# jack

Popular questions and responses by jack-
## spanish

I need hep unscrambling these words can anyone help? 1)GJAUDRO 2)ARBCUE 3)EUPQIO 4)MCLICISO 5)PEASRA 6)NEIST

*asked on January 31, 2014* -
## College Physics

A student of mass M = 82 kg takes a ride in a frictionless loop-the-loop at an amusement park. The radius of the loop-the-loop is R = 15 m. The force due to the seat on the student at the top of the loop-the-loop is FN = 696 N and is vertically down. What

*asked on March 17, 2016* -
## Math

There are 12 animals in a farm.some are cows the rest are chickens.there are 28 animals legs in all.how many cows are there? how many chickens are there ?

*asked on August 26, 2016* -
## critical thinking test AU

1. Question : The average height of members of the high school basketball team is six feet, three inches. Jerry is on the high school basketball team, so Jerry must be taller than six feet. The argument above is flawed because it confuses: Student Answer:

*asked on March 12, 2012* -
## probability

Humans carry two copies of most genes. Individuals that carry two identical variants of a gene are called homozygous whereas those that carry two different variants are called heterozygous. For example, if there are two possible variants labelled A and a,

*asked on August 1, 2020* -
## calculus

Evaluate the Riemann sum for f(x) = 5 −1/2x, 2 ≤ x ≤ 14,with six subintervals, taking the sample points to be left endpoints. I don't understand is the answer 18?

*asked on July 15, 2020* -
## Physics

A block slides down a frictionless plane having an inclination of θ = 13.2°. The block starts from rest at the top, and the length of the incline is 1.70 m. -> Find the acceleration of the block. (m/s2 down the incline) -> Find its speed when it reaches

*asked on October 2, 2016* -
## Chemistry

Solid aluminum carbonate decomposes to form solid aluminum oxide and carbon dioxide gas. Is Al2(CO3)3 ==> Al2O3 + CO2 the right equation? If so, how do you balance this equation?

*asked on March 1, 2010* -
## Math

The average weight of 3 boys is 53 pounds. Not one of these boys weighs less than 51 pounds. What is the maximum possible weight in pounds, of any one boy?

*asked on June 8, 2014* -
## Algebra

For how many two-digit prime numbers is the sum of its digits 8?

*asked on April 14, 2011* -
## calculus

Consider the function below. A(x) = x squt (x + 12) Find the local maximum value I tried to plug in f(-12) in to A(x) results = 0 but it aint correct

*asked on July 13, 2020* -
## math

write 480 in a) 1 significant figure b) 2 significant figures c) 3 significant figures d) 4 significant figures

*asked on August 23, 2010* -
## chemistry

Please help with this problem =) The combustion of liquid chloroethylene, C2H3Cl, yields carbon dioxide, steam, and hydrogen chloride gas. I. write a balanced equation for the reaction (I sorta get this part) II. How many moles of oxygen are required to

*asked on October 9, 2008* -
## Math

A pair of fair dice is rolled. Let E denote the event that the number landing uppermost on the first die is a 3, and let F denote the event that the sum of the numbers landing uppermost is 6. Determine whether E and F are independent events

*asked on August 15, 2010* -
## Math

Given that a and b are nonnegative real numbers such that a+2b=60, what is the largest possible value of ab? And If f(x) = x^2 - 3x + 4, find the value of f(sqrt3 - sqrt2). And The median of {20, x, 15, 30, 25} is 0.4 less than the mean. If x is a whole

*asked on July 6, 2017* -
## Chemistry

"Would you expect each of the following atoms to gain or lose electrons when forming ions? What ion [cation/anion] is most likely in each case?" Followed by a short list of elements such as Na and Sr. What I'm wondering is how I'm to know? I can't find

*asked on October 18, 2007* -
## Chemistry

Consider the combustion of ethane: 2C2H6(g)+7O2(g)-->4CO2(g)+6H2O(g) If the ethane is burning at the rate of 0.7 mol/L × s, at what rates are and being produced?

*asked on May 14, 2015* -
## mathmath

A study conducted by the Metro Housing Agency in a midwestern city revealed the information below concerning the age distribution of renters in the city. (Round your answers to four decimal places.) Age Adult Population, % Group Who Are Renters, % 21-44 53

*asked on October 15, 2010* -
## mathematics

I have a very important test (mathematics). I need help with quadratic equations and trapezoid calculator, I can't understand them and in my textbook is very very poorly explained. Can somebody give me a link for a tutorial or write something please?

*asked on July 27, 2020* -
## Math

Write an algebraic expression for the sum of 3 Coins and c Coins

*asked on October 25, 2017* -
## chemistry

2. What is the reduction half-reaction for the following unbalanced redox equation? Cr2O72– + NH4+ Cr2O3 + N2 A.) Cr2O3 -> Cr2O7^2– *B.) Cr2O72– -> Cr2O3 C.) NH4+ -> N2 D.) N2 -> NH4+ 3. Which oxidation-reduction reactions are best balanced by the

*asked on March 22, 2013* -
## EDTECH

UNIT 4 lesson 4 All of this information is part of a ___ in a database. a. record b. row c. column d. field What other information do you need to add to complete the database above? a. cell fill color b. fields c. field names d. borders

*asked on November 13, 2014* -
## math

which has greater volume? a) 1.0 kg of feathers or 1.0 kg of lead b) 100 g of gold or 100 g of water c) 1.0 L of copper or 1.0 L or mercury

*asked on August 23, 2010* -
## Chemistry

Calculate the enthalpy change for the reaction: Zn (s) + S (s) + 2 O2 (g) → ZnSO4 (s) ΔH = ? kJ by using the following data: Zn (s) + S (s) → ZnS (s) ΔH = –206.0 kJ ZnS (s) + 2 O2 (g) → ZnSO4 (s) ΔH = –776.8 kJ My answer is -982.8 but I'm not

*asked on January 30, 2020* -
## Chemistry

If the amount of mercury in a polluted lake is 0.4 µg Hg/mL, what is the total mass in kilograms of mercury in the lake? (The lake has a surface area of 100mi^2 and an average depth of 20 ft.) I'll probably be able to solve this once I know what it's

*asked on October 12, 2007* -
## social studies

What are some advantages and disadvantages of a reorganized family

*asked on February 11, 2015* -
## chem

For the indicated atom in each of the following molecules or ions, give the number and arrangement of the electron pairs around that atom. (a) As in AsO43- number: arrangement: linear bent trigonal planar square planar tetrahedral (b) Se in SeO42- number:

*asked on March 20, 2013* -
## College Algebra

Use the position equation given below, where s represents the height of the object (in feet), v0 represents the initial velocity of the object (in feet per second), s0 represents the initial height of the object (in feet), and t represents the time (in

*asked on July 9, 2013* -
## Algebra 1

A drama club wants to raise at least $500 in ticket sales for its annual show. The members of the club sold 50 tickets at a special rate of $5. The usual ticket price the day of the show is $7.50. At least how many tickets do they need to sell the day of

*asked on October 11, 2015* -
## physics

A student standing on the ground throws a ball straight up. The ball leaves the student's hand with a speed of 19.0m/s when the hand is 1.50m above the ground. How long is the ball in the air before it hits the ground? (The student moves her hand out of

*asked on September 26, 2014* -
## Math

How many tenths are there in 4/5?

*asked on September 21, 2014* -
## Physics

A ball is thrown horizontally from the top of a building. The ball is thrown with a horizontal speed of 8.2 ms^-1. The side of the building is vertical. At point P on the path of the ball, the ball is distance x from the building and is moving at an angle

*asked on September 2, 2019* -
## algebra

if log xy=6 and log x/y=2. solve for x and y

*asked on June 16, 2017* -
## physics

A 4.0 kg object is lifted 1.5 m. (a) how much work is done against the earth's gravity ? (b) repeat if the object is lowered insteadof lifted

*asked on March 19, 2012* -
## chem

At 20 degrees celsius the vapor pressure of dry ice is 56.5atm. If 10 g of dry ice (solid CO2) is placed in an evacuated 0.25 L chamber at a constant temperature of 20 degrees celsius, will all of the solid sublime? Is the answer no? I don't know if this

*asked on January 22, 2011* -
## physics

a student standing on the roof of a 50 meter high building kicks a stone at a horizontal speed of 4 meters per second, how much time is required for the stone to reach the level ground below?

*asked on January 16, 2011* -
## Chemistry

which has the highest lattice energy BaO or SrO

*asked on February 23, 2010* -
## math

You have to answer 2 essay questions for an exam. There are 8 essays to choose from. How many different groups of 2 essays could you possibly choose?

*asked on July 18, 2018* -
## Physics

The pupil of an eagle’s eye has a diameter of 6.0 mm. Two field mice are separated by 0.010 m. From a distance of 182 m, the eagle sees them as one unresolved object and dives toward them at a speed of 15 m/s. Assume that the eagle’s eye detects light

*asked on April 9, 2018* -
## Math

d+g/h for d =35, g = 19, and h=6

*asked on November 6, 2017* -
## trigonometry

the angle of elevation of a tower at place A south of it is 30degrees and at B west of A and a distance of 50 from it the angle of elevation is 18degrees, determined the height of the tower

*asked on June 5, 2017* -
## chemistry

A 15.0ml sample of NaCL solution has a mass of 15.78g.after the NaCL solution is evaporated to dryness, the dry salt residue has a mass of 3.26g. calculate the following concentrations for the %(m/m), % (m/v), molarity (M)

*asked on November 1, 2012* -
## math

A piano manufacturer has a daily fixed cost of $1200 and a marginal cost of $1500 per piano. Find the cost C(x) of manufacturing x pianos in onde day. Use your function to answer the following questions: a)On a given day, what is the cost of manufacturing

*asked on September 15, 2012* -
## Chemistry

In a reaction chamber, 3.0mol of aluminum is mixed with 5.3mol Cl2 and reacts. The reaction is described by the following balanced chemical equation. 2Al + 3Cl2 ==> 2AlCl3 a)Identify the limiting reagent for the reaction. b)Calculate the number of moles or

*asked on April 5, 2010* -
## phsics

throughout a time interval, while the speed of a particle increases as it moves along the x-axis, its velocity and acceleration might be: a) positive and negative B) negative and negative c) negative and positive D) negative and zero E) positive and zero

*asked on September 2, 2013* -
## chem

For the indicated atom in each of the following molecules or ions, give the number and arrangement of the electron pairs around that atom. (a) As in AsO43- number: arrangement: linear bent trigonal planar square planar tetrahedral (b) Se in SeO42- number:

*asked on March 19, 2013* -
## Physics

Once a 15 kg crate is in motion on a horizontal ﬂoor, a horizontal force of 51 N keeps the crate moving with a constant velocity. The acceleration of gravity is 9.81 m/s What is µk, the coeﬃcient of kinetic friction, between the crate and the ﬂoor?

*asked on October 25, 2011* -
## calculus

A trough is 16 ft long and its ends have the shape of isosceles triangles that are 5 ft across at the top and have a height of 1 ft. If the trough is being filled with water at a rate of 11 ft3/min, how fast is the water level rising when the water is 7

*asked on October 13, 2011* -
## chemistry

the molar mass of a newly synthesized jluorocarbon was measured in a gas microbalance, This device consists of a gkass bulb forming one end of a beam, the whole surrouned by a closed container. The beam is pivoted and the balance point is attained by

*asked on October 6, 2010* -
## Chemistry

Write and balance equations for the following reactions. A)Iron metal and Chlorine gas react to form solid iron(III) chloride. B)Solid aluminum carbonate decomposes to form solid aluminum oxide and carbon dioxide gas. C)Solid magnesium reacts with aqueous

*asked on February 28, 2010* -
## chemistry

Write Skeleton equations for these reactions. A) Heating Copper(II) sulfide in the Presence of diatomic oxygen produces pure copper and sulfur dioxide gas. B)When heated, baking soda (Sodium hydrogen carbonate) decomposes to form the products sodium

*asked on February 28, 2010* -
## math

I need some help. My teacher gave me a worksheet "Why does a poor man drink Coffee?" written by Pizzazz. Does anyone know how to do this sheet?

*asked on April 24, 2008* -
## Math(Physics)

How much energy is stored by the electric field between two square plates, 7.9 cm on a side, separated by a 2.5-mm air gap? The charges on the plates are equal and opposite and of magnitude 15 nC . Answer--> PE=_____ J PE = potential energy? I got this

*asked on April 25, 2017* -
## Algebra

Angle A is three times the measure of angle B. The sum of their measures is 128 degrees. Angle B is (x + 2) degrees. Find the value of x.

*asked on October 30, 2014* -
## Physics

A football is kicked at ground level with a speed of 17.9m/s at an angle of 39.0∘ to the horizontal. How much later does it hit the ground?

*asked on February 5, 2014* -
## physics

"A one meter board with uniform density, hangs in static equilibrium from a rope with tension T. A weight hangs from the left end of the board 0.2m away in distance. What is the mass of the board"

*asked on July 30, 2010* -
## Accounting

The cost principle requires that when assets are acquired, they be recorded at

*asked on April 12, 2010* -
## Business --- Kelley School in Indiana University

How is the undergraduate program at Kelley School of Management in Indiana University? Does it have a very good reputation among business fields? Thank you for using the Jiskha Homework Help Forum. Here is their website: http://kd.iu.edu/ Here is an

*asked on February 10, 2007* -
## math

when 0.0709 is rounded to the nearest thousandth, the result is A. 0.0709 B. 0.0701 C. 0.070 D. 0.071 is D correct?

*asked on July 23, 2018* -
## art

keeping facial features in proportion means

*asked on October 3, 2017* -
## trigonometry

the angle of elevation of the top of the tower from the foot of a flagpole is twice the angle of elevation of the top of the flagpole from the foot of the tower. at the point midway between the tower and the flagpole, the angles of elevation to their tops

*asked on June 17, 2017* -
## algebra

nestor has nickels, dimes, and quarters amounting to $1.85. if he has twice as many dimes as quarters, and the number of nickels is two less than twice the number of dimes, how many quarters does he have?

*asked on June 16, 2017* -
## CHEMISTRY

A 1.575 g sample of ethanedioic acid crystals, H2C2O4. xH20 was dissolved in water and made up to 250cm^3 . One mole of the acid reacts with two moles of NaOH. In a titration, 25.0 cm^3 of this solution of acid reacted with exactly 15.6 cm^3 of 0.160 mol/

*asked on July 9, 2016* -
## Calculus 2

A circular plate of radius r feet is submerged vertically in a tank of fluid that weighs w pounds per cubic foot. The center of the circle is k(k>r)feet below the surface of the fluid. Show that the fluid force on the surface of the plate is F=wk(πr^2).

*asked on January 18, 2013* -
## Chemistry

An experiment that led to the formation of the new field of organic chemistry involved the synthesis of urea, CN2H4O, by the controlled reaction of ammonia and carbon dioxide. 2 NH3(g) + CO2(g)= CN2H4O(s) + H2O(l) What is the theoretical yield of urea when

*asked on November 30, 2012* -
## Physics. PLEASE HELP!

two blocks of masses m1 and m2 (m1>m2) are placed on a frictionless table in contact with each other. A horizontal force of magnitude F is applied to the block of mass m1. if P is the magnitude of the contact force between the blocks, what are the net

*asked on October 11, 2012* -
## @elena

i noticed you helped a lot of people with their questions with physics ? can you hep me out please ? In putting, the force with which a golfer strikes a ball is planned so that the ball will stop within some small distance of the cup, say 2.00m long or

*asked on April 15, 2012* -
## chemistry

Consider the following unbalanced reaction: Fe2O3 (s) + CO (g) --> Fe (s) + CO2 (g) How many moles of carbon dioxide are produced per mole of iron (III) oxide reacted.

*asked on September 20, 2011* -
## chemistry

A flask has a mass of 78.23 g when empty and 593.63 g when filled with water. When the same flask is filled with concentrated sulfuric acid, H2SO4, its mass is 1026.57 g. What is the density of concentrated sulfuric acid? (Assume water has a density of

*asked on September 6, 2010* -
## physics

A ball is launched from ground level at 31.8 m/s at an angle of 35° above the horizontal. How far does it go before it is at ground level again? A) 14 m B) 21 m C) 43 m D) 86 m E) 97 m

*asked on June 10, 2010* -
## Chemistry

How many grams of K2SO4 would you need to prepare 1500 g of 5.0% K2SO4 (m/m) solution?

*asked on April 26, 2010* -
## Physics

In Young's experiment a mixture of orange light (611 nm) and blue light (471 nm) shines on the double slit. The centers of the first-order bright blue fringes lie at the outer edges of a screen that is located 0.452 m away from the slits. However, the

*asked on April 9, 2018* -
## Science

Which of the following body systems does the immune system rely on to provide the first line of defense against pathogens. A. Integumentary system B. Nervous system C. circulatory system D. endocrine system I think it is C

*asked on November 16, 2017* -
## Math

Which ratio forms a proportion with 18/30? A. 20/35 B. 50/90 C. 36/48 D. 60/100

*asked on November 13, 2017* -
## trigonometry

a triangle has sides equal to 68 cm, 77 cm and 75 cm, respectively. find the area of the escribed circle tangent to the shortest side of the triangle.

*asked on June 17, 2017* -
## math

Juan is cutting lumber into one half foot lenths.How many one half foot lengths will he get from an 8 foot long piece of lumber?

*asked on May 2, 2017* -
## algebra

Please show me how to put this number in scientific notation. 3.000052 Thank you.I appreciate your help.

*asked on December 14, 2016* -
## social studies

which four state capitals are located between 60 west and 70 west longitude

*asked on September 29, 2016* -
## science

Draw and label a diagram of a nitrogen atom. It should have 7 protons,7 neutrons, and 7 electrons

*asked on September 27, 2016* -
## Chemistry

The thiosulfate ion (S2O32-) is oxidized by iodine as follows: 2S2O32-(aq) + I2(aq) → S4O62-(aq) + 2I-(aq) In a certain experiment, 4.41×10-3 mol/L of S2O32- is consumed in the first 11.0 seconds of the reaction. Calculate the rate of production of

*asked on May 14, 2015* -
## Math

Eighty metres of fencing are available to enclose a rectangular area. What are the dimensions that enclose the max area. What is max area?

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

in a game a toy car slides down a slop if the top of the slope is 2 m higher than the foot of the slope how fast will the car be moving when it reaches the foot assume that all of its g.p.e is transformed to k.e (i'm 8th grade so simple answers pleas)

*asked on January 18, 2014* -
## Chemistry

1. Which of the following metals is oxidized by calcium ions? *potassium zinc iron lead 2. The first electrochemical cell was invented by ____. Michael Faraday *Alessandro Volta James Maxwell Benjamin Franklin 3. Why can't a lead storage battery be

*asked on March 28, 2013* -
## Chemistry

1. Hess's law _____. A.) makes it possible to calculate H for complicated chemical reactions B.) states that when you reverse a chemical equation, the sign of H does not change C.) determines the way a calorimeter works D.) describes the vaporization of

*asked on March 4, 2013* -
## statistics

A tobacco company claims that the nicotine content of its "light" cigarettes has a mean of milligrams and a standard deviation of milligrams. What is the probability that randomly selected light cigarettes from this company will have a total combined

*asked on December 11, 2012* -
## programming MIPS ask 3

Write a MIPS assembly language program for the following for loop: Pseudocode: int x; # for(x=10; x>0; x--){ # printf("x=%d", 4x); #} In the program use the slt or slti instruction and sll

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

the density of H2 gas in a rigid container is 0.117 g/L at 55 C. what is the pressure of hydrogen in the flask if it is heated to 125 C?

*asked on November 5, 2012* -
## math

The sum of two numbers is 10.The sum of their squares is 52.Find the numbers.

*asked on February 2, 2012* -
## Math

Find the equation of the diameter of the circle x^2+y^2-6x+2y=15, which, when produced, passes through the point (8,-2).

*asked on December 1, 2011* -
## physics

Two charges are located along the x-axis. One has a charge of 6.2 µC, and the second has a charge of −3.1 µC. The Coulomb constant is ke = 8.98755 × 10 9 N m2 /C 2 The acceleration of . gravity is 9.81 m/s 2 . If the electrical potential energy

*asked on April 11, 2011* -
## Math

If line g passes through point (2, 2) and is perpendicular to the line h, then what is the equation of line g? With h passing through two points (1, 2) and (3, 6)

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

The pH of a solution that contains 0.818 M acetic acid (Ka = 1.76 x 10-5) and 0.172 M sodium acetate is __________. The Ka of acetic acid is 1.76 × 10-5.

*asked on November 23, 2010* -
## Chemistry

Complete and balance this equation for a combination reaction. Be + O2 ==> Would it be Be + O2 ==> BeO2 ? or... 2Be + O2 ==> 2BeO ? Why??

*asked on March 14, 2010* -
## Physics

An object traveling at 5.0 m/s East has a mass of 6.0 kg. What is the magnitude of the object's momentum? I am not sure what the formula is for this one!

*asked on October 11, 2009* -
## science

CHOOSE ANY DISNEY MOVIE TO MAKE THIS DIORAMA. MAKE A 3D MODEL OF PLAINS, PLATEAU AND MOUNTAINS AND WRITE 5 PARAGRAPHS ABOUT THESE THREE LANDFORMS. PLEASE HELP ME. THANK YOU.

*asked on September 23, 2008* -
## algebra

THe length of a rectangle is twice the width. The area is 200yd^2. What is the length and width. Is this right L=20 w=10

*asked on May 11, 2008* -
## government

If the issue that colonists would have coming out of the Articles of Confederation, what impact whould the Articles of Confederation, what impact whould those issues have on the designing of the constitution? If the issue that colonists would have coming

*asked on October 17, 2006* -
## Math

x^2+9x+20=0 Solve using quadratic formula

*asked on April 9, 2020* -
## math

Fiona is repairing the wiring on a radio broadcast tower. She is in the basket of the repair truck 40m from the tower. if she looks up at an angle of 42° she can see the top of the tower. She can see the base if she looks down at an angle of 32°. How

*asked on June 13, 2018* -
## stast

suppose the alternative hypothesis in a hypothesis test is "the population mean is less than 60" if the sample size is 50 and alpha =.05, the critical value of the z is?

*asked on December 2, 2017*