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November 23, 2014

Posts by Maria


Total # Posts: 1,550

Physics
A negatively charged balloon has 3.1 μC of charge. How many excess electrons are on this bal- loon? Answer in units of electrons.
March 7, 2011

Physics
A negatively charged balloon has 3.1 μC of charge. How many excess electrons are on this bal- loon? Answer in units of electrons.
March 7, 2011

Physics
A negatively charged balloon has 3.1 μC of charge. How many excess electrons are on this bal- loon? Answer in units of electrons.
March 7, 2011

Physics
A negatively charged balloon has 3.1 μC of charge. How many excess electrons are on this bal- loon? Answer in units of electrons.
March 7, 2011

Physics
A negatively charged balloon has 3.1 μC of charge. How many excess electrons are on this bal- loon? Answer in units of electrons.
March 7, 2011

Physics
Calculate the net charge on a substance con- sisting of a combination of 1.9 × 10^13 protons and 3.9 × 10^13 electrons. Answer in units of C.
March 7, 2011

java/programming
ask the user to enter his or her birthday in the MM/DD/YYYY format and output the number of days between the birthday and today. This gives the person's age in days.
March 7, 2011

Java/programming
write a program that determines the number of days in a given semester.
March 7, 2011

chemistry
what is a type III binary compound containing 3 atoms per molecule, with a total # of protons being 32? It's not Silicon dioxide, because SiO2 has 30 protons.. i need 32..
March 6, 2011

chemistry
what is a type III binary compound containing 3 atoms per molecule, with a total # of protons being 32? It's not Silicon dioxide, because SiO2 has 30 protons.. i need 32..
March 6, 2011

psychology
Which of the following individuals is thought to be driven by intrinsic needs? A. Cheerleader B. A junior varsity basketball player
March 3, 2011

geometry
The area of ETG is 400 square meters. To the nearest tenth of a meter , what is the length of side EG?
March 3, 2011

Physics
A 255 kg piano slides 4.3 m down a 30° incline and is kept from accelerating by a man who is pushing back on it parallel to the incline (Fig. 6-35). The effective coefficient of kinetic friction is 0.40. (a) Calculate the force exerted by the man. (b) Calculate the work ...
March 2, 2011

Physics
A 255 kg piano slides 4.3 m down a 30° incline and is kept from accelerating by a man who is pushing back on it parallel to the incline (Fig. 6-35). The effective coefficient of kinetic friction is 0.40. (a) Calculate the force exerted by the man. (b) Calculate the work ...
March 2, 2011

math
how do i rename mixed nimber in simplest form.15/8
March 1, 2011

physics
A shotputter accelerates a 7.3kg shot from rest to 14m/s. If this motion takes 2.0s what average power was developed?
February 28, 2011

physics
A(n) 0.163 kg baseball is thrown with a speed of 9.37 m/s. It is hit straight back at the pitcher with a final speed of 16.7 m/s. What is the magnitude of the impulse de- livered to the ball? Answer in units of kg · m/s.
February 27, 2011

Phyics
A ray of light strikes a mirror at an angle of 26 degrees to the normal. What is the angle of reflection? Answer in units of degrees .
February 27, 2011

Biological psychology
What does mitosis produce and how?
February 26, 2011

Biological Psychology
What is a good site for a simple explanation on chromosomes, meiosis, mitosis, etc as it relates to biological psychology? I have a college level test to study for, and I am really struggling with the complicated text in the book.
February 26, 2011

chemistry
Calculate the H3O^+ and OH^- ion concentrations in a solution that has a pH of 3.72.
February 26, 2011

economics
has any one solved the Tampa Tribune Vs. St Petersburg Times game theory problem?
February 25, 2011

Physics
A moving object has a kinetic energy of 138 J and a momentum of 23.9 kg·m/s. a) Find the speed of the object. Answer in units of m/s.
February 24, 2011

Physics
A ray of light is incident at an angle of 51.1 degrees on the surface of a piece of crown glass whose index of refraction is 1.52 degrees. What is the angle of refraction? Answer in units of .
February 24, 2011

Physics
A ray of light has an angle of incidence of 30.4 degrees on a block of quartz and an angle of refraction of 20.7 degrees. What is the index of refraction for this block of quartz?
February 24, 2011

Physics
If the speed of light through material Z is 2.5×10^8 m/s, what is this material’s index of refraction? The speed of light in a vacuum is 3 × 10^8 m/s.
February 24, 2011

physics
A sound wave traveling at 342 m/s is emitted by the foghorn of a tugboat. An echo is heard 2.50 s later. How far away is the reflecting object? Answer in units of m.
February 22, 2011

Physics
A moving object has a kinetic energy of 138 J and a momentum of 23.9 kg·m/s. a) Find the speed of the object. Answer in units of m/s.
February 22, 2011

college english 101
IM WRITING THE ESSAY ON PHYSICAL CHILD ABUSE. AND IM TRYING TO FIND HOW MUCH JAIL TIME SOMEONE GETS? I FOUND THE EFFECTS THE STATISTICS OF HOW MANY CASES THERES IS YEARLY, I FOUND INFO ON CPS
February 20, 2011

college english 101
okay one more why are child-abuse laws in this country to lenient for repead offenders
February 20, 2011

college english 101
okay i have to write an argumentative essay dealing with child abuse laws and how they are effective in the US and idk where to start of what should my thesis be? help please
February 20, 2011

physics
A ray of light has an angle of incidence of 30.4 degrees on a block of quartz and an angle of refraction of 20.7 degrees. What is the index of refraction for this block of quartz?
February 18, 2011

physics
If the speed of light through material Z is 2.5×108 m/s, what is this material’s index of refraction? The speed of light in a vacuum is 3 × 108 m/s.
February 18, 2011

Economics
At quantity of 8000, TR 3625, TC 3310, MR 100, MC 22 How many papers should the manager of El Dorado Star print and sell daily
February 18, 2011

history
what does the author of "the real story of jamestown" argue is the most tremendous change in the world next to the extinction of the dinosaurs?
February 17, 2011

biology
James D. Watson and Francis Crick in 1953 based on data produce by Rosalind Franklin
February 17, 2011

science
the moon rotates around the earth and not around itself, we always see the same side of the moon and can tell by the pattern of crater
February 17, 2011

Earth Science
need to find the mystery phrase made from the following letters DNALFOSSERGORPEGA
February 16, 2011

biochemistry
the answer is 50 g w/v = 50g/500 ml = 10%
February 16, 2011

biochemistry
answer is % (w/w) = 21g/(500ml x 1.12 g/ml) = 21/560 = 3.75%
February 16, 2011

biochemistry
17g/375ml = 0.453% (w/v)
February 16, 2011

Chemistry
You dilute 0.4 M salt to 0.13 M , this is a dilution factor of 3.077. Thus, to make 3 L of final solution, you need 3L/3.077 = 974 ml or 0.974 L
February 16, 2011

math
74
February 16, 2011

Physics
A glacier moves with a speed of 42 nm/s. How many years would it take for the glacier to move 0.78 km? Answer in units of yr.
February 14, 2011

Physics
A glacier moves with a speed of 42 nm/s. How many years would it take for the glacier to move 0.78 km? Answer in units of yr.
February 14, 2011

Physics
A glacier moves with a speed of 42 nm/s. How many years would it take for the glacier to move 0.78 km? Answer in units of yr.
February 14, 2011

math
i am sorry ms.sue i just changed because i ashamed that i always posted question on my homework and i afraid that anyone might not help my homework because of keep on posting but i really thanks to you and i hope you will help me to solve the problem i posted thanks and ...
February 13, 2011

math
hi to all teachers kindly please help me to solve this word problems thanks and god bless u always.question is below.i need for my homeworkpls. q.Saltly has a piece of cloth. She used 1/3 of the cloth to make a pillow cover and another 4/7 of the cloth to make a tablecloth. a...
February 13, 2011

PHYSICS PLEASE HELP
An astronaut in his space suit and with a propulsion unit (empty of its gas propellant) strapped to his back has a mass of 134 kg. During a space-walk, the unit, which has been completely filled with propellant gas, ejects some gas with a velocity of +32 m/s. As a result, the ...
February 9, 2011

Shurley English
warm hot cold
February 8, 2011

Economics
the price of labor is $100 per unit and the price of capital is $20 per unit. What will the long-run total cost and long-run average cost of producing 120 units?
February 6, 2011

science
The engines of a 1.20 x 10^5 N rocket exert an upward thrust of 2.00 x 10^5 N for 1.50 minutes upon lift off. What is the impulse exerted on the rocket? What is the velocity of the rocket at the end of the 1.50 minute period?
February 3, 2011

Earth Science
a very fast car hits a stationary(staic) truck.
February 2, 2011

music
Write a 4 bar piano piece in d harmonic minor. Use full cadence.
February 2, 2011

music
Write a 4 bar piece in e harmonic minor. Use and label one diminished triad. Copy the melody into six other clefs.
February 2, 2011

Texas High
The republicans traded the presidency in exchange for railroad monopolies
February 2, 2011

Music
well there was the gregorian chant ...... thats all i noe.. srry
February 2, 2011

FP/101
Some individuals prefer to have their employers withhold more money than they will owe so they can get big refund checks in April or May. Others prefer to minimize withholdings, so they can either spend the money throughout the year, or put it into a retirement or other ...
February 2, 2011

physics
A 5.50 104 kg space probe is traveling at a speed of 11000 m/s through deep space. Retrorockets are fired along the line of motion to reduce the probe's speed. The retrorockets generate a force of 4.00 105 N over a distance of 2600 km. What is the final speed of the probe?
January 26, 2011

math
niran has 72 centimeters of molding to make a frame for a print. this is not enough molding to frame the entire print.How shouldhe cut the molding to give the largest possible area for the print using the inside edge of the molding as the perimeter?
January 26, 2011

physics HELP
A 7450 kg satellite has an elliptical orbit, as in Figure 6.9b. The point on the orbit that is farthest from the earth is called the apogee and is at the far right side of the drawing. The point on the orbit that is closest to the earth is called the perigee and is at the far...
January 26, 2011

physics help!!
it doesn't give me the time...
January 26, 2011

physics help!!
A 5.50 104 kg space probe is traveling at a speed of 11000 m/s through deep space. Retrorockets are fired along the line of motion to reduce the probe's speed. The retrorockets generate a force of 4.00 105 N over a distance of 2600 km. What is the final speed of the probe?
January 26, 2011

physics
at it's peak the speed is zero, and the only acceleration is toward gravity, -9.81m/s^2
January 25, 2011

physics HELP
A 60.0 kg skier rides a 2740 m long lift to the top of a mountain. The lift makes an angle of 14.7¡ã with the horizontal. What is the change in the skier's gravitational potential energy?
January 25, 2011

Algebra 2
reciprocal is number that when times together gets u 1. so 1/-0.01=-100 and 1/2.34=.427...
January 25, 2011

cal
let s(t)= -16t^2 + 50 represent the distance in ft. from the ground of an object t seconds after initial velocity of the object? initial means t=0 1. what is the initial velocity of the object? 2. what is the velocity of the object 1 sec after it was released? 3. when does the...
January 23, 2011

chemistry
Light bulbs emit a broad spectrum of light; that is, they emit photons with a broad range of wavelengths. Suppose that 10% of the photons from a 75-Watt (on watt is one joule per second) bulb are emitted with an average wavelength of 500 nm (middle of the green rage, where our...
January 22, 2011

chemistry
(a) The characteristic emission from Ca occurs at 422.7 nm and corresponds to an electron going from a 4p orbital to a 4s orbital. Calculate the energy of the electron in the 4p orbital. Calculate Zeff for the electron in the 4p orbital. (b) The same 4p to 4s transition in ...
January 22, 2011

chemistry
Hydrogen-like ions are those with only one electron such as He+ and Li2+. The Balmer formula for the transitions in these ions can be written as v=Z^2 cR(1/(n_1^2 )-1/(n_2^2 )). Use this formula to calculate the lowest-energy transition in the Lyman and Balmer series for He+ ...
January 22, 2011

chemistry
Suppose a sample of hydrogen gas is excited to the n=5 level. As the atoms return to the ground state (Balmer series), they emit light. a. How many lines are there in the spectrum? b. Draw an energy-level diagram indicating theses transitions. c. Calculate the three lowest-...
January 22, 2011

chemistry
Calculate the energy (in eV) of the three lowest energy transitions in the Lyman series (the series that ends on n=1) of hydrogen. The wavelengths of these transitions are 121.6 nm, 102.6nm, and 97.3 nm. Draw an energy level diagram of these transitions
January 22, 2011

chemistry
A tube containing hydrogen atoms in the n=3 shell does not absorb visible light. The longest wavelength absorbed is 1875 nm. What state is the hydrogen atom in after absorbing a 1875 nm photon?
January 22, 2011

chemistry
We encounter a large number of waves every day without realizing it. One such source is radio waves. A typical frequency for radio transmission is 680 kHz. How much energy does one mole of radio waves carry? X rays used by doctors to view bones are much more energetic than ...
January 22, 2011

chemistry
Excited lithium atoms emit radiation at 670.8nm. a. calculate the frequency of this radiation. b. calculate the energy (in eV) of this radiation. c. What color is this radiation?
January 22, 2011

chemistry
Excited lithium atoms emit radiation at 670.8nm. a. calculate the frequency of this radiation. b. calculate the energy (in eV) of this radiation. c. What color is this radiation?
January 22, 2011

College algebra
simplify by removing factors of 1 n^2-9/(n+3)^2
January 21, 2011

chemistry
Copper reacts with sulfuric acid according to the following equation: 2H3SO4 + Cu-> CuSO4 + 2H2O + SO2 How many grams of sulfur dioxide are created by this reaction if 14.2 g of copper reacts with 18 g of sulfuric acid?
January 20, 2011

chemistry
Ammonia gas can be prepared by the reaction CaO(s) + 2NH4Cl(s) -> 2NH3(g) + H2O(g) + CaCl2(s) If 112 g CaO reacts with 224 g NH4Cl, how many moles of reactants and products are there when the reaction is complete?
January 20, 2011

chemistry
Copper reacts with sulfuric acid according to the following equation: 2H3SO4 + Cu-> CuSO4 + 2H2O + SO2 How many grams of sulfur dioxide are created by this reaction if 14.2 g of copper reacts with 18 g of sulfuric acid?
January 20, 2011

chemistry
Ammonia gas can be prepared by the reaction CaO(s) + 2NH4Cl(s) -> 2NH3(g) + H2O(g) + CaCl2(s) If 112 g CaO reacts with 224 g NH4Cl, how many moles of reactants and products are there when the reaction is complete?
January 20, 2011

chemistry
determine the value of x for the following reaction: 4C + S8-> 4CS2 3.2 mol S8 yield x mol CS2
January 20, 2011

chemistry
How many moles of oxygen can be obtained by the decomposition of 7.5 mol of reactant in the following reaction? 2KClO3 -> 2KCl + 3O2
January 19, 2011

math
y=2x-5 shifted down one
January 19, 2011

math
how do you change a linear equation to make the graph steeper?
January 19, 2011

chemistry
How many moles of gas does it take to occupy 120 L at a pressure of 233 kPa and a temperature of 340 K?
January 18, 2011

chemistry
The solubility of NaCl in water is 35.7 g NaCl/100 g H2O. Suppose that you have 500.0 g of NaCl. What is the minimum volume of water you would need to dissolve it all? The density of water is 1.0 g/mL.
January 17, 2011

chemistry
An explosive whose chemical formula is C3H6N6O6 produces water, carbon dioxide, and nitrogen gas when detonated in oxygen. write the chemical equation for the detonation reaction of this explosive.
January 17, 2011

chemistry
which is the symbol for the following monatomic ion? 8 protons and 10 electrons
January 17, 2011

chemistry
On average, earth's crust contains about 8.1% aluminum by mass. If a standard 12-ounce soft drink can contains approximately 15.0g of aluminum, how many cans could be made from one ton of the Earth's crust?
January 17, 2011

chemistry
Titanium is used in airplane bodies because it is strong and light. It has a density of 4.55 g/cm^3. If a cylinder of titanium is 7.75 cm long and has a mass of 153.2 g, calculate the diameter of the cylinder. (V=pi*r^2*h, where V is the volume of the cylinder, r is the radius...
January 17, 2011

chemistry
Mercury has a density of 13.6 g/mL. What is the mass of 4.72 L of mercury?
January 17, 2011

chemistry
Mercury has a density of 13.6 g/mL. What is the mass of 4.72 L of mercury?
January 17, 2011

chemistry
Mercury has a density of 13.6 g/mL. What is the mas of 4.72 L of mercury?
January 17, 2011

chemistry
A sample of crude oil has a density of 0.87g/mL. What volume in liters does a 3.6-kg sample of this oil occupy?
January 17, 2011

chemistry
No! It Al(OH) with the subindex of 2 ==> Al to the power+ plus OH with a negative sign on the top!
January 15, 2011

chemistry
balance the chemical equation: Al(OH)2-- Al^2+ +OH^-
January 15, 2011

chemistry
show that 1mg/L = 1g/m3
January 15, 2011

chemistry
you made up a standard solution of calcium sulfate (CaSO4). the temperature is 25C. you then add 5.00*10^-3 odium sulfate (Na2SO4). Calculate the concentrations of calcium and sulfate after equilibrium is reached? The pKs of CaSO4 is 4.58.
January 15, 2011

chemistry
The concentration of a chemical degrades in water according to order kinetics. the degradation constant is 0.2 day^-1. if the initial concentration is 100.0 mg/L, how many days are required for the concentration to reach 0.14 mg/L?
January 15, 2011

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