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April 19, 2014

Homework Help: Science

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Recent Science Questions

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science
I agree with DrBob222. It is B.
Monday, February 17, 2014 at 4:42pm

Physical Science
In what direction does heat flow? Why do particles of matter transfer thermal energy in this direction?
Monday, February 17, 2014 at 4:42pm

science
What are your choices?
Monday, February 17, 2014 at 4:41pm

science
How do two isotopes of the same element compare with each other? A.They have the same number of protons but a different number of electrons. B.They have the same mass number but a different number of protons. C.They have the same mass number but a different number of neutrons...
Monday, February 17, 2014 at 4:40pm

science
Sweetie, we do not know what blocks you are talking about. If you could post a picture, that would be great! :)
Monday, February 17, 2014 at 4:40pm

science
WHICH BLOCK WILL HAVE THE GREATEST CHANGE IN MOTION. A RED B BLUE C GREEN D YELLOW
Monday, February 17, 2014 at 4:39pm

science
LEAD
Monday, February 17, 2014 at 4:36pm

science
WHICH BLOCK WILL HAVE THE GREATEST CHANGE IN MOTION
Monday, February 17, 2014 at 4:34pm

Ethics
1. If we eliminate free will completely, we would also be eliminating: A. the possibility of genetic bases for human behavior. B. the value of modern science. C. moral responsibility. D. excuses for criminal conduct. is it C 2.
Monday, February 17, 2014 at 4:33pm

science
In the above procedure, m*a means mass* acceleration. MA = 20/1.2 = 16.67=Mechanical advantage MA = Fo/Fin = 16.67 Fo/300 = 16.67 Fo = 16.67 * 300 = 5,000 N. = Output. m*g = 5000 m * 9.8 = 5000 m = 510.2 kg. = Combined mass.
Monday, February 17, 2014 at 4:28pm

science
ROCK
Monday, February 17, 2014 at 4:26pm

science
B
Monday, February 17, 2014 at 4:25pm

science
A
Monday, February 17, 2014 at 4:24pm

science
??
Monday, February 17, 2014 at 4:23pm

science
I would go with D.
Monday, February 17, 2014 at 4:23pm

science
WHICH OBJECT WILL REQUIRE THE MOST FORCE TO TOSS IT 2 METERS
Monday, February 17, 2014 at 4:21pm

science
Which experiment would most directly reveal the inertia of an object? A.weighing a bottle on a digital scale B.moving a soda can back and forth to determine whether it is empty C.dropping a ball of paper and measuring how fast it falls D.throwing a ball to see how far it goes
Monday, February 17, 2014 at 4:14pm

science
For which surfaces will fricion be greatest when a block of wood slides across it
Monday, February 17, 2014 at 4:14pm

science
Which statement best describes the inertia of an object? A.Inertia is the tendency of an object to resist a change in its motion. B.Inertia is the weight of an object. C.Inertia is what determines how fast an object will fall. D.Inertia measures how hard an object will hit ...
Monday, February 17, 2014 at 4:14pm

Ethics
1. Modern-day determinism tends to be based in: A. religious teachings. B. science. C. the idea of predestination. D. intentionalism. is it B 2. Which of the following is theorized to play an important role in imitative behavior and our capacity to relate to and empathize with...
Monday, February 17, 2014 at 4:13pm

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
Monday, February 17, 2014 at 4:09pm

earth science
a
Monday, February 17, 2014 at 3:41pm

Life.science
In the moss, the sporophyte is sometimes referred to as a 'semi-parasite'. Explain why this is so.
Monday, February 17, 2014 at 3:34pm

phyical science
idk
Monday, February 17, 2014 at 2:56pm

Science
http://en.wikipedia.org/wiki/Magma
Monday, February 17, 2014 at 2:55pm

Science
Which statement best describes the composition of magma?
Monday, February 17, 2014 at 2:22pm

Physical Science
Nope, if you have other choices that might be more exact, like combustion, list them
Monday, February 17, 2014 at 12:51pm

Physical Science
Ty Again lol:)
Monday, February 17, 2014 at 12:44pm

Physical Science
well, oxidation (burning) of fuel is certainly a chemical operation.
Monday, February 17, 2014 at 12:41pm

Physical Science
What form of energy provides power for a gas stove? That's Chemical Energy, right?
Monday, February 17, 2014 at 12:34pm

Phsical Science
You are welcome :)
Monday, February 17, 2014 at 12:32pm

Phsical Science
thnk
Monday, February 17, 2014 at 12:32pm

Phsical Science
well, that is certainly potential energy and kinetic energy can be converted to potential so yes B
Monday, February 17, 2014 at 12:31pm

Phsical Science
Which one is the best explanation of energy? A. making transformations B. the ability to do work C. conservation of power D. measuring joules I think it is B.
Monday, February 17, 2014 at 12:29pm

Science
I agree.
Monday, February 17, 2014 at 12:27pm

Physical Science
I agree. It feels the temperature outside it but that is all really. The others all connect directly with the surroundings.
Monday, February 17, 2014 at 11:18am

Physical Science
You are welcome :)
Monday, February 17, 2014 at 11:12am

Physical Science
No system is completely closed off from its surroundings. Which represents a system that is almost completely closed? A. a capped soda bottle B. a wood-burning fireplace C. a washing machine D. a pot of boiling water I believe it is A.
Monday, February 17, 2014 at 11:09am

Physical Science
Cool thnx
Monday, February 17, 2014 at 11:08am

Physical Science
I think it is the toy train. The rest are prototypes, not models.
Monday, February 17, 2014 at 11:07am

Physical Science
I think it is C.
Monday, February 17, 2014 at 10:55am

Physical Science
Which has characteristics similar to a scientific model? A. a toy train B. a deep-sea submersible C. a planetary rover D. the Brooklyn Bridge
Monday, February 17, 2014 at 10:55am

Science
which of the following do rain forests and taiga have an common? A. similar average annual rainfalls. B. similar average annual temperature C. heavily populated with trees. D. tend to occur in similar latitudes
Monday, February 17, 2014 at 10:47am

Physical Science
If any valves were open, you could not compress the gas. 5 KG * specific heat of coal * 200 coal around 1.3 *10^3 J/kgK 5 * 1.3 *10^3 * 200 = 1,300,000 so a.
Monday, February 17, 2014 at 9:57am

Science
Which of the following describes how matter moves between producers, consumers, and decomposers in an ecosystem A) One-way flow from producers to consumers to decomposers B) One-way flow from decomposers to consumers to producers C) Cyclic flow from producers to consumers to ...
Monday, February 17, 2014 at 9:42am

Grammar Answer Check
1. Coordinating; subordinating; correlative. yes, yes, no 2. Correlative; correlative. yes, yes 3. Subordinating; coordinating. no, no 4. Subordinating. yes Combine these sentence pairs, using the tupe of conjunction specified. 1. I'm going to the bookstore. I need ...
Monday, February 17, 2014 at 7:57am

Science or math question
.
Monday, February 17, 2014 at 7:42am

science
5
Monday, February 17, 2014 at 12:37am

science
5
Monday, February 17, 2014 at 12:33am

science
25
Monday, February 17, 2014 at 12:09am

science
A Boy of mass 25 kg climbs atop a playground slide of height h= 3 m. When the boy slides down the inclined board, the work done to overcome friction is 550 Joule. What is the boy’s speed before he touches the ground.
Sunday, February 16, 2014 at 11:59pm

Physical Science
can I get some help with these questions. im not sure on these ones During the stage of internal combustion engine operation in which the piston rises and compresses the fuel in the combustion chamber, a. both the intake and exhaust valves are open b. the intake valve is open ...
Sunday, February 16, 2014 at 11:00pm

Science
When you have H2 gas in a tube and you test it, you usually ignite the H2 gas with a flame. The reaction is 2H2 + O2 ==> 2H2O. I expect that you SEE no H2O because the combustion gives a gas (steam) and you don't see that. But it's there. Perhaps if you cooled the ...
Sunday, February 16, 2014 at 10:27pm

physical science
Wt. = 80kg * 1.625N/kg = 130.7 N. g on moon = 1.625 m/s^2.
Sunday, February 16, 2014 at 9:55pm

GEN 499 General Education
These are the automatically computed results of your exam. Grades for essay questions, and comments from your instructor, are in the "Details" section below. Date Taken: 2/16/2014 Time Spent: 27 min , 35 secs Points Received: 24 / 25 (96%) Question Type: # Of ...
Sunday, February 16, 2014 at 9:29pm

science
Wrong... MA of inclined plane = 20m/1.2m = 16.67 &the rest idk.
Sunday, February 16, 2014 at 9:26pm

Science
I think the last question means if we test hydrogen in a tube, y is there no water in it? I don't know wut the question means either and thank u for ur help:)
Sunday, February 16, 2014 at 8:40pm

science
sin A = 1.2m/20m = 0.06 A = 3.44o Fap-Fp = m*a = m*0 = 0 300 - Fp = 0 Fp = 300 N = Force parallel to the ramp. Fp = mg*sin A = 300 N. m * 9.8*sin3.44 = 300 0.588m = 300 m = 510.2 kg. = Combined mass.
Sunday, February 16, 2014 at 8:38pm

Science
Yes, elements can be separated from compounds. It takes a reaction of some kind; i.e., they can not be separated by physical means. The gas, H2, is lighter than air; therefore, holding the tube upright with no stopper and the gas will float out. Holding the tube upside down, ...
Sunday, February 16, 2014 at 8:35pm

Science
Can an element be separated from a compound? Can an element form a compound? The reaction of zinc metal and hydrochloric acid creates hydrogen gas, an element. if we create this element in a tube what property of this element requires us to keep the tube upside down? Water has...
Sunday, February 16, 2014 at 7:19pm

Grammar Answer Check
Identify the underlinded conjunctions in the following excerpts from "The Interlp[ers" as "coordinating," "correlative," or "subordinating." 1. ..a man stood one winter night watching _and_ listening, _as though_ he waited for some beast...
Sunday, February 16, 2014 at 7:16pm

science - Damon?
Yeah, you may be right. It could be that the hydraulics involve prove that the weight of air in the beaker remains constant regardless of how much is displaced, but I'd have to research it. I guess you can do that on your own, or hope Damon or someone will stop by with ...
Sunday, February 16, 2014 at 5:48pm

science
I don't think it is correct but i am myself not sure what is the right answer.
Sunday, February 16, 2014 at 5:09pm

science
DrBob has confidence that the students who use this board are intelligent and capable of finding the answers with a little help. Giving students straight-out answers does not help them learn.
Sunday, February 16, 2014 at 4:38pm

science
since you displace some of the air in the beaker, its side of the lever should rise.
Sunday, February 16, 2014 at 4:32pm

science
I just felt like posting to say that DrBob is one of the least useful answerers on this site...he never actually gives the answer
Sunday, February 16, 2014 at 4:23pm

science
A lever scale is balanced with a beaker filled of air on one side. The scale is very sensitive and can easily measure a change in weight of about 1/2 mg. What happens If you put your finger carefully into the beaker without touching the glass?
Sunday, February 16, 2014 at 3:46pm

science
density = mass/volume Just make up some numbers and see. For example suppose A = 20g and B = 10 g for mass. Then they both have the same volume of 5 cc. Substitute those numbers and see which has the higher density.
Sunday, February 16, 2014 at 3:41pm

science
if you have two samples of the same volume. the mass of sample A is higher than that of sample B. which sample has the greatest density?
Sunday, February 16, 2014 at 3:08pm

physical science
F = m g = G M m/R^2 10 * R ---> 1/100 90 * m ----> 90 9.81 * 90/100 = 8.83 m/s^2
Sunday, February 16, 2014 at 2:39pm

Science
These questions refer to tides. 1. Why are vertical clearances of bridges along navigable waterways given as heights in feet above mean(average) water height? 2. Why would knowledge of tides be of any importance in a military landing action?
Sunday, February 16, 2014 at 2:23pm

physical science
the diameter of the planet saturn is 10 times that of the earth but the mass of the planet is only 90 times greater than that of the earth.what is the gravitational acceleration or number gs you will feel on saturn?(8.8m.s-2)
Sunday, February 16, 2014 at 12:27pm

physical science
calculate the weight of a man with a mass of 80.0kg on the surface of the moon 156N?
Sunday, February 16, 2014 at 12:18pm

Science
Classify reaction as addition, displacement, or decomposition: Al(s)+NaOH(aq)=Al(OH)3(s)+Na+(aq)
Sunday, February 16, 2014 at 11:46am

Physical science
Well, 0 Newtons gives 0 frictional force
Sunday, February 16, 2014 at 11:27am

Physical science
A box a weight of 100 N rests on a horizontal floor.The coefficient of static friction is 0,40 and the coefficient of kinetic friction is 0,30.DETERMISE THE FRICTIONAL FORCE ACTING ON THE BOX IF A HORIZONTAL FORCE IS APPLIED WITH A MAGNITUDE OF 0 N
Sunday, February 16, 2014 at 10:53am

science
A ramp 20m long slopes down 1.2m to the edge of a lake. A force of 300N is needed to pull a boat on a trailer at constant speed up the ramp when they are clear of the water. If friction is negligible, what is the combined mass of the boat and trailer. Hints: Calculate MA of ...
Sunday, February 16, 2014 at 10:04am

Science
HIV is a retrovirus. Which of the following processes does it use to synthesize a DNA strand using its own RNA genome as a template? *reverse translation *reverse transcription-------- *translation *transcription
Sunday, February 16, 2014 at 9:17am

Science
These questions refer to tides. 1. Why are vertical clearances of bridges along navigable waterways given as heights in feet above mean(average) water height? 2. Why would knowledge of tides be of any importance in a military landing action?
Saturday, February 15, 2014 at 11:33pm

BIO. LIFE SCIENCE
The genotypes of the parents must be Pp and pp, such that half the progeny have the dominant allele (P_) and half have the recessive phenotype (pp).
Saturday, February 15, 2014 at 3:41pm

8th grade science
Can someone please help me. I've been looking online on the internet but I still cant find the answers and I have read the whole chapter in my book based on what we are learning and I cannot find any useful information that will help me answer this question. So Please help...
Saturday, February 15, 2014 at 3:24pm

8th grade science
Explain how the sun's temperature will change over time as it ages.
Saturday, February 15, 2014 at 3:17pm

Life science, physical science, business studies, pure maths
i am doing these subject at school, wat can i become!
Saturday, February 15, 2014 at 10:17am

physical science
Vi up = 10 sin 60 = 8.66 m/s if ax is horizontal acceleration, there is none. Horizontal component of velocity is constant
Saturday, February 15, 2014 at 10:16am

science
Hello Damon i have asked my teacher and he said that the air part is not what you said. He gave me one more chance to tell him what is the right answer.
Saturday, February 15, 2014 at 10:15am

physical science
been there, scroll down
Saturday, February 15, 2014 at 10:14am

physical science
Vi up = 10 sin 60 = 8.66 m/s if ax is horizontal acceleration, there is none. Horizontal component of velocity is constant
Saturday, February 15, 2014 at 10:14am

physical science
A frog jumps at the angle of 60 degrees to horizontal with initial velocity of 10.0m/s 1. calculate velocity Voy of the frog 2 calculate acceleration ax of the frog
Saturday, February 15, 2014 at 9:56am

physical science
A frog jumps at the angle of 60% to horizontal with initial velocity of 10.0m/s 1. calculate velocity Voy of the frog 2 calculate acceleration ax of the frog
Saturday, February 15, 2014 at 9:56am

physics
As a science project, you drop a watermelon off the top of the Empire State Building, 320 m above the sidewalk. It so happens that Superman flies by at the instant you release the watermelon. Superman is headed straight down with a speed of 37.0m/s .
Saturday, February 15, 2014 at 12:12am

Science
I believe the answer is c but I think most modern CRTs use deflection by magnetic coils. Some electrostatic devices are also used and this may be where the word "plate" comes from.
Friday, February 14, 2014 at 11:14pm

Science
in a cathode ray tube, the number of electrons that reach the florescent screen is controlled by the A. anode b. cathode. c. deflecting plate d. grid
Friday, February 14, 2014 at 9:20pm

Math
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 (got 4 students)
Friday, February 14, 2014 at 6:46pm

Physical Science Need Help Quick PLEASE:)
Ok Cool THANK YOU all
Friday, February 14, 2014 at 5:09pm

Physical Science
a = change in velocity/change in time = (11 - 0) / 10 = 1.1 m/s^2
Friday, February 14, 2014 at 12:43pm

Physical Science Need Help Quick PLEASE:)
Al;so go back and find I added to answers to your earlier questions
Friday, February 14, 2014 at 12:42pm

Physical Science Need Help Quick PLEASE:)
Newton - THIRD LAW use Google !!!!!
Friday, February 14, 2014 at 12:41pm

Science
divide the total distance by the total time. That gives the average SPEED. If you divide the total DISPLACEMENT (which includes the effect of the directions of the VELOCITY vectors) by the total time you get the average VELOCITY for example walk one mile north at 1 mile/hr ...
Friday, February 14, 2014 at 12:34pm

science
5
Friday, February 14, 2014 at 12:33pm

Science 8th Grade
divide the total distance by the total time. That gives the average SPEED. If you divide the total DISPLACEMENT (which includes the effect of the directions of the VELOCITY vectors) by the total time you get the average VELOCITY for example walk one mile north at 1 mile/hr ...
Friday, February 14, 2014 at 12:30pm

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