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April 20, 2014

Homework Help: Science

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Recent Science Questions

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Science, plz,plz help
Which of the following illustrates the energy changes taking place during photosynthesis? light energy from sun ¨ chemical energy in bonds of glucose chemical energy in bonds of glucose ¨ light energy from sun light energy from sun ¨ chemical ...
Monday, February 10, 2014 at 11:46am

science
an influx of soil nutrients results in increased grass growth.
Monday, February 10, 2014 at 9:52am

Science
A force of 650N is acting upwards and a force of 850N is acting downwards along the same line,state the magnitude and direction of the resultant force and the equilibrant force
Monday, February 10, 2014 at 9:23am

science
the height of the person
Monday, February 10, 2014 at 5:03am

science
what is the minimum vertical length of a plane mirror needed for a person to be able to see a complete hesd to toe image?
Monday, February 10, 2014 at 4:05am

phyical science
A 250 g yo-yo is swung on the end of a 50 cm string at a constant speed of 4 m/s. The centripetal force acting on the yo-yo is
Sunday, February 9, 2014 at 8:51pm

Science
I suppose one should ask WHICH experiment by Lavoisier but I agree with your answer.
Sunday, February 9, 2014 at 7:12pm

Science
Yes.
Sunday, February 9, 2014 at 6:59pm

Science
what has a definite shape and volume a- solid b- liquid c- gas d- molecule My answer is A
Sunday, February 9, 2014 at 6:58pm

science
Which type of mechanical energy do the following contain? Kinetic Energy, Potential Energy, or Both A Car traveling at 100 mph along a flat road - KE A rubber band that has been stretched - PE A bowling ball rolling down a lane - both A piano lifted to a second story window - ...
Sunday, February 9, 2014 at 6:54pm

Science
What did Antoine Lavoisier’s experiments demonstrate? a- Atoms always split into pairs during a chemical change. b- Mass is neither lost nor gained during a chemical change. c- Matter can be created during a chemical change. d- Energy is neither lost nor gained during a ...
Sunday, February 9, 2014 at 6:47pm

Science
d is the only chemical reaction implied so I agree with you.
Sunday, February 9, 2014 at 6:32pm

Science
which is a chemical property of aluminum a- melting point is 660c b- boiling point is 2519c c- does not dissolve in water d- reacts with oxygen My answer is D
Sunday, February 9, 2014 at 6:23pm

physical science
Mass is the same no matter where. Weight is greatest on planet with largest G and smallest on planet with smallest G.
Sunday, February 9, 2014 at 6:23pm

Science
See your post above.
Sunday, February 9, 2014 at 6:18pm

Science
For NaOH, this is 100% dissociated; therefore, (OH^-) = (NaOH) OH^- = 2 M pOH = -log(OH^-) pH + pOH = pKw = 14. You know pOH, solve for pH. The H2SO4 isn't as simple as it lookis. If you are an advanced student, (0.39+x)/(0.39-x) = k2 for H2SO4. Solve for x and evaluate 0....
Sunday, February 9, 2014 at 6:18pm

Science
I agree.
Sunday, February 9, 2014 at 6:07pm

Science
what would happen to an object if the force of gravity on earth was decreased by half. a- its mass would decrease b- its weight would decrease c- its density would decrease d- its volume would decrease my answer is B
Sunday, February 9, 2014 at 6:04pm

Science
Calculate the PH of and POH of the following solution and comment on them.(a)0.39 moldm3 of H2SO4(b)2.0 moldm3 of NaoH
Sunday, February 9, 2014 at 5:49pm

Science
Calculate the PH of and POH of the following solution and comment on them.(a)0.39 moldm3 of H2SO4(b)2.0 moldm3 of NaoH
Sunday, February 9, 2014 at 5:48pm

physical science
A horizontal force of 100 N is required to push a box across the floor at a constant velocity. a) Show that the net force acting on the box is zero. b) Show that the friction force that acts on the box is 100 N.
Sunday, February 9, 2014 at 5:21pm

physical science
Consider a 100-kg box of tools in location: A: on Earth B: on the Moon C: on Jupiter. Rank from greatest to the least the a) masses of the 100 kg box of tools and b) the weights of the 100-kg box of tools.
Sunday, February 9, 2014 at 5:20pm

physical science
If you know that a 1-kg object weighs 10N, confirm that the acceleration of a 1-kg stone in free fall is 10 m/s2.
Sunday, February 9, 2014 at 5:16pm

science/physics
If a pendulum is not pushed, why does it not go as big when it swings back. Where does the lost PE go? ans. Since there is no force applied to the pendulum there is not enough Kinetic energy (energy of motion) to transform into potential energy to make it swing back. The ...
Sunday, February 9, 2014 at 1:19pm

physics/science
If a pendulum is not pushed, why does it not go as big when it swings back. Where does the lost PE go? ans. Since there is no force applied to the pendulum there is not enough Kinetic energy (energy of motion) to transform into potential energy to make it swing back. The ...
Sunday, February 9, 2014 at 10:41am

science
BC: d = rate x time 40,000 = 2500*t t = 8 hours for the first half. 40,000 = 1000*t t = 20 hours for the second half. Total time = 28 hours. There are ways to go here. The first is to see if half the time (14 hours) at the FC speeds will come up more or less than 40,000. d = ...
Saturday, February 8, 2014 at 9:07pm

science
A British Concorde (BC) and a French Concorde (FC) flew in opposite directions around the earth (40 000 km). The BC covered half of its flight distance at a supersonic speed of 2500 km/h and the other half at a subsonic speed of 1000 km/h. The FC spent half of its flight time ...
Saturday, February 8, 2014 at 7:13pm

Science
I agree.
Saturday, February 8, 2014 at 6:45pm

Science
Which of the following would result in the greatest reduction of waste sent to a landfill? a- composting food waste b- recycling glass, plastics, and metals c- reusing rubber, leather, and textiles from new products d- planting more trees in forests my answer is B
Saturday, February 8, 2014 at 6:37pm

Science
Yes. The issue here is pollution.
Saturday, February 8, 2014 at 6:24pm

Science
yeah
Saturday, February 8, 2014 at 6:19pm

Science
OK I 1st thought pollution but then I felt that the spills caused harm that impacted the biodiversity so is pollution correct?
Saturday, February 8, 2014 at 6:16pm

Science
Nope.
Saturday, February 8, 2014 at 6:14pm

Science
Oil spills and leaks in the Pacific Ocean have harmed marine organisims and the environment. Which kind of environmental issue is illustrated by this example? a- resource use b- pollution c- population growth d- biodiversity My answer is D
Saturday, February 8, 2014 at 6:10pm

Science
F.
Saturday, February 8, 2014 at 5:53pm

Computer Science
Write a program that allows the user to input a total dollar amount for an online shopping order and computes and outputs the shipping cost based on the following schedule: Order Total Ship within USA Ship to Canada Less than $50.00 $6.00 $8.00 $50.01–$100.00 $9.00 $12.00...
Saturday, February 8, 2014 at 5:27pm

Science
In a perfect world I suppose I agree with you. Although it isn't part of the problem, remember that preservation means from all influences, not just those by man.
Saturday, February 8, 2014 at 4:51pm

Science
Does the preservation of biodiversity prevent the extinction of species? My answer is yes
Saturday, February 8, 2014 at 4:30pm

Science
Right.
Saturday, February 8, 2014 at 4:29pm

Science
I agree.
Saturday, February 8, 2014 at 4:29pm

Science
Why is biodiversity ecologically valuable? a- it provides humans with food and shelter b- it is reliable source of revenue c- it establishes the foundation for food chains and food webs d- it provides raw materials fore clothing and medicine my answer is C
Saturday, February 8, 2014 at 4:16pm

Science
Why are rain forests the most diverse ecosystems? a- the are near bodies of water b- they have favorable climates c- they are surrounded by mountains d- they have more pollutants then other ecosystems my answer is B
Saturday, February 8, 2014 at 4:13pm

10th grade Science
Explain how a drug sits on acetylcholine receptors will affect muscle function? Is it because the drug would act as a blocking agent to prevent the receptors from gathering information on what to do?
Saturday, February 8, 2014 at 1:27pm

science (Partial)
2. gas, solid, liquid 3. It seeks the lowest level. 5. The water particles move so fast that they escape the liquid and become a gas. Foreign particles are deposited out.
Saturday, February 8, 2014 at 1:14pm

science --- pls check my work!!!
Liquids with high viscosity do not flow as well as liquids with low viscosity. honey - high viscosity water - low viscosity
Saturday, February 8, 2014 at 12:29pm

science --- pls check my work!!!
hi, pls check my work asap! 1. A ___ has a definite shape and a definite volume. (1 point) solid*** liquid gas molecule 2. Why is a gas able to flow? (1 point) Its particles have melted and can move around.Its particles have high viscosity and can move around. Its particles ...
Saturday, February 8, 2014 at 12:23pm

science
1. goes for a walk 2. doesn't go 3. remember his umbrella 4. forgets his umbrella So, 2nd.
Saturday, February 8, 2014 at 8:29am

science
1.What two things happen to particles in a substance when the substance is heated? 2. What are the three most common states of matter on Earth? 3. Why does a liquid take the shape of whatever container it is in but does not expand to fill the container completely? 4. A certain...
Saturday, February 8, 2014 at 2:00am

Science
Ratio = 200/20 = 10/1. 10 Loops on Primary and 1 loop on Secondary. p
Friday, February 7, 2014 at 9:21pm

Science
Oh okay, thank you. It doesn't really talk about this in my book.
Friday, February 7, 2014 at 7:31pm

Science
C. Nephron, villi, alveoli Capillaries in these structures allow the easy transfer of molecules to these tissues.
Friday, February 7, 2014 at 5:44pm

science
d = 0.5g*t^2 = 4.9*2^2 = 19.6 m.
Friday, February 7, 2014 at 3:33pm

Science
2 is right. For 1, use the same f = ma you did in #2.
Friday, February 7, 2014 at 2:23pm

Science
Help, I am not sure I am doing this right. Are these correct? 1. What is the acceleration of a 1,500-kg elevator with a net force of 10,500 N? 2. What net force is needed to accelerate a 60-kg cart at 12 m/s 2? I think it is 720N
Friday, February 7, 2014 at 2:18pm

probability science
7/8
Friday, February 7, 2014 at 1:21pm

physical science
I don't like it.
Friday, February 7, 2014 at 12:36pm

physical science
what do you think about the kind of charge on the plastic straw
Friday, February 7, 2014 at 12:17pm

science(please check answers)
im hoping this is right
Friday, February 7, 2014 at 12:12pm

science
I would say kinetic energy.
Friday, February 7, 2014 at 1:28am

science
I would say kinetic energy.
Friday, February 7, 2014 at 1:28am

Science
1 is C. 2 I don't know, 3 I don't understand the choices, 4 is A.
Thursday, February 6, 2014 at 10:53pm

Chemistry
It says 8. In a similar experiment Mary Moreorlesss was to determine the loss of weight when a crucible of potassium chlorate was heated to drive off the oxygen. After finishing the experiment she concluded the potassium chlorate contained 24.0% oxygen. Why did miraculous(...
Thursday, February 6, 2014 at 10:25pm

science
How can atoms of two elements that have a different number of protons have the same charge? A. by also having a different number of neutrons B. by also having a different number of electrons C. by having the same mass number D. by being the same size atoms
Thursday, February 6, 2014 at 9:10pm

science
If we drilled a hole straight through the earth, and dropped a golf ball down the hole, starting initially at rest, how fast would the ball be traveling when it reached the center of the earth. The earth’s radius is 6378 km.
Thursday, February 6, 2014 at 8:28pm

science
a b d c a b d c c a c a a
Thursday, February 6, 2014 at 8:06pm

Science
ATSETLECTOICNP
Thursday, February 6, 2014 at 7:51pm

Science
Which of the following are structures that rely on capillaries for exchange or movement of small molecules? A. Teeth, aorta, ureter. B. Cartilage, epidermis, larynx. C. Nephron, villi, alveoli. D. Leukocytes, atrium, bronchi. Can you check this please, it doesn't really ...
Thursday, February 6, 2014 at 7:40pm

Science
Alternating current going into a transformer has 200 volts. The current coming out has 20 volts. How many loops of wire might each coil have?
Thursday, February 6, 2014 at 7:38pm

reading
I tried searching this book to find out how Carson defended her view that scientists can rarely be writers. I found nothing. Sorry. However, there have been many scientists who have also been writers. Rachel Carson is one. Check this site for others. http://www.onlinecollege....
Thursday, February 6, 2014 at 7:28pm

Science
Which of the following sets of words can be used to describe the outputs of photosynthesis? water, glucose, light energy carbon dioxide, glucose, chemical energy oxygen, glucose, chemical energy glucose, oxygen, light energy Which of the following is true about producers? They...
Thursday, February 6, 2014 at 7:01pm

Science
Lightbulb sizes
Thursday, February 6, 2014 at 6:54pm

Science asap thankies :)
You are welcome!
Thursday, February 6, 2014 at 6:23pm

Science Work
Sorry for repeating...
Thursday, February 6, 2014 at 5:55pm

Science Work
1. C 2. C 3. A 4. D 5. A 6. A 7. D 8. C 9. C 10. D Submit these answers for this quiz and let me know how you did! :D
Thursday, February 6, 2014 at 5:54pm

Science Work
1. C 2. C 3. A 4. D 5. A 6. A 7. D 8. C 9. C 10. D Submit these answers for this quiz and let me know how you did! :D
Thursday, February 6, 2014 at 5:53pm

Science asap thankies :)
thankies mathguru!! :)
Thursday, February 6, 2014 at 5:29pm

Science asap thankies :)
Object will sink if buoyant force is less than the weight of the object. Object will move up if buoyant force is greater than the weight of the object. Object will float or stay constant if both equal.
Thursday, February 6, 2014 at 5:26pm

asap science
Thankies Bob!!
Thursday, February 6, 2014 at 5:20pm

asap science
Buoyancy pushes an object upward.
Thursday, February 6, 2014 at 5:16pm

asap science
what direction does buoyancy act in? all directions, up? etc.
Thursday, February 6, 2014 at 5:08pm

Science asap thankies :)
If an object sinks in a fluid, the buoyant force is ____ the weight of the object.
Thursday, February 6, 2014 at 5:03pm

Science
Newton #3 equal (in magnitude) and opposite (in direction)
Thursday, February 6, 2014 at 3:08pm

math***CHECK ANSWER***
please check this one answer. 3.everyone in andy's class has to do a science project. Out of the 20 students,80% have completed their project.how many students still need to finish their projects? A.100 students B. 36 students C. 16 students D. 4 students (I PICK THIS)
Thursday, February 6, 2014 at 3:02pm

Science
The action and reaction forces in any situation will always be ----- and ----.
Thursday, February 6, 2014 at 2:34pm

math***check answerss****
please check answers... 2.yesterday ,a parking lot had 10 cars parked in it.of the cars parked in the parking lot l,40% were silver,3 were red,and the rest were blue.how many of the cars were blue? A.2 cars B. 5 cars C. 3 cars (I PICK THIS) D. 8 cars 3.everyone in andy's ...
Thursday, February 6, 2014 at 2:20pm

math***CHECK ANSWERS***
PLEASE CHECK MY ANSWERS! THANKS please help me and thanks to you all !! 1. A car travels 132 miles using 4 gallons of gas.At that rate,how far can the car travel using 7 gallons of gas? A.231 miles (I pick this) B.264 miles C.134 miles D.1,260 miles 2.yesterday ,a parking lot ...
Thursday, February 6, 2014 at 1:47pm

science
sorry i do not know why it posted that so many times :/ lol :)
Thursday, February 6, 2014 at 1:41pm

science
The answer is most definitely D. Take it from an A+ science student.
Thursday, February 6, 2014 at 1:40pm

science
The answer is most definitely D. Take it from an A+ science student.
Thursday, February 6, 2014 at 1:40pm

science
The answer is most definitely D. Take it from an A+ science student.
Thursday, February 6, 2014 at 1:40pm

science
Mary and Tom park their cars in an empty parking lot with n >_ 2 consecutive parking spaces (i.e, spaces in a row, where only one car fits in each space). Mary and Tom pick parking spaces at random. (All pairs of parking spaces are equally likely.) What is the probability ...
Thursday, February 6, 2014 at 1:37pm

science
would it be temperature or kinetic energy
Thursday, February 6, 2014 at 1:31pm

math
ANSWER THESE NOW PLEASE !!!!!!! 2.yesterday ,a parking lot had 10 cars parked in it.of the cars parked in the parking lot l,40% were silver,3 were red,and the rest were blue.how many of the cars were blue? A.2 cars B. 5 cars C. 3 cars D. 8 cars 3.everyone in andy's class ...
Thursday, February 6, 2014 at 1:30pm

science- Woefully incomplete
Huh???
Thursday, February 6, 2014 at 1:20pm

science
no diagram
Thursday, February 6, 2014 at 1:18pm

science
Let , , and be disjoint subsets of the sample space. For each one of the following statements, determine whether it is true or false. Note: "False" means "not guaranteed to be true." a) True FalseStatus: unsubmitted b) True FalseStatus: unsubmitted c) True...
Thursday, February 6, 2014 at 1:14pm

science
We do not do your homework for you. Although it might take more effort to do the work on your own, you will profit more from your effort. We will be happy to evaluate your work though. biofuel for vehicles, wind or solar energy for homes Also, we do not have access to your ...
Thursday, February 6, 2014 at 1:13pm

science
Paul checks the weather forecast. If the forecast is good, Paul will go out for a walk. If the forecast is bad, then Paul will either stay home or go out. If he goes out, he might either remember or forget his umbrella. In the tree diagram below, identify the leaf that ...
Thursday, February 6, 2014 at 1:13pm

probability science
Consider the same model of two rolls of a tetrahedral die, with all 16 outcomes equally likely. Find the probability of the following events: a) The value in the first roll is strictly larger than the value in the second roll.
Thursday, February 6, 2014 at 1:10pm

earth space science
5 billion
Thursday, February 6, 2014 at 9:29am

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