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science
a car is used to move a crest of mass of 645kg on a horizontal road the horizontal force exerted is 15000n the coefficient of kinetic friction is 0.8 calculate the acceleration of the car

Science
1. What is the main difference between mechanical and electromagnetic waves? A. Mechanical waves involve transfer of energy, electromagnetic waves do not. B. Mechanical waves require a medium to travel in, electromagnetic waves do not.~~~~ C. Mechanical waves have amplitude ...

Science
1. What is the main difference between mechanical and electromagnetic waves? A. Mechanical waves involve transfer of energy, electromagnetic waves do not. B. Mechanical waves require a medium to travel in, electromagnetic waves do not.~~~~ C. Mechanical waves have amplitude ...

Science
1. What is the main difference between mechanical and electromagnetic waves? A. Mechanical waves involve transfer of energy, electromagnetic waves do not. B. Mechanical waves require a medium to travel in, electromagnetic waves do not.~~~~ C. Mechanical waves have amplitude ...

Science
Hybridisation of C in [ CH triplebond C sinlebond CH doublebond CH2 ]

science
Two objects slide over a frictionless horizontal surface. The object A with a mass of 5000g is moves at a speed of 4.5m/s toward the object B (mB= 2500g) which is initially at rest. After the collision, both objects are directed to 30O on either side of the original line of ...

science
Write the structural formula of 2,3,5-trimethyl-4-propylheptane.

science
1 litre of coffee at 80oC need to be cooled to 40oC. Assuming that all the ice melts and no heat is lost to the environment. Take the specific heat capacity of coffee to be 4200J/kgK, density of coffee to be 1000kg/m3 and latent heat of fusion of water to be 3.34 x 105 J/kg. ...

basic science
1 litre of coffee at 80oC need to be cooled to 40oC. Assuming that all the ice melts and no heat is lost to the environment. Take the specific heat capacity of coffee to be 4200J/kgK, density of coffee to be 1000kg/m3 and latent heat of fusion of water to be 3.34 x 105 J/kg. ...

Science
The following sphere is responsible for forming the solid shell of Earth that holds up life? -Hydrosphere -Lithosphere -Atmosphere -Biosphere** Explain the interaction between the four main components of Earth's physical systems. Be sure to include the name of each system and ...

Science
where is the crater of the asteroid that killed the dinosaurs

Science
What is the main difference between mechanical and electromagnetic waves? A. Mechanical weaves involved transfers energy; electromagnetic waves do not B. Mechanical waves require a medium to travel in; electromagnetic waves do not***** C. mechanical waves have amplitude and ...

science
An elephant of mass 500kg stand with all four feet on the ground.Each foot has an area of 0.08m2.Calculate the pressure exerted on the ground.(g=10/s2)

Science
What is the difference between short-circuiting and overloading? From what I can gather from my textbook, both happen as a result of external resistance being lesser than the sum of internal resistance.

Science - Plate Tectonics
Where does the source of heat for Earth’s convection currents come from

Science-tectonic plates
What occurrence is caused when transform plates get stuck?

science
why does the load reaches 50 meters from the ground will the correct position of the PE and KE that the problem isa crane lifted a 1000 kg load to a height of 50 meters from the ground. at which position are the PE and KE of the load equal

Science
Find molecular mass of an element having- Density= 1.56 gm/l Temp.= 65 degree Celsius Press.= 745mm

Science
Which tunable property is the great thrust in biological and medical sciences? A) physical B) chemical C) biological D) none

Science
What is the increment in power if current increases by 1% and resistance remain constant

Math,science,social,Hindi,english
A person weighing 50kg runs up a hill raising himself vertically 10m in 20sec. Calculate the power of the person.

Science
Granite lasts a long time when it is used for building in areas where

Materials Science
The atomic radii of Mg2+ and F-1 ions are 0.072 and 0.133 nm, respectively. (a) Calculate the force of attraction between these two ions at their equilibrium interionic separation (i.e., when the ions just touch one another). (b) What is the force of repulsion at this same ...

Science
How many grams of NaOH will be needed to prepare 250ml of 0.1M solution:-

Science
When a silvery powdery substance was added to boiling beans,the beans get cooked quicker than normal. what may this be?

science
were must be the pivot situated on a straight lever 2m long,if a downward effort of 200N at one end is to lift a mass of 50kg at the other end.state the distance from the effort.

Physical Science
If Argon is 39.948, calculate average at kc mass of argon

Mrs Sue Plz help (Science)
How is an mold and a cast related

science
A 13,500 kg jet is moved with a thrust of 5,224,700 Newtons west. what is the acceleration of the jet?

science
How does a sequoia tree sustain itself and support bad weather if its roots are short?

Science
How are a mold and a cast related Someone plz help

natural science/bio
flow diagram of circulatory and respiratory system combined

Science (check my answers)
14. Chemical runoff from fields, oil spills, and erosion is the major source of a. air pollution b. water pollution*** c. hydropower d. renewable energy 15. Which compound causes the depletion of earth's ozone layer? a. ultraviolet radiation*** b. chlorofluorocarbon c. carbon ...

Science (check my answers)
11. How do fossil fuels contribute to air pollution? A. By releasing carbon dioxide into the air*** B. By recycling oxygen C. By reversing the greenhouse affect D. By releasing nitrogen into the air

Science
1. Which of the following is the most effective way to preserve biodiversity? A. Captive Breeding B. habitat destruction C. habitat preservation*** D. habitat fragmentation 2.which of the following would result in the greatest reduction of waste A)composting food waste B)...

Science
Plzz Help me i need help Why is California's high speed rail such a groundbreaking effort??

Science
Which statement correctly describes the sun and earth? a. the sun and earth both have water. b. the sun and earth both have a surface called the crust. c. the sun and earth both have an atmosphere d. the sun and earth both have breathable air

science
A ray of light travelling in air strikes the water surface at an Angle of 30 degree calculate the Angle of light refraction if refractive index of glass is 1.5

chemistry
name an invention or event (related to science or technology) from the past 100 years that you think has helped shape the roles of women today.

science
Formic acid ,HCOOH, is a monoprotic acid. circle the acidic hydrogen. Write the formula of the conjugate base after the acidic hydrogen is lost.

Science
Calculate and give answer of appropriate number of significant digits A. 7.6 x21.9 B. 2,15 x 3.1 x 100 C. 38/7

Science, 10th class
Is the resistance of a resistor change when it cuts into 3pieces

Science
1- Freezing of water is ____ change. 2- A solid which dissolve in water is called ____

Science
In a heat engine, if 700 J of heat enters the system, and the piston does 400 J of work, what is the final internal (thermal) energy of the system if the initial energy is 1,200?

Physical Science
A 10 N object rests on a 10° incline. What is the normal force? What is the parallel force? A 10 kg object rests on a 10° incline. What are the normal and the parallel forces?

science
A ray of light travelling in air strikes the water surface at an angle of 30 degree calculate the angle of refraction if refractive index of glass is 1.5

Science
How much more concentrated is 1ml of 0.5mg/ml haemoglobin in 10% sucrose at an absorbance of 2.4, compared to a solution of 0.1ml of 0.5mg/ml haemoglobin in 10% sucrose and 0.9ml of 10% sucrose at an absorbance of 0.350

Science
Why is it better to use a micropipette that can transfer 200 microlitres or less, to transfer 200 microlitres, over using a pipette that can transfer 200 microlitres or more?

science
How many moles of carbon monoxide are needed to react completely with 108 kg of Fe2O3. Fe2O3(s)+CO(g)→Fe(s)+CO2(g)

Science
The seeds develop into BLANK and are dipersed

Science
Can Someone explain this? Should other states wait to see if the high-speed rail system works well before starting their own plans for similar systems?

Science
Match the question with the correct conversion factor needed. Column A 1.What is the mass, in grams, of a single atom of carbon?: 2.What is the mass, in grams, of a single atom of iron?: 3.What is the mass, in grams, of a single molecule of water?: 4.What is the mass, in grams...

Science
What mass of sodium has the same number of atoms as 50.0 g of calcium?

Science
Discuss your opinion of the consequences of artificial selection and the advantages and disadvantages of using genetic information in society. Use facts from your research to support your opinion. Cite the sources for your facts. Also, discuss your answer to the Apply the Big ...

science
10. How does a star's life begin

Science
1.Acceleration involves a change in? A.time B.direction C.speed D.both direction and speed I think it's D?

Science Plz help
How were the Aborigine people affected when their children were forced to live with British families or in institutions?

Science: Chemistry
What is the mass percent of oxygen in sodium bicarbonate(NaHCO3)?

Science
1. groups/ family of elements are ones which: A. Have the same number of electrons in the valence/ outer engery level B. Have exactly 8 electrons in the valence shell outer energy level C. Have the same number of protons in the nucleus 2. A period represents elements which? A...

Science
What are 4 producers, 4 consumers, and 2 decomposers you would find in a Pennsylvania ecosystem

Science
PLEASE CHECK MY ANSWERS :) answers marked below 1. Which of Earth’s spheres contains most of its mass? (1 point) atmosphere *** hydrosphere geosphere biosphere 2. Erosion and weathering are examples of which types of forces? (1 point) constructive forces destructive forces...

Science
Jordan is doing a science fair project on the effects of music and growth of tomatoes.he has two tomato plants, plant A and plant B that he grows in a window and gives the same amount of water. Plant A is exposed to classical music using headphones atttached to the soil. ...

science
How do we identify or interpret when to get the screen away or towards the mirror in different situations? Please tell me diff. cases---phy practicals

Science
How are cheetos made?

Science
How do you fix an ink machine

Science
What unit would be the most appropriate to use when measuring(in S1 units)the length of a pencil

science
The half life of radium is 1590 yrs. how long will it take to 1 gm of element to loose 0.1gm

Science
18. The description of the structure of the atom is called the ___. ATOMIC MODEL 19. In a water molecule, two atoms of hydrogen and one atom of oxygen share electrons. A ______ bond is found in a water molecule. COVALENT BOND 20. Sodium chloride is formed when the metal ...

Science
1. The current atomic model would be revised if better microscopes were being used to study its structure. better microscopes are invented in the future. new information about an atom’s structure is discovered. ********** a new element is discovered in the future. 2. Melinda...

Essentials og Psychology
The science of the mind questions please for Penn foster. No need of answers. Please help.

Science
1. granite lasts a long time when it is used for building in areas where

Science
1. In paper chromatography, is the substance being tested the solute or solvent? Explain your answer.  I think the substance being tested is a solvent. I think this because it is being dissolved to form the ink on the filter paper.  2. A bucket of paint spills on your ...

Science
A uniform have metre rule,pivoted at 20cm mark balances horizontally when a mass of 50g is suspended from 4cm mark calculate the mass of the metre rule.

science
1. In paper chromatography, is the substance being tested the solute or solvent? Explain your answer. I think the substance being tested is a solvent. I think this because it is being dissolved to form the ink on the filter paper. 2. A bucket of paint spills on your classroom ...

Science
which of the following planets are considard rocky venus neptune saturn uranus i think uranus

Science
When the temperature equals the dew point, what is the relative humidity? A.zero B.10% C.50% D.100%

SCience
After watching the Farmers and their Lost Dreams: The Dust Bowl Years video segment, reflect back on the stories of two American farming families as they struggled to survive the dust storms that overtook the plains Write a paragraph in reaction to what the survivor shares as ...

Science- Astronomy
How are Earth and Venus different? I already wrote that they have different atmospheres but I need another reason why are different so can someone help me please?

science
Astronauts who are working outside the space shuttle require an audio speaker in their helmets because ________. PLEASE HELP!!!!!!

science plz check
Describe the outer planets. The outer planets, unlike the inner planets, are much larger and made up of gases. They have many moons, and larger rings of ice that go around the entire planet.

science
describe the inner planets.

science
Why can't we see a new moon?

Science
The combined resistance of two identical resistors connected in series is 8 ohm. Their combined resistance in a parallel arrangement will be?

Science
A man drop a stone of mass 2kg room the top of a building of height 15m when it reaches the ground find its kinetic energy.

Science
If a small marble and large marble are hit with the same force which will go farther? Why?

Science 6
When you turn on a battery powered flashlight, you transform... A:heat energy into light and chemical energy. B:chemical energy into electrical energy and light. C:heat energy into chemical energy and light. D:eletrical energy and light energy into chemical energy. I think B ...

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

Science
When calculating delta Tsample,why is th initial temperature taken to be 100 degrees Celsius

Science
Why is the weight of an object less on the moon than on Earth?

science
The effects of electricity can be explained by the structure of the _______?

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....

Science
What percentage of the energy from the grass would the hawks get in the trophic level pyramid of a food chain

Science
how much work is done on a 50kg cart that is pushed 10m at a constant rate of 5m/s^2

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....

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....

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....

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....

Science
How much power is lifted if a person lifts 60N weight up 2 meters in 10 seconds?

science
why dos buying food that is grown in your local area help prevent loss of biodiversity ??????

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________

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