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August 23, 2014

Homework Help: Computers: Computer Science

Recent Homework Questions About Computer Science

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SCience
The purpose of surfactant in the lungs is to A. facilitate lung expansion. B. bind oxygen from the air. C. improve lung blood flow. D. remove pollutants in the air. I believe it's A
Wednesday, July 23, 2014 at 9:26pm

Biology/Science
Which of the following processes produces haploid gametes? A. Meiosis B. Fertilization C. Mitosis D. In!@#$%^&tion I think A
Wednesday, July 23, 2014 at 9:23pm

Science/Biology/Physics
1. Giraffes have long necks that allow them to reach more food sources in their habitat. The long neck trait is an example of A. selection. B. adaptation. C. radiation. D. homology. 2. Which of the following is the most common kind of chemical bond in biological molecules? A. ...
Wednesday, July 23, 2014 at 6:54pm

science
A mass m=5.2 kg is attached to the end of a spring with a spring constant of k=15.6 N/m. The mass moves through a viscous damping medium with a damping constant b=1.8 kg/s giving a velocity dependent damping force Fdamp= -bv. The motion occurs in zero gravity so set the force ...
Wednesday, July 23, 2014 at 3:32pm

Science
What should be the focal length of a double concave length 60 that an object placed 25 cm from it will produce 3/4 times large as the object?
Wednesday, July 23, 2014 at 9:51am

science
three point charges are located on the positive y-axis of a coordinate system.charge q1 = -2.09 nC is 2.05 m from the origin and charge q2 = +2.70 nC is 3.25 m from the origin, and the third charge q3 = -2.56 nC is located 5.03 m on the positive y-axis.the fourth charge q4 = -...
Wednesday, July 23, 2014 at 9:27am

science
how much heat will be carried by 4 gm aluminium at 40 C temperature?
Wednesday, July 23, 2014 at 12:36am

science, physics
A 4 μC point charge is on the x-axis at 1.1 m, and a 3 μC point charge is on the x-axis at 2.7m. Find the magnitude of the net electric field at the point on the y-axis where y = 3.7 m . The value of the Coulomb constant is 8.98755 × 109 N · m2/C2. ...
Tuesday, July 22, 2014 at 7:09pm

Math
#1 Mr. Jones got a loan for a sum of money, and at the time of repayment he owed $75 in interest. Mr. Brown borrowed three times the amount of money Mr. Jones had borrowed at the same rate of interest for twice as long a time. How much interest does Mr. Brown pay? #2 Mr. Baker...
Monday, July 21, 2014 at 10:46pm

science
A hoop of mass M = 4 kg and radius R = 0.4 m rolls without slipping down a hill, as shown in the figure. The lack of slipping means that when the center of mass of the hoop has speed v, the tangential speed of the hoop relative to the center of mass is also equal to vCM, since...
Monday, July 21, 2014 at 2:06pm

science
1o grams of caster sugar dissolved in 25 degrees long to does it take.
Sunday, July 20, 2014 at 11:36pm

Maths lit,tourism.agricultural , life science
Which career do i qualify to study with these subjects at TUT or collega
Sunday, July 20, 2014 at 5:12pm

science
A hoop of mass M = 4 kg and radius R = 0.4 m rolls without slipping down a hill, as shown in the figure. The lack of slipping means that when the center of mass of the hoop has speed v, the tangential speed of the hoop relative to the center of mass is also equal to vCM, since...
Sunday, July 20, 2014 at 2:35pm

business math
The Consumer Electronics show reports that the HP Spectre laptop computer starts at $99.70 for a base configuration. The model displayed at its recent show costs $1,361, $124 more than the comparable 13-inch Apple MacBook Air. If Computers-R-Us buys the HP Spectre at the show ...
Sunday, July 20, 2014 at 1:27pm

science
does density affect weight?
Saturday, July 19, 2014 at 1:20pm

math
Last month, Nate spent 12% of his paycheck on car repairs and 25% of the remainder on food. He gave $1,320 of the remaining money to his parents and then bought a computer on sale. If the usual price of the computer was $825 and the discount was 20%, how much money did Nate ...
Friday, July 18, 2014 at 1:16pm

math
Last month, Nate spent 12% of his paycheck on car repairs and 25% of the remainder on food. He gave $1,320 of the remaining money to his parents and then bought a computer on sale. If the usual price of the computer was $825 and the discount was 20%, how much money did Nate ...
Friday, July 18, 2014 at 12:19pm

maths lit, geography, life science, history, life orientation, english, tswana
what can I do with my life with all this subjects that I studied?.
Friday, July 18, 2014 at 10:39am

Science
A ray of light approaches a jar of honey at an angle of 30.0 degrees. If the angle of refraction is 19.5 degrees, what is the refractive index of honey?
Thursday, July 17, 2014 at 11:15pm

Science
What is the index of refraction of a material if the angle of incidence in air is 50 degrees and the angle of refraction in the material is 40 degrees? Please show steps.
Thursday, July 17, 2014 at 8:35pm

Science
. A researcher wants to develop a new pharmaceutical compound to treat pain. Which of the following strategies will likely be the most effective process? A. Test extracts from newly discovered plants for pain-killing substances. B. Read anthropological studies to discover ...
Thursday, July 17, 2014 at 7:02pm

Science
Fitness is a result of which of the following factors? A. Overproduction B. Adaptation C. Variability D. Homology I think it is B
Thursday, July 17, 2014 at 6:57pm

Science
What is one qualitative factor and one quantitative factor that affect the refraction of light as it passes from one medium to another?
Thursday, July 17, 2014 at 4:50pm

science
A runner whose mass is 49 kg accelerates from a stop to a speed of 6 m/s in 3 seconds. (A good sprinter can run 100 meters in about 10 seconds, with an average speed of 10 m/s.) (a) What is the average horizontal component of the force that the ground exerts on the runner'...
Thursday, July 17, 2014 at 4:40pm

Science
What are the affects when posting warning signs where there is a history of wildlife collisions. Please explain using jot dots please .
Thursday, July 17, 2014 at 1:57pm

Science
You are a scientist hired by the ministry to investigate its anti-collision strategies. Choose one of the five strategies above. Outline a procedure to test how well the strategy works. I've chosen adding highway lighting to improve night visibility. But how do I start it ...
Thursday, July 17, 2014 at 11:42am

Science
Which of the government strategies for reducing collisions listed below might be the most effective? Explain your answer. a. Installing fencing along major highways b. Draining salty ponds near highways c. Posting warning signs d. Adding highway lighting to improve night ...
Thursday, July 17, 2014 at 11:07am

science
How does coronary artery disease affect normal homeostasis of the cardiovascular system
Thursday, July 17, 2014 at 9:00am

Science
a jogger with a mass of 60.0kg is moving at a speed of 3.0m/s. what is the jogger's kinetic energy? KE=270 joules Can you show me the steps to this answer please.
Wednesday, July 16, 2014 at 10:36pm

science
At a murder scene, you have started making an image of a computer’s drive. You’re in the back bedroom of the house, and a small fire has started in the kitchen. If the fire can’t be extinguished, you have only a few minutes to acquire data from a 10 GB hard disk...
Wednesday, July 16, 2014 at 3:19pm

science
A horizontal spring-mass system has low friction, spring stiffness 210 N/m, and mass 0.6 kg. The system is released with an initial compression of the spring of 11 cm and an initial speed of the mass of 3 m/s. suppose that there is energy dissipation of 0.02 J per cycle of the...
Wednesday, July 16, 2014 at 2:57pm

science
The cider is heated from an initial temperature of 4°C to a final temperature of 65°C. The steam enters the heat exchanger as 50% quality steam and exits as water condensate at 85°C. Calculate the mass of steam required to heat 150 kg of cider. (For the cider, ...
Wednesday, July 16, 2014 at 10:24am

Science
Fitness is a result of which of the following factors? A. Overproduction B. Adaptation C. Variability D. Homology I think it is B. not sure
Tuesday, July 15, 2014 at 7:25pm

Science
A researcher collects high-resolution photographs of the Earth taken from outer space at annual intervals for the last decade. This data would be most useful to analyze which of the following? A. Human movement during crises B. Migration patterns of large whales C. ...
Tuesday, July 15, 2014 at 6:58pm

Science
Experiments cannot validate hypotheses, only falsify them. The statement above can be restated in which of the following ways? A. Until disproved, an explanation for an observation is valid. B. Certain concepts cannot be subjected to direct experimentation. C. A hypothesis ...
Tuesday, July 15, 2014 at 6:58pm

science
Calculate the volume of a graduated cyclinder that has a radius of 10 mm and a height of 120 mm.
Tuesday, July 15, 2014 at 11:53am

science
why should you not attempt to take a picture of fluorine?
Monday, July 14, 2014 at 9:23pm

science
homogenized milk is composed of microscopic globules of fat suspended in a watery medium. is homogenized milk a true solution?
Monday, July 14, 2014 at 9:21pm

science
element 118 was reportedly synthesized in 1999, but the claim was later retracted. as a consequence of that experiment, element 116 was discovered. to what period and group would each of these two elements belong, and what known elements should each resemble?
Monday, July 14, 2014 at 9:20pm

Science
A test is performed to see if applying fertilizer to rose bushes increases the number of flowers on bushes. Which of the following best relates to the hypothesis for this experiment? A. Watering all of the rose bushes the same amount throughout the experiment B. Predicting ...
Monday, July 14, 2014 at 8:03pm

science
Determine the percent composition of sodium hydrogen carbonate. Na H C O3 1*22.999 1*1.008 1*12.011 3*15.999 22.999 1.008 12.011 47.997 /84.015 /84.015 /84.015 /84.015 .2737 .0120 .1430 .5713 *100 *100 *100 *100 27.37% 1.2% 14.3% 57.13% did i do this correctly?
Monday, July 14, 2014 at 8:01pm

science
what is the correct number of protons, neutrons and electrons in a neutral Cadmium-112 atom?
Monday, July 14, 2014 at 7:57pm

science
Name the ionic compound form when a Magnesium reacts with chlorine?
Monday, July 14, 2014 at 6:18pm

Science
A student is assigned the task of measuring the mass of one tennis ball using a scale for which the zero adjustment on the balance is not working. The student is given three balls and the can in which they were packaged. Which of the following strategies will provide the best ...
Monday, July 14, 2014 at 5:31pm

Pre algebra
Will has a mean score of 62 on the first five test in science. if he gets a 50 on the next test what will his mean be then?
Monday, July 14, 2014 at 1:51pm

Science
There are two set pieces in a theater sitting on platforms with wheels. One is a tree with a mass of 50 kg. It is moving at 3 m/s. The other is a fence with a mass of 30 kg. If the two set pieces have equal momentum, how fast is the fence moving? A. 3 m/s B. 5 m/s C. 30 m/s D...
Monday, July 14, 2014 at 9:24am

science
the potential energy of an electron in H-atom is -13.6eV.if the potential energy of an electron in He+ ion is -3.4eV ,what would be the excited state of He+?
Monday, July 14, 2014 at 4:18am

science
Unit 33 discusses a natural way to reinforce science process skills and introduces the scientific method. This strategy, especially appropriate for primary grades, is to have children do which one of the following?
Sunday, July 13, 2014 at 6:12pm

Science
Two students collect information about the number of dandelions in a park. Based on their sampling, they estimate that there are 900 dandelions in the 300-square-meter city park. To determine the accuracy of their estimate, which of the following questions is necessary? A. ...
Sunday, July 13, 2014 at 1:27pm

Science
. A population shows the following annual data: 3% emigration 2% immigration 2% births 1% deaths Which of the following is the change in population at the end of the year? A. 3% decrease B. 2% increase C. 1% decrease D. No change I think it is not change.
Sunday, July 13, 2014 at 12:27pm

Science
An experienced mountaineer decides to climb Mount Everest using the same route in the same season and with similar materials and equipment used by a fatal1924 expedition. The scientific purpose of such a climb would be to A. show that modern technology makes climbing safer. B...
Sunday, July 13, 2014 at 11:41am

Science
In developing countries, which of the following factors correlates with high birth rates? A. Increased availability of contraception B. Increased education and standard of living C. High infant mortality rate D. High availability of postnatal care
Sunday, July 13, 2014 at 11:40am

Science
. A study demonstrates that treatment of peptic ulcers with antibiotics results in improvement in a large number of patients. This implies that A. antibiotics neutralize stomach acid. B. these ulcers are caused by a bacterial infection. C. pressure ulcers can be treated in the...
Sunday, July 13, 2014 at 11:39am

Science
A researcher wants to develop a new pharmaceutical compound to treat pain. Which of the following strategies will likely be the most effective process? A. Test extracts from newly discovered plants for pain-killing substances. B. Read anthropological studies to discover plants...
Sunday, July 13, 2014 at 11:37am

Science
Which of the following procedures is an appropriate negative control for testing the hypothesis that air contains bread mold spores? A. Seal slices of bread in a container to minimize air contact. B. Place slices of bread in a refrigerated environment. C. Add ingredients to ...
Sunday, July 13, 2014 at 11:36am

Science
A cylinder and an airtight piston are used in the following experiment. The piston is pushed up and down in the cylinder and the resulting pressure of the air inside the cylinder is measured with a pressure gauge. The results of the experiment are recorded in the following ...
Sunday, July 13, 2014 at 11:32am

science
Plane sound wave of frequency 500 Hz fall normally on a smooth wall.At what distance from the wall will the air particles have maximum and minimum amplitude of vibration and the velocity of sound in air may be taken as 340 meter per second.
Sunday, July 13, 2014 at 8:07am

science
how would you go about locating the magnetic north pole assuming it were still on land?
Saturday, July 12, 2014 at 3:23pm

science
what happens when you cut a bar magnet in half? if it were continually cut in half, then would it finally yield two magnetic monopoles?
Saturday, July 12, 2014 at 3:22pm

science
Why when you look at a window from the inside at night, two similar images, one behind the other, are often seen?
Saturday, July 12, 2014 at 2:54pm

science
if the Moon's spherical surface gave specular reflection, what would it resemble at full moon?
Saturday, July 12, 2014 at 2:52pm

science
why do the tones sound full and rich when you sing in the shower?
Saturday, July 12, 2014 at 2:48pm

science
how fast would a "jet" fish have to swim to create an "aquatic" boom?
Saturday, July 12, 2014 at 2:47pm

science
the speed of sound in air is given for still air. how would wind affect the speed? what would happen if you shouted into the wind?
Saturday, July 12, 2014 at 2:47pm

science
A half-life of mercury-195 is 31 hours. If you start with a sample of 5.00g of pure mercury-195, how much of it will still be present after 93 hours?
Friday, July 11, 2014 at 8:23pm

science
Is this balanced correctly NaOH + H2SO4 = Na2SO4 + H2O? In this equation, Sodium (Na) and Hydrogen (H) atoms are not balanced. There are 2 atoms of Sodium (Na) on Right Hand Side, so we can multiply NaOH with 2 on Left Hand Side. This balances the Sodium (Na) atoms. Now, ...
Friday, July 11, 2014 at 8:22pm

science
Explain the process of reflection.
Friday, July 11, 2014 at 7:39pm

science
A car traveling about 50km/h collides head-on with something solid. The car crumples, slows down and stops. Use the law of inertia to explain why a crash dummy not restrained by a seat belt in the car slams into the steering wheel.
Friday, July 11, 2014 at 4:13pm

science
Explain why radioactivity can be used as a "clock" to measure the march of geologic time.
Friday, July 11, 2014 at 3:52pm

science
What is the Molarity of a solution formed by mixing 10.0g H2SO4 with enough water to make 100.0mL of solution?
Friday, July 11, 2014 at 1:42pm

science
how is this equation derived from the momentum principle? In the near-Earth orbit the rate of change of momentum is (v/R)p = (v/R)mv
Friday, July 11, 2014 at 11:13am

science
Mufaddal wants to travel from point H to point F as shown in image. How many ways can he travel from point H to point F if moving north and west directions are not permitted? 12 7 10 4
Friday, July 11, 2014 at 10:01am

Math literacy business studies life science and history
Hi i was wondering which career path should i follow if im doing these subjects
Friday, July 11, 2014 at 7:15am

science
Mufaddal wants to travel from point H to point F as shown in image. How many ways can he travel from point H to point F if moving north and west directions are not permitted? 12 7 10 4
Friday, July 11, 2014 at 5:02am

science
What is the Molarity of a solution formed by mixing 10.0g H2SO4 with enough water to make 100.0mL of solution?
Friday, July 11, 2014 at 2:49am

science
Sodium hydrogen carbonate NaHCO3, also called baking soda, is an active ingredient in some antacids used for the relief of indigestion. Determine the percent composition of sodium hydrogen carbonate.
Friday, July 11, 2014 at 2:46am

Physics
Actually, I have 3 questions to solve. I know the 1st one requires Coulomb's constant, but I just can't get the formula to work. Ditto for the formulas for the other 2 questions. 1) A 6.3 μC point charge and a −1.7 μC point charge are separated by a ...
Thursday, July 10, 2014 at 10:35pm

Science
Make a flowchart to show how the event m might affect a forest ecosystem. A logging company clear-cuts the trees in the forest. My question is; What are the events that might affect a forest ecosystem when clear-cutting the trees in the forest?
Thursday, July 10, 2014 at 12:40pm

Science
What body system does coronary heart disease affect? Also How does this disease affect normal homeostasis of the body system
Thursday, July 10, 2014 at 11:30am

Science
State in words the specific information conveyed by a label reading of 0.25M oxalic acid
Tuesday, July 8, 2014 at 6:56pm

science
A comet is in an elliptical orbit around the Sun. Its closest approach to the Sun is a distance of 4.8 x10^10 m (inside the orbit of Mercury), at which point its speed is 9.1 x10^4 m/s. Its farthest distance from the Sun is far beyond the orbit of Pluto. What is its speed when...
Tuesday, July 8, 2014 at 5:37pm

Environmental Science
In two or three well-developed paragraphs, summarize how the reproductive behavior of individuals can affect the growth rate of their population.
Tuesday, July 8, 2014 at 9:09am

science
A student expends 9.6W of power lifting a textbook 0.50m in 3.0s with a constant velocity. How much work is done?
Tuesday, July 8, 2014 at 3:01am

science
How much heat must be removed from 0.20kg of water at 10.0oC to form ice at 0oC?
Tuesday, July 8, 2014 at 3:00am

Environmental Science
Using two or three well-developed paragraphs, explain how temperature and precipitation determine which plants grow within an area and give an example.
Monday, July 7, 2014 at 9:55am

Environmental Science
Using two or three well-developed paragraphs, describe how energy is transferred from the sun to producers and on to consumers. Provide at least one example.
Monday, July 7, 2014 at 9:53am

Science
how many ml of water are present in 250ml of a 15% by volume oguous hydrocloric acid solution?
Monday, July 7, 2014 at 9:44am

English Essay Part 2
Background Your favorite cousin has moved to your town and is looking for a job. Her previous experiences are working as a cashier and sales clerk at two department stores. You know she plans to apply at similar stores in your town. But you also know she is a perfect match for...
Monday, July 7, 2014 at 9:28am

Science
by volume ogueous hydroloric acid solution,
Monday, July 7, 2014 at 9:08am

Science
A solution made up of 20ml of mythl alcohol and 50ml of water. What is the volume percent of ethyl alcohol in solution.
Monday, July 7, 2014 at 9:05am

Science
80ml of methyl alcohol water are mixed to give a solution that has a final volume of 154ml. What is the concentration of the solution expressed as percent by volume methyl alcohol?
Monday, July 7, 2014 at 9:03am

Science
How many grams of sucrose are dissolved in 400 grams of a 12% ogueaus solution of sucrose?
Monday, July 7, 2014 at 9:01am

Science
A solution is prepared by dissolving 15grams of table salt in 70grams of water. Find (a) mass percent of solute (b) mass percent of solvent.
Monday, July 7, 2014 at 8:58am

Science
What is the mass percent of sodium hydroxide in a solution that is made by dissolving 8grams of sodium hydroxide in 50 grams of H2O?
Monday, July 7, 2014 at 8:52am

science
In the construction of bridges and skyscrapers, gaps must be left between adjoining steel beams to allow for the expansion and contraction of the metal due to heating and cooling. The temperature of a sample of iron with a mass of 10.0g changed from 50.4oC to 25.0oC with the ...
Sunday, July 6, 2014 at 10:25pm

Maths lit,geography,life science,pysical science
Provide five or more ways in which you critically discuss how life style/behaviour disease impact on the teenager?
Sunday, July 6, 2014 at 3:46pm

science
An object with mass 110 kg moved in outer space. When it was at location < 11, -35, -7 > its speed was 17.5 m/s. A single constant force < 230, 420, -230 > N acted on the object while the object moved to location < 16, -41, -13 > m. What is the speed of the ...
Sunday, July 6, 2014 at 2:31pm

computer
how do cell phone works,answer in short paragraph
Sunday, July 6, 2014 at 2:02am

SCIENCE
a force of 70N keeps a 70-kg pilot in circular motion if he is flying a small plane at 35 m/s in circular path, what is the radius of the circular path?
Saturday, July 5, 2014 at 10:34pm

science
Do houseplants affect the quality of air in a house? Describe an experiment that would answer this question. What gases do you want to measure? I answered yes since plants give off oxygen which animals need to survive. I need a little help with the experiment.
Friday, July 4, 2014 at 5:21pm

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