Science

Recent Questions

Science
Which of the following illustrates mechanical weathering? 1.Carbonic acid weathers marble and limestone. 2.As plants grow, they produce weak acids that slowly dissolve rock. 3. Oxidation causes weathering in rock. 4. Repeated freezing and thawing in rocks causes weathering. ...

6th Grade Science Experiment
Hi, forget my first post. Can someone please explain what a dependent and independent variable is? Thanks and I don't have too much time either.

science please help and explain asap
A rock of mass 5kg is pushed over the edge of a cliff which is 200m high 1.ignore air resistance and calculate the speed of the rock at the bottom of the cliff. In reality air resistance cannot be ignored. The rock eventually reaches terminal velocity of 30m/s 2.calculate the ...

6th Grade Science Help PLEASE!
Hi, so I did the coin drop experiment. I finished project, wrote my hypothesis, my data, my observations, and my conclusion. What I need help is that in this experiment I don't know which on is the independent and dependent variable. That's all I need. Can someone please help ...

Science
What is the momentum of a 2 kg rock moving at 3m/s?

Science
Describe the difference between the momentum between a tennis ball and a wrecking ball that is thrown at the same speed.

Science
Consider the carbon atom whose nuclear mass is 11.996amu.calculat mass defect when proton=1.00728amu,neutron=1.00867amu

Science
In the uranium mass 235,the binding energy was estimated as 3.0×10^-11Joules.Determine the energy released by 1g of uranium.

Science
The electron in a helium ion moves from a Bohr's orbit whose principal quantum number is 4 to another whose quantum number is 6.calculate the energy of transition in this process.

Science
Evaluate the value of the Bohr orbit in a hydrogen atom whose principal quantum number is 1.

Science
The assertion that 1g of uranium can produce energy equivalent to 10kg of coal implies that

Science
Which of the following characteristics x-ray photon emission? (a)electron capture (b)beta-decay (c)positron emmision (d)gamma-decay

Science
Which of these is odd in the series? (a)sodium (b)sulphur (C)plutonium (d)francium

Science
The equation of the reaction between 2 moles of proton and 2 moles of neutron producing Helium particles is a practical suggestion of (a)existence of neutral particle. (b)alpha-particles has no relationship with nucleus (c)electron is not part of helium. (d)nucleus is neutralize

Science
Which of these is not associated with camp ton effect? (a)when energy exceeds 1.02MeV. (b)energy of gamma-ray become less. (c)operative within the range of 0.6Mev and 4MeV of energy. (d)it doesn't result in low energy secondary radiation.

Science
The energy of transition of an electron from 5th to the 3rd Bohr orbit of a hydrogen atom

Science
The mass defect in a certain nuclear reaction is 0.108a.m.u.Determine the energy released in the reaction

Science
Element Y has a half life of 50days. How much of a 100mg of its sample will remain after 5 month?

Science
The most covalent of the chlorides; LiCL,BeCL2,MgCL2 and AlCL3 is (a)MgCL2 (b)AlCL3 (c)Licl (d)BeCL2

Science
The hydride of group VIA element are- Option (a)volatile covalent gases (b)volatile covalent solids (c)volatile covalent liquids (d)volatile ionic liquids

Science
1. A weatherman reports, "the storm waves are about 2 meters high and about 35 meters apart. "what properties of waves is the reporter describing? Frequency and wavelength Wavelength and wave speed***** Amplitude and wavelength Amplitude and frequency 2. Sound proof rooms take...

Science
Draw the position-time graph of a stationary body also draw velocity time graph of a stationary body

science
You would expect that an injection of an opiate drug into the __________ would activate dopamine neurons in the nucleus accumbens. A. ventral tegmental area B. medial septal region C. periaqueductal gray matter D. preoptic area My choice is C

science
A panic-prone person who ingests a(n) __________ would be expected to show increased anxiety. A. benzodiazepine agonist B. tricyclic antidepressant C. MAO inhibitor D. benzodiazepine antagonist is it A

Mia
A Screamingly Good Science Lesson Elizabeth Kibler 1Amusement park rides give us thrills, exhilaration, and delight. If you pay attention, these rides can give you something else—a science lesson. Roller coasters are amazing rides that can twist and veer until you scream; ...

Science
What does the electron shell rotate around?

Science
why is electricity is not sent in smaller voltages from the power station rather than substation? why does the sub stations smaller the high voltages, why aren't they sent in smaller voltages from the power station?

Science
Which sphere of the Earth system contains nearly all of Earth's mass? A. the geosphere B. the atmosphere C. the biosphere D. the hydrosphere

Pysics science
How much work is done when a bucket of mass 1.5kg with 10g of water in it is pulled up from the bottom of a well 8m deep? Take g=9.8m/s2 (a)100.3j(b)2000.5j(c)901.6j(d)453.7j

science
girl of mass 40kg having v 2m/s jumps on a stationary cart of mass 4 kg find the velocity of girl when the cart starts moving

science
a solutioohol mixed with 125 cu.cm of water find the concentrationn contains 4.5 cu.cm of alc

earth science
What is the most abundant fossil fuel? A:Coal B:Gas C:Wood D:Oil

Science
A Herculean bomber jet accepts 40kg of air per second at a velocity of 200m/s, burns 2kg of fuel at the same time,and releases exhaust gases at 600m/s relative to the bomber. find the thrust due to its engine.

Science
Every individual, including young people, can make decisions to use resources wisely. Use the terms reduce, reuse, and recycle to explain how the students in the image above can help minimize solid waste.

Science
a flask contain 25 ml of HNO3 solution which requires 30 ml of 0.2 M KOH to complete the reaction. calculate the concentration of KOH. HNO3+ KOH= H2O + KNO3

science
A light spring is initially used to suspend masses from the ceiling. When a 4.0 kg mass is attached to the spring, its length is 22.0 cm. When an additional 2.3 kg mass is attached to the bottom of the 4.0 kg mass, the spring's length measures 26.8 cm. Determine the spring's ...

Science
A block of weight 7.0N rest on a level floor. The frictional force between the block and the floor is 1.0N, A horizontal force of 1.4N is used to pull the block for 4s.what is the velocity of the block after this time?

science
If the half life- period of a radioactive element is 1600.After how many years will if remains 25% of his quantity

biology/science
What are the biological terms for the following 1.process in biotechnology that is used to make human insulin in a bacterial cell 2.white blood cells produce antibodies in response to pathogens

science
Fossil fuels are a. A natural resource b. Renewable c. Made from minerals d. Burned in hydroelectric plants

life science
give the biological term for the following 1.process in biotechnology that is used to make human insulin in a bacterial cell 2.white blood cells produce antibodies in response to pathogens

science plz help ms sue
Compare and contrast spiral and elliptical galaxies. (Make at least 2 comparisons.) plz help me with eclest what is to comparisons

Science
Provide three statements that demonstrate the importance of units when describing motion. Please help and thank you!! asap Ms.Sue?

science ms sue plz help
1. Which layer of the sun's atmosphere are you looking at when you look at an image of a sun? A) Photosphere B) Chromosphere C) Corona D) Prominence 2. What materials could have been found in a giant cloud that formed the solar system? A- hydrogen and helium B- hydrogen and ...

Science
A 45 N force is applied to a 9.6 kg object, what is it's acceleration?

Science
Why do people debate on fossil fuels? Is it based on how its used? Thanks

science
What does composition mean when you're talking about biotic and abiotic

science
What are some biotic items we do at home.. I only have the abiotic side.

science
Is a laptop biotic or abiotic?

Earth Science
Which of the following are you most likely to experience a-total solar eclipse b-total lunar eclipse c-full moon d-partial lunar eclipse? my answer is full moon

science
From the cosmic background radiation, what can scientists infer that the universe was like after the big bang? A. Very small B. Hot C. The same average temperature as it is today. D. Cooler than it is today. Is the answer C? Thank you for the help😊

science
Flight simulators are used to train new pilots because ____.

science
An illness caused by a protist is? protozoa is my answer i think is it right?

science
An illness caused by a protist is protozoa? True or False My answer is true am i correct?

science
A protostar has a high enough ___ to become a star. A. Volume B. Mass C. Temperature D. Brightness Is the answer B? Thank you

science
Which of the following is s major difference between elliptical galaxies and spiral galaxies? A. Elliptical galaxies have almost no gas or dust between starts. B. Elliptical galaxies vary more in shape than spiral galaxies. C. Spiral galaxies have almost no gas or dust between...

science
Why can certain stars sometimes be identified as eclipsing binary stars? A. They are brighter than any single star. B. They are all white dwarfs C. They become dimmer at regular intervals. D. They are cool red stars. Is the answer C?

science
A protostar has a high enough___to become a star. A. volume B. mass C. temperature D. brightness Is the answer B? Thanks in advance

Science
18. The human immune system produces ______________ in response to a vaccine, which later can bind to and destroy a pathogen if it invades. (1 point)

science
how many seconds does it take for Mercury to go from 0 degrees Celsius to 300 degrees Celsius? 1. 5 seconds 2. 10 seconds 3. 30 seconds 4. 357 seconds

Science
When you make a pedigree and it says Theos wife Mary is a purebred right-handed person what does purebred mean

science
Given the following reaction (it IS balanced), how many grams of CO2 are produced when 0.700 moles of toluene (C7H8) is allowed to completely combust? C7H8 + 9 O2 ¨ 7 CO2 + 4 H2O

Science
If a full moon occurred on April 1, what phase would you see on the 7th, 21st,4th,30th,and 14th of April

Science
In the ocean, there are area's where there are very few living things. _______ is the term that when this happens to a natural area.

Physical Science heat & temp. Chapter
How much heat in calories is required for (2.7 lb) of ice –200 F to be converted to water at 40 F?

science (chemistry)
why does the pH of the acid solution initially increase very slowly when metal is first added to the acid solution, but gradually increase at a faster rate as the reaction proceeds to completion? I thought it may be because the metal is just then being completely dissolved but...

Science
1. A weatherman reports, "the storm waves are about 2 meters high and about 35 meters apart. "what properties of waves is the reporter describing? Frequency and wavelength Wavelength and wave speed***** Amplitude and wavelength Amplitude and frequency 2. Sound proof rooms take...

science
How to calculate the mass of 17 ml of 2 mole of sulfuric acid?

science.......
1.a ball with a mass 2kg rests on an incline with an angle of 10 degrees. The ball is released to roll down the incline plane neglecting all friction: Determine the following: A.the loss in potential energy after it has rolled 12m. B. The kinetic energy C.the velocity after it...

engineering science n3
A train with a mass of 120Mg accelerates uniformly on a horizontal track.the resistance to movement is 5N per KN of the mass of the train. The force in the draw-bar of the locomotive is 80KN.calculate: 1.the force required for the constant speed. 2.the force that causes the ...

Science
What kind of energy is transferred in an energy pyramid

science
these are all very confusing for me 1. Explain why Earth and other planets were not solid when they formed during the beginning of the Precambrian, approximately 4,600 million years ago (MYA). What was this particular time period called, and why is this time period not really ...

Science(need help)
1) What evidence is there that the human species has been successful so far? Explain. 2) What environmental pressures in the past do you think were most important in shaping the human species as it exists today? 3) What environmental pressures exist now that you think may be ...

Science
How much current does a flashlight use if its battery supplies 3.0 Volt and the bulb has a resistance of 4.0 Alpha

science.......,,....
train with mass of 120mg accelerates uniformly on a horizontal track. The resistance to movement is 5N per kN of the mass of the train. The force in the draw-bar locomotive is 80kN Calculate a. The force required for constant speed b. The force that causes the acceleration c. ...

Science
1. What do bone marrow (the soft connective tissue that fills the internal spaces in bone) and the dermis (layer of the skin under the epidermis and over the hypodermis) have in common? (1 point) • They are both sites of new cell formation. • They both contain or are ...

science.......
An electric bulb is marked 220v60w. An ammeter in the circuit shows the bulb uses a current of 0.2727A. The bulb burns for an hour. Calculate the following: A. The electrical energy consumption B. The cost for the bulb to burn for one hour if the cost of electricity is 17.45 ...

Please help asap science
1. An electrical circuit consists of a battery with 2 cells,each with an EMF of 12 volts and an internal resistance of of 0.4 ohms,connected in parallel. An ammeter with an internal resistance of 0.15 ohms is connected in series with resistor Ra=2ohms and Rb=4ohms Calculate ...

science please help and explain asap
A train with mass of 120mg accelerates uniformly on a horizontal track. The resistance to movement is 5N per kN of the mass of the train. The force in the draw-bar locomotive is 80kN Calculate a. The force required for constant speed b. The force that causes the acceleration c...

science
A mixture of zinc and anhydrous zinc nitrate was heated in air, and its mass has not changed after this procedure. Calculate the mass frac-tions of the components in the mixture.

science 1 question
4. When a fan is turned on, it changes electrical energy into __________ energy. (1 point) motion magnetic gravitational*** electromagnetic

physical science
What is the amplitude of a longitudinal wave

science please help
1.a ball with a mass 2kg rests on an incline with an angle of 10 degrees. The ball is released to roll down the incline plane neglecting all friction: Determine the following: A.the loss in potential energy after it has rolled 12m. B.the velocity after it has rolled 12m. C.the...

science please help asap
1.a ball with a mass 2kg rests on an incline with an angle of 10 degrees. The ball is released to roll down the incline plane neglecting all friction: Determine the following: A.the loss in potential energy after it has rolled 12m. B.the velocity after it has rolled 12m. C.the...

Math
On Tuesday, Leslie spent 47 minutes on math homework, 39 minutes on science homework, 52 minutes on English homework, and 44 minutes on history homework. How much time did Leslie spend doing her homework on Tuesday?

Science
Which two elements represent the same family of the periodic table? Hydrogen Helium Lithium Fluorine Is it none??

Science
what is an isotope

Science
H2) -----> H^+ + OH^- Is this equation balanced

Science
what are some challenges to biodiversity

Science
I really need help with my science which is based on Galileo Galilei. I need information about his early life,education, his fun facts, his contributions,and how his contributions affect us. i got some information but i need help finding proper info. thanks

science please help asap
1.a train with a mass of 120mg accelerates uniformly on a horizontal track. The resistance to movement is 5N per kN of the mass of the train. The force in the draw bar of the locomotive is 80kN. Calculate A.The force required for the constant speed. B. The force that causes ...

science
1.a ball with a mass 2kg rests on an incline with an angle of 10 degrees. The ball is released to roll down the incline plane neglecting all friction: Determine the following: A.the loss in potential energy after it has rolled 12m. B.the velocity after it has rolled 12m. C.the...

science
100mL of oxalic acid (H2C2O4) requires 35mL of 0.04M KMnO4 to titrate it to the endpoint. calculate the molarity of the oxalic acid.

science
When the metal sample reacts with acid, the gas evolved will be collected over water; the gas is said to be "wet". What is the composition of the wet gas? How can the partial pressure of hydrogen be obtained from the total pressure of wet gas? From where will you obtain the ...

science
The solubility of sugar in water in room temperature is 204 g/ 100 ml. a) How much sugar will dissolve in 100 ml of water at room temperature? b) How much sugar will dissolve in 200 ml of water at room temperature?

science
The solubility of sugar in water in room temperature is 204 g/ 100 ml. a) How much sugar will dissolve in 100 ml of water at room temperature? b) How much sugar will dissolve in 200 ml of water at room temperature?

Science
Who have made god

Science
How much work do you do when you push a shopping cart with a force of 50N for a distance of 5M

science
The analysis of lead (Pb) in a sample of solder was carried out using atomic absorption spectroscopy as follows. 1.013 g of solder was completely dissolved in a small volume of nitric acid and the solution made up to 1.000 L with distilled water. A 50.0 μL aliquot of this...

Physical Science
A model electric train requires 12 V to operate. When connected to a household voltage of 120 V, a transformer is needed. If the primary coil has 500 turns, how many turns must the secondary coil have?

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