Science

Recent Questions

Science
If you find a mysterious organism, how can you figure out whether or not it is a plant?

science
Rocky (terrestrial) refers to the

science help pls pls
Which of the following is a myth about water conservation? An important part of water conservation is preventing water pollution. Buying bottled water conserves more water than drinking from the tap. Air-drying clothes conserves more water than using an electric clothes dryer...

science help pls pls
Which of the following best explains how water conservation can reduce waterborne diseases in a community? More people will have clean water to drink and bathe in. More people will drink bottled water imported from faraway springs. More people will be encouraged to visit the ...

science
im doing a powerpoint on valleys and i need some facts if there some websites you can send me too that wood be graet

science
What is the density of a copper sample that has a mass 90.0g and volume of 10g

Science
Compare renewable and nonrenewable energy sources, and discuss the effects of each on biodiversity.

body science
I have to do this for an open ended question on my unit test and i am not sure if i did it right can you please check my answers? It is fill in the blank. And the choices are: Arteries,Artium,Body,Carbon Dioxide,Lungs,Veins,Ventricle. You may youse these words more than once. ...

Science
what volume of air containing 20% O2 will be required to burn completely 10cm3 each of methane and acetylene?

science
A pistol that fires a signal flare gives the flare an initial speed of 180m/s. Air resistance is ignored. (a)If the flare is fired at an angle of 55° above the horizontal, what is the horizontal range? (b)If the flare is fired at the same angle over the flat of sea ...

Science
.a sodium atom has the following distribution of electrons in its energy cells: shell1: 2 electrons shell2: 8 electrons shell3: 1 electron I think its shell 2

science
density of gold is 19.32 g/cm^3.A piece of gold leaf is 2.50 cm on each side and 0.100 mm thick,How many atoms of gold are in this piece of gold leaf?

Science
If you find a mysterious organism, how can you figure out whether or not it is a plant?

Science
Is all light energy Solar energy?

science
why does nicotine make it difficult for a smoker to quit using cigarettes it helps with weight loss for for many people it makes people sleep long hours many people experience intense headaches the cost of nicotine is very affordable for teens

Science
Why do scientists study images made with parts of the electromagnetic spectrum other than visible light? A)These images are the only way to observe galaxies beyond our own. B)These images reveal information that visible light does not show. C)These images show important data ...

Science
Refracting telescopes use lenses. Reflecting telescopes use mirrors. However, both types of telescopes have something in common. How are both types of telescopes similar? A)They both magnify tiny nearby objects. B)They both reflect light that enters the telescope. C)They both ...

Science
Karen is studying types of spacecraft. Which of these spacecraft can people use to travel to and from orbits close to Earth? A)space probe B)space shuttle C)space station D)space telescope I think the answer is C.

Science
What is the best explanation for why scientific theories are modified? A)Theories more than ten years old are usually out of date. B)Scientists want to prove that the work of other scientists is wrong. C)New evidence that supports a revision prompts scientists to modify the ...

Science
PLEASE HELP 1. Katie is bowling. She starts with the ball in her right hand and her arm as far back as it will go. She swings the ball forward, applying a force of 78 Newtons the whole time. When her hand has traveled through a path of 0.9 meters, she releases the ball, and it...

Science
A boat moves at a speed of 15 km/h in still water. The river it is traveling in flows at a rate of 3 km/h downstream. What is the velocity of the boat if it travels downstream? What is the velocity of the boat if it travels upstream?

Science
The compound KCIO3 decomposes according to the following equation 2KCIO3- 2KCI + 3O2

science
The reaction H 2 CO 3 + H 2 O ↔ H 3 O + + HCO 3 – takes place in water. What happens to the equilibrium when the pressure is increased ? A-It favors formation of reactants. B-It favors formation of products. C-It does not change. *** D- It is conserved.

Engineering science
2. A wooden block slides directly down an inclined plane, at a constant velocity of 6 m/s. a. How large is the coefficient of kinetic friction if the plane makes an angle of 25 degrees with the horizontal? b. If the angle of incline is changed to 10º, how long far will the ...

Science
which of the following statements best describes the energy of a waterfall? A) The water has Kinetic energy because of its position at the top of the water fall B)potential Energy changes to Kinetic Energy as the waterfalls. C)kinetic energy changes to potential energy as the ...

science help PLS
Which of the following is a sign of poor quality water? Zero turbidity A pH of 7.0 High phosphate content High dissolved oxygen

science help pls pls
Which of the following is typically associated with a large amount of organic material in a water supply? Lower turbidity Higher phosphates Fecal coliform High dissolved oxygen is it c pls help

science
Magnesium can react with aqueous nitric acid, HNO3, to form hydrogen gas and magnesium nitrate. Write down the balanced chemical equation for this reaction, remembering to use the state symbols.

Physical science 7th grade
What is the internal structure of the cavefish and the minnow suggest common ancestry?

science
the mean weight of 500 males students at a certain college is 151 lb and standard deviation is 15lb .assuming the weights are normally distributed, find how many students weigh between 120 and 155 lb ..ii) more than 185 lb

computer science
how to write c++ program to compute to display natural number between 1 and 30 which are divisible by 12

Computer science
Is computer a system?

Science
A transformer with 1890 turns in its primary coil has to decrease the voltage from 4620 V to 220 V for home use. How many turns should there be on the secondary coil?

science
How do everyday activities like driving a car and using electricity led to global warming?

maths lit, life science,History,English,Afrikaans,
I want to become an astronomer so I was wondering if it's possible to study for one or wht help me plz ???

SCIENCE
HOW MANY TERMS OF GP 1,2,4,8..... GIVE A SUM GREATER THAN 500.

science
calculate the velocity of a car increases from 54km 1hr to 72 km/hr if the mass of the car is 1500kg find the work done to increase the velocity

Science
What is the relationship between number of loops on an electromagnet and the strength of the magnet? Can you help e or break this down for me please? @Ms.Sue thank you

Science
Provide three statements that demonstrate the importance of units when describing motion. (3 points) Can anyone help me with this? I don't understand what they want

Science
The ratio of numbers of moles of butane to the number of moles of oxygen necessary for a complete of butane is

science
If you had 100 mL of juice, how many milliliters would be fruit juice?

science
4.which of these statements best describes the relationship difference between minerals and rocks. 1.most minerals are made of rocks. 2.most rocks are made of minerals. 3.rocks are solid but minerals are not. 4.rocks are found on earths surface but minerals are not.

Maths, life science,business studies, EGD, LO and
Which career to choose with these subjects done in matric

Science
Meta and para isomers are more soluble in water than ortho isomer?

Science
If a car traveled a total of 300 km in 4 hours what is the average speed

Science
The water in a puddle has a mass of 1500 grams. The sun comes out and the puddle evaporates. How many grams of water vapor enter the air from the puddle?

Science
Use the terms atom and element to explain what makes silver and gold different

Physical Science
A 20.0-Ù resistor and a 45.0-Ù resistor in parallel are connected to a 120-V dc source. (a) What is (are) the current(s) through the resistors? current through the 20.0-Ù resistor: Incorrect: Your answer is incorrect. . A current through the 45.0-Ù resistor: Incorrect: ...

Science
If an atom has a mass number of 23 which of the following is always true

Science
Christina has a glass of water. Michael has a fruit juice drink. Both drinks are at room temperature, and both students add ice to their drink's. Condensation begins to on the outside of Christina's glass before Michael's. How can they state their observations as a problem to...

Science
Christina has a glass of water. Michael has a fruit juice drink. Both drinks are at room temperature, and both students add ice to their drink's. Condensation begins to on the outside of Christina's glass before Michael's. How can they state their observations as a problem to ...

Science
Christina has a glass of water. Michael has a fruit juice drink. Both drinks are at room temperature, and both students add ice to their drink's. Condensation begins to on the outside of Christina's glass before Michael's. How can they state their observations as a problem to ...

Science
What is the mass of a box pushed both left and right at 50N?

science help pls pls
Which of the following is typically associated with a reduction in photosynthesizing plants in a water supply? An increase in dissolved oxygen A decrease in dissolved oxygen An increase in phosphates A decrease in phosphates is it b

Science
You go rock climbing with a pack that weighs 50N and you reach a height of 30m. How much work did you do to lift your pack? A. 80 joules B. 1500 joules C. 20 joules D. 1.67 joules

Science
A car runs at a constant velocity of 15m/s for 300sec and then accelerates uniformly to a velocity of 25m/s over a period of 20s. This velocity is mantained for 300s before the car is brought to rest with uniform deceleratiom in 30s. Draw a velocity time graph to represent the...

science
A large drop of about 5 mm (3/16 in.) diameter reaches a maximum speed of about 9 m/sec."

luthayi high school. science
How can methanol be harmful to human if accidentically swallowed

Biology (High school science)
If non-nucleated cells of meristematic tissue are used for tissue culture, then growth rate will be : a) High b) Average c) Very low d) Growth may not take place. Please help!

science computer
The program will accept the final marks of a group of students in a class. The lecturer can choose '1' to finds the highest and lowest marks in the class. The lecturer choose '2' to find the average marks of that class. If user enter other number, message "wrong choice" will ...

Science
How to work out the weight on mercury Jupiter and Saturn

Science
When the right atrium contracts, the right ventricle always contracts simultaneously. left atrium always contracts simultaneously. left atrium always relaxes simultaneously. left atrium and left ventricle always relax simultaneously. Help

science
Can you unscramble these two words? ACGIJJ 2nd word is KMNPKSU

science
space craft is heading towards the sun which is located 150,000,000 km. away from earth at a speed of 17,000 km, per hour. what is the approximately to the nearest year how long will it take to arrive at the sun's surface? show work

Science
The solubility of potassium nitrate is 40 at 30 degree celcius. Calculate the mass of water required to make a saturated solution by dissolving 15 gram of potassium nitrate at that temperature. Could u guys help me to get answer of this question. Plz help me otherwise my marks...

Geography,maths lit,life science,physical science,xhosa,life orientation and english
Will i be able to do law with the following subject maths lit,geography,life science,physical science and english

Science
15. Which of the following factors is the most likely explanation for an energy deficit that results in exercise-induced exhaustion. A.Insufficient protein production B.Insufficient mitochondrial function. C.Impair urea elimination. D.Absence of oxygen transporters on the ...

Science
What is the main function of the lymphatic circulation is to A. transport hormones around the body B. provide immune function for protection C. provide a backup for systematic circulation D. transport nutrients and oxygen to cells I think B

Social studies
9.advances in science from the scientific revolution were applied to human affairs during the A.industrial revolution B.french revolution C.enlightment (MY ANSWER) D.age of exploration 10.which event led most directly to a decline in the political power of ancient greek city-...

Science
Referring only to the periodic table give the ionic charge expected of these representatives elements type your answers format 1+ 2 - Te Be Ba P Li Ga C At

science
Which of the following is not an example of potential energy? Chemical energy gravitational energy mechanical energy*** nuclear energy

Science
WHAT ARE ALL THE ELEMENTS TO THE PERIODIC TABLE!!! Thanks for the help!

Science
A rectangular piece of wood measuring 20cm by 5cm by 3cm weighs 900kg.Find the greatest pressure the piece of wood can exert if placed on a table.

science
a body with a mass of 40kg is at the point of sliding down an incline plane of 20degrees.calculate the external force required to pull the body up the incline plane

Science
Which type of energy in the bungee chord prevents the bungee jumper from hitting the ground after a jump? A. kinetic energy B. elastic potential energy *** C. magnetic potential energy D. thermal energy -- Side note: Please help. I am not asking for the answer, I'm simply ...

political science
The book has a chart listing the public approval of several things/people/events and compares it to the approval rating of Congress. Who/what has a LOWER approval rating than Congress? The IRS Paris Hilton All of these choices have a HIGHER approval rating than Congress U.S. ...

political science
What "celebrity" was a Congressional witness who testified with the help of Representative Duncan Hunter before the House Education Appropriations subcommittee in support of funding for school music programs? Question 8 options: Elmo Big Bird George Clooney Kermit the Frog

political science
Where might a member of Congress hold the floor indefinitely and thereby delay a vote on a bill which he or she objects (aka fillibuster)? The House The Senate Both the House and Senate Parliament

science help pls pls
Which of the following types of stars is cooler than an orange main sequence? In Graph A, the curve peaks at 800 nm, in the red section of the visible light spectrum. In Graph B, the curve peaks at 550 nm, in the green section of the visible light spectrum. In Graph C, the ...

science help pls pls
Which of the following is typically associated with a reduction in photosynthesizing plants in a water supply? An increase in dissolved oxygen A decrease in dissolved oxygen An increase in phosphates A decrease in phosphates pls help me

Physical science
ONE SECOND after ball A is projected upwards with a velocity of 16 m/s, a second ball, B, is thrown vertically downwards at a velocity of 9 m/s from a balcony 30 m above the ground. 1.Calculate how high above the ground ball A will be at the instant the two balls pass each other?

science
If a projectile is shot under an angle of 30* with a force of 500N what is the time the projectile reaches the maximum hight.The projectile's mass is 100g.(g=10N/kg)

Science
determine the pH of each of the following solutions: 0.0812M HCl pH 3.11*10^-4 M HI pH 8.65*10^-8 M KOH pH 0.00212M Ca(OH)2 pH

science help PLS
A home gets its water from a private well. Which of the following would be the best way for the homeowner to obtain a water-quality report? A.Hire a local contractor to test the home's water supply B.Record observations made by smelling and tasting the tap water C.Request data...

Science
determine the pH of each of the following solutions: 0.0812M HCl pH 3.11*10^-4 M HI pH 8.65*10^-8 M KOH pH 0.00212M Ca(OH)2 pH

Science
Which of the following are the sites within the human body where carbon dioxide and oxygen are exchanged? A. Alveoli B. Arteries C. Synapses D. Venules I think A

Science
An example of active immunity is the transfer of A. antibodies through the placenta. B. immunoglobulins through breastfeeding. C. antigens through vaccination. D. immune cells through a blood transfusion. I think c 46. Which of the following classes of biological molecules ...

Science
Which of the following structures is present in both prokaryotic and eukaryotic cells? A. Golgi apparatus B. Cell membrane C. Endoplasmic reticulum D. Chloroplast I think B

Science
Which of the following is the pH when the concentrations of hydrogen ions and hydroxide ions in an aqueous solution are equal? A. 14 B. 7 C. 1 D. 0 I think 1

Science
Which of the following tissues would send a message to the brain indicating that someone has touched something hot? A. Epithelial tissue B. Nervous tissue C. Muscle tissue D. Connective tissue I think a

Science
An individual suffers severe blunt trauma to the thoracic cavity. Which of the following organs are at greatest risk from this injury? A. Heart and lungs B. Liver and stomach C. Brain and spinal cord D. Large and small intestines I think A

Science
Which of the following statements best explains the relationship between the mitochondria and the plasma membrane? A. The mitochondria makes proteins that become a part of the plasma membrane. B. The mitochondria makes a gas that the plasma membrane uses. C. The mitochondria ...

Science
In a certain plant, red flower color(R) is dominant over white(R). if a plant heterozygous for red flower color and one with white flower are crossed, which of the following would be the expected proportion of individual in the next generation? A. 4/4 red 0/4 white B. 3/4 red ...

science
you are given one litre each of 0.5 M HCL and 0.2 M HCL. How should they be mixed so as to give maximum volume of 0.4 M HCL.

science
Two positive point charges of 12 * 10 ^-6 and 8 * 10 ^-6 respectively are placed 10 cm apart in air .the work done to bring them 4cm closer

Science
Radius of an iron sphere is0.21m if density of iron is 7.80g calculate the mass

science
The length of a football field is 100 yards. When you compare geologic time (4.6 billion years) to the length of a football field, you will find that each yard on the field will equal 46 million years, and each 10-yard section will equal 460 million years. Use this information...

science
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 period not considered a part of Earth's geological history?

Physical Science
What is the density of a rectangular block that has a mass of 500g and a volume of 50cm3? what i came up with was 1000. i feel like im wrong though. can anyone please help me.

Science
Alisha use wire to connect a battery,a lightbulb,and a switch,but the bulb does not light up even thought the switch is in the closed positio.which might explain the problem?

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