# Science

## Recent Questions

Physics/Science
A steel bar reaches a temperature of 420 degrees celsius after it has been welded. Over the next 50 minutes the steel bar cools to 30 degrees celsius. What is the rate of temperature change of the iron?

Physics/Science
After a gas furnace comes on, it takes 45 minutes for a room's temperature to warm 17 degrees Celsius to 22 degrees Celsius. What is the rate of temperature change of the air in the room?

science
will silver nitrate solution mixed with calcium sulfate solution produce white precipitation? Will it be because formation of silver sulfate?

science
a scientist is trying to determine the identity of an element. it highly reactive in water and forms an ionic bond with chlorine. its very shinny. the element is likely? A) from Group 17 B) from group 1 C) from group 15 D) a noble gas

science
the retarding acceleration of 7.35m/s^2 due to frictional force stops the car of mass 400 kg travelling in a road. the coefficient of friction between the tyre of the car and the road is force=ma =7.35*400 =2940N µsN=2970

science
Does a trucks momentum decrease, increase, or stay the same when a truck driver begins to brake?

science
I have researched for an hr. Can someone help me find what energy transformation takes place when a firecraxker explodes? The choices given to me are : a. Gravitational potential to mechanical and electromagnetic. B:NUCLEAR to kinetic and,chemical. C: mechanical to ...

science
how many atom molecules are there in a water molecule?

science
Hey, my question is: The rope of a swing is 3.30 m long. Calculate the angle from the vertical at which a 94.0 kg man must begin to swing in order to have the same KE at the bottom as a 1550 kg car moving at 1.57 m/s (3.51 mph) Thanks !

Phyical science
A fire engine is rapidly approaching the corner. Explain what happens to the frequency of the sound wave as the fire engine draws closer. What do you hear? Can some please help

science
Which law of chemical combination is illustrated by the fact that 168g fe reacts to from 232g Fe3 O4 and 8gH2 Plz give me the answer as am struck last to submit my assignment plz plzhelp me

science
Which law of chemical combination is illustrated by the fact that 168g fe reacts with 72g H2O to from 232g Fe3 O4 and 8g H2.

Maths Lit, Agic Science, Geography & Life Science
Hi, Im in grade 10 in Ngodini High School at Mpumalanga. I'm doing Life Science, Agricultural Science, Geography & Maths Lit - I want 2 know that which career path I can do?

Science
1. Under which of the following conditions would a fossil most likely form? A. A living thing dies and sediment is very slowly deposited on top of its body. B. A living thing dies and sediment quickly covers its body. C. A living thing dies and its skeleton is left exposed to ...

Science
Which of the following is an example of a chemical property of matter? -ability to melt* -Ability to freeze -Ability to react -Ability to break

Science
Which of the following is an example of matter? -Leaves -Shadows -Light from the sun* -Sound

Science
1. Under which of the following conditions would a fossil most likely form? A. A living thing dies and sediment is very slowly deposited on top of its body. B. A living thing dies and sediment quickly covers its body. C. A living thing dies and its skeleton is left exposed to ...

1. Under which of the following conditions would a fossil most likely form? A. A living thing dies and sediment is very slowly deposited on top of its body. B. A living thing dies and sediment quickly covers its body. C. A living thing dies and its skeleton is left exposed to ...

Science
Hannah is comparing a rock from a riverbed and a rock from deep underground. One is very smooth, and the other has very rough edges. Explain why each rock was probably found in that location. Answer: The rock that is very smooth is likely to be the one near the riverbed ...

Science
How do I measure Delta H^degree for the reaction that occurs when reagents A and B are combined: A + B <-->? Please note that each prepared flask contains 100mL. Also, you can assume the heat capacity of the aqueous solutions is equal to the heat capacity of water 4.18 J...

SCIENCE
1. Under which of the following conditions would a fossil most likely form? A. A living thing dies and sediment is very slowly deposited on top of its body. B. A living thing dies and sediment quickly covers its body. C. A living thing dies and its skeleton is left exposed to ...

Earth Science
Which of the following is not a process that forms metallic ore? placer deposits *** fossil compaction hydrothermal solutions igneous processes 5. Which of the following nonmetallic mineral resources is used both as a building material and as an industrial mineral? sulfur ...

Earth Science
Which of the following is not a process that forms metallic ore? placer deposits *** fossil compaction hydrothermal solutions igneous processes 5. Which of the following nonmetallic mineral resources is used both as a building material and as an industrial mineral? sulfur ...

Physical science
Using a hammer to drive a nail, it is the reaction force that brings the motion of the hammer to a stop but the ___________ that drives the nail into the wood.

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

Math
Tickets to science exposition cost \$5.75 each for students and \$7.00 for adults. How many students and adults went if the ticket charge was \$42.75?

Science
An airplane is traveling 725 m/s at 48.8° degrees north of west when a wind starts to blow. The velocity of the wind is 106.7 m/s and it is blowing 21.8° east of north. What is the speed of the airplane relative to the ground?

science
A beam 6 m long is simply supported at the ends,and carries a uniform distributed load of 1500kg/m (including its own weight ) and three concentrated loads of 1000,2000 and 3000 kg acting respectively at the left quarter point,centre point and right quarter point. Draw the ...

Science
A block of metal is on a table. what must be true for thermal energy to flow from the table to the metal? a. both the table and the metal must be cooler than the surrounding air. b. the metal must be cooler than the table c. the table and the metal must be in thermal ...

Science
A boat moving at 8.9 km/hr relative to the water is crossing a river 4.6 km wide in which the current is flowing at 2.4 km/hr. At what angle upstream should the boat head to reach a point on the other shore directly opposite the starting point?

Science.
Describe how the Triassic period was a transitional time period during the Mesozoic era. Explain why the boundary between the Triassic and Jurassic periods is similar to the boundary between the Permian and Triassic periods.

Science
Were dinosaurs multicellular or unicellular?

science
Ice cubes of total mass 6.00 grams have temperature -4.0°C. Then they are placed in 50.0 grams of water at 20.0°C in an insulated foam cup. What is the equilibrium temperature of the water inside the cup?

science

phomolong secondary school
i am a grade 11 learne,i cant choose the that is good for me from the following subject history,geography,life science,sepedi,life orientation,english,math literacy.

science
in what stage of meiosis is there single chromosomes

science
in what stage of meiosis is there single chromosomes

science help
One group of students is investigating the properties of charged objects. Their observations are listed below. When two positively charged objects are brought close to each other, they push each other away. When two negatively charged objects are brought close to each other, ...

science
in general, how can you distinguish whether a trait you are studying is inheritable or is the result of environmental effects?

science
If a single gen controls the mutant trait, how will you determine the dominant and the recessive expression of the gene?

John has a barometer for measuring atmospheric pressure as he climbs Mt. Everest . the higher he get the higher the pressure reading . is this a result he should except ? A : Yes atmospheric pressure and height are related B : No , there is no pressure from air on Mt. Everest ...

Science
A car is traveling at 65 km/hr. The brakes are applied and the car stops in 3 seconds. How far does it travel? Write down the given, unknown, formula, solution, and the final answer.

science
If a 5 kg disc is rotated at 5000 rpm how much torque will be produced ??

Computer Science
i Need help, using loops, visual studio 2013. write a program using loops that will calculate the following, how much would \$24 deposited in a bank in 1626, have been worth at the end of this year if it had received an interest rate of 6% compounded annually compounded ...

Science
Someone help I'm having trouble answer this question. Explain what maria and craters are and how they formed.

Science
A car is traveling at 65 km/hr. The brakes are applied and the car stops in 3 seconds. What is the car's acceleration?

science
The human stomach is an organ that helps us digest food. The stomach is one of many organs involved in the process of digestion. Others include the esophagus, small intestine, pancreas, and gall bladder. What name is given to a set of organs that work together to perform a ...

science
the waves above is an electrical signal resulting from a sound wave. how does the information in this electrical signal make it to your car radio, it is carried on an FM wave by modulating its frequency,is it carried on an FM wave by its amplitude, is it carried on an FM wave...

Science 8
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.)Electrical energy and light energy into chemical energy. Is it ...

science
besides coal and oil (fossil fuels) what type of rocks store a great deal of carbon?

Math
Ernesto drew a map of his school. He used a scale of 1 inch: 50 feet. What distance in inches on Ernesto's map should represent the 625 feet between the cafeteria and the science lab?

science
other than astronomy would astronomers have to study in order to discover black holes?

computer science
In a particular phase modulation system, each symbol is able to represent 6 bits. What sort of PSK is being used plain PSK QPSK 8PSK 16PSK 64PSK 256PSK

Physcial Science
Interpreting Graphs: a. At 0oC, what is the state or states of the water in the beaker? b. At 80 s, what is the state or states of the water in the beaker? c. What did you observe about the temperature of the water inside the beaker when ice is still present? Explain. What ...

science
A 0.972g sample of a CaCl2*2H2O/K2C2O4*H2O solid salt mixture is dissolved in ~ 150ml of deionized water, previously adjusted to a pH that is basic. The precipitate, after having been filtered and air-dried, has a mass of 0.375 g. The limiting reactant in the salt mixture was ...

Science...anyone?
1. Which of these sources of energy is NOT renewable? a.) wind b.) solar power c.) hydroelectric power d.) natural gas 2. Air can be polluted by _____. a.) tiny particles of soot b.) carbon monoxide c.) sulfuric acid d.) all of the above 3. Which of the following can cause ...

Science
Suppose the moon rotated on its axis just as quickly as earth. Would you still see the same side of the moon from earth? Please help!

History
7.)With the formation of the colonies came the combining of many different cultural groups. How is the influence of African slaves and Native Americans on colonial culture similar? A.)They only made small, unimportant contributions. B.)They both influenced the food, art, and ...

Science
2 spherical containers- P and Q are connected by a tap. P contains a gas at pressure 5 atm at 300K. Q contains same gas at pressure 2 atm at 400K. If tap is opened find the final pressure. Given: volume of Q is 4 times volume of P.

Science plz help
Describe how community residents and authorities can prepare for an earthquake and its aftermath. Review earthquake advice from the USGS, the American Red Cross, and other agencies. If you live in an area that is susceptible to earthquakes, include suggestions specific to your...

Science
How much force must be applied to accelaerate a 40 kg chair at 2.8m/s2?

Science 7
Which of the following describes the genotype and phenotype of parents whose child will definitely have a recessive trait?

FRAGMENTS AND RUN-ONS
i was taking a test online, and i think they gave me the wrong answers. Here take a look at the test and the answers if the answers are wrong, please cahnge them for me so i know the corrects answers!!! THANKS Fragments and Run-ons Post test Identify whether each group of ...

Science
In tha light wave above the property labeled A determines which characteristic of visible light? Brightness Speed Reflection Color**** The a is from the crest to the next crest and the A is in the middle of it??

science
Circle all of the following that go through active transport. a)osmosis b)endocytosis c)diffusion d)exocytosis Please help me, I'll greatly appreciate it! :)

science
Predict how the range of the projectile will change when you change the angle from 45∘, keeping the speed constant. Predict how the range of the projectile will change when you change the angle from , keeping the speed constant. A. It increases with either an increase or...

Science Help
i know that the half life of strontium 90 half-life is 28.8 but how can i explain this???

Science
Explain why chlorine (Cl²) is a gas at room temperature, but at sodium chloride (NaCL) is a solid at room temperature.

Computer Science
On python/pyscripter using the turtles i have to write a program that has 3 functions: drawA(), drawB(), drawC() each draw a letter and advance the turtle on to where the next letter will begin. Once these functions are working correctly, have your program write "ABCBA" I have...

science
First, you will investigate purely vertical motion. The kinematics equation for vertical motion (ignoring air resistance) is given by y(t)=y0+v0t−(1/2)gt2, where y0=0 is the initial position (which is 1.2 m above the ground due to the wheels of the cannon), v0 is the ...

science
Four racecars are driving at constant speeds around a circular racetrack. The data table gives the speed of each car and each car’s distance from the center of the track at one instant. Car Speed (m/s) Position (m) A 40 20 B 40 25 C 50 20 D 50 25 Rank the cars’ ...

Science
Acrostic Statement from the word Bacteria pls. :)

Science
How did the brightness or intensity of the light change as the degree of tilt increased? Which degree of tilt produced light similar to what North America experiences in the summer? What would be the effect on the seasons and the northern and southern hemispheres if earth were...

Science
How did the numbers of squares inside the outline change as the degree of tilt increased? Please help me!

science help PLS
When nuclear fusion begins, what can be said about the internal processes within that star? Atoms in the star begin to split. Atoms in the star begin to combine. The star is turned into a nebula. The star is turned into a blue giant. is it b

Science
Calculate the resultant of force of 200 N due west and a force of 90 N at 60 degree NW

Uttarpara Govt.High School,physical science
There is a solution of 50 gm Pb(NO3)2 & 75 ml boiled water.If the solution is taken to the temperature at 20°c then what quantity of Pb(NO3)2 will come out from the solution if the solubility of Pb(NO3)2 in water at 20°c is 54.

science
1. Compare the natural greenhouse effect with the human-induced process.

literature
Sharing the names of the authors and illustrators allows children to see: A. that books are created by people. B. that books are real. C. that writing books can be a profession. D. that illustrating books can be a profession. I would think its A Having students visit a petting...

literature
Literature supports the building of a readers’s imagination because: A. readers are placing themselves into a story. B. readers relate only to what they know. C. readers are presented with an unstructured picture of life. D. readers are seeing worlds they already know. A? Mr...

literature
You can often use literature in math, science and social studies to: A. entertain kids who finish their work. B. keep students quiet after a test. C. broaden the study of a topic. D. encourage kids to read nonfiction C ?

science (I NEED BACKUP!!!)
1. Which is the most complete model of feeding relationships? a.) food web b.) food chain c.) food pyramid d.) all of the above 2. _____ eat consumers only, while _____ eat both consumers and producers. a.) Producers; carnivores b.) Carnivores; omnivores c.) Herbivores; ...

Science
I need to know what type(s) of research method this study used. In the study, participants were asked questions before and after receiving a treatment. The catch is that this study had no control group, so the results were gathered from comparing participants feelings before ...

Science
How much graphite carbon must be burned in oxygen gas to produce 2.2 grams of carbon dioxide gas

science
I did a physics experiment and now i need help with the matlab fit. can someone tell me how to do this fit in matlab? a1*[sin(a2(x-a3))/(a2(x-a3)]^2*[cos(a4(x​-a3))]^2 i have a program that fits a graph to a function i just ask how to write this function.

science
an object is placed 10 cm in front of a plane mirror. where is the image formed ?how far is it from the mirror

blue eagle high

science
a body having a mass of 10kg is moving with velocity of 15m/s.calculate its momentum

science
what would happen if there is no revolution?

Science
The town of Seaside needs to build a new power plant. The old coal burning plant produces too much pollution and is no longer safe. The mayor decides that he will do some research on alternative forms of energy like nuclear power plants and solar power plants. What types of ...

Science
what are some scientific experiments ideas My teacher told me I could do a scientific experiment following the scientific method.

science help PLS
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...

SCIENCE PLZ HELP
2. What are the greenhouse gases? Which one is the biggest concern?

science
A man throws over a cliff and hears it strike at the bottom in 8 second. The temperature is 25 C. what are the two times ; the time that the stone travels and the time that sound travels ? what is the height of the cliff in meters?

SCIENCE PLZ HELP
1. Compare the natural greenhouse effect with the human-induced process

Science
Why the átomo never seen before

Computer Science
(From Lesson 17 of Blue Pelican Java) Use the following code for problems 1 – 15. In each problem state what’s printed. String s = “Lucky hockey puck”; String m = “uck”; int j = 6, z = 99; 1. int k = s.indexOf(m); System.out.println(k); 2. int k = s.indexOf(“uck...

Phyical Science
The town of Seaside needs to build a new power plant. The old coal burning plant produces too much pollution and is no longer safe. The mayor decides that he will do some research on alternative forms of energy like nuclear power plants and solar power plants. What types of ...

MUBANGA CHIPOYA DAY SCO SCHOOL,SCIENCE
GIVE THE UNITS IN WHICH WE MEASURE ,MESS ,WEIGH

science
Hanna is comparing a rock from a riverbed and a rock deep from undergroung. one is very smooth, and the other has a very rough edges. explain why each rock was proabley found in that location