Thursday
July 2, 2015

Homework Help: Science

Branches of Science

Recent Science Questions

science
A light spring is initially used to suspend masses from the ceiling. When a 4.0 kg mass is attached to the spring, its length is 22.0 cm. When an additional 2.3 kg mass is attached to the bottom of the 4.0 kg mass, the spring's length measures 26.8 cm. Determine the ...
Sunday, April 12, 2015 by hloni

Science
A block of weight 7.0N rest on a level floor. The frictional force between the block and the floor is 1.0N, A horizontal force of 1.4N is used to pull the block for 4s.what is the velocity of the block after this time?
Saturday, April 11, 2015 by Olushola

science
If the half life- period of a radioactive element is 1600.After how many years will if remains 25% of his quantity
Saturday, April 11, 2015 by Prince

biology/science
What are the biological terms for the following 1.process in biotechnology that is used to make human insulin in a bacterial cell 2.white blood cells produce antibodies in response to pathogens
Saturday, April 11, 2015 by morongwa

science
Fossil fuels are a. A natural resource b. Renewable c. Made from minerals d. Burned in hydroelectric plants
Friday, April 10, 2015 by banny

life science
give the biological term for the following 1.process in biotechnology that is used to make human insulin in a bacterial cell 2.white blood cells produce antibodies in response to pathogens
Friday, April 10, 2015 by lesedi

science plz help ms sue
Compare and contrast spiral and elliptical galaxies. (Make at least 2 comparisons.) plz help me with eclest what is to comparisons
Friday, April 10, 2015 by help plz

Science
Provide three statements that demonstrate the importance of units when describing motion. Please help and thank you!! asap Ms.Sue?
Friday, April 10, 2015 by Channy-Boo

science ms sue plz help
1. Which layer of the sun's atmosphere are you looking at when you look at an image of a sun? A) Photosphere B) Chromosphere C) Corona D) Prominence 2. What materials could have been found in a giant cloud that formed the solar system? A- hydrogen and helium B- hydrogen ...
Friday, April 10, 2015 by need help plz

Science
A 45 N force is applied to a 9.6 kg object, what is it's acceleration?
Friday, April 10, 2015 by Josh

Science
Why do people debate on fossil fuels? Is it based on how its used? Thanks
Thursday, April 9, 2015 by Sarah

science
What does composition mean when you're talking about biotic and abiotic
Thursday, April 9, 2015 by thi

science
What are some biotic items we do at home.. I only have the abiotic side.
Thursday, April 9, 2015 by thi

science
Is a laptop biotic or abiotic?
Thursday, April 9, 2015 by thi

Earth Science
Which of the following are you most likely to experience a-total solar eclipse b-total lunar eclipse c-full moon d-partial lunar eclipse? my answer is full moon
Thursday, April 9, 2015 by Steve

science
From the cosmic background radiation, what can scientists infer that the universe was like after the big bang? A. Very small B. Hot C. The same average temperature as it is today. D. Cooler than it is today. Is the answer C? Thank you for the help😊
Thursday, April 9, 2015 by Kanani

science
Flight simulators are used to train new pilots because ____.
Thursday, April 9, 2015 by mack

science
An illness caused by a protist is? protozoa is my answer i think is it right?
Thursday, April 9, 2015 by vector

science
An illness caused by a protist is protozoa? True or False My answer is true am i correct?
Thursday, April 9, 2015 by Visa

science
A protostar has a high enough ___ to become a star. A. Volume B. Mass C. Temperature D. Brightness Is the answer B? Thank you
Thursday, April 9, 2015 by Kanani

science
Which of the following is s major difference between elliptical galaxies and spiral galaxies? A. Elliptical galaxies have almost no gas or dust between starts. B. Elliptical galaxies vary more in shape than spiral galaxies. C. Spiral galaxies have almost no gas or dust between...
Thursday, April 9, 2015 by Kanani

science
Why can certain stars sometimes be identified as eclipsing binary stars? A. They are brighter than any single star. B. They are all white dwarfs C. They become dimmer at regular intervals. D. They are cool red stars. Is the answer C?
Thursday, April 9, 2015 by Kanani

science
A protostar has a high enough___to become a star. A. volume B. mass C. temperature D. brightness Is the answer B? Thanks in advance
Thursday, April 9, 2015 by Katy

Science
18. The human immune system produces ______________ in response to a vaccine, which later can bind to and destroy a pathogen if it invades. (1 point)
Wednesday, April 8, 2015 by Charity

science
how many seconds does it take for Mercury to go from 0 degrees Celsius to 300 degrees Celsius? 1. 5 seconds 2. 10 seconds 3. 30 seconds 4. 357 seconds
Wednesday, April 8, 2015 by Kim

Science
When you make a pedigree and it says Theos wife Mary is a purebred right-handed person what does purebred mean
Wednesday, April 8, 2015 by Anonymous

science
Given the following reaction (it IS balanced), how many grams of CO2 are produced when 0.700 moles of toluene (C7H8) is allowed to completely combust? C7H8 + 9 O2 ¨ 7 CO2 + 4 H2O
Wednesday, April 8, 2015 by Linzie

Science
If a full moon occurred on April 1, what phase would you see on the 7th, 21st,4th,30th,and 14th of April
Wednesday, April 8, 2015 by M

Science
In the ocean, there are area's where there are very few living things. _______ is the term that when this happens to a natural area.
Wednesday, April 8, 2015 by Jojo

Science plz help :)
It's winter where Jenna lives. It's been snowing all day, but now the snow has changed to sleet and then to freezing rain. What is happening to cause these changes? In your answer, explain how snow, sleet, and freezing rain form.
Wednesday, April 8, 2015 by Fairypenguingirl

Physical Science heat & temp. Chapter
How much heat in calories is required for (2.7 lb) of ice –200 F to be converted to water at 40 F?
Wednesday, April 8, 2015 by Melissa

science (chemistry)
why does the pH of the acid solution initially increase very slowly when metal is first added to the acid solution, but gradually increase at a faster rate as the reaction proceeds to completion? I thought it may be because the metal is just then being completely dissolved but...
Wednesday, April 8, 2015 by brittany

plz help science
1. Which layer of the sun's atmosphere are you looking at when you look at an image of a sun? A) Photosphere B) Chromosphere C) Corona D) Prominence 2. What materials could have been found in a giant cloud that formed the solar system? A- hydrogen and helium B- hydrogen ...
Wednesday, April 8, 2015 by bmx

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 ...
Wednesday, April 8, 2015 by Hailee

science
1. What do bone marrow and the epidermis have in common? A. They are both sites of new cell formation. B. They both contain structures that assist the body in cooling down if overheating occurs. C. They both contain or are associated with sensory neurons. D.They are both ...
Wednesday, April 8, 2015 by jay

science
How to calculate the mass of 17 ml of 2 mole of sulfuric acid?
Wednesday, April 8, 2015 by wilbard

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 kinetic energy C.the velocity after it...
Tuesday, April 7, 2015 by Buhle

engineering science n3
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: 1.the force required for the constant speed. 2.the force that causes the ...
Tuesday, April 7, 2015 by tuis

Science
What kind of energy is transferred in an energy pyramid
Tuesday, April 7, 2015 by M

science
these are all very confusing for me 1. Explain why Earth and other planets were not solid when they formed during the beginning of the Precambrian, approximately 4,600 million years ago (MYA). What was this particular time period called, and why is this time period not really ...
Tuesday, April 7, 2015 by kat101

Science(need help)
1) What evidence is there that the human species has been successful so far? Explain. 2) What environmental pressures in the past do you think were most important in shaping the human species as it exists today? 3) What environmental pressures exist now that you think may be ...
Tuesday, April 7, 2015 by vivis

Science
How much current does a flashlight use if its battery supplies 3.0 Volt and the bulb has a resistance of 4.0 Alpha
Tuesday, April 7, 2015 by Kyle

science.......,,....
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. ...
Tuesday, April 7, 2015 by aneleeeee

Science
What do bone marrow and the epidermis have in common? A) They are both sites of new cell formation B) They both contain structures that assist the body in cooling down if overheating occurs C) They both contain or are associated with sensory neurons D) They are both involved ...
Tuesday, April 7, 2015 by Kayla

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...
Tuesday, April 7, 2015 by Kiara

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 ...
Tuesday, April 7, 2015 by owamiii

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 ...
Tuesday, April 7, 2015 by Sarah

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...
Tuesday, April 7, 2015 by Buhle

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.
Tuesday, April 7, 2015 by odwa nkqwiliso

science 1 question
4. When a fan is turned on, it changes electrical energy into __________ energy. (1 point) motion magnetic gravitational*** electromagnetic
Monday, April 6, 2015 by Linda

phisical science
What is the amplitude of a longitudinal wave
Monday, April 6, 2015 by justin

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...
Monday, April 6, 2015 by Buhle

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...
Monday, April 6, 2015 by Bettina

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?
Monday, April 6, 2015 by Maddie

Science
Which two elements represent the same family of the periodic table? Hydrogen Helium Lithium Fluorine Is it none??
Monday, April 6, 2015 by M

Science
what is an isotope
Monday, April 6, 2015 by M

Science
H2) -----> H^+ + OH^- Is this equation balanced
Monday, April 6, 2015 by M

Science
what are some challenges to biodiversity
Monday, April 6, 2015 by Help

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
Monday, April 6, 2015 by Albert Einstein

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 ...
Monday, April 6, 2015 by Bettina

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...
Monday, April 6, 2015 by Buhle

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.
Monday, April 6, 2015 by aisha

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 ...
Sunday, April 5, 2015 by anonymous

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?
Sunday, April 5, 2015 by parneet

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?
Sunday, April 5, 2015 by parneet

Science
Who have made god
Sunday, April 5, 2015 by Aayu

Science
How much work do you do when you push a shopping cart with a force of 50N for a distance of 5M
Saturday, April 4, 2015 by Leana

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...
Saturday, April 4, 2015 by Tasha

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?
Saturday, April 4, 2015 by Melvin

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...
Friday, April 3, 2015 by Amber

science
how is a parameter related to designing an experiment?
Thursday, April 2, 2015 by haylee

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.
Thursday, April 2, 2015 by YANDISA GILO

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 :/
Thursday, April 2, 2015 by MusicLover14

Science
State how matter moves through the biosphere. State how energy moves through the biosphere. Explain each statement using examples to illustrate your explanation.
Thursday, April 2, 2015 by Anonymous

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
Thursday, April 2, 2015 by Jordan

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?
Thursday, April 2, 2015 by Wyatt Bendickson

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.
Wednesday, April 1, 2015 by gladys

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...
Wednesday, April 1, 2015 by M

Science
what determines the movement of global winds
Wednesday, April 1, 2015 by M

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 ...
Wednesday, April 1, 2015 by Oscar

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 ...
Wednesday, April 1, 2015 by Hailee

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...
Wednesday, April 1, 2015 by Melody

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?
Tuesday, March 31, 2015 by Anonymous

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
Tuesday, March 31, 2015 by Oscar

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
Tuesday, March 31, 2015 by Oscar

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
Tuesday, March 31, 2015 by Oscar

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
Tuesday, March 31, 2015 by Oscar

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
Tuesday, March 31, 2015 by Oscar

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
Tuesday, March 31, 2015 by Oscar

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
Tuesday, March 31, 2015 by Oscar

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
Tuesday, March 31, 2015 by Oscar

science
a life cycle in which organisms switch back and forth between diploid and haploid stages
Tuesday, March 31, 2015 by miya

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?
Tuesday, March 31, 2015 by james

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 ...
Tuesday, March 31, 2015 by Anonymous

Science
What is the concentration of NH3 in 0.250M solution of NH4Cl?
Tuesday, March 31, 2015 by Jeet shah

Physics
Which best explains why openness is important to the progress of science?
Tuesday, March 31, 2015 by JaQua

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?
Tuesday, March 31, 2015 by Millie

science
How many moles of li2so4 is required to prepare 300ml of a 0.5 m solution
Tuesday, March 31, 2015 by ernstcia

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.
Tuesday, March 31, 2015 by avinash

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.
Monday, March 30, 2015 by Katty

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