How could the development of a smart grid help protect the environment? a. a smart grid uses only renewable energy sources b. a smart grid burns fossil fuels without producing pollution c. a smart grid connects nonrenewable energy sources, making them renewable d. a smart grid...
Friday, November 18, 2016 by qwerty
"The Enlightenment and the Scientific Revolution were twin explosions in thinking that made the 17th and 18th centuries one of the most exciting and dynamic eras in European history. People cam to believe the power of human reason apart from the guidance of religion. ...
Friday, November 18, 2016 by Miranda
A solution of aqueous ammonia contains 28.0% NH3 by mass. the solution has a density of 0.898g/mL. calculate the volume of this solution required to make 425mLof 0.320M NH3 solution.
Friday, November 18, 2016 by luke
How can geologists identify different types of ammonites? A. by the times of fossilization B. by the size of their gills C. by what they ate at the time D. by differences in their shells
Thursday, November 17, 2016 by Macie
_____ is useful for dating very old rocks because it has a half-life of 1.3 billion years. A. thorium-232 B. potassium-40 C. uranium-235 D. carbon-14 is the answer D?
Thursday, November 17, 2016 by Kalie
What happens to the mass of a sample containing a radioactive element during its half-life? A. The mass decreases by half. B. The amount of mass is doubled. C. Eventually there is no mass at all. D. The mass remains the same.
Thursday, November 17, 2016 by Kalie
calculate the number of kilojoule necessary to raise the temperature of 60 gram of aluminium from 35 degree Celsius to 55 degree Celsius.Molar capacity of aluminium is 24 joule per mole per Kelvin?
Thursday, November 17, 2016 by Kausar
Which type of energy would the toy have if you pushed it and held the spring in the toy? F) electrical G) kinetic H) potential of I) thermal? ( there is a spring in the toy) I think it is potential energy since the spring is going down.Right?
Wednesday, November 16, 2016 by alessandra
Science (Stoichiometry with Gasses) (Chemistry)
If 1.00 kg of methane (CH4) is burned completely (in excess O2) and the CO2 produced is collected at 20°C and 1.00 atm, what volume (L) will this CO2 occupy??
Wednesday, November 16, 2016 by Ray
A car starts from an initial velocity of 10m/s and accelerates at 2.5m/s².how long will it take the car to reach a speed of 40m/s.. How far doea the car travel during this time?
Wednesday, November 16, 2016 by Anonymous
5. Suppose a skydiver (mass = 75 kg) is falling toward the Earth. When the skydiver is 100 m above the Earth he is moving at 60 m/s. At this point calculate the skydivers .
Wednesday, November 16, 2016 by jeremiah
Science Ms. sue help
what is the function of a cell wall A) to Protect and support the cell B) to preform different functions in each cell C) to prevent water from passing through the cell D) to prevent oxygen from entering the cell. Help!!!!
Tuesday, November 15, 2016 by valerie
Which of the following may occur during metamorphism? A. The rock becomes less compact. B. Certain minerals may recrystallize. C. Crystals may grow smaller. D. The rock becomes less dense.
Tuesday, November 15, 2016 by Aralyn
HISTORY GOVERNMENT CCA
what characteritics do bureaucracies share? check all that apply Formal rules generalization clearly defined goals chain of command elected staff which of the following is part of the executive branch bureaucracy? the president's cabinet the congressional budget office the...
Tuesday, November 15, 2016 by A.A
The diagram shows the variation of air pressure from an alarm siren at particular instant. The speed of sound in the air is 340m/s. what is the period of alarm siren.
Tuesday, November 15, 2016 by RITIKA
I am doing an Animal project , I need a picture to show how an animal had bilateral symmetry! I couldn't find any pictures that could actually show that. Can you pleas help me? Thank you
Monday, November 14, 2016 by Melody
1) What characteristics do bureaucracies share? Select all that apply. A) formal rules** B) generalized jobs** C) clearly defined goals D) chain of command** E) elected staff 2) Which of the following is part of the executive branch bureaucracy? A) the president's cabinet ...
Monday, November 14, 2016 by Juliet
In the equation below, suppose 11 grams of Zinc (Zn) react with 12 grams of Hydrogen Chloride (2HCl) to form 16 grams of Zinc Chloride (ZnCl2) and an unknown amount of Hydrogen gas (H2). Zn + 2HCl ? ZnCl2 + H2 Based on the Law of Conservation of Mass, how many grams of ...
Monday, November 14, 2016 by Luc
Science (galaxies and universe)
Studying distant galaxies is described as looking back into the past. What does this mean? (use terms light year, distance, and time in your answer)
Sunday, November 13, 2016 by KINA
6th grade science PLEASE HELP DOING THIS RIGHT NOW
why are capillaries and not arteries or viens not found in alveoli,nephrones,and villi A.vessels must be small so that very little blood enters these tissues B.vessle must be narrow so that very smal moluculescan reach these tissues C.vessls must be light wieght so that way ...
Sunday, November 13, 2016 by krystina
a 0.5kgball falls into a heap of sand from a height of 10m above the sand. it comes to rest 2.5m beneath the surface of sand. what is the average force exerted by sand on the ball.
Sunday, November 13, 2016 by Raveen
When iron metal reacts with oxygen, the reaction can form Fe203. The balanced chemical equation I think is right is 4 Fe + 302----2Fe203. So I have 4 moles of iron + 3 moles of oxygen creates 2 moles of iron oxide. I need to find the number of moles of oxygen that are needed ...
Friday, November 11, 2016 by Steve
4. Which of the following statements is true? A. Biodiversity provides additional resources that raise the carrying capacity of an ecosystem B. Biodiversity increases an ecosystems ability to withstand changes C. Biodiversity makes an ecosystem more difficult to destroy D. ...
Friday, November 11, 2016 by Embershy
1. An organism's particular role in its habitat, or when and how it survives, is called its A. Carrying capacity B. Ecosystem C. Competition D. Niche*** 2. Which of the following is an example of a predator adaption? A. A lion's pheromones B. A shark powerful jaws*** C...
Friday, November 11, 2016 by Embershy
I really need help on this project. I am not asking for all of the answers, I just need someone to explain what I should do for this experiment. And how to make a data table. Directions: 1. Design an experiment to support the hypothesis that light travels in straight lines ...
Friday, November 11, 2016 by Melinda May
An aeroplane of mass 5000 kg is flying at an altitude of 3 km. If the area of wings is 50 m^2 and pressure at the lower surface of wings is 60000 PA,the pressure on the upper surface of wings is
Friday, November 11, 2016 by Jaideep
Materials: Epsom salts (MgSO4), ammonia (NH4OH) small jar or cup measuring cup Procedures 1. Dissolve 1 teaspoon of Epsom salts in a half cup of water. 2. Add 2 teaspoons of ammonia to the Epsom salts solution and stir thoroughly. Record your observations. 3. Allow the mixture...
Friday, November 11, 2016 by Steve
I'm doing a lab report, and we are looking at an onion cell under a microscope. The teacher asks to explain why we put iodine on the sell. (ANSWER)= Cleaning it ?
Thursday, November 10, 2016 by I need Help Now
Question 1- how does a multicellular organism develop? A- the cells differentiate. B- The cells shrink. C- One cell grows bigger. D- The cells replicate to form exact copies. <<<<
Thursday, November 10, 2016 by PLS HELP QUICK DONT HAVE TIME
A 10 ohm, 20 ohm lamp and 12v battery are connected in a parallel. A current of 1.8 A passes through the battery and a current of 1.2 A passes through the motor. 1) Determine the current through the lamp. 2) Calculate the potential difference across the motor. 3) is this the ...
Thursday, November 10, 2016 by Tina
In a tennis match the player hits the ball to serve the ball travels 24m from the servers raquet to the opponents Raquet at an average speed of 40 meters per second.calculate the time taken
Thursday, November 10, 2016 by Alex
Unit 3 Test Multiple Choice Please select the correct response for the following questions. 1. What is the smallest part of all matter called? (1 point) * a. Element b. Atom c. Molecule d. Compound 2. Which of the subatomic particles is negative? (1 point) a. Nucleus b. ...
Thursday, November 10, 2016 by Becky
Science - Electrochemistry
In an experiment 0.0500 M AgNO3 was used to titrate 20 mL of 0.12 M NaCl solution. When silver electrode is used together with the pH electrode to measure potential at each point during the titration, the potential measured at equivalence point is 0.055 V. Unfortunately, a ...
Wednesday, November 9, 2016 by Sarah Lee
a bullet is shot from a springfield rifle with a speed of 3,015 ft/s. assuming the bullet moved at a constant velocity, what is the time required for the bullet to strike a target 4,146 meters away
Wednesday, November 9, 2016 by chris
I can't figure out some of them, and I need help! m - 7 < 6 1. m< -13 ** 2. m< 1 3. m< -1 4. m< 13 n - 8 > 5 1. n> 13** 2. n> 3 3. n> -3 4. n> -13 p + 5 < 10 1. p < -15** 2. p < 5 3. p < 15 4. p < -5 The science class is taking...
Wednesday, November 9, 2016 by HELPPPPPPPPPP
Four students dissolved 30g of salt in a 200ml solution of water.Each student heated his or her water solution to a different temperature ( Marcus had 10 and tyra had 25 Luis had 50 and Andrew had 75) which student most likely had the solution with the fastest dissolving rate ...
Tuesday, November 8, 2016 by Kate
Explain the process of succession Describe how changes in an ecosystem can affect organisms that live there Describe the amount of time needed for ecosystem recovery What are the dependent and independent variables? Independent: Dependent:
Tuesday, November 8, 2016 by Embershy
Which of the following correctly identifies active transport? A. Transport proteins move large molecules from areas of low. B. Transport proteins move large molecules from areas of low concentration areas of high concentration areas without the use of cellular energy. C.Small ...
Tuesday, November 8, 2016 by Ive
Science PLEASE PLEASE HELP
Which of these statements about saltwater is correct? Saltwater freezes at a lower temperature Saltwater freezes at a higher temperature Saltwater does not freeze at any temperature Saltwaters freezing point depends on the temperature of the ocean floor***** PLEASE HELP ME
Tuesday, November 8, 2016 by ovais
Science HELP PLS
1. What is a Genetic Mutation? A. the process of decreasing chromosome numbers to half of what the parent cell has B. the copying of DNA to form identical daughter cells C. a permanent change in an organisms genetic code D. a fusion of egg and sperm cell to produce a new...
Tuesday, November 8, 2016 by Jia