# Posts by Maria

Total # Posts: 2,063

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

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.

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 .

Biological psychology
What does mitosis produce and how?

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.

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

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

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.

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 .

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?

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.

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.

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.

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

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

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

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?

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.

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

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?

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

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

Earth Science
need to find the mystery phrase made from the following letters DNALFOSSERGORPEGA

biochemistry
the answer is 50 g w/v = 50g/500 ml = 10%

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

biochemistry
17g/375ml = 0.453% (w/v)

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

math
74

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.

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.

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.

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 ...

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...

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 ...

Shurley English
warm hot cold

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?

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?

Earth Science
a very fast car hits a stationary(staic) truck.

music
Write a 4 bar piano piece in d harmonic minor. Use full cadence.

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

Texas High
The republicans traded the presidency in exchange for railroad monopolies

Music
well there was the gregorian chant ...... that's all i noe.. srry

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 ...

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?

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?

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...

physics help!!
it doesn't give me the time...

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?

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

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?

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

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...

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...

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 ...

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+ ...

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-...

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

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?

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 ...

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?

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?

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

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?

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?

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?

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?

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

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

math
y=2x-5 shifted down one

math
how do you change a linear equation to make the graph steeper?

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?

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.

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.

chemistry
which is the symbol for the following monatomic ion? 8 protons and 10 electrons

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?

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...

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

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

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

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?

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

chemistry
balance the chemical equation: Al(OH)2-- Al^2+ +OH^-

chemistry
show that 1mg/L = 1g/m3

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.

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?

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 may days are required for the concentration to reach 0.14 mg/L?

chemistry
if 200mg of HCl is added to water to achieve a final volume of 1.00 L, what is the final pH?

chemistry
a) 45.00g/L(1000mg/g)(1L/1000mL)=45mg/mL b)NaHCO3: 22.99+1+12+3(16)= 83.99g/mol prop. of Na (22.99/83.99)=0.54 c)? d)?

chemistry
A solution of sodium bicarbonate is prepared by adding 45.00g of sodium bicarbonate to a 1.00-L volumetric flask and adding distilled water until it reaches the 1.00-L mark. Calculate the concentration of sodium in units of: a) milligrams per liter b) molarity c) normality d) ...

Chemistry
A solution is made by dissolving 10.20 grams of glucose (C6H12O6) in 355 grams of water. What is the freezing-point depression of the solvent if the freezing point constant is -1.86 °C/m?

engineering
If faucet is dripping at a rate of one drop per second and each drop contains 0.150 milliliters. Calculate how much water will be lost in 1 year.

World History
How was the grenade developed to help the war effort?

PHI.: 103
what fallacy is this? I don't know what colleges are teaching these days! I have just received a letter of application from a young man who graduated from the state university last June. It was a wretched letter – badly written, with elementary errors in spelling, ...

9th grade algebra
input/output numbers. i need the relation. x-1 2 3 4 5 y-0 5 28 81 176

statistics
from a group of six people two individuals are to be selected at random. How many possible selections are there?

Statistics
About how many participants are needed for 80% power in each of the following planned studies that will use a t test for dependent means with p < .05? Predicted Effect Size Tails (a) Medium Two (b) Large One (c) Small One

Statistics
About how many participants are needed for 80% power in each of the following planned studies that will use a t test for dependent means with p < .05? Predicted Effect Size Tails (a) Medium Two (b) Large One (c) Small One

Math
if a triangle has a perimeter of 50cm one side is double the length of the base and the second side is four less than three times the base how long is the base?

Algrebra
3u-ux/x=6y/x

Math (algebra)
(y-1)/2u+x=m what does "u" equal?