Thursday
July 28, 2016

Homework Help: Science

Branches of Science

Recent Science Questions

science
If there is a fish bowl with a fish in it 2 turtles and some seaweed in it, would that be a ecosystem or a community. (there is also some sand in there(abiotic)).
Monday, February 15, 2016 by Yvr int'l airport

Science
Two blocks of mass M kg and 2,5 kg respectively are connected by a light,inextensible string.The string runs over a light,frictionless pulley
Monday, February 15, 2016 by Siyabonga

Building science&propaties of materials
With the aid of a diagram explain the change in frequency with respect to changes in mass,leinght tension on a sonometer bridge
Monday, February 15, 2016 by Hamza umar

Science
When are tides in earth's oceans the highest? A. during the moon's waning gibbous phase. B. during the moon's waxing gibbous phase C. when the moon is at a right angle to the sun*** D. when the sun, Earth, and moon are in line
Monday, February 15, 2016 by Angel

Physical science
How much more does someone with a bachlors degree usually earn than someone with a high school deploma?
Monday, February 15, 2016 by Lina

Physical science
What are some of the reasons for income differences?
Monday, February 15, 2016 by Lina

Earth Science
If we were to increase atmospheric CO2 fivefold by the burning of fossil fuels, how much would the atmospheric oxygen concentration change relative to what it is today? Assume: (a) CO2 concentration today is 400 ppm, (b) the atmosphere today is made of 21% oxygen, and (c) the ...
Monday, February 15, 2016 by Marisa

science
A bullet of 29g is shot from a gun of mass 20kg with a muzzle velocity of 200ms if the bullet is 30cm long.determine. a)acceleration of the bullet b)the recoil velocity of the gun
Monday, February 15, 2016 by brian

Science 8
Gravity pulled three toy cars of different cases down an inclined ramp, 0.3 kg, 0.9 kg, and 1.8 kg. What is the ratio of the masses of the toy cars?
Monday, February 15, 2016 by cortez

science
solution contains 0.50M Nh3 and 1.50 M Nh4cl. What is the maximum concentration of mg2+ that can be present in such a solution without precipitating Mg(oh)2?
Monday, February 15, 2016 by dffddx

Science
How many traits are involved in a monohybrid cross? How many alleles are involved? What prevents the expression of a recessive allele? When gametes form, what happens to the alleles for each trait?
Monday, February 15, 2016 by Teresa

science
1.scientists who capture fish from depths of 1000m or more for study have to bring them to the surface in pressurized containers. why do they do this? 2.a car of mass 600 kg has four tyres each of surface area 0.005m^2. determine the pressure exerted by each tyre on the ground...
Monday, February 15, 2016 by sim

science
1.scientists who capture fish from depths of 1000m or more for study have to bring them to the surface in pressurized containers. why do they do this? 2.a car of mass 600 kg has four tyres each of surface area 0.005m^2. determine the pressure exerted by each tyre on the ground...
Monday, February 15, 2016 by sim

Science
Two Tugboats pull a disabled supertanker. Each tugboat exerts a constant force 1.8x10^6 N, one at 10° west of North and other at 10° east of north, as they pull the tanker 0.50km towards north. The mass of the tanker is 2.20x10^8 kg. What is the total work the tugboats...
Monday, February 15, 2016 by Majid

Physical science
What is the force of gravity between two 1215 kg cars separated by a distance of 31m on an interstate highway
Sunday, February 14, 2016 by Anonymous

science
Two knights on horseback start from rest 88.0 m apart and ride directly toward each other to do battle. Sir George's acceleration has a magnitude of .300 m/s^2, while Sir Alfred's has a magnitude of .200 m/s^2. Relative to sir Ggeorge's starting point, where do the...
Sunday, February 14, 2016 by a

science
A box is pulled across the floor a at constant speed it is pulled horizontal force of 48 N
Sunday, February 14, 2016 by otis

Math
A science class has 3 girls and 3 boys in the seventh grade and 4 girls and 1 boy in the eighth grade. The teacher randomly selects a seventh grader and an eighth grader from the class for a competition. What is the probability that the students she selects are both boys?
Sunday, February 14, 2016 by Brooke

Science
Two tugboat A and B tow alarge boat in an easterly direction the cable which are connected to A and B respectectively make angles of 45 degrees north of east and 30 degrees south of east to the direction of motion (question it the tension fa is equal to 10000N calculate the ...
Sunday, February 14, 2016 by Sanele

science
it is possible for two obje to have the same dimensin but different units
Sunday, February 14, 2016 by khensytomboy

science
A light inelastic string connects two objects of mass 6kg and 3kg respectively. They are pulled up an inclined plane that makes an angle of 30 degrees with the horizontal,with a force of magnitude F. Ignore the mass of the string. Calculate the tension in the string if the ...
Sunday, February 14, 2016 by zama

science
Determine graphically the equilibrant of two forces of 15N and 20N if the angle between them is 135degrees
Sunday, February 14, 2016 by Homework

science
What do you mean by law of conservation of energy. Use this law to find speed of an object just before hitting the ground if it is allowed to fall through a height of 19.6m.
Sunday, February 14, 2016 by peehu goyal

science
the radius of planet x is twice that of the earth and its mass is also twice that of the earth. The gravitational acceleration on planet x would be approximatley?
Sunday, February 14, 2016 by thabo

Science
Why are weather balloon soundings done at the same time around the world?
Sunday, February 14, 2016 by Anonymous

Science Please Help!!!
A woman with a genetic disease marries a man who does not carry the disease. It is not possible for their children to carry the disease. The disease must be a) sex - linked b) recessive c) dominant d) cause by an extra chromosome I think the answer is recessive, can someone ...
Saturday, February 13, 2016 by Sammy

science chemistry
A ground state hydrogen atom absorbs a photon of light having a wavelength of 93.03 nm. It then gives off a photon having a wavelength of 396.9 nm. What is the final state of the hydrogen atom? Values for physical constants can be found here.
Saturday, February 13, 2016 by Anisha

Geography ,life science
Plz help me I dont understand the charpter of cells in life science
Saturday, February 13, 2016 by Mankosi

Science
Locate the centre of mass of a system of two spherical masses of 5kg and 10kg kept with their centres 1m apart
Saturday, February 13, 2016 by Falguni

Physical Science
4. What measurable property/properties affects the period of a pendulum? 7.Give another example of periodic motion other than simple harmonic motion. 8. If you landed on the moon, could you use the pendulum method to find "g" there? Explain.
Friday, February 12, 2016 by Sherianna

science
aranging these compounds deceding caco3 caso4 Nacl Mgcl
Friday, February 12, 2016 by disura

science
Which of the following determines the carrying capacity of a particular population by an ecosystem? 1. keystone species 2. pioneer species 3. limiting factors**** 4. renewable resources.
Friday, February 12, 2016 by little dark one

science
2. A salamander is a keystone species in a forest ecosystem with high biodiversity. This species migrates from woodland areas to a local stream to reproduce. If a road is built that cuts off the woodland areas from the stream, what effect will this have on the forest ecosystem...
Friday, February 12, 2016 by little dark one

science
Just checking my answers.. 1. Which is not a characteristic of the Group 1 alkali metals? A. high densities B. low melting points*** C. found in batteries D. silvery solid 2. Which of the following is true of the Group 2 alkali earth metals? A. They are less dense than the ...
Friday, February 12, 2016 by Anon.

science
A force of 200N is resolve in two forces if one component is equal to 120N and makes an angle of 30¡ã with 200N force find the other force
Friday, February 12, 2016 by Abhinav

Science
As a raindrop falls from a cloud to the surface of Earth, A.its speed increases due to gravity. B.its speed increases due to air resistance. C.t moves at a constant speed. D.>it moves at a constant velocity I think it is A. Am i right??
Friday, February 12, 2016 by -_- . _-_

science
A force of 200N is resolve in two forces if one component is equal to 120N and makes an angle of 30¡ã with 200N force find the other force
Friday, February 12, 2016 by Abhinav

science
calculate the average speed in km/h of a car travelling at 50km/h for 30minutes, and then at 71 km/h for one hour
Friday, February 12, 2016 by maeco

Science - 1 Question
A small fish in the pacific ocean watches a shark swim by a large rock a few meters away. Which of the following is a reference point in this scenario? A. shark ** B. large rock C. water D. pacific ocean I think the answer is A, please check!
Thursday, February 11, 2016 by Laci

Physical Science
A small fish in the pacific ocean watches a shark swim by a large rock a few meters away. Which of the following is a reference point in this scenario? A. shark ** B. large rock C. water D. pacific ocean I think the answer is A, please check!
Thursday, February 11, 2016 by Laci

Science - 1 Question
A small fish in the pacific ocean watches a shark swim by a large rock a few meters away. Which of the following is a reference point in this scenario? A. shark ** B. large rock C. water D. pacific ocean I think the answer is A, please check!
Thursday, February 11, 2016 by Laci

Science
1. If the net force on an object is O N, the forces are considered unbalanced. true false** 2. Most people in the United States use feet and miles to measure distance in their everyday lives. Why do scientists in the United States use meters to measure distance? Meters allow ...
Thursday, February 11, 2016 by Samantha

science
a solution containing 4.2g KOHand Ca(OH) 2 is neutralized by an acid. it consumes 0.1 equivalent of acid, calculate the percentage composition of the sample
Thursday, February 11, 2016 by Anonymous

science
a solution containing 4.2g KOHand Ca(OH) 2 is neutralized by an acid. it consumes 0.1 equivalent of acid, calculate the percentage composition of the sample
Thursday, February 11, 2016 by Nikita

Science
1. If the net force on an object is O N, the forces are considered unbalanced. true false** 2. Most people in the United States use feet and miles to measure distance in their everyday lives. Why do scientists in the United States use meters to measure distance? Meters allow ...
Thursday, February 11, 2016 by Samantha

Science
You drop a ball, mass 117.1 grams from a height of 68.9 cm. It bounces back to a height of 48.1 from the floor. What is the change in gravitational potential energy from the moment it is dropped, to the moment it reaches the maximum height from the bounce?
Thursday, February 11, 2016 by Jack

Math
Jenny's mean score on three science tests was 75. Her last two scores were 79 and 80. She forgot her score on the first test. What was it?
Thursday, February 11, 2016 by Sorin

science
HELP ILL DO ANYTHING How is a scientific theory different from a hypothesis?
Thursday, February 11, 2016 by cool kid 32

Science
Does sunlight have a chemical equation
Thursday, February 11, 2016 by SINE

history, geo,maths, l,s
guys my dream is to be a nurse,but iam doing history, geography, mathematical literacy, life science, so I dont know where to study, how much will it cost.iam staying at northwest so help
Thursday, February 11, 2016 by ditibane palesa

science
convert your answer from 3 to meters per second.
Thursday, February 11, 2016 by sierra

Science
Which Idea Is Conveyed In Both "Dust Of Snow" and Who Knows If The Moon's A.Nature can be playful B.Nature can be harsh C.Nature can be annoying D.Nature can be mysterious To Which Sense Do Both "Who Knows If The Moon's" and "Dust Of Snow ...
Thursday, February 11, 2016 by Sid.V

science help now plz
a geneticist is studying a pedigree that shows the family history of a recessive genetic diease. which of the following pedigrees shows an impossible relationship.
Thursday, February 11, 2016 by cassie

maths,geography,agriculture,life science
I am a grade ten learner I was aking wich career can I follow when doing those subjects?
Thursday, February 11, 2016 by jennifer phorotlho

Science
When hair is combed with a hard rubber comb, the hair becomes positively charged because the comb A. Transfers protons to the hair B. Remove electrons from the hair C. Transfers electrons to the hair D. Remove both times from the hair I could be removed electrons from hair . ...
Thursday, February 11, 2016 by Sara

Science
If you add a battery to a series circuit, what will happen to the current in the circuit? A. The current both stayed the same since there is the same resistance B. The comment will increase since there is less resistance C. The current will increase since there is more voltage...
Thursday, February 11, 2016 by Sara

Physical Science
A car of mass m traveling at a velocity of 20m/s east on a straight level road and a truck of mass 2m travelling at 20m/s west on the same road. ignore the effects of friction. calculate the velocity of the truck-car system immediately after collision. On impact the car exerts...
Thursday, February 11, 2016 by Petunia

Science (Physics)
A ball is projected horizontally from the top a hill with a velocity f 30mls. If it reaches the ground 5seconds later, the height of the hill is?
Thursday, February 11, 2016 by Ben

Science (Physics)
A ball is projected horizontally from the top a hill with a velocity of 30mls. If it reaches the ground 5seconds later, the height of the hill is?
Thursday, February 11, 2016 by Ben

science
Two wires if the same metal and of the same dia. And same length are connected in series 1st n then parallel, the ratio of energy produced during series n parallel connection will be .....  A. 1:2  B. 2:1  C. 1:4  D. 4:1
Thursday, February 11, 2016 by sanjay

Science
What time would you use to measure the time it takes to travel from your house to New York
Thursday, February 11, 2016 by Jake

Science
a baseball catcher is catching a fastball that is thrown at 43 m/s by the pitcher. if the mass of the ball is .15 kg and if the catcher moves his mitt backward toward his body by 8 cm as the ball lands in the glove what is the force on the mitt?
Wednesday, February 10, 2016 by Kaylee

science
a concrete column has a mass of 2205kg calculate the height of the column if the density of concrete is 2450kg/m(square) D=m÷v. 2440kg/squre=2205kg÷v. i dont knw the volum
Wednesday, February 10, 2016 by prudy

physical science
a car accelerates from rest at stop street and covers 10m east in 45.calculate the acceleration of the car(assume uniform acceleration).
Wednesday, February 10, 2016 by grace

Science
Which of the following parts of a circuit is not actually necessary for the circuit to function? A. Wire B. Load C. Switch D. Energy source I put B. The load. I know you need wires to function since they connect the parts of the circuit. The switch turns the circuit on. I wasn...
Wednesday, February 10, 2016 by Sara

Science
Sand or gravel that naturally forms near Earth's surface is known as A. pollen. B. ore. C. aggregate. (D. bedrock.) When new clay sediment is deposited on top of old beach material, it's known as A. regression. (B. transgression.) C. progression. D. aggression.
Wednesday, February 10, 2016 by Jocelynn

Science
what is the importance of ph to biological systems in the human body? I have an answer but is there anything else I could include and is my answer justified? My answer: Changes in the ph could be harmful, Natural buffers prevent rapid or large changes in the pH of living ...
Wednesday, February 10, 2016 by Mitch

Science (1 question)
Question #1: A maglev train uses powerful magnets to lift the train above the tracks as it moved forward. Such a design reduces which of the following forces? a. rolling friction b. gravity c. air resistance d. fluid friction I think the answer is "b" because gravity...
Wednesday, February 10, 2016 by Gourami

science help PLS
Which of the following soil components results from the breakdown of parent material? Gases Moisture Minerals Organic material is it d
Wednesday, February 10, 2016 by Oscar

Science
Lava and other materials that are launched from a volcano into the air are referred to as A. flows. B. tephra. (C. magma.) D. basalts. but i also think its B Which earthquake scale takes into consideration the damage caused by an earthquake? (A. Modified Mercalli scale) B. ...
Wednesday, February 10, 2016 by Jocelynn

Science
How can I describe the following things about water in sketches or drawings? please give me ideas 1.High heat capacity 2.High heat of vaporization 3.Water is a solvent 4.Water molecules are cohesive and adhesive 5. Frozen water is less dense than liquid water 6. Water has a ...
Wednesday, February 10, 2016 by Kylie

Science
Which statement best describes the Richter scale? A. It's named after a scientist who studied tornadoes. (B. It's a numerical rating system that measures the largest seismic waves during an earthquake.) C. It's a numerical system that measures the smallest seismic ...
Wednesday, February 10, 2016 by Jocelynn

Science
An object weighing 90 N has a volume of 45 mL and a mass of 9.0 g. What is its density? A. 0.10 g/mL B. 0.20 g/mL •• C. 5.0 g/mL d. 10 g/mL correct me!!
Wednesday, February 10, 2016 by Kiana

Science 8B; Plate Tectonics
The image above shows the Andes Mountains. Which of the following processes formed this feature? A) Glaciers deposited sediment B) Plates converged together to form the mountains C) Plates pulled apart an released magma D) Sand dunes hardened and became rocks I've read the...
Wednesday, February 10, 2016 by CyberDarkness

Science
Submerged basaltic volcanoes that are higher than 1 km are called (A. seamounts.) B. abyssal plains. C. guyots. D. hydrothermal vents
Wednesday, February 10, 2016 by Jocelynn

i need help with science pls
Which of the following types of stars started out on the main sequence with the largest initial mass? In Graph A, the curve peaks at 800 nm, in the red section of the visible light spectrum. In Graph B, the curve peaks at 550 nm, in the green section of the visible light ...
Wednesday, February 10, 2016 by Jason

Science
A basketball momentarily changes shape as it bounces off the floor. This is due to balanced forces acting on the ball. True False False?
Wednesday, February 10, 2016 by Laurie

Friction and Gravity
Question #1: If the net force on an object is 0 N, the forces are considered unbalanced. a. true b. false I think that the answer is "b" since unbalanced forces causes objects to move and have like 5 N or so on. Question #2: Most people in the United States use feet ...
Wednesday, February 10, 2016 by Gourami

science
Two wires if the same metal and of the same dia. And same length are connected in series 1st n then parallel, the ratio of energy produced during series n parallel connection will be ..... A. 1:2 B. 2:1 C. 1:4 D. 4:1
Wednesday, February 10, 2016 by sanjay

Biology /science
How can I describe the following things about water in sketches or drawings? please give me ideas 1.High heat capacity 2.High heat of vaporization 3.Water is a solvent 4.Water molecules are cohesive and adhesive 5. Frozen water is less dense than liquid water 6. Water has a ...
Wednesday, February 10, 2016 by Kylie

science
Two wires if the same metal and of the same dia. And same length are connected in series 1st n then parallel, the ratio of energy produced during series n parallel connection will be ..... A. 1:2 B. 2:1 C. 1:4 D. 4:1
Wednesday, February 10, 2016 by sanjay

Science
1. A roach moves down the hall at 1.2 m/s. When he sees the janitor coming down the hall, he begins to run. After 3.2 s, he is moving at 3.6 m/s. What is his acceleration? 2. While waiting for his Mom to come out of the hairdresser's, Sean accidentally puts the car in gear...
Wednesday, February 10, 2016 by Anonymous

physical science
a flywheel given its angular velocity of 200radian per second and an acceleration of 5radian per second squared in 15minutes.what is angular velocity in radian per second and revolution per minute
Tuesday, February 9, 2016 by Anonymous

science
Determine your distance traveled and displacement if you walk 100 m forward and then 35 back ward
Tuesday, February 9, 2016 by blessingolawole

Environmental science B
1.(1 point) The increase in use of electricity and oil as well as the expectation that dependency on foreign oil will ______ over the next ten years has lead to the restructuring of current energy policies. Double**** Triple Decrease Stay the same 2.(1 point) Which of the ...
Tuesday, February 9, 2016 by Patty

Science
Please check my answers. 1) Fossils are the ______. a. oldest layers of rock in a region b. remains or traces of prehistoric life. (my answer) c. objects that people of long ago left behind as artifacts. 2) In what type of rocks are most fossils found? a. sedimentary rocks (my...
Tuesday, February 9, 2016 by Jake

science
Using _______ helps some smokers quit by gradually decreasing their dependence on nicotine. Answers: A. Stimulants B. Nicotine Substitutes C. Inhalers D. Nicotine Inhibitors
Tuesday, February 9, 2016 by jjiiddss

SCIENCE HELP PLEEASE
Given the following images, choose the one that most likely represents an O-class star. Star A is a yellow star. Star B is a blue star. Star C is a red star. Star D is a green star. A B C D is it b
Tuesday, February 9, 2016 by Oscar

SCIENCE HELP PLEEASE
Which of the following types of stars started out on the main sequence with the largest initial mass? In Graph A, the curve peaks at 800 nm, in the red section of the visible light spectrum. In Graph B, the curve peaks at 550 nm, in the green section of the visible light ...
Tuesday, February 9, 2016 by Oscar

science
A ball rolls off the edge of a tabletop and then lands on the floor 80 cm away from the base of the table. if the table is 1.20 high what is the initial velocity?
Tuesday, February 9, 2016 by Anonymous

Earth Science
Which of the following climates is most suited for physical weathering? A. Warm B. Dry (C. Hot) D. Cool What latitudes are most likely to see glaciers? (A. 90° N and 90° S) B. 30° N and 30° S C. 45° N and 45° S D. 10° N and 10° S
Tuesday, February 9, 2016 by Jocelynn

science
oxgen enters the blood in the
Tuesday, February 9, 2016 by jjiiddss

Earth Science
Which of the following climates is most suited for physical weathering? A. Warm B. Dry (C. Hot) D. Cool What latitudes are most likely to see glaciers? (A. 90° N and 90° S) B. 30° N and 30° S C. 45° N and 45° S D. 10° N and 10° S
Tuesday, February 9, 2016 by Jocelynn

Agricultural Science
In Three sentence state or explain how weathering is affected by climate
Tuesday, February 9, 2016 by Chidera

Earth Science
What are the two most common minerals located in Earth's crust? (A. Feldspar and quartz) B. Iron and copper C. Diamonds and gold D. Salt and saline Climatology is a subspecialty of A. environmental science. B. oceanography. (C. meteorology.) D. marine biology.
Tuesday, February 9, 2016 by Jocelynn

Science
The function of the magnified structure shown lungs is blank exchange
Tuesday, February 9, 2016 by Anonymous

Science
The small piston of a hydraulic lift, has an area of 0.01 m2. If a force of 250 N is applied to the small piston, find the force on the large piston if it has an area of0.05 m2.
Tuesday, February 9, 2016 by Anonymous

science
How is water the determinant of plant and animal distribution?
Tuesday, February 9, 2016 by maydre

Science
Describe the flow of blood in the human body, including through each four chambers of the heart.Explain how the blood changes as it moves through various locations of the body
Tuesday, February 9, 2016 by Paige

science
which of the following shows the correct order from smallest to largest community, orginism, population, ecosystem
Tuesday, February 9, 2016 by jjiiddss

  1. Pages:
  2. <<Prev
  3. 8
  4. 9
  5. 10
  6. 11
  7. 12
  8. 13
  9. 14
  10. 15
  11. 16
  12. 17
  13. 18
  14. 19
  15. 20
  16. 21
  17. 22
  18. Next>>