# Determine the length and breadth of a rectangle if the length is 3cm less than twice the breadth, and the perimeter is 18

40,002 questions, page 339
1. ## MATH

In the game of Incan basketball, a points are given for a free throw and b points are given for a field goal, where a and b are positive integers. If a = 2 and b = 5, then it is not possible for a team to score exactly 1 point. Nor is it possible to score

asked by Thumper on April 2, 2010
2. ## physics/chemistry

(a) An ideal gas occupies a volume of 1.0 cm3 at 20°C and atmospheric pressure. Determine the number of molecules of gas in the container. i got that right to be 2.5e19 molecules (b) If the pressure of the 1.0 cm3 volume is reduced to 1.0 10-11 Pa (an

asked by kate on January 3, 2011
3. ## Physics

A 7.80-g bullet moving at 530 m/s penetrates a tree trunk to a depth of 6.2 cm. (a) Use work and energy considerations to find the average frictional force that stops the bullet. (b) Assuming the friction force is constant, determine how much time elapses

asked by Dani on May 3, 2011
4. ## Chemistry

The combustion of carbon monoxide is represented by the equation below: CO (g) + 1/2O2 (g) ----> CO2 (g) a) determine the value of the standard enthalpy change, for the combustion of CO at 298 K using the following info. C (s) + 1/2 O2(g) ----> CO (g)

asked by Nick on October 9, 2007
5. ## Critical Thinking

Identify the correct fallacy of relevance committed by the following arguments, explain how it is used in the example, and determine what is wrong with the reasoning. (ex. What should have been said or argued? 1) Convicted murder Johnny Palko has argued

asked by Alex L. on November 17, 2011
6. ## calculus

use differentials to determine by approximately how many square centimeters does the area of a square table increase if its diagonal is increased from 4 centimeters to 4.092 centimeters the question is The area of table increases by approximately (??)

asked by denial on October 11, 2014
7. ## physics

Chuck Wagon travel with a constant velocity of 0.98 miles/minute for 9.3 minutes. Chuck then decelerates at -0.11 miles/min/min for 1.8 minutes. Determine the total distance traveled by Chuck Wagon (in miles).

asked by Em on September 21, 2017
8. ## Dynamics

A 3kg. package slide down a smooth 30 degrees incline and land on a 10 kg. cart that is at rest.Determine the velocity of the cart and the package immediately after the box land on the cart. The package is released from rest 5m up the incline.

asked by Jerlyn on March 16, 2012
9. ## MATH

The median number of goals scored by 8 players in a certain soccer season is 5. The range of the number of goals scored by those players that season is 4. Determine if the following statement is true, is false, or does not contain enough information. At

asked by rish on May 1, 2016
10. ## calculus

Assume that the radius ,r , of a sphere is expanding at a rate of 10in./min. The volume of a sphere is V=43πr^3. Determine the rate at which the volume is changing with respect to time when r=5in. The volume is changing at a rate of how many in^3/min.?

asked by Marquese on April 30, 2016
11. ## math

State whether the events described are independent or dependent and determine the probability: A bag contains 7 red checkers and 11 black checkers. One checker is drawn and replaced. Then a second checker is drawn. What is the probability that a red

asked by Lo on April 25, 2011
12. ## Chemistry

For the substance SO2F2(g), ΔHºf = -858 kJ mol-1 and the S-F bond, 308.0 kJ mol-1 Determine the average S=O bond energy in SO2F2 in units of kJ. Is my answer right, if so how do I convert this to kJ? x= S=O bond -858= 2(308) + 2(x) -737kJ/mol

asked by Nicky on March 29, 2015
13. ## Chemistry

Given H2(g) + (1/2)O2(g) ---> H2O(l), dH = -286 kJ/mol, determine the standard enthalpy change for the reaction 2h2O(l) ---> 2H2(g) + O2(g) 2H2O(l) ---> 2H2(g) + O2(g) H2(g) + (1/2) O29g) ---> H2O (l) : dH = -286 kJ/mols 2H2O(l) ---> 2H2(g) + 2O2(g) :

asked by AJ on March 26, 2017

Determine the standard form of a quadratic function whose graph has a y intercept of 8 and a vertex at (-2,-4). The answer is f(x)= 3x^2 + 12x +8 but I can't figure out how to get the answer. Solve x^2 + x=6, by factoring. The answer is x=-3,2 but I can't

asked by Heaven on June 1, 2016

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

asked by Sarah on November 6, 2012
16. ## Analytical Mechanics

a gun is fired with muzzle velocity v0 = 1000 m/s straight up along the z-axis. While moving through the air the Earth's gravity pulls on the bullet, which has mass m = 20 grams and the bullet's air resistance force can be approximated by the relationship

asked by Ryan on October 20, 2015
17. ## physics - BOB

PLEASE SEE ADDITIONAL QUESTION AT BOTTOM. A pendulum was set up and measurements were made to enable the mechanical energy to be calculated at the start position S and the lowest point of the pendulums swing L. The mass of the pendulum bob was determined

asked by Sarah on January 30, 2010
18. ## Maths

Five years ago Katie was ten times as old as her daughter Melanie was. In 15 years Katie will be three times as old as Melanie will be in 11 years. Use simultaneous equations to determine Katie and Melanie’s current ages.

asked by Analyn Hughes on August 25, 2016
19. ## Algebra

katie is k years old. harry is 4 years older than katie. rachel is twice as old as harry. if you add together the ages of katie, harry, and rachel the total comes to 36 years. algebraically, determine the age of each person

asked by Anonymous on January 22, 2016
20. ## Algebra

Katie is k years old. Harry is 4 years older than Katie. Rachel is twice as old as Harry. If you add together the ages of Katie, Harry, and Rachel the total comes to 36 years. Algebraically, determine the age of each person.

asked by waffkez on January 21, 2016
21. ## CALC 1

Suppose that h is a function with h'(x) = xe^x. Find all intervals where the function h is concave up. Now, I understand that concavity is determined by the second derivative, so what my question here is, is it just taking the first derivative and then

asked by Brian on November 30, 2014
22. ## Biology

"In guinea pigs, a spotted coat is dominant to uniform coat colour. If a heterozygous spotted coat guinea pig is bred with a uniform coat guinea pig, use a Punnett square to determine the genotypic and phenotypic ratios of the offspring."

asked by Bryanna on January 10, 2010
23. ## physics

An electron starting from rest acquires 4.20 keV of kinetic energy in moving from point A to point B. How much kinetic energy would a proton acquire, starting from rest at B and moving to point A? Determine the ratio of their speeds at the end of their

asked by VJC on September 8, 2010
24. ## math

Loan #1 Year Amount owed 1 \$3796 2 \$3942 3 \$4088 Loan # 2 Year Amount owed 1 \$977.53 2 \$1036.18 3 1098.35 For loan #1 is simple interest. Loan #2 is compound interest How much was each loan originally Determine the future value of each loan after 10 years

asked by Emma on January 19, 2012
25. ## Math-geometry

(a) translate the argument into symbolic form and (b) determine if the argument is valid or invalid. You may compare the argument to a standard form or use a truth table. If Nicholas Thompson teaches this course, then I will get a passing grade. I did not

asked by Jen on July 12, 2011
26. ## Math-geometry

(a) translate the argument into symbolic form and (b) determine if the argument is valid or invalid. You may compare the argument to a standard form or use a truth table. If Nicholas Thompson teaches this course, then I will get a passing grade. I did not

asked by Jen on July 13, 2011
27. ## Math

I really really need help on this one. I have no clue on how to do it; here it is... Determine the maximum and minimum values of the following set of numbers. 3, -36/7, -1, -2/3, 5/4, -5, 26/9 Express the fractions as mixed numbers. For example, 26/9 = 2

asked by G. Torres on July 28, 2007
28. ## Math

From an observation tower that overlooks a runway, the angles of depression of point A, on one side of the runway, and point B, on the opposite side of the runway are, and , respectively. The points and the tower are in the same vertical plane and the

asked by Alan on August 21, 2011
29. ## Math

(a) translate the argument into symbolic form and (b) determine if the argument is valid or invalid. You may compare the argument to a standard form or use a truth table. If Nicholas Thompson teaches this course, then I will get a passing grade. I did not

asked by Jen on July 13, 2011
30. ## Stat's

Choose the probability as a fraction in lowest terms a.5/164490480 b.5/1370754 c.1/1370754 d.1/164490480 determine probability of winning a lottery from which 5 numbers are drawn without replacement from the set of numbers 1 to 46. in order to win, the 5

asked by Valerie on October 26, 2008
31. ## physics help

Damped Oscillations 1. (a) For each of following graphs, determine if graph shows damped oscillation. (b) if it shows damped oscillation : (i) identify damping factor (ii)where damping occurs Note : use a graphing calculator to sketch these graphs f(x) =

asked by kate on February 27, 2010
32. ## physics

A car battery has a rating of 200 ampere·hours (A·h). This rating is one indication of the total charge that the battery can provide to a circuit before failing. What is the total charge (in coulombs) that this battery can provide? Determine the maximum

asked by rick on January 30, 2008

(a) translate the argument into symbolic form and (b) determine if the argument is valid or invalid. You may compare the argument to a standard form or use a truth table. If Nicholas Thompson teaches this course, then I will get a passing grade. I did not

asked by Jen on July 14, 2011
34. ## chemistry

Azomethane, CH3NNCH3, is not a stable compound, and once generated, it decomposes. The rate of decomposition was measured by monitoring the partial pressure of azomethane, in torr. Time (min) 0, 15, 30, 48, 75 Pressure(torr)36.2, 30, 24.9,19.3, 13.1

asked by Jazmin on March 15, 2011
35. ## Math

(a) translate the argument into symbolic form and (b) determine if the argument is valid or invalid. You may compare the argument to a standard form or use a truth table. If Nicholas Thompson teaches this course, then I will get a passing grade. I did not

asked by Jen on July 14, 2011
36. ## Math

(a) translate the argument into symbolic form and (b) determine if the argument is valid or invalid. You may compare the argument to a standard form or use a truth table. If Nicholas Thompson teaches this course, then I will get a passing grade. I did not

asked by Jen on July 14, 2011
37. ## math

Martha is covering kitchen shelves with shelving paper. She has 6 shelves that are each 1 ¾ feet long. She buys 13 ¼ feet of shelving paper of the correct width. Which equation can be used to determine how much paper she will have left over? would that

asked by treshia on October 15, 2014
38. ## physics

The two masses on either side of the pulley, 2.2 kg and 3.6 kg, are each initially 1.8 m above the ground, and the massless frictionless pulley is 4.8m above the ground.What maximum height does the lighter object reach after the system is released? [Hint:

asked by Anonymous on February 14, 2013
39. ## Science

The melting point of pure benzoic acid and pure naphthol are 122.5 *C and 123 *C respectively. You are given a pure sample that is known to be either pure benzoic acid or 2- naphthol. Describe a procedure you will use to determine the identity of the

asked by Francois on January 13, 2019
40. ## math

The butcher shop sells a 3 lb package of chicken legs for \$9.57. The supermarket sells chicken legs for \$7.68/kg. Determine the price per kilogram that each store charges. Which store has the lower price per kilogram?

asked by alan on January 14, 2013
41. ## Physic

A proton is shot into an electric field of magnitude 1x10^4 NC^-1.if the velocity of the proton as it enters the field is 1x10^6 ms^-1 and is perpendicular to the field,determine the magnitude and direction of the velocity in 2 seconds of motion in the

asked by Syam on January 13, 2015
42. ## Linguistics

Determine whether the following are entailment, presupposition, or both. 1) (A) Mary murdered the platypus (B) Mary killed something Is the answer: (a) entails (b) OR (a) presupposes (b) OR both 2) (A) John is taller than Mary (B) Mary is shorter than John

asked by Marcella on March 26, 2011
43. ## physics

A first capacitor is initially connected to potential source ?. The charged capacitor is then removed from the source and connected to a second initially uncharged capacitor. Determine the final potential across the first capacitor long after the switch is

asked by CJ on February 28, 2014
44. ## Math, help needed

Kate bought 3 CDs and 1 DVD at a store. Her friend Joel bought 2 CDs and 2 DVDs. If Kate spent \$20 and Joel spent \$22, determine the cost of a CD and DVD. ~Please provide an explanation as well. Please and thanks!

asked by Mari on January 19, 2012
45. ## Physics

Part 1: Two balls (Ball 1 and Ball 2) are released from the top of a tower. Ball 2 is thrown 3.14 seconds after Ball 1 is dropped. Ball 2 is thrown downward with a velocity of 3.49 m/s. Determine how far apart Ball 1 and Ball 2 are after 5.02 seconds from

asked by Ashley on September 12, 2012
46. ## Physics

Part 1: Two balls (Ball 1 and Ball 2) are released from the top of a tower. Ball 2 is thrown 3.14 seconds after Ball 1 is dropped. Ball 2 is thrown downward with a velocity of 3.49 m/s. Determine how far apart Ball 1 and Ball 2 are after 5.02 seconds from

asked by Ashley on September 12, 2012
47. ## Math

Marco and his friends bought game tokens for \$15 and three admission ticket. Determine if each statement below is true or false. If each admission ticket costs \$2.50, then Marco and his friends spent \$22.50 in all. True or False

asked by Emily on March 3, 2016
48. ## Applied calculas

1. Consider the function y = xx (for x > 0). a) Why does the derivative rule for xn not apply? b) Why does the derivative rule for ax not apply? c) What are the four magic properties of logarithms? d) Take the ln of both sides. Use the properties of

asked by jack on April 8, 2013
49. ## applied calculus

1. Consider the function y = xx (for x> 0). a) Why does the derivative rule for xn not apply? b) Why does the derivative rule for ax not apply? c) What are the four magic properties of logarithms? d) Take the ln of both sides. Use the properties of

asked by jack on April 9, 2013
50. ## Math.

Kate bought 3 CDs and 1 DVD at a store. Her friend Joel bought 2 CDs and 2 DVDs. If Kate spent \$20 and Joel spent \$22, determine the cost of a CD and DVD. ~Please provide an explanation as well. Please and thanks!

asked by Mari on January 19, 2012
51. ## Basic Finance Risk vs Return

Please check and correct my answers. Investors want ____ returns and ___ risk. Answer: high return, low risk Which statement about the efficient set, minimum-variance set and feasible is incorrect? a) the minimum variance is the set of all portfolios with

asked by Anonymous on January 31, 2010
52. ## Calculus

Given the function f(x)= x√(x+3), Indicate the domain of f(x): ………………………… What are the x – intercepts of the graph of f(x)? POINTS! ……………………………. Identify the critical points of f(x) (write pairs of coordinates,

asked by Anonymous on December 16, 2014
53. ## physics

The figure below shows a current loop carrying current I. The loop is made of rectangular and semicircular sections with dimensions as shown. The loop lies in the xy-plane. An external magnetic field is applied B = Bx i + Bz k. Determine the torque (if

asked by shosh on May 28, 2013
54. ## physics

A particle with a charge of -4.0x10^-5 C, a mass of 2.0x10^-7 kg and a velocity of 6.0x10^4 m/s [W] is travelling perpendicularly through an external magnetic field such that the force of gravity is balanced by the magnetic force. Determine the direction

asked by Liz on July 13, 2014
55. ## Chemistry

Cola contains phosphoric acid, H3PO4. In order to determine the concentration of phosphoric acid in 50mL of Cola, a precipitation reaction with excess silver nitrate was carried out. The product, silver phosphate, was dried and found to weigh 0.0576g. What

asked by Anonymous on October 3, 2009
56. ## physics

A particle with a charge of -4.0x10^-5 C, a mass of 2.0x10^-7 kg and a velocity of 6.0x10^4 m/s [W] is travelling perpendicularly through an external magnetic field such that the force of gravity is balanced by the magnetic force. Determine the direction

asked by Liz on July 15, 2014
57. ## geometry

determine why Euler's formula continues to hold for the polyhedron formed by cutting corners off of an octahedron. a) for an octahedron V=__, F=__,E=__ b) when you slice off one corner of the octahedron, you (gain or lose)__ edges. C) therefore, the total

asked by m on December 13, 2010
58. ## Chemistry

Using John Dalton's law of multiple proportions. There are two different compounds of sulfur and fluorine. In SF6, the mass of fluorine per gram of sulfur is 3.55 gF/gS. IN the compound, SFx, the mass of fluorine per gram of sulfur is 1.18 g F/g S. What is

asked by Preston on August 28, 2011
59. ## math

A town of 1200 people has "fan-out" system for emergencies. In an emergency the mayor phone two people. in the next minute each of these people phone two other people . the pattern continues until all 1200 people are contacted. complete yhe tableand

asked by shaila on October 18, 2009
60. ## physics

A particle with a charge of -4.0x10^-5 C, a mass of 2.0x10^-7 kg and a velocity of 6.0x10^4 m/s [W] is travelling perpendicularly through an external magnetic field such that the force of gravity is balanced by the magnetic force. Determine the direction

asked by Liz on July 14, 2014
61. ## Physics help

A particle with a charge of -4.0x10^-5 C, a mass of 2.0x10^-7 kg and a velocity of 6.0x10^4 m/s [W] is travelling perpendicularly through an external magnetic field such that the force of gravity is balanced by the magnetic force. Determine the direction

asked by Liz on July 14, 2014
62. ## math

The eyes of a basket ball player are 6 feet above the floor. He is at the free-throw line, which is 15 feet from the center of the basket rim. The center of the rim is 10 feet above the floor Determine the angle of elevation (to the nearest degree) from

asked by Anonymous on June 3, 2014
63. ## Calculus help

assume that the initial deposit is \$20000 and the nominal annual interest rate is 5.7%. Determine the amount in the account in 10 years if the interest is compounded as follows (round your answers to the nearest dollar): (a) Annually: P=20000(1.057)^10 (b)

asked by Anonymous on June 27, 2014
64. ## science.......

1.a ball with a mass 2kg rests on an incline with an angle of 10 degrees. The ball is released to roll down the incline plane neglecting all friction: Determine the following: A.the loss in potential energy after it has rolled 12m. B. The kinetic energy

asked by Buhle on April 7, 2015
65. ## Precalculus

An item costs \$12.00 in 2016 through an online retailer. Each year, the price will increase by 5% of the previous year’s price. A. Find the general rule for the sequence of the prices for this item. B. Determine what the price will be in 2030. C. If you

asked by Jeff on July 1, 2016
66. ## science;chem

The hydrolysis of ethyl acetate (CH3COOC2H5) by sodium hydroxide yields ethanol (C2H5OH) and sodium acetate (NaO2CCH3) by the reaction shown, which follows second order kinetics. In an experiment 500 mL of 0.1 M ethylacetate in water is mixed with 500 mL

asked by David on December 16, 2017
67. ## Math 10

Hello, I did this question for homework, but my teacher said it was wrong and she didn't explain how it was supposed to be done. So could you please tell me how I am supposed to do this step by step? "A baseball is thrown from the top of a building and

asked by Samantha on April 13, 2014
68. ## Engineeringscience

A ball with a mass of 2kg rests on an angle of 10degrees .The ball is to be released to roll down the incline plane, neglecting all friction determine the following,, a the loss in potential energy after it has rolled 12m, b The kinetic energy after it has

asked by Lucom on June 2, 2015
69. ## chemistry

Archeologists can determine the age of artifacts made of wood or bone by measuring the amount of the radioactive slope 14C present in the object. The amount of isolope decreases in a first-ordrr process. If 12.8% of the original amount of 14C is present in

asked by esme on September 8, 2014
70. ## physics

The rubidium isotope 87Rb is a β emitter that has a half-life of 4.9 x 1010 y that decays into 87Sr. It is used to determine the age of rocks and fossils. Rocks containing the fossils of early animal have a ratio of 87Sr to 87Rb of 0.004. Assuming that

asked by Anonymous on October 10, 2012
71. ## AP Chem

RATES: If you double the concentration of reactant A in the reaction A + 2B ¨ C, what happens to the rate based on the rate law, rate = [A]2 [B]3? The rate would ___ by a factor of ___. increase, 2 increase, 4 decrease, 2 decrease, 4 I can't read some

asked by Chemwiz on January 23, 2007
72. ## question tax

Michelle attended a Canadian University on a full-time basis for eight months in 2014. Her only income for that year was \$14,000 of employment income earned during the summer. She paid tuition fees of \$7,000 in that year. Required: Determine the amount of

asked by college N on May 27, 2015
73. ## FIN 4018 - INCOME TAX PLANNING

Michelle attended a Canadian University on a full-time basis for eight months in 2014. Her only income for that year was \$14,000 of employment income earned during the summer. She paid tuition fees of \$7,000 in that year. Required: Determine the amount of

asked by college N on May 27, 2015
74. ## physics

A door starts from rest and swings with an angular acceleration, alpha, α = 6 rad/s2, where t is in seconds. Determine the angle in radians through which the door turns in the first 3 s. Hint: kinematics equation for angular position (i.e., angle) is

asked by Anonymous on March 1, 2011
75. ## Physics

A) On a calm, bright day, you're scuba diving in a deep lake (n = 1.33), 6.00 m away from your sailboat in the horizontal direction. When you are 2.20 m below the surface, the top of the sailboat mast appears to you to be in a direction 36.0° from

asked by Ted on January 14, 2015
76. ## physics

A door starts from rest and swings with an angular acceleration, alpha, α = 6 rad/s2, where t is in seconds. Determine the angle in radians through which the door turns in the first 3 s. Hint: kinematics equation for angular position (i.e., angle) is

asked by Anonymous on March 2, 2011

1. If 23.00 grams of carbon dioxide and 18.75 grams of water are formed from the combustion reaction. What is the percent yield for CO2 and H20. How much in grams of the excess reactant remains? 2. Balance the equation and determine the mass in grams of

asked by Cassy on April 25, 2014
78. ## Biology

Pod color and pod shape were two other traits Mendel was interested in. Set up a dihybrid cross for these two traits. Note: Green pods are dominant over yellow pods and inflated pods are dominant over constricted pods. -Start off with both parents as

asked by Kayla on December 4, 2014
79. ## pre-calculus

List the possible rational roots of each equation. Then determine the rational roots. 6x^4+35x^3-x^2-7x-1 The answer in the back of the book is: -1/3 and 1/2 I know that I'm supposed to use Descartes rule of signs. I found that there was 1 positive zero

asked by Carl on October 25, 2009
80. ## com/156

When developing your arguments for your final essay, how might you determine what is fact and what is opinion? Does the opinion of an expert in the field carry more weight than the opinion of someone that is not? Explain why or why not. Find one factual

asked by maria on May 14, 2011
81. ## math

The National Center for Education surveyed 4400 college graduates about the lengths of time required to earn their bachelor's degrees. THe sample mean is 5.15 years, and assume that the population standard deviation is known to be 1.68 years. Based on gthe

asked by katy on July 29, 2012
82. ## Physics

An industrial worker accidentally inhaled a radioisotope with an activity of 0.200 kBq. The substance swallowed has a very long effective half-life and therefore the activity will not change significantly during the workers lifetime. Every decay of the

asked by Anonymous on May 17, 2010
83. ## chemistry

a hydrocarbon was burnt completely and the products were bubbled into excess of Ca(OH)2 solution. The resulting mixture was filtered, and the residue dried and weighed. The mass of the hydrocarbon was found to be 10.00g. In a separate experiment, the same

asked by kandace on June 19, 2016
84. ## Math

A basket of flowers weighing 2kg is placed on a flat grassy slope. The coefficient of static friction between the basket and the slope is 0.4, and the basket is on the point of slipping down the slope. Draw a force diagram to indicate forces (including

asked by s17 on December 4, 2016
85. ## Physics

An industrial worker accidentally inhaled a radioisotope with an activity of 0.200 kBq. The substance swallowed has a very long effective half-life and therefore the activity will not change significantly during the workerâ€™s lifetime. Every decay of

asked by Kirsten on May 16, 2010
86. ## Materials Science & Physics

Consider a tetragonal phase of which the lattice parameters satisfy c = 2a. Diffusivities of the phase were measured in two different directions as: 6.0x10-12 cm2/sec along [101] and 8.0x10-12 cm2/sec along [001]. (a) Determine the diffusivity tensor (Dij)

asked by Jinwon on October 6, 2013
87. ## chemistry

Consider a sample of a hydrocarbon (a compound consisting of only carbon and hydrogen) at 0.959 atm and 298 K. Upon combusting the entire sample in oxygen, you collect a mixture of gaseous carbon dioxide and water vapor at 0.755 atm and 375 K. This mixture

asked by Jaxx on February 27, 2015
88. ## chemestry

a student heats 2.005 g of a copper bromide hydrate of unknown molecular formula, completely driving off the water of hydration, and notices that the weight drops to 0.998g. Upon reduction with excess aluminum metal, the copper ions are reduced to 0.442 g

asked by anonimo on September 21, 2011
89. ## Physics

Determine the fuel needed to safely land a spacecraft. Start at y = 100km. Landing is y = 0km. Vy < 25 m/sec is a safe landing speed. g = -1.354 m/s^2 Acceleration due to thrust (where fuel used is 100 kgs*Ay-thrust Amax = 30 m/s^2 Amin = 5 m/s^2 What I

asked by Mike on December 4, 2012
90. ## chemistry

For each trial, enter the amount of heat gained by the chemical system of ammonium nitrate, qrxn. The specific heat of water is 4.184 J/goC. Report your answer using 4 digits. The information given is: Trial # Tiwater Tf Masswater #1: 21.2 10.8 24.990 #2:

asked by Megan on April 6, 2010
91. ## physics

a wheel revolves about a fixed horizontal axis through O (the center). During a certain interval of time, the angular velocity (which initially is 20 rad per second clockwise) changes uniformly at such a rate that the angular displacement is 60 rad

asked by stan on January 31, 2011
92. ## Pre-Calculus (Check)

Please tell me what I'm doing wrong... The side lengths of tops of three squares tables can be described as three consecutive integers. The combined area of the table tops is 677 sq in. Algebraically, determine the roots of the quadratic equation. (I'll

asked by Lucina on April 14, 2015
93. ## PHYSICS 1 ..lab helllpppppppp

1.described the motion of mud that flies off from a rapidly spinning wheel. 2.explain why the outer rail is higher than the inner rail of curve in a railroad track. 3. a 5kg mass is moving in a circle of a radius 3m at a speed of 30 m/sec.determine the

asked by JORHO on January 28, 2013
94. ## Chemistry

The question representing the production of tetraphosphorus trisulfide (P4S3), a substance used in some match hears, is 8P4 + 3S8 ---> 8P4S3. Determine if each of the following statements is correct. If the statement is incorrect, rewrite it to make it

asked by Montanna on November 14, 2012
95. ## physics

1. A solid copper cylinder hangs at the bottom of a steel wire of negligible mass. The top end of the wire is fixed. When the wire is struck, it emits sound with a fundamental frequency of 300 Hz. The copper cylinder is then submerged in water so that half

asked by vijay krishna on February 21, 2011
96. ## Dynamics

It takes 16s to raise a 2800lb car and the supporting 650lb hydraulic car-lift platform to a ht of 6.5 ft. Knowing that the overall conversion efficiency from electric to mechanical power for the system is 82% determine a) the average power output

asked by Amelia on February 22, 2013
97. ## Math

How does the related acute angle help to determine the trigonometric ratios of angles greater than 90 degrees? (in terms of the Cartesian plane) And why is the sin, cos, and tan of the principal angle equal to the sin, cos, and tan of the related acute

asked by Crystal on November 24, 2012
98. ## calculas

A buoy oscillates in simple harmonic motion y = A cos(ωt) as waves move past it. The buoy moves a total of 2.7 feet (vertically) from its low point to its high point. It returns to its high point every 18 seconds. (a) Write an equation describing the

asked by Sagar on March 26, 2016
99. ## physics

The dipole moment for a system of charges is defined as d⃗ =∑kqkr⃗ k. (see here for a more in depth discussion of the dipole moment). Determine the magnitude of the dipole moment in m⋅C for a system of three charges (Q=1 μC, Q=1 μC, and

asked by keshav on June 4, 2013
100. ## math

Stamps come in large sheets with perforations in between. How many different ways can you buy 4 attached square stamps? ( Two ways to put them together are considered the same if one way can be turned or flipped so that its outline looks like the other

asked by Preston on January 23, 2007