# Posts by martin

Total # Posts: 214

**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.

*February 28, 2017*

**Math (Pre algebra )**

368 gallons / 32 miles per gallon = 11.5 gallons

*January 23, 2017*

**Maths**

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

*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. Please answer in kj or J only

*October 19, 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

*October 19, 2016*

**Science**

A snooker ball X of mass 0.3kg moving at 5m/s hit 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

*September 2, 2016*

**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?

*July 23, 2016*

**Life orientation**

Six ways

*April 17, 2016*

**school of the nation**

Marie gets $500 pocket money each day,she spends $300 each day. Write fractions to show the money spent and money left: (1) at the end of 1 day (2) at the end of 1 week

*October 13, 2015*

**physics**

hf=hi+1/2 g t^2 + vit hf, hi=0 t= 2vi/g horizontal distance= t*17.5m/s

*September 11, 2015*

**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, darkening in the ...

*August 14, 2015*

**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 > 1930 } ?

*June 2, 2015*

**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 > 1930 } ?

*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.

*June 2, 2015*

**History :)**

Civil Rights

*April 3, 2015*

**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 will help! Thanks! :)

*April 3, 2015*

**Science**

I think they should measure the temperature

*March 22, 2015*

**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 due east with a ...

*March 1, 2015*

**Political Science**

States’ rights to regulate may not trample on powers specifically reserved for Congress. 100% right

*February 1, 2015*

**Political Science**

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

*February 1, 2015*

**Political Science**

No state may distinguish between gay marriage and heterosexual marriage because that would effectively create invidious distinctions. This is 100% answer

*February 1, 2015*

**Political Science**

If the Supreme Court were to rule that gay marriage is a fundamental right, under the Equal Protection Clause of the Fourteenth Amendment, that would mean?

*February 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 Supreme Court will ...

*February 1, 2015*

**Math**

What is the greatest common factor of 32 and 40? the answer is 8

*February 1, 2015*

**Political Science**

The states’ rights supersede national authority. Right

*February 1, 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?

*February 1, 2015*

**Chemistry**

What is the molarity of 35.0 of NaCl in 125 mL of water?

*November 10, 2014*

**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

*November 2, 2014*

**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.)

*October 23, 2014*

**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 explosion?

*June 20, 2014*

**algebra 1**

24 gallons

*April 29, 2014*

**physics**

4140

*March 26, 2014*

**math**

Don't know

*March 18, 2014*

**Math**

would it be negative 17?

*March 13, 2014*

**Math**

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

*March 13, 2014*

**functions**

What is the rule for input 0 output -1

*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.

*January 29, 2014*

**Math**

7.99 meters or 8.01 meters

*January 29, 2014*

**History**

What would Jackie Robinson (might) accomplish as president of USA

*January 20, 2014*

**Physics**

Yep, 8*10*-6 is the answer. A square loop of wire of side L with total resistance R moves at constant speed v into a region of uniform magnetic field B pointing perpendicular to the plane of the loop. What is the average current that is induced. Iave=BL^2/R is that the answer???

*December 12, 2013*

**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.

*September 18, 2013*

**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?

*September 6, 2013*

**Math**

The number N of state and federal inmates in millions during year x, where x>2002 can be approximated by the following formula N=0.04x-79.02

*July 18, 2013*

**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) when it's speed is...

*May 19, 2013*

**Physics 1**

I'm sorry when it's speed is 15 m/s. doesn't say uniform

*May 18, 2013*

**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.

*May 18, 2013*

**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.

*May 18, 2013*

**Math/ Calculus Help1**

Supplies are dropped from a stationary (not moving up or down) helicopter and, after some amount of time, land on the ground with a velocity of -160 feet per second. Assumptions: Start time at t = 0 and ignore air resistance. Recall that the height function is given by y(t)= ...

*April 16, 2013*

**CHEM**

Yes, I can use the Ka of HClO. (hypochlorite ion from hypochlorous) HClO is a weak acid with a Ka of 2.9*10-8 The pKa = 7.54 (-log of the Ka) Since the concentration ratio is equal to 1 and the log of 1 is zero, the pH would equal the pKa. Please verify

*April 13, 2013*

**CHEM**

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

*April 13, 2013*

**math**

what would 1.25 be as a fraction?

*March 26, 2013*

**math**

can you divide a fraction into another fraction?

*March 26, 2013*

**English paper 3**

Write a dialogue in wich you convince your teacher that you are too sick to participate in sports for thed day

*March 17, 2013*

**English paper 3**

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

*March 17, 2013*

**Sciience**

Do you know what is qualitative data?Please help me

*March 10, 2013*

**POL 201**

Under the War Powers Act, the President? 1)may never use force unless Congress first authorizes it. Answer 2)may in effect fight a 90 day war without a declaration from Congress. 3)can act unilaterally in matters of military action. 4)gives over control of “police ...

*February 3, 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)?

*January 20, 2013*

**MATH HELP!!!**

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

*January 20, 2013*

**chemistry**

Is 39.2 in KJ/mol? please help

*January 12, 2013*

**science**

please drwls, what is the answer of a and b

*January 12, 2013*

**chemistry**

50 g Si doped with 27g Sb

*January 12, 2013*

**Chemistry**

1KJ/mol=1.03*10^-2EV please somebody tell about b

*January 11, 2013*

**Chemistry**

somebody please tell the answer of b. I tried with all equation. D=D0e^-Ea/RT Created Eq.1 for 35+273K and Eq.2 for 45+273k i got Ea 1.55*10^4J/mol even after conversion with j/mol to EV not getting green check 1KJ/mol=1.03*10^-2 if some body got green check please suggest me.

*January 11, 2013*

**Chemistry**

what would be answer of b. would it be 45

*January 11, 2013*

**Chemistry**

someone please help regarding answer of a and b. 18 is not showing green check

*January 11, 2013*

**Chemistry**

rufus, please what is answer

*January 11, 2013*

**Chemistry**

chacho,could you please explain the answer when de broglie wavelength 0.468*10^-10m.

*January 11, 2013*

**chemistry**

1ev= 1.69*10^-19 J

*January 11, 2013*

**chemistry**

39.2 is wrong answer. could you please help for the answer of b

*January 11, 2013*

**Chemistry**

could any one help me regarding correct answer of this question

*January 11, 2013*

**Chemistry**

Anonymous, could you please explain the answer. the answer you mentioned is wrong

*January 11, 2013*

**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?

*October 9, 2012*

**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?

*October 8, 2012*

**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

*October 4, 2012*

**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

*July 17, 2012*

**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?

*June 28, 2012*

**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?

*June 28, 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 again please.

*May 19, 2012*

**physics**

Hi Damon .. where did the 10^-3 come from? .. I understand the 9.8 is gravity and the 5 is 5 cm

*May 19, 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. not quite sure how to do this.

*May 19, 2012*

**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 get easier? I hope so.

*May 19, 2012*

**Physics 30**

Hello damon... I'm not sure what happened there... what happened to the 5.0 x 10^-6 Could you show me again, as I don't quite understand it. thanks martin

*May 19, 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

*May 19, 2012*

**science**

how does the moon move through space ?

*May 15, 2012*

**Math**

3x2x4

*May 8, 2012*

**math**

write three ways to find 3x2x4

*May 5, 2012*

**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 down the ...

*March 11, 2012*

**math**

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

*March 10, 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 is the reading on the ...

*March 7, 2012*

**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 up-face P(1)=0 P(2)=1/6 P(...

*March 2, 2012*

**geometry**

A ball gas a radius of 56mm (a)Calculate the surface area (b)What is the volume of the sphere

*February 28, 2012*

**psy230**

don't know

*February 16, 2012*

**Arithmetic**

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

*January 21, 2012*

**arithmetic**

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

*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

*December 28, 2011*

**Chemistry**

I don't understand the part when it says 100-X/X. How do you solve for X?

*December 7, 2011*

**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.

*December 7, 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 equivalence relation ...

*November 18, 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 values of the two cards ...

*November 15, 2011*

**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)?

*November 1, 2011*