Monday
May 2, 2016

# Posts by Kristie

Total # Posts: 130

Physics
In a double-slit experiment, the fourth-order maximum for wavelength of 450 nm occurs at an angle theta = 90. Thus it is on the verge of being eliminated from the pattern because theta cannot exceed 90. (a) What range of wavelengths in the visible range (400-700 nm) are not ...
March 13, 2016

Math
98 x .06 =
March 13, 2016

algebra
The population of a particular country was 29 million in 1985; in 1997, it was 38 million. The exponential growth function describes the population of this country t years after 1985. Use the fact that 12 years after 1985 the population increased by 9 million to find k to ...
February 29, 2016

A recipe serves 12 people and requires 1/5 cup of eggs. If you wanted to make the same recipe to serve 4 people, how many cups of eggs would you need? Show your work.
February 29, 2016

math
And armored truck left a federal bank at noon when a shipping error was discovered an agent was sent by helicopter to overtake the truck the helicopter left at 1:48 PM and flew at an average speed of 170 km/h. If the truck was overtaken at 3:24 PM what was the average speed of...
August 12, 2015

math 107
Use the following diagram of a flowerbed of petunias to answer the following questions. This diagram is a rectangle with ½ a circle on each end. The circle diameter is 22 feet, while the length of the rectangle is 60 feet. If you draw an X in the middle of the rectangle...
February 23, 2015

Chemistry
How many kilocalories of heat are released when 125 g of water cools from 100.0oC to 19.5oC?
June 20, 2013

Chemistry
Why is it important to identify the limiting reactant in stoichiometry?
March 5, 2013

physics
A 297-kg motorcycle is accelerating up along a ramp that is inclined 25.9° above the horizontal. The propulsion force pushing the motorcycle up the ramp is 3156 N, and air resistance produces a force of 300 N that opposes the motion. Find the magnitude of the motorcycle&#...
September 25, 2012

Physics
Consider the equation v = 1/4zxt^2. The dimensions of the variables v, x, and t are [L]/[T], [L], and [T], respectively. The numerical factor 4 is dimensionless. What must be the dimensions of the variable z, such that both sides of the equation have the same dimensions?
September 2, 2012

pathophysiology
Regarding lipoproteins: A) HDL promotes coronary artery disease B) The higher the ratio of lipid to protein, the higher the density C) LDL proportionately has more protein to lipids D) LDL is promotes coronary artery disease E) none are true
July 4, 2012

HUMAN DISEASES
WHAT IS THE Highly sensitive blood test and marker for myocardial infarction CALLED
July 1, 2012

HUMAN DISEASES
Regarding lipoproteins: A) HDL promotes coronary artery disease B) The higher the ratio of lipid to protein, the higher the density C) LDL proportionately has more protein to lipids D) LDL is promotes coronary artery disease E) none are true
July 1, 2012

physics
Sound waves have which of these properties? A) Reflection.B) All of these.C) Refraction.D) Interference.E) Capable of producing beats.
April 30, 2012

physics
If you double the frequency of sound, you also double which of the following?A) All of these.B) None of these.C) wavelength.D) amplitude.E) speed.
April 30, 2012

physics
If you double the frequency of sound, you also double which of the following? A) All of these.B) None of these.C) wavelength.D) amplitude.E) speed.
April 30, 2012

physics
Is it true that all radio waves are faster than all sound waves—no exceptions? A) False always.B) True, in most common cases.C) False in some cases.D) True in all cases.
April 29, 2012

physics
Beats in sound are the result of which of the follwing wave? A) resonance.B) refraction.C) reflections.D) amplitude changes.E) interference
April 29, 2012

physics
Frequency and period are related, in that they are which of the following?A) inverses of each other.B) None of these.C) both on the same wavelength.D) directly proportional to each other.E) two expressions for much the same thing.
April 29, 2012

physics
Rank the speed of sound through the following from greatest to least:A. HeliumB. Benzene C. Mercury
April 29, 2012

physics
An astronaut on the Moon attaches a small brass ball to a 1.00- m length of string and makes a simple pendulum. She times 15 complete swings in a time of 75.0 seconds. From this measurement she calculates the acceleration due to gravity on the Moon. What is her result?
April 29, 2012

physics
A certain radar installation tracks airplanes by transmitting electromagnetic radiation of wavelength 4.0 cm. a)Find the frequency of this radiation. b)Find the time required for a pulse of radar waves to reach an airplane 4.8 km away and return.
April 29, 2012

physics
A sonic boom is produced by an aircraft when it does which of the following? A) flies faster than sound continuously.B) None of these.C) All of these.D) first exceeds the speed of sound and breaks the sound barrier.E) pulls out of a subsonic dive.
April 29, 2012

physics
Frequency and period are related, in that they are which of the following?A) inverses of each other.B) None of these.C) both on the same wavelength.D) directly proportional to each other.E) two expressions for much the same thing.
April 29, 2012

physics
Consider a wave that travels a distance of 3 meters in 1 second with a frequency of 2 hertz. What is its amplitude? A) 4 meters.B) 2 meters.C) Not enough information is given.D) 3 meters.E) 1 meter.
April 29, 2012

physics
The feature that our eyes are most sensitive to seeing is which of the following? A) edges or boundaries.B) images that fall on the blind spot.C) gray areas.D) anything at the periphery.E) all light of moderate intensity.
April 29, 2012

physics
it marked me wrong on answering C, the upper atmosphere
April 29, 2012

physics
Light has a maximum constant speed in which of the following? A) water.B) red glass.C) the upper atmosphere.D) clear glass.E) between the atoms in glass, water, or the atmosphere. IS THIS C THE UPPER ATMOSPHERE?
April 29, 2012

physics
IT MARKED THIS ANSWER WRONG
April 28, 2012

physics
The finding that light in free space has one speed, and one speed only, is consistent with ____________________. A) the conservation of energy as shown by Maxwell.B) general relativity.C) Newton's laws of motion.D) electromagnetic induction. My book tells me it is A and D ...
April 28, 2012

physics
1909, Robert Millikan was the first to find the charge of an electron in his now-famous oil-drop experiment. In that experiment tiny oil drops were sprayed into a uniform electric field between a horizontal pair of oppositely charged plates. The drops were observed with a ...
April 20, 2012

physics
In periods of peak demand, power companies lower their voltage. This saves them power (and saves you money!). To see the effect, consider a 1200- W coffeemaker that draws 10 A when connected to 120 V. Suppose the voltage is lowered by 13 % to 104 V.(Caution: The 1200- W label...
April 20, 2012

physics
In periods of peak demand, power companies lower their voltage. This saves them power (and saves you money!). To see the effect, consider a 1200- W coffeemaker that draws 10 A when connected to 120 V. Suppose the voltage is lowered by 13 % to 104 V.(Caution: The 1200- W label...
April 19, 2012

physics
never mind wrong question
April 18, 2012

physics
thanks so much How many extra electrons are on this particular oil drop (given the presently known charge of the electron)?
April 18, 2012

physics
Given that the power consumed by a device is 1000 W operating on a 70-V line, calculate the amount of current it draws.
April 18, 2012

physics
thanks so much How many extra electrons are on this particular oil drop (given the presently known charge of the electron)?
April 18, 2012

physics
8 1/2 HRS ON THIS MASTERING PHYSICS WOW n 1909, Robert Millikan was the first to find the charge of an electron in his now-famous oil-drop experiment. In that experiment tiny oil drops were sprayed into a uniform electric field between a horizontal pair of oppositely charged ...
April 18, 2012

physics
GOT IT THANKS ..FINALLY 1.1*10^14
April 18, 2012

physics
Electronic types neglect the force of gravity on electrons.To see why, compute the force of Earth's gravity on an electron and compare it with the force exerted on the electron by an electric field of magnitude 6000 V/m (a relatively small field). The mass of an electron ...
April 18, 2012

physics
Charge polarization is normally produced by ____________________. A) nuclear interactions.B) contact.C) induction.D) friction.E) electrostatic means.
April 13, 2012

physics
To say that charge is conserved is to say that charge ____________________. A) is transferred, but never created or destroyed.B) is stored and never lost.C) None of the above.D) remains the same, whatever occurs physically.E) All of the above.
April 13, 2012

physics
The number of electrons that move about the nucleus of an electrically neutral atom is the same as the number of ____________________. A) protons in the nucleus.B) quarks in the nucleus.C) protons + neutrons in the nucleus.D) neutrons in the nucleus.E) None of these
April 13, 2012

physics
NO WAY TOUCH IT???
April 10, 2012

physics
Touch a 5000-V charged balloon and you're not harmed because, although the energy/charge ratio is high, there is ____________________. A) very little conduction of electricity.B) very little energy on the balloon.C) no way this large amount of energy can transfer under ...
April 10, 2012

physics
Electric potential is measured in units of ____________________. A) watts.B) joules per coulomb, or volts.C) joules.D) ohms.E) amperes.
April 10, 2012

physics
Which of these are correct for an electric field? A) It's a vector quantity, and can be cancelled.B) Three of three are correct.C) It stores electric energy.D) Two of three are correct.E) It's the altered space surrounding electric charge.
April 10, 2012

physics
Charge polarization is normally produced by ____________________. A) nuclear interactions.B) contact.C) induction.D) friction.E) electrostatic means.
April 10, 2012

physics
On a perfect fall day, you are hovering at low altitude in a hot-air balloon, accelerated neither upward nor downward. The total weight of the balloon, including its load and the hot air in it, is 24000 N. Find the weight of the displaced air. I got the weight=2.4×10^4 N...
April 1, 2012

physics
its telling me this is wrong
March 31, 2012

physics
In a 25 degree C room, hot coffee in a vacuum flask cools from 72 degree C to 54 degree in 8 hours.Find its temperature after another 8 hours.
March 31, 2012

physics
On a perfect fall day, you are hovering at low altitude in a hot-air balloon, accelerated neither upward nor downward. The total weight of the balloon, including its load and the hot air in it, is 24000 N. Find the weight of the displaced air. I got the weight=2.4×10^4 N...
March 31, 2012

physics
it is telling me its wrong
March 31, 2012

physics
What would be the final temperature of a mixture of 50 g of 15 degrees C water and 50 g of 40 degrees C water?
March 29, 2012

physics
What are the temperatures for freezing water and boiling water on the Kelvin temperature scale? a)273K for freezing water; 373K for boiling water b)0K for freezing water; 100K for boiling water c)32K for freezing water; 212K for boiling water
March 29, 2012

physics
On a perfect fall day, you are hovering at low altitude in a hot-air balloon, accelerated neither upward nor downward. The total weight of the balloon, including its load and the hot air in it, is 24000 N. Find the weight of the displaced air. Find the volume of the displaced ...
March 28, 2012

physics
Consider an airplane with a total wing surface of 90 m^2. At a certain speed the difference in air pressure below and above the wings is 4.2% of atmospheric pressure. Find the lift on the airplane.
March 28, 2012

physics
The weight of the atmosphere above 1 m^2 of Earth's surface is about 100,000 N. Density, of course, becomes less with altitude. But suppose the density of air were a constant 1.2 kg/m/s^3. Calculate where the top of the atmosphere would be.
March 28, 2012

physics
A mountain-climber friend with a mass of 82 kg ponders the idea of attaching a helium-filled balloon to himself to effectively reduce his weight by 25% when he climbs. He wonders what the approximate size of such a balloon would be. Hearing of your physics skills, he asks you...
March 28, 2012

physics
Estimate the buoyant force that air exerts on you. (To do this, you can estimate your volume by knowing your weight and by assuming that your weight density is a bit less than that of water.) Assume that your weight is a about 1000 N, for example.
March 28, 2012

physics
Your friend of mass 80 kg can just barely float in freshwater.Calculate her approximate volume.
March 27, 2012

physics
A 6.2kg piece of metal displaces 0.80 L of water when submerged.Find its density.
March 27, 2012

physics
Can anyone help me on this one???????The temperature at the bottom of Lake Tahoe in the Sierra Nevada Mountains of California is 4°C year round. In which country is water at the bottom of lakes normally higher than this? A) Russia.B) Great Britain.C) New Zealand.D) Tibet.E...
March 27, 2012

physics
Suppose that you balance a 6kg ball on the tip of your finger, which has an area of 1 cm^2 Find the pressure on your finger.
March 27, 2012

physics
The temperature at the bottom of Lake Tahoe in the Sierra Nevada Mountains of California is 4°C year round. In which country is water at the bottom of lakes normally higher than this? A) Russia.B) Great Britain.C) New Zealand.D) Tibet.E) Singapore.
March 25, 2012

physics
The ocean level rises when global temperature rises, due to ____________________. A) Both of these.B) Neither of these.C) melting of ice caps at the poles.D) thermal expansion of water
March 25, 2012

physics
The difference between energy radiated from the sun and energy radiated from the Earth has to do with ____________________. A) Neither of these.B) Both of these.C) radiation frequencies.D) the amounts of radiant energy.
March 25, 2012

physics
1. Temperature is distinguished from heat when we note that whereas temperature is ____________________. A) None of these.B) measured in degrees, heat is measured in units of energy.C) a measure of average translational kinetic energy per molecule, heat is energy that moves ...
March 25, 2012

physics
Temperature is distinguished from heat when we note that whereas temperature is ____________________. A) None of these.B) measured in degrees, heat is measured in units of energy.C) a measure of average translational kinetic energy per molecule, heat is energy that moves from...
March 24, 2012

physics
The ocean level rises when global temperature rises, due to ____________________. A) Both of these.B) Neither of these.C) melting of ice caps at the poles.D) thermal expansion of water.
March 24, 2012

physics
The temperature at the bottom of Lake Tahoe in the Sierra Nevada Mountains of California is 4°C year round. In which country is water at the bottom of lakes normally higher than this?A) Russia.B) Great Britain.C) New Zealand.D) Tibet.E) Singapore nowhere in the book, notes...
March 24, 2012

principles of physics
Temperature is distinguished from heat when we note that whereas temperature is ____________________. A) None of these.B) measured in degrees, heat is measured in units of energy.C) a measure of average translational kinetic energy per molecule, heat is energy that moves from ...
March 24, 2012

physics
Which of the following 1-gram blobs of water has the least surface area? A) All have about the same surface area.B) A spherical blob.C) A blob stretched into a thin film.D) A pancake shaped blob.E) An ellipsoid-shaped blob.
March 19, 2012

physics
Which floats with most of its volume below the surface? A) None of these.B) An oak log.C) All of these.D) An iceberg.E) A mountain range.
March 19, 2012

principles of physics
For which of these will the buoyant force be the same as its weight when placed in water? A) A match stick.B) All of these.C) A small rock.D) None of these.E) A nail.
March 19, 2012

principles of physics
Blood pressure is normally greater in your ____________________. A) arms.B) legs.C) head.D) feet.E) All the same
March 19, 2012

principles of physics
my last one!! Calculate the force of gravity between a newborn baby of mass 2.9 kg and the obstetrician of mass 100 kg, who is 0.58 m from the baby.
March 9, 2012

principles of physics
this is how I did these but I get an overflow error in my calculator
March 9, 2012

principles of physics
Calculate the force of gravity between Earth and the Sun (the Sun's mass = 2.0×10^30 kg; average Earth-Sun distance = 1.5×10^11 m).
March 9, 2012

principles of physics
Calculate the force of gravity between a newborn baby (mass = 2.6 kg) and the planet Mars (mass = 6.4 * 10^23kg) when Mars is at its closest to Earth (distance = 5.6 * 10^10m).
March 9, 2012

MATH HELPPPP
5 isnt one of the choices..
February 27, 2012

MATH HELPPPP
in the diagram below, <G and <H are complementary. What is the measure of G? a)20 b)30 c)40 d)50 inside G they have a problem saying (2x+10)degrees. i relly need help into solving these kind of problems trying to find degrees of each angle but i cant remember the ...
February 27, 2012

MATHH
in the diagram below, <G and <H are complementary. What is the measure of G? a)20 b)30 c)40 d)50 inside G they have a problem saying (2x+10)degrees. i relly need help into solving these kind of problems trying to find degrees of each angle but i cant remember the ...
February 27, 2012

Math
in the diagram below, <G and <H are complementary. What is the measure of G? a)20 b)30 c)40 d)50 inside G they have a problem saying (2x+10)degrees. i relly need help into solving these kind of problems trying to find degrees of each angle but i cant remember the formula...
February 27, 2012

statistics
Suppose that weights of 5th grade elementary boys are normally distributed with mean µ =90 lbs and variance ó2 = 4 lbs. Find the weight that corresponds to Q3 and interpret this measure of position.
November 28, 2011

statistics
if 1 adult male is randomly selected and is assumed to have 20 lb of carry on baggage, find the probabilty that his total is greater than 195 lb
November 9, 2011

chemistry
a rectangular block of the element barium is 5.00cm long , 3.00cm wide and 1.00cm high and it weighs 52.5g. what is the density of the element barium?
September 27, 2011

chem
a rectangular block of the element barium is 5.00cm long , 3.00cm wide and 1.00cm high and it weighs 52.5g. what is the density of the element barium?
September 27, 2011

physics
A 56 kg bungee jumper jumps from a bridge. She is tied to a bungee cord whose unstretched length is 11 m, and falls a total of 38 m. Calculate the spring stiffness constant k of the bungee cord, assuming Hooke's law applies. Calculate the maximum acceleration she ...
February 28, 2011

Physics
Ummm no one else is using this computer. I am the only one using it. It may be people from my class, because its a large lecture and the teacher mentioned this site today. Now I want to tell the professor to never recommend this site again.
February 28, 2011

Physics
I don't know about Kathleen or Lauren or whatever I just had a question about this problem. I really didn't know what to do and thought maybe this site could help, but if people like this answer maybe this isn't where I should come for help.
February 28, 2011

Physics
A 67 kg hiker climbs to the top of a 3700 m-high mountain. The climb is made in 5.5 h starting at an elevation of 2800 m. Calculate assuming the body is 16% efficient, what rate of energy input was required.
February 28, 2011

Algebra
Solve 16 - 2(8w-7)= 3w - 18(2-w)
December 17, 2010

geometry
Given: ÚA≅ÚBDE; AB x DE = AD x BD Prove: AB x CD = AD x BC
December 16, 2010

college
Translate to an equation: r \$2 roses and t \$2.50 tulips total \$30 graph the equation and use the graph to determie three different combinations of roses and tulips that total \$30.
December 15, 2010

college
use the five steps for problem solving. the average of two test scores is 79. if one test score is eleven less than the other, what are the two test scores?
December 8, 2010

medical
c)the report said the patient died on january 15
August 14, 2010

medical
which one of the following statements is an example of hearsay? a)i saw the doctor administer the injection.b)i checked the patients blood pressure three times.c)the report said the patient died on january 15.d)the report was on my desk when i arrived for work.
August 14, 2010

Math 116 algebra
I would like an example of how to set it up. Thank you
February 23, 2010

math
2009 Dodge Nitro, It gets 21 mph on the highway and 16 in town. I am having a hard time on setting up the equation. I know that x = miles driven on 60 gal of gas, and the milage on the Nitro
February 17, 2010

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