Science

Recent Questions

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train with mass of 120mg accelerates uniformly on a horizontal track. The resistance to movement is 5N per kN of the mass of the train. The force in the draw-bar locomotive is 80kN Calculate a. The force required for constant speed b. The force that causes the acceleration c. ...

Science
1. What do bone marrow (the soft connective tissue that fills the internal spaces in bone) and the dermis (layer of the skin under the epidermis and over the hypodermis) have in common? (1 point) • They are both sites of new cell formation. • They both contain or are ...

science.......
An electric bulb is marked 220v60w. An ammeter in the circuit shows the bulb uses a current of 0.2727A. The bulb burns for an hour. Calculate the following: A. The electrical energy consumption B. The cost for the bulb to burn for one hour if the cost of electricity is 17.45 ...

Please help asap science
1. An electrical circuit consists of a battery with 2 cells,each with an EMF of 12 volts and an internal resistance of of 0.4 ohms,connected in parallel. An ammeter with an internal resistance of 0.15 ohms is connected in series with resistor Ra=2ohms and Rb=4ohms Calculate ...

science please help and explain asap
A train with mass of 120mg accelerates uniformly on a horizontal track. The resistance to movement is 5N per kN of the mass of the train. The force in the draw-bar locomotive is 80kN Calculate a. The force required for constant speed b. The force that causes the acceleration c...

science
A mixture of zinc and anhydrous zinc nitrate was heated in air, and its mass has not changed after this procedure. Calculate the mass frac-tions of the components in the mixture.

science 1 question
4. When a fan is turned on, it changes electrical energy into __________ energy. (1 point) motion magnetic gravitational*** electromagnetic

physical science
What is the amplitude of a longitudinal wave

science please help
1.a ball with a mass 2kg rests on an incline with an angle of 10 degrees. The ball is released to roll down the incline plane neglecting all friction: Determine the following: A.the loss in potential energy after it has rolled 12m. B.the velocity after it has rolled 12m. C.the...

science please help asap
1.a ball with a mass 2kg rests on an incline with an angle of 10 degrees. The ball is released to roll down the incline plane neglecting all friction: Determine the following: A.the loss in potential energy after it has rolled 12m. B.the velocity after it has rolled 12m. C.the...

Math
On Tuesday, Leslie spent 47 minutes on math homework, 39 minutes on science homework, 52 minutes on English homework, and 44 minutes on history homework. How much time did Leslie spend doing her homework on Tuesday?

Science
Which two elements represent the same family of the periodic table? Hydrogen Helium Lithium Fluorine Is it none??

Science
what is an isotope

Science
H2) -----> H^+ + OH^- Is this equation balanced

Science
what are some challenges to biodiversity

Science
I really need help with my science which is based on Galileo Galilei. I need information about his early life,education, his fun facts, his contributions,and how his contributions affect us. i got some information but i need help finding proper info. thanks

science please help asap
1.a train with a mass of 120mg accelerates uniformly on a horizontal track. The resistance to movement is 5N per kN of the mass of the train. The force in the draw bar of the locomotive is 80kN. Calculate A.The force required for the constant speed. B. The force that causes ...

science
1.a ball with a mass 2kg rests on an incline with an angle of 10 degrees. The ball is released to roll down the incline plane neglecting all friction: Determine the following: A.the loss in potential energy after it has rolled 12m. B.the velocity after it has rolled 12m. C.the...

science
100mL of oxalic acid (H2C2O4) requires 35mL of 0.04M KMnO4 to titrate it to the endpoint. calculate the molarity of the oxalic acid.

science
When the metal sample reacts with acid, the gas evolved will be collected over water; the gas is said to be "wet". What is the composition of the wet gas? How can the partial pressure of hydrogen be obtained from the total pressure of wet gas? From where will you obtain the ...

science
The solubility of sugar in water in room temperature is 204 g/ 100 ml. a) How much sugar will dissolve in 100 ml of water at room temperature? b) How much sugar will dissolve in 200 ml of water at room temperature?

science
The solubility of sugar in water in room temperature is 204 g/ 100 ml. a) How much sugar will dissolve in 100 ml of water at room temperature? b) How much sugar will dissolve in 200 ml of water at room temperature?

Science
Who have made god

Science
How much work do you do when you push a shopping cart with a force of 50N for a distance of 5M

science
The analysis of lead (Pb) in a sample of solder was carried out using atomic absorption spectroscopy as follows. 1.013 g of solder was completely dissolved in a small volume of nitric acid and the solution made up to 1.000 L with distilled water. A 50.0 μL aliquot of this...

Physical Science
A model electric train requires 12 V to operate. When connected to a household voltage of 120 V, a transformer is needed. If the primary coil has 500 turns, how many turns must the secondary coil have?

science
I have a science experiment and I'm not sure how to do this or have all the materials to do it can anyone help? For this portfolio, you will design an experiment to investigate the relationship between the number of coil loops and a strength of a solenoid. Once you have an ...

science
how is a parameter related to designing an experiment?

Life science,agric science,geography,history,maths
I'm doing these subjects and my career is to be a dectective,so now I just want to know regarding coarses.

6th Grade Science
Hi, I really need help and I'm really confused I don't know what they are asking me to do. Provide three statements that demonstrate the importance of units when describing motion. Please someone help me because it is very important. Thank You :/

Science
State how matter moves through the biosphere. State how energy moves through the biosphere. Explain each statement using examples to illustrate your explanation.

Science
What is the effect of the slope of an incline of a surface on an object’s speed?” PLEASE do not answer...I just need help understanding it. Thank You

Math, Science
A woman throws a 0.25 kg ball straight up in the air with a initial speed of 15 meters per second. how far above the woman will the ball go before it starts coming back down?

science
graduated cylinders are not as precisely calibrated as are burets or volumetric pipets. briefly explain why it is acceptable to measure KI and HCl solutions in the titration with graduated cylinders rather than with pipets or burets.

Science
Which statement describes the relationship among the sun wing and ocean currents A. The sun heats the ocean surface causing water to evaporate producing wind currents B.The sun heats earth unequally cuaing winds that drive ocean surface currents C.The sun heats the air and the...

Science
what determines the movement of global winds

career help
one year ago This degree program is designed to prepare students to enter a career upon completing the degree with no further study required. Some are transferable to a state university program to continue education. Associate in Arts (AA) Associate in Science (AS) Associate ...

Science
1. A weatherman reports, "the storm waves are about 2 meters high and about 35 meters apart. "what properties of waves is the reporter describing? Frequency and wavelength Wavelength and wave speed***** Amplitude and wavelength Amplitude and frequency 2. Sound proof rooms take...

Science
Portfolio: you will design an experiment to investigate the relationship between the number of cool loops and the strength of a solenoid. Once you have an experiment plan carry out your experiment and record your data. After you have finished conducting the experiment, write a...

science
a racer in a kayak travels a 300-meter river course at an average speed of 3 meters per second. how long does it take to complete the course?

science help.. pls help me dr.bob22 or damon
Sodium Chloride is formed when atoms lose and gain electrons Carbon monoxide is formed when atoms share electrons. In both substances atoms are held together by a(n) is it chemical bond pls help me

science help.. pls help me dr.bob22 or damon
In a water molecule, 2 atoms of hydrogen and 1 atom of oxygen share electrons. A _______ bond, is found in water molecule is it chemical bond pls help me

science help.. pls help me dr.bob22 or damon
Dalton's ideas that atoms cannot be divided into smaller parts was disproved by the discovery of the_____ is it electrons

science help.. pls help me dr.bob22
A metal from group 1 and a nonmetal from group 17 are? A. Not likely to bond B. Likely to form a covalent bond C. Likely to form a ionic bond D. Likely to form a metalloid is it c pls help me pls help me

pls help me dr.bob22 science
Which of the following demonstrates that reactants and products are chemically different? A.Zn + 2HC1 = 2HCl + Zn B. Zn 2HCl = H2 + 2 nCl2 C. H20 + C4H10 = H20 + C4H10 D. C4H10+ H20= C4H10 +H20 is it b pls help me

pls help me dr.bob22 science
Which of the following would likely be part of an ionic bond? Choose all that apply. *K+1 *Cl2 *F-1 *Ne is it a and b

science help check
3. A metal from group 1 and a nonmetal from group 17 are? A. Not likely to bond B. Likely to form a covalent bond C. Likely to form a ionic bond D. Likely to form a metalloid is it c pls help me

science help
How can you describe the location of hafnium (Hf, atomic number 72) on the periodic table? choose all that apply. -Transition metals -noble gases -group 6, period 4 -group 4, period 6 pls help me damon or ms sue pls help me pls pls pls

science
a life cycle in which organisms switch back and forth between diploid and haploid stages

science
The alleles for brown eyes (B) are dominant, while those for blue eyes (b) are recessive. If Lesley’s mother has the genotype BB and her father has the genotype bb, what is Lesley’s genotype? What is her phenotype?

science PLZ HELP
electric charges that are different A) attract each other B) repel each other C) exist in pairs D) do not interact Magnetic field lines around a bar magnet A) are only perpendicular to the magnet B) spread out from one pole and curve around the other C) cross back and forth ...

Science
What is the concentration of NH3 in 0.250M solution of NH4Cl?

Physics
Which best explains why openness is important to the progress of science?

Physical science
A 478.18g ice cube is taken out of the freezer at -8.5 degrees Celsius. how much heat s needed to turn it in to steam?

science
How many moles of li2so4 is required to prepare 300ml of a 0.5 m solution

science
find the velocity with which it hits the ground when a body is projected horizontally from top of a tower 100 meter high with a velocity of 9.8 meter per second.

Science help please!!
How did planetesmals form planets? A. They broke apart into smaller chunks. B. They collided and stuck together. C. They cooled and pulled ice together. D. They began to rotate. Is the answer B? Thank you so much in advance.

7th grade math (probability)
I'm not sure how to answer this: 3. THe 7th grade wants to have a back-up representative just in case the first teacher is absent. Based on the same scenario as #2, if a math teacher was chosen to be the 7th grade representative, what is the probablility that the back-up drawn...

science help
a metal from group 1 and a nonmetal from group 17 are 1.) not likely to bond 2.) likely to form a covalent bond 3.) likely to form an ionic bond 4.) likely to form a metalloid is it 3 pls help me

science help
How can you describe the location of hafnium (Hf, atomic number 72) on the periodic table? choose all that apply. -Transition metals -noble gases -group 6, period 4 -group 4, period 6 pls help me damon or ms sue

science help
How many valence electrons does an atom of rubidium (Rb atomic number 37) have? A.One B.Five C.Six D.37 is it a pls help me ms sue or damon or anybody

Physical Science
A man loads 1,000 sacks of flour into a truck in 30 minutes. each sack has a mass of 20 kg and the man must lift each sack 1.00 m from a cart up onto the truck bed. How much power did the man develop?

science help
Which process of the carbon cycle is responsible for the release of carbon at the power plant, as shown by the arrow? combustion. photosynthesis. digestion. decomposition. 941080532013105759am498923097.jpg copy and paste this and you will see the picture.. look it up at google...

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? pls help me

science help
Hydrogen gas(H2) and chlorine gas(CL2) react to form hydrochloric acid (HCI). What is the correct balanced chemical equation for this reaction? is it H2 + Cl2 = 2HCl

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 ...

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...

Science
How many chemical reactions are possible regarding the formation of carbonic acid and the dissolving of calcite? A. 3 B. 23 C. 2 D. 10 I think its A.??

goegraphy,agriculture,life science and maths liter
Which career can I take with this subjects?

science
What is the momentum of a two-particle sys- tem composed of a 1300 kg car moving east at 60 m/s and a second 1500 kg car moving west at 95 m/s? Let east be the positive direction. Answer in units of kg · m/s.

Computer science C++
A problem in timber management is to determine how much of an area to leave uncut so that the harvested area is reforested in a certain period. It is assumed the reforestation takes place at a known rate per year, depending on climate and soil conditions. A reforestation ...

Physical science
I Don't UnderThis . It Says V=55mph D=68mi T=?

Science NOT A QUIZ
1. __________ is/are NOT an angiosperm because it does not _______. (1 point) Barley; produce fruit Wheat; produce seeds* Lentils; produce cones Ginkgoes; flower 3. The leaves of plants ____, while the roots of plants _____. (1 point) make food; store ...

Science Check Thank You
1. __________ is/are NOT an angiosperm because it does not _______. (1 point) Barley; produce fruit Wheat; produce seeds* Lentils; produce cones Ginkgoes; flower 3. The leaves of plants ____, while the roots of plants _____. (1 point) make food; store ...

Earth Space Science
the horizontal distance between a crest to the next trough of an ocean wave is 5 meters. what is the wavelength of the ocean wave? A)2 meters B)5 meters C)10 meters D)20 meters I think its 10 meters but im not so sure, I would like to make sure.

Science
which of these statements provides evidence to the fact that oceans influence climate by transporting water from one place to another? A)warm ocean water off the east coast of Florida affects the climate of Europe. B)warm ocean water off the east coast of Florida affects the ...

Science Please Help Me 2
2. Ferns are the most abundant of the _____ plants; and they produce _______ to reproduce. gymnosperm; sperm seedless vascular; spores* nonvascular; shoots vascular; seeds 3. Which of the following is a reason mosses never grow very tall? lack of cell ...

Science Check Please
Which of these is true? The nervous system doesn't react as quickly as the endocrine system. The endocrine system doesn't react as quickly as the nervous system. (My Answer) The nervous system and the endocrine system have similar reaction times. The endocrine system and the ...

science
If a car has a constant acceleration of 4 m/s², starting from rest, how far has it travelled by the time it reaches the speed of 40 m/s?

science
I posted this under science because I see it occurring most under this subject. Many of the tutors here are very rude and useless at times. Honestly, if kids are on the internet seeking help for questions on their homework or whatever, they aren't going to suddenly know the ...

math
75 pupils sat for a Science Test. The average score was 58 marks. If the average score of the girls was 62 marks and the average score of the boys was 56 marks, how many boys sat for the test?

Science
Salinity of the ocean A)is generally very low B)changes with climate C)decreases with increase in temperature D)increases where a river meets the ocean I think its A but I'm not sure I just want to make sure.

science
A golfer tees off and hits a golf ball at a speed of 31 m/s and at an angle of 35 degrees. How long was the ball in the air? Round the answer to the nearest tenth of a second.

physical science
a parachutist jumps from an aeroplane.he has a mass of 80kg.initially,he 'free-falls',before his parachute opens.what is his initial acceleration

Science
When the energy of a sound wave is transferred to a particle of a medium and causes it to vibrate and generate heat, the sound wave is......

Science
I need to write 10 sentences to this question: what do u think caused the little puddle of water to appear under the syringe! Please help to find 10 sentences on what caused the puddle

science
If 23 g of ethanol (c2h5oh) is dissolved in 60 g of ethenoic acid (ch3cooh). Then find out the mole fraction of each component?

Science
10. You analyze the gas in 100 kg of gas in a tank at atmospheric pressure, and find the Following : CO2;19.3%, N2;72.1%, O2;6.5%, H2O;2.1% What is the average molecular weight of the gas?

Science
A cellulose solution contains 5% cellulose by weight in water. It is to be diluted to 4.0 % using a 1% solution of cellulose in water. Determine the kilograms of 1% solution required to dilute 100 kg of the 5% solution.

Science
Find the density and specific gravity of the following (a) SO2 at 700F and 1 atm (b) Mixture of 10 mole% CH4 and 90 mole% argon at 5400C and 28.9 inch Hg (c) Air containing 0.045 lbm H2O per pound mass of dry air at 2000F and 29.7 in Hg absolute pressure

Science
The pressure guage on the steam condenser for a turbine indicates 26.2 in. Hg of vacuum. The barometer reading is 30.4 in. What the absolute pressure in the condenser in psia?

Science
1 kg of Nitrogen is mixed with 3.5 m3 of hydrogen at 300 K and 101.3 kPa and sent to ammonia converter. The product leaving the converted analyzed 13.7% ammonia, 70.32% hydrogen and 15.98% nitrogen. (a) Identify the limiting reactant? (b) What is the percent excess of the ...

Science
A Portland cement sample contained 20% SiO2 by weight derived from two silicate compounds. SiO2.2 CaO and SiO2. 3CaO that are present in the cement in the mole ratio 3:4. Determine the percent by weight of each silicate compound in the cement.

Science
A basketball is dropped from a height of 2m and has a rebound of only 1.5m. what happened to that energy that was lost?

reading and literature
which is hamlet by Shakespeare historical fiction, mystery, myth, science fiction, realistic fiction, allegory, parody, satire, or graphic novel.im thinking graphic novels

Computer science
How to convert from decimal to binary in matlab.....this is what I have so far..... dec = 43; i = 1; sum=0; while dec>0 r = rem(dec, 2); sum=sum+(i*rem); dec=dec/2; i=i*10; end sum

Science, genetics
Two pea plants are crossed. One is homozygous recessive for long (long is dominant and short is recessive) and the other is heterozygous. If 100 pea plant offspring are produced, how many of them will be long?

Earth science
how does the temperature of ocean currents affect climate?

Science
Meteoroids can form when comets break apart, creating dust clouds. True or False? I think it's true.

Physical Science
Calculate: In the following equation, 417.96 g of Bi (bismuth) reacts completely with 200 g of F (fluorine.) How many grams of BiF (little three below F) are formed? 2 Bi + 3 F (little 2 under F) ---> 2 BiF (little three below F)

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