Tuesday

July 22, 2014

July 22, 2014

Total # Posts: 3,840

**Physics URGENT!!!**

A spring of negligible mass stretches 2.14 cm from its relaxed length when a force of 8.40 N is applied. A 1.300 kg particle rests on a frictionless horizontal surface and is attached to the free end of the spring. The particle is displaced from the origin to x=5.00 cm and rel...

**algebra**

Find the cost of a home in 20 years, assuming an annual inflation rate of 5%, if the present value of the house is $260,000.

**chemistry... HELP !!!!!!!**

The average bond enthalpy for C__H is 413 kJ/mol. In other words, 413 kJ of energy is required to break a mole of CH into atoms: CH (g) ----> C(g) + H(g) delta H= 413 kJ Using this information, and enthalpy of C6H6=5535kJ, calculate the enthalpy change of the reaction: C6H6...

**CHEMISTRY**

Consider a 58.4 g sample of H2O(g) at 125°C. What phase or phases are present when -162 kJ of energy is removed from this sample? Specific heat capacities: ice, 2.1 J g-1 °C-1; liquid, 4.2 J g-1 °C-1; steam, 2.0 J g-1 °C-1, ΔHvap = 40.7 kJ/mol, ΔHfus ...

**CALCULUS**

Find the length of the curve: y=ln(1-x^2), 0<_x<_1/2

**CALCULUS**

Let R be the region bounded by y=e^x, y=2. and the y-axis. Find the volume of the solid obtained by rotating the y-axis.

**trig**

given that 1/2pi<theta<pi and sin theta=1/5, use appropriate trigonometric formulas to find the exact values of the following (i) cos(2theta) (ii) cos theta (iii) sin(2theta)

**PHYSICS**

At what temperature would the rms speed of a nitrogen atom equal the following speeds? (Note: The mass of a nitrogen atom is 2.324 10-26 kg.) (a) the escape speed from Earth, 1.12 104 m/s _____K (b) the escape speed from the Moon, 2.37 103 m/s _____K

**PHYSICS**

An air bubble has a volume of 1.65 cm3 when it is released by a submarine 105 m below the surface of a lake. What is the volume of the bubble when it reaches the surface? Assume the temperature and the number of air molecules in the bubble remain constant during its ascent. __...

**PHYSICS**

One mole of oxygen gas is at a pressure of 5.25 atm and a temperature of 29.5°C. (a) If the gas is heated at constant volume until the pressure triples, what is the final temperature? ____°C (b) If the gas is heated so that both the pressure and volume are doubled, wha...

**PHYSICS**

The average coefficient of volume expansion for carbon tetrachloride is 5.81 10-4 (°C)−1. If a 42.5-gal steel container is filled completely with carbon tetrachloride when the temperature is 10°C, how much will spill over when the temperature rises to 26.5°C?...

**PHYSICS**

The Trans-Alaskan pipeline is 1300 km long, reaching from Prudhoe Bay to the port of Valdez, and is subject to temperatures ranging from -72°C to +38°C. (a) How much does the steel pipeline expand due to the difference in temperature? (The coefficient of linear expansi...

**PHYSICS**

Lead has a density of 1.13 104 kg/m3 at 0°C. (a) What is the density of lead at 86°C? ___kg/m3 (b) Based on your answer to part (a), now consider a situation in which you plan to invest in a gold bar. Would you be better off buying it on a warm day? Yes or No Explain.

**Chemistry**

What is the wavelength in Angstroms of radiation that has a frequency of 4.00 x 10^14 s-1? I tried the equation wavelength= constant / frequency. And the fact that 1 Angstrom = 1x 10^-10 m, but I don't see how the correct answer turns out to be 7.5 x 10^3

**Chemistry**

What is the energy in Joules of a mole of photons of microwave light having a frequency typical of microwave? (frequency = 3.0 x 10^9 Hz) I tried using the equation E= h x frequency, but I ended up with the answer 1.98 x 10^-24 instead of the correct answer 1.2 J, so there mus...

**Chemistry **

What is the total volume of gases produced at 819 K and 1. atm pressure when 320 g of ammonium nitrite undergoes the following decomposition reaction? NH4NO2 --------> N2(g) + 2H2O(g)

**Chemistry**

Thanks so much, I would of never figured out that out myself past the empirical formula since I forgot about the 22.4L factor. The molar mass turns out to be 70, and since the only answer I was given that adds up to 70 is C5H10, it's an easy pick. Pentane!

**Chemistry**

An unknown gaseous hydrocarbon consists of 85.63% carbon by mass. A 0.335 g sample of the gas occupies a volume of 0.107 L at STP. What is the identity of the gas?

**Chemistry**

A 3.80 L cylinder contains 6.83g of methane, CH4, at a pressure of 3320 mmHg. What is the temperature of the gas? I know you use the formula PV= nRT, but I can't seem to get two sides equal each other, thus having the wrong temp. My guess is that I have to change mmHg to a...

**Physics HELP!!**

Four masses are connected by 27.1cm long, massless, rigid rods. If massA=237.0g, massB=511.0g, massC=257.0g, and massD=517.0g, what are the coordinates of the center of mass if the origin is located at mass A? ^ I already got this part: x coordinate- 13.78 cm y coordinate- 13....

**Physics**

A street lamp weighs 160 N. It is supportedequally by two wires that form an angle of 119 with each other. What is the tension of each of these wires? Answer in units of N

**Chemistry**

A 3.80 L cylinder contains 6.83 g of methane, CH4, at a pressure of 3320 mmHg. What is the temp. Of the gas? I mainly have problems being able to tell which gas law equation I need to use when asked these types of questions and then being able to rearrange the equation to find...

**Physics**

A hiker who weighs 834N, is strolling through the woods and crosses a small horizontal bridge. The bridge is uniform, weighs 3520N, and rests on two concrete supports at each end. He stops one-fifth of the way along the bridge. What is the magnitude of the force that a concret...

**Physics HELP!! pleasee**

A uniform plank of length 5.0 m and weight 231N rests horizontally on two supports, with d = 1.34m of the plank hanging over the right support. To what distance, x, can a person who weighs 477N walk on the overhanging part of the plank before it just begins to tip?

**Physics B**

Part 1 A 36 kg girl is standing on a 65 kg plank. The plank, originally at rest, is free to slide on a frozen lake, which is a ﬂat, frictionless supporting surface. The girl begins to walk along the plank at a constant speed of 1.89 m/s to the right relative to the plan...

**Algebra**

2x+3=-2x+5 I think the answer is 8 ______________________________ 1-2x-5=4x+2 2x=8? X=4? I doubt I got this right

**Algebra**

3x + 7= -x - 1 -3x=x-(6-2x) 1-2x-5=4x+2 2x+3=-2x+5 I cant remember the steps to evaluate.

**Its math, cmon answer!!!**

Andrew guess what, I was a tid bit busy. So spare the tude. thanks Bobpursley.

**Its math, cmon answer!!!**

This is my HW problem; I'm thinking of a number. When I double my number, subtract five, and then add my original number, I get one. What's my number?

**physics**

A cook holds a 2.66-kg carton of milk at arm's length (see the figure below). What force B must be exerted by the biceps muscle? (Ignore the weight of the forearm. State the magnitude of the force B.)

**physics**

Suppose a 34.5-kg child sits 1.17 m to the left of center on the same seesaw as the problem you just solved in the PRACTICE IT section. A second child sits at the end on the opposite side, and the system is balanced.

**physics**

k(.005m)=((8.99X10^9)*(2.70X10^-6)*(8.60X10^-6))/(.09m)^2 k=5.15X10^3

**economics**

1. When the government attempts to cover large deficits by creating more money, what is the probable result called? (1 point) (0 pts) government borrowing (1 pt) hyperinflation (0 pts) excess currency (0 pts) full employment 1 /1 point 2. What is one of the major problems caus...

**caluculating the interest! please help**

Calculate the interest on a $1700 credit card bill that shows a 22% APR, using the average daily balance method. Assume you sent a payment of $375 on the first day of a month that has 30 days and it takes 5 days for this payment to be received and recorded. Round to the neares...

**MATH**

you mean 1700x0.02x1/12=31.16? that is not the right answer though :(

**MATH**

Calculate the interest on a $1700 credit card bill that shows a 22% APR, using the average daily balance method. Assume you sent a payment of $375 on the first day of a month that has 30 days and it takes 5 days for this payment to be received and recorded. Round to the neares...

**Physics- PLEASE HELP**

A 10.0 kg cylinder rolls without slipping on a rough surface. At an instant when its center of gravity has a speed of 16.0 m/s, determine (a) the translational kinetic energy of its center of gravity.(b) the rotational kinetic energy about its center of gravity, and (c) its t...

**chemistry **

Given the reaction: H2SO4 = 2NaOH -> NaSO4 = 2H20. Determine the # of moles of sulfuric acid id needed to completely react with 2.3 L of 0.5 M of NaOH. Then determine the concentration of the solution if 3.0 L of it are used instead.

**chemistry **

Given the reaction: H2SO4 = 2NaOH -> NaSO4 = 2H20. Determine the # of moles of sulfuric acid id needed to completely react with 2.3 L of 0.5 M of NaOH. Then determine the concentration of the solution if 3.0 L of it are used instead.

**Physics**

A crane lifts the 22000kg steel hull of a ship out of the water. Determine the tension in the crane's cable when the hull is submerged in the water. Determine the tension when the hull is completely out of the water.

**Physics**

A 19cm radius air duct is used to replenish the air of a room 9.2m x 6.0m x 4.0m every 18min . How fast does air flow in the duct?

**Physics**

What is the total force on the bottom of a swimming pool 27.5m by 9.0m whose uniform depth is 1.9m? physics What is the absolute pressure on the bottom of a swimming pool? What will be the pressure against the side of the pool near the bottom?

**physics**

a drunken motorist who is moving at a constant velocity of 90 km/h passes a stationary police patrol car. The patrol car immediately gives chase at a constant acceleration and catches up with the motorist after a distance of 10 km. Calculate the time taken by the patrol car to...

**Physics**

A car is stopped at a stoplight. When the light turns green, it accelerates with a constant acceleration of 2.5 m/s^2. At the same instant, a truck passes the car in the same direction with a constant velocity of 15 m/s. how long until the car catches the truck?

**math**

how many possible combinations are there to make $1.55 using a dollar, dimes and pennies?

**math**

how do i find the equivalent decimal for 2 3/4

**PHYSICS HELP-multiple choice**

A red ball with a velocity of +3.0 m/s collides head-on with a yellow ball of equal mass moving with a velocity of -2.0 m/s. What is the velocity of the red ball after the collision? A. zero. B. -2.0 m/s. C. +3.0 m/s. D. +2.5 m/s. E. +5.0 m/s. I think zero but need a second op...

**Physics**

A(n) 95.7 kg boxer has his first match in the Canal Zone with gravitational acceler- ation 9.782 m/s2 and his second match at the North Pole with gravitational accelera- tion 9.832 m/s2. a) What is his mass in the Canal Zone? Answer in units of kg b) What is his weight in the ...

**Physics**

A(n) 95.7 kg boxer has his first match in the Canal Zone with gravitational acceler-ation 9.782 m/s2 and his second match at the North Pole with gravitational accelera- tion 9.832 m/s2.

**Computer Science**

public class RandomPhoneNumber { public static void main(String[] args) { int num1=(int)(Math.random()*7); int num2=(int)(Math.random()*7); int num3=(int)(Math.random()*7); int set1=(int)(100+Math.random()*642); int set2=(int)(1000+Math.random()*8000); System.out.println("...

**Physics- Elena please help!**

Assume you are agile enough to run across a horizontal surface at 11.60 m/s on an airless spherical asteroid of uniform density 1.0x103 kg/m3, independently of the value of the gravitational field. To launch yourself into orbit by running, what would be (a) the radius? (b) the...

**Chemistry**

a silver coin has a mass of 2.50g and is analysed for silver by dissolving in dilute nitric acid, and precipitating silver as solid AgCl and weighing this. if the percipitat weighs 2.99g what percentage of silver is the coin?

**Geometry**

Which statement about a figure ABCD would always be true ?

**Organic Chemistry**

I think I got something: there should be 2 Rf values, since there are two components; maybe the spot was not concentrated enough. So the way to fix the error would be to make the spot bigger. Is this right?

**Organic Chemistry**

Identify the error in the following scenario and indicate how you would fix the error: A TLC of a two component mixture of pentene and 1,3-diethylbenzene was run in acetone. An Rf value of 0.90 was reported.

**CHEMISTRY**

Calculate the change in entropy that occurs when 17.68 g of ice at -12.7°C is placed in 54.05 g of water at 100.0°C in a perfectly insulated vessel. Assume that the molar heat capacities for H2O(s) and H2O(l) are 37.5 J K-1 mol-1 and 75.3 J K-1 mol-1, respectively, and...

**math**

A right triangle is formed in the first quadrant by the x- and y-axes and a line through the point (2,3). Draw a figure that illustrates the problem. What is the area of the triangle A as a function of the x-intercept of the line?

**Physics help PLZ!!**

Estimate the energy required from fuel to launch a 1465 kg satellite into orbit 1375 km above the Earth’s surface. Consider two cases: (a) the satellite is launched into an equatorial orbit from a point on the Earth’s equator, and (b) it is launched from the North Po...

**Algebra**

thank you so much!!! 😄

**Algebra**

2-(3x-4)=2x-9 X=? help would be lovely 😊

**arithmetic**

$30.00 x .6/2-$17.50=

**Force Physics**

I don't know how to find the answer to the bottom scale yet; but I found the top scale by adding both the masses. Then times that number by 10, which is g.

**science**

The block of mass 4.44723 kg has an acceleration of 4.6 m/s^2 4.44723 kg F is at 30◦ a What is the magnitude of F? Assume the acceleration due to gravity is 9.8 m/s 2 and the surface is frictionless. Answer in units of N

**science**

A 14700 kg sailboat experiences an eastward force of 29800 N due to tide pushing its hull while the wind pushes the sails with a force of 81500 N directed toward the northwest (45◦ westward of North or 45◦ northward of West). What is the magnitude of the resultant ...

**Math**

oh, okay. now I get it. thanks!!!

**Math**

this is confusing :( this is how I am solving. 66 2/3 12 ------- = ----- 100 W so i mulitiplyed 100x12= 2100. and from here I don't know how to insert 66 2/3 into calculator. 2100 divided by 66.667? the choice to answers are 14, 3.17, 315 and 31.5 I know for sure that 14 i...

**Math**

21 is (66 and 2/3)% of what number? I believe the answer is 14. is it right?

**statistics**

A group of 200 students takes the Kaplan course in hopes that it will improve their SAT scores above the national mean of 500 on the math section. The population standard deviation of the SAT is known to be 100. Use an alpha level of .05 when answering the following questions....

**Physics**

A 50kg object is moving at 25m/sec. How many calories are generated when the object brakes to a stop?

**Physics**

** TWO very small..

**Physics**

wo very small spheres are initially neutral and separated by a distance of 2.73 m. Suppose that 2.60E+13 electrons are removed from one sphere and placed on the other. What is the magnitude of the electrostatic force that acts on each sphere?

**Chemistry**

A 0.105-L sample of an unknown HNO3 solution required 36.9 mL of 0.200 M Ba(OH)2 for complete neutralization. What was the concentration of the HNO3 solution?

**Physics**

Aiyana drives for 100 s at a rate of 20m/s, then turns around and drives for another 200 s at a rate of 30m/s and completes the rest of her journey at a rate of 90m/s for 100 s. what is her average velocity?

**Spanish**

me estoy cepillando los dientes me estoy maquillando me estoy bano me estoy sacando la basura me estoy poniendo me estoy nerviosa

**c++**

Your Mathematic school teacher want to use a program that can read the name and the mark of a student. Your teacher want the program to automatically find the grade of the mark and display the result(name, mark and grade). Help your teacher to develop a program that can solve ...

**CHEMISTRY**

The enthalpy of neutralization for the reaction of a strong acid with a strong base is −56 kJ/mol of water produced. How much energy will be released when 200.5 mL of 0.400 M HCl is mixed with 149.1 mL of 0.500 M NaOH?

**Chemistry**

Integrate the expression β = 1/V (δV / δT) at constant pressure, assuming that β is independent of temperature. By doing so, obtain an expression for V as a function of T and β at constant P.

**physics**

A skier squats low and races down an 11◦ ski slope. During a 3 s interval, the skier accelerates at 2.7 m/s^2 . What is the horizontal component of the skier’s acceleration (perpendicular to the direction of free fall)? Answer in units of m/s^2.

**physics**

How long does it take a rocket to change its velocity by 57 m/s while accelerating at 53.7 m/s2? Round your answer to 2 decimal places.

**world history**

D. Something to be shared with conquered people.

**math**

what is the greatest zero of the function y=x^2-25+66

**Math**

Write the ratio in three different formats:a to b ,a : b , and a/b . Carlos biked 24 miles and ran 6 miles. Write the ratio of the distance Carlos biked to the total distance.

**math**

the frame for a shipping crate is to be constructed from 24 feet of 2 by 2 lumber. if the crate is to have square ends of side x feet, express the outer volume V as a function of x (disregard the thickness of the lumber)

**Math**

Six people are going to sit in a row on a bench. Romeo wasnts to sit next to Juliet. Caesar does not want to sit next to Brutus. Homer and Pierre can sit anywhere. In how many ways can these people be seated?

**math**

Abby takes 6 steps forward, then 2 steps back. If she repeats this pattern, how many steps will she be from where she started after 4 moves? After 5 moves?

**The digits**

0-9 are the building blocks for all numbers.what this means.

**Math**

Abby takes 6 steps forward, then 2 steps back. If she repeats this pattern, how many steps will she be from where she started after 4 moves? After 5 moves?

**physics**

Your groceries are in a bag with paper handles. The handles will tear off if a force greater than 58.4 N is applied to them. What is the greatest mass of groceries that can be lifted safely with this bag, given that the bag is raised (a) with constant speed, or (b) with an ac...

**chemistry**

How many grams of hydrogen can be prepared by treating 2.63 g of iron with 130.0 mL of 1.50 M sulfuric acid solution, to give iron(III) sulfate and hydrogen?

**physics**

According to Kepler's third law, the orbital period T of a planet is related to the radius R of its orbit by T2 R3. A planet's orbit is larger than Earth's by a factor if 3.39. What is the planet's orbital period?

**math**

A jar has eight red, nine blue, and ten green marbles. What is the least number of marbles that you can remove from the jar and be certain that you have three of the same color?

**physics**

Less than 215

**Physics**

A jet plane is cruising at 225.0m/s when suddenly the pilot turns the engines up to full throttle. After travelling 2.26km, the jet is moving with a speed of 392.0m/s. What is the jet's acceleration, assuming it to be a constant acceleration?

**Physics**

Larry leaves home at 2:08 and runs at a constant speed to the lamppost. He reaches the lamppost at 2:12, immediately turns, and runs to the tree. Larry arrives at the tree at 2:28. What is Larry's average velocity during his trip from home to the lamppost, if the lamppost ...

**Chemistry Pretest**

Last and final question: Consider the reaction 2KNO3 + 10K ---> 6K2O + N2. If 155 grams of K reacted with 122 grams of KNO3, what is the limiting reagent? a) KNO3 b) K c) Neither d) not enough information I would think it's d? Because it doesn't ask to know either t...

**Chemistry Pretest**

Fe can be prepared as 2 Al + Fe2O3 ----> 2 Fe + Al2O3. Suppose that 0.450 moles of Fe2O3 are reacted with an excess of Al. Suppose that 43.6 grams of Fe are obtained. What is the percent yield of Fe? a) 16.2% b) 60.7% c) 86.7% d) 43.4% Percent yield= actual yield of product...

**Chemistry Pretest**

Consider the following balanced equation. 2 H2 + O2 ---> 2 H2O Which of the following statements is false? a) One molecule of O2 will react with 2 molecules of H2 b) One mole of O2 will react with 2 moles of H2 c) The complete reaction of 32.0 g of O2 will produce 2 moles o...

**Chemistry Pretest**

11. How many moles of CO2 would be produced from 56 moles of O2 according to the following balanced equation? 2 C2H6 + 7 O2 ---> 4 CO2 = 6 H20 a) 16 b) 32 c) 224 d) 48 e) 8

**Chemistry Pretest**

1. What mass of the compound FeWO4 contains 50.0 grams of tungsten (atomic symbol W, atomic number= 74)? **Formula mass of FeWO4 is 303.69** a) 30.0 g FeWO4 b) 304 g FeWO4 c) 82.6 g FeWO4 d) 188 g FeWO4

**Spanish**

It depends on the region, but in Spain, they usually add "-ito"

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