Homework Help: Science

Branches of Science

Recent Homework Questions About Science

science
I'm trying to unscramble the following letters to make a sentence. Help! ipsoosousceeeuysethsumtatdoyngc
Friday, May 24, 2013 at 11:28am

science
calculate the amount of hydrogen gas involved if ferrous + 2hcl = ferrous choloride + h2 if 55 gramme iron is reacting with 36.5 hydrochloric acid .
Friday, May 24, 2013 at 11:05am

science
how do we know that there are 100 trillion cells in our body i mean who count them or is there any activity behind?
Friday, May 24, 2013 at 12:18am

Science
Explain if quadruplets-four babies born at one birth are always identical or always fraternal, or if they can be either.
Thursday, May 23, 2013 at 7:20pm

science
Describe three potential extraneous variables in your experiment on whether prayer causes healing. Support your answer
Thursday, May 23, 2013 at 6:44pm

Science
True or False: The input current to a transformer is direct current.
Thursday, May 23, 2013 at 6:05pm

SCIENCE - HELP PLEASE!
Some materials are magnetic because... A. their protons are magnetic B. their atoms behave like magnets C. they have magnetic fields around them D. they have a north pole (I think it's C.)
Thursday, May 23, 2013 at 5:20pm

science
If you were to conduct an experiment on prayer and healing, what would be the best way to acquire your sample so as to eliminate any bias?
Thursday, May 23, 2013 at 5:03pm

science
Describe three potential extraneous variables in your experiment on whether prayer causes healing
Thursday, May 23, 2013 at 12:48pm

science grade 8
Please, explain why do you think that blowout preventer (BOP)was likely a hydraulic system (in the 2010 Deep Water Horizon oil spill accident), and what are the advantages and disadvantages of this hydraulic system in the Deep Water Horizon oil spill. Give an example from this...
Thursday, May 23, 2013 at 12:45pm

curriculum content
when are children first developmentally ready to begin learnig science?
Thursday, May 23, 2013 at 12:39pm

Science (2nd Try)
To determine the boing point of a liquid, a student heats 10 mL of the liquid in a test tube and records the temperature every minute for 20 minutes. In this example, time is the what? The choices are: Independent variable dependent variable hypothesis control Is it dependent ...
Thursday, May 23, 2013 at 12:06pm

science
How can you attempt to control for any extraneous variables within a sample experiment on prayer and healing?
Thursday, May 23, 2013 at 11:01am

science
If you were to conduct an experiment on whether prayer causes healing, what would the dependent variable be?
Thursday, May 23, 2013 at 10:27am

science
Formulate a testable hypothesis to make a specific prediction about whether prayer causes healing.
Thursday, May 23, 2013 at 10:15am

physical science
On a new temperature scale the steam point is 348 °X, and the ice point is 112 °X. What is the temperature on this scale that corresponds to 28.0 °C?
Thursday, May 23, 2013 at 5:54am

math,science
if 5cosa + 3 = 0 and 180<a<360 , find the value of 3tana + 25sin^2a
Thursday, May 23, 2013 at 12:57am

6th grade science
The erosive energy of rivers alters landscapes over periods of millions of years. Which of the following increases a river's rate of erosion? A)low gradient B)high discharge C)small load D)decreased speed
Wednesday, May 22, 2013 at 11:24pm

science
CH4 + O2CO2 + 2H2O
Wednesday, May 22, 2013 at 8:43pm

Science
To determine the boing point of a liquid, a student heats 10 mL of the liquid in a test tube and records the temperature every minute for 20 minutes. In this example, time is the what? The choices are: Independent variable dependent variable hypothesis control Is it dependent ...
Wednesday, May 22, 2013 at 7:41pm

Science
How often must a tractor be serviced?
Wednesday, May 22, 2013 at 4:51pm

science
a ball is projected at an angel of 45 degree to the horizontal.if the horizontal range is 40m,the maximum height attained by the ball is- a)5m b)8m c)10m d012m
Wednesday, May 22, 2013 at 4:28am

science
How is molecular formula and emperial formula related
Tuesday, May 21, 2013 at 9:17pm

Science
Did Apollo astronauts contributed to our knowledge of the moon's structure?
Tuesday, May 21, 2013 at 6:13pm

science
Based on your knowledge of the garbage assemblage, what can you learn about the person(s) who created it and how might this be used to draw conclusions about their lives (e.g., diet, age, socioeconomic status, gender etc.)? It can be any garbage assemblage? Here are some ...
Tuesday, May 21, 2013 at 3:29pm

Science Help
mass = 4.5 kg Compare and contrast the mass and weight of this bowling ball on Earth and the moon.
Tuesday, May 21, 2013 at 2:31pm

science
Based on your knowledge of the garbage assemblage, what can you learn about the person(s) who created it and how might this be used to draw conclusions about their lives (e.g., diet, age, socioeconomic status, gender etc.)? Here are some things to think about: can you tell ...
Tuesday, May 21, 2013 at 11:34am

giving up
i'm depressed that no-one has answered my science question so i'm giving up and i don't care if i fail my science because it will be all googles fault the only thing i know about the xenon 135 is that it's a tennis/squash racket and i needed the element xenon ...
Tuesday, May 21, 2013 at 9:32am

science
a body moving with a uniform acceleration travels distance of 24m and 64m during the first two equal consecutive interval of time,each of duration 4s.determine the initial velocity and acceleration of the moving body
Tuesday, May 21, 2013 at 8:15am

Science
Identify and describe the type of radiation emitted during the radioactive decay of the radioisotope xenon 135
Tuesday, May 21, 2013 at 7:49am

Science
How do I identify between Zn, Al, and Mg ions in solution?
Tuesday, May 21, 2013 at 7:37am

science
is batteries powering a flashlight an example of chemical potential energy to electrical energy?
Monday, May 20, 2013 at 10:54pm

physical science
you do 16,000 j of work on a 45 kg box intitally going 11.8 m/s. How fast is it going now?
Monday, May 20, 2013 at 7:56pm

science
how i s fishing line measured
Monday, May 20, 2013 at 3:47pm

Computer Science
How we develop the game in C language?
Monday, May 20, 2013 at 6:21am

Science
Fortune teller's use crystal balls to see the future. A fortune teller has a crystal ball with an index of refraction of 1.5 and diameter of 0.2 m. You sit on one side of the ball and the fortune teller sits on the other. She holds up a small red jewel on her side in the ...
Monday, May 20, 2013 at 1:17am

Science
The galaxies in the universe are all flying away from each other. The speeds of nearby galaxies are proportional to the distance the galaxy is away from us. This relation, v=Hd is known as Hubble's law and the constant H is known as Hubble's constant. The evolution of ...
Monday, May 20, 2013 at 1:17am

Science
A 15 kg, 1m wide door which has frictionless hinges is closed but unlocked. A 400 g ball hits the exact middle of the door at a velocity of 35 m/s and bounces off elastically, thereby causing the door to slowly swing open. How long in seconds does it take for the door to fully...
Monday, May 20, 2013 at 1:16am

science
where does the energy needed to heat up cold water come from?
Sunday, May 19, 2013 at 10:43pm

science energy conversions
List the energy conversions in these situations. A drum set causes many dishes to rattle. Temperature differences cause wind.
Sunday, May 19, 2013 at 9:58pm

science
would you expect more fertile land near the river in the mountains or on flat land
Sunday, May 19, 2013 at 7:44pm

Film
Which of the following is true of the screenwriter’s role in making movies? (Points : 1) A film begins with a writer’s story Film is generally considered a writer’s medium The writer is more important than the rest of the cast and crew Writing scripts is an ...
Sunday, May 19, 2013 at 4:45pm

science
a particle takes 6.28seconds to complete one revolution.its angular speed is
Sunday, May 19, 2013 at 2:54pm

science
A science teacher tells her class that their final project requires the students to measure a specific variable and determine the velocity of a car with no more than 2.5% error. Jennifer and Johnny work hard and decide the velocity of the car is 34.87 m/s. The teacher informs ...
Sunday, May 19, 2013 at 10:05am

science
List the energy conversions in these situations. A drum set causes many dishes to rattle. Temperature differences cause wind.
Saturday, May 18, 2013 at 10:41pm

science
A scientist experiments on two different pairs of objects. During the experiment, the objects in one of the pairs are brought into contact with each other; the objects in the other pair are brought close together, but they do not touch. The scientist then compares the number ...
Saturday, May 18, 2013 at 6:45pm

Science
Explain the law of motion needed to solve thisproblem . On Planet Zorg, a 30 kg barbell can be lifted by only exerting a force fo 180N. What is the acceleration of gravity on Planet zorg? Predict how the motion of this object would change if on earth.
Saturday, May 18, 2013 at 12:39pm

hsa practice
Stephanie scored 88, 70, 84, and 72 on her first four science tests. What score does Stephanie need on her fifth science test to receive a mean score of 80? can you give me the steps to solve this im practicing for hsa
Saturday, May 18, 2013 at 11:58am

Science
does more magnetic force indicate a stronger magnet?
Friday, May 17, 2013 at 11:54pm

science
If the current in a wire is at 0.5 A and the voltage is measured at 100 volts, what is the resistance in the wire? Show all work and include the proper units.
Friday, May 17, 2013 at 5:06pm

science
Do you think, based on knowledge, that the portrayal of anthropology in the media is correct and/or appropriate in this article Neanderthal culture: Old masters Author:Tim Appenzeller
Friday, May 17, 2013 at 4:54pm

science
Do you think, based on knowledge, that the portrayal of anthropology in the media is correct and/or appropriate in this article Cambridge-based scientists develop 'superwheat' Website: BBC News
Friday, May 17, 2013 at 4:54pm

science
Do you think, based on knowledge , that the portrayal of anthropology in the media is correct and/or appropriate in this article Dogs and Humans Evolved Together, Study Suggests Author:Tia Ghose, LiveScience Staff Writer
Friday, May 17, 2013 at 4:51pm

science
Do you think, based on knowledge acquired, that the portrayal of anthropology in the media is correct and/or appropriate in this article Neanderthal culture: Old masters Author:Tim Appenzeller
Friday, May 17, 2013 at 4:39pm

Science
When heated solid iron3 hydroxide decomposes to produce iron 3 oxide and water vapor if 0.75L of water vapor is produced at 227 degrees celsius and 1.0 aTm. how many grams of FE(OH)3 were used?
Friday, May 17, 2013 at 3:14pm

science
Do you think, based on knowledge acquired in this module, that the portrayal of anthropology in the media is correct and/or appropriate in this article Neanderthal culture: Old masters Author:Tim Appenzeller
Friday, May 17, 2013 at 1:07pm

science
Do you think, based on knowledge acquired in this module, that the portrayal of anthropology in the media is correct and/or appropriate in this article Cambridge-based scientists develop 'superwheat' Website: BBC News
Friday, May 17, 2013 at 1:06pm

science
Do you think, based on knowledge acquired in this module, that the portrayal of anthropology in the media is correct and/or appropriate in this article Why Humans Took Up Farming: They Like To Own Stuff Author: Rhitu Chatterjee
Friday, May 17, 2013 at 1:03pm

science
Do you think, based on knowledge acquired in this module, that the portrayal of anthropology in the media is correct and/or appropriate in this article Dogs and Humans Evolved Together, Study Suggests Author:Tia Ghose, LiveScience Staff Writer
Friday, May 17, 2013 at 1:02pm

science
what is the valency of sodium
Friday, May 17, 2013 at 11:30am

science
in which direction are nearly all galaxies moving relative to earth
Thursday, May 16, 2013 at 5:09pm

science
a 10ufcapacitoris chargedby 30Vd.c supply and then connected across an uncharged 50uf capacitor(1)the final potential difference across the combination (2) the initial and final energies. How will you account for the difference in energy
Thursday, May 16, 2013 at 4:14pm

physical science
how many kilojoules of heat must be transferred to a 480-g aluminum pizza pan to raise its temperature from 22c to 234c
Thursday, May 16, 2013 at 1:49pm

science
which of the following is used to measure 10.8cm3 of dilute hydrochloric acid? A.BURRETE B.BEAKER C.MEASURING CYLINDER D.PIPPETE
Thursday, May 16, 2013 at 8:01am

science
which of the following is to used to measure 10.8cm3 of dilute hydrochloric acid?
Thursday, May 16, 2013 at 7:22am

science
4gm NaOH are contained in 1deci litre of a solutio,calculate the mole fraction of NaOH?
Thursday, May 16, 2013 at 4:19am

science
What is the mole fraction of NaOH,when 4gm of NaOH contained in 1deci litre of solution?
Thursday, May 16, 2013 at 4:17am

Science
Two point charges +q=1 ìC and −q=−1 ìC with mass m=1 g are fixed at the positions ±r ⃗ 0 with |r 0 |=1 m . The charges are released from rest at t=0 . Find the time ô in seconds at which they collide.
Wednesday, May 15, 2013 at 11:06pm

science
Exhibit a behaviour that you do every day that you think is influenced by heredity and environment. Describe how three of the seven modern perspectives/approaches of psychology would be used to explain your behavior. Make sure that your discussion is not too personal in nature...
Wednesday, May 15, 2013 at 10:20pm

science
10 ways in which the environment helth hazard can impact negatively on ones health
Wednesday, May 15, 2013 at 5:23pm

Science
Does mass increase or decrease when the distance stays the same and the force of gravity between two objects decreases?
Wednesday, May 15, 2013 at 12:48pm

science
can gardens count as using agricultural land?
Wednesday, May 15, 2013 at 12:48pm

Science
Is the near side (facing earth)always the dark side?
Wednesday, May 15, 2013 at 12:33pm

Science
A 0.2 kg object is released from rest at point A on a track that is one-quarter of a circle with radius 1.6 m, as shown in the figure. It slides down and reaches point B with a speed of 4.8 m/s. Then it slides on a level surface a distance of 3 m until it comes to rest at ...
Wednesday, May 15, 2013 at 12:13pm

Science (bobpursley)
Does mass increase or decrease when the distance stays the same and the force of gravity between two objects decreases?
Wednesday, May 15, 2013 at 10:54am

Science
which of the following is an example of a mineral? silver, lava, fossils, sand, I say Lava
Wednesday, May 15, 2013 at 7:25am

science-physics
A worker sits at one end of a 183-N uniform rod that is 2.80 m long. A weight of 107 N is placed at the other end of the rod. The rod is balanced when the pivot is 0.670 m from the worker. Calculate the weight of the worker
Wednesday, May 15, 2013 at 1:51am

science
how can you define the problem how far can you make a rubber stopper fly through the air if the only force applied comes from a gas forming chemical reaction
Wednesday, May 15, 2013 at 12:55am

Science 1 question SPACE
I re-posted this question because noone helped and I need help fast! I am doing a project on the planet uranus and I need a map showiong the path to my planet that i have chosen. The picture of the path must include asteroids, comets or other interesting objects. I am having ...
Tuesday, May 14, 2013 at 10:42pm

Science space
I am doing a project on the planet uranus and I need a map showiong the path to my planet that i have chosen. The picture of the path must include asteroids, comets or other interesting objects. I am having so much trouble looking for such a picture. I have tried looking on ...
Tuesday, May 14, 2013 at 10:18pm

Science (bobpursley)
Why is an extra day added to February every four years?
Tuesday, May 14, 2013 at 9:51pm

Science
what kind of energy is stored before the earthquake
Tuesday, May 14, 2013 at 8:55pm

science, psychology
Exhibit a behaviour that you do every day that you think is influenced by heredity and environment. Describe how three of the seven modern perspectives/approaches of psychology would be used to explain your behavior. Make sure that your discussion is not too personal in nature...
Tuesday, May 14, 2013 at 6:30pm

science
In one location pesticides called pyrethoids were used to control winter moths and leaf miners in apple orchards. Unfortunately, the chemicals killed more insects than intended, including predators of red mites and apple mites. After orchards were sprayed with pyrethoids, the ...
Tuesday, May 14, 2013 at 6:12pm

science
First find the impedance of each circuit. then find the voltage across: current through and power dissipate by each resistor. Construct a data table to organize your answers
Tuesday, May 14, 2013 at 4:43pm

science
A 27 kg gun is standing on a frictionless sur- face. The gun fires a 56 g bullet with a muzzle velocity of 314 m/s. The positive direction is that of the bullet. Calculate the momentum of the bullet im- mediately after the gun was fired. Answer in units of kg · m/s ...
Tuesday, May 14, 2013 at 1:26pm

science
An attack helicopter is equipped with a 20- mm cannon that fires 61.6 g shells in the forward direction with a muzzle speed of 585 m/s. The fully loaded helicopter has a mass of 4890 kg. A burst of 208 shells is fired in a 2.32 s interval. What is the resulting average force ...
Tuesday, May 14, 2013 at 1:21pm

science
The nonliving matrix of the connective tissue through which the blood cells freely flow is the? A.plasma. B. extracellular fluid. C. intracellular fluid. D. submucosa.
Tuesday, May 14, 2013 at 1:02pm

science
The scientific binomial name of a species is Canis vulpis. Which of the following is true? A. The species belongs in the family Cranis. B. the species belongs in the genus vulpis. C. the species belongs in the genus Canis. D. the species belongs in the family vulpis.
Tuesday, May 14, 2013 at 12:58pm

science
You plan to generate many copies of this gene by PCR. You will then insert the PCR product into the plasmid. d) Which two primers from the list below will allow you to use PCR to amplify this gene? Check the two that apply. 5'-GTGCA-3' 5'-CACGT-3' 5'-TATGG-...
Tuesday, May 14, 2013 at 12:10pm

science physics
1.) What is the Magnitude of the electrostatic force on a +5 C charge 1.75 m to the left of a -2.5 C charge? (show your work) 2.) In What direction does the force on the +5 C charge act? 3.)Calculate the magnitude of the electric field of the -2.5 C charge at the location of ...
Tuesday, May 14, 2013 at 10:42am

physical science
If the mass of a plane is 2,500 kg and the net force on it is 14,000 N, what is the plane's acceleration?
Tuesday, May 14, 2013 at 10:35am

Science (chemistry) help please
The following data was obtained from titrating a solution containing 25 mL of 0.0100 M MgCl2 solution, 1 mL of NH3OH buffer, and 10 drops of Calmagite with EDTA. Calculate the concentration of EDTA. Report the answer with three sig figs. I don't know what to do? I know ...
Tuesday, May 14, 2013 at 1:47am

Science
describe the changes in volume, motion, and energy that gas particles experience as heat is taken away
Monday, May 13, 2013 at 7:58pm

Science
Please for information on how to care each classification of metals.
Monday, May 13, 2013 at 7:56pm

Science
Please for the classification of metals, their uses in the home and the care of each metal. Please help me!!!!!!
Monday, May 13, 2013 at 4:59pm

Physical Science
Blood is pumped from the heart at a rate of 5L/min into the aorta of radius 2.0cm. Assuming that the density of blood 1x103 kg/m3 .Determine the velocity of blood through the aorta
Monday, May 13, 2013 at 3:41pm

Physical Science
A dentist’s chair with a patient in it weight 2100N. The output plunger of a hydraulic system begins to lift the chair, when the dentist’s foot applies of 55N to the input piston. Neglect any height difference between the plunder and the piston. What is the ratio of ...
Monday, May 13, 2013 at 2:25pm

science
I need an example of an acrostic poem for the word kinetic please help!!!!!!
Monday, May 13, 2013 at 2:16pm

Physical Science
- What is the kinetic energy ,KE, per unit volume V of blood that has a speed of 0.5 m/s. Take density ofƒâblood = 1.0x103kg/m3
Monday, May 13, 2013 at 12:27pm

science
5 mL O.1 M HCL...How much 0.1 M NaOH is needed to neutralize the acid? Thank you
Monday, May 13, 2013 at 11:50am

Science
Metals used in the home and classification. Uses and how they may be cared.
Sunday, May 12, 2013 at 10:09pm

science
A form of energy that is always transferred from a warmer substance to a cooler one.
Sunday, May 12, 2013 at 9:04pm

Philosophy
Since Jessica’s participation in local politics increased significantly after she joined her school’s political science club, it is clear that her involvement in that club led her to take an interest in politics. The argument above is flawed because
Sunday, May 12, 2013 at 8:04pm

math for laboratory science
Determine the quantity of stock 75.0% v/v EtOH required to prepare 300ml of a 25.0% v/v EtOH solution
Sunday, May 12, 2013 at 1:32pm

science
assign oxidation numbers to each atom in the following compounds : Hi Pbr3 Ges2 Kh AS2O5
Sunday, May 12, 2013 at 7:43am

science physics
a boy is runnig on a striaght road he runs 500 m towards north in 2 m 10 s and then turns back and runs 200m in1 m calculate the average speed
Sunday, May 12, 2013 at 2:08am

physical science
How to unscramble this word isarntucio
Saturday, May 11, 2013 at 11:58pm

science
vertical distance equation for a freely falling object
Saturday, May 11, 2013 at 10:08pm

science
a stone of mass 50g is being rotated in a circle of r 50cm with a uniform speed of 2m\s. what is the acceleration of the stone
Saturday, May 11, 2013 at 12:40am

Computer Science
Would like to know if this looks right 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...
Friday, May 10, 2013 at 5:11pm

science
For the oxidation of glucose ( C6H12O6 + 2O2---„³6H2O +6CO2), how many moles of O2 will it take to consume 6 moles of glucose.
Friday, May 10, 2013 at 4:15pm

science
Discuss the relationship between motion and force including the following terms: velocity, acceleration, equilibrium, contact force, and field force.
Thursday, May 9, 2013 at 4:50pm

Math
A teacher is choosing 4 students from a class of 30 to represent the class at a science fair. In how many ways can the teacher choose the students?
Thursday, May 9, 2013 at 4:38pm

Science
1. What is molarity of products? I can't decide if it's a. The concentration of the reactants measured in mol/L of solution or b. The concentration of the products measured in mol/L of solution 4. How does pressure relate to reaction rates? I'm stuck between a. ...
Thursday, May 9, 2013 at 12:55pm

Environmental Science
Consider the population situation in Italy or Germany; very low birth rates, an aging population, and eventual decline in overall numbers. For this week's individual work, please write a 1-2 page paper (counting body text only, not title or reference pages) in double-...
Thursday, May 9, 2013 at 12:05am

Life science
How does the sun allow you to Run the mile
Wednesday, May 8, 2013 at 11:56pm

Science
A constrained string with a length of 8.5 meters is vibrating at its fundamental frequency of 113.1 Hz. What is the frequency of the 7th harmonic on this string?
Wednesday, May 8, 2013 at 11:41pm

Science
Please for diagrams to show the terms associated in the study of levers.
Wednesday, May 8, 2013 at 6:54pm

Science
Please explain the terms associated with the study of levers.
Wednesday, May 8, 2013 at 5:21pm

science
there is technology day celebration in our school. I have to give a speech on a new technology that has developed recently and very rarely known. Please give me some ideas.
Wednesday, May 8, 2013 at 2:46pm

science
a car of mass 100 kg traveling at 72 km/hr is brought to rest by applying the brakes.assuming that the kinetic energy of the car becomes transferred to internal energy in four steel brakes drum of equal mass, fine the rise in temperature of the drums if the total is 20kg, the ...
Wednesday, May 8, 2013 at 9:42am

physical science
if the maximum amount of water vapor in the air at 15 degrees c is 12.5 g/m^3, what is the actual amount of water vapor in the air if the relative humidity is 85.0%
Wednesday, May 8, 2013 at 9:39am

Science
100 ml of water at 20 degrees celcius has more,less, or the same thermal energy than 500 ml of water at 20 degrees?
Tuesday, May 7, 2013 at 9:44pm

Science help please, thanks!
Can you maybe give me two examples for action-reaction forces? I'm curious. Thanks!
Tuesday, May 7, 2013 at 8:50pm

Science
These are some more questions, they're not multiple answers they're S.A so the questions will be first and my answers will be on the bottom. 17. Describe the difference between thermal energy and temperature. Use the following words to help structure your answer: ...
Tuesday, May 7, 2013 at 12:47pm

Science
Please check my answers (at the bottom) with these questions. 1. An apple quickly changes color when exposed to air. This demonstrates a ________. (1 point) physical property chemical property physical change all of the above 2. When a chunk of dry ice is at room temperature, ...
Tuesday, May 7, 2013 at 12:22pm

Science
If A tank with a flat bottom is filled with water to a height of four meters. what is the pressure at any point at the bottom of the tank? my teacher wants me to ignore atmospheric pressure when calculating my answer A. 3.5 kPa B. 3,500 kPa C. 34.3 kPa D. 34,300 kPa
Tuesday, May 7, 2013 at 11:21am

SCIENCE
IF SOMEONE WHEIGHS 12 KG ON THE MOON SO HOW MUCH HE WILL WEIGH ON THE EARTH
Tuesday, May 7, 2013 at 11:04am

physics
A 16 lb block rests on a horizontal frictionless surface. A cord attached to the block, running horizontally, passes over a pulley whose diameter is 1 in, to a hanging block weighing 16 lb. The system is released from rest, and the blocks are observed to move 7.6 ft in 4 s. ...
Monday, May 6, 2013 at 9:04pm

physics
A solid sphere rolls up an inclined plane of inclination angle 35 degrees. At the bottom of the incline, the center of mass of the sphere has a translational speed of 13 ft/s. How far (in feet) does the sphere roll up the plane (distance along the plane)?
Monday, May 6, 2013 at 9:03pm

science
how many oxygen atoms are in 773.2g of carbon dioxide? and also what is the molar mass of an element where 3.4 moles of the element has a mass of 669.69g? which elent is it?
Monday, May 6, 2013 at 7:51pm

Physical Science
1. What is molarity of products? I can't decide if it's a. The concentration of the reactants measured in mol/L of solution or b. The concentration of the products measured in mol/L of solution 4. How does pressure relate to reaction rates? I'm stuck between a. ...
Monday, May 6, 2013 at 7:28pm

Science
At which point is more silt in the water in the mountains or on flatland why
Monday, May 6, 2013 at 5:45pm

Life Science
If a sponge (from the ocean, not a cleaning sponge. :P) were torn apart by a predator, what would happen?
Monday, May 6, 2013 at 4:25pm

science
An atom loses an electron. What will happen when it approaches a positively-charged ion? A. The ions will repel each other. B. The ions will attract each other. C. The ions will cancel each other out. D. The ions will neither attract nor repel each other.
Monday, May 6, 2013 at 2:51pm

Life science
How would u experiment be affected if you added a few drop of concetrated sodium hydroxide to test tube
Monday, May 6, 2013 at 1:04pm

Science
How a lack of nutrients in the soil can affect plant growth?
Monday, May 6, 2013 at 12:43pm

Science
Where can liquid manure be obtained from?
Monday, May 6, 2013 at 12:40pm

management science
Suppose the results of an IQ test are normally distributed, with a mean of 10 and a standard deviation of 16. If 150 people took the test, how many do you expect would score between 95 and 130?
Monday, May 6, 2013 at 9:29am

science help plzzzzzzzzzzzzzzz?
A planet orbiting a star is occasionally hit by comets. Each comet has a mass of 4.8 × 10^6 kg of which 30% is rock and 70% is water ice. Each time a comet hits the planet 40% of the mass of the comet is vaporised and the rest is added to the planet, increasing the mass ...
Monday, May 6, 2013 at 7:57am

physics
A typical science question young people have is "Why can a glass can contain water?" and a typical answer is "Because the distance between molecules that make up the glass is smaller than the size of each water molecule." This isn't quite right though. ...
Monday, May 6, 2013 at 4:48am

science
what happens to the G-force as the speed of the centrifuge increases?
Sunday, May 5, 2013 at 10:03pm

Physical Science
if a blue object is placed in front of the screen, what color will it be? explain the answer.
Sunday, May 5, 2013 at 1:51pm

Physical Science
A car of mass 900 kg moves at 10 m/s. What is the braking required to stop the car in a time of 5 seconds
Sunday, May 5, 2013 at 1:34pm

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