Homework Help: Science

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Recent Homework Questions About Science

science
what will be the law of conversion of a) 65 grams 70 grams b) magnesium + oxygen = magnesium oxide 45 grams ? grams 80 grams c) sodium hydroxide + hydrochoride acid 40 grams 36.5 grams sodium chloride + water ? grams 18 grams
Saturday, August 4, 2012 at 12:35pm

science
Hi, I was wondering if I answered this question correctly #1-Two kinds of cell-transport are used in the process that forms ATP. Name the two types of transport and describe how they take place. Electron transport is not a form of cell transport. #1- I think the passive and ...
Saturday, August 4, 2012 at 8:39am

science
a bullet of mass0.01 kg and travelling with a speed of 500m/s strikes a block of mass 2 kg which is suspended by a string of length 5m. The center of gravity of the block is found to raise vertical distance of 0.1m. The speed of bullet after emerging from block is:
Saturday, August 4, 2012 at 1:15am

science
A chair of mass 15.5 is sitting on the horizontal floor; the floor is not frictionless. You push on the chair with a force = 38.0 that is directed at an angle of 42.0 below the horizontal and the chair slides along the floor.Use Newton's laws to calculate the normal force ...
Friday, August 3, 2012 at 4:48am

Science
Why CuO powder not soluble in hexane and methanol?
Wednesday, August 1, 2012 at 2:39am

reading
(1) After my interview with these four young people, I reflected on the quiet sense of "difference" I sensed with many of these Upward Bound students. (2) As a college teacher who has also taught seventh-grade science, I have some experience with the faces and ...
Tuesday, July 31, 2012 at 3:06pm

Science math, science, social studies
a cyclist travels a distance of 4km from P to Q & then moves a distance of 3 km at right angle to PQ . Find displacement graphically
Tuesday, July 31, 2012 at 10:44am

Earth Science
I need help with the following Lab due tonight, 7/30/12, as I feel completely lost and would appreciate the help. The lab goes as follows: Design an experiment that illustrates the determination of the density of a cylindrical object found in the Lab Kit. Prepare a dynamic ...
Monday, July 30, 2012 at 4:22pm

Earth science
of the three "local winds" types discussed in the text book, which do you think could be most easily harnessed for the generation of electricity by a huge wind farm?
Sunday, July 29, 2012 at 8:41pm

Science
Find the [H+] in a 0.0255 M solution of HF if the Ka = 7.2 X 10^ -4
Sunday, July 29, 2012 at 7:44pm

science
a person moves 30m north, then 20m east and then 30(square root of two)m south west . His displacement from the original position is ?.
Sunday, July 29, 2012 at 11:05am

science
a canoe displaces 100 L of water weighs 9.8 NL what is the bouyant force on the canoe
Saturday, July 28, 2012 at 5:13pm

science
A mixture of {\rm NaCl} and {\rm NaBr} has a mass of 2.10{\rm g} and is found to contain 0.71{\rm g} of {\rm Na} What is the mass of {\rm NaBr} in the mixture?
Saturday, July 28, 2012 at 2:00pm

science
how make a hybridization of pcl5 with dygram
Saturday, July 28, 2012 at 9:16am

SCIENCE
chemical formula for Fe + ZnSO4
Saturday, July 28, 2012 at 8:06am

science
How many outlets can you place on one curcuit in your house
Friday, July 27, 2012 at 11:58am

Science , PLEASE HELP !
3 things that all life have in common and an explanation for the meaning of each?
Thursday, July 26, 2012 at 9:39pm

Science 10
The symbol of the lead(IV) ion is ?
Thursday, July 26, 2012 at 7:32pm

science
2 WAYS TO DETERMINE THE INTERIOR ARE GRAVITY, AND SEISMOLOGY.
Thursday, July 26, 2012 at 5:19pm

Science
How can we use Kepler's laws or Newton's laws to learn about these objects?
Thursday, July 26, 2012 at 5:18pm

physical science
what are the number of moles of phosphorus in 15 moles of Ca3(PO4)2
Thursday, July 26, 2012 at 10:41am

Science
You are a Chemical engineer, trying to synthesize N2H4(l). Your boss suggests that you try to synthesis it from the elements, nitrogen and hydrogen, at 25 celsius and 1.0 atm (since this would be a cheap way of doing it). Write a short note to sent to your boss which discusses...
Thursday, July 26, 2012 at 8:21am

Science
What is one way you could take action to reduce your carbon dioxide emissions?
Wednesday, July 25, 2012 at 11:39pm

science
what are atoms
Wednesday, July 25, 2012 at 7:59pm

science
To calculate the area of the front surface of a box you?
Wednesday, July 25, 2012 at 7:29pm

science
A shoe case weighing 40 lb is located on a scale inside a moving elevator that is going upward with the speed of 8 m/s. At time T1 elevator slows down with the acceleration of 3 m/s2 until the time T2. What are the the readings of the scale at T2 and T1 respectively?
Wednesday, July 25, 2012 at 6:33pm

physical science
A train sounding its horn is approaching an observer. The pitch of the horn's sound relative to its normal pitch is???
Wednesday, July 25, 2012 at 5:57pm

science
The solubility of sodium chloride is 36.0 g/100. ml of water, and the density of saturated NaCl solution is 1.202 g/mL.. I have 500. mL of a 1.00 M NaCl solution. If I boil it to the point of saturation, what is the final volume?
Wednesday, July 25, 2012 at 4:38pm

com 200
Kyle has struggled to feel comfortable in science classes with labs since his junior year of high school, when a solution he was working with ignited. He was always cautious with chemicals but his lab partner that year enjoyed seeing what would happen when he mixed random ...
Wednesday, July 25, 2012 at 3:05pm

science
A sample of air contains 32.7 µg/m3 of beryllium dust. How many atoms of beryllium are present in a room with dimensions of 8 feet by 13.6 feet by 15.6 feet? Answer in units of atoms
Tuesday, July 24, 2012 at 11:13pm

science
How many milliliters of 4.6 M HCl must be transfered from a reagent bottle to provide 16 g HCl for a reaction? Answer in units of mL
Tuesday, July 24, 2012 at 11:11pm

Science
A solution contains 0.01M ethyl acetate, 0.10M acetic acid and 0.10M ethanol. For the same equilibriujm constant of 2.00, calculate the equilibrium concentrations of ethyl acetate, ethanol, and acetic acid in the solution.
Tuesday, July 24, 2012 at 9:44pm

science
what shows that the sea water is a mixture and not a pure substance? a. it has a sharp boiling point b. it has definite composition c. it consist of a single phase d. the components lose their individual properties
Tuesday, July 24, 2012 at 8:07pm

science
Low water flows are a common problem for ecosystems in semi-urban streams. Should the suggestion of using domestic drinking water supplies to increase water flows in the streams be adopted?
Tuesday, July 24, 2012 at 2:40am

Science
Calculate the pH of an aqueous solution containing 1.3 * 10^-2 M HCl, 3.0 * 10^-2 M H2SO4, and 2.0 * 10^-2 M HCN.
Tuesday, July 24, 2012 at 2:13am

Science
You are a retired law enforcement officer who now teaches at a local community college in the criminal justice program. In addition to teaching ethics, you write crime novels on the side. You recently heard of a real-life case that you thought would make the basis for a good ...
Monday, July 23, 2012 at 8:19pm

science
how might the environmental impacts of deforestation and sprawl affect the human community of Pinchot
Monday, July 23, 2012 at 4:40pm

science-physics
a battery of 12v supplies a charge of 1000C to an electric device. how much work is done by the battery in moving the charge?
Monday, July 23, 2012 at 2:43pm

science -chemistry
Mr. Currie pours himself some coffee into a paper cup before making his way to the amusement park. The coffee temperature is 350C when the cup is placed on the kitchen counter with room temperature of 20o C. Mr. Currie was called to the phone for last minute arrangements, and ...
Monday, July 23, 2012 at 12:46pm

science
when a 424-g of iron powder is burned in an oxygen atmosphere, 0.606-g of a reddish brown oxide is obtained. Determine the empirical formula of the oxide.
Monday, July 23, 2012 at 7:01am

science
Two machines A and B produce respectively 60% and 40% of the total number of items of a factory. The percentages of defective output for A and B are 3% and 2% respectively. Suppose an item is selected at random, and is found to be defective. The probability that the item was ...
Monday, July 23, 2012 at 1:12am

science
A box contains 10 balls of which 6 are red (R) and 4 are white (W) . Three balls are taken from the box at random, one after the other. The probability that the 3 balls drawn are in the order RRW is equal to,
Sunday, July 22, 2012 at 11:47pm

Science
Define a day by the passage of the sun
Sunday, July 22, 2012 at 8:17pm

science
can the magnitude of the resultant of two vectors be smaller than the magnitude of either of them? Explain
Sunday, July 22, 2012 at 5:39pm

Computer science
As a member of the Information Security team at a small college, you have been made the project manager to install an access control system (ACS) in a dormitory. The ACS will automatically unlock the dormitory doors via an electronic proximity reader and integrate with an ...
Sunday, July 22, 2012 at 5:05pm

science
A radical skeptic might be willing to doubt which of the following
Sunday, July 22, 2012 at 5:02pm

environmental science
what are the sources of the following: carbon dioxide CO2 chlorofluorocarbons CFC's ground level ozone
Saturday, July 21, 2012 at 9:39pm

science
when you want to pull downward to lift something, the main advantage of passing a rope upward and through a single pulley, rather than just up over the branch of a tree, is that the pulley does what?
Saturday, July 21, 2012 at 8:10pm

Physical Science
A tire contains air at a pressure of 2.8 bar at 10C. If the tire’s volume is unchanged, what will the air pressure in it be when the tire warms up to 35C as the car is driven?
Saturday, July 21, 2012 at 7:16pm

science
what are sources of paper waste materials. Explain how paper waste materials affect biological diversity in the environment.
Saturday, July 21, 2012 at 6:54pm

science
need examples of solutions and suspensions
Saturday, July 21, 2012 at 2:56pm

Science
Describe each stage of the flow of information starting with DNA and ending with a trait? manifest - provide evidence for
Saturday, July 21, 2012 at 12:40pm

science
A car moving with constant acceleration covers the distance between two points 60 m apart in 6 seconds.Its speed point is 15 m/s.At what prior distance from the first point was the car at rest?
Saturday, July 21, 2012 at 11:39am

science
Im during a ppt. The questions are indentify the sources of paper waste materials. Explain how paper waste materials affect biological diversity in the environment.
Saturday, July 21, 2012 at 7:21am

science
solution of resultant displasement move toward 1.5m east then 2m south and then 4.5m toward east
Saturday, July 21, 2012 at 2:49am

Science
If oxygen, Carbon dioxide, and xenon gases are heated at 500k with a probable particle speed of 1094 and an average particle speed of 1234, what id the mass of an atom or molcule for each?
Friday, July 20, 2012 at 8:11am

science human nutrition
Write a 750- to 1,050-word paper that addresses the following points about the 3-day food intake information you recorded in iProfile: • Recorded intake of protein, carbohydrates, and lipids o Which foods in your recorded daily intake provide protein? Which provide ...
Thursday, July 19, 2012 at 9:12pm

science
how much work is done in bringing three electrons , which are intially a great disance apart to how fats will it be moving then it is at distance ?
Thursday, July 19, 2012 at 6:11am

science
an electorn is 20 ccom away from a fixed point charge , q =-0.250uc . if it starst to move from rest , then how fast will it be moving when it is a t distance ?
Thursday, July 19, 2012 at 6:07am

Science
container factory uses a 450 W motor to operate a conveyor belt that lifts containers from one floor to another. To lift 250 1-kg containers a vertical distance of 2.4 m, the motor runs for 45 s. What is the efficiency of the motorized conveyor system?
Wednesday, July 18, 2012 at 9:38pm

Science
A car's engine is only 12% efficient at converting chemical energy in gasoline into mechanical energy. If it takes 1.8 x 104 N of force to keep the car moving at a constant speed of 21 m/s, how much chemical energy would be needed to move the car a distance of 450 m at ...
Wednesday, July 18, 2012 at 8:07pm

science
10 name of acid and alkalies and there uses
Wednesday, July 18, 2012 at 12:56pm

sciences
i want to become amember of young scientist association in my school. But for this i must give an idea of any science project . Please help me
Wednesday, July 18, 2012 at 8:45am

science
Upton Chuck is riding the Giant Drop at Great America. If Upton free falls for 2.6 seconds, what will be his final velocity and how far will he fall?
Tuesday, July 17, 2012 at 8:08am

science
A pair of fair dice is tossed once. If the sum of the two numbers is greater than 9, the probability that one of the numbers is a 6 =
Tuesday, July 17, 2012 at 2:08am

physical science
a magnet connot be made by
Monday, July 16, 2012 at 11:14pm

Science
What fraction of the original activity of a radioactive substance will remain at the end of half-life?
Monday, July 16, 2012 at 4:50am

SCIENCE
A police man is driving a car with a speed of 30km/h,and firing a bullet having a speed of 150m/s towards another car which is moving ahead with a speed of 192km/f.At what speed will the bullet hit the car?
Monday, July 16, 2012 at 3:38am

English
I studied science last night. I had a good time with my family. I called Eunhui and talked for a long time. I took a shower in the bathroom. I made cheese cakes with my mother. I sent some e-mails to my friends. I bought a wallet at Home Plus. I read a newspaper. I listened to...
Monday, July 16, 2012 at 1:43am

Science
How do living organisms help purify water? Why will you get a smaller volume at the end of a experiment than what you started with? It is okay to taste your water at the end of an experiment? Why or why not?
Sunday, July 15, 2012 at 5:10pm

Science
A 4.0 x 101 kg wind sled is gliding East across a frozen lake at a constant speed of 12 m/s, when a gust of wind from the southwest exerts a constant force of 1.0 x 102 N on its sails for 3.0 s. With what velocity will the sled be moving after the wind has subsided?
Sunday, July 15, 2012 at 4:21pm

Science
A certain isotope has a half-life of 12 hrs. How long will it take for 100 ƒÝgr to decay into only 25 ƒÝgr?
Sunday, July 15, 2012 at 12:37pm

SCIENCE
DO YOU THINK ENOGH STEPS HAVE BEEN TAKEN TO REDUCE ERRORS IN MEDICAL ABBREVIATION USAGE?
Saturday, July 14, 2012 at 8:27am

physical science
What is the molecular mass of magnesium chloride,MgCl2?
Friday, July 13, 2012 at 7:47pm

science
A car is travelling at 80km/h in east direction , a train is travelling at 50 m/s in north direction then what is the combined velocity of car and train?
Friday, July 13, 2012 at 11:14am

science
why will it look blurry when you blow air into the limewater
Friday, July 13, 2012 at 6:15am

science
a rubber ball thrown at a height reaches the ground and keeps bouncing for sometime before coming to rest.
Friday, July 13, 2012 at 2:10am

Science
What is the volume of 19 grams of flourine gas at stp?
Thursday, July 12, 2012 at 5:41pm

SCIENCE
Explain the four factors that produce changes in population size.
Thursday, July 12, 2012 at 3:42pm

physical science
A person drives a car around a circular cloverleaf with a radius of 58 m at a uniform speed of 10 m/s. ) Compare this answer with the acceleration due to gravity as a percentage
Thursday, July 12, 2012 at 1:15pm

science(biology)
Difference between tendon and ligament
Thursday, July 12, 2012 at 7:09am

science
describe the efficiency of energy tranfer and how the amount of energy available at each trophic level affects the structure of the ecosystem>
Thursday, July 12, 2012 at 12:37am

science
A single mole of AgNO3 weighs 169.88 grams. In order to make a 1M solution, how many grams of AgNO3 would need to be dissolved in 1 liter?
Wednesday, July 11, 2012 at 4:30pm

Social science,please help!
How many countries are in the europe continent?
Tuesday, July 10, 2012 at 8:22pm

Principles of Management - Effective Management
Please double check my answers please! 1. a team manager is resolving the conflicts that exist among the members of his team in an organization. this is an example of: a. planning b. organizing c. leading d. controlling answer C 2. a manager at a grocery store is trying to ...
Tuesday, July 10, 2012 at 10:16am

science
is there any alloy which is equally dense with gold?
Monday, July 9, 2012 at 10:57am

Western Civilization/ Social Science
How has the two world wars, The Cold War and the Computer Revolution reduced the global economic clout of the Western European Atlantic powers and the U.S.
Monday, July 9, 2012 at 10:53am

science
two spheres carrying charge q are hanging from a same point of suspension with the help of threads of length 1 m in a space free from gravity . the distance between them is?
Monday, July 9, 2012 at 9:17am

Science
Considering the amount of energy required to produce animal-based foods and goods, should humans change their habits so they consume products closer to the bottom of the food chain because it is more efficient?
Sunday, July 8, 2012 at 8:18pm

environmental science
Although most salamanders have four legs, the aquatic salamander shown below resembles an eel. It lacks hind limbs and has very tiny forelimbs. Propose a hypothesis to explain how limbless salamanders evolved according to Darwin's theory of natural selection.
Sunday, July 8, 2012 at 7:42pm

Science
Table 1: Results of F1 Cross Observed Phenotypes of F2 Progeny # green plants = V # white plants = V Total # plants Petri Dish 1 > Petri Dish 2 > Total Observed Frequency of F2 Phenotype, Green:White = ______:______ Calculation of Observed Ratio (Frequency) = Total ...
Sunday, July 8, 2012 at 7:13pm

Science
2. If 320 F2 offspring resulted from this F1 cross, how many would be green? White?
Sunday, July 8, 2012 at 7:11pm

Science
According to science, the fastest speed posssible for anything is the speed of light. The speed of light is about 186,000 mies per second. That means taht in one minute, lighttravels 11,160,000 miles. The star nearest Earth is the Sun. It's about 93,000,000 miles from ...
Sunday, July 8, 2012 at 4:37pm

SCIENCE
A worker drags a box of mass 20 kg across a smooth floor by pulling a rope tied to
Sunday, July 8, 2012 at 7:18am

science
why does a wadded up foil sink
Saturday, July 7, 2012 at 5:51pm

science
I have an older furnace dryer which is used for drying copper ore, it operates at a temperature of 1000-to 2500 degrees F.I have low concentrations of hydrogen sulfide in the area.My question is can sulfur dioxide be produced without the ore present at these temperatures.
Saturday, July 7, 2012 at 2:00pm

science
What is the hydroxide-ion concentration of a 0.240 M oxalic acid, H2C2O4, solution? For oxalic acid, Ka1 = 5.6 × 10–2 and Ka2 = 5.1 × 10–5. 6)
Saturday, July 7, 2012 at 6:57am

science
step one of average pendulum was 38.0, 41.0, 35.0 period is 1.90 move bob back 15cm
Saturday, July 7, 2012 at 2:27am

Science
the inflexion is where the slope is constant. if the slope is positive (inccreasing as you pass a pole, what is the polarity (sign) of the pole?
Friday, July 6, 2012 at 11:27pm

Earth Science
Which of the following does NOT occur at a subduction zone? A. The leading edges of both plates are bent downward. B. Oceanic crust is pushed down into the mantle. C. One oceanic plate moves into another oceanic plate. D. One continental plate moves into an oceanic plate.
Friday, July 6, 2012 at 4:09pm

science
Which compound is formed when magnesium oxide combines with nitrogen gas?
Friday, July 6, 2012 at 11:50am

Science
science is the mixture ilearneed the science on the time she give my on fast day me is go for the killer and gave my juck on wag friends like the opportunity go as the preaper good life and good shade
Friday, July 6, 2012 at 8:22am

Dav nandraj:science
A man moves 3.5m towards east then he moves 2m in south then 4.5m towards east. Find its distance and displacement.
Friday, July 6, 2012 at 7:55am

Science
*How are pastes prepared? *How do pastes differ from ointments and creams? *Are pastes still prepared commercially? Why? *What are different components of medication ointment and ointment base that are prepared by fusion? Describe each of them. THANK YOU SO MUCH IN ADVANCE...
Friday, July 6, 2012 at 5:32am

science
How much force is needed to give a 5-kg box and upward acceleration of 2 m/s2?
Thursday, July 5, 2012 at 10:54pm

science
How fast must a fall be thrown upward to reach a height of 12 m?
Thursday, July 5, 2012 at 10:53pm

physical science
The acceleration of gravity on the surface of Venus is 8.9 m/s2. Would a ball thrown upward on Venus return to the ground sooner or later than a ball thrown upward with the same speed on the earth?
Thursday, July 5, 2012 at 10:52pm

physical science
. The brakes of a car are applied to give it an acceleration of -3 m/s2. The car comes to a stop in 5 s. What was its speed when the brakes were applied?
Thursday, July 5, 2012 at 10:52pm

physical science
. Three forces, each 10 lb, act on the same object. What is the maximum total force they can exert on the object? The minimum total force?
Thursday, July 5, 2012 at 10:51pm

physical science
A horse galloped a mile in 2 min 35s. What was its average speed in km/h?
Thursday, July 5, 2012 at 10:49pm

physical science
. A swimming pool is exactly 20m long, 7m wide, and 2m deep. What is its volume in cubic feet to 3 significant figures?
Thursday, July 5, 2012 at 10:48pm

science
The solubility of NaCl in water at 100 degrees celsius is 39.1 g/100 g water. Calculate the boiling point of this solution?
Thursday, July 5, 2012 at 10:08pm

science
What is the shape of the skin cells whose function is protection? A. Cube like with cilia B.flat and in layers C.spherical and fluid-filled D. Longcolumns in a single layer
Thursday, July 5, 2012 at 4:12pm

Foreign languages
Bob and Writeacher, I just wanted to inform you that my science project on water has been approved by the EU Commission. We'll be working on the project starting from September. (I will certainly need your help to work out a list of "scientific words" students ...
Thursday, July 5, 2012 at 1:55pm

science
Assuming that the cylinder is fixed at both ends and that its wall thickness is 7.5 mm, what force would be exerted by the cylinder during this change in temperature? (Note: the Young’s modulus for aluminium is 70 GPa.)
Thursday, July 5, 2012 at 7:34am

science
A hollow cylinder of aluminium 1 m long with a 40 mm outside diameter is at a temperature of 20 °C. What is the change in length and circumference of the cylinder when it is cooled to −25 °C? (Note: the thermal co-efficient of expansion of aluminium is 24 ×...
Thursday, July 5, 2012 at 7:33am

science
please help me in science i don`t now what is the answer of my assignment.dis is a question. 1.what are the main division of nervous system? 2.what are the organs of the central on nervous system? 3.what are the parts of the peripheral nervous system? thank you.
Wednesday, July 4, 2012 at 5:55am

Science
A 500g aluminum pot containing 250mL of water in the pot increases from 13.2 °C to 89.1 °C. Calculated the heat absorbed by the pot and water. I don't know the official approach to this question, somebody help!
Tuesday, July 3, 2012 at 5:43pm

science
Why do we have a leap year every four years?
Tuesday, July 3, 2012 at 3:14pm

physical science
what physical quantity does full glass water have over empty glass that cause it to resist change in motion over empty one?
Tuesday, July 3, 2012 at 11:59am

science
How does this work, I've been asking questions but no one ever answers
Tuesday, July 3, 2012 at 10:16am

SCIENCE
describe each stage of the flow of information starting with DNA and ending with traits
Tuesday, July 3, 2012 at 9:36am

science
if you ride a bike an average speed of 4km/h and need to travel a total distance of 28km how long will it take you to reach destination. show work
Tuesday, July 3, 2012 at 8:40am

science
describe each stage of the flow of information starting with DNA and ending with trait
Monday, July 2, 2012 at 11:25pm

research tech
which of the following is a primary source a. a newspaper article published in the 1980's that reports on an event in the 1880's c.a recently published history book that cites diaries and letters from the 1880's d.diaries and letters from the 1880's published ...
Monday, July 2, 2012 at 11:00pm

science
A subcompact car, mass 1,000 kg, runs into and sticks to an at-rest, 2,200 kg SUV. If their final speed is 4.7 m/s, what was the smaller car's initial speed?
Monday, July 2, 2012 at 7:55pm

science
Carbon-14 has a half-life of approximately 5,730 years. How many half-lives have occurred in a sample that contains 50 percent of the original amount of the parent isotope?
Monday, July 2, 2012 at 12:11pm

math
out of 100 students in a final examination of class 10, 70 passed in mathematics, 60 passed in science and 10 failed in both subject If 10 students absent find the number of students who passed both subject by using venn diagram
Monday, July 2, 2012 at 8:50am

Science
How much heat is necessary to change 30 g of ice at -20°C into water at 20°C?
Sunday, July 1, 2012 at 11:10pm

computer science
Can you help me break this into two clases, and Employee class and the default program class? I have to include a mutator and accessor method and provide properties for the instance variables. namespace commission { class Program { static void Main(string[] args) { decimal ...
Sunday, July 1, 2012 at 5:31pm

science
a person standing on a road has to hold his umbrella at 60 degree vertical to keep the rain away he throws the umbrella and starts running at 20 m/s he finds that rain drops are falling in him vertically. find the speed of the rain drops with respect to 1.the road 2.the moving...
Sunday, July 1, 2012 at 5:17am

science
a boat heading due north crosses a wide river with speed of 12km/h relative to the water the water in the river has a uniform speed of 5 km/h due east relative to the earth.determine the velocity of the boat relative to an observer standing on either bank and the direction of ...
Sunday, July 1, 2012 at 5:17am

science
a person walks up a stationary escalator in t1 second if he remains stationary on the escalator then it can take him up in t2 second if the length of the escalator is L,then 1.determine the speed of man with respect to escalator 2.determine the speed of escalator 3. how much ...
Sunday, July 1, 2012 at 5:11am

science
a particle is moving with a velocity of 5m/s .after 5sec it is found to be moving with velocity of 12 m/s in a direction perpendicular to the original direction.during these 5sec find 1.change in speed, 2.change in velocity and magnitude of change in velocity , 3.average ...
Sunday, July 1, 2012 at 5:05am

science
to prepare 500cm^3 of glucose solution of concerntration 1M. The chemical formula of glucose is C6H12O6.calculate (1)the relative molecular mass and molar mass.(2)the amount of glucose which will be in the solution.(3)the mass of glucose to be weighed
Sunday, July 1, 2012 at 5:04am

science
a man wishes to cross a river in a boat .if he crosses the river in minimum time then he takes 10min with a drift of 120 m .if he crosses the river taking shortest route,he takes 12.5min find the velocity of the boat with respect to water.
Sunday, July 1, 2012 at 4:57am

science
a hunter aims his gun and fires a bullet directly at a monkey in a tree. at the instant the bullet leaves the barrel of the gun,the monkey drops. will the bullet hit the monkey .substantiate your answer with proper reasoning.
Sunday, July 1, 2012 at 4:40am

science
two tall buildings are 200m apart .with what speed must a ball be thrown horizontally from the window 540 m above the ground in one building, so that it will enter a window 50m above the ground in the other?
Sunday, July 1, 2012 at 2:46am

physical science
what generally happens to atmospheric pressure on a windy day
Saturday, June 30, 2012 at 8:28pm

physical science
does a sunken ship sitting on the ocean floor have a buoyant force on it.
Saturday, June 30, 2012 at 8:26pm

science
how do inference help scientist in their discoveries?
Friday, June 29, 2012 at 10:54pm

science
what substance is being reduced in the following redox reaction? HgCl2 + Sn^2 = Sn^4 + Hg2Cl2 + Cl-
Friday, June 29, 2012 at 9:20pm

Science
1.The estimated doubling time for the black sea urchin population is approximately 1.5 years. What is the annual growth rate of the urchin? help please?
Friday, June 29, 2012 at 7:37pm

science
please give me 3 kinds of blood vessels
Friday, June 29, 2012 at 4:23am

physical science
a certain amount of water freezes and the resulting weight of the ice is
Thursday, June 28, 2012 at 10:57pm

science
a 6.85ohm light bulb is connected to a 12.0v battery. how much current flows through the bulb. how much power bulb consume
Thursday, June 28, 2012 at 10:50pm

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