Monday
May 30, 2016

Homework Help: Science

Branches of Science

Recent Science Questions

physcial science
What type of current is produced by a battery? A. parallel current B. alternating current C. direct current D. potential current
Tuesday, October 20, 2015 by sid

physcial science
The type of current in your home is mostly A. direct current. B. alternating current. C. series current. D. produced by batteries.
Tuesday, October 20, 2015 by sid

Science
1.)Studies conducted in england during the industrial revolution have shown that children born to poor families were, on average, shorter than those born to wealthier parents. The most likely expalanation for this difference in hieghts is a difference in A.)Nutrition B.)Family...
Tuesday, October 20, 2015 by Douglas

Science
Compute the number of grams if there are 10.7g of c2h6 in complete combustion
Tuesday, October 20, 2015 by Alex

Science
The speed of a motorcycle increases from 10.0 km/hr to 50.0 km/hr in 9.0 seconds. What is the acceleration?
Monday, October 19, 2015 by Paul

Science
What is the average for 4cm 5cm and 5cm
Monday, October 19, 2015 by William

science
A solid spherical ball rolls on table. Ration of its rotational kinetic energy to its total kinetic energy.
Monday, October 19, 2015 by lalit rawat

science
Which of the following is an example of inbreeding? A) a farmer chooses the cos in his or her herd that produce he most milk and breeds only those cows. b) a farmer chooses the cows in his or herd that produces the most milk and breeds them with cows that get sick less often. ...
Monday, October 19, 2015 by Ana

science
Studies conducted in England during the industrial revolution have shown that children born to poor families were, on average, shorter than those born to wealthier parents. The most likely explanation for this difference in height is a difference in A) nutrition b) family size...
Monday, October 19, 2015 by Ana

Science
What is the difference between the density of cold water and the density of hot water.. Explain using the particle theory of matter. Thank You......
Monday, October 19, 2015 by Dj

SS HELP PLZ
Which statement describes the thinking of the enlightenment? A. The power of reason is more important. B. Scientific ideas must fit religious beliefs. C. Only god knows how the world works. D. Faith is more important than science plz help
Monday, October 19, 2015 by anonymous

Science
Which of the following factors does not vary between a fast-following river and a pond that receives no water input? a. oxygen levels b. salt concentration*** c. temperature d. fish species Plzzz help me:)
Monday, October 19, 2015 by Labbayk

phPhysical Science
A bird flew16 km west in 5 hours, then flew 20 km east in 6 hours. What was the bird’s velocity?
Monday, October 19, 2015 by doris

Geo, Math lit, Life science, history
Which career will I be able to do if I study Geography, Mathematical literacy, Life sciences, History, English, setswana and life orientation
Monday, October 19, 2015 by Destiny

science
A circular hole of 150 mm diameter is to be punch out of a 2 mm thick plate. the shear stress needed to cause fracture is 400 Mpa. calculate the minimum force to be applied to the punch.
Monday, October 19, 2015 by Hassan

Statistics
At a certain university, 50% of all entering freshmen planned to major in a STEM (science, technology, engineering, mathematics) discipline. A sample of 36 freshmen is selected. What is the probability that the proportion of freshmen in the sample is between 0.475 and 0.580? ...
Sunday, October 18, 2015 by Obi

Science
Which has a higher gravitational potential energy a mango or a huge boulder falling from the same height with the same acceleration due to gravity
Sunday, October 18, 2015 by Shevel

8th Grade Science
How do adaptations enable organisms to reduce competion for food and other resources PLEASE ANSWER BY 4 (50 MINS)
Sunday, October 18, 2015 by Christina

barberton tvet ,science
calculate the maximum height reached by the bullet
Sunday, October 18, 2015 by sipho

gaya ,college science
Which one of the following is an alkaline earth element? a) carbon b)sodium c)zinc d)iron
Sunday, October 18, 2015 by gaurav verma

science
a bullet leaves a rifle with a velocity of 200m/sec and strikes targt up to 4cm what velocity scould it have pierce the same block of wood up to 16cm?
Sunday, October 18, 2015 by infant

Health science
Make lists of factors that makes your lives stressful and explain how each impacts your physical health and fitness. Please help I'm confused
Saturday, October 17, 2015 by Sara

Science
A block of mass m is placed on a triangular block of mass M Which in turn Placed on a horizontal frictionless Surface find the velocity of the triangular block when the smaller block reaches the bottom end
Saturday, October 17, 2015 by Shubhrajeet Mondal

Science
1. True or False: If the net force of an object is 0 N, the forces are considered unbalanced. (True) 2. Which of the following forces causes a feather to fall slower than a blowing ball? gravity © rolling friction sliding friction air resistance 3. A small fish in ...
Saturday, October 17, 2015 by Halie

science
For the monatonic gas in #3,estimate the momentum of the gas for a particle mass of 3x10^-4g
Saturday, October 17, 2015 by gift

Science
Kendell wants to determine if there is a trend in air temperature changes during April. Which procedure should he follow?
Friday, October 16, 2015 by gina

science
I have a question from an old exam that I need help to understand, i'm not sure where to start An electron in an electronically excited hydrogen atom undergoes a transition from a 6d to a 2p orbital, resulting in the emission of a photon. The photon strikes a metal surface...
Friday, October 16, 2015 by alyssa

science
Which of the following is the key factor driving cellular differentiation in the body? a. chemical gradients in the cellular environment b. expression of genetic coding c. rate of transcription d. cellular nutritional status B or C?
Friday, October 16, 2015 by tim

science
In evolutionary terms, RNA is thought to have preceded proteins and DNA. Which of the following provides the most convincing support for this hypothesis? a. there are more types of RNA than there are of DNA b. RNA can both store genetic information and act as an enzyme c. ...
Friday, October 16, 2015 by tim

life science
Using examples,describe predation,competition and symbiosis,explaining how each interaction influences the population size of the organisms involed.
Friday, October 16, 2015 by nelly

Science
Which of the following bodies are the hardest to tell apart because they are made of similar materials ? a) dwarf planets and comets b) asteroids and comets c) comets and meteoroids d) asteroids and meteoroids***
Friday, October 16, 2015 by Shalee ^~^

science
An aircraft lands with an initial velocity of 85 m/s and decelerates at 9.0 m/s2 until it travels at 4.0 m/s. (a) Calculate the distance travelled along the ground by the aircraft as it decelerates. (b) How long does this deceleration take? (First decide which equations to use)
Friday, October 16, 2015 by Paul

Science
A ball is thrown upward and returns to thrower hand in 12 seconds. What is speed with which ball is thrown and maximum height attained.
Friday, October 16, 2015 by Shrey

Science
I have a question from an old exam that I need help to understand, i'm not sure where to start An electron in an electronically excited hydrogen atom undergoes a transition from a 6d to a 2p orbital, resulting in the emission of a photon. The photon strikes a metal surface...
Thursday, October 15, 2015 by Dan

Science
I have a metal sheet of indium, and when a uv light with a wavelength of 265 nm is shone on it the surface ejects electrons that have a kinetic energy of 8.31x10^-20 J per ejected electron. I'm asked to find the threshold frequency, I need to know how to find it.
Thursday, October 15, 2015 by Dan

science
Which of the following would be true for the charged particles below ?
Thursday, October 15, 2015 by kayli

science- physics
Two spheres are launched horizontally from a 1.1 m -high table. Sphere A is launched with an initial speed of 4.5 m/s . Sphere B is launched with an initial speed of 1.5 m/s . What is the distance that sphere A travels from the edge of the table? What is the distance that ...
Thursday, October 15, 2015 by Laura

science
is tap water a pure substance..?
Thursday, October 15, 2015 by sally

Computer Science
Create an array to record the results of rolling a 6-sided die. The user determines the number of rolls. Output the results of each roll and the sum of all rolls. The rolls should produce a random integer from 1-6.
Thursday, October 15, 2015 by Paul

science
is a polyatomic considered a compound?
Thursday, October 15, 2015 by sally

science
Fill in the blank with the word or phrase that best completes the statement or answers the question. 14. The scientific name for a plant that reproduces with flowers is a(n) (1 point) 15. At certain times of the year, the male sage grouse can be seen inflating the air sacs on ...
Thursday, October 15, 2015 by Adri,

Science
Select the three terms that belong together. To do this, pick one term from each of the three sets. Set 1: intertidal zone, neritic zone, deep zone Set 2: moderate light levels, freshwater, temperature fluctuations Set 3: clams, squid, beavers A) intertidal zone, temperature ...
Thursday, October 15, 2015 by MsHemmoPenguin

Science
when an electric current is passed through water during the process of electrolysis, two gases are formed. One gas has the boiling point of -183 C and the other has a boiling point of -253 C. Has a physical change or a chemical change occurred? explain.
Thursday, October 15, 2015 by Myla

Science
Select the three terms that belong together. To do this, pick one term from each of the three sets. Set 1: intertidal zone, neritic zone, deep zone Set 2: moderate light levels, freshwater, temperature fluctuations Set 3: clams, squid, beavers A) intertidal zone, temperature ...
Thursday, October 15, 2015 by MsHemmoPenguin

science
What are differences between molecule and compound?
Thursday, October 15, 2015 by sujal

science
how do endotherms stay warm. plz help me
Wednesday, October 14, 2015 by k.c (hidding real name here)

science
Ethical conflict over cases of cross-border and multigenerational pollution is an example of a dispute relating to
Wednesday, October 14, 2015 by Anonymous

science
Covalent compounds are bad conductors of electricity.Why?
Wednesday, October 14, 2015 by sujal

science
what acceleraton would m2 in mass24 m/s2acceleratoin of an and m1 a force of 5n produces an acceleeration of 8m/s2 in mass
Wednesday, October 14, 2015 by sangita joshi

science
The concentration of sodium chloride in ocean water is on average 0.060 M. What mass of sodium chloride is present in 25 L of ocean water? How do I answer this question, I have no idea where even to start.
Wednesday, October 14, 2015 by alyssa

Science
Suppose you found a fossil of a clam shell what can you conclude about the once-living organism and how it became a fossil?
Wednesday, October 14, 2015 by HelpMePlease

science
what are two consequences of spraying insecticides to get read of mosquitoes
Wednesday, October 14, 2015 by manuel

science
Which variable in the following statement would be placed on the Y-axis of a graph? If the amount of light increases, then the plants will grow taller.
Wednesday, October 14, 2015 by Anonymous

science
A cubic container full of hot water at a temperature of 90 °C is completely lagged with an insulating material of thermal conductivity 6.4x10-4 Wcm-1K-1 (6.4x10-2 Wm-1K-1). The edges of the container are 1.0 m long and the thickness of the lagging is 1.0 cm. Estimate the ...
Wednesday, October 14, 2015 by Pam

science
A heat engine draws 800J of heat from its high temperature source and discards 450J of exhaust heat into its cold temperature reservoir during each cycle.How much work does this engine perform per cycle?
Wednesday, October 14, 2015 by MARK

science
does water ionize to hydrogen and hydroxide
Tuesday, October 13, 2015 by sujal

Physical Science
What happens to the kinetic energy of a snowball as it rolls across the lawn and gains mass?
Tuesday, October 13, 2015 by Katie

science
a crew of astronauts leaves earth on a Monday , lands on the moon on a Thursday. they and on the side of the moon facing away from the earth. on what day would the astronauts be able to see earth from the moon, explain
Tuesday, October 13, 2015 by robin a

SCIENCE
. How did planetesmals form planets? (1 point) 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. 2. Which parts of the sun’s atmosphere become visible during a total solar ...
Tuesday, October 13, 2015 by Shalee ^~^

Science
1. How did planetesmals form planets? (1 point) 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. 2. Which parts of the sun’s atmosphere become visible during a total solar ...
Tuesday, October 13, 2015 by Shalee ^~^

physcial science
8. which picture(s) would best represent atoms in the gas of a neon sign?
Tuesday, October 13, 2015 by sid

Science
which of the following includes the variables needed to demonstrate momentum A. mass and velocity B. mass and acceleration C. time and velocity D.velocity and acceleration I think the answer is A
Tuesday, October 13, 2015 by Animegirl

Science
which of the following includes the variables needed to demonstrate momentum A. mass and velocity B. mass and acceleration C. time and velocity D.velocity and acceleration I think the answer is A
Tuesday, October 13, 2015 by Animegirl

science
a boat starts sailing on monday 10:00 at harbour A and sail 600 km due north.later it turns due east for a further 420 km to reach harbour B on tuesday at 12:00.what is the total distance travelled from A to B
Tuesday, October 13, 2015 by thabo

science
1.)Ovaries contain A.)Sperms & produce estrogen B.) Sperms & produce testosterone C.)Eggs & produce estrogen D.)Eggs & produce testosterone 2.)The testes produce A.)Sperm & estrogen B.)Sperm & testosterone C.)Eggs & estrogen D.)Eggs & testosterone 3.)After an egg is fertilized...
Tuesday, October 13, 2015 by Adri,

Science
Hi!I wished you can help me with my science fair project.I don't know what to do or which to pick.Please help me.Any suggestion?I'm a fifth grader by the way.I appreciate it a lot. Endless Thanks, Marie
Tuesday, October 13, 2015 by Marie

Science
An air mass of 25°C with a dew point of 10°C has a starting elevation of sea level (0 meters) encounters a mountain range with a peak elevation of 3,000 meters above sea level. At what elevation is the Lifting Cloud Level?
Tuesday, October 13, 2015 by Kate

science
Write down images formed by the following mirrors. a)concave b)convex c)plain mirror
Tuesday, October 13, 2015 by Lavenia

science
A rock sample weight 60N on earth. what would be the weight of the same rock on moon?
Tuesday, October 13, 2015 by Lavenia

science
A drop of mass 2.0 g falls from a cliff of height 1.0 km. It hits the ground with a speed of 50.0 m/s. The work done by resistive force is 1. -10j 2. -12.50j 3. -15.5j 4. -17.50j solution:- I think change in kinetic energy can give me work done. But how to get resistive force.
Tuesday, October 13, 2015 by 911

science
A drop of mass 2.0 g falls from a cliff of height 1.0 km. It hits the ground with a speed of 50.0 m/s. The work done by resistive force is 1. -10j 2. -12.50j 3. -15.5j 4. -17.50j solution:- I think change in kinetic energy can give me work done. B ut how to get resistive force.
Tuesday, October 13, 2015 by 911

science
what is the main difference between lava and magma?
Tuesday, October 13, 2015 by Kelly

Science
A hypothetical element has two main isotopes with mass numbers of 56 and 59. If 61.00% of the isotopes have a mass number of 56 amu, what atomic weight should be listed on the periodic table for this element?
Monday, October 12, 2015 by Sarah

Science - Physics
Find the x-component of vector v⃗ = (310 m/s , 45 ∘ above +x-axis).
Monday, October 12, 2015 by Shiv

science
I have an essay about landforms on Friday what are some ideas?
Monday, October 12, 2015 by Derick

Science Urgent😖😖😖
Why most organisms reproduce A( organisms must reproduce to maintain genetic similarity in the species B( organisms must reproduce to continue to build genetic diverse city into the species C( organisms must reproduce to continue the species D( organisms must reproduce to ...
Monday, October 12, 2015 by Jirehn

Physical Science
If a skydiver has a forward velocity of 40 m/s, what is the forward velocity after one second? What is the downward velocity after one second?
Monday, October 12, 2015 by Robert

Science
An object has a length of 5.2 cm a width of 3 cm and a height of 1.5 cm what's the volume
Sunday, October 11, 2015 by Tyler

forensic science
if handwriting evidence was not yet considered to be considered to be scientific evidence at the time of united states v. starzecypzel,how was it admissible as reliable evidence
Sunday, October 11, 2015 by chris

Science
a. A human cell is placed in a container of sugar water. Explain what would occur, if the cell membrane is impermeable to sugar. b. Another cell is placed into a container of sugar water. However, this cell has the capability to allow large molecules such as sugar to pass ...
Sunday, October 11, 2015 by Eliza

phyical science
Which of the following phase changes is an endothermic change? A. condensation B. vaporization C. deposition D. freezing
Sunday, October 11, 2015 by sidney

phyical science
Boyle’s law states that the volume of a gas is inversely proportional to its pressure if the A. temperature and number of particles are constant. B. temperature reaches absolute zero. C. number of particles decreases. D. temperature and number of particles are doubled.
Sunday, October 11, 2015 by sidney

phyical science
Which of the following is NOT a pure substance? A. milk B. oxygen C. water D. carbon dioxide
Sunday, October 11, 2015 by sidney

Science/math
Newtons second law of motion states that F =MA Force equals mass multiplied by acceleration. Mass is the constant. It does not change. What is the independent and dependent variable? I put force is independent and acceleration is dependent. Is that right?
Sunday, October 11, 2015 by Katie

natural science
Draw a series circuit that contains : 2 cells in series, volmeter over the battery, an ammeter, closed switch and 2 light bulbs. also show direction of current flow.
Sunday, October 11, 2015 by boitumelo

science
The lift curve of the airfoil of an aircraft is as shown. The weight of the aircraft is 1500 kg. If the stall speed of the aircraft is 60 m/s, determine the wing area.
Sunday, October 11, 2015 by shelly

science
am stuck on the titration on maleic acid. am kindly asking for analytical chemistry by skoog.pdf. this assighnment is killing me. thank you
Sunday, October 11, 2015 by rexina

Science
If the spring have a stiffness of 950N/m what workwill be done in exerding the spring be 60mm
Sunday, October 11, 2015 by Alhasan

science
Calculate the work done by the brakes of a car of mass 1000kg when its speed is reduced from 20m/s and 10m/s
Sunday, October 11, 2015 by jaspreet kaur

science
a body B moving a velocity of 20m/s collid with anothet body A moving in the same direction on the same horzontal line with a velocity of 10m/s, if the of body A is three time the same of body B and the collion perfectly elastic calculate the velocity of A and aftet the ...
Saturday, October 10, 2015 by manbud

Science
Hi I've read everything and searched everything and I can't find the answer to this question so... How is iodine-131 and iodine-126 similar and how is it different? Thank you this is stressin me out!
Saturday, October 10, 2015 by ASHLEY

natural science
a fire fighter who weighs 800n climbs a uniform ladder and stops one third of the way up the ladder. the ladder is 5.0m long and weighs 180n. it rest against a vertical nail, making an angle of 53degree with the ground. find the normal and frictional forces on the ladder at ...
Saturday, October 10, 2015 by john lloyd

science
what is necessity of proper cleaning ? sanitation and spraying disinfectants in poultry farms?
Saturday, October 10, 2015 by shehzad

natural science
a 500-n diver stands at the end of 4.0-m diving board. the board is attached by two supports 1.5-m apart as shown below. find the tension in each of the of the two supports if the diving board weighs 150-n
Saturday, October 10, 2015 by john lloyd

Science
An electron travels 1.23 m in 4.66 × 10−8 s. How fast is it traveling? Answer in units of m/s.
Friday, October 9, 2015 by G

science
light that has a frequency of 1.5 x 1015 Hz.
Friday, October 9, 2015 by joel

Science
How is energy in a ecosystem replenished?
Thursday, October 8, 2015 by Varun

science
An iron cylinder with radius 1.0 cm and length 25 cm has one end held at 250°C and the other at 20°C. Find the heat-flow rate through the cylinder
Thursday, October 8, 2015 by Pam

science
Phosphorus in the soil comes from ?
Thursday, October 8, 2015 by Varun

science
in this experiment, 3 sets of plants were grown. one set had no light, one set had some light, one set had full sun. each set was given the same amount of water, the same temperature, the same soil and it was the same plant and same pot. in 21 days this is the amount of growth...
Thursday, October 8, 2015 by Alexandra

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