# Science

## Recent Questions

science
how do you describe a scale im doing a portfolio and I don't know how too describe a scale please help me!!

Science
Air is compressed until a small piece of cotton is ignited. From a standpoint of thermodynamics what is Happening at a molecular level? Energy cant be created of destroyed?

Science
An object mass m1 falls from a height of h1. a. Write a formula for the velocity of the object just before it stikes the ground in terms of g,m1,and h1. b. Write a formula for the velocity of the object at the half way point in terms of g,m1, and h1.

Science
1. A ball is thrown 15 m/s at an angle of 60. How high does the ball go? 2. A ball rolls off a table going 8 m/s. If the table is 1.8 m tall, how far away does the ball land?

Science
A student rides his bike off the roof of the high school horizontally at 8 m/s that is 12.5 m high. 1. How far from the base does the object land? 2. What is his y-direction velocity just before it strikes the ground?

science
why is the use of fossil fuels not a long term solution to the worlds energy needs.

science
What is the momentum of a 20.0 kg scooter traveling a 5.00 m/s?

science
this is a follow up question from my last one with the exact question If you dissolve 200 g of salt in 20 l of water, what is the density of that solution of salty water? Hint: In this particular example, assume that the total volume doesn’t change when salt is added to ...

Math science
A camp has food stock for 500 people for 70 days.if 200more peole join tha camp how long will tha stock last

science
If I dissolve 200g in 20 litre of water what is the density of the salty water. please help

science
According to the periodic table, all of the following are metals except ? A) Sodium (Na) B) Zinc (Zn) C) Fluorine (F) D) Calcium (Ca)

science
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 that the group 1 alkali metals b. They have...

Science
Which of these is found inside the solar system? A) Moon B) Nebula C) Galaxy D) Black hole

chemistry, science
how many moles of he atoms are there in 0.02g of he?

science
an electron is projected horizontally at a speed of 3x10^6 m/s into a uniform electric field 200 N/C produced by two charged plates of width 0.1m (a) find the a cceleration of the electron in the elec field.(b) finn the time takes to travel through the electric field.(c) what ...

Science
Which material is the densest air,water,plastic,or iron

Science
Do light and sound travel at the same speed through solids, liquids, and gasses? What are the effects of light and sound traveling through different objects?

Science
4.9 gm of H2SO4 is mixed with Water to form 5 litres of aqueous solution. Findits concentration. (Molecular weight of H2SO4 is 98 gm/mole)

Science
1. The line on the graph below represents an object that is: A: Moving at a constant speed B: Increasing its speed C: Decreasing it's speed D: Not moving at all 2. To determine the acceleration of an object moving in a straight line, you must calculate the change in its speed ...

Science 6
during the process of photosynthesis, plants convert carbon dioxide and water into glucose. Covalent bonds hold the glucose molecules together. the energy stored in these covalent bonds is called? A:nuclear energy. B:thermal energy. C:electrical energy. D:chemical energy. I ...

Engineering Science N4
A box of books has a mass of 46kg and is being towed by a rope which is oriented at 15 degree to the horizontal at a point where it is tied into a knot. If the pulling force is increased until the box begins to slide, determine the box's initial acceleration if the coefficient...

Science
CeCl3 is having Ca conntent 12 g/L,If we try to pricipitate Ce2(CO3)by using 1.0M Na2CO3,what is the Ca impurity level in the fianl Ce carbonte and how much pH we have to maintain to control Ca imprurity in the final out put?

Science
Calculate the time needed for a net force of 5N to change the velocity of a 10kg mass by 2m

Science
How do the spaces between particles affect viscosity?

Science
How did Rutherford come to the conclusion that most of the space in atoms is empty?

Science- Earth
Under which circumstances do neap tides occur? HELP NEED ASAP!!

science
1. When Mendeleyev arranged the elements into the periodic table, he found that elements with fell into groups on the table A. the same mass B. similar size C. Similar properties D. The same color 2. Every element has its own atomic number. The atomic number is the number of ...

Science
Describe th flow of blood in the human body, including through each of the four chambers of the heart. Explain how the blood changes as it moves on locations in the body i have been stuck on this for almost 3o minutes i need help :)

science
Consider a point charge with q = 1.510-8 C. (a) What is the radius of an equipotential surface having a potential of 30 V? (b) Are surfaces whose potential differ by a constant amount (1.0 V) evenly spaced in radius

Science HELP!!! FAST!!!
24. Many people who care about conserving natural resources would choose to use wind energy to power their homes. However, wind power is not an option for people in many parts of the country. Explain what the benefits of wind power are and why it is not available to everyone ...

science
A solid weighs 100g in air,75g in water and 70g in oil.Calculate the relative density of oil.

social science
which places or countries are located at 20 degrees south and 20 degrees east?

Science
How are the primary pigments related to the primary colors? The primary pigments are: A. Complementary to the primary colors B. Associated with the primary colors C. Unrelated to the primary colors

science
calculate the amount of nitrogen required for making 70g of ammonia

Science
What is a natural satellite?

Science
What are constellations?

Science
Do all the stars in the sky move? Explain

Science
What animal is on top of the food chain

Science
Are euglena unicellular or multicellular? They are unicellular

Science
If a nickel is dropped from a building and no air resistance is present,how does the energy of the nickel change?

Science
If a nickel is dropped from a building and no air resistance is present,how does the energy of the nickel change?

Science
What chemical equation would represent methane (CH4) burning in the presence of oxygen gas (O2) to form water and carbon dioxide? (Make sure it's balanced)

science
you added 2ml of protein, 3ml of water, and 4ml of dye. how will you prepare blank for the experiment

Science
Ozone is known to cause respiratory problems in humans and to damage plants. However, the ozone layer also protects Earth. Explain the locations ozone can be found, how ozone is helpful, how it is harmful, and what causes the depletion of the ozone layer.

science
A car travels 70km on 20 litre of petrol.How far could that car travels on 230 litres of petrol

science
if a dentist chair weighs 1600N and is raised by a large piston with a cross sectional area 75.0cm2, what force must be exerted on a small piston of crosssectional area 3.75cm2 to lift the chair

Science
You have been challenged to lift a weight of 200 kg from the floor.Your challenger has the same task and also lifts a 200 kg from the floor but they take longer time to do so.Who has completed more or less work?Explain.Who has used more power?Why?

Science
1. Which of the following is an example of matter A.Leaves B.Shadows C.Light from the sun D.Sound<--- 2.Which of the following IS an Example of a chemical property of matter A.ability to melt B.ability to frezze<--- C.Ability to Break D.Ability To React 3. The physical ...

Science
You have been challenged to lift a weight of 200 kg from the floor.Your challenger has the same task and also lifts a 200 kg from the floor but they take longer time to do so.Who has completed more or less work?Explain.Who has used more power?Why?

Science
How many moles of mercury will be produced by electrolyzing 1.0M Hg(NO3)2 solution with a current 2.00A for 2 hours.

science
A gardener holds a hose 0.75m above the ground such that the water shoot out horizontally and hits the ground at a point 20m away.What is the speed with which the water leaves the hose?

Science
density of wood that is 20 cm below water and 60 cm above water

science
what are all the types of clouds

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?

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

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?

Science
What is methanol?

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

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.

science
writing balanced chemical reaction of K2CO3 (s) with HCl (aq)??

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

SCIENCE
Calculate the mass of caco3 required to liberate 10liters of co2 at stp?

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?

Math
Rachel answer 20 out of 25 questions correctly on her science test what percent of the questions did she answer correctly

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 ...

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)

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)

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)

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)

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)

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.

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 ...

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?

Science
A silver picture frame has a volume of 5.97 cubic centimeters and a mass of 59.7 grams

LIFE SCIENCE
WHY IS A SPOROPHYTE CALLED A SEMI-PARASITE

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

Political Science
Should the same impeachment process and standards be used for judges, justices, and presidents? Are the same process and standards used?

Science
During what phase of the moon can a lunar eclipse Occur

Science
which one occurs more often lunar eclipse or solar eclipse? this is just a question i'v been thinking of

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...

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?

science
It is new and old at the same time

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 ...

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?

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.

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 ...

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, ...

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 ...

science
What can people do to reduce global warming?

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

science
what causes clouds to form?

science
weather maps use isobar lines to show weather conditions. what is indicated by this?

SCIENCE
CO+H2O ---->CO2+H2 IN THIS REACTION HOW TO I HAVE TO CANAVART CARBONIC ACID?

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

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 ...

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

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?

Social studies
Why the scientific method is better than Aristotelian science and divine Biblical knowledge..? about Galileo on Trial

science
what is the humidity level of the dew point?

science
what happens to air temperature as altitude increases?