Saturday
September 5, 2015

Homework Help: Science

Branches of Science

Recent Science Questions

science
What will happen when I put in minty mentos into all different kinds of soda?
Wednesday, February 25, 2015 by Ashley

chemistry
The following equilibrium exists in a closed container: N2(g) + O2(g) = 2NO(g), ΔH = +181 kJ/mol. Which of the following perturbations would favor the formation of NO(g)? (practice MCAT question from The Princeton Review MCAT Science Workbook, 2009 edition) increasing the...
Wednesday, February 25, 2015 by danny

Science
Chargers extend the life of the rechargeable batteries by: A) adding protons to the positive electrode B) adding electrons to the positive electrode C) moving electrons back to the positive electrode D) Moving electrons back to the negative electrode
Wednesday, February 25, 2015 by Sammy

science
Explain what might have happened in Ruthford's experiment if he had used a thin sheet of copper instead of a thin sheet of gold
Wednesday, February 25, 2015 by cassie

Science
Reflecting telescopes are popular because they're A. more durable than a refracting telescope. B. easier to build than a refracting telescope. C. smaller than a refracting telescope. D. more powerful than a refracting telescope i said b but im torn between a and b
Wednesday, February 25, 2015 by Dave

Science
A sled and rider with a combined weight of 59 kg are at rest on the top of a hill 24 m high. (a) What is their total energy at the top of the hill? (b) Assuming there is no friction, what would the total energy be on sliding halfway down the hill?
Wednesday, February 25, 2015 by holly

science
Climate change studies suggest the worst impacts will be felt by the wealthiest people
Wednesday, February 25, 2015 by lolita

Probability
The joint PMF, pX,Y(x,y), of the random variables X and Y is given by the following table: (see: the science of uncertainty) 1. Find the value of the constant c. c = 0.03571428571428571428 2. Find pX(1). pX(1)= 1/2 3. Consider the random variable Z=X2Y3. Find E[Z∣Y=&#...
Wednesday, February 25, 2015 by RVE

science
A reflecting spherical Christmas tree ornament has a diameter of 12 cm. A child looks at the ornament from a distance of 18cm. A ... image will form at ... from the ornament
Wednesday, February 25, 2015 by zee

science
A reflecting spherical Christmas tree ornament has a diameter of 12 cm. A child looks at the ornament from a distance of 18cm. A ... image will form at ... from the ornament
Wednesday, February 25, 2015 by zeeshan

science
1.a modern train traveling at a constant speed around a circular track has a constant velocity true or false 2.which of the following would be affected if a soaring eagle change direction but remained at a constant speed? A.acceleration only B.velocity only C.acceleration and ...
Wednesday, February 25, 2015 by Hannah

Science
After returning from her morning walk, Laura states, "It is cold outside." What kind of statement is this?
Wednesday, February 25, 2015 by Alexgc

Earth Science
Hubble said that stars are moving away from the Earth because they have more of what color? Blue, Green, Red or Violet
Wednesday, February 25, 2015 by Alexgc

Science
A scientist wants to make their experiment more accurate. Which of the following should they do to ensure this. decrease their sample size nothing; there is no way to increase the accuracy of an experiment increase their control amount increase their sample size
Wednesday, February 25, 2015 by Alexgc

physical science
If the mans weight is 490N on earth,calculate his weight on the moon that has the gravitational force 1/2 of the gravitational force of the aerth
Wednesday, February 25, 2015 by nelson

science
two small spheres lie 1.5 meters apart and carry identical charges. How large is the charge on each if a sphere experiences a force of 2.0 N.
Tuesday, February 24, 2015 by Matthew

fundamentsl concepts ans skills
An approach to literacy connects, for example, mathematics and science to the real world. Such a process of combining subjects is referred to as A. logical grouping. B. cardinality. C. grouping. D. curriculum integration. I believe is a.
Tuesday, February 24, 2015 by lauren

Science
Describe the pattern of regional surface winds around the center of a low pressure system in the northern hemisphere?
Tuesday, February 24, 2015 by Daniela

Earth Science to Ms.Sue (urgent )
18.   The Cenozoic Era is also referred to as the  A. Age of Dinosaurs. B. Age of Mammals. C. Age of Fish. D. First Era. B???
Tuesday, February 24, 2015 by Sarah

science~Ms. Sue
A ____ is a substance that cannot be separated into similar substances by physical or mechanical methods such as filtering, boiling, or sifting. (I have to again write the answer)
Tuesday, February 24, 2015 by Aaliyah

Science~Ms. Sue
What is formed when particles of two or more substances are distributed evenly amongst each other? (I have to write in the answer)
Tuesday, February 24, 2015 by Aaliyah

Science~Ms. Sue
If you are describing methane as a gas that easily catches fire, you are describing a ____. A. state of matter*** B. physical property C. chemical property D. chemical formula I think it's A
Tuesday, February 24, 2015 by Aaliyah

Earth Science to Ms.Sue
9.   Another name for unicellular organisms that dominated Earth up to the Precambrian time is  A. eukaryotes. B. cyanobacteria. C. stromatolites. D. prokaryotes. D?
Tuesday, February 24, 2015 by Sarah

Science
If you are describing methane as a gas that easily catches fire, you are describing a ____. A. state of matter*** B. physical property C. chemical property D. chemical formula I think it's A
Tuesday, February 24, 2015 by Aaliyah

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
Tuesday, February 24, 2015 by Katie

Science
Three liters of nitrogen combine with 9 L of hydrogen to form 6 L of ammonia. If the molecules of nitrogen and hydrogen have two atoms each, how many atoms of hydrogen and nitrogen are there in one molecule of ammonia?
Tuesday, February 24, 2015 by Kayla

Physical science
A force t=312n up and incline is reward to keep a body at rest on a fritionless inclined plane which make an angle of 35degress with horizontal. Draw a force diagram and label all the force acting on a body. Calculate the magnitude of the force due to gravity and the normal force
Tuesday, February 24, 2015 by Thulaganyo

Earth Science
Why does the Earth have a magnetic field?
Tuesday, February 24, 2015 by Alexgc

science
Why do Ontario and Quebec generate the most electric energy?
Tuesday, February 24, 2015 by thez

science
CAN ONE IN THEORY OR ACTUAL DEPRIVE A PARTICULAR AREA OF SPACE; 1sq mile of space of oxygen while the surrounding area of space has normal levels of oxygen?.... This question is not limited by the use of other chemicals or machinations to achieve GOAL....
Tuesday, February 24, 2015 by mike

engineering science n3...please help and explain
Heat A.5kg of steel is cooled down in oil and the temperature drops from 900 degrees celsius to 27degrees celsius. The specific heat capacity of steel is 460J/kg degrees Celsius and that of oil 1.5kJ/kg degrees Celsius Calculate the following: 1.quantity of heat lost by steel ...
Tuesday, February 24, 2015 by cathy

Science
Which of the following types of pathogens can only reproduce itself if it takes over host cells? A fungi B bacteria C virus *** D protozoa am i right?
Monday, February 23, 2015 by anonymous

Science
What is DNA and RNA? How do it work? How does it reproduce? How does it mutate? How do things evolve?
Monday, February 23, 2015 by Hossain

Science please help
Which of the following types of pathogens can only reproduce itself if it takes over host cells? A fungi B bacteria C virus *** D protozoa am i right?
Monday, February 23, 2015 by Ann

Science
What is Genetics?
Monday, February 23, 2015 by Hossain

Science
What type of element is fluorine?
Monday, February 23, 2015 by Anonymous

Science
You have a block of ice with a mass of 6.12 . The volume of the water is 100L and the volume of water when the ice is in the water is 106.66L. I subtracted 100.00 and 106.66 to get 6.66L as the volume of the ice What I'm confused about is how to divide 6.12 by 6.66 in long...
Monday, February 23, 2015 by Alyssa

Science
A boy and girl sit on a seesaw of length 4m, balanced at its center. The girl sits at the far end and has a mass of 50kg. The boy is twice as heavy as the girl, and therefore sits midway between his end and the center. Then the girl is given a bag of oranges weighing 5kg, and ...
Monday, February 23, 2015 by Lola

science
How are weathering and soil formation related?
Monday, February 23, 2015 by Ricardo

science
How do water and air cause rocks to crumble?
Monday, February 23, 2015 by Ricardo

science
A ball sitting on the top of a table has potential energy but no kinetic energy. How do potential and kinetic energy change as the ball falls off the table to the floor? A. Both its potential energy and its kinetic energy decrease. B. Both its potential energy and its kinetic...
Monday, February 23, 2015 by Sabina

Science
Which of the following is an indication that a planet may exist near a distant star A. the star varies in temperature B. The star has a very slight back and forth motion C. the star has very strong gravity D. Radio wave activity increases near the star I think the answer is A
Monday, February 23, 2015 by Joseph

science
What is the density value of octane at the pressure of 101.325kpa and temperature of 298K?
Monday, February 23, 2015 by milly

AGRICULTURAL SCIENCE AND LIFE SCIENCES
MENTION 10 TYPES OF ENZYMES THAT ARE FOUND IN THE SMALL INTISTINE AND THEIR FUNCTIONS
Sunday, February 22, 2015 by CEE

science
The position-time graph for a tennis ball thrown vertically upwards from the second floor of a school building is shown below.ignore all effects of air friction.The height of the second floor is 6,5m.The ball rises 0,9 m from the point of projection before it starts to fall to...
Sunday, February 22, 2015 by ntando

science
m=-2.00i+6.00j-4k and n=2.00i-3.00j. what is the dot product of m and n?
Sunday, February 22, 2015 by dineo

Science
Directions: How high could your animal jump if it has an initial velocity of 20m/s? Average Mass of Animal: (800kg) (1100lbs) Jupitar’s Mass: 1.898E27 kg (317.8 mass)
Sunday, February 22, 2015 by Steffy

Earth Science
4.   Ancient cyanobacteria released ______, which assisted in creating the atmosphere as we know it today.  A. oxygen B. lead C. hydrogen D. ore A?
Sunday, February 22, 2015 by Sarah

science
A ball is dropped from a height of 10 m. If the energy of the ball reduces by 40% after striking the ground, how much high can the ball bounce back? (g=10m/s2)
Sunday, February 22, 2015 by Anonymous

science
Why does the energy of a sound wave decrease over time?
Saturday, February 21, 2015 by wilmary

science
Why did a portion of the tabletop get cold when Natasha placed her cold drink on the table? (1 point) The table’s molecules were vibrating more slowly in that area. The table’s molecules had spread further apart in that area. The table’s molecules had gained ...
Saturday, February 21, 2015 by Oscar

science
an ice cube, a glass of cold water, and a swimming pool are each exposed to the same amount of sunlight on a hot day. after five minutes, the ice cube is melted and the cold drink is two degrees warmer, but the temperature of the swimming pool remains unchanged. what is the ...
Saturday, February 21, 2015 by Oscar

science
both carbon dioxide and water are pure substances. how are they similar to each other? A. Both substances have a set ratio of atoms that cannot be separated by physical means. B. Both substances have a set ratio of atoms that can be separated by physical means. C. Both ...
Saturday, February 21, 2015 by Oscar

physical science
A car travels east for 15km at a speed of 30km/h .it then turns around and returns along the same path at 60km/h.what is the cars average velocity
Saturday, February 21, 2015 by comfort

Overdue Science Lesson, Very Urgent.
1: How does sea-floor spreading occur? A, New materials are being added to the asthenosphere. B, Earthquakes break apart the ocean floor. C, Sediments accumulate at the area of spreading. D, Molten material beneath Earth's crust rises to the surface. 2, Which features form...
Friday, February 20, 2015 by Anonymous :)!

Phyiscal Science
Jesse travels 3.0 meters east and then turns and travels 4.0 meters north. The trip requires 35 seconds. What is his velocity?
Friday, February 20, 2015 by Lilly

science
Does the flame of gas stove emit light
Friday, February 20, 2015 by Shaswat

Science
We had to make a homemade thermometer we had directions that told us how when we were done we had to answer questions but I don't get this one. How can you use the concepts of matter and the kinetic energy of particles to explain the way your model works I'm not good ...
Thursday, February 19, 2015 by LOL 101

Science please help
It is important that you maintain a healthy weight both for your overall health and so that your respiratory system can A. deliver oxygen more adequately B. pump blood more forcefully from the heart C. keep capillaries constricted D allow for smaller amounts of air to enter ...
Thursday, February 19, 2015 by Princess

Science
What is a molecule
Thursday, February 19, 2015 by Jjjjj

science
this muscle helps to transport blood to and from the heart A. smooth muscle B. cardiac muscle C. skeletal muscle D. involuntary muscle. Is it D
Thursday, February 19, 2015 by Anonymous

Science
How do thermometers relate to the kinetic energy of particles of matter? Can someone please help quick I need help and I need the answer to be at least a couple of sentences I have no clue what the answer is but this is only the second question I have posted on here so I'm...
Thursday, February 19, 2015 by LOL 101

Anthropology
Ms. Sue, can you please assist me on this? How has globalization affected cultural identities and consumerism? In today’s world the problem of cultural identity shouldn’t be miscalculated. In the world today there are more nation are affected by the phenomenon of ...
Thursday, February 19, 2015 by jimmy

Science
A fabric artist creates the elaborate banners that will be carried in battle. What role in the conflict is the artist taking on? A. Supporting the troops B. Documenting history. C. Raising awarenesss of an issue. D. Protesting of an event or circumstance. Is the asnwer D? ...
Thursday, February 19, 2015 by Callie

Science
A blind person walks the neighborhood making loud clicking noises with his tongue. He doesn't use a walking stick nor does he have a seeing-eye-dog. However, he avoids every obstacle and is able to navigate his way around the neighborhood safely. What can be inferred from ...
Thursday, February 19, 2015 by Callie

Science
Which of the following factors determines the loudness of a sound? A. Frequency of the sound wave. B. Amplitude of the sound wave. C. The temperature of the medium. D. The density of the medium. Is the answer B? Im getting confused betwwen B and D. Thank you
Thursday, February 19, 2015 by Callie

Science- 3rd request plzzz
Which of the following is true about the magnetic field diagram below. Its shows 3 Arrows on top pointing to B A B 3 Arrows on bottom pointing to B A A is the south pole and B is the north pole B A is the north pole and B is the south pole C A and B are repelling each other...
Thursday, February 19, 2015 by BUBBLES

Science
Which of the following is true about the magnetic field diagram below. Its shows 3 Arrows on top pointing to B A B 3 Arrows on bottom pointing to B A A is the south pole and B is the north pole B A is the north pole and B is the south pole C A and B are repelling each other...
Thursday, February 19, 2015 by BUBBLES

Science Help Plz
which of the following statements about earths atmosphere is true? a. earths atmosphere contains 78 percent water vapor which is essential to life b. earhts atmoshpere contains 21 percent oxygen c. earths atmosphere contains carbon dioxide which all life forms require d. ...
Thursday, February 19, 2015 by Kaitlyn

Science
Which most resembles a scientific model? A) computer keyboard B) computer hardware C) computer game D) computer mouse
Thursday, February 19, 2015 by Ashlyn

Science
Which of the following is true about the magnetic field diagram below. Its shows 3 Arrows on top pointing to B A B 3 Arrows on bottom pointing to B A A is the south pole and B is the north pole B A is the north pole and B is the south pole C A and B are repelling each other...
Thursday, February 19, 2015 by BUBBLES

physical science
when a 65 kg skydiver jumps from a plane, and her kinetic energy is 7.05*10 to the 5th power J how fast is she falling
Wednesday, February 18, 2015 by cassie

Science
An echo occurs when a sound wave bounces off a smooth surface and travels back in the same direction it came. This is an example of A. Reflection. B. Refraction. C. Scatter. D. Absorption. Is the answer A? Thanks
Wednesday, February 18, 2015 by Callie

Science
Which of the following affects the speed of sound? A. The amplitude of the wave. B. The frequency of the wave. C. The phase of the medium. D. The wavelength. Is the answer A? Thank you
Wednesday, February 18, 2015 by Callie

science(sound#4)
What instrument has a low pitch?
Wednesday, February 18, 2015 by Alyssa

science(waves)
What do waves transfer?
Wednesday, February 18, 2015 by Alyssa

science(sound #3)
Space has no air, what is another name for no air?
Wednesday, February 18, 2015 by Alyssa

science
1. The sporophyte generation produces spores that grow into a(n) (1 point) gametophyte. gymnosperm. angiosperm. pupa. 2. Placental mammals develop (1 point) in an egg laid in water. in a pouch on the mother’s body. inside the mother’s body. inside an amniotic egg. 3...
Wednesday, February 18, 2015 by lizz

science (sound #2)
What temperature makes sound travel slower?
Wednesday, February 18, 2015 by Alyssa

science (sound)
what temperature makes sound travel faster?
Wednesday, February 18, 2015 by Alyssa

science (aka sound)
What are the 3 things that a medium can be in sound?
Wednesday, February 18, 2015 by Alyssa

Physical Science
Calcium Carbonate combines with Hydrochloric acid to produce Calcium chloride and water and carbon dioxide. I have the skeletal equation of _Ca(CO3)+_HCl>_CaCl2+_H2O+_CO2 is that equation right? if so, how to I balance it?
Wednesday, February 18, 2015 by Hannah

science
What are the 3 things that a medium can be?
Wednesday, February 18, 2015 by Alyssa

Math
47. For science class, Kyle needs to make a dilute solution of 12 ounces that is 30% vinegar. But he only has 20% vinegar 60^ vinegar. How many ounces of 20% vinegar should he use? A. 3 ounces B. 6 ounces C. 9 ounces D. 10 ounces
Wednesday, February 18, 2015 by Matthew

Science
Which of the following affects the speed of sound? A. The amplitude of the wave. B. The frequency of the wave. C. The phase of the medium. D. The wavelength. Is the answer D? Thank you
Wednesday, February 18, 2015 by Callie

Science
Which of the following factors determines the loudness of a sound? A. Frequency of the sound wave. B. Amplitude of the sound wave. C. The temperature of the medium. D. The density of the medium. Is the answer d? Thank you
Wednesday, February 18, 2015 by Callie

science
What are the transporters of protein in plants?
Wednesday, February 18, 2015 by Megan

Science
In which of the following situations is a sound wave most likely to travel through air? A. An alarm clock rings in a vaccum. B. A giant star explodes. C. A grasshopper eats a leaf. D. An astronaut uses tools in space. Is the answer A? Thank you.
Wednesday, February 18, 2015 by Callie

Science
Removing Waste 1) Which of the following best explains why it is necessary for the body to eliminate waste? :To allow the body to maintain a certain size. :To keep the body’s internal environment in balance.*** :To make room for nutrients coming in. :To reduce unpleasant ...
Wednesday, February 18, 2015 by TheLOUDEST_0430

science
1. What would happen to an object if the force of gravity on Earth was decreased by half? (1 point) Its mass would decrease. Its weight would decrease.* Its density would decrease. Its volume would decrease. 2. Which of the following represents a heterogeneous mixture? (1 ...
Wednesday, February 18, 2015 by Oscar

science
A box with a weight of 100N rests on l horizontal floor .
Wednesday, February 18, 2015 by anovuyo

science
A ball sitting on the top of a table has potential energy but no kinetic energy. How do potential and kinetic energy change as the ball falls off the table to the floor? A. Its potential energy increases, and its kinetic energy decreases. B. Its potential energy decreases, and...
Wednesday, February 18, 2015 by Aspen

physical science
A 0.5 kg block initially at rest on a frictionless, horizontal surface is acted upon by a force of 5.0 N for a distance of 4.0 m. How much kinetic energy does the block gain? What is its final velocity?
Wednesday, February 18, 2015 by Bia

science
Calculate the ph of a buffer solution containing 0.2M NH4OH and 0.25M NH4Cl kb=1.8×10
Wednesday, February 18, 2015 by rupesh

science
Paul threw a paper plane towards the west. The wind however caused the plane to move in a southwestern direction Which statement best describes the direction of the wind? (A) The wind is blowing f r o m the east. (B )The wind is blowing f r o m the west. (C) The w ind is ...
Wednesday, February 18, 2015 by a

physical science
A car drivers at 5 km/hr, consumes one liter of petrol per 50km. The RPM is 50. How many mintues will the car drive on one litre of petrol. Kindly supply formula and answer.
Wednesday, February 18, 2015 by eugene

Math
A survey of 59 customers was taken at a bookstore regarding the types of books purchased. The survey found 36 customers purchased mysteries, 28 purchased science fiction, 21 purchased romance novels, 15 purchased mysteries and science fiction, 12 purchased mysteries and ...
Wednesday, February 18, 2015 by Mia

Science
I need an acrostic poem for Balanced Forces and Unbalanced Forces!
Tuesday, February 17, 2015 by Anonymous

Physical Science
A rock is dropped off a 20m tall cliff. How long does it take to get to the bottom of the cliff? What is the instantaneous velocity right before it hits the bottom of the cliff?
Tuesday, February 17, 2015 by Alex

Science
Q1. Why is the shape of the nerves important in the nervous system? Q2. Which structure is more complex, a tissue or an organ? How do you know?
Tuesday, February 17, 2015 by Daisy

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