Branches of Science
Recent Science Questions
what is an uncertainty? From reading the internet, is it a way to express potential error and that the actual value is between +/-#? what would be the uncertainty for this: electronic balance measuring to the tenth of a gram? is it +/- 0.05?
Saturday, November 22, 2014 at 12:21pm
As an object get farther from earth is A. its weight increase B.it weight decrease C. it mass decrease D. it weight remains the same I am not sure but is it A(or b)
Friday, November 21, 2014 at 8:01pm
which of the following shows the path followed by nerve impulses in a reflex motor neurons,interneurons in brain,sensory neurons or sensory neurons,interneurons in brain, motor neurons
Friday, November 21, 2014 at 7:36pm
Which of the following is not a goal of the clean water act? A. Controlling water pollution from point sources B. Encouraging voluntary cooperation by citizens related to nonpoint sources of pollution. C. Educating citizens about the importance of reducing pollution D. ...
Friday, November 21, 2014 at 7:11pm
Which of the following statements describes the conservation od a natural resource? A. A factory burns coal to run its machines. B. A solar energy company harvests energy from sunlight. C. Lights in a house are turned off when not in use. D. A wind energy company covers a ...
Friday, November 21, 2014 at 6:46pm
Renewable resources are considerered better for the enviorment because A. They are less expensive to harness. B. Once they are harnessed, they can be replaced. C. They do not cause any pollution. D. Using renewable resources encourages people to plant more trees. Is the answer...
Friday, November 21, 2014 at 6:36pm
The process of desertification can occur when A. Plants usually found in the desert replace trees that have been cut down. B. Farmers use contour farming techniques. C. An area of forest is clear-cut. D. An area of forest is selectively cut. Is the answer C? Thank you
Friday, November 21, 2014 at 6:27pm
Using coal for fuel releases pollution into the atmosphere. Why do people continue to use coal if it causes pollution? A. Using more coal reduces the amount of pollution from using oil. B. Using coal is realtivly inexpensive. C. Mining coal helps scientists unconver fossils. D...
Friday, November 21, 2014 at 6:13pm
Selectively cutting down trees on an area of land can best be describes as A. Cutting down certain trees while leaving other trees standing. B. Cutting down all of the trees and smaller plants. C. Cutting down none of the trees on the land. D. Cutting down ass of the trees ...
Friday, November 21, 2014 at 6:04pm
How thick is the epidermis as compared to the dermis as compared to the subcutaneous layer? Is there a comparison? If not, then how thick is the epidermis, dermis, and subcutaneous in thick skin?
Friday, November 21, 2014 at 6:02pm
A swimming pool measures 10m by 7m by 2m calculate the full force exerted by the water against the bottom. What is the pressure at the bottom due to the water?
Friday, November 21, 2014 at 5:15pm
Earth Science - NEED HELP QUICK
What is the thickness of the layer from 1000 - 850 mb if the mean temperature of the layer is 2 C? From what it says in my textbook it seems as if mb = hPa so all you do is 850 - 1000 = -150 hPa but I am pretty sure that is wrong because what do you do with the temperature?? ...
Friday, November 21, 2014 at 8:41am
i have BaCl2.2H2O ,how can i get BaCl2.6H2O from it. or i have CuCl2.2H2O how can i get CuCl2.6H2O from it. actually i am working in the field of nanotechnology. trying to prepare nano-ferrites. now am trying to prepare copper doped barium hexaferrites.help me if u can
Friday, November 21, 2014 at 3:08am
Use angular momentum arguments to describe why a parcel of air moving from the equator towards the North Pole will be deflected to the east. It may be helpful to show equations in your response. THANKS
Thursday, November 20, 2014 at 8:44pm
So in school, I am doing a " planet paper roll comparison " So the scale of the diameter of one planet is 0.943cm or something.. How do I measure it on paper?
Thursday, November 20, 2014 at 8:14pm
Two train cars are connected to a locomotive as shown. Wach train has a force of kinetic friction equal to 50,000N. The locomotive pulls the two freight cars at a constant speed of 4.0m/s. Find the force of tension at each of the coupling points A & B.
Thursday, November 20, 2014 at 5:13pm
Use angular momentum arguments to describe why a parcel of air moving from the equator towards the North Pole will be deflected to the east. It may be helpful to show equations in your response.
Thursday, November 20, 2014 at 4:58pm
Science help URGENT
Muscles located in the walls of the small intestine help push digested material along. Muscles located in the walls of arteries help push blood along. Based on this information and your understanding of muscle types, which of the following statements is correct? Both sets of ...
Thursday, November 20, 2014 at 4:48pm
int.science gtg in 8 min.
How much heat is contained in 100 kg of water at 60.0 °C? Be mindful of significant figure rules for both multiplication and addition. 30 kcal 2.10 x 104 kcal 2.40 x 104 kcal 2.77 x 104 kcal
Thursday, November 20, 2014 at 2:22pm
How much energy is needed to heat and melt 3.0 kg of copper initially at 83°C? Be mindful of significant figure rules for both multiplication and addition. 450 kcal 430 kcal 280 kcal 130 kcal
Thursday, November 20, 2014 at 2:08pm
One reason people around the world use coal as an energy source is A. It is nonrenewable B.it can be found many places C.it is a fossil fuel D. It cannot be used up Is the answer C?
Thursday, November 20, 2014 at 12:52pm
Science, just need answers checked PLEASE
3. Which of the following is NOT a factor that affects the rate of weathering in rocks? A. biological evolution B. climate C. rock characteristics D. amount of exposed surface area 6. In a well-developed soil profile, which horizon is the uppermost layer? A. the C horizon B. ...
Thursday, November 20, 2014 at 11:39am
Someone please help me. :( Compare your models of the four haploid cells with those of other groups. Describe and explain any variation that you observe.
Thursday, November 20, 2014 at 10:28am
What force do you need to push on a large crate to accelerate it at 1.8m/s2 across a rough floor? The crate has mass 32kg and the coefficient of kinetic friction between the crate and floor is 0.57
Thursday, November 20, 2014 at 10:05am
1. A student lifts his 2.0-kg pet rock 2.8m straight up. He then lets it drop to the ground. Use the Law of Conservation of Energy to calculate how fast the rock will be moving ..... a. half way down b. just before it hits the ground 2. A 65-kg girl is running with a speed of ...
Wednesday, November 19, 2014 at 10:15pm
6 grade science
Which is not an example of stimulus A. the smell of baking bread B. the sound of your alarm clock in the morning C. the scream you give when someone scares you d.the light from the sun I think it is C. because the scream is the reaction to the stimuli, someone doing the ...
Wednesday, November 19, 2014 at 9:53pm
Originally the camera was made to capture a moment in time quickly and exactly. Paintings often reflected the opinion of the painter in their art, however, photos show exactly what was happening. Photos can be biased but nonetheless they are real. Photography started becoming ...
Wednesday, November 19, 2014 at 6:50pm
Science 7th Grade
Ms. Sue, I promise if you help me I will never ask for help on anything ever again. I just really need help. see im in connections academy but im moving to texas and texas has wierd laws so i have to go back to public school, and i really need to get my grades up i mean i have...
Wednesday, November 19, 2014 at 11:46am
Science biodiversity(asap please!)
The panther(species Puma concolor coryi) lives in Florida. At present, there are fewer than 100 of these panthers living in the wild, and the species is considered endangered. A controversial breeding program has been set up that s moving females of a subspecies of panther, ...
Wednesday, November 19, 2014 at 11:38am
The components of a traditional analysis model (data flow diagrams, process definitions, entity-relationship diagrams, and data definitions) were developed in the 1970s and 1980s as part of the traditional structured analysis methodology. How well do the components fit ...
Monday, November 17, 2014 at 10:40pm
A copper bracelet is placed in a graduated cylinder full of water. The water level rises from 15.6 ml to 28.0ml. The mass of the bracelet is 101.7g. Is the bracelet made of pure copper? How would I know? How would I explain?
Monday, November 17, 2014 at 8:22pm
Which of the following displays the correct order of structures urine passes through as it is processed by the urinary system? nephron, ureter, urinary bladder, urethra ureter, urinary bladder, nephron, urethra urinary bladder, urethra, nephron, ureter urethra, nephron, ureter...
Monday, November 17, 2014 at 1:12pm
1. Which organisms are capable of converting gaseous nitrogen in the air into a form that other living organisms can use? (1 point) nitrogen-fixing bacteria denitrifying bacteria decomposers producers 2. Which step in the nitrogen cycle is accelerated at the beginning of the ...
Monday, November 17, 2014 at 12:19pm
Science Help - Please
Can you please tell me if this is a balanced equation for Zinc and acetic acid... Zn(s) + 2CH3COOH(aq)-->Zn(aq)(CH3COO)2 + H2(g) I would appreciate any help
Monday, November 17, 2014 at 12:07pm
Science 8A Check Answers
Will someone please check my answers as I need lots of help in science. 1. Which of the following is an example of matter? A. leaves B. shadow C. light from the sun* D. sound 2. Which of the following is an example of a chemical property of matter? A. ability to melt B. ...
Monday, November 17, 2014 at 11:54am
In humans, the allele for brown eyes (B) is dominant to the allele for blue eyes (b). What is the probability that two heterozygous brown-eyed parents will have a child with blue eyes?
Monday, November 17, 2014 at 9:40am
Science help please
Which of the following statements describes the conservation of a natural resource? A. A timber company only cuts some trees down and replaces them with new trees. B. A solor energy company harvests energy from sunlight. C. A timber company cuts down all of the trees on a ...
Monday, November 17, 2014 at 12:04am
6th grade science
an example of homeostasis is A) maintaining a constant body temperature B) responding to stimuli C) keeping the same number of cells in an organisms D)all of the above I put A) and had the wrong answer. I put that answer since homeostasis is maintaining a constant internal ...
Sunday, November 16, 2014 at 9:29pm
Write neutralization reactions for each of the following acids and bases. HNO3(aq) and Ba(OH)2(aq) Express your answer as a balanced chemical equation. Identify all of the phases in your answer.
Sunday, November 16, 2014 at 8:39pm
The Venus flytrap is a plant that lives in wetland ecosystems that do not have nitrogen-rich soils. To make up for the lack of nitrogen in the soil, this species captures insects and digests them to obtain the nitrogen it needs. The ability of these plants to capture insects ...
Sunday, November 16, 2014 at 12:10pm
Write the half reactions and the balanced equation for the galvanic cell Hg(ℓ)| Hg2(+2)(aq)|| MnO(−4)(aq), Mn2 (aq), H(+)(aq)| Pt(s). What is the smallest possible integer coefﬁcient of Mn(2+)(aq) in the combined balanced equation?
Saturday, November 15, 2014 at 8:57pm
1. Which of the following can be expected to occur as climate change continues on Earth? decreased melting of sea ice decreased migration of pests and pathogens increased freshwater sources increased coastal flooding *** 2. Which piece of childrens playground ...
Friday, November 14, 2014 at 10:54pm
In what ways is Bohr's model of the atom similar to and different from Thomson's model? I still need someone to help me.. I dont know the similarities and differences..
Friday, November 14, 2014 at 10:11pm
Which of the following is true about the atom shown Choose two that apply. The picture shows one big red one in the middle with one blue ring on the outside that had 2 smaller red ones, and another blue ring outside of the first blue ring that had 8 smaller red ones. A. It is ...
Friday, November 14, 2014 at 9:21pm
science Help 911!!
You are creating a carbon cycle poster. Which object could you add to the image as another example of combustion of fossil fuels? A. the sun B.a buzzard eating a dead animal C.a person driving a car D.a scientists digging up fossils The picture shows a tree a bunny and fox ...
Friday, November 14, 2014 at 9:18pm
The arrows in the image show the direction in which carbon is moving. Which proces of the carbon cycle is indicated? The picture is of a wolf going after a bunny there is a building in the back with black smoke coming out of it and the arrows are point to the tree. A. ...
Friday, November 14, 2014 at 9:13pm
Lisa studied the models of three carbon nuclei shown below. She listed information about the carbon nuclei in a table. Name Carbon 12 number of protons 6 number of neutrons 6. Name Carbon 13 number of protons 6 number of neutrons 7. Name Carbon 14 number of protons 6 number of...
Friday, November 14, 2014 at 9:06pm
Which of the following demonstrates that reactants and profucts are chemically different? A. Zn+2HCI-->2HCI+Zn B. Zn+2HCI-->H2+ZnCI2 C. H2O+C4H10-->H2O+C4H1 D. C4H10+H2O-->C4H10+H2O Is the answer C?
Friday, November 14, 2014 at 8:56pm
A student made a list of reactions: Fireworks exploding Paper burning Cellular respiration How should the student title his or her list A. Double replacment reactions B. Single replacement reactions C. Endothermic reations D. Exothermic reations Is the answer C?
Friday, November 14, 2014 at 8:26pm