Science

Recent Questions

Science
Why the earth rotate each 24 hours?

Science
A man walks 5m towards east and turns right and moves 12m. The magnitude of displacement is

science
carbon moboxide reacts with hudrogen to produce methanol chemical equation: balanced equation:

Physics
Home Economics Math Music Physical Education Science Social Studies GRADE LEVELS Preschool Kindergarten Elementary School 1st Grade 2nd Grade 3rd Grade 4th Grade 5th Grade 6th Grade 7th Grade 8th Grade High School 9th Grade 10th Grade 11th Grade 12th Grade College Adult ...

Science
A car of mass 1200kg increases its velocity from 20m/s to 60m/s in 8seconds. Calculate the acceleration force on the car.

science
a helium nuclide of mass M1 moving with a velocity Vo is incident on a stationary nuclide of mass M2. After collision M1 was deflected through an angle x and M2 an angle y. If the velocities of the nuclides after collision were V1 and V2 respectively show that for an elastic ...

maths littercy ,agricultural science ,life science ,tourism , life orientatiom, ndebele and english
i completed my matric last year , now i don't know which carrer should i do or follow and in which college or university

science
A charge of 10 coulombs has been travelling through the wire of a simple circuit,with a current of 3 A. How long has the current been flowing?

science
how does the electric field in space change when the air in the space is replaced be dielectric oil?

science
How is the virtual image produced by a converging lens different from the virtual image from a diverging lens?

Science
Write a paragraph or make a PowerPoint to explain how genetic variation and environmental pressures can lead to change in an organism. Write a second paragraph that describes an example of a plant or animal that has changed due to these factors. Include graphics or pictures.

science help pls
Which of the following is a technique used in relative dating? Beta decay Index fossil correlation Isotope ratios Radiocarbon dating is it d pls help me

science help PLS
Examine the following diagram. Place the labeled layers in order from youngest to oldest. Diagram showing a section of rock strata. The bottommost layer is labeled 'A'; the layer directly on top of layer A is labeled 'B'; the layer directly on top of layer B is labeled 'D'; a ...

ph science
a flight attendant pulls a wheeled suitcase, applying a 64-N force at a 35 degree angle to horizontal. how much work does she do in pulling the suitcase 45m f=d/t=64+35=99/2x45=2227.5

science
A wagon 8kg travelling due east with a velocity of 10m/s collides with a second wagon of mass 12kg travelling due west at 2m/s. After collision the wagon moves off at 3m/s due east. Determine the magnitude and direction of the velocity of the 12kg wagon after collision.

science
assuming that sea water is an aqueous solution of NaCl its density is 1.025g/mL at 20C temperature and NaCl concentration is 3.5%(by mass), the normality of the sea water?

help ms. sue/ science
how is a parallel circuit different from a series circuit? Need help!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!​!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!​!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!​!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!​!!!!!!!!!!!!!!!

science help pls pls
A scientific law can be best described as an explanation of a specific relationship a series of observations with contradictory data a phenomenon which works under changing conditions a description of specific relationships under given conditions is it a pls help me

science help pls pls
Derek designed an experiment to demonstrate interactions between Earth systems. He cleared a patch of land in his backyard and poured a glass of water from a height of 12 inches above the ground. A depression was formed on the land at the spot where the water hit the ground. ...

i really need help with science pls help
A scientific theory is proposed after several valid investigations. This makes scientific theories elaborate descriptions of observations the most powerful explanation scientists have to offer unchangeable by other scientists over a period of time unacceptable to a majority of...

i really need help with science pls help
The Hawaiian Islands are examples of islands that formed over a hotspot. Based on this information, which of the following processes formed the Hawaiian Islands? Melted rock called magma rose through holes in Earth's crust and gradually solidified as it cooled. Tectonic ...

science help
Which of the following sets of characteristics describe what we know about the dwarf planets? Orbits the sun, has sufficient mass to assume a nearly round shape, and lacks the gravity to clear items near its orbit. Has sufficient mass to maintain a round shape, orbits the sun...

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A new object, Object Y, was discovered outside our solar system. Object Y is small and rocky, is not a satellite of any other object, and it does not have enough gravity to clear away smaller objects near its orbit. The characteristics of Object Y most closely resemble those ...

science help pls pls
Which of the following terms refers to the foamy bubbles of a breaking wave? Duration Fetch Speed Surf is it d pls help me

science pls help
Which of the following causes the formation of surf on a breaking wave? Beach erosion Low wind speeds Deposition of sand on a beach Friction with the ocean bottom at the coast is it d pls help me

Science
11.)Create a scale for your model thermometer. Divide the distance between the two marks into 5-mm intervals. Starting with the lowest point, label the intervals on the straw 0, 1, 2, 3, and so on. Describe your scale below.

Math
40 students are in the science club. 45% are girls. New girls enter the club and now the percentage of girls is 56%. How many new girls join the club?

Science "HELP"!
Passage:The particles of matter are in constant motion. The energy of motion is called kinetic energy, so the particles of matter have kinetic energy. As matter becomes warmer, its particles move faster. As a result, their kinetic energy increases. Temperature is related to ...

I REALLY NEED HELP WITH THIS SCIENCE
The three things you can sort them into are: Executive branch, Legislative branch, and Judicial branch. Things you can sort are: crafts bills, directs military, interprets laws, declares wars, decides court cases, can impeach president, vetoes bills, decides if laws are ...

science
a rock is thrown 1.8 meters into the air. find how fast it was thrown?

Writing/ Science
I need help formulating topics for an essay. Topic: Why is it important to learn about local energy programs. How will one benefit from it. Thank you

i need help with science pls
PLEASE HELP ME! Uranium can supply energy for the world's electricity without emitting harmful greenhouse gases. Which of these statements best describes an outcome of uranium mining? a. The people living near the mines may suffer from diseases due to radiation b. The rivers ...

i really need help with science pls help
One student made the incomplete diagram shown below to represent the relationship between magma, igneous rocks, and metamorphic rocks. Individual labels for Magma, Igneous rocks, and Metamorphic rocks set up in a triangular shaped diagram. Which of these is the correct next ...

i really need help with science pls help
Two groups of scientists got different results while studying about the origin of the universe. Which of these statements is most likely true about the results of the two groups of scientists? They were not repeated and verified. They provide new testable ideas to strengthen ...

science help pls pls
Which statement best explains why the Big Bang Theory is the leading scientific explanation of the development of the universe over time? Its experiments reject all old theories on the origin of the universe. Its experiments yield different results every time they are repeated...

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Infrared radiations are produced when a changing electric field creates a longitudinal wave parallel to it longitudinal wave perpendicular to it changing magnetic field parallel to it changing magnetic field perpendicular to it is it d pls help me

Science
Do all organisms get the same amount of energy? Why or why not? I would think that organisms get different amounts of energy since some need more and others need less. Like a plant would need different amounts of energy from a bear. A plant would get more energy, it is a ...

science
calculate weight by volume for 0.8molal urea,density of solution is 1.14gram per ml

Science
Identify and describe the features found in the ocean basin floor

science-college physics
Searches Related to 1. A mass of 20 kg is suspended at the end of a rubber cord of diameter 2.0 mm and length 100 cm. Find the period of vertical oscillations of the mass. [Take young’s modulus E, for the rubber = 2.0 x 108 Nm - 2

science
A torch bulb is marked with 2.4 volts and 0.75 A calculate the power dissipated

Maths Lit, Geography, English, LO, EGD, Afr.
I am very good at Geo and EGD. Because I didn't take Physical Science, I cannot get into varsity for any engineering degree courses. Can you make alternative career choices available that might include these two subjects?

science
solubility product of Ca(OH)2at 25'C is 4.42*10^-5. A 500ml of saturatee solution of it is mixed with an equal volume of 0.4M NaOH .How muchb Ca(OH)2 PREcipited

Science
A car is travelling at 25m/s. The driver takes his foot off the accelerator and slows down. His decceleration is two metres per second squared. How long does it take him to reach speed of fifteen metres per second squared?

science/biology
introduction to cane toad

science
What is the effect of temperature on viscosity of liquid s and why

science
which of the following is a posioned gas? option- (a)carbondioxide (b)nitrogen(c)none of these (d) carbon monoxide

science
Combining 0.280 mol of Fe2O3 with excess carbon produced 19.4 g of Fe.

Science at National University OF Samoa
2-bromobutane heat with 2M NaOH. What is the observation and the chemical reaction for the reaction?

science
10 students whose combined mass is 700 kg ride down 30 m in a elevator. How much thermal energy is produced in the elevator system by the loss in gravitational potential energy of the students

Science
If the Earth was tilted so that the Arctic and the Antarctic were in the equator's location, how would it affect the climate?

Science
For the reaction: 2NO(g) + H2(g) <=> N2O(g) + H2O(g) + energy Write the equilibrium constant expression for the reaction. This reaction takes place at 25°C. At this temperature the concentration of NO is found to be 1.75 mol/L, the concentration of H2 is 3.00 mol/L, the...

science help pls pls
A star is observed from two positions of Earth in its orbit, in summer and winter. Which of these is the best method to calculate the approximate distance of the star from Earth? measure the parallax and use it in calculations measure the red shift of emitted light and use it ...

Science
The opening to the tracheal system (respiratory system) in insects is the spiracle. trachea. alveolus. bronchus. stomata.

science (correct please)
(1) Which of the following is an ectothermic vertebrate A) butterfly B) lizard C) eagle D) dog ~~~~~~~~~~~~~~~~~~~~~~~~~ My answer: B ~~~~~~~~~~~~~~~~~~~~~~~~~ (2) which of the following animals is an invertebrate? A) goldfish B) horse C) turtle D) grasshopper...

science
Which of the following is something you should do after severe weather occurs? - clean up flood waters *** - stay away from windows - create a family safety plan - invite friends to see the damage

Science
1. In the real world there are many insulators that you encounter every day. Give an example of a material that is an insulator and another material that is a conductor that you may use on a regular basis. Why do you think these materials were chosen for their particular ...

science
What ia the Iupac name of [Cr(CN3)]CL3

Science
as a liquid is heated and changed into a gas what happens to molecules

Science
Is jumping through a hoop an inherited trait for a dolphin?

science
Explain what would happen if your epiglottis stopped working properly. A. you would have to go to dialysis to get your blood filtered everyday B. you would have to use an inhaler when the pollen or dust repeatedly bothered you C. you would choke on food when it went down the ...

science
how many moles if gold are present in 49 gram of gold

Science
A constant volume of O2 gas is heated from 140C to 216C. The final pressure is 22.3 atm. What was the initial pressure?

Science
Which of the following is true about chemical energy? A. Chemical energy can be stored more efficiently as glucose than it can be as ATP B. Chemical energy is stored when bonds in ATP are broken to form ADP C. Chemical energy is released when bonds in ADP are broken to form ...

i need help with science pls
]Most of the drinking water in a location comes from a river. A steel plant is to be built close to the river. It would provide jobs and facilities to many people in the location. The steel plant would use a huge amount of river water. This might cause drinking water scarcity ...

science help pls pls
A pond is located beside an open mine. Mercury from the mine contaminates the river water. This is an example of single pollution multiple pollution point source pollution non-point source pollution would this one be c or b. im having trouble with this one.

science help PLS
A nuclear power plant produces huge amount of electricity. However, it dumps radioactive wastes into the sea. This has led to an increase in illness among people living along the coast. Which of these is the best method to solve this problem? Increase public awareness to close...

science help pls pls
Which of these surface features are formed when the acid in groundwater reacts with limestone? rivers and springs sinkholes and caves hot springs and geysers wetlands and volcanoes is it b pls help me

science check
The lake water in a location in Florida has been found to contain high levels of fecal coliform. What are people in the location most likely to do? breed fish in the lake stop swimming in the lake reduce their water consumption install water filtering equipments in their ...

science help pls pls
Which of these statements best explains why scientists use models? to allow other scientists evaluate their data to speed up or slow down natural processes to describe and explain non-observable objects and processes to predict the scientific theories which would be proposed ...

science help pls pls
Dams are used to produce hydroelectric power. Which of these best describes the impact of a dam on the environment? It causes air pollution. It reduces the level of groundwater. It causes changes in the river ecosystem. It reduces the level of oxygen in river water. is it c ...

Science Please Help ASAP
1. Over which interval is the velocity greatest? FILL IN THE BLANK ____ 2. Over which interval(s) is the velocity zero? FILL IN THE BLANK ____ 4. What is the average velocity in m/s from A to B? FILL IN THE BLANK ____ 5. The velocity of an object goes from 4 m/s to 12 m/s in ...

science
Which of the following substances has the greater heat capacity? a. 0.02 g of aluminum b. 2.00 g of aluminum c. 20.0 g of aluminum d. 200 g of aluminum*** please correct me if im wrong

science
Which of the following is true? Choose all that apply. a. When molecular kinetic energy transferred to a substance, the motion of the molecules in the substance increases. b. When molecular kinetic energy is transferred away from a substance, the temperature of the substance ...

Science 8th
How is a parallel circuit different from a series circuit? A: A parallel circuit only has one path for the circuit to take. B: A parallel circuit has more than one path for the circuit to take. C: A parallel circuit has a broken path for the circuit to take D: A parallel ...

Science
How does subduction change the ocean floor? a) subduction cause magma to accumulate on the ocean floor b) subduction causes oceanic crust to break into pieces •• c) subduction causes the ocean floor to sink into deep-ocean trenches d) subduction causes metamorphic rocks to...

Science
What kind of magma produces a quiet volcanic eruption? A. Magma that is rich in Silica B. Magma that is Fluid C. Magma that is low in Iron D. Magma that is low in Silica•• Correct me

Science
locate the epicenter of an earthquake a seismologists must determine all of the following except ? a) the difference between arrival time of P and S waves b) seismographic locations data from the seismograph locations c) the distance from the epicenter to at least three ...

Science
of the following illustrates conduction as a mode of heat transfer 1 point a microwave oven produces electromagnetic waves that transfer to the food in the form of head leaving a metal spoon in a bowl of hot soup will make the spoon at a well •• pasta rises and falls with ...

Science
mount twin peaks located in northern Vancouver Island erupted three million years ago and it has not erupted since then. Mouth twin Peaks is most liekly ? a) dormant •• b) active c) extinct d) stationary Correct me

science
Which of the following substances has the greater heat capacity? a. 0.02 g of aluminum b. 2.00 g of aluminum c. 20.0 g of aluminum d. 200 g of aluminum*** please correct me if im wrong

science
Which of the following is true? Choose all that apply. a. When molecular kinetic energy transferred to a substance, the motion of the molecules in the substance increases. b. When molecular kinetic energy is transferred away from a substance, the temperature of the substance ...

HEALTH PLZ HELP MEEEEEEEEEEEE ASAPPPPPPPP
Explain what would happen if your epiglottis stopped working properly. A. you would have to go to dialysis to get your blood filtered everyday B. you would have to use an inhaler when the pollen or dust repeatedly bothered you C. you would choke on food when it went down the ...

math mrs sue please help or any one
I'm in connections and this is a quiz the value of the dependent variable in a function is always blank the value o the independent variable a greater than b dependent on c equal to d less than a science class planted a tree in the school court yard that was 6 inches tall. its...

Health Plz help THX!!
Explain what would happen if your epiglottis stopped working properly. A. you would have to go to dialysis to get your blood filtered everyday B. you would have to use an inhaler when the pollen or dust repeatedly bothered you C. you would choke on food when it went down the ...

Science
The speed of a bycyle reduce from 20 m/s to 4 m/s after travelling 80m .calculate

science
Which of the following best describes the relationship between economic growth and energy use?

science
Charcoal from an ancient campfire has a ratio of 14C to 12C that is one- fourth that of new wood. About how old is the charcoal? The half- life of 14C is 5730 years.

science
what will be the speed of a 5oo kilogram mass satellite if we apply 100N force on it after each second till 10 hours and the current velocity of this satellite is 16,800 miles per hour?

Science
Acetylene gas combust.how many grams of carbon dioxide and grams of water are produced when 52.0 g of acetylene burns ?

science
if a force of 3000 N can move a crate at an acceleration of 4.0 M/S what is the mass of the crate

science help pls pls
The information about groundwater recorded by a student is valid when it is not biased its results cannot be repeated it is not obtained from a primary source its findings do not have to be shared with others is it a pls help me

science help pls pls
Which of these is the most practical method to prevent global water shortage? Stop planting trees and shrubs in gardens. Conserve, recycle and reuse water in households. Stop using appliances like washing machines and dishwashers. Discourage setting up of power plants which ...

science pls pls pls help me
The lake water in a location in Florida had an unusual color and smell. Investigations revealed that the lake? water contained high levels of toxic fertilizers and pesticides which were carried into the lake from gardens and common areas in the location. What are people in the...

science
Here are all the word you can use chemical property mixture heatcapasity homogeneous viscosity sublimitation physicalproperty compound chemicalformula substance density mass tempurature pressure heterogenerous A _________ property of matter describes its ability to change into...

science PLEASE CHECK MY ANSWERS
1. why is it rare for the soft parts of an organism to become a fossil a. the soft parts take a long time to decay. b. the soft parts can be eaten by other animas. c. The soft parts cannot be buried in sediment.>>>my answer d. the soft parts from petrified fossils. 2....

7th Grade Science
Hi, I really need help with this. I'm asked to write a paragraph about this. I just need some help working it out so I can get everything correct. I'm not cheating its just confusing this part of the assignment for me. So please help! I also have to study for Math State Test ...

Science Help
Can someone briefly describe thermal energy?

Science
What Gases Are Produced When A Chicken Is Being Flied Or Cooked? That Aroma Which We All Identify From A Distance And Say I Smell Chicken

Science
A 1 420kg car coasts in neutral down a 2.0 degrees hill. The car attains a terminal velocity of 24.3 meters per second. How much power must the engine deliver to drive the car on a level road at 24.3 meters per second?

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