Science

Recent Questions

Science
Which of the following best describes the result of using a catalyst in a chemical reaction? A. The yield of product is increased. B. A more desirable product is often formed. C. A greater amount of heat energy is released by the reaction. D. The reaction is completed in a ...

please help
The chart below shows the highest quiz score Cynthia received in four of her classes. Class Highest Quiz Score English 13 out of 14 correct Science 93% Math 25/27 History 0.93- In which class did she have the highest score?

Science.
Think about renewable sources of energy that are avaible. Which renable energy sources will you use: A. To heat or cool? B. To provide hot water in your home? C.to provide electricity in your home? Can you give a site on renable sources or help me understand? Because Im ...

i dont know how to solve this
The chart below shows the highest quiz score Cynthia received in four of her classes. Class Highest Quiz Score English 13 out of 14 correct Science 93% Math 25/27 History 0.93- In which class did she have the highest score?

Pure maths, Life science, tourism and geography
What are the careers that i might be able to do after school?

Science
the description of the structure of the atom is called the....

Science
I have a exam coming up,my final grade is 67% and I was wondering what would my mark have to be on my exam to overall pass with atleast 75%?

science
What would be the volume of hydrogen(2g/mol) needed in a balloon to lift a 50kg man? Assume that the temperature is 300K pressure is 1atm and air has average mass of 29 g/mol and that both gases behave ideally.

Science(physics)
A spring 20cm long is stretched to 25cm by a load of 50N. What will be its length when stretched by 100N assuming that the elastic limit is not reached? I want the answer abd solving to this question and also the formula for young modulus of elasticity

health
what education is required for dentist? Do i put answer like math, science what certain certificate do you need for this job? Do i put Bachelor's Degree?

History,life science,maths lit and geography
I wanna knw if ican become a FIRE FIGHTER with dic sub

Science
The length of an aluminium bar of lenth 80cm increase by 1mm on heating. What is the final temperature of the bar if it was initially at temperature 20°C? ( given: coefficient of linear expansion of aluminium = 25×10-6/° C)

Science
The speed of light in a plastic material is 1.4 x 10^8. What is the index of refraction of the material?

Science
Why are gender roles considered socially constructed, according to the text? (Points : 1)

philosophy
Russell is arguing that philosophy is valuable. You'll want to think about his argument using his own key ideas: •How does he think philosophy is different from science? •Does he think philosophy is different from science in a good or bad sense, like one is better than the...

Science Help
What happens to the density of the air in the balloon as it is heated?

Maths lit, geography ,agricultural science. Life science
Hi i am a grade 11 learner at khumbula senior high school , i want to know which career path do i take with this subjects ?

Maths lit, geography ,agricultural science. Life science
Hi i am a grade 11 learner at khumbula senior high school , i want to know which career path do i take with this subjects ?

math literacy,english,afrikaans,l.o,l.s,bus
Can you become a social worker with the following subjects maths literacy, english,afrikaans,life orientation,life science,business and history are can you tell u what can you become with that subjects above

science
a runner travels 3 kilometers in 30 minutes. what is the speed of the runner

maths literacy,life science,history,agricultural science
people can you plz help me what can I study after matric,anyone who could help me?

science
A cannon, mass 500kg, fires a bullet, mass 100kg, horizontally so that the velocity of the bullet is 100m.s^-1 to the right. calculate the recoil velocity of the bullet

physical science
what will the velocity be if the momentum is 60000 kg m/s and the mass of the car is 2000kg

science
A gas at atmospheric pressure is compressed isothermally to one third of its volume. What is final pressure?

computer science visual basic
I need help Application: Create a GeneratedNumber application that stores in an array with indexes 1 through 100 numbers generated by the index values when Generate is clicked. Generate the number to be stored at each index by summing the index and it's individual digits. For ...

Science
A boy moves on a skateboard at a constant velocity of 3m.s . The combined mass of the boy and the skateboard is 40kg. He catches a bag of flour of mass 5kg that is thrown to him horizontally at 6m.s . Determine the velocity of the boy after catching the bag of flour.

maths literacy, history, grography, life science
What are careers of general geography?

earth science
During the early Paleozoic era, South America, Africa, Australia, Antarctica, India, and perhaps China comprised the vast southern continent of _____. (1 point) Europe Gondwana Laurasia Pangaea

Science (physics)
How does temperature affect the gas in a balloon?

SCIENCE HELP PLS
The density of gas particles in a section of Earth’s atmosphere decreases. Which of the following is the most likely explanation for this event? The air pressure in that section of Earth’s atmosphere decreased. The air pressure in that section of Earth’s atmosphere ...

science
The following forces act on a body:f1=5,3N upwards;f2=2,2N upwards and f3=10,7N downwards.determine the resultant of the three forces using vector addition

Science
a simple machine that only changes the direction of the applied force?

Pure Maths, Life Science, CAT, Business Studies
I would like to know that with these subjects what can I study at University , so can you please help me with that?

Maths literacy and tourism,life science,geography
Hi help me I do not know what job I can do with these subjects

science
On heating 10grams copper sulphate crystals (CuSO4.5H2O),6.4 grams anhydrous sulphate was left .Find the value of X .

science
what wt. of hno3 is required to make 1lt. if 2N solution to be used as an oxidising agent 3cu+8HNO3=3cuno3+2NO+4H2O

Math literacy, Geography, Life science, Agriculture
Which career path can i follow with the subject above

science
I really need help, I don't understand the question from my science assignment. If anyone is available that would be great.

science
How much energy would be required to raise the temperature of 1.25g of water from 17 to 31 degree celsius.

Science help please.....
What happens to the density of the air in the balloon as it is heated? Also, based on this question.... What would be the Independent variable, Depended Variable, controlled Variab

science
which of the following is a constant, or control variable, in this experiment?

science
Does carbon dioxide or water have a higher boiling point and why?

Science
Without this system in the body, you would get really sick because toxins and waste would build up? (A) Cardiovascular (B) Excretory (C) Integumentary (D) Muscular I think its A, I really need this answered.

Science
What will happen when the sun is exposed to oxygen

science
Na+H2o->NaOH+H2

Science
Which of the following determines the type of biome classification that will be made for a particular region? Climate Size Mineral deposits Number of human settlements Think about how the amount of energy changes as you move stepwise from producers to primary consumers to ...

Science
Which of the following can be used to explain why fossils of the same kind of organisms can be found in different regions of the world? Biogeography Adaptation Continental drif Dispersal Which of the following would best explain why a species of wildflower native to ...

Science
Certain seismic waves travel as.. A) electromagnetic and transverse waves. B) visible light and longitudinal waves. C) longitudinal and transverse waves. D) compression and visible light waves. I have no idea I never learned this:(

Science
When the energy of a light wave is transferred to a particle and causes it to vibrate and generate heat, the energy of the light wave is.. A) absorbed B) reflected C) refracted D) transmitted D?

science
When_____forces act on an object, they cause the object to move. A. Balanced B. Unbalanced C. friction D net B?

science
Which direction will the box move in the diagram below? (Its a square in the middle and it has a long arrow pointing to it on the left side which is 5 N and then on the right side theirs a short arrow pointing to it which is 3 N) A. It will move to the left. B. It will move to...

physical science
When will the resultant of the two vectors be at a maximum?

Science
Hi if you know about static electricity can you explain how lightning strikes form? Can you think about when lightning occurs to formulate your answer to my question please. Thank you so much!!!

Physical science and math
2a^2*3a^3*b^0

Physical science and math
2x^2y.4x^4y^3/6x^6y^6

Science HELP
Placental mammals develop _______ A) In an egg laid in water B) A pouch of their mother's body C) Inside the mother's body**** D) Inside an amniotic egg

Math literacy,Life science,Geography and Tourism
Im a grade ten learner and ii wud really like to know,uhm which careers will this subjects give me..im confused

Science
Two forces of 60N and 80N act simultaneously at a point dertermine their resultant by using tail to head method

Maths,Geography,life science
I am a grade 11 learner doing maths,life science,geography . What causes do my subjects fit

Maths,Geography,life science
Um a grade 11 learner doing maths,life science,geography . What causes do my subjects fit

science
A 10 ohms, 8 ohms, and 5 ohms resistor connected in series to a Volts source. Find the current in each resistor.

Science
Which piece of children's play ground equipment could be used to model and explain the movement of matter in the biosphere? Slide Merry-go-round Swing Seesaw

Science
State how matter moves through the biosphere. State how energy moves through the biosphere. Explain each statement using examples to illustrate your explanation.

Science
What does the term adaption mean? How does adaption explain the patterns of distribution of plant and animal species in the world?

Science
What happens to the density of the air in the balloon as it is heated? Also, based on this question.... What would be the Independent variable, Depended Variable, controlled Variable...

Science help....
What happens to the density of the air in the balloon as it is heated?

science help
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
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 help
A student did an experiment with two identical plants, Plant 1 and Plant 2. About 10 mL fertilizer was added to Plant 1. About 200 mL of water was added to each plant every day. The height of the plants was recorded over a period of 5 weeks in the table shown below. Week ...

science help PLS
Scientists earlier believed that the lowest measurable temperature is the freezing point of ice. However, modern scientists believe that temperatures below the freezing point of ice can also exist. What best accounts for these different opinions? scientists propose ...

science help
Two scientists did the same experiment but arrived at different results. The scientists most likely did not have accurate data and information misunderstand each other's interpretations belong to different backgrounds did not have instruments to take accurate measurements IS IT A

Life science,geography,business and maths literacy
Am in grade 10 and i don't know what to study for at vasity

Science
1. In the western U.S., ranchers aggressively killed wolves because they posed a threat to their cattle. As the wolf population declined, the deer population began increasing. As a result, the surrounding forest ecosystems experienced increasing damage. The large number of ...

Science
which of the following is an example of a cyclic behavior that is seasonal? a. running from predators b. searching for water c. hunting at night d. migrating for warmth** I think its d

Science
can you help me in mater and energy

Geography,maths literecy,life-science,agriculture,LO,sepedi and english
Which career can suit me?

Science
Suppose you have a 50.0g sample of ice at -30.0 C. How many joules of heat energy are needed to heat the ice to 0.0 C? How many joules of heat energy are needed to melt the ice? I do not know how to set either of these up.

Science
How to balance reaction of solid calcium carbide (CaC2) with excess water to form acetylene gas (C2H2) and solid calcium hydroxide?

Physical Science
What force is needed to give a 0.25-kg arrow an acceleration of 196 m/s2? A. 0.25 N B. 49 N C. 196 N D. 748 N ___________________________________ I said 49N because F = MxA. Am I correct?

Science
1.What information would a scientist need to discover whether a disorder had a genetic cause, an environmental cause, or a combination of the two? 2.How do mutations affect an organism? Why can some mutations have no effect? 3.Which of these traits or behaviors is most likely ...

science
What does the statement "the properties of salt are different from the properties of the elements that go into making them" mean?

Science
What information would a scientist need to discover whether a disorder had a genetic cause, an environmental cause, or a combination of the two?

science
What information would a scientist need to discover whether a disorder had a genetic cause, an environmental cause, or a combination of the two?

Science
Can someone help me with this, at least help by explaining a bit what is going on? question: What is going on in the diagram? Picture: It's a boat floating on water, but another one on the ocean floor. A. the waves are pointing down to the boat that is on the floor and C. is ...

math
Lydia wrote 4.5 pages on her science report in 1 hr.What was her writing rate in pages per minute?

Science
My granddaughter has to do a project about a product she would create and test we've decided on the safetyof white paper napkins vs dyed ones I don't know where to begin please help

Child Development
I need help finding a learning experience for science/ sensory activity. The age is 3 years old.

science
An object of mass 0.5kg is rotated in horizontal circle by a string of length 1m,the maximum tension in the string before it breaks is 50N.What is the greatest number of revolution per second of the object?

Science
The hypothesis is tested and found to be correct. Define a problem Observe the problem Hypothesis becomes a theory*** Make a prediction

Science
This is a critical part of the process that verifies that the predicted outcome is valid. Test the hypothesis*** Make a prediction Hypothesis becomes a theory Observe the problem

Science
This step includes recording data, taking photos, and coordinating information. Make a hypothesis Make a prediction Observe the problem*** Define a problem

Science
The science team uses information to suggest the main outcome of the hypothesis. Make a Prediction*** Test the hypothesis Observe the problem Define a problem

Science
Select the factor that most affects the environment. rain humans*** sunlight oxygen

Science
Select the factor that most affects the environment. weather*** land oceans research

Science
Select the factor that most affects the environment. domestication oxygen time*** wind

Science
How can two tall pea plants produce a small pea plant

Art
Which of the following most influenced the art of tessellation Language Arts Social Studies Science Mathematics••

Science 7
What is an advantage of the zygospores of it is extremely dry or hot?

Math
1. Write a ratio and a percent for the shaded area. a 4x4 grid with 5 blocks shaded (1 point) one over five, 25% five sixteenths, 31.25% one over four, 20% one over four, 25% 2. Model 32% on a 5 × 5 grid. (1 point) a 5 by 5 grid has 8 cells shaded. a 5 by 5 grid has 6 cells ...

math help..STEVE
Hi i need help on this Test, near my answers! hopefully they show uP! THANKS SOOOOOOO MUCH *huggy* Write a ratio and a percent for the shaded area. a 4 x 5 grid with 6 blocks shaded (1 point) 6 over 25, 30% 3/50, 6% 6 over 25, 24% 3/10, 30% 3. Write the ratio as a percent. In ...

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