Saturday
October 25, 2014

Posts by Maria


Total # Posts: 1,527

Physics
A man jogs along at 1.2 m/s. His dog, playing 36 m behind him, waits for 5 s, then takes off after him at 3.1 m/s. How far apart are they when the dog starts after his master? Answer in units of m. How far will the dog run? Answer in units of m.
May 13, 2011

Spanish
1.bebes 2.hago 3.tiene 4.envia compartir
May 11, 2011

poetry
what is the meter in the poem "Me"by Walter de la Mare?
May 11, 2011

MATH
A rope 105 meters long must be cut into pieces that are 2 1/2 meters long. How many pieces of rope are there
May 9, 2011

Earth science
Which single factor generally has the greates effect on the climate of an area on the earth's surface?
May 9, 2011

Physic
A flywheel rotates with an angular speed of 26 rev/s. As it is brought to rest with a constant acceleration, it turns 55 rev. What is the magnitude of the angular acceleration? How much time does it take to stop?
May 8, 2011

Physic
A 3.8 kg object is supported by an aluminum wire of length 1.9 m and diameter 2.2 mm. How much will the wire stretch?
May 8, 2011

Physics
A 669 g sample of water at 83 degrees celsius is mixed with 486 g of water at 23 degrees celsius. What is the final temperature of the mixture? Assume no heat loss to the surroundings.
May 8, 2011

science
What is the relationship between DNA, chromosomes, alleles and genes?
May 5, 2011

Science (Force and motion)
Explain how acceleration can be slowing down. Calculate the impact force of a 50 kg object travelling at 100km/hr. (Momentum = mass x velocity) Calculate the momentum of a tennis ball of 50 g moving at a velocity of 25m/s.
May 3, 2011

WORD PROBLEMS WITH EQUATIONS
Mark has 28 10-cent and 20-cent pieces. How many of each coin does he have if their total value is $4.30? In a class of 26 students, there are four more than girls. How many boys are there?
May 1, 2011

Physics
I got the answer wrong. Is there any other ways you can explain this?
April 28, 2011

Physics
A 37 ohm lamp and a 59 ohm lamp are connected in series and placed across a potential of 43 V. What is the equivalent resistance of the circuit? Answer in units of ohm. What is the current in the circuit? Answer in units of A. What is the voltage drop across the first lamp? ...
April 28, 2011

PHysics
A dragster maintains a speedometer reading of 100 km/h and passes through a curve with a constant radius. Which statement is true? 1. The dragster rounded the curve at a changing velocity of 100 km/h. 2. The dragster moved along a straight line at a constant velocity of 100 km...
April 28, 2011

blair
Sitting motionless on a playground swing. The downward force is 500 n. How much force is there on each of the two swing chainsv
April 27, 2011

Business
How about these ones? This modifiers are really confusing. Do you know of any website that will make them easy to understand? 1)Rudolph enjoys eating curries from the Indian delicatessen with a lot of spices. 2) On the phone, the telemarketer persuaded the new homeowners to ...
April 27, 2011

Business
Identify which of the following sentences uses modifiers correctly; a) kurt and his hockey teammates nearly cooked two hundred pancakes for the breakfast fundraising event. d) Bridget decided to leave her career as an attorney and pursue acting during the meditation retreat.
April 27, 2011

physics
1.using equations What would happen if the knob were placed in the center of the door? What would happen if the knob were placed right next to the hinges?
April 26, 2011

physics
1.What if Newton’s Third Law did not exist?. In your response to this inquiry, think of some of the consequences if Newton’s Third Law were not true. Describe in detail at least two consequences that would result if the Third Law were not true.
April 26, 2011

math
How many pieces of ribbon 1 4/5 yd long can be cut a length of ribbon 9 yd long?
April 25, 2011

statistics
At a neighboring university, the average salary is also $45,000 and the distribution is normal. If $47,000 has a z score of 1.5, what is the standard deviation?
April 24, 2011

statistics
calculate the 95% confidence interval for u given X=100, s=25, and N=101
April 24, 2011

research methods
a bag of 100 marbles contains 0 blue, 25 green, 25 mixed,and 20 clear. what is the probality of selecting a blue? ablue and green? a marble that is not clear? ablue on the first draw and a clearon the second draw?
April 24, 2011

physics
A proton moves perpendicularly to a mag- netic field that has a magnitude of 3.09×10^−2 T. The charge on a proton is 1.60×10−19 C. What is the speed of the particle if the magnitude of the magnetic force on it is 3.50*10^−14N? Answer in units of m/s.
April 19, 2011

physics
A thin 2.82 m long copper rod in a uniform magnetic field has a mass of 44.2 g. When the rod carries a current of 0.238 A, it floats in the magnetic field. The acceleration of gravity is 9.81 m/s2 . What is the field strength of the magnetic field? Answer in units of T.
April 19, 2011

physics
A proton moves perpendicularly to a mag- netic field that has a magnitude of 3.09×10^−2 T. The charge on a proton is 1.60×10−19 C. What is the speed of the particle if the magnitude of the magnetic force on it is 3.50*10^−14N? Answer in units of m/s.
April 19, 2011

Spanish
1. les gusta 2.le gusta 3.le gusta 4.me gusta 5.nos gusta 6.te gusta
April 18, 2011

Spanish
1. me gusta 2.le gusta 3.nos gusta 4.le gustan 5.te gusta
April 18, 2011

cˇmo comenzar a aprender ingl├ęs?
Necesito aprender inglés y no sé por donde comenzr, por favor, ayuda.
April 18, 2011

Chemistry
The second part of this question does not make sense cell potential has to be in V not M...M is for concentration
April 17, 2011

trig
115.4
April 16, 2011

algebra
6x + 2y = -2 4x + y = 1
April 13, 2011

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.
April 10, 2011

chemistry
Determine the heat of combustion of acetylene (C2H2).
April 10, 2011

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 ?
April 10, 2011

Spanish
the first one is B. The second one is D the third one is C
April 9, 2011

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?
April 8, 2011

physics
thanks,(:
April 8, 2011

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.
April 8, 2011

chemistry
write a balanced chemicl equation for the reversible reaction of carbon monoxide and chlorine gases to form carbonyl choride gas, COCl2.
April 7, 2011

math
solve for 5x+3y=2 and 6x+4y=7
April 3, 2011

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?
March 31, 2011

science
ok thanks!
March 31, 2011

science
please be specific. does it increase or decrease molarity of NaOH? or does the molarity stay the same???
March 31, 2011

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!
March 31, 2011

Government
true but what would be different about the legal sysyem itself?
March 29, 2011

Government
If a person had to prove his or her innocence instead of the government how would our legal system differ?
March 29, 2011

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 .
March 29, 2011

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 .
March 29, 2011

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?
March 28, 2011

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.
March 28, 2011

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?
March 28, 2011

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?
March 28, 2011

science
what does an experiment prove /or disprove?
March 26, 2011

math
find g(1)+g(2)+g(3)+...+g(50) given that g(x)=13-5x
March 25, 2011

Calculus please help
y=100 find the first and second derivative
March 25, 2011

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
March 24, 2011

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.
March 22, 2011

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?
March 22, 2011

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.
March 22, 2011

Algebra I
7x-y+5
March 21, 2011

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?
March 20, 2011

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.
March 20, 2011

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.
March 20, 2011

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.
March 20, 2011

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.
March 20, 2011

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.
March 20, 2011

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?
March 18, 2011

Chemistry
Why should the sodium hydroxide pellets be completely dissolved in the preparation of the NaOH solution? please explain thouroughly, thanksss in advance!!
March 18, 2011

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.
March 16, 2011

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.
March 15, 2011

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 ...
March 15, 2011

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?
March 13, 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

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

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

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