# Posts by Maria

Total # Posts: 2,025

**Spanish**

1. les gusta 2.le gusta 3.le gusta 4.me gusta 5.nos gusta 6.te gusta

**Spanish**

1. me gusta 2.le gusta 3.nos gusta 4.le gustan 5.te gusta

**cómo comenzar a aprender inglÃ©s?**

Necesito aprender inglés y no sé por donde comenzr, por favor, ayuda.

**Chemistry**

The second part of this question does not make sense cell potential has to be in V not M...M is for concentration

**trig**

115.4

**algebra**

6x + 2y = -2 4x + y = 1

**chemistry-URGENT**

Hydrazine is used as a rocket fuel. When 1.50 g of hydrazine, N2H4, was burned in a bomb calorimeter, temperature increased from 23.57 °C to 28.84 °C. The heat capacity of the calorimeter was 5.510 kJ/°C. Determine the enthalpy of combustion of octane.

**chemistry**

Determine the heat of combustion of acetylene (C2H2).

**Chem**

The total pressure in an 11.1L automobile tire is 40psi at 13 degree celcius. By how much does the pressure in the tire rise if it warms to a temperature of 56 degrees celcius and the volume remains at 11.1L ?

**Spanish**

the first one is B. The second one is D the third one is C

**physics**

In the parallel circuit, if the current put out by the battery is 3 A and the current through R1 is 1 A, what is the current through R2?

**physics**

thanks,(:

**physics**

A 70 ohm resistor is connected to a 6.7 V battery in the circuit below.When the switch is closed, calculate the current I. Answer in units of A.

**chemistry**

write a balanced chemicl equation for the reversible reaction of carbon monoxide and chlorine gases to form carbonyl choride gas, COCl2.

**math**

solve for 5x+3y=2 and 6x+4y=7

**MATH**

A light year is the distance that a light travels through a vacuum (space without matter) in one year. A light year is about 9.46 x 10^12km. The distance to the spiral galaxy NGC 4603 is about 1.08 x 10^8 light years. What is the distance in km?

**science**

ok thanks!

**science**

please be specific. does it increase or decrease molarity of NaOH? or does the molarity stay the same???

**science**

a burette had 10ml of water in it before it was filled with NaOH. would this increase, decrease, or not affect the molarity of NaOH in the burette? Explain!

**Government**

true but what would be different about the legal sysyem itself?

**Government**

If a person had to prove his or her innocence instead of the government how would our legal system differ?

**physics**

A 18.7 ohm and a 24.3 ohm resistor are connected parallel. A difference in potential of 41.5 V is applied to the combination. What is the equivalent resistance of the parallel circuit? Answer in units of ohm .

**physics**

The load across a 12 V battery consists of a series combination of three resistors 21 ohm, 22 ohm, and 56 ohm. What is the total resistance of the load? Answer in units of .

**math**

In 1000 samples, assuming that the null hypothesis is true, how many times would you expect to commit Type I error if alpha=.05?

**Math**

Find x, the angle of depression (measured in degrees) from the top of a lighthouse that is 173 ft above water level to the waterline of a ship 4835 ft off shore. Round your answer to the nearest hundredth of a degree.

**physics**

The load across a 12 V battery consists of a series combination of three resistors 21 ohm, 22 ohm, and 56 ohm. What is the total resistance of the load?

**Physics**

A spring has a spring constant, k, of 441 N/m. How much must this spring be stretched to store 22 J of potential energy?

**science**

what does an experiment prove /or disprove?

**math**

find g(1)+g(2)+g(3)+...+g(50) given that g(x)=13-5x

**Calculus please help**

y=100 find the first and second derivative

**math**

Two cards are chosen from a standard deck of 52 playing cards without replacement. What is the probability both cards will be an Ace

**physics**

A bullet is fired straight up from a gun with a muzzle velocity of 170 m/s. Neglecting air resistance, what will be its displacement after 5.8 s? The acceleration of gravity is 9.8 m/s2 . Answer in units of m.

**physics**

A potential difference of 12 V produces a current of 0.90 A in a piece of copper wire. What is the resistance of the wire?

**physics**

A bullet is fired straight up from a gun with a muzzle velocity of 170 m/s. Neglecting air resistance, what will be its displacement after 5.8 s? The acceleration of gravity is 9.8 m/s2 . Answer in units of m.

**Algebra I**

7x-y+5

**physics**

A potential difference of 12 V produces a current of 0.90 A in a piece of copper wire. What is the resistance of the wire?

**physics**

A driver of a car traveling at 15.9 m/s applies the brakes, causing a uniform deceleration of 1.7 m/s2. How long does it take the car to accelerate to a final speed of 13.0 m/s? Answer in units of s. b) How far has the car moved during the braking period? Answer in units of m.

**physics**

A dog sits 3.0 m from the center of a merry- go-round. a) If the dog undergoes a 1.2 m/s2 cen- tripetal acceleration, what is the dog’s linear speed? Answer in units of m/s. b)What is the angular speed of the merry-go- round? Answer in units of rad/s.

**physics**

A staging that weighs Wstaging supports a painter weighing 560 N. The reading on the left scale is 610 N and the reading on the right scale is 460 N. What is the weight of the staging? Answer in units of N.

**physics**

A harmonic wave is traveling along a rope. The oscillator that generates the wave com- pletes 44.0 vibrations in 26.9 s. A given crest of the wave travels 359 cm along the rope in a time period of 11.6 s. What is the wavelength? Answer in units of m.

**physics**

A negatively charged balloon has 4.6 μC of charge. How many excess electrons are on this bal- loon? Answer in units of electrons.

**Chemistry**

well they are supposed to be used for an NaOH titration. but if that doesnt help, than in general why should they be dissolved?

**Chemistry**

Why should the sodium hydroxide pellets be completely dissolved in the preparation of the NaOH solution? please explain thouroughly, thanksss in advance!!

**physics**

Two electrostatic point charges of +50.0 μC and +50.0 μC exert a repulsive force on each other of 197 N. What is the distance between the two charges? The Coulomb constant is 8.98755 × 109 N · m2/C2. Answer in units of m.

**physics**

A certain car is capable of accelerating at a uniform rate of 0.82 m/s2. What is the magnitude of the car’s displace- ment as it accelerates uniformly from a speed of 85 km/h to one of 95 km/h? Answer in units of m.

**chemistry ASAP please!!**

The reaction of CO(g) + NO(g) is second-order in NO2 and zero-order in CO at temperatures less than 500K. (a) Write the rate law for the reaction. (b) How will the reaction rate change if the NO2 concentration is halved? (c) How will the reaction rate change is the ...

**Chemistry**

Ten kilograms of hydrogen gas are mixed with 355 kg of chlorine in a 0.50 mm^3 drum. The two gases react to produce hydrogen chloride. What is the final pressure in the drum if the final temperature is 60 degrees celcius?

**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.

**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.

**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.

**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.

**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.

**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.

**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.

**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.

**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.

**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.

**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.

**Java/programming**

write a program that determines the number of days in a given semester.

**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..

**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..

**psychology**

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

**geometry**

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

**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 ...

**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 ...

**math**

how do i rename mixed nimber in simplest form.15/8

**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 ...