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October 20, 2014

Homework Help: Science

Branches of Science

Recent Science Questions

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

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
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

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
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 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

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
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
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
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

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
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

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

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

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:)
A polo player hits a ball with a mass of 0.42 kg with a force of 7.35 Newtons. How does the force the polo player's mallet exerted on the ball compare to the force the ball exerted on the mallet? A. The force of the mallet on the ball is equal in magnitude and opposite in ...
Friday, February 14, 2014 at 12:17pm

Physical Science
An Olympic sprinter can go from a state of rest to 11 meters per second in 10 seconds. What is the average acceleration of the sprinter?
Friday, February 14, 2014 at 11:35am

Science
How do you figure the average speed of something? What is the formula is what I really need. :)
Friday, February 14, 2014 at 11:14am

Science 8th Grade
What was the hiker's average velocity? Distance = 6km West Starting Time = 9:45 Ending Time = 10:45 A. 4.0 km/h south B. 0.10 km/h north C. 10 km/h south west D. 6 km/h west
Friday, February 14, 2014 at 11:08am

science
What is the main consideration when choosing an appropriate outlet box?
Thursday, February 13, 2014 at 9:30pm

physical science
19. (2 points) Ball 2, with a mass of 30kg, is moving to the left at 10m/s. With what velocity should Ball 1, with a mass of 10kg, move to the right and collide with Ball 2, so that Ball 1 rebounds with a velocity of 30m/s, and Ball 2 with a velocity of 10 m/s, after the ...
Thursday, February 13, 2014 at 8:33pm

Science
A plant deprives of light dies. Which of the following best explains why this happens? 1-The plant needs light to make it's food 2-Light allows the plant to make food for other organisms 3-Without light, the plant has no signals to be able to grow* 4-Plants need light to ...
Thursday, February 13, 2014 at 7:20pm

Science
Cycads, ginkgo, gnetophytes, and conifers are all gymnosperms. The plant shown is a ---
Thursday, February 13, 2014 at 5:31pm

Science
placental mammals develop what?
Thursday, February 13, 2014 at 4:35pm

Science Please HELP!!!
The sporophyte generation produces spores that grow into a(n)?
Thursday, February 13, 2014 at 4:31pm

science
I need help finding a PowerPoint with the importance of installation of actuator blocks on CH-47F aircraft or MH47 aircraft please.
Thursday, February 13, 2014 at 2:53pm

Science ( Need help really bad Please!)
An object's weight is dependent upon its location in the universe. Why is this true? A. This is true because weight is the magnitude of gravitational force acting on an object, and since gravitational force varies in different places in the universe, weight also varies. B...
Thursday, February 13, 2014 at 1:26pm

Physical Science
An Olympic sprinter can go from a state of rest to 11 meters per second in 10 seconds. What is the average acceleration of the sprinter?
Thursday, February 13, 2014 at 12:10pm

science
A lever scale is balanced with a partially filled glass of water on one side. Will the balance be upset (and if so how?) if you put your finger carefully into the water without touching the glass? What happens if the beaker is filled with air instead of water?
Thursday, February 13, 2014 at 10:37am

Science
how do you draw a bohr diagram of a atom and a ion and how are they different????
Wednesday, February 12, 2014 at 10:22pm

Science Mixture
Could you use the filtration method to separate a sugar water solution? Why or why not?
Wednesday, February 12, 2014 at 7:19pm

science
Which of the following was not considered to be strong evidence for the wave nature of light? refraction, diffraction, interference, or polarization.
Wednesday, February 12, 2014 at 1:30pm

science
14. Chemical runoff from fields, oil spills, and erosion is the major source of (1 point) a. air pollution b. water pollution c. hydropower d. renewable energy 15. Which compound causes the depletion of earth's ozone layer? (1 point) a. ultraviolet radiation b. ...
Wednesday, February 12, 2014 at 12:55pm

SCIENCE
AN INDEPENDENT LEARNER NEED TO BE A ___
Wednesday, February 12, 2014 at 3:20am

science- physics
when a wave strikes a boundary that is less dense than the original wave medium, the wave comes back a) upright b)inverted thank you!
Tuesday, February 11, 2014 at 9:25pm

Physics
In Larry Niven's science-fiction novel Ringworld, a rigid ring of material rotates about a star. The inhabitants of this ring world live on the starlit inner surface of the ring (where it is always noon). The tangential speed of the ring is 1.25x10^6 m/s, its radius is 1....
Tuesday, February 11, 2014 at 8:54pm

Science
Some gardening books tell people to water their plants during the morning or the evening instead of during the sunniest , hottest part of the day . Why do you think books say this
Tuesday, February 11, 2014 at 7:51pm

Science 7
Basidiomycota (Mushrooms and Toadstools) 28. Where do spores form & what are the spore-forming structures called?
Tuesday, February 11, 2014 at 6:16pm

Science 7
Zygomycota 12. Vertical hyphae produce what structures? 13. What is the function of these structures? Sexual Reproduction In Zygomycota 18. What type of benefit can there be for the new strain? 19. What are the two hyphae called that are involved in sexual reproduction? 20. ...
Tuesday, February 11, 2014 at 6:16pm

Science 7
Basidiomycota (Mushrooms and Toadstools) 28. Where do spores form & what are the spore-forming structures called?
Tuesday, February 11, 2014 at 5:49pm

Science 7
Zygomycota 12. Vertical hyphae produce what structures? 13. What is the function of these structures? Sexual Reproduction In Zygomycota 18. What type of benefit can there be for the new strain? 19. What are the two hyphae called that are involved in sexual reproduction? 20. ...
Tuesday, February 11, 2014 at 5:42pm

science
Which of the following is not among the advantages of generating nuclear energy? It does not release carbon dioxide into the atmosphere. It does not require a specialized process or involve any risk It does not release chemicals that cause acid rain It does not contribute to ...
Tuesday, February 11, 2014 at 5:27pm

Science
Is the following statement true or false? Solar panels collect energy from the sun that can then power a lamp in a home.
Tuesday, February 11, 2014 at 5:23pm

Science
Zygomycota; 12. Vertical hyphae produce what structures? 13. What is the function of these structures? Sexual Reproduction In Zygomycota; 16. Sexual reproduction is only possible in Rhizopus if what is true?
Tuesday, February 11, 2014 at 5:02pm

science
4.which of the following describes the use of a renewable form of energy? (1 point). 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
Tuesday, February 11, 2014 at 4:50pm

Science
Fungi 7. Why are fungi classified as heterotrophs like animals? 9. Explain how an absorptive hetertroph feeds?
Tuesday, February 11, 2014 at 4:26pm

Science! just one question! help ASAP plzzz
True or False: Plants continue to grow throughout their lives by producing new plant material. This sentence is __________ because…
Tuesday, February 11, 2014 at 4:17pm

Science~!
Harvesting energy from water, wind, and geothermal vents requires the use of (1 point) aquaculture engines mines turbines***
Tuesday, February 11, 2014 at 3:45pm

Science only one question...help plzz!
True or False: Plants continue to grow throughout their lives by producing new plant material. THANK YOU!
Tuesday, February 11, 2014 at 3:37pm

physical science
what is the velocity of ironman if he travels up 2,000 meters in 8.6 seconds
Tuesday, February 11, 2014 at 2:57pm

Science~!
Harvesting energy from water, wind, and geothermal vents requires the use of (1 point) aquaculture engines*** mines turbines Which of the following is not among the advantages of generating nuclear energy? (1 point) It does not release carbon dioxide into the atmosphere. It ...
Tuesday, February 11, 2014 at 1:28pm

physical science
Two force vector,a and b act on an object in the x direction and b acts on a y direction. Use words and diagram to explain how you can find the resultant force acting on the object by using the tail-to-head method
Tuesday, February 11, 2014 at 1:25pm

Science
Harvesting energy from water, wind, and geothermal vents requires the use of (1 point) aquaculture engines*** mines turbines Which of the following is not among the advantages of generating nuclear energy? (1 point) It does not release carbon dioxide into the atmosphere. It ...
Tuesday, February 11, 2014 at 12:58pm

Science
Which of the following describes how matter moves between producers, consumers, and decomposers in an ecosystem? one-way flow from producers to consumers to decomposers one-way flow from decomposers to consumers to producer cyclic flow froms producers to consumers to ...
Tuesday, February 11, 2014 at 12:43pm

Science-2questions
Which of the following describes how matter moves between producers, consumers, and decomposers in an ecosystem? one-way flow from producers to consumers to decomposers one-way flow from decomposers to consumers to producer cyclic flow froms producers to consumers to ...
Tuesday, February 11, 2014 at 10:31am

Science
Associate each item in the table with at least one field of science and one area of technology/engineering. Choose from the terms given at the bottom. Automobile aspirin shirt computer pesticide satellite robot atomic bomb vaccination can of soup polyester wrapper skyscraper ...
Tuesday, February 11, 2014 at 1:00am

science
What is the average speed of a satellite given the following information. 1) The earth's radius = 6000 km 2) The satellite is 900 km from the earth's surface 3) The satellite's orbital period: 2 hours 4) Circumference = 2pr (p = 3.14) A) 6 km/s B) 10 km/s C) 5 km/...
Monday, February 10, 2014 at 9:10pm

Science
Name 3 examples of fungus found in your house and where you found it or what you found it on.
Monday, February 10, 2014 at 6:09pm

science
Can scientists use radiocarbon dating to find the age of a very tall, old redwood tree living in an old growth forest? Explain your answer.
Monday, February 10, 2014 at 5:43pm

Science
Name 3 examples of fungus found in your house and where you found it or what you found it on.
Monday, February 10, 2014 at 5:24pm

science
Water Cycle:Evaporation (cause by sun) (sun gives off heat in light in order for H20 to evaporte) Condensation (form of coulds) Precipation (coulds get to hevay and relase all its water;sleet rain hail snow...other..)runoff (water thats seeps into the ground)ground water (...
Monday, February 10, 2014 at 4:33pm

Science
Pomology is the science of what? 1. wrinkles 2. oil mixtures 3. bean development 4. growing apples
Monday, February 10, 2014 at 2:40pm

Math, science, trinogonomentry
1, solve triangle ABC which have angleA= 250.251 angleB=600.511 and a=3.82 find c
Monday, February 10, 2014 at 1:15pm

Math, science, trinogonomentry
1, solve triangle ABC which have angleA= 250.251 angleB=600.511 and a=3.82 find c
Monday, February 10, 2014 at 1:11pm

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
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
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
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
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

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

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 --- 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.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
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

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