Science

Recent Questions

Science
Assuming a force of 50 N is applied to each object by each contestant, what is the acceleration of object A?_ B?_C?_ ( Person A's object is 5.0kg, person B's object is 2.5kg and C's is 0.5kg

Science
In a closed Circuit, the current flows only from the power source to an electrical device such as a lamp. True * False

Science
The approximate concentration of hydrochloric acid in the stomach(stomach acid) is 0.17m.calculate the mass of the following to neutralise 50cm of stomach acid.a)bicarbonate of soda b)aluminium hydro xide

Science
Vinegar contain ethanoic acid.titration of 3.00g of vinegar with 0.12mol NaOH solution requires 23.0cm to reach the equivalence point.what is the weight percentage of the ethanoic acid in vinegar

geography,maths literacy,life orientation,science
are they good and which job wil i be in or get?

Science
Current can be passed through salt solution but can not pass through sugar solution. Why? Answer in detail....

science
Financially,Canada would have benefited from keystone xl pipeline. What would have meant for individual Canadians? I know I have repeated the question from before but I need help urgently, since it's due tomorrow.

Algebra 1
A science teacher has supply of 50% methane solution and a supply of 80% methane solution.How much of each solution should the teacher mix together to get 105 mL of 60% methane solution for an experiment. a. 70 mL of the 50% solution and 35 mL of the 80% solution b. 35 mL of ...

Science:Biology
What are some unusual characteristics of food webs in agroecosystems?

Science
The law of conservation of _____ states that all particles must be equal before and after the reaction. word bank:elements, magnitude matter,mass,stress ,gradual chemical,physical ,weight.

science
Financially,Canada would have benefited from keystone xl pipeline. what would have meant for individual Canadians?

Algebra 1
What is the solution to the system? use elimination . -18.6x+ 17.2y=90.2 14.2x+ 3.4y= -35.8 a.(3,2) b.(-3,2) c.(2/3,4/9) d.(2,3) IS IT D?? Terry and ed start a lawn mowing business and purchase mowers and equipment for \$800. They charge \$20 for each lawn and \$4 worth of gas ...

Algebra 1
A restaurant has one type of lemonade that has 12% sugar and another that is 7% sugar. How many gallons of each does the restaurant need to make 20 gallons of a lemonade mixture that is 10% sugar? a. 12 gallons of the 12% lemonade and 8 gallons of the 7% lemonade. b.10 gallons...

Science
Why does the design of the vacuum flask minimize heat transfer by conduction? A)One flask is smaller than the other flask. B)One flask is more reflective than the other flask. C)There is no air between the two flask. D)The two flask do not touch each other, except at the neck...

Science
How much energy is needed to raise the temperature of 1500g of ice from -21.0 degrees Celsius to 113 degrees Celsius

Science "check my "answers"
1. Which of the following statements best defines tides? (1 point) when waves get bigger because of an approaching storm the rise and fall of ocean water that occurs about every 12.5 hours the rise of ocean water that occurs 12 times a day a giant wave that can be extremely ...

Science Question
Can some1 give me mayb 1 or 2 examples of a HETEROGENEOUS mixture for my lesson?? Thank you!

Science
Which law of chemical is illustrated by the fact that 168g of iron with 72g of water to form 232g of ferric oxide And 8g hydrogen

science
I am wondering why H2S has only London Dispersion forces and not Hydrogen Bonding?

Science
an airplane flies 800 km east and 600 in north. What is the total displacement (with approximate direction)? What is the total distance traveled?

Science
What is the density of a solid aluminum with a mass of 60g

Science
This has already been posted, however the provided answer does not make sense. Anyone have additional insight for this one? An excess of aluminum metal is added to 200.0 mL of 0.025 M solution of CuCl2, reducing the Cu+2 ions to metallic Cu. If the temperature of the solution ...

Math
The science test grades are posted. All students taking the test scored over 75. Unfortunately, 4 students were absent for the test and the computer listed their scores as 0 until the test is taken. Assuming that no score repeated more times than the 0's, what measure of ...

Science -- Check my Answer Plz (again)
A beaker contains 50.0 mL of water at 90.0°C. How many calories must be added to raise the temperature of the water to its boiling point (100°C)? A) 50.0 cal B) 1.00*10^3 C) 100.0 cal D) 5.00*10^2 I think the answer is B, but i also think im wrong...

Science -- Check my Answer Plz
How much heat (calories) must be applied to a 100 mL beaker filled with boiling water in order to vaporize the water? ** A) 540 cal ** B) 540 * 10^4 cal C) 800 cal D) 8000 cal Is A correct? or cud it be B.?

Science -- Explaination on Heat Capacity?
I need some1 to explain heat capacity to me because the way my lesson is teaching it is EXTREMELY confusing!! A simple explanation would be nice! Dumb it down 4 a 7th grader!!!!! If you could use the following question in the explanation, that would be great because this is y ...

PLZ Check my Science Project's summary?!
The following r the instructions to my Project: - Compose a scientific summary of your method, observations, data, and conclusions. In addition, be sure to answer the questions below in your report. 1. Why does the first method for determining volume work only for a regular-...

Science Project Help
Hello, My science project is asking me to "compose a scientific summary of your method, observations, data, and conclusions" on determining the volume of both regular & irregular objects. They wanted me to answer the 4 questions below in my summary: 1. Why does the first ...

Science
1.Which type of eclipse would you expect to see if the moon passes directly between Earth and the sun? -a solar eclipse -a lunar eclipse -a total lunar eclipse -a penumbra 2.Which of the following statements about a lunar eclipse is true? -A lunar eclipse can occur when the ...

Science
13.5g aluminium changes to Al^3+ in solution by loosing ..... electrons.

Science
1 mole of chlorine combines with a certain weight of a metal giving 111g of its chloride. The atomic weight of the metal (assuming its valency to be 2) is-

Science
How are temperature and thermal energy related A) Temperature and thermal energy both measure the total kinetic energy in an object. B) Temperature is one factor that determines the thermal energy of an object C) Thermal energy is one factor that determines the temperature of ...

social science
why is the amazon basin ecologically so important

Science
Resistance of tungsten wire is higher when it is hot and lower when it is cold this is because the temperature is

For your discussion assessment, you will present your proposal of a device that minimizes heat transfer So basically, an insulator. right? i uh... don't get what this questions asking... 0n0 help?

Science
The description of the structure of the atom is called the _____ thanks

Science
1.The images above show particles in a medium. Which of the following shows the worst conditions for a sound wave to travel? A B C D 2.Which of the following correctly describes a radio wave? A.long wavelength and high frequency B.long wavelength and low frequency C.short ...

Life science, history, accounting
I chose these subjects for grade 10, but I don't know what I'm going to do with them when I reach university or what career I could have with these subjects. Please help.

material science
What is the different between material science and material engineering?

Science
An airplane's speed in still air is 240 km/h. (a) If the pilot wishes the resultant motion of the plane to be due north when a 60 km/h wind is blowing the plane due east, in what direction should the plane be headed? (b) What will then be the resultant speed of the airplane ...

Science Fair
I just wanted to ask if this project written below is a High School Project... (Up,up,away in your own hot air ballon) This is the project name and also I don't need a link to this project, I have it already... Just tell me whether it is a high school project or not..

science
Which has more entropy neon or methane

Physics-science
A block of wood has a mass of 3.6kg and specific gravity of 0.6. It is to be loaded with lead of density of 11300 kg per cubic metre so that it floats in water with 0.90 of its volume immersed. What mass of lead is needed? (a) if the lead is on top of the wood? (b) if the lead...

Science
Why Is it important to include units with your temperature measurements

science
what is the boiling point of 3.77m sucrose

science
why tne unit of pd and emf is same

science
The work done by 500 calories of heat in isothermal expansion of ideal gas is?

Science
The difference between the speed of sound in air at 0 degrees Celsius and the speed of sound in air at 20 degrees Celsius is that A) cooler air molecules move more slowly and respond less readily to the energy of a sound wave B) cooler air molecules move more quickly and ...

Science
Which type of attractive forces do you expect between HCl3,HF,HCL?

science and technology
calculate the work done if a force of 80N is applied to a ball to move it to a distance of 24m.

Science - Chemistry
If vapour pressure of water is 17.5 torr at 20C, what is the water vapour pressure inside a bottle of 100 proof whiskey? 100 proof = 50% ethanol Total volume = 1 L Mass of ethanol = 394.5g Mass of water = 500g Density of ethanol = 0.789g/mL Moles of ethanol = 8.58 mol Moles of...

science,physics
Jesse Rose walks along a footpath for 6 minutes.She then cuts across a field, which takes a further 4 minutes.She walks a total distance of 900m. what is her average speed? could you please explain this step by step.

science,physics
i do not understand this question and by the way this is not my homework. Reggie sets out from home on his bicycle.First he goes to the shop, which is 500 m away, he then rides to his friend's house which is a further 1200m.He then returns home. what total distance has Reggie ...

Science
How are modern items made to look like ancient artifacts? (This is about radioactive decay and dating.)

Science
What types of artifacts can accelerator mass spectrometry be used to date, other than wood, paper, and bread?

Science
A train starts from rest with an accelaration of 0.5 m/s (square) find its speed in km/h when it has moved throug 100m

Math/Science
Calculate the minimum change in velocity (delta V or ∆V) required for the Space Shuttle to decrease its altitude to 60 miles if it’s orbiting with an apogee of 260 miles and a perigee of 220 miles above the surface of Earth.

Chemistry
An experiment calls for 100ml of 0.1M copper(II) sulfate solution. Write a step-by-step procedure for a science teacher to make 100ml of 5M stock solution and the required diluted solution.

Computer science
Score 1,Score 2 and Score 3 are the marks scored by a student in three tests. Write a pseudocode,an algorithm and draw the flowchart to find the average of best two scores.

science
what is computer?

science
Your bedroom gets direct sunlight through a window during the hottest times of the day. You ask your mom to turn down the thermostat in the house so your room can cool dow. Instead, your mom suggests that you put aluminum foil over the window. What will the results be if you ...

Science
Which of the following is an example of heat transfer by radiation? A. Wind currents B. a pot of water boiling on the stove C. a bare foot on a hot sidewalk D. a microwave oven heating food I think B? Not sure?

Science
Which of the following correctcly identifies the methods of heat transfer?

life orientiaton,history,geography,life science
What careers can I do with this subjects

science
an organisms particular role in its habitat or when and how it survives is called what?

science
A uniform solid sphere is placed on a smooth horizontal surface and a horizontal force F is applied on it at a distance h above the surface. The acceleration of the center?

ndzundza mabhoko secondary school
Hi I'm doing geograph, maths literacy, life science and business which career can I go for

Science
How can volcanic eruptions change the surface of the earth? by creating large deposits of coal by creating new islands and land by lowering land levels several feet by decreasing the level of the ocean I think its C

science
A body of mass m=2.6 kg is standing on a ramp inclined in an angle of α=14.9 degrees. The static friction coefficient between the ramp and the body is μ=0.29. The ramp, which is inclined to the left, is in a train, which accelerates to the right. What is the minimal ...

science
A body of mass m=2.6 kg is standing on a ramp inclined in an angle of α=14.9 degrees. The static friction coefficient between the ramp and the body is μ=0.29. The ramp, which is inclined to the left, is in a train, which accelerates to the right. What is the minimal ...

g the following subjects, life science,business st
Which courses can I consider at varsity

Science Fair Project
Is this Science Fair Project that I am doing a 9th or 11th grade project.... Up,Up, and Away in your own Hot-air ballon !Search up this Project and then tell me!

science help
Which of the following types of waves has the least amount of energy? Gamma rays Microwaves Radio waves Rays is it c

science help PLS
Which of the following describes the type of wave that transmits sound? Disturbance Longitudinal Propagated Transverse is it c

SCIENCE
How does temperature change during a chemical reaction. (Note: it has to be a Endothermic and exothermic reactions) Thanks

Science
a 60.0 N circus performer performs a high wire act 5.m above ground. About how much gravitational potential energy does the performer have? A.12.0j B.56.0j C.62.0j D.300.0j I think D but idk

Science
Two forces of resultant 100N are perpendicular to each other. If one of them makes angle 60 degree with the resultant. Calculate the magnitude of forces

science
A student mixed 1.5g of CaO with 2.5M HNO3. How many moles of CaO were reacted

science help
Which of the following is considered a drawback to using wind energy as a source of power? Wind energy is highly polluting. Wind energy is nonrenewable. Winds do not always blow consistently. Winds produce lesser quality energy than other sources. is it c

science help
During which step in the Can Crush Lab did the air pressure outside the can become greater than the pressure inside the can? The can was filled nearly to the top with water. The can was placed on the hot stove burner for several minutes. The can was removed from the hot oven ...

science help
What is the relationship between atmospheric pressure and the density of gas particles in an area of decreasing pressure? As air pressure in an area decreases, the density of the gas particles in that area decreases. As air pressure in an area decreases, the density of the gas...

Science Ms.Sue
Which phase in mitosis or meiosis are these 1.Chromosomes pair up and can exchange genetic material 2.The nuclear membrane in the daughter cells breaks down 3.The chromosomes line up along the center of the cell and two spindle fibers, one from each end of the cell, attach to ...

SCIENCE PHYSICS
WHEN a body hanging from a spring balance is immersed in water it floats just below the surface of water and shows 100 g loss in its weight then what is the weight of the body in water,in air,what is upthrust on the body what is the volume of tne body.

dzwaboni sec school and am doing this subject(math literacy, history, geography,life science, life orientation, English and tshivenda
Am in grade 10 and I do maths literacy.so what percentage should I get in maths literacy to do law degree?

science help PLS
What is the relationship between atmospheric pressure and the density of gas particles in an area of decreasing pressure? As air pressure in an area decreases, the density of the gas particles in that area decreases. As air pressure in an area decreases, the density of the gas...

Science
What would happen to ocean tides on Earth if Earth stopped rotating?

Social Studies
which statement best describes the thinking of the enlightenment? A. the power of reason is more important B. scientific ideas must fit religious beliefs C. only god knows how the world works D. faith is more important than science is it A?

Science chemistry
a steel cylinder of oxygen with a volume of 15 L was available for medical purposes. The cylinder pressure decrease from 40.6 to 38.5 atm during which time the temperature remain at 24.0 °C how many moles of oxygen had been removed

Science
a steel cylinder of oxygen with a volume of 15 L was available for medical purposes. The cylinder pressure decrease from 40.6 to 38.5 atm during which time the temperature remain at 24.0 °C how many moles of oxygen had been removed

science
calculate the possibility that mother being a carrier of hemophilia with B blood group and healthy father with AB blood group can have an affected son with A blood group. give proper genotypes and crosses

science
what are three of the populations in an ecosystem near you

science help
Which of the following is something you should do after severe weather occurs? clean up flood waters keep away from windows create a family safety plan invite friends over to see the damages is it c

1 Science Question Unanswered
Okay... I got all the answers. Thanks for the helps anyways. :( I just at least need one help. 1. In plants, sexual reproduction occurs when sperm and egg unite to form a... a. gamete b. gametophyte c. sporophyte d. zygote Is it a or d?

Science
1. In plants, sexual reproduction occurs when sperm and egg unite to form a... a. gamete b. gametophyte c. sporophyte d. zygote Is it d? 2. A plant continues to grow throughout its life through the use of s a process called... a. alternation of generations b. photosynthesis c...

Science
1. In plants, sexual reproduction occurs when sperm and egg unite to form a... a. gamete b. gametophyte c. sporophyte d. zygote Is it d? 2. A plant continues to grow throughout its life through the use of s a process called... a. alternation of generations b. photosynthesis c...

Science
I really need help! Can someone tell me if my answer is correct? Question; Explain the difference between carbon-14 reading for the human skull and brown rock. Why is there such a difference? What does this tell you about dating extremely old objects? My answer; The carbon ...

physical science
Carla applied a force of 35 n to a wheelbarrow full of bricks and moved it 2.5 m.which of the following can be determined from this information ?

science
to lift a load to the roof you apply 21 n of force to a pulley . the puley applies 21 n of force to the load what is the mechanicalo advantage of the pulley ?

science
A ball is dropped from a height of 10 meter.If the energy of the ball reduces by 40% after striking the ground, how much high can the ball bounce back?

Comm Tech
1.)Marla remembers her tuesday class schedule by using the acronym Mest . Which of the following might be her class schedule? A.)Math,Social Studies, English,Technology B.)Math,English, Social Studies,Science, Technology C.)Math,English,Social Studies,Technology D.)Math,Social...