# Martin

Most popular questions and responses by Martin-
## Chemistry

How many mole of H2 will be produced if 0.500 grams of magnesium is reacted with 10.00mL of 2.0 M HCl? I've concluded the answer is 0.02 moles of H2, but I'm doubting myself a lot because I don't understand the aspects of the balanced chemical equation and

*asked on October 22, 2011* -
## Physics

a) A 40 cm radius wheel is rotating at 20rad/sec. How fast is this wheel moving across the ground? b) How far (in meters) will this wheel move in 6 seconds?

*asked on May 21, 2017* -
## Physics

a) Find the angular velocity of a 40 cm radius wheel that is moving at 20 m/s. b) How many times will this wheel rotate in 5 seconds?

*asked on May 21, 2017* -
## Physics

A race car starts from rest in the pit area and accelerates at a uniform rate to a speed of 35 m/s in 11s, moving on a circular track of radius 500 m. Determine the tangential and centripetal components of the net force excreted on the car(by the ground)

*asked on May 19, 2013* -
## Chem

given the balanced equation: 2Al2O3(s)-->4Al(s)+302(g) What is the total number of moles of O2 that are produced when 8.0 mol of Al2O3(s)are totally decomposed ? please help me.

*asked on January 3, 2011* -
## Physics

a) Find the angular velocity of a wheel that rotates 6 times every 4 seconds. b) What is the tangential velocity of the outside of the wheel if the radius is 15 cm?

*asked on May 21, 2017* -
## Algebra

The ratio of the areas of two squares is 32/63. After rationalizing the denominator, the ratio of their side lengths can be expressed in the simplified form (a*sqrt b)/c where a, b, and c are integers. What is the value of the sum a + b + c?

*asked on July 23, 2016* -
## chemistry

URGENT!! You wish to prepare 1 L of a 0.02 M potassium iodate solution. You require that the final concentration be within 1% of 0.02 M and that the concentration must be known accurately to the fourth decimal place. How would you prepare this solution?

*asked on October 11, 2010* -
## CHEM

How can I calculate a pH of hypochlorite buffer into LiCLO with only initial concentrations and no Ka value? [CLO-]=.1M [LiCLO]=.1M

*asked on April 13, 2013* -
## Calculus

A leaky cylindrical oilcan has a diameter of 4 inches and a height of 6 inches. The can is full of oil and is leaking at the rate of 2 cubic inches/hr. The oil leaks into an empty conical cup with a diameter of 8 inches and a height of 8 inches. a. At what

*asked on February 23, 2008* -
## History :)

Can someone help with this one please? Select one reform movement from the Progressive Era. Describe the movement and its impact on South Carolina. Provide details and examples that support how this movement changed South Carolina. Websites and examples

*asked on April 3, 2015* -
## Chem

Solid urea, (NH2)2CO, burns to give CO2,N2, and liquid H2O. Its heat of combustion is -632.2 kJ/mol. Balance the equation for combustion of urea, and calculate the heat generated per mole of H2O formed. (Enter in kJ.)

*asked on October 23, 2014* -
## History

Which is the best definition of naturalization? The process of living and working in the U.S. in order to become a citizen The act of taking an oath of loyalty to the U.S. in order to become a citizen The legal steps taken for a citizen born in another

*asked on April 12, 2018* -
## MATH

Use a table of trigonometric values to find the angle è in the right triangle in the following problem. Round to the nearest degree, if necessary. cos è=? A=22 H=38

*asked on July 17, 2012* -
## Calculus

A balloon rises vertically at a rate of 8 feet/sec. A bird flies 40 feet above ground toward the balloon’s path at 20 feet per second. At what rate is the distance between the bird and the balloon changing when the bird is 50 feet from the balloon

*asked on October 31, 2017* -
## Science

A snooker ball X of mass 0.3kg moving at 5m/!@#$%^& a stationary ball Y of mass 0.4kg and Y move at a velocity of 2m/s at angle to the initial direction of X. Find the velocity and direction of X after hitting

*asked on September 2, 2016* -
## Physcial Science

Alpha particle tracks through gases and thin metal foils show few deflections. What does this tell us about the atom?

*asked on October 2, 2011* -
## english

2. Tecumseh's "Let the white race perish" speech is A. a logical list of reasons why the whites should be resisted. B. a satire on the white race and its traditions. C. a plea to the people's reason. D. an appeal to the emotions of his listeners.

*asked on September 18, 2013* -
## chemistry

Hvap 40.65 kJ/mol Hf -285.83 kJ/mol Hfusion 6.03 kJ/mol specific heat 4.186 J/gC molar mass 18.02 g How much energy is consumed by thawing 4.3 g ice?

*asked on June 28, 2012* -
## Physics 1

(I) determine the tangential and centripetal components of the net force excreted on the car(by the ground) when it accelerates at a uniform speed of 15 m/s in 11 s, moving on a circular track of radius 500m. The cars mass is 1100kg.

*asked on May 18, 2013* -
## Physics

A student applies an upward force of 58 N to a 5.1-kg physics textbook. Find the book’s acceleration (positive for up, negative for down).

*asked on February 25, 2011* -
## Physics

A body vibrates in simple harmonic motion with an amplitude of 5 cm and a frequency of 0.50 Hz. a) Calculate: i) the maximum acceleration ii) the maximum velocity iii) the magnitude of the acceleration and velocity when the body is displaced 10 mm from its

*asked on June 4, 2017* -
## Basic Statistics

In each of the following situations state whether or not the given assignment of probabilities to individual outcomes is legitimate, that is, satisfies the rules of probability. If not, give a reason a) roll a die and record the count of spots on the

*asked on March 2, 2012* -
## Physics

The piston in a particular car engine moves in approximately simple harmonic motion with an amplitude of 8 cm. The mass of the piston is 8 kg and the piston makes 100 oscillations per second. Calculate: a) the maximum value if the acceleration of the

*asked on June 4, 2017* -
## physics 30

A flash of lightning transfers 1.5 x 10^9 Joules of energy through a potential difference of 5.0 x 10^7 Volts between a cloud and the ground. Calculate the quantity of charge transferred in the lightning bolt. How many electrons were transferred? Does this

*asked on May 19, 2012* -
## comper science

write a program that accept the name of a student score obtained in 5 courses and compute the average score of the student.your program must display the name of that student on tab 5

*asked on May 12, 2011* -
## pre-algebra

your family is driving to houston,texas.A sign indicates that you are 700 miles from houston.Your car's trip odometer indicates you are 400 miles from home.YOu are traveling at an average speed of 60 miles per hour. A. write an expression for the

*asked on December 9, 2008* -
## biology

Suppose you have monohybrid snapdragons in your garden and you find that they produce red seeds to white seeds in the ratio of 3:1. If the alleles are designated R (red seeds) and r (white seeds), what are the probable phenotypes of the parents (P1)? a all

*asked on January 25, 2011* -
## math

your family is driving to houston,texas.A sign indicates that you are 700 miles from houston.Your car's trip odometer indicates you are 400 miles from home.YOu are traveling at an average speed of 60 miles per hour. A. write an expression for the

*asked on December 9, 2008* -
## Physics 1

(I) determine the tangential and centripetal components of the net force excreted on the car(by the ground) when it accelerates at a uniform speed of 15 m/s in 11 s, moving on a circular track of radius 500m. The cars mass is 1100kg.

*asked on May 18, 2013* -
## math

solve the system 7x^2 - 5y^2 + 20y = 3 21x^2 + 5y^2 =209

*asked on March 10, 2012* -
## science

A step-up transformer has 120 turns on its primary coil. It has 1150 turns on its secondary coil. The primary circuit is supplied with an alternating current at 120 V. The current in the secondary circuit is 2.4 A. What current is in the primary circuit?

*asked on April 3, 2008* -
## History

Which set of issues led to the Civil War? Economics, religion, boundaries Politics, education, voting rights ** Slavery, politics, economics Voting rights, slavery, politics

*asked on April 12, 2018* -
## physics

Consider a system of N identical particles. Each particle has two energy levels: a ground state with energy 0, and an upper level with energy . The upper level is four-fold degenerate (i.e., there are four excited states with the same energy ). (a) Write

*asked on March 11, 2012* -
## Chemistry

Consider the voltaic cell: Zn(s) / Zn2+(aq) // H+(aq) / H2(g) / Pt(s) Calculate the value of Ecell, in V, when [Zn2+] =1.00 M and [H+] = 0.00100 M DATA: Zn2+(aq) +2 e¯ ---> Zn(s);Eo = - 0.76 V 2 H+(aq) + 2 e¯ ---> H2(g);Eo = 0.00 V

*asked on June 19, 2011* -
## math word problem

Case Eastern Junior College awarded 26 varsity letters in crew, 15 in swimming, and 16 in scoccer. If awards went to 46 students and only 2 lettered in all sports, how many students lettered in two of the three sports?

*asked on August 8, 2009* -
## statistics

4. The Graduate Record Exam (GRE) has a combined verbal and quantitative mean of 1000 and a standard deviation of 200. Scores range from 200 to 1600 and are approximately normally distributed. For each of the following problems: (a) draw a rough sketch,

*asked on August 14, 2015* -
## AP Chemistry

If 15.0mL of 2.50M NaCl is mixed with 60.0mL of 0.300M Pb(NO3)2, what is the mass of the precipitate

*asked on October 4, 2012* -
## Physics 30

A test charge of 5.0x10^-6 C is moved 2.0 cm through an electric force of 6.0 x 10^-7 N . What is the change in evergy of the test charge? What is the change in voltage on the charge? Help

*asked on May 19, 2012* -
## economics

suppose the marginal propensity to consume is 0,6 and investment spending increases by 20 billion. by how much will total production or income change?

*asked on April 22, 2019* -
## modern physics

a hunter on the ground fires a bullet in the northeast direction which strikes a deer 0.25 metre away from him, the bullet travel with a speed of 1800m/hr.at the instant an airplane is directly over the hunter at an altitude of one metre and is traveling

*asked on March 1, 2015* -
## Political Science

In Marbury v. Madison, the Supreme Court established the principle of constitutional review by? I am seconding guessing myself on my answer so can you point me the right direction is it: claiming that Section 13 of the 1789 Judiciary Act providing that the

*asked on February 1, 2015* -
## calculus 1

find the total area between the curve ( y= 4-x to the second power) and the x-axis over the interval [-3,7]

*asked on November 19, 2010* -
## Chemistry

Calculate the rate at which N2O4 is formed in the following reaction at the moment in time when NO2 is being consumed at a rate of 0.0521 M/s. 2NO2(g) N2O4 (g) I am not really sure how to go about this problem. rate = k (N2O4) d(NO2)/dt = -2 d(N2O4)/dt

*asked on May 19, 2009* -
## Biology

Hi there, Describe the role of bacteria in biotechnology and genetic engineering. I'd appreciate the help. Thanks. Since this is not my area of expertise, I searched Google under the key words "bacteria biotechnology" to get these possible sources:

*asked on March 19, 2007* -
## Maths

A father was three times as old as his son fifteen years ago and four times his sons age nineteen years ago. When was the father twice as old as the son?

*asked on April 30, 2017* -
## algebra A055,

World Records in the 1500-m Run. The formula R = -0.075t + 3.85 can be used to predict the world record in the 1500-m run t years after 1930. Determine (in terms of an inequality) those years for which the world record will be less than 3.5 min. { Y l Y >

*asked on June 2, 2015* -
## algebra

World Records in the 1500-m Run. The formula R = -0.075t + 3.85 can be used to predict the world record in the 1500-m run t years after 1930. Determine (in terms of an inequality) those years for which the world record will be less than 3.5 min.

*asked on June 2, 2015* -
## physics

A 2.40 kg firecracker explodes into two pieces and produces 170 J of heat, light, and sound energy. One of the pieces has a mass of 0.800 kg and a speed of 4.50 m/s after the explosion. If the mass of the other piece is 1.20 kg, what is its speed after the

*asked on June 20, 2014* -
## math

If you borrow $15,000 from your dad for college and you agree to pay him $25,000 back at 8% compound interest per year. How many years do you think you have to do this? In other words, given the amounts and the interest rate, what is the number of years?

*asked on October 9, 2012* -
## Math

A scale drawing of an office building is not labeled but indicates 1 / 3 inch = 4 feet. On the drawing one wall measures 4 and 2 / 3 inches. How long is the wall?

*asked on September 15, 2011* -
## Chemistry

A reaction proceeds according to the following mechanism: Cl2 ⇌ 2 Cl (fast equilibrium) Cl + H2 ⇌ H2Cl (fast equilibrium) H2Cl + Cl → 2 HCl (slow) What is the rate law for this reaction?

*asked on June 25, 2011* -
## calculus 1

find the total area between the curves ( y= 4-x ^2 ) and the x-axis over the intervals [0,4]

*asked on November 19, 2010* -
## algebra A055,

World Records in the 1500-m Run. The formula R = -0.075t + 3.85 can be used to predict the world record in the 1500-m run t years after 1930. Determine (in terms of an inequality) those years for which the world record will be less than 3.5 min. { Y l Y >

*asked on June 2, 2015* -
## Political Science

In Gibbons v. Ogden, the Supreme Court held that? In Chapter 7 Federal Authority and the Limits to State Authority. If I am understanding right that the 10th Amendment trumps the Interstate Commerce Clause. I am I right?

*asked on February 1, 2015* -
## chemistry

Hvap 40.65 kJ/mol Hf -285.83 kJ/mol Hfusion 6.03 kJ/mol specific heat 4.186 J/gC molar mass 18.02 g How much energy is consumed by thawing 4.3 g ice?

*asked on June 28, 2012* -
## Chemistry

A rock contains 200. µmol 238U (t1/2 = 4.5 109 yr) and 116 µmol 206Pb. Assuming that all the 206Pb comes from decay of the 238U, estimate the rock's age. Please explain step by step.

*asked on December 7, 2011* -
## Discrete Math

You have two decks of 26 cards. Each card in each of the two decks has a different letter of the alphabet on it. You pick at random one card from each of the two decks. A vowel is worth 3 points and a consonant is worth 0 points. Let X = the sum of the

*asked on November 15, 2011* -
## physics

1.A proton enters a 2.0 X 10^-2 T magnetic field with a speed of 5.8 X 10^4 m/s. What is the radius of the circular path it follows? formula?? 2.Electrons moving at 3.5 X 10^4 m/s pass through an electric field with an intensity of 5.6 X 10^3 N/C. How

*asked on April 9, 2008* -
## Physics

A driver jumps off the 3.0m diving board with an initial velocity of 5.0m/s. (a) Determine the maximum height, (b) The time to reach the maximum height, (c) The time it took to touch the water, and (c) The speed when touching the water.

*asked on February 28, 2017* -
## Political Science

In Gibbons v. Ogden, the Supreme Court held that?

*asked on February 1, 2015* -
## phsics

a man weighs 1370N on earth what would he weigh on jupiter where free fall acceleration is 25.9 m/s2 the acceleration of gravity is 9.8 m/s2 in units of N

*asked on November 2, 2014* -
## COMM100

Which of the following would be an appropriate way to use the DECIDE tool in response to research suggesting that there are differences between the way men and women communicate?

*asked on September 6, 2013* -
## physics

Given that the mass of an electron is 9.1 x 10^-28 grams and the charge on an electron is 1.6 x 10^-19 Coulombs, calculate the voltage required to lift an electron 5 cm. not quite sure how to do this.

*asked on May 19, 2012* -
## arithmetic

The nth term of the sequence 4,11,18,...is167 find n

*asked on January 21, 2012* -
## phycis

A roller coaster has two hills and starts from rest atop the first hill , which is the higher of the two hills . The secound hill increases if the height of the initial hill is increased by 20m

*asked on December 28, 2011* -
## Math

Suppose R is the relation on N where aRb means that a ends in the same digit in which b ends. Determine whether R is an equivalence relation on N. And, Suppose that R and S are equivalence relations on a set A. Prove that the R ¿ S is also an

*asked on November 18, 2011* -
## physics

A ball moving with a speed of 26 m/s strikes an identical ball that is initially at rest. After the collision, the incoming ball has been deviated by angle 1 = 50° from its original direction, and the struck ball moves off at angle 2 = 29° from the

*asked on March 9, 2011* -
## Math

Write an integer that is represented by the bold words in the following sentence. The temperature dropped 17 degrees between noon and midnight.

*asked on March 13, 2014* -
## Discrete Math

How many ways can you get a bunch of 4 books to give a friend if you have 30 books (15 novels, 10 history book and 5 math books)?

*asked on November 1, 2011* -
## chemistry

NaOH + CH3COOH = CH3COONa + H2O calculate the mass concentration in gdm-3 of the orinigal viniger

*asked on October 27, 2011* -
## Mat 116 Algebra 1A

7[3m-(m+2)]>-6(m+3) Use set-builder notation to describe the complete solution {m|m > ? } (type an equality symbol; then type an integer or a simplified fraction.)

*asked on June 16, 2011* -
## math

The atomic number of cadium is half the atomic number of curium. Define a variable and write an expression for the atomic number of cadmium. I'm working in a group with my friends and we need help we're not the same people.

*asked on September 8, 2010* -
## physics

If ball c slid down the hill without friction, how fast would it be traveling the instant it reached the bottom of the hill?

*asked on March 12, 2010* -
## Statistics

How do you code your data?

*asked on October 30, 2009* -
## World History

How are the Assyrian and Phoenician empires alike?

*asked on October 5, 2008* -
## science

what is the life cycle of moss

*asked on May 14, 2008* -
## Is this a correct english sentence?

My father had two sons, from whom I was the oldest, and two daughters. Sorry for the inconveinience, but I'm not English, and I've got some translation to do

*asked on May 10, 2008* -
## english literature

i am writing a research paper about JOHN KEATS and his 3 works ( social political religious or any)_ but i didn't find some of the things about him. my question is: WHAT ARE THE SOCIAL POLITICAL AND RELIGIOUS CONTRIBUTION OF JOHN KEATS TO THE ENGLISH

*asked on April 14, 2008* -
## integrated science

what is.. the modem system of units used by scientists? what is.. the curved surface of a liquid? what is.. a process used to find the volume of an irregularly shaped object? (1) S. I. (International scientific) (2) meniscus (3) total immersion (liquid

*asked on August 7, 2007* -
## Maths

Solve Simultaneous Equetion Using Elimination Method: (A)2x - 3y= -3 and 3x - 7y= -1.

*asked on October 29, 2016* -
## Chem

A student mixed 6 g of ice at -3.4 degrees celsius with 1 g of steam at 103 degrees celsius. What was the final temperature of this mixture.i tried equalling mcdelta T. Please help asap. I would be eternally grateful

*asked on October 19, 2016* -
## functions

What is the rule for input 0 output -1

*asked on February 25, 2014* -
## Math

An investment was worth $1000. By the end of 2010 the investment had lost 30%. What percent must the investment grow by in 2011 to be worth $1000 by the end of 2011? Round your answer to the nearest tenth of a percent.

*asked on January 29, 2014* -
## English paper 3

An discursive essay of this topic , both parrents should assume equal responsibility in raising a child,agree or dis agree

*asked on March 17, 2013* -
## Sciience

Do you know what is qualitative data?Please help me

*asked on March 10, 2013* -
## Math help please!!

Given: angle A is 20˚, b = 50 cm, for what possible range of lengths of side “a” would triangle ABC have two possible solutions (approximate to 2 decimal places)?

*asked on January 20, 2013* -
## Percentage

The usual price of a suitcase was $100. During a sale, a 13% discount was given. Mr Lee bought the suitcase but had to pay 7% GST on the selling price. a.) What was the selling price of the suitcase? b.) How much did Mr Lee pay for the suitcase?

*asked on October 8, 2012* -
## physics

given that the mass of an electron is 9.1 x 10^-28 grams and the charge on an electron is 1.6 x 10^-19 Coulombs, calculate the voltage required to lift an electron 5 cm. the question was previously answered, but I did'nt understand it .. could some show me

*asked on May 19, 2012* -
## science

how does the moon move through space ?

*asked on May 15, 2012* -
## mechanics

Two 20kg weights are hung from light strings that pass over frictionless pulleys. The ends of the strings are connected to a small, light spring balance, S, calibrated in kg. The pulley axes are mounted on the wall of a lift in a 50-storey building. What

*asked on March 7, 2012* -
## Arithmetic

Given the sequence Tq=-7+3(q+4) find T4,and x if Tx=50.

*asked on January 21, 2012* -
## physics

A ball moving with a speed of 26 m/s strikes an identical ball that is initially at rest. After the collision, the incoming ball has been deviated by 1 = 50° from its original direction, and the struck ball moves off at 2 = 29° from the original

*asked on March 9, 2011* -
## biology

A gene for flower color can have multiple alleles like purple, white, or red. true or false?

*asked on January 25, 2011* -
## teacher aide

how children learn

*asked on June 7, 2010* -
## Statistics

What is the Central Limit Theorem and how can it be used in statistics?

*asked on October 14, 2009* -
## Statistics

I have to sample 300 persons. How do I go about doing this and how do I know that the population I have chosen has the characteristics that I am looking for?

*asked on October 14, 2009* -
## Macroeconomics

Which of the following aren't included in the measurement of GDP? Exports Personal income Consumption spending Government spending on goods and services Transfer payments Net interest Imports Investment spending

*asked on June 30, 2009* -
## math

a pasta machine costs $33.The ingredients to make one batch of pasta cost $.33.The same amouunt of pasta puchased at a store costs $.99.How many batches of pasta will you have to make for the cost of the machine and ingrediants to eequal the cost of buying

*asked on December 10, 2008* -
## BEH / 225

On the text from BEH/225 on the book Personality Ch.11 pp. 421 on the summary table Defence Mechanisms. What defense mechanisms have you noticed in the people around you? What do you see as the advantages and disadvantages of these defence mechnaisms?

*asked on December 13, 2007*

## Pages

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