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March 24, 2017

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Homework Help: Science

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Recent Science Questions

Science
hearing rattles from a snake, a boy make two rapid displacements of magnitude 1.8m and 2.4m in sketches show how the two displacements might add up to give magnitude of
Wednesday, March 1, 2017 by Anonymous

Science
When calculating delta Tsample,why is th initial temperature taken to be 100 degrees Celsius
Wednesday, March 1, 2017 by Lydia

Science
Why is the weight of an object less on the moon than on Earth?
Tuesday, February 28, 2017 by RD

science
The effects of electricity can be explained by the structure of the _______?
Tuesday, February 28, 2017 by Anonymous

Science
A pendulum is made with a bowling ball as the bob and a wire attached to the ceiling, as shown in the illustration below. The person in the illustration pulls the bowling ball back until it touches his nose, then releases the bowling ball. Assume that he does not move. 1....
Tuesday, February 28, 2017 by Sue

Science
What percentage of the energy from the grass would the hawks get in the trophic level pyramid of a food chain
Tuesday, February 28, 2017 by Mariela

Science
how much work is done on a 50kg cart that is pushed 10m at a constant rate of 5m/s^2
Tuesday, February 28, 2017 by Sue

Science
A pendulum is made with a bowling ball as the bob and a wire attached to the ceiling, as shown in the illustration below. The person in the illustration pulls the bowling ball back until it touches his nose, then releases the bowling ball. Assume that he does not move. 1....
Tuesday, February 28, 2017 by Sue

Science
A pendulum is made with a bowling ball as the bob and a wire attached to the ceiling, as shown in the illustration below. The person in the illustration pulls the bowling ball back until it touches his nose, then releases the bowling ball. Assume that he does not move. 1....
Tuesday, February 28, 2017 by Sue

Science
A pendulum is made with a bowling ball as the bob and a wire attached to the ceiling, as shown in the illustration below. The person in the illustration pulls the bowling ball back until it touches his nose, then releases the bowling ball. Assume that he does not move. 1....
Tuesday, February 28, 2017 by Susie

Science
A pendulum is made with a bowling ball as the bob and a wire attached to the ceiling, as shown in the illustration below. The person in the illustration pulls the bowling ball back until it touches his nose, then releases the bowling ball. Assume that he does not move. 1....
Tuesday, February 28, 2017 by Susie

Science
How much power is lifted if a person lifts 60N weight up 2 meters in 10 seconds?
Tuesday, February 28, 2017 by Susie

science
why dos buying food that is grown in your local area help prevent loss of biodiversity ??????
Tuesday, February 28, 2017 by HELP ME ASAP PLS

SCIENCE HELP ASAP
1. in an atom, electrons_____ 2. dot diagrams are used to represent_______ 3. the maximum number of electrons in the second energy level of an atom is________
Tuesday, February 28, 2017 by schweppes

Science
The weight of an object is the product of its mass, m, and the acceleration of gravity, g (where g=9.8 m/s2). If an object’s mass is m=58.5 grams, what is its weight? Same goes to 45.93 grams. If you could answer as soon as possible that would be great!
Tuesday, February 28, 2017 by Davye

Science
An eagle flying along a horizontal path drops a small snake from a height of 6.5 m while travelling 5.0 m/s. How far does the snake travel horizontally before it hits the ground below? G: R: E: S: A:
Tuesday, February 28, 2017 by Michael

Science
What do we mean when we say, "The speed of the car is 90 km/h."?
Tuesday, February 28, 2017 by Chris

Science
What is the identity of the precipitate that forms when 70 mL of 0.3 M BaCl2 reacts with 65 mL of 0.35 M Na2CO3
Monday, February 27, 2017 by Jacob

physical science B
I have to build a roller coaster with 3 hills. Hill A is 15 inches high,it drops down to 3 inches, rises to 8 inches, drops again to 5 inches and rises a last time to 3 inches before dropping off. My question is when using a tennis ball as the car.. 1. What is the initial ...
Monday, February 27, 2017 by Kristy

Science
A car is traveling at 8.9 m/s (20mph) in a school zone. A child darts in front of the car. Ignoring reaction time, the car can accelerate (brake) at -4.57 m/s. -How long will it take for the car to stop? -How far will the car travel in that time?
Monday, February 27, 2017 by Elizabeth

science
Earth's energy sources include both renewable and nonrenewable resources. name at least three sources of energy that could be used in your house. then describe the ideal energy source for generating most of your home's electricity, and explain why you choose that source
Monday, February 27, 2017 by shadow

SCIENCE
A BALL OF MASS 2KG FALLS FROM REST FROM A HEIGHT OF 200M.CALCULATE ITS KINETIC ENERGY AFTER FALLING A DISTANCE OF 50M?
Monday, February 27, 2017 by GODSWILL VICTOR

Math,science
The 5th term of an arithmetic progression is 23 and the 12th term is 37.find the third term and common different
Monday, February 27, 2017 by Glory

Science
Radioactivity is produced when unstable nuclei___ 1) bond together 2) break apart ***** 3) become cooler 4) expand I need help please
Monday, February 27, 2017 by Bobby flae

science
The question is: Calculate the pH of a solution that results from 50.0 ml of 0.15mol/L HCOOH with 75.0ml of 0.13mol/L HCOONa. I know I need to use the henderson-hasselbalch equation with the pka being 3.74 but I'm not sure how to get the ratio to plug in.
Sunday, February 26, 2017 by Manika

Science
A physics student stands in an 64th floor. The students weights 810 N. What is his mass and normal force? Mass is 83? normal force is 810?
Sunday, February 26, 2017 by Boberto

Science
2. A cable pulls a 15.0 kg crate at constant speed across a horizontal table.The tension in the cable is 60.0 N. 1. What is the frictional force and normal force?
Sunday, February 26, 2017 by Boberto

Science
1. A truck is traveling 20 m/s to the left and bill is moving at 4 m/s left. If you are in Postion A what velocity do you see bill moving at?
Sunday, February 26, 2017 by Boberto

science
how do you describe a scale im doing a portfolio and I don't know how too describe a scale please help me!!
Sunday, February 26, 2017 by kakashi hatake

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?
Sunday, February 26, 2017 by Boberto

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.
Saturday, February 25, 2017 by Boberto

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?
Saturday, February 25, 2017 by Boberto

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?
Saturday, February 25, 2017 by Boberto

science
why is the use of fossil fuels not a long term solution to the worlds energy needs.
Saturday, February 25, 2017 by Rhonda

science
What is the momentum of a 20.0 kg scooter traveling a 5.00 m/s?
Saturday, February 25, 2017 by rhonda

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 ...
Saturday, February 25, 2017 by dean

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
Saturday, February 25, 2017 by Rahul kumar

science
If I dissolve 200g in 20 litre of water what is the density of the salty water. please help
Saturday, February 25, 2017 by dean

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)
Friday, February 24, 2017 by Help please

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...
Friday, February 24, 2017 by Help me

Science
Which of these is found inside the solar system? A) Moon B) Nebula C) Galaxy D) Black hole
Friday, February 24, 2017 by JT

chemistry, science
how many moles of he atoms are there in 0.02g of he?
Friday, February 24, 2017 by anonymous

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 ...
Friday, February 24, 2017 by rahidul

Science
Which material is the densest air,water,plastic,or iron
Thursday, February 23, 2017 by John

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?
Thursday, February 23, 2017 by Ana

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)
Thursday, February 23, 2017 by Shreyash

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 ...
Thursday, February 23, 2017 by Reeces

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 ...
Thursday, February 23, 2017 by Jaden

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...
Thursday, February 23, 2017 by Paul

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?
Thursday, February 23, 2017 by Chiranjeevi

Science
Calculate the time needed for a net force of 5N to change the velocity of a 10kg mass by 2m
Thursday, February 23, 2017 by Navya

Science
How do the spaces between particles affect viscosity?
Wednesday, February 22, 2017 by Anonymous

Science
How did Rutherford come to the conclusion that most of the space in atoms is empty?
Wednesday, February 22, 2017 by Nnek hahs

Science- Earth
Under which circumstances do neap tides occur? HELP NEED ASAP!!
Wednesday, February 22, 2017 by kat

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 ...
Wednesday, February 22, 2017 by Help me

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 :)
Wednesday, February 22, 2017 by Bill Shrum

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
Wednesday, February 22, 2017 by Swaran

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 ...
Wednesday, February 22, 2017 by Agala

science
A solid weighs 100g in air,75g in water and 70g in oil.Calculate the relative density of oil.
Wednesday, February 22, 2017 by Gauri

social science
which places or countries are located at 20 degrees south and 20 degrees east?
Wednesday, February 22, 2017 by alina

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
Wednesday, February 22, 2017 by Anonymous

science
calculate the amount of nitrogen required for making 70g of ammonia
Tuesday, February 21, 2017 by vansh

Science
What is a natural satellite?
Tuesday, February 21, 2017 by Brajesh

Science
What are constellations?
Tuesday, February 21, 2017 by Brajesh

Science
Do all the stars in the sky move? Explain
Tuesday, February 21, 2017 by Brajesh

Science
What animal is on top of the food chain
Tuesday, February 21, 2017 by Andres ramirez

Science
Are euglena unicellular or multicellular? They are unicellular
Tuesday, February 21, 2017 by Ariana

Science
If a nickel is dropped from a building and no air resistance is present,how does the energy of the nickel change?
Tuesday, February 21, 2017 by Susie

Science
If a nickel is dropped from a building and no air resistance is present,how does the energy of the nickel change?
Tuesday, February 21, 2017 by Susie

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)
Tuesday, February 21, 2017 by Cara

science
you added 2ml of protein, 3ml of water, and 4ml of dye. how will you prepare blank for the experiment
Tuesday, February 21, 2017 by cindy

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.
Tuesday, February 21, 2017 by Unknown

science
A car travels 70km on 20 litre of petrol.How far could that car travels on 230 litres of petrol
Tuesday, February 21, 2017 by pratibha singh

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
Tuesday, February 21, 2017 by jalani

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?
Monday, February 20, 2017 by Susie

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 react<--- D.Ability To Break 3. The physical ...
Monday, February 20, 2017 by Cookie dough

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 ...
Monday, February 20, 2017 by Cookie dough

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?
Monday, February 20, 2017 by Susie

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.
Monday, February 20, 2017 by Neha

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?
Monday, February 20, 2017 by rhamlyn casis

Science
density of wood that is 20 cm below water and 60 cm above water
Monday, February 20, 2017 by Anonymous

science
what are all the types of clouds
Sunday, February 19, 2017 by donald trump

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

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