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December 20, 2014

Homework Help: Science

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Recent Science Questions

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Science plz?
Identify the process that is necessary for sexual reproduction, explain why it is necessary, and identify how this process increases genetic variation.
Monday, November 10, 2014 at 5:50pm

Science
What is the importance of enzymes
Monday, November 10, 2014 at 5:50pm

Science
List these from broadest to specific Organism Ecosystem Population Community Where would ecosystem fall Population, community, organism
Monday, November 10, 2014 at 5:31pm

Science
Climate change studies suggest the worst impacts will be felt by the wealthiest people.
Monday, November 10, 2014 at 4:56pm

Science
What is the central theme of the “As Cheap as Coal” portion in Section 8.1 of your text?
Monday, November 10, 2014 at 4:55pm

Science
Which statement is true regarding nuclear energy?
Monday, November 10, 2014 at 4:49pm

Science
If You Heated 100 Grams Of Powdered Mercuric Oxide To Produce 93 Grams Of Liquid Mercury How Much Oxygen Would Be Released
Monday, November 10, 2014 at 2:29pm

Science
Why does Potassium Nitrate crystallise when cooled and saturated?
Monday, November 10, 2014 at 12:38pm

Physical Science
You supply 400 kilocalories of heat energy to a block of ice, with a mass of 14 kg. What will be the outcome?
Monday, November 10, 2014 at 7:56am

Physical Science
The sun's energy melts part of a glacier of ice at 0 degrees Celsius. The sun supplies 880 kilocalories to a big glacier of ice at 0 degrees Celsius. How many kilograms of ice will melt into liquid water at 0 degrees Celsius?
Monday, November 10, 2014 at 7:54am

Science
a cyclist accelerates from rest to 8 m/s in 3 seconds. what in his acceleration? is this acceleration higher than that of a car which accelarates from 0 to 40 m/s in 8 seconds? WO
Monday, November 10, 2014 at 7:27am

Science
In addition to Carbon and Hydrogen, which elements must be available to form a DNA nucleotide monomer?
Sunday, November 9, 2014 at 5:05pm

Engineering science
a roller of diameter 1.5 m has a mass of 450 kg; it is pulled by a handle attached to its centre. Find the minimum force to pull up a step which is 250 mm high if the roller handle makes an angle of 30o with the horizontal
Sunday, November 9, 2014 at 2:22pm

physical science
Sophia exerts a steady 40-N horizontal force on a 8-kg box resting on a lab bench. The box slides against a horizontal friction force of 24 N. Show that the box accelerates at 2 m/s2.
Sunday, November 9, 2014 at 11:17am

science
a mechanic applies the force of 50 N at a distance of 40 cm from the pivot on a wheel wrench . what is the size of the moment ?
Sunday, November 9, 2014 at 11:03am

SCIENCE
CAN WE USE A COPPPER VESSEL FOR STORING 1 MOLAR AgNO3 SOLUTION? IF NO JUSTIFY BY GIVING CHEMICAL REACTION BETWEEN THEM
Sunday, November 9, 2014 at 9:55am

Science
what happens to your body during exercise for eg sweats red cheeks and heartbeat
Sunday, November 9, 2014 at 9:30am

science
Which planets are the inner planets
Sunday, November 9, 2014 at 9:00am

science
Why is the system of sun and planets called the solar system
Sunday, November 9, 2014 at 8:49am

physics
I'm working on my science fair project for 5th grade. I want to measure the speed of rotation from an Ice skater. What type of equipment would I need to use? I think a video camera, a bright dot on the skater's chest and some type counter software. That's where I&#...
Saturday, November 8, 2014 at 6:01pm

Science: Chemistry
1. The element gold, Au, has a face-centered cubic structure. (Density - 19.3 g/cm^3) (a) What are the # of gold atoms in 1 unit cell? (b) What are the # of unit cells in 1 mol? (c) What is the volume of 1 mol gold unit cells? (d) What is the volume of 1 unit cell? (e) what is...
Saturday, November 8, 2014 at 2:39pm

science
what is in your ear?
Saturday, November 8, 2014 at 3:05am

Physics Science
How many kilocalories of heat are required to melt 20.0 kg of ice at 0°C? Okay so the given is m=20.0kg Ti=0°C HeatFusionIce=80 kcal/kg
Friday, November 7, 2014 at 7:15pm

Science
Calculate the kinetic energy change in the water that occurs when 10,000lb/hr flow in a pipe that is reduced from a diameter of 2 in. to a diameter to 1 in.
Friday, November 7, 2014 at 6:42pm

Science Help!!!!
Which sequence of processes must occur for an atom of carbon to go from a car to a tree? A. Resperation, decomposition B. Combustion, photosynthesis C. Fossilization, decompisition D. Fossilization, photosythesis Is the answer B? Thanks
Friday, November 7, 2014 at 4:47pm

science help!!!!!!!!!
Which sequence of processes must occur for an atom of carbon to go from car to a tree? A.resperation, decomposition B. Combustion, photosynthesis C. Fossilization, decomposition D. Fossilization, photosynthesis Is the answer B?
Friday, November 7, 2014 at 3:29pm

science help!!!!!!!!!
Carbon dioxide is obtained from the air and changed into carbohydrates and oxygen during the process of A. Fossilization B.resperation C.digestion D.photosynthesis Is the answer B?
Friday, November 7, 2014 at 3:17pm

science help!!!!!!!!!
You are creating a carbon cycle poster. In which way would you draw the arrows to show the movement of carbon through the process of resperation? A.from the rock to the air B.from the rock to the grass C.from the air to the wolf D. From the wolf to the air Is the answer D?
Friday, November 7, 2014 at 2:56pm

Science
What is cell
Friday, November 7, 2014 at 2:27pm

Science
What is the number of moles of HCl neutralized by .1 M NaOH. When NaOH has 14.24ml
Friday, November 7, 2014 at 1:08pm

Science
1. A balloonist drops an apple weighing 1.5 N over the side of the balloon's gondola. As it falls and increases speed, the drag force from the air upward on it increases. When the upward force is 0.7 N, what is the direction and magnitude of the net force on the apple? 9.8...
Friday, November 7, 2014 at 11:39am

Science
The latent heat of fusion for metal is 246kj per kg. How much heat would be used by melting 10 tonnes of metal?
Friday, November 7, 2014 at 5:51am

science
What would you need to know to determine the total amount of photosynthesis going on in the canopy and near the forest floor? Why?
Friday, November 7, 2014 at 2:23am

science Help 911!!
Carbon dioxide is obtained from the air and changed into carbohydrates and oxygen during the process of A. Fossilization B. Respiration C. Digestion D. Photosynthesis Is the answer D? Thanks
Friday, November 7, 2014 at 1:53am

science help!!!!!!!!!
You are creating a carbon cycle poster. In which direction would you draw arrows to show the movement of carbon through the process of resperation? A.from the rocks to the air B.from the rock to the grass C.from the air the wolf D.from the wolf to the air Is the answer D?
Thursday, November 6, 2014 at 11:43pm

science
Carbon dioxide is obtained from the air and changed into carbohydrates and oxygen during the process of A.fossilization B.resperation C.digestion D.photosynthesis Is the answer B?
Thursday, November 6, 2014 at 11:04pm

physical science
John is using a pulley to lift the sail on his sailboat. The sail weighs 150 N, and he must lift it 4.0 m. A. How much work must be done on the sail? B. If the pulley is 50% efficient, how much work must John do on the rope to lift the sail?
Thursday, November 6, 2014 at 9:34pm

physical science
A river does 6,500 j of work on a water wheel every second. The wheel efficiency is 12%. A. How much work in joules can the axle of the wheel do? B. What is the power output of the wheel in 1 s?
Thursday, November 6, 2014 at 9:30pm

physical science
A roller coaster car rapidly picks up speed as it rolls down a slope. As it starts down the slope, its speed is 4.25 m/s. But 3.2 s later, at the bottom of the slope it's speed is 22.75 m/s what is its average acceleration
Thursday, November 6, 2014 at 9:26pm

physical science
Calculate the kinetic or potential energy in joules for each of the following situations: A. A 2.5 kg book is held 2.0 m above the ground. B. A 15 g snowball is moving through the air at 3.5 m/s. C. A 35 kg child is sitting at the top of a slide that is 3.5 m above the ground...
Thursday, November 6, 2014 at 9:24pm

physical science
What is the kinetic energy of a 0.02 kg bullet that is traveling 300 m/s? Express your answer in joules.
Thursday, November 6, 2014 at 9:18pm

Science
Water is pumped from a stone basin up through a pipe 1 meter high. At that height, the water flows out through a tap and falls down through the air to the basin below, where the cycle begins again. What is the gravitational potential energy of 2.5 kilograms of water at the top...
Thursday, November 6, 2014 at 9:06pm

Science HELP
A student mixed two clear liquids together in a beaker and a solid precipitate formed. His data is shown in the table below. Liquid reactant A = 10 g Liquid reactant B = 17 g Beaker + solid product= 32 g What is the mass of the beaker? A. 5 g B. 10 g C. 15 g D. 17 g E. 32 g Is...
Thursday, November 6, 2014 at 8:51pm

Science HELP
According to the law of conservation of mass, what should the product side of this single replacement reaction look like? Zn+2HCl--->? A. H2ZnCl2 B. H2+Zn+Cl2 C. H2+ZnCl2 D. ZnCl2 Is the answer D?
Thursday, November 6, 2014 at 8:42pm

Science HELP
Sodium is a metal and chlorine is a poisonous gas. Neither is safe to eat. However, when sodium and chlorine combine, it produces edible table salt. What can be concluded? A. Table salt has similar physical properties of both reactants. B. Table salt is a metalloid with ...
Thursday, November 6, 2014 at 8:32pm

Science
A student mixed two clear liquids together in a beaker and a solid precipitate formed. His data is shown in the table below. Liquid reactant A = 10 g Liquid reactant B = 17 g Beaker + solid product= 32 g What is the mass of the beaker? A. 5 g B. 10 g C. 15 g D. 17 g E. 32 g Is...
Thursday, November 6, 2014 at 8:21pm

science
A 5.0 kg model vehicle travelling at 14 m/s experiences a rocket boost of 85 N ( in the direction of motion) for 20 s What is the resulting speed? The answer is 350 but i dont know how to get to that answer
Thursday, November 6, 2014 at 7:40pm

science.
1. Suppose the total momentum of two masses before a collision is 100 kg m/s. what is the total momentum of the two masses after they collide?
Thursday, November 6, 2014 at 6:59pm

Science
The letters that represent the different forms of a gene are called...? Phenotypes Traits Alleles Dominants. I think Dominant is out of the answer. I'm guessing the answer is Alleles.
Thursday, November 6, 2014 at 5:31pm

science
is a starch a complex carboydrate
Thursday, November 6, 2014 at 5:30pm

science
is a complex sugar an example of a starch? is a simple sugar an example of glucose?
Thursday, November 6, 2014 at 5:19pm

science
are starches and glucose all types of carbohydrates?
Thursday, November 6, 2014 at 5:02pm

Earth Science I suppose
What does the pattern of convection have to do with the typical path of a hurricane?
Thursday, November 6, 2014 at 4:22pm

Science
There are two forces acting on a box of golf balls, F1 and F2. The mass of the box is 0.750 kg. When the forces act in the same direction, they cause an acceleration of 0.450 m/s2. When they oppose one another, the box accelerates at 0.240 m/s2 in the direction of F2. (a) What...
Thursday, November 6, 2014 at 3:27pm

Science 8A
Umm, can someone give me an example of a stable system? Also, how were you able to determine whether or not this system is stable? Please help! Urgent!
Thursday, November 6, 2014 at 1:13pm

Science
A scientist is studying a plant species in which the flower color genes are codominant. The scientist crosses a plant with red flowers and a plant with white flowers. The offspring will most likely have A.red flowers B.white flowers C.pink flowers D.red flowers with white ...
Thursday, November 6, 2014 at 12:27pm

Science
A sled is at rest at the top of a 2 m high slope. The sled has a mass of 45 kg. What is the sled's potential energy?
Thursday, November 6, 2014 at 11:33am

science
brain central nervous system human being nerve tissue neurons Organize the parts of this body system in the CORRECT order according to the levels of organization in a multicellular organism, simplest to most complex..
Thursday, November 6, 2014 at 11:03am

Science
There are two forces acting on a box of golf balls, F1 and F2. The mass of the box is 0.750 kg. When the forces act in the same direction, they cause an acceleration of 0.450 m/s2. When they oppose one another, the box accelerates at 0.240 m/s2 in the direction of F2. (a) What...
Thursday, November 6, 2014 at 9:32am

Science, Physics
A 800kg safe is 2.3m above a heavy-duty spring when the rope holding the safe breaks. The safe hits the spring and compresses it 52cm.What is the spring constant of the spring?
Wednesday, November 5, 2014 at 11:08pm

Science
Effects of insecticide on aquatic animals?
Wednesday, November 5, 2014 at 9:57pm

Physics Science
How many grams of water at 20°C are necessary to change 800g of water at 90°C to 50°C? so its setup like (20*1.00)*(90-50)+(20*1.00)*(90-50) = 1600g?
Wednesday, November 5, 2014 at 9:16pm

Physics Science
How many grams of water at 20°C are necessary to change 800g of water at 90°C to 50°C?
Wednesday, November 5, 2014 at 5:56pm

Physics Science
Mary mixes 5.00 lb of water at 200°F with 7.00 lb of water at 65.0°F. Find the final temperature of the mixture. -Specific Heat of water is 1.00 BTU/lbs°F
Wednesday, November 5, 2014 at 4:59pm

science
what is the similarity of renewable and inexhaustible resource?
Wednesday, November 5, 2014 at 4:47pm

Science -- Ms. Sue, please help?
14. The energy role of the first organism in a food chain is always a(n) ___________. 15.Water is a(n) __________ factor in all ecosystems that all living things require. 16.___________bacteria carry out the conversion of gaseous nitrogen to a biologically useful form of ...
Wednesday, November 5, 2014 at 3:53pm

science, chemistry
OBJECTIVE: to find out which of two indicators, methyl orange or phenolphthalein, gives more reliable and consistent results in the titration of H3PO4 with NaOH. REQUIREMENT: (1). Phosphoric acid solution of unknown concentration. (2). Standard NaOH solution. (3). Methyl ...
Wednesday, November 5, 2014 at 12:53pm

Science
In an atom, electrons ____. a. are located in the nucleus b. travel outside the nucleus c. are paired with neutrons d. are always in the same place in an atom
Wednesday, November 5, 2014 at 11:30am

Science
brain central nervous system human being nerve tissue neurons Organize the parts of this body system in the CORRECT order according to the levels of organization in a multicellular organism, simplest to most complex..
Wednesday, November 5, 2014 at 11:04am

science
which of these is an one of aluminum?
Wednesday, November 5, 2014 at 9:11am

Science
Choose if this relationship is Predation, Competition, Commensalism, Mutualism, Parasitism, Producer/Consumer The egret is a bird that follows herds of cattle in order to catch and eats infects that are stirred up as the cattle move around. What type of relationship exists ...
Tuesday, November 4, 2014 at 6:27pm

Science
Choose if this relationship is Predation, Competition, Commensalism, Mutualism, Parasitism, Producer/Consumer This tomato hornworm is covered with cocoons depositied by wasps. The alrvae of the waspa will feed on the worm and eventually cause its death. What type of ...
Tuesday, November 4, 2014 at 6:26pm

Science
Zoysia is a type of grass. It uses lighjt energy to make food. Grasshoppers feed upon zoysia for energy. What type of relationshipe xists between zoysia and grasshoppers? Is it Mutualism? Mutualism is when both organisms benefit
Tuesday, November 4, 2014 at 6:25pm

Science
Choose if this relationship is Predation, Competition, Commensalism, Mutualism, Parasitism, Producer/Consumer Relationship 1 : This bee is feeding on the nectar from this flower while at the same time collecting polent o transfer to different flower. What is the relationship ...
Tuesday, November 4, 2014 at 6:24pm

Science Physics
How many Btu of heat must be added to 1200 lb of copper to raise its temperature from 100°F to 450°F -specific heat for copper is 0.092-
Tuesday, November 4, 2014 at 6:06pm

Science (How Do I Do This?)
A car skids to a stop at a traffic light, leaving behind a 8.25m skid mark as it comes to a rest. Assuming that the car is travelling at 14.5m/s and only the friction from the tires on the roadway stop the vehicle. Find the coefficient of friction
Tuesday, November 4, 2014 at 5:47pm

Urgent Science Question!
A 921kg sports car is moving rightward with a speed of 29.0m/s. The driver suddenly slams on the brakes, causing a 8347N resistive net force and the car skids to a stop. Determine the time it takes to stop the car.
Tuesday, November 4, 2014 at 5:29pm

Science Question
Richard has to move a 45.5kg couch in order to vacuum behind it. He is able to push against it with a force of 85.3N. He does unfortunately have to work against friction, but thankfully the coefficient of friction is very small 0.082 since it is on pads and a hard wood floor. ...
Tuesday, November 4, 2014 at 11:00am

Science
Susie decides to pull on a 1.5kg toy (horizontally) with a force of 25N. Friction acts against the toy with a force of 6n. What is the acceleration of the toy?
Tuesday, November 4, 2014 at 9:36am

Social Science
Essay on "The Arabs made Islam one of the most powerful force in Asia". Please help ASAP.
Tuesday, November 4, 2014 at 6:12am

science
Using the systematic method and information in the Appendices F and J (note that log value is given in Appendix J), determine [SCN-], [Hg2+], and [HgSCN+] at equilibrium when Hg(SCN)2(s) is dissolved in water.
Tuesday, November 4, 2014 at 12:45am

Science
How many grams of CH3SH must be added to water to prepare 410mL of a solution that is 2.5 M CH3SH?
Tuesday, November 4, 2014 at 12:42am

Science
what is the concentration (M) of a MgCl2 solution prepared by dissolving 7.2 g of MgCl2 in sufficient water to give 362 mL of solution?
Tuesday, November 4, 2014 at 12:40am

Science
How many grams of H2SO4 are in 125 mL of a 3.00 M solution of H2SO4?
Tuesday, November 4, 2014 at 12:27am

Science Physics
How many Btu of heat must be added to 1200 lb of copper to raise its temperature from 100°F to 450°F
Monday, November 3, 2014 at 5:58pm

science
Jay is going to school. To reach the school, Jay need to go 3km going north. Then, he will head to the east at a distance 7km, then 3km going south and 2km going east. 1. Find the distance 2. Find the displacement
Monday, November 3, 2014 at 5:47pm

Science Physics
A lifeguard swims with her head just above the water. What is the volume of the submerged part of her body if she weighs 600 N? Would I need to divide by 9800 or 62.4?
Monday, November 3, 2014 at 4:15pm

SCIENCE
4. Convert to centimeters: 6.8 meters A. 6,800 centimeters B. 68 centimeters C. 68,000 centimeters D. 680 centimeters 5. What is the difference between a theory and an opinion? A. A theory is supported by scientific evidence, while an opinion is not. B. An opinion is supported...
Monday, November 3, 2014 at 1:50pm

science
Calculate the PRP, PRF, PD, DF, SPL, wavelength, period, and Axial Resolution if a 2 cycle pulse emitted from a 10 MHz transducer if the echo time received was 0.26 ms in soft tissue. Part II - Using the information above: 1. If the PRF decreases what happens the DF? 2. If ...
Monday, November 3, 2014 at 1:36pm

science
car doing 60 mph skide for 52.3 mts what is the speed at end of skid
Monday, November 3, 2014 at 12:43pm

physical science check asap
1. Tommy performed an experiment to test the solubility of sodium chloride in water. After he completed his experiment, he discovered that he had a few unused grams of NaCl leftover in a beaker. What should he do with the excess NaCl? A. Pour the excess back into the original ...
Monday, November 3, 2014 at 12:20pm

physical science
1. Tommy performed an experiment to test the solubility of sodium chloride in water. After he completed his experiment, he discovered that he had a few unused grams of NaCl leftover in a beaker. What should he do with the excess NaCl? A. Pour the excess back into the original...
Monday, November 3, 2014 at 11:50am

science
Jay is going to school. To reach the school, Jay need to go 3km going north. Then, he will head to the east at a distance 7km, then 3km going south and 2km going east. 1. Find the distance 2. Find the displacement
Monday, November 3, 2014 at 10:21am

Science
A uniform beam has a weight of 500N(acting at the centre of the beam). It also carries a point load of 1,2kN at the centre of the left half of the beam, and a point load of 820N at distance of one eighth of the beam's lenght from the right hand side. The support are at the...
Monday, November 3, 2014 at 10:16am

science
Jani is planning to go to Jojo's house, Jani has to walk 30m going east. Then, he will head to the north at a distance of 40 meters. Afterwards, he will walk 70m going west. 1. Determine the total distance travelled by Jani's. 2. Calculate Jani's displacement. 3. ...
Monday, November 3, 2014 at 10:11am

science
A non-electronic conductor is
Monday, November 3, 2014 at 9:48am

science
Which of the mineral does not contain oxygen?
Monday, November 3, 2014 at 9:46am

science
The best example of polyembryony is
Monday, November 3, 2014 at 9:44am

science
Which of these waves can be polarized ?
Monday, November 3, 2014 at 9:43am

science
If a wire of resistance R is melted and recast to half of its length then the new resistance of the wire will be
Monday, November 3, 2014 at 9:39am

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