Science

Recent Questions

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...

Science
istance of a planet from sun is four times the distance of the planet frpm earth.How many years will the planet take to complete one revolution of sun?

science
Suppose the height of the net is 0.800 m , and the court's border is 11.2 m from the bottom of the net. Use g =10 m/s2 and find the maximum speed of the horizontally moving ball clearing the net..

science
pH of HCl solution is 2. Calculate the pH if this solution was diluted twice

Science
How to calcualte the enthalpy change for the process in which 6.00g of steam at 100C is coverted to liquid water at a temperature of 35.0?

Science
Which is a good experiment that shows light changes when it enters a new medium?

science help PLS
An astronomer sees two stars in the sky. Both stars are equally far from Earth, but the first star is brighter than the second star. Which of the following is a valid conclusion about the first star? It is larger than the second star. It is smaller than the second star. It is ...

science help PLS
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

science
vs =6 volts vth =2 volts ida(diode current)=1m amp no value given for resistor network find rth(thevenien) 2,000 and 4000 do not work. diode current must not be equal to isc.?? voc=2 volts

science
which describes a use of a renewable source? Mining copper Burning coal Car filled with gasoline Building a wooden furniture

physical science
A car travels at a constant speed around a circular track whose radius is 3.5 km.The car goes once around the track in 400 s.What is the magnitude of the centripetal acceleration of the car?

science
Resistivity dependent on length and area or not

science
Rheostat varies what 1. Current 2. Resistance 3 . voltage

Science
What's the difference between ambient temperature and body temperature?

science help PLS
Which of the following correctly describes a way in which Earth’s atmosphere interacts with the geosphere? It contains gases that living organisms breathe. It contains gases that trap incoming solar radiation. It provides a medium for cycles that provide nutrients to living ...

Science
Describe circular motion. Which of Newton's laws helped you describe circular motion Plz I need help fast, thx!!

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

physical science
If a runner's power is 400 W as she runs, how much chemical energy does she convert into other forms in 10 minutes? (You will need to rearrange the Power Equation.)

Language Arts
Hi guys, can someone help me with three questions? 1. Which word best completes the sentence? I am going to ___ my chemistry teacher to learn more about careers in science. a. investigate b. discover c. interview d. evaluate Is it d or c? Or neither? 2. Which of the following ...

science
14.If a forest ecosystem is removed through clear-cutting, many species of organisms that lived in that ecosystem disappear. Their loss is due to ________________________. 15.When fossil fuels are burned, they produce ________________, the main greenhouse gas responsible for ...

science
Calculate the PH of the 0.4g of NaoH in water to give 200ml of solution

Science
What can scientists learn from the rate at which radioactive elements decay? A. a rock's absolute age* B. the relative age of rock layers C. where one soil horizon ends and the next begins D. the difference between molds and casts. The relative age of a rock is A, its age ...

Language Arts
Hi guys, can someone help me with three questions? 1. Which word best completes the sentence? I am going to ___ my chemistry teacher to learn more about careers in science. a. investigate b. discover c. interview d. evaluate 2. Which of the following sentences contains an ...

Science
Is photosynthesis a endothermic reaction

Science
Earths forces

science
in addition to body structure and development, which of the following is used to classify animals? Speed, color, DNA or location

Phyical Science
What technology is involved in gathering or using natural gas? How do we use natural gas to generate electricity?

Science
I need help with one question: 1.) Which of the following is a behavior that is cyclic? (Definition of cyclic: occurring in cycles; regularly repeated) Running from predators Searching for water Hunting at Night Migrating for Warmth (Hunting at night is only something that ...

Phyical Science
how do we use natural gas to generate electricity?

Phyical Science
Which is more expensive to create wind power or natural gas?

Science
You do 100 J of work in pulling out a nail with a claw hammer. If the hammer does 70 J of work, what is the hammer's efficiency?

Science
What are some renewable energy sources? Also what is a renewable energy source that produces cool air?

Science HELP PLZ
1. Which type of eclipse would you expect to see if the moon passes directly between Earth and the sun? (1 point) a solar eclipse* a lunar eclipse a total lunar eclipse a penumbra 2. Which of the following statements about a lunar eclipse is true? (1 point) A lunar eclipse can...

Science
heartworm is a type of worm that enters a dogs body through a mosquito bite. it produces offspring that lodge in a dogs arteries and food off of surrounding cells. which type of relationship is this a. mutualism b. predation*** c. commensalism d. parasitism

Science
Which of the following is most likely an example of a predator adaptation. a. warning coloration b.keen eyesight c.thick body armor d.spines

Geography History Life science English Xhosa Lifeo
If I'm doing History can I be able to study nursing

Science
If a piece of paraffin wax has a mass of 900g and density of 9g/cm3, if the wax was melted to the liquid state approximately what would its volume be?? HELP PLEASE!!!

science
Tow masses are moving down a slope. One mass is traveling twice as fast as the other mass. How does the kinetic energy of one mass compare to the other?

science
If the temperature of 0.20 kg of gold, which has a specific heat of 130 J/kg • °C, increases by 25°C, how much energy has been transferred to the gold by heat?

science
find the distance covered when speed is 960 km/hr and time is 1hr 50min.

science
For which value of angle is the range of a projectile fired from ground level a maximum?

Adv. Func./Science Question
Hi, I have this question that I will be tested on but my teacher didn't teach us how to do it so I am confused on how to even start. Please explain on how to start the question...thank you How bright a star appears can depend on how much light the star actually emits and how ...

science
which of the following is the function of live

science + check over
please check my answers + help me improve them. * 1.) explain why earth & other planets were not solid when they formed during the beginning of the precambrian, approximately 4,600 million years ago + what was this particular time period called & why is this time period not ...

science
A cattleman has installed a new electric fence. The cows keep escaping because they are not deterred by the low power they experience when touching the fence. There are two dials on his controls. Would you tell him to change the amperage or voltage? Support your answer with ...

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?

math, physical science,geography and CAT
Which career can I earn

science
how is trna made and how dose it help us make proteins

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