science professor: Many people insist that the Internet is revolutionizing the political process. They argue that Internet debates and online political polls and chat rooms give people greater access to political information. ...
Thursday, May 21, 2015 by Mr. Doc

Science
what happens immediately before a volcano erupts ? a) magma collects in the mantle** b) lava hardens to form volcanic rock c) expanding gases pushes magma through the pipe d) the temperature in the magma chamber decreases
Wednesday, May 20, 2015 by Anonymous

Science
Okay, so I have been working on this question for about two weeks...craxzy right?! BUt help 1. How does salinity affect the temperature and density of water?
Wednesday, May 20, 2015 by Meep

physical science
The force of gravity acting on a body is 675 newtons. find the mass of the body to the nearest kilograms.
Wednesday, May 20, 2015 by Anonymous

physical science
Why is the atmosphere pressure lower on a high mountain peak than at sea level?
Wednesday, May 20, 2015 by Anonymous

science
1. How is an area’s topography determined? (1 point) A.by using an area’s longitude and latitude B.by using an area’s scale C.by using an area’s elevation, relief, and landforms*** D.by using an area’s elevation, longitude, and latitude 2. How do ...
Wednesday, May 20, 2015 by .... :)

science
A patient takes the recommended dosage of painkiller pills, but does not feel any immediate effect. What should the patient do next?
Wednesday, May 20, 2015 by xezavious

science
the cake is sititing on table with a gravitation force of 57.6 and a normal force of 57.6 what is the sum of all forces
Wednesday, May 20, 2015 by Anonymous

physical science
What is the momentum, in kg-m/s of a 54,000 kg ship going 12 mph?
Tuesday, May 19, 2015 by Anonymous

physical science
How many kilojoules are required to melt 5 lbs of gold if its initial temperature is 1000 K?
Tuesday, May 19, 2015 by Anonymous

Science
How can using biomass fuels instead of gasoline in car engines help conserve natural resources? a. I makes cars run faster. b. It burns more fossil fuels. c. It reduces the use of coal.<---- d. It uses a renewable resource.
Tuesday, May 19, 2015 by Anonymous

science
During a reaction of ca(oh)2 with carbon dioxide gas, 20g of solid caco3 is formed. calculate the mass of the nahco3 needed to produce the amount of carbon dioxide gas responsible for forming the caco3 precipitation.
Tuesday, May 19, 2015 by lusi sinuma

Science
Name the Pb (NO³)²
Tuesday, May 19, 2015 by Pb (NO&#179;)&#178;

science
What is mixture?
Tuesday, May 19, 2015 by Mixture

Science
1. What type of map would you use to locate the mountain ranges on a continent? idk!
Tuesday, May 19, 2015 by Meep

Science (Chemistry)
So all I have to do now is cross multiply and solve for x right? Also when that happens, how do I factor the x^3? What do I do?
Tuesday, May 19, 2015 by Kibito

Science (Chemistry)
Hello DrBob222 Regarding the answer you gave me thank you very much. However when you expand the denominator, I don't get -0.14 but I get -0.28. I get that because when I first expand I get 0.0049 - 0.14x - 0.14x + 4x^2. So when I simplify that I get -0.28x. So could you ...
Tuesday, May 19, 2015 by Kibito

Science
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. ...
Tuesday, May 19, 2015 by Tom

science
How would the ecosystem’s carrying capacity for a species change, if the species cannot adapt to changes of habitat?
Tuesday, May 19, 2015 by Shay

science
What can happen to an animal species if it cannot adapt to changes taking place in its habitat?
Tuesday, May 19, 2015 by Shay

science
Which of the following is the best course of action when it comes to using natural resources? A. Only nonrenewable resources should be carefully managed B. Only renewable resources should be carefully managed C. Conservation should be implemented for both renewable and ...
Tuesday, May 19, 2015 by Anonymous

science
How many joules of heat is required to change 40.0g of ice at 0degrees Celsius to liquid water at 0 degrees Celsius.
Tuesday, May 19, 2015 by hilda

science (any tutor)
Which kind of pollution is illustrated by a pipe gushing polluted water into a river? A. Point source*** B. Nonpoint source C. Carbon source D. Resource source
Tuesday, May 19, 2015 by Anonymous

Science (Chemistry)
A chemical system within a sealed 1 L reaction vessel is described by the following reversible reaction equation: 2H2S(g) <---> 2H(g) + S2(g) If the equilibrium constant is 0.000 004 200 at 1103 K find: (a) the reaction quotient intially (b) the order of concentration of...
Tuesday, May 19, 2015 by Kibito

science
when 8.4 g of NaHCO3 is added to a solution of CH3COOH weighing 20 g .It is observrd that 4.4 g of CO2 is releasd into atmosphere and a residue is left behind .calculate the mass of residue by applying law of conservation of mass .
Tuesday, May 19, 2015 by vishal

science
the resultant of two forces 13n and 20 n is f if the first forces is doubled the resultant is also doubled to 2f find the angle betwen the two forces
Monday, May 18, 2015 by physics

science
how physical/mechanical and chemical weathering different?
Monday, May 18, 2015 by Natalie

science
how are physical/mechanical and chemical weathering alike?
Monday, May 18, 2015 by Natalie

Science (Chemistry)
A chemical system within a sealed 1 L reaction vessel is described by the following reversible reaction equation: 2H2S(g) <---> 2H(g) + S2(g) If the equilibrium constant is 0.000 004 200 at 1103 K find: (a) the reaction quotient intially (b) the order of concentration of...
Monday, May 18, 2015 by Kibito

Science
Sorry Ms Sue I forgot to separate them A species of flowering plant produces vibrant blue flowers. The flowers attract both pollinators that spread the plant's pollen and herbivores that feed on the plant. An adaptation occurred through several generations of plant species...
Monday, May 18, 2015 by anonymous

Science
Can you please help me answer just a couple questions A species of flowering plant produces vibrant blue flowers. The flowers attract both pollinators that spread the plant's pollen and herbivores that feed on the plant. An adaptation occurred through several generations ...
Monday, May 18, 2015 by anonymous

Science
How could sustainable use preserve biodiversity in hot spots?
Monday, May 18, 2015 by M

Science
During a space shuttle landing, a parachute deploys from the back of the shuttle as it taxis down the runway. In addition to the speed brake, the parachute helps the shuttle come to a complete stop. How does the parachute help during this process? A. It increases the weight of...
Monday, May 18, 2015 by Connie

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