Sunday
February 19, 2017

Homework Help: Science

Branches of Science

Recent Science Questions

physical science
How many minutes would be required for a 310.0 W immersion heater to heat 202.0 g of water from 22.0°C to 95.6°C?
Sunday, February 19, 2017 by Keisha morris

Physical Science
MH = 16.32 g/kg SH = 9.86 g/kg Air mass temperature = 15° C (59° F) What is the Relative humidity & the approximate Dew-point temperature? How do i set this problem up? I do not understand. Thanks
Sunday, February 19, 2017 by Jules

material science
What is the ratio of the maximum axial stress to the maximum bending stress in the inclined cell walls of hexagon honeycombs in terms of t,h ,l, and theta?
Sunday, February 19, 2017 by lorenzo

Science
What is methanol?
Sunday, February 19, 2017 by J

science
a body is released from the great height and falls freely towards the earth . another body is released from the same height , one second later . then the separation between the two bodies , two seconds after release of the second body is
Sunday, February 19, 2017 by farha

science
Taking the resistivity of platinoid as 3.3 x 10-7 m, find the resistance of 7.0 m of platinoid wire of average diameter 0.14 cm.
Saturday, February 18, 2017 by kaivonh

science
writing balanced chemical reaction of K2CO3 (s) with HCl (aq)??
Saturday, February 18, 2017 by hashini

Computer science
Final project Which is currency converter by camera from € to £ for example And not need to be perfect program so simple as my teacher told me and by java language So its like making an application then write the report 6300 around that
Saturday, February 18, 2017 by Abdulaziz

SCIENCE
Calculate the mass of caco3 required to liberate 10liters of co2 at stp?
Saturday, February 18, 2017 by ARYA K

Science
Ammonia may be oxidised to nitrogen monoxide in the presence of a catalyst according to the following equation. 4NH3 +5O2-4NO+6H2O.If 27 litres of reactants are consumed ,what volume of nitrogen monoxide is produced at the same temperature and pressure?
Saturday, February 18, 2017 by Nisha

Math
Rachel answer 20 out of 25 questions correctly on her science test what percent of the questions did she answer correctly
Friday, February 17, 2017 by Ciara

science, chemistry
Lead metal is added to 0.150 M Cr3+(aq). Pb(s)+2Cr3+(aq)⇌Pb2+(aq)+2Cr2+(aq). KC=3.2×10−10 What is [Pb2+] when equilibrium is established in the reaction? What is [Cr2+] when equilibrium is established in the reaction? What is [Cr3+] when equilibrium is established in the ...
Friday, February 17, 2017 by Sara

physical science
A uniform stripe of eureka (resistivity 5-0 × 〖10〗^(-7) Ωm) has a resistance of 0.80 Ω per metre and is 0.25 cm wide. What is its thickness? (show work)
Friday, February 17, 2017 by michelle

physical science
A block of carbon, 1.0 cm by 2.0 cm by 5.0 cm has a resistance of 0.80 Ω between its two smaller faces. What is the resistivity of carbon? (show work)
Friday, February 17, 2017 by michelle

physical science
. The maximum allowable resistance for an underwater cable is one hundredth of an ohm per metre. If the resistivity of cooper is 1.54 × 〖10〗^(-8) Ω m, find the least diameter of a copper cable that could be used (show work)
Friday, February 17, 2017 by michelle

physical science
What length of German silver wire, diameter 0.050 cm, is needed to make a 28 Ωresistor, if the resistivity of German silver is 2.2 × 〖10〗^(-7) Ω m (show work)
Friday, February 17, 2017 by michelle

physical science
The resistance of the ohm is very approximately that of a column of mercury 1.06 m long and of uniform cross-section of one hundred of a cm^2. Find the resistivity of mercury.(show work)
Friday, February 17, 2017 by michelle

physical science
Taking the resistivity of platinoid as 3.3 × 〖10〗^(-7) Ω m, find the resistance of 7.0 of platinoid wire of average diameter 0.14 cm.
Friday, February 17, 2017 by michelle

physical science
The heating elements of an electric toaster is typically made of nichrome wire (an alloy of nickel and chromium). As current passes through the wires, the wires heat up, thus toasting the toast. Estimate the overall resistance of a heating element which is 220 cm long and ...
Friday, February 17, 2017 by michelle

pyhsical science
A wire of uniform cross-section has a resistance of R Ω. What would be the resistance of a similar wire, made of the same material, but twice as long and of twice the diameter?
Friday, February 17, 2017 by michelle

Science
A silver picture frame has a volume of 5.97 cubic centimeters and a mass of 59.7 grams
Friday, February 17, 2017 by Gabby

LIFE SCIENCE
WHY IS A SPOROPHYTE CALLED A SEMI-PARASITE
Friday, February 17, 2017 by KENT

science
compute the average velocity in the following two cases: you walk 73.2m at a speed of 1.22m/s and then run 73.2m at a speed of 2.80m/s
Friday, February 17, 2017 by thabisoc seekane

Political Science
Should the same impeachment process and standards be used for judges, justices, and presidents? Are the same process and standards used?
Thursday, February 16, 2017 by Alex

Science
During what phase of the moon can a lunar eclipse Occur
Thursday, February 16, 2017 by Smiley rainbow

Science
which one occurs more often lunar eclipse or solar eclipse? this is just a question i'v been thinking of
Thursday, February 16, 2017 by Savanna Reed

Science
The words to use are: crust, moving, lithosphere, asthenosphere, upper mantle, volcanoes, semisolid The ___1___, which includes the ___2___ and part of the ___3___, is divided into plates that carry all of Earth's lands and oceans. These plates float on a ___4___ layer of rock...
Thursday, February 16, 2017 by Ari

SCIENCE (Connexus)
how could tree rings from Bristlecone Pines support the theory that some areas have had periods of drought and flooding for hundreds of years?
Thursday, February 16, 2017 by Queen

science
It is new and old at the same time
Thursday, February 16, 2017 by rose

SCIENCE HELP
a bristlecone pine in the white house usually adds a new ring when which of the following occurs? a. earths daily rotation is complete b. the full moon causes a monthly high tide c. the new moon is visible from earths surface d. earths northern hemisphere is titled toward the ...
Thursday, February 16, 2017 by honk

Science
What does the Hertzsprung-Russell Diagram NOT plot? A. temperature and mass B. spectral class and absolute magnitude C. absolute magnitude and luminosity D. spectral class and temperature Is it B?
Thursday, February 16, 2017 by Dactyl

Science and Hurry!
The Gulf Stream current shown here makes the waters of the North Atlantic A) warmer. B) cooler. C) more dense. D) less nutrient rich.
Thursday, February 16, 2017 by JT

Earth Science
Slide 1 This is a cumulus cloud. Can you find four things on the word list that you can use to describe this cloud. Cumulus clouds consists of puffy tops, no rain expected, 3,000 ft. high, and flat bottoms. Slide 2 This is an example of towering cumulus clouds. Write down as ...
Thursday, February 16, 2017 by Sam

Science and Hurry!
How do ocean currents influence the climate of a place? A) They transport heat over large distances, affecting the wind that blows over the land. B) They bring cold water from the poles, reducing the temperatures along the coasts. C) They draw out moisture from the wind, ...
Thursday, February 16, 2017 by JT

Science and Hurry!
What causes land breeze and sea breeze? A) The differential heating of land and sea by the Sun results in the movement of air. B) Hot air from the sea blows over the land because there is a high pressure area over the sea. C) Cold air blows from the land over the sea because ...
Thursday, February 16, 2017 by JT

science
What can people do to reduce global warming?
Thursday, February 16, 2017 by Sarah

science
10. Which of the following is an effect of global warming? A) increased drought B) falling sea levels C) decreased coastal flooding D) glacier spreading
Thursday, February 16, 2017 by help me

science
what causes clouds to form?
Thursday, February 16, 2017 by Sarah

science
weather maps use isobar lines to show weather conditions. what is indicated by this?
Thursday, February 16, 2017 by help me

SCIENCE
CO+H2O ---->CO2+H2 IN THIS REACTION HOW TO I HAVE TO CANAVART CARBONIC ACID?
Thursday, February 16, 2017 by manjanagouda.patil

physical science
A 15kg piece of mass suspended from a hook in the ceiling is pulled aside by a horizontal string until the supporting string makes an angle of 30 with the vertical .draw a vector diagram showing all the force acting on the piece of mass
Thursday, February 16, 2017 by Veronica molapo

Science, please! help!
1. How does sea-floor spreading occur? a.New materials are being added to the atmosphere. 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 feature form the ...
Wednesday, February 15, 2017 by Vanessa P.

Science
Heat and pressure deep beneath the Earths surface can change any rock into A) chemical rock B) gemstone C) metamorphic rock D) sedimentary rock
Wednesday, February 15, 2017 by Zack

Science, Health
Are calories the only difference between eating 100g of chips and skittles vs. eating 100 g of fresh fruit? What are some other things that you think should be considered?
Wednesday, February 15, 2017 by person

Social studies
Why the scientific method is better than Aristotelian science and divine Biblical knowledge..? about Galileo on Trial
Wednesday, February 15, 2017 by unknown

science
what is the humidity level of the dew point?
Wednesday, February 15, 2017 by help me

science
what happens to air temperature as altitude increases?
Wednesday, February 15, 2017 by help me

science
What the lines making a circle around the high-pressure area indicate. please sombody help
Wednesday, February 15, 2017 by susie

science
if there is a low pressure area developing over warm water, what type of storm is most likely to form?
Wednesday, February 15, 2017 by help me

science
Compare lunar and solar eclipses and answer the following questions: How does a solar eclipse happen? How does a lunar eclipse happen? Which one occurs more often?
Wednesday, February 15, 2017 by ferraris race

Science
When the North Pole is tilted toward the Sun, which hemisphere will have the summer season? Northern Hemisphere - June
Wednesday, February 15, 2017 by Marie

science
Which of the following is a reason to use parallel sentence structures in a literary analysis essay?
Wednesday, February 15, 2017 by pamela

Science
Lead(ll) Iodide can be produced from the reaction of Lead(ll) nitrate and potassium Iodide.What mass of lead(ll) iodide is produced when 50.0 mL of each solution is combined,forming a 0.750 M Solution of potassium nitrate? Please help me to solve this problem thank you
Wednesday, February 15, 2017 by Christ

Science
An insect of mass 20g crawls from the centre to the outside edge of a rotating disc of mass 200g & radius 20cm. The disc was initially rotating at 22.0 rad/s. What will be it's final angular velocity? What is the kinetic energy in the system?
Wednesday, February 15, 2017 by Jitender

Science
A truck of mass 2000kg moving on a highway experiences an average frictional force of 800N. If it's speed increases from 25m/s to 35m/s over a distance of 500m what is the force generated by the truck .
Wednesday, February 15, 2017 by Jitender

Science
A bullet of mass 20g, travelling at a speed of 350m/s, strikes a steel plate at an angle of 30° with the plane of the plate. It ricochet off at the same angle at a speed of 320m/s. What is the magnitude of the impulse that the steel plate given to the projectile? If the ...
Wednesday, February 15, 2017 by Jitender

Science
A box of mass 50kg is placed on an inclined plane. When the angle of the plane is increased to 30°, the box begins to slide downward. Calculate the coefficient of statics friction b/w the plane and box . Draw the free body diagram .
Wednesday, February 15, 2017 by Jitender

Science(chemistry)
Some students believe that teachers are full of hot air. If I inhale 2.2 litres of gas at a temperature of 18 degree Celsius and it heats to a temperature of 38 degree Celsius in my lungs,what is the new volume of the gas?
Tuesday, February 14, 2017 by Arthur

science
determine the number of grams of NH4CL that will dissolve in 100 grams of water at 25 Celcius.
Tuesday, February 14, 2017 by Anthony Harten

Science
What is a cation?
Tuesday, February 14, 2017 by Peter Pan

Science
what are the similarities between thermal energy and electrical energy
Tuesday, February 14, 2017 by Aira Orbeso

Physical Science
A delivery man pushes the button to ring the doorbell. Which of the following forms of energy is not involved in this process? electrical sound mechanical gravitational my answer is gravitational
Tuesday, February 14, 2017 by Steve

Science
describe what happens, at the molecular level, during melting.
Tuesday, February 14, 2017 by Joy

science
calculate the maximum height?calculate how long ? land on the ground?
Tuesday, February 14, 2017 by Nokulunga

Science 6
Renny noticed that after oiling his skateboard wheels, it was easier to reach the speeds he needed to perform tricks. How did the oil help? A:The oil reduced friction between the moving parts of the skateboard. B:the oil increased the friction between the moving parts of the ...
Tuesday, February 14, 2017 by Jaden

Science
A 60-kg cheetah reaches a speed of 30m\s as it chases its prey. What is the kenetic energy of the cheetah?
Tuesday, February 14, 2017 by Serafina

Physical Science
An elephant drags a tree trunk along a rough horizontal surface by means of an attached rope which makes an angle of 30° with the horizontal. The force in the rope is 4 000N. CALCULATE the horizontal component of the force exerted by the rope on the tree trunk
Tuesday, February 14, 2017 by Angie

Science
How many grams of ammonium nitrate nedd to be added to 500g of water so that the freezing point becomes -8.3 °C?
Tuesday, February 14, 2017 by Christ

Physical Science
Like water, hydrogen fluoride, HF, and ammonia, NH3, have relatively high boiling points. Explain. A.The polar molecules of each of these materials have relatively strong attractions for themselves, which translates to relatively high boiling points. B. Since these molecules ...
Monday, February 13, 2017 by Hannah

Physical Science
If an element has a +1 positive charge and the following chemical symbol, how many electrons does it have? 17 on top, 6 on bottom, Oxygen (O) A. 7 B. 17 C. 5 D. 18
Monday, February 13, 2017 by Hannah

Physical Science
Why is metal shiny? A. The electrons absorb each light wave. B. The loose electrons reflect most wavelengths of light. C. The electrons emit light due to electronic excitation. D. The electrons transmit most wavelengths of light. (I think the answer is B, but I am not positive)
Monday, February 13, 2017 by Hannah

Science
Plants use nutrients that_______ adds to soil. 1.bedrock 2.sand 3.loom 4.humus I think it's humus.
Monday, February 13, 2017 by Helppp

Science!
What changes would a cold front bring to a warm, dry area? A)extended period of rain B)several gray skies C)dry and asunny skies D)rain or thunderstorms I think it is either a or d but I am leaning more to a, so please help!
Monday, February 13, 2017 by JT

science
a body moving with an inertia velocity of 30m/s accelerate uniformly at a rate of 10m/s until it attends a velocity of 50m/s.what is the distance covered during this period?
Monday, February 13, 2017 by god'scare victor

Science/Weather
Satellite images help meteorologists in all the following ways except: a) monitoring changes in the strength of storms b) locating areas of high and low pressure systems. c) predicting rainfall amounts d) recording daily high and low temperatures. I think the answer is c or d...
Monday, February 13, 2017 by HiHi12345Kate

Science 6
Weather maps use isobar lines to show weather conditions. Which of the following info is indicated by these lines? A:high- and low- pressure areas B:high and low temperatures C:precipitation level D:cloud formation I think the answer is A. Thank you
Monday, February 13, 2017 by Jaden

science
What is the percent mass of calcium in a calcium supplement if 1.28-g of calcium carbonate is extracted from a 2.72-g pill?
Sunday, February 12, 2017 by soso

science
A body starts from rest, the ratio of distances travelled by the body during 3rd and 4th seconds is -
Sunday, February 12, 2017 by uma

Science
A pool ball leaves a 0.6 m high table with an initial horizontal velocity of 2.4 m.s.calculate horizontal and vertical velocity and time taken for the pool ball to fall to the ground
Sunday, February 12, 2017 by Memos

Science
To what temperature must a given mass of Nitrogen at zero degree celsius be heated to double its volume and pressure?
Sunday, February 12, 2017 by Gladys

science
Jane can still pump air in the party balloon even through it is already inflated.What explains this phenomenon?
Saturday, February 11, 2017 by Bea

Science
1) How does the pH of a solution affect its solubility and structure of weak organic acids and bases, such as proteins and nucleic acids? 2) Why would a zipper or a Velcro strip be a good analogy to weak interactions between biological molecules? Thank you!
Friday, February 10, 2017 by Tenshi

science
why did scientists think that proteins were the genetic material and not nucleic acids?
Friday, February 10, 2017 by Hasan

Science
What is the molar concentration of water in a solution of 10mM glucose? What types of ions are formed when water dissociates at room temp? Thank you!
Friday, February 10, 2017 by Tenshi

Political Science
What are some pros and cons to privatizing the U.S Postal Service?
Friday, February 10, 2017 by Jane

Science
How does a non metal behave chemically? Gimme an example
Friday, February 10, 2017 by Mileena

Math
Suppose 3 student change their vote from math to science describe how the frequency gable would change
Friday, February 10, 2017 by Tinoi

math (Ms. Sue plz help)
Plz help my dad dose have time for me my mom die when i was a little girl plz do help me and i am not lieing a 4x4 grid with 5 blocks shaded (1 point) one over five, 25% *** five sixteenths, 31.25% one over four, 20% one over four, 25% 2. Model 32% on a 5 × 5 grid. (1 point) ...
Friday, February 10, 2017 by tita

Science
1. True or False: If the net force of an object is 0 N, the forces are considered unbalanced. A.)True B.)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 ...
Friday, February 10, 2017 by Voldemort

Honors Physical science
Lesson 13 force and motion unit test. I need 1-62
Friday, February 10, 2017 by Cjsocool

Science
How much work is done in moving a 25lb. load a distance of 7 feet?
Friday, February 10, 2017 by Alexander

Science
The force of gravity of objects on the moon is approximately one-sixth of their value on Earth. Joe's weight on the moon is 124 N. What will Joe's mass on Earth be?
Friday, February 10, 2017 by Jessica

Science
A box weighing 20lb. is being pushed up an incline. If the angle of incline was 90° to the ground, what effort would be needed to push the mass? I don't get how to get the effort if an angle was in the problem.
Friday, February 10, 2017 by Christian

Science
The force of gravity of objects on the moon is approximately one-sixth of their value on Earth. Joe weighs 7633 N on earth. What will Joe's mass on the moon be?
Friday, February 10, 2017 by Jessica

Science
It is 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.
Friday, February 10, 2017 by Dani

Science
although electromagnetic waves differ in the wavelengths they all travel at the speed of light which is A.300,00km/s B.6000km/h c.100km/s d.10,00km/s A rocket is a motor that can urn fuel without requiring A.water B.air c.electricity d.fire
Friday, February 10, 2017 by Anonymous

Science
Teachers need a better way to give feedback to students. Writing on everyone's paper takes a lot of time,even though it is effective. Students and teachers need a better way.
Friday, February 10, 2017 by Coco

Science
Five criteria for decision making matrix "teachers need a better way to give feedback to students."
Friday, February 10, 2017 by Coco

Science
When sodiun is placed in water,it reacts violent to produce hydrogen gas and form sodium hydroxide solution. write a balanced chemical equation for this reaction
Friday, February 10, 2017 by Boren

Science
Why the bulb glows when the electric current passes through it?
Thursday, February 9, 2017 by Brajesh

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