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August 2, 2014

Homework Help: Science

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Recent Science Questions

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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

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

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
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

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

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

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
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

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
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
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

science
_______ magma causes powerful and explosive volcanic eruptions. A. Composite B. Rhyolitic C. Andesitic D. Basaltic im tottally lost
Wednesday, February 5, 2014 at 9:41pm

science
The active sections that are located along fault lines are called A. seismic risks. B. recurrence gaps. C. seismic gaps. D. stress accumulations. i think it might be c
Wednesday, February 5, 2014 at 9:33pm

science
Which statement about supercell storms is false? A. A supercell storm can develop into a self-sustaining, extremely powerful storm. B. A supercell storm is characterized by rotating updrafts. C. A supercell storm occurs only during the winter months. D. A supercell storm can ...
Wednesday, February 5, 2014 at 8:51pm

Science
5. The process of desertification can occur when (1 point) 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 (desertification is the ...
Wednesday, February 5, 2014 at 8:06pm

Science,
5. The process of desertification can occur when (1 point) 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
Wednesday, February 5, 2014 at 7:24pm

Science
What is indicate by the color of the stars? List and label them.
Wednesday, February 5, 2014 at 6:35pm

science
6 FeCl2(aq) + K2Cr2O7(aq) + 14 HCl(aq) ==> 6 FeCl3(aq) + 2 CrCl3(aq) + 2 KCl(aq) + 7 H2O(l) How many milliliters of 0.0750 M K2Cr2O7(aq) will react with 0.038 mol of FeCl2(aq)? I used the equation Molarity=Mole/Volume and divided my answer by 1000 to get milliliters. I'...
Wednesday, February 5, 2014 at 5:54pm

Integrated Science
What is he final temperature after 80.0 calories is absorbed by 10.0 grams of water at 25.0 *C?
Wednesday, February 5, 2014 at 5:34pm

Science
Archimedes' principle states that the buoyant force on an object is equal to the density of the fluid it displaces. true?
Wednesday, February 5, 2014 at 5:17pm

Science
Density is given in ____. a.Pa/cm3 b.N/m2 c.g/s2 d.g/cm3 I cant rremember, c?
Wednesday, February 5, 2014 at 5:06pm

science
an astronaut has a mass of 100 kg. she recedes from her spacecraft using spurts of gas from a small unit on her back. if the force generated by the gas spurt is 50N, calculate her acceleration?
Wednesday, February 5, 2014 at 4:15pm

social science
Think about the war between the United States and Iraq. To what degree, if any, did political culture play a role in the decision to go to war, the public’s support of the war, and how public officials discussed the war? Looking at this example, reflect back on historical...
Wednesday, February 5, 2014 at 4:11pm

Science
A 100 kg sample of a metal is cooled from 100°C to 20°C by removing 20 kcal of heat. Calculate the specific heat capacity of the metal.
Wednesday, February 5, 2014 at 3:25pm

science
a stone is dropped down a well.it hits th surface of the water after 2seconds.find the depth of water from point where the stone was dropped
Wednesday, February 5, 2014 at 2:09pm

Science
5.The process of desertification can occur when B.farmers use contour farming techniques C.an area of forest is clear-cut D.an area of forest is selectively cut 7.Which of the following statements describes the conservation of a natural resource? A.A factory burns coal to run ...
Wednesday, February 5, 2014 at 1:45pm

science
production. Describe at least two alternatives to oil that are currently available and discuss the barriers that keep these alternatives from replacing oil as our primary means of energy? Additionally, utilizing at least two scholarly or reputable resources and your textbook, ...
Wednesday, February 5, 2014 at 1:00pm

science(CHECK ANSWERS)
which of the following is the best example of transforming electromagnetic energy into thermal energy? A.when trees absorb sunlight for photosynthesis. B.when the interior of a car absorbs sunlight and warms up.(I PICK THIS) C.when a solar panel absorbs sunlight to make ...
Wednesday, February 5, 2014 at 11:56am

Science (please check my answers)
7. During the process of photosynthesis, plants convert carbon dioxide and water into glucose. Covalent bonds hold the glucose molecules together. The breaking of the covalent bonds during digestion releases energy. The type of energy released is (1 point) • kinetic ...
Wednesday, February 5, 2014 at 11:38am

science(CHECK ANSWERS)
which of the following is the best example of transforming electromagnetic energy into thermal energy? A.when trees absorb sunlight for photosynthesis. B.when the interior of a car absorbs sunlight and warms up. C.when a solar panel absorbs sunlight to make electricity (I PICK...
Wednesday, February 5, 2014 at 12:49am

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