Science

Recent Questions

Science
a rock from a riverbed and a rock deep from undergroung. one is very smooth, and the other has a very rough edges. explain why each rock was proabley found in that location

science
if all members of a specie disappears, the species is said to be.. a.)extinct b.)endangered c.)threatened D.)keystone

Science
What would be a good way using the terms mass and weight to explain how to measure gold so it's the same on earth and on the moon?

Science
Why would the weight of gold be less on earths moon than it would be on earth?

science
Specific heat capacity of solid ethanol is 2.419 J/g C. Melting point temperature of ethanol is -114.4 C/ 158.8 K. Enthalpy of fusion of ethanol is 106.4 J/g. Specific heat capacity of liquid ethanol is 2.440 J/g C. 44.0 g of solid ethanol at -134.4 C is dropped into a Dewar ...

science
A cube of density 12kg/m cubed is placed in a Eureka tub and releases 0.40m cubed of water. A) What is the edge length of the cube? B) What is the mass of the cube?

science
As the moon revolves around the Earth, it also rotates on its axis. Why is it that the the same side of the moon is always visible from Earth?

Science
A rocket with mass 20000kg is launched straight upwards. the rocket experience an average drag force ( air resistance ) of 15000 N. What thrust force will be necessary for the rocket to maintain an acceleration of 4.5m/s square upwards?

Science
The man lifted the 15 pound weight 2 feet above his head. How much work was done?

science
A glass bottle has a volume of 1L and weighs 500g. When half filled with oil, it weighs 1750g. What is the density of the oil in the bottle?

Science
an object of size 3 cm is place 10 cm away from the convex lens find the position nature and size of the images it focal length is 7 cm.

Science
Mg3N2(s) + 6H20 = Mg(OH)2(s) + 2NH3(g) When 2 moles of H20 react How many grams of NH3 are produced ?

science help
In the water cycle, matter moves towards the pull of gravity during infiltration and evaporation transpiration and infiltration precipitation and infiltration evaporation and transpiration is it a

science help
Two scientists did the same experiment but arrived at different results. The scientists most likely did not have accurate data and information misunderstand each other's interpretations belong to different backgrounds did not have instruments to take accurate measurements

science
As a result of chemical or physical reactions when heating/cooking foods: 1.will it make certain fruits(example plums,durian,banana,apple) to change from sour to sweet or vice –versa? 2.will it help to make foods that has gone slightly bad to be safer for eating? Please also...

science
calculate the depth of salt water lake,if the pressure at its base is 16 times the atmospheric pressure.the density of salt water lake is 1,050kg m-3 and acceleration due to gravity is 10 ms-2.the atmospheric pressure is 10N cm-2

Science
A pistol of mass 2 kg fires a bullet of mass 50g. The bullet strikes a stationary block of mass ½ kg. if the block, with the bullet in it, moves with a velocity of 4 m/s the recoil velocity of the pistol will be?

Science
I need an idea for an essay about muscles

science help
Which of the following is a massive star that has reached the end of its stellar evolution? Neutron star Red giant Stellar nebula White dwarf is it c

science
a trait developed through learning is a ?

science
use the image below to think about how continental drift may have occurred. then answer the following question: according to the continental drift theory , which the following land regions should show the greatest similarities in fossil type A. east coast of south america and ...

Science
if one third of 100g of 27% aqueous sugar solution is taken in a beaker and 10g of sugar is added to it , the concentration of the resulting solution will be?

science
A boy complains of stomach pain to his mother. Unable to resolve the issue herself, she takes the boy to the doctor. Which of the following might be a good hypothesis for the stomach pain?The boy fell and hurt his stomach. The boy has an infection and needs antibiotics. The ...

science
calculate the heat f iodine vapours & solid are 0.031 & 0.055 cal/g respectively. If heat of sublimation f iodine is 24 cal/ g at 200°C .wat is its value at 260°C??

Science
Please someone help me figure this one out with three reasons. A group of researchers from a local lab are trying to get funding for a research study to determine if the color blue is better than the color green. They have written a proposal and submitted to the company that ...

Science
Thomas left the White House and traveled toward the capital at an average speed of 24 km/h. Jasmine left at the same time and traveled in the opposite direction with an average speed of 55 km/h. Find the number of hours Jasmine needs to travel before they are 59.4 km apart.

Science
A 6.90-g sample of solid NiSO4·6H2O was heated such that the water turned to steam and was driven off. Assuming ideal behavior, what volume would that steam occupy at 1.00 atm and 100.0 °C?

SCIENCE
1. Which of the following is an example of an environmental pressure? (1 point) the air pressure in the atmosphere a lake that is gradually running out of water a fight between two members of the same species breeding between two members of the same species 2. Which of the ...

science plz help
1. Compare the natural greenhouse effect with the human-induced process.

science help
One scientist discovered a new theory on the evolution of the universe. What is the next step for the scientist to take? A. transform the results of the theory into universal laws of nature. B. inform the scientific community so they can verify the results. C. call a press ...

science help
Two scientists did the same experiment but arrived at different results. The scientists most likely did not have accurate data and information misunderstand each other's interpretations belong to different backgrounds did not have instruments to take accurate measurements

math
Help me with this In a class of 30 students, 18 offer mathematics (M), 15 offer science (S) and 13 offer english (€). The number of students who offer all the three subjects is equal to the number of students who do not offer any of these subject. 10 students offer both ...

Science
Name two types of evidence used to support the theory of evolution. Explain how scientists use each type of evidence to provide support for evolution. Give one example of each.

Phyical Science
The town of Seaside needs to build a new power plant. The old coal burning plant produces too much pollution and is no longer safe. The mayor decides that he will do some research on alternative forms of energy like nuclear power plants and solar power plants. What types of ...

Phyiscal Science
A group of researchers from a local lab are trying to get funding for a research study to determine if the color blue is better than the color green. They have written a proposal and submitted to the company that could potentially give them the money needed to conduct the ...

science
a chunk of lead has a volume of 45cm^3 and a mass of 510g. What is the density of lead.

science
A boy shoves his stuffed toy zebra down a frictionless chute, starting at a height of 1.75 m above the bottom of the chute and with an initial speed of 1.07 m/s. The toy animal emerges horizontally from the bottom of the chute and continues sliding along a horizontal surface ...

SCIENCE PLZ I NEED HELP NOW
The joints highlighted in the image below are _______ joints. Fill in the blank

science
before 1937, all naturally occurring elements had been discovered except element 43. chemists predicted the chemical properties of this element, now called technetium. how were those predictions possible?

Science
Why is it easier to recover silver from a solution than to recover lithium from the same solution

science
how fast do sea horses swim. A.30 B.100 C.22 D.none of the above

science
What is the percent concentration of 0.4 M K2SO4 solution? Atomic mass: K-39g,S-32g, O-16g

science
A person drive an automobile with a mass of 450 kilograms at a velocity of 26 meters per second. The driver accelerates to a velocity of 30 meters per second. The difference in the automobile's kinetic energy is how many joules?

Science
1. Which organisms are capable of converting gaseous nitrogen in the air into a form that other living organisms can use? (1 point) A.)nitrogen-fixing bacteria B.)denitrifying bacteria C.)decomposers D.)producers 2. Which step in the nitrogen cycle is accelerated at the ...

Physical science
A train with a mass of 200,000 kg manages to brake to a speed of 3 m/sec before colliding with a truck with a mass of 2,000 kg that is stuck on the track. What speed does the truck move away from the train.

math
In a class of 30 students, 18 offer mathematics (M), 15 offer science (S) and 13 offer english (€). The number of students who offer all the three subjects is equal to the number of students who do not offer any of these subject. 10 students offer both mathematics and ...

science
how do i write a hypothesis for non truebreeding plants, i am in 7th grade

Science
what do you round to find the mass number of the most common isotope of the element?

science
what is it called when electrons in the outer shell are available to bond with other atoms?

Science
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 considered a part of Earth’s ...

Science
how the volume of air in a tank of compressed air would change if the volume of the tank doubled? My answer was: The volume of the air would increase and it would be more difficult to fit inside of the tank depending on if the tank was filled or not.

SCIENCE check answers please :)
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 considered a part of Earth’s ...

HELP SCIENCE
how the volume of air in a tank of compressed air would change if the volume of the tank doubled?

science
how the volume of air in a tank of compressed air would change if the volume of the tank doubled?

Science
Tellurium is a metalloid. How many valence electrons does tellurium have? 3 4 5 6

Science
Which of the following shows three elements in order of increasing conductivity? Ge, O, Mn O, Ge, Mn Mn, O, Ge Mn, Ge, O

Science
Inner transition metals are composed of which of the following? metals lanthanides and actinides halogens noble gases

Science
Which of the following is a characteristic of nonmetals? Nonmetals are often brittle solids. Nonmetals are often malleable. Nonmetals often conduct electricity. Nonmetals are often ductile.

Math
Samantha has homework in five subjects tonight. She has 15 minutes of science, 20 minutes of math, 30 minutes of reading, 20 minutes of writing, and 15 minutes of geography. If her mom walked in randomly while she was doing her homework, what subject would she most likely see ...

science
What is the molecular formula of Ethanoic acid?

Career
There are two types of bachelors' degrees, a Bachelor of Art or a Bachelor of Science. True False***

Science
How do the circulatory system and the endocrine system interact in helping to maintain homeostasis in humans? A. The endocrine system produces hormones that are transported by the circulatory system to target cells when changes are needed. B. The circulatory system provides a ...

Science
A 5.0 kg rock is dropped from the top of a building the speed of the rock after it has fallen for 4.2 seconds is _______meter per second

Science
An engineer messed design a runway to accommodate airplanes that must reach a speed of 71 m/s before they can take off the planes are capable of accelerating at a rate of 1.6 m/s person per second the minimum length of the runway must be _______

science
A 2.1kg soccer ball is struck with a 45N force for .3 seconds. What is the Frictional force if the ball rolls for 11 seconds before stopping.

Science-physics
A ball is thrown horizontally from the top of a building 37.5 m high. The ball strikes the ground at a point 80.3 m from the base of the building. The acceleration of gravity is 9.8 m/s 2 . Find the time the ball is in motion. Answer in units of s.

Science
Which of the following gases was most likely present in Earth's earliest atmosphere? A. nitrogen B. hydrogen* C. argon D. oxygen Which of the following statements accurately describes the development of the geologic time scale? A. Scientists developed the geologic time scale ...

Math
In science class, Savannah measures the temperature of a liquid to be 50^@ Celsius. Her teacher wants her to convert the temperature to degrees Fahrenheit. What is the temperature of Savannah's liquid to the nearest degree Fahrenheit?

Science CHECK ANSWERS PLZ
Which of the following gases was most likely present in Earth's earliest atmosphere? A. nitrogen B. hydrogen* C. argon D. oxygen Which of the following statements accurately describes the development of the geologic time scale? A. Scientists developed the geologic time scale ...

Science Please Help!!!
1) Which of the following is not a function of the human nervous system? A. regulating heartbeat B. listening to music C. moving oxygen from air into the blood D. signaling the diaphragm to contract 2) An external event stimulates a sensory nerve, which transmits a signal to ...

Science
I really need help with my science test please , let me know the answers to the following questions.:|) On Earths history unit test Lesson 9 for connections academy . Plz and thank you .

science
Calculate percentage concentration of a solution obtained after dissolving: - 12 g of KCl in 150 g of water

science
a fighter plane dives straight down with an acceleration of 3g . what is the magnitude and direction of pilot's effective (or apparent) weight if his real weight is w?

Science: Chemistry
How many kilojoules are released when 115 g of Si reacts with chlorine? Si(s)+2Cl2(g)→SiCl4(g)ΔH=W​22;657kJ

Science: Chemistry
Pentane (C5H12) burns in oxygen to produce carbon dioxide and water. C5H12(g)+8O2(g)→5CO2(g)+6H2O(g) Calculate the mass of CO2 that can be produced if the reaction of 38.5 g of pentane and sufficient oxygen has a 58.0 % yield.

College Algebra
The students in a political science class are divided up into three categories: liberal, conservative, or moderate. There are five more conservatives than moderates, and twice as many liberals as conservatives. How many of each type are there if there is a total of 87 students...

Science/Environmental Studies
What are some dependent variables for Global Warming?

science
How much water must be added to 200 g of a 10% NaOH solution to obtain 8% solution

COMPUTER SCIENCE
how to develop a C program that will determine whether a department-store customer has exceeded the credit limit on a charge account.

Allanridge Seconday School
I'm doing History , Life science, Geography and maths literacy......I want to do carreers that relate to helping people and assisting them, I'm more focused on doing therapy when I pass grade 12, So how many percentages is it garanteed that I can get a job after Matric

science
what is a biome? ecological niche?

science
a horizontal beam 6.8m long of mass 15kg is supported by pillars of 0.2 of each end. There is a man of mass 85 kg standing 1.7kg from one end of the beam .draw a diagram showing the forces acting on the beam in this equilibrium condition .calculate the magnitudes of the loads...

science
a concave mirror produces a real image 1 cm tall of an object 2.5 mm tall placed 5 cm from the mirror.find the position of the image and the focal length of the mirror.

Science
a 1.73 kg steel ball strikes a massive wall at 11.4 m/s at an angle of 50.9 with the perpendicular to the plane of the wall. It bounces off the wall at the same speed and angle it originally had.if the ball is ik contact with the wall for .101 s what is the magnitude of ...

Science
The search for identity usually occurs during???

science plz help fast
how do mutualism and parasitism compare ? 1.)at least one organism is helped in both cases 2.)at least one organism is armed in both cases 3.)organisms are only harmed in both cases 4.)organism are only helped in one while organism are only harmed in the other

Science
For the reaction shown below, the instantaneous rate of formation of Br(aq) is 0.12 M/s at t=2.0 min. 3Br0(aq) -> BrO3(aq) + 2Br(aq) What are the instantaneous rates of formation of BrO3(aq) and consumption of BrO(aq)?

Science
What laboratory instrument utilized the wave nature of electrons?

Science
6. A meander is best described as a A. depression for swimming. B. bend or curve in a stream channel. C. straight streamline into a lake. D. pond located streamside. B?

Science
Consider the following reaction: CaCO3 - CaO + CO2 Calcium carbonate (CaCO3) was heated to yield CaO and CO2. If 60.0g of CaCo3 was heated and the yield for CaO was 44.6%, calculate the mass of CaO created.

science
6) In ovaries, the final products of meiosis are A) haploid cells. B) diploid cells. C) triploid cells. D) polyploid cells. 7) Which example represents a DISADVANTAGE of asexual reproduction? A) Genetic variety slowly causes hundreds of species of beetles to form from a ...

science
Perfluorotributylamine (PFTBA) is found in extremely low concentrations (0.18 parts per trillion) but it has a great impact on climate. If Pftba concentrations increase, predict what will happen to the climate. Please help?

science
1) What is the purpose of DNA? A) manufactures proteins B) reduces activation energy C) stores hereditary information D) to aid in facilitated diffusion 2) What process accounts for species diversity? A) mitosis B) meiosis C) predation D) symbiosis 3) Which process results in...

science
Student were given a mkxture of marbles,salt sand,and pebbles. Most efficent way to separate this listing 5 step direcxion and the method and what you will be separating?

Physics/Science
During a baseball game, a batter hits a pop- up to a fielder 72 m away. The acceleration of gravity is 9.8 m/s^2. If the ball remains in the air for 5 s, how high does it rise?

Math
Karl's scores on the first five science tests are shown in the table. Test 1 Test 2 Test 3 Test 4 Test 5 85 84 90 95 88 Part A. Write am inequality that represents how to find the score he must receive on the sixth test to have an average score of more than 88. Part B. Solve ...

Science
If you were to walk toward a Van der Graaf generator, the effect of its electrical field would get weaker as you got to it. True or False? I say False.

Science
If you were creating a lamp by hand what type of material would you chose for the wiring and what material would you chose to coat the wiring? Why?

Science
What must happen to the electrons in a material to create an electric current?

Energy science
The deepest well from which water can be pumped, by creating a vacuum on the top end of the pipe, is 10 m (34 ft). In drilling for oil, wells of a mile or more in depth have to be made. From this depth, how do you think the oil is recovered? .

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