# Posts by Maria

Total # Posts: 1,990

**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 ...

**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