Saturday
May 30, 2015

Homework Help: Science

Branches of Science

Recent Science Questions

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 at 6:06pm

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 at 11:44pm

science (cladogram)
How would a scientist use DNA or protein sequences from three different organisms to construct a cladogram?
Thursday, May 28, 2015 at 8:17pm

science
What is the power of a 900 n force applied over a distance of 40 m for 45 sec?
Thursday, May 28, 2015 at 5:05pm

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 at 1:19am

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 at 10:04pm

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 at 9:59pm

Science
If it is snowing in Great Neck, what type of air mass must be present?
Wednesday, May 27, 2015 at 9:42pm

Science
Why can cold air masses from Canada make it all the way down to the Gulf of Mexico?
Wednesday, May 27, 2015 at 8:13pm

Science
Describe what would happen if a positively charged sodium ion and a negatively charged chlorine ion came into contact?
Wednesday, May 27, 2015 at 7:56pm

science
What happens when a warm humid air mass meets a cold dry mass?
Wednesday, May 27, 2015 at 7:56pm

Science
Why are Canadians air masses considered to be dry air masses?
Wednesday, May 27, 2015 at 7:50pm

science
How would a scientist use DNA or protein sequences taken from three different organisms to construct a cladogram.
Wednesday, May 27, 2015 at 7:25pm

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 at 5:35pm

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 at 1:43pm

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 at 1:29pm

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 at 11:07am

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 at 2:54am

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 at 12:09am

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 at 11:20pm

Science (theory of evolution)
How has the fossil record support the theory of evolution?
Tuesday, May 26, 2015 at 8:04pm

Science (theory of evolution)
How has the genetic code support the theory of evolution?
Tuesday, May 26, 2015 at 8:03pm

Science
What are some unexplained aspects of the future of fossil fuels and other energy?
Tuesday, May 26, 2015 at 12:13pm

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 at 9:18am

science
what happens to insulin when kidney failure happens?
Monday, May 25, 2015 at 5:28pm

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 at 5:17pm

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 at 3:24pm

earth science
_____ currents assist in the transfer of energy from warmer climates to cooler climates
Monday, May 25, 2015 at 10:56am

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 at 2:47pm

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 at 1:30pm

Science
what is the combination of waves?
Sunday, May 24, 2015 at 1:09pm

science
What are some scientific terms for metal rust
Sunday, May 24, 2015 at 12:11pm

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 at 9:55pm

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 at 7:28pm

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 at 7:08pm

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 at 4:06pm

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 at 2:21pm

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 at 10:24pm

Science
What is the most popular non-renewable energy source?
Friday, May 22, 2015 at 9:03pm

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 at 8:04pm

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 at 4:15pm

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 at 12:51pm

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 at 12:15pm

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 at 10:17pm

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 at 6:32pm

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 at 3:31pm

science
An electric stove transfers heat too a pot by a.) conduction b.) convection c.) radiation d.) friction
Thursday, May 21, 2015 at 3:28pm

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 at 2:14pm

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 at 11:07am

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 at 6:06pm

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 at 5:16pm

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 at 4:25pm

physical science
Why is the atmosphere pressure lower on a high mountain peak than at sea level?
Wednesday, May 20, 2015 at 4:08pm

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 at 3:45pm

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 at 3:10am

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 at 1:08am

physical science
What is the momentum, in kg-m/s of a 54,000 kg ship going 12 mph?
Tuesday, May 19, 2015 at 11:53pm

physical science
How many kilojoules are required to melt 5 lbs of gold if its initial temperature is 1000 K?
Tuesday, May 19, 2015 at 11:51pm

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 at 8:44pm

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 at 5:49pm

Science
Name the Pb (NO³)²
Tuesday, May 19, 2015 at 5:30pm

science
What is mixture?
Tuesday, May 19, 2015 at 5:23pm

Science
1. What type of map would you use to locate the mountain ranges on a continent? idk!
Tuesday, May 19, 2015 at 5:14pm

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 at 4:45pm

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 at 4:35pm

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 at 3:48pm

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 at 3:42pm

science
What can happen to an animal species if it cannot adapt to changes taking place in its habitat?
Tuesday, May 19, 2015 at 3:41pm

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 at 2:42pm

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 at 2:08pm

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 at 2:03pm

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 at 10:16am

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 at 5:52am

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 at 10:56pm

science
how physical/mechanical and chemical weathering different?
Monday, May 18, 2015 at 8:25pm

science
how are physical/mechanical and chemical weathering alike?
Monday, May 18, 2015 at 7:57pm

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 at 7:02pm

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 at 6:46pm

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 at 6:32pm

Science
How could sustainable use preserve biodiversity in hot spots?
Monday, May 18, 2015 at 6:26pm

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 at 4:27pm

science
A bicycle tire is filled with air to a pressure of 6.80 atm and a temperature of 19 degrees Celsius. Riding the bike on asphalt on a hot day increases the temperature of the tire to 58 degrees Celsius. The volume of the tire increases by 4.0%.What is the new pressure in the ...
Monday, May 18, 2015 at 4:09pm

science (any tutor)
Similarities in the early development of chickens and opossums suggest that these organisms share a________. common ancestor???
Monday, May 18, 2015 at 4:04pm

science (any tutor)
a farmer sprays insecticide on his crops and notices that the insect pest problems disappear. a year later he tries the same insecticide only to find that he did not achieve the same result. the insect population shows resistance to the insecticide.This is na example of _____ ...
Monday, May 18, 2015 at 3:57pm

science school
A body of mass 20g appears to have a mass of 13g in oil and 12g in water what is the relative density of oil.
Monday, May 18, 2015 at 3:47pm

science (any tutor)
Narwhals are aquatic mammals known for the giant tusk that protrudes from their upper lip. These mammals live in artic waters and can spend more than three hours at a time underwater at great depths that would crush other animals. The narwhal's ability to endure such long ...
Monday, May 18, 2015 at 3:36pm

science (any tutor)
Similarities in the early development of chickens and opossums suggest that these organisms share a________. common ancestor???
Monday, May 18, 2015 at 3:24pm

science (any tutor)
Very few fossils of jellyfish or their close relatives have been found. This makes it hard to trace the evolutionary history of jellyfish using the fossil record. What explains this? A. Jellyfish fossils are buried deep under the ocean floor, not in land areas where scientists...
Monday, May 18, 2015 at 2:53pm

science (any tutor)
Luther Burbank was a plant breeder who developed a strain of potato plant that produced more tubers (the part of the root that people eat) of larger size than other potato plants that were grown on farms at the time. This strain of potato was also resistant to the potato ...
Monday, May 18, 2015 at 2:36pm

science (any tutor)
2. How did Darwin and Lamarck differ in their thinking about change in species? A.Darwin thought that organisms could induce their own changes, while Lamarck thought that change could only be induced by an organism’s environment. B.Darwin thought that change could occur ...
Monday, May 18, 2015 at 2:27pm

science (any tutor)
3. Luther Burbank was a plant breeder who developed a strain of potato plant that produced more tubers of larger size than other potato plants that were grown on farms at the time. This strain of potato was also resistant to the potato blight that had wiped out the potato ...
Monday, May 18, 2015 at 2:24pm

Ms. Sue PLZ HELP!!!(science)
When evolution was first proposed, which of the following was used as evidence to support the idea? A. observations of nature *** B. laboratory experiments C. extensive fossil collections D. genetic sequences
Monday, May 18, 2015 at 2:08pm

science
a body of mass 5kg is thrown to a height of 100m.what is its potential energy at the maximum height.?
Monday, May 18, 2015 at 2:06pm

science
calculate the volume of gas at STP that is produced when 1g of silver nitrate is heated. the unbalanced reaction is: AgNO3(s)=Ag(s)+NO2(g)+O2(g)
Monday, May 18, 2015 at 12:04pm

Science 8
I need help on this portfolio project, I have to do a lab report on light refraction. The research question is "How does change in medium affect light?" and I need to make a hypothesis, but I don't know what to put.
Sunday, May 17, 2015 at 9:28pm

WEATHER SCIENCE SOS! I NEED ANSWERS CHECKED! SOS
How does latitude affect climate? a.) Areas near the equator have cooler climates than areas far from the equator. b.) Areas near the equator have warmer climates than areas far from the equator.*** c.) areas near the equator have 4 seasons.*** d.) areas near the equator do ...
Sunday, May 17, 2015 at 8:05pm

Science
What is the similarities between conduction and radiation What is the similarities between convection and radiation
Sunday, May 17, 2015 at 1:41pm

science
if the actual mass of oxide at the end of the experiment is 130g, what is percentage yield?
Sunday, May 17, 2015 at 10:44am

science
name four principles of kinetic friction
Sunday, May 17, 2015 at 9:02am

science
How many kcal of heat energy are removed from the body with every 1 L of sweat?
Sunday, May 17, 2015 at 1:29am

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