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October 20, 2014

Homework Help: Science

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physical science
The present record for the 100 meter dash is 9.58 seconds. back in 1988, Johnson ran the 100 meter dash in the world record time of 9.79 seconds. He was later to lose both his record and his gold medal to runner up Lewis because of steroid use. Calculate Johnson's average ...
Thursday, September 18, 2014 at 12:08am

physical science
Superfly, mass of only 1 gram, but capable of flying at the incredible speed of 840 million km/hr, meets a locomotive with a mass of 20,000 kg, traveling at 40km/hr. Who has the greater momentum?
Thursday, September 18, 2014 at 12:07am

Physical Science
at a speed of 30 mi/hr, the car crashes head on into a brick wall. despite the fact that the car crunched to a total stop, one of NEWTON'S laws predicts that you will continue to fly forward at 30 mi/hr until you collide with the windshield or dash. WHICH LAW?
Thursday, September 18, 2014 at 12:05am

science/math
If a car can go from 0 to 60mi/hr in 8.0 seconds, what would be its final speed after 5.0 seconds if its starting speed were 50mi/hr? My answer was -10, is this correct. If not , I need help
Wednesday, September 17, 2014 at 10:37pm

Science
how might the extinction of a deer or a rabbit impact the ecosystem in which it lives?
Wednesday, September 17, 2014 at 10:35pm

Science
What are 3 facts that show ticks have a parasitic relationship with deer? 1..Ticks live on the skin of anomals
Wednesday, September 17, 2014 at 9:58pm

Science
1. What is the symbiotic relationship between a barnacle and a whale? How could you prove that the whale is not harmed? Commensalism
Wednesday, September 17, 2014 at 9:22pm

science
you and your brother are pushing a car with a dead battery. You exert forces of 20n and 25n in the same direction. What is the force applied on the car?
Wednesday, September 17, 2014 at 9:03pm

Science
1.what chemical properties of nail polish remover makes it dangerous? 2.Surgeons sometimes use metal plates and screws to hold broken bones together. What chemical properties do you think the metal should have?
Wednesday, September 17, 2014 at 8:59pm

Physical Science
Superfly, mass of only 1 gram, but capable of flying at the incredible speed of 840 million km/hr, meets a locomotive with a mass of 20,000 kg, traveling at 40km/hr. Who has the greater momentum?
Wednesday, September 17, 2014 at 8:49pm

Physical Science
The present record for the 100 meter dash is 9.58 seconds. back in 1988, Johnson ran the 100 meter dash in the world record time of 9.79 seconds. He was later to lose both his record and his gold medal to runner up Lewis because of steroid use. Calculate Johnson's average ...
Wednesday, September 17, 2014 at 8:45pm

Science
what chemical properties of nail polish remover makes it useful?
Wednesday, September 17, 2014 at 8:41pm

physical science
one gallon= 3.785 liters. If you were charged $1.10 per liter at the pump for Regular, how much would you be paying per gallon? Assuming American price levels, do we stop at this station or drive on?
Wednesday, September 17, 2014 at 8:29pm

Physical Science
You are driving. You have enough gas in your tank to go 50 miles. The next town is 72 kilometers away. Can you make it? Show work.
Wednesday, September 17, 2014 at 8:26pm

Science
Classify each as a physical characteristic or chemical property. -wood burns -clay is brown -steel wool rusts -a paper clip is 3cm long
Wednesday, September 17, 2014 at 8:20pm

Science
John took 45 minutes to bicycle to his grandmothers house a total of four kilometers what was his velocity in km hr?
Wednesday, September 17, 2014 at 8:12pm

science
How to manipulate the formulas of momentum, fore, acceleration
Wednesday, September 17, 2014 at 6:33pm

science/math
If a car can go from 0 to 60mi/hr in 8.0 seconds, what would be its final speed after 5.0 seconds if its starting speed were 50mi/hr? dont know what equation to use. please help
Wednesday, September 17, 2014 at 5:31pm

science
am confused. dont know what formula to use for this problem. A car traveling at a speed of 30.0m/s encounters an emergency and comes to a complete stop. How much time will it take for the car to stop if it decelerates at -4.0m/s?
Wednesday, September 17, 2014 at 5:09pm

physical science
the distance from one place to another is 80 miles. How far is it in kilometers?
Wednesday, September 17, 2014 at 4:02pm

Physical Science
Ok, I just want to make sure I am doing this right. It says mass= 3800grams. Silvers density is 10 grams/cm^3. How much will volume of water with silver displace in cm^3? So would it be 3800g/10g= 380 grams? or is that wrong?
Wednesday, September 17, 2014 at 4:00pm

Physical Science
Suppose an all good crown has mass m=3800 grams. Gold has a density of 19 grams/ cm^3. What is the volume of water displaced by a gold crown (in cm^3)? Please help :)
Wednesday, September 17, 2014 at 3:18pm

phsical science
Chemical changes _____.
Wednesday, September 17, 2014 at 2:58pm

Science
Put the following in the correct order. Report results Determine if hypothesis is true Do background research Construct a hypothesis Collect data Analyze results and draw conclusions Design and implement an experiment State the problem / ask questions Correct Order State the ...
Wednesday, September 17, 2014 at 11:37am

Physical Science
A 73.0 g silver spoon at 19.2 c is place in a cup of coffee at 91.2 c. How much heat does the spoon absorb from the coffee to reach a temperature of 85.6 c?
Wednesday, September 17, 2014 at 10:15am

Physical Science
A 1600.0 kg car with a speed of 75.0 km/h brakes to a stop. How many cal of heat are generated by the brakes as a result?
Wednesday, September 17, 2014 at 10:12am

Physicsl Science
A heat pump releases 103.0 kcal as it removes 54.0 kcal at the evaporator coils. how much work does this heat pump ideally accomplish? Answer should be in KJ
Wednesday, September 17, 2014 at 9:24am

Physical Science
please help me understand this question If measurements of a gas are 50L and 300 kilopascals and then the gas is measured a second time and found to be 75L, describe what had to happen to the pressure (if temperature remained constant). Include which law supports this ...
Tuesday, September 16, 2014 at 11:04pm

science
In general, what would a scientist do after forming a testable question? A. Design an experiment B. Develop a hypothesis C. Draw a conclusion D. Analyze data I think A because he has already done his hypothesis (my original answer. if not, B.
Tuesday, September 16, 2014 at 8:51pm

Science! Help!
A student hypothesizes that a goldfish will be more active in a bowl that has red gravel than in a bowl with grey gravel. To test this hypothesis, the student places on goldfish in a bowl with red gravel and another in a bowl with grey gravel. The color of the gravel is the ...
Tuesday, September 16, 2014 at 6:59pm

science
A drinking glass at a crime scene contains a clear colorless liquid that may be water or alcohol. As the investigator, you know that the densities of alcohol, water, and ice are 0.79g/mL, and 0.92/mL. Design a simple method to determine the identity of the mystery liquid. ...
Tuesday, September 16, 2014 at 6:52pm

Science
aluminum has a density of 2.7g/cm3 while copper has a density of 8.96g/cm3. Which metal would you choose to build a model airplane? why?
Tuesday, September 16, 2014 at 6:48pm

Science
the density of liquid mercury is 13.53 g/cm3.The density of a solid copper is 8.96 g cm3. would you expect a piece of copper to sink or float when placed in a container of liquid mercury?
Tuesday, September 16, 2014 at 6:45pm

Science
A student hypothesizes that a goldfish will be more active in a bowl that has red gravel than in a bowl with grey gravel. To test this hypothesis, the student places on goldfish in a bowl with red gravel and another in a bowl with grey gravel. The color of the gravel is the ...
Tuesday, September 16, 2014 at 6:30pm

Science!
If a bowling ball were moved from Earth to the moon, how would it's weight and mass change? A. The bowling ball would weigh the same, but it's mass would increase. B. The bowling ball would weigh the same, but it's mass would decrease. C. The bowling ball would ...
Tuesday, September 16, 2014 at 5:37pm

Science
Which component of the technological system is achieved when an automobile airbag inflates? A. Input B. Feedback C. Process D. Output Is the answer B?
Tuesday, September 16, 2014 at 5:31pm

science
dentify the fruit or vegetable you selected and relate the second law of thermodynamics to the changes in energy observed in Appendix C. Consider how did the amount of energy gained compare to the amount of energy lost as heat at the second through fourth trophic levels? ...
Tuesday, September 16, 2014 at 3:05pm

science
Suppose you place a 30kg weight 50cm from the pivot where should the following forces be applied to lift the load a)a 100N force b)a 150N force 2)how far will the load in question 1 be lifted if: a)the 100N force moves downwards b)the 150N force moveddownwards 1m
Tuesday, September 16, 2014 at 1:27pm

science
suppose you place a 30kg weight 50cm from the pivot, where should the following forces be applied to lift the load (a)a 100N force (b)a 150N force
Tuesday, September 16, 2014 at 1:17pm

Science
What are two examples of Mutualism, Commensalism and Parasitism?
Monday, September 15, 2014 at 10:13pm

Physical Science
Why does a glass filled with a cold beverage seem to sweat? a. saturation always results in sweat on wet object. b. the cold glass adjacent air to saturation, which is followed by condensation of water vapor. c. when cold, water molecules can move through tiny pores in the ...
Monday, September 15, 2014 at 9:32pm

Physical Science
A heat engine exhauts 122.0 kal after taking 499.0 how much mechanical work was done by the engine?
Monday, September 15, 2014 at 8:50pm

Science(Stuff to do like with magnets!)
1. A positively charged test object is moving toward the positive source charge in an electric field. What happens next??? A. its potential energy decreases. B. Its potential energy increases. C. Its potential energy stays the same. D. Its potential energy become the negative...
Monday, September 15, 2014 at 8:39pm

Science
1. Why do scientists use models of natural systems? (1 point) Scientists use models of natural systems because these systems are often too large, too small, or too complex to study directly. Scientists use models of natural systems because they like to use art in science. ...
Monday, September 15, 2014 at 3:04pm

Sience Plase help check my answers
1. Why do scientists use models of natural systems? (1 point) Scientists use models of natural systems because these systems are often too large, too small, or too complex to study directly. Scientists use models of natural systems because they like to use art in science. ...
Monday, September 15, 2014 at 2:19pm

science
2.750 g of copper(II) oxide, CuO2, was reduced by heating at high pressure with excess hydrogen to yield 2.196 g of copper Cu.
Monday, September 15, 2014 at 1:48pm

Earth Science
7. The original location of an earthquake is also known as the A. hotspot. B. magnitude. C. horizon. D. epicenter.
Monday, September 15, 2014 at 1:18pm

Science
Which of the following is the longest divison of the geologic time? a) Period b) Epoch c) Era d) Year I have already looked in my book, I cant figure it out. Can somebody help me?
Monday, September 15, 2014 at 9:29am

Science
Where did scientist get information to develop the geologic time scale? a) They collected and studied rock samples in Africa. b) They studied rock layers and index fossils around the world. c) They conducted research at libaries. d) They didn't have any information; they ...
Monday, September 15, 2014 at 9:21am

Science
The geologic time scale originally ordered earth's rocks by? a) Absolute age. b) Relative age. c) Composition. d) Decades and centuries.
Monday, September 15, 2014 at 9:15am

Science
How should the solution of the (Fe(H2O)5(SCN)2+ complex be disposed of?
Monday, September 15, 2014 at 7:06am

Science
Propose a series of concentration to be used for calibration curve. If an unknown solution produced a result outside the range of the calibration curve, how could this be solved?
Monday, September 15, 2014 at 7:05am

Science
To determine Kf you will need to know the total concentration of Fe3+ and SCN- present in the solution. calculate these concentration and record them in the result.(show your working for one of the example.
Monday, September 15, 2014 at 7:02am

science
calculate the mass in mg of solid chromium nitrate needed to make 250 ml of an aqueous solution with a pH OF 4.00. The Ka of [cr(H2O)6]+3 IS 1.0*10-4.
Monday, September 15, 2014 at 1:57am

computer science
Which of the following is a type of software program used to write code and develop other programs. A: a command line interpreter B: the turtle graphics window C: an operating system D: an integrated development environment Please help asap!
Monday, September 15, 2014 at 1:21am

COMPUTER SCIENCE
Which of the following is a type of software program used to write code and develop other programs. A: a command line interpreter B: the turtle graphics window C: an operating system D: an integrated development environment Please help asap!
Sunday, September 14, 2014 at 10:37pm

Grade 9 Science
In each situation s below , it seems that a new substance may have been produced. Explain why each situation represents a physical change. a) A tailor makes a new suit out of a piece of fabric. b) A chef makes a salad out of lettuce, tomatoes and cucumbers. I really need ...
Sunday, September 14, 2014 at 6:32pm

Science
Help me unscramble the words acnsrl spgei
Sunday, September 14, 2014 at 6:18pm

Science/physics
I done the problem and was wondering if my answer is right I got 1.87 and then 12.4 degrees above x axis please help At time t = 0 s, a puck is sliding on a horizontal table with a velocity 4.60 m/s, 32.0° above the +x axis. As the puck slides, a constant acceleration acts...
Sunday, September 14, 2014 at 3:27pm

Science
Suppose the atomic mass unit had been defined as 1/10 the average mass of an atom of phosphorus .what would the atomic mass of carbon be on this scale? What would Avogadro's number be ?
Sunday, September 14, 2014 at 9:29am

Science
An airplane lands with a velocity of 100m.s/1.The maximum rate at which it can slow down is 5,0m.s/2.What is the minimum time needed to come to rest, starting from when it first touches ground?
Sunday, September 14, 2014 at 7:21am

Science
What is the cell structure involved in photosynthesis and respiration? What is the starting materials and raw materials of photosynthesis and respiration? What is the end product of photosynthesis and respiration? What is the energy requirement of photosynthesis and respiration?
Sunday, September 14, 2014 at 1:58am

Physical science
A 3.0-kg cat runs to the left at 10m/s and a 12-kg dog runs to the right at 4.0m/s what is the total kinetic energy?
Saturday, September 13, 2014 at 10:12pm

Science
5. A team of scientists is testing a new drug on AIDS patients. They expect patients to develop fewer AIDS-related illnesses when given the drug, but they don't expect the drug to cure AIDS. Thought Process: a. What is the independent variable? New drug treatment b. What ...
Saturday, September 13, 2014 at 8:17pm

science
(1.b) Calculate your de Bröglie wavelength and momentum when you are driving a car at a speed of 104 km/hr (~65 mph), assuming your mass is 80 kg.
Saturday, September 13, 2014 at 6:19pm

Science
If you are riding your bike and hit a curb and stop suddenly at 25m/s when you hit the curb and it took you only .75 seconds to stop after hitting the curb. What was your acceleration?
Saturday, September 13, 2014 at 5:31pm

Physical Science
For questions #14 – 17, write an equation for the reaction of magnesium oxide with sodium chloride to produce magnesium chloride and sodium oxide. 14. Show the formulas of the reactants. 15. Show the formulas of the products. 16. Write the balanced the equation for this ...
Saturday, September 13, 2014 at 3:33pm

Physical Science
Please Help me with this question and example in full details please. Scientists tested the effect of a fertilizer on the growth of plants. They had 2 sets of plants, Group A which gets fertilizer, water and sun and Group B which gets only water and sun (but in equal amounts ...
Saturday, September 13, 2014 at 3:08pm

Science
what is spectral broadening
Saturday, September 13, 2014 at 12:46pm

engineering science
An object is kept in equilibrium on an incline by means of supporting force, which is at an angle of 30 degrees o the inclined. The weight of the obbject is 500N. The incline forms an angle of 45 degrees with the horizontal. The coefficent of the friction between the surfaces ...
Saturday, September 13, 2014 at 11:52am

science
Is it possible that free Internet content might one day replace textbooks?
Saturday, September 13, 2014 at 3:23am

The Curriculum
What is the best strategy to use when a teacher is providing for learning of physical knowledge as a part of science? A. Give detailed information by telling children about physical knowledge. B. Have someone demonstrate an experiment and debrief. C. Set up the materials and ...
Friday, September 12, 2014 at 9:57pm

Science
a body rolled on a surface with speed of 10m/s comes to rest after covering distance of 50 m find cofficient of friction
Friday, September 12, 2014 at 8:50pm

science
Turning on the switch in a flash light starts a chemical reaction in the batteries. The chemical energy is turned to light energy and the flashlight lights up. Which part of this an example of a process?
Friday, September 12, 2014 at 8:39pm

Veterinarian assisted
1. In the __________, an animal patient's hair is clipped and its skin is scrubbed to prepare for surgery.  A. hospital ward  B. surgical suite  C. treatment area  D. grooming area  2. Supervision of the treatment area is usually the responsibility...
Friday, September 12, 2014 at 6:17pm

science
what the heck ms.sue you literally skipped over my question. i've been next to my computer screen waiting for you to answer my question.
Friday, September 12, 2014 at 6:01pm

science
if the paramecium overheats, what could happen to the metabolism
Friday, September 12, 2014 at 5:37pm

computer science
Using visual logic build a program that asks the user for a whole number, N<100, determine how many quarters, dimes, nickels, and pennies make up N cents with the least amount of coins
Friday, September 12, 2014 at 5:33pm

Physical Science
Modern oil tankers weigh over a half-million tons and have lengths of up to one-fourth mile. Such massive ships require a distance of 4.8 km (about 3.0 mi) and a time of 22 min to come to a stop from a top speed of 26 km/h. (a) What is the magnitude of such a ship's ...
Friday, September 12, 2014 at 3:37pm

computer science
The problem is to calculate the usable area in square feet of a house. Assume that the house has a maximum of four rooms, and that each room is rectangular. I need help writing a program description,analysis,test,and with pseuocode with it.
Friday, September 12, 2014 at 1:21pm

computer science
In the Meteorological institute at Ruritania, one can find the following at Shiaho Railway Station in 2013 • In May 22 days with rainfall totaled 89 mm in that month • In June 1822 days with rainfall totaled 127 mm in that month • In Jule 8 days with rainfall ...
Friday, September 12, 2014 at 5:15am

computer science
Under the Von Neumann architecture, a program and its data are both stored in memory. It is therefore possible for a program, thinking a me mory location holds a piece of data when it actually holds a program instruction, to accidentally (or on purpose) modify itself. What ...
Friday, September 12, 2014 at 5:11am

computer science
CSI 16 1 Group Assignment 1 201 3 P age 2 of 6 1. 1. How many milliseconds (ms) are in 1 second? 2. How many microseconds are in 1 second? 3. How many nanoseconds (ns) are in 1 millisecond? 4. How many microseconds are in 1 millisecond? 5. How many nanoseconds are in 1 ...
Friday, September 12, 2014 at 5:10am

Science (college level)
1. What solar temp is needed for the peak intensity of radiation to occue at .2 micrometers? Remembering that humans can see light only between .4 and .7 microns, would the sun look brighter or dimmer at this new temp? 2. How much variation in earth orbital distance from the ...
Friday, September 12, 2014 at 5:07am

Science
Identify the dependent and independent variables in the following experiments. 1. Height of bean plants is recorded daily for 2 weeks. 2. Percent absorption by a pigment is measured for red, blue, green, and yellow wavelengths of light. My thought process: 1. a. Dependent: ...
Thursday, September 11, 2014 at 11:32pm

physical science
what causes friction?
Thursday, September 11, 2014 at 10:30pm

physical science
a bowling ball loses .5kg x m/s momentum as it hits bowling pins. how much momentum do the pins gain? please help
Thursday, September 11, 2014 at 10:27pm

Atmospheric Science
1. What solar temp is needed for the peak intensity of radiation to occue at .2 micrometers? Remembering that humans can see light only between .4 and .7 microns, would the sun look brighter or dimmer at this new temp? 2. How much variation in earth orbital distance from the ...
Thursday, September 11, 2014 at 9:27pm

Science
What is spectral broadening, Quasars, and the Expansion theory
Thursday, September 11, 2014 at 9:19pm

science
Suppose that a biologist states that the average height of undergraduate students at your university is 205 cm plus or minus a standard deviation of 17 cm. What does this mean? Does it mean that the height of undergraduates at the university ranges from 17 cm less that the ...
Thursday, September 11, 2014 at 8:13pm

Science
So what would you find something in the house? Product Symbols Precaution One example would be appreciated
Thursday, September 11, 2014 at 8:01pm

science
If you had an object that measured 4.0 cm for width,and 4.5 cm for height.how would you calculate the volume for this object?
Thursday, September 11, 2014 at 7:38pm

Science
What is red shifting and blue shifting
Thursday, September 11, 2014 at 6:17pm

Science
What is a protostar
Thursday, September 11, 2014 at 6:00pm

Science
What is apparent brightness and absolute brightness in Science
Thursday, September 11, 2014 at 5:50pm

Science - Please Check My Four Answers
Please help me with the following questions: 1. Which is usually the best way to present or communicate inferred data? A. in a bar graph B. in a data table C. in a simple diagram D. in a written paragraph I know the answer isn't C or D(I got C wrong), but now I think the ...
Thursday, September 11, 2014 at 5:43pm

science
Which of the following is a good study habbit.
Thursday, September 11, 2014 at 4:55pm

Science
What is the first step in the scientific method? (I WAS ABSENT DURING LESSON) A- Observation B- Hypothesis C- Conclusion D- Test
Thursday, September 11, 2014 at 4:52pm

Science - Please Check My Answers
Please help me with the following: Which is usually the best way to present or communicate inferred data? A. in a bar graph B. in a data table C. in a simple diagram D. in a written paragraph I know the answer isn't C or D(I got C wrong), but now I think the answer is B. ...
Thursday, September 11, 2014 at 3:52pm

science
Which of the following is an example of a physical system? hurricanes Volcanoes Glaciers Plant & Animal Communities ***All of the Above*** is it all of the above? Pls help asap!
Thursday, September 11, 2014 at 3:40pm

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