# Albert

Most popular questions and responses by Albert-
## Chemistry

when 25.0 mL of a solution containing both Fe2+ and Fe3+ ions is titrated with 23.0 mL of 0.0200 M KMnO4 (in dilute sulfuric acid). As a result, all of the Fe2+ ions are oxidized to Fe3+ ions. Next, the solution is treated with Zn metal to convert all of

*asked on December 15, 2011* -
## Physics Help!

A skier wants to build a rope tow to pull herself up a ski hill that is inclined at 15 with the horizontal. Calculate the tension needed in the rope to give the skier's 54kg body a 1.2 m/s^2 acceleration.

*asked on January 4, 2018* -
## Chemistry

How do you differentiate between fluorene and acetanilide? Suggest procedures and steps involved other than melting point and chromatography.

*asked on April 1, 2013* -
## physics

Suppose the straight-line distance between New York and San Francisco is 4.4 106 m (neglecting the curvature of the earth). A UFO is flying between these two cities at a speed of 0.69c relative to the earth. What do the voyagers aboard the UFO measure for

*asked on July 8, 2013* -
## Chemistry

How do you distinguish between fluorene and acetanilide? Suggest methods other than melting point and chromatography.

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

9. which set of output values correctly completes the function table? y=6-x input (X) output (y) -2 ? -1 ? 3 ? ----------------------- 4,5,3 -8,-7,3 8,7,3 11. What is the function rule shown by the table? input(x) output(y) -2 -3 0 1 1 3 2 5

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

which values can be substituted for x to make the inequality x - 4 >0 true? choose all that apply A. 0 B. 3 C. 4 D. 18 my answer is 0 and 4 please check my answer's

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

Evans Technology has the following capital structure. Debt ............................................ 40% Common equity .......................... 60 The aftertax cost of debt is 6 percent, and the cost of common equity (in the form of retained earnings)

*asked on November 16, 2015* -
## physics

a turntable rotates about a fixed axis, making one revolution in 10s . the moment of inertia of the turntable about it's axis is 1200kg/m^2 . a man of mass 80kg , initially standing at the center of the turntable, runs out along a radius. what is the

*asked on October 17, 2014* -
## Life orientation

Critically discuss six ways in which individual,groups and broader of South African community can be influenced by humans rights violations

*asked on April 27, 2019* -
## Chemistry

The reaction NO2(g) + NO2(g) → N2O4(g) is second order with a rate constant of 0.044 /M·s at a particular temperature and pressure. If the initial concentration of NO2(g) is 0.100 M, what is the concentration of NO2 after 20 minutes?

*asked on February 27, 2018* -
## Chemistry

What should the molar concentrations of benzoic acid and sodium benzoate be in a solution that is buffered at a pH of 4.75 and has a freezing point of -2.0 ∘C? (Assume complete dissociation of sodium benzoate and a density of 1.01 g/mL for the solution.)

*asked on March 29, 2017* -
## science

find the gravitational force exerted by the sun on a 70 kg man located at the earth's equator a)at noon when the man is closest to the sun. b)at midnight when he is futherst from the sun. c)calculate the diferrence in gravitational acceleration due to the

*asked on January 21, 2016* -
## Chemistry

Please help me set up these problems. I have been staring at them for hours and I can't tell where I went wrong. Question: Consider the following reaction: CaCO3(s)→CaO(s)+CO2(g). Estimate ΔG∘ for this reaction at each of the following temperatures.

*asked on November 16, 2014* -
## Mathmeta

How to select logical numbers for mark six?

*asked on June 10, 2019* -
## math

if the interest rate is 8.25% and you borrowed $5000 for 30 days. How much interest would you pay

*asked on May 19, 2019* -
## Chemistry

To what decimal place should each answer be rounded? and how many significant figures does the rounded answer have? a) 9cm + 2.8 cm= 11.8cm (unrounded) b) 0.135 atm + 0.6 atm= 0.735 atm (unrounded) PLEASE HELP

*asked on September 11, 2015* -
## Physics

A train accelerates from the rest at the station A at a rate of 0.8 m/s2 for 25 s, the travels at constant velocity for 77.5 s before it comes to rest at the station B after period of retardation lasting 20 s. What is the distance between stations A and B,

*asked on April 14, 2015* -
## RIGHT TRIANGLE TRIG

a kite is being flown 150 yards of string. the kite has an angle of elevation with the ground 65 degrees. how high above the ground is the kite. I DON'T KNOW HOW TO SET UP THE PROBLEM

*asked on November 4, 2014* -
## Physics

A block initially at rest, slides down from the top of an inclined plane 30degrees above the horizontal. The plane is 100feet long and frictionless. what distance will it travel on a frictionless horizontal surface at the foot of the plane 6seconds after

*asked on January 12, 2015* -
## trigonometry

from a point 3 m above the water surface, the angle of elevation of the top of a certain tree is 30°40', while the angle of depression of its image is 65°10'. Find the height of the tree and its distance from the point of observation.

*asked on December 7, 2015* -
## THEORY OF INTEREST

Suppose that a money market fund pays a nominal rate of interest of 8.7 percent convertible monthly. What is the equivalent nominal rate convertible quarterly?

*asked on September 30, 2014* -
## college physics

calculate the specific heat of 200g of substance whose temperature is 30 degree celcius if it is mixed with 200g of water heated in a 300g iron container at 100 degree celcius. the final temperature of the mixture is 98 degree celcius.

*asked on February 14, 2012* -
## Math

k such that 3 is the remainder when f(x)=x to the 4 power minus 4xcube minus 8xsquare minus 7x plus 1. Tapos which of the following binomial factor of 2xcube plus 5xsquared minus 10x plus 16.

*asked on October 1, 2017* -
## stat

Forty-nine items are randomly selected from a population of 500 items. The sample mean is 40 and the sample standard deviation 9. Develop a 99% confidence interval for the population mean

*asked on December 7, 2015* -
## Physics

The free-fall acceleration on Mars is 3.7 m/s2. (a) What length pendulum has a period of 4 s on the earth? cm What length pendulum would have a 4 s period on Mars? cm (b) A mass is suspended from a spring with force constant 10 N/m. Find the mass suspended

*asked on December 5, 2010* -
## Chem

To what decimal place should each answer be rounded? and how many significant figures does the rounded answer have? a) 9cm + 2.8 cm= 11.8cm (unrounded) b) 0.135 atm + 0.6 atm= 0.735 atm (unrounded) can you show me how to do this?

*asked on September 10, 2015* -
## TRIG WORD PROBLEMS

from 25 feet away from the base of a building, the angle of elevation from the ground to the top of a building is measured 38 degrees. how tall is the building. WHat i did was put 25 feet on the base of the triangle the angle measurement oppsite and the

*asked on November 4, 2014* -
## maths

Choose the THREE options that define sequences that do not converge. Options A P0 = 40, Pn+1 − Pn = 2.8 Pn (1− Pn/300) (n = 0,1,2, . . .) B P0 = 100, Pn+1 − Pn = 0.7Pn (1− Pn/480) (n = 0,1,2, . . .) C P0 = 250, Pn+1 − Pn = 2.4Pn (1− Pn/420) (n

*asked on May 14, 2011* -
## Physics

A skier wants to build a rope tow to pull herself up a ski hill that is inclined at 15 with the horizontal. Calculate the tension needed in the rope to give the skier's 54kg body a 1.2 m/s^2 acceleration.

*asked on January 4, 2018* -
## maths

The variation in size from year to year of a particular population can be modelled by an exponential model with annual proportionate growth rate 0.1246. The size of the population at the start of the initial year is 360. Choose the TWO options that give,

*asked on May 11, 2011* -
## maths

Choose the option that gives an expression for the indefinite integral ʃ (cos(4x) + 2x^2)(sin(4x) − x) dx. In each option, c is an arbitrary constant. Options A cos(4x) + 2x^2 +c B -1/8cos(4x) + 2x^2)^2 +c C 1/4 (sin(4x) − x)^2 + c D (1/(2 (sin(4x)

*asked on May 11, 2011* -
## Physical Science

If the density of ice is 0.92 g/cm^3, what percent of an ice cube’s (or iceberg’s) mass is above water.

*asked on April 15, 2009* -
## Math

When you solve the system shown by the elimination method, which statement is true? y + 3x = 10 −y − 3x = 10 A. You eliminate y; the sum of the coefficients of y is zero. Then, you can solve for x. B. There is no solution; x and y are eliminated and

*asked on January 5, 2016* -
## algebra

A man and a woman's ages total 98. He is twice as old as she was when he was her age now. What are their ages?

*asked on February 7, 2014* -
## college physics

calculate the specific heat of 200g of substance whose temperature is 30 degree celcius if it is mixed with 200g of water heated in a 300g iron container at 100 degree celcius. the final temperature of the mixture is 98 degree celcius.

*asked on February 14, 2012* -
## maths

The variation in size from year to year of a particular population can be modelled by an exponential model with annual proportionate growth rate 0.1246. The size of the population at the start of the initial year is 360. Choose the TWO options that give,

*asked on May 12, 2011* -
## maths

The method for completing the square can be used to write the expression −2x^2 + 12x−5 in the form a(x + b)^2 + c, where a, b and c are constants. Choose the option that gives the value of c. Options A −23 B −13 2 C 5 2 D 3 E 13 F 14

*asked on May 11, 2011* -
## maths

The mean weight of the contents of samples of 30 bags of sugar has standard error 0.008kg. Choose the option that is closest to the probability, to three decimal places, that the mean weight of the contents of samples of 30 bags of sugar will be 1kg or

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

A very large book has pages numbered from 1 to 11521. How many times is the digit 3 printed?

*asked on September 21, 2016* -
## Chemistry

I'm doing a redox potential/lead acid cell experiment and one of the questions that were asked was: -What were the identities of the gases you saw being produced at the + and - electrodes during the cell conditioning process? We used H2SO4 How do I go

*asked on December 3, 2014* -
## maths

f(x)=ln(e^x-e^-x), x>0 By applying in turn the Composite and Quotient Rules, find derivative and second derivative. Thanks.

*asked on May 14, 2011* -
## maths

The variation in size from year to year of a particular population can be modelled by an exponential model with annual proportionate growth rate 0.1246. The size of the population at the start of the initial year is 360. Choose the TWO options that give,

*asked on May 12, 2011* -
## maths

By first applying the Product Rule, choose the option that gives (correct to two decimal places) the overall maximum value of the function f(x) = e^3x cos(2x) on the interval [1/12 π, 1/4π]. Options A 0.49 B 1.90 C 2.19 D 2.42 E 3.97 F 5.88 G 7.46 H

*asked on May 11, 2011* -
## maths

Choose the option that gives (correct to two decimal places) the area of the region which is bounded by the x-axis and by the graph of y =(20(7 − x)(x − 3))/x^2 . Options A 0.47 B 1.31 C 2.09 D 3.76 E 5.12 F 6.55 G 8.20 H 9.46

*asked on May 11, 2011* -
## statistics

The heights in centimetres of men in a sample selected at random may be modelled by a normal distribution with mean 180.5 and standard deviation 11.3. 1. Choose the option that is closest to the value above which 30% of the heights of men will lie. Options

*asked on May 9, 2011* -
## Physics

A man enters a tall tower, needing to know its height. He notes that a long pendulum extends from the ceiling almost to the floor and that its period is 28.0 s. (a) How tall is the tower? m (b) If this pendulum is taken to the Moon, where the free-fall

*asked on December 5, 2010* -
## 2nd grade math

what is mental math and how does it work. the question is use mental math to find the missing numbers. look for the pattern in each chart.the chart ooks like eight boxes two rows of four, the filled in is 0,1,2,3,4the second row is empty, the second

*asked on August 27, 2007* -
## Physics

g=4 pi (l/t square)

*asked on July 21, 2017* -
## Math

Solve the system using substitution. 6x + y = 12 4x + 6y = −8 A. (2 1/2,3) B. (−2 1/2,−3) C. (2 1/2,−3) D. no solution I GOT B!

*asked on January 5, 2016* -
## theory of interest

1.Two investments are made at the same time. The first consists of investing 1550 dollars at a nominal rate of interest of 7.9 percent convertible semiannually. The second consists of investing 1450 dollars at a nominal rate of interest of 7.9 percent

*asked on October 25, 2014* -
## English Analysis

Reading The Stranger by the lovely Albert Camus. Just need help understanding this question: -After I listed some themes I explored, my teacher asks: "Given the themes you listed, are any conventions questioned based on the treatment of a given theme?

*asked on October 9, 2012* -
## Calculus grade 12

find dy/dx by implicit differentiation a) xy + x^5y^2 + 3x^3 - 4 = 1 b) lny = cos x thank you

*asked on June 21, 2012* -
## maths

f(x)=ln(e^x-e^-x), x>0 By applying in turn the Composite and Quotient Rules, find derivative and second derivative.

*asked on May 15, 2011* -
## maths

The mean weight (1.0042kg)of the contents of samples of 30 bags of sugar has standard error 0.008kg. Choose the option that is closest to the probability, to three decimal places, that the mean weight of the contents of samples of 30 bags of sugar will be

*asked on May 14, 2011* -
## maths

A sequence is defined by un = 2×(−0.5)n + 3 (n = 1,2,3, . . .). Choose the option that best describes the long-term behaviour of the sequence. Options A un becomes arbitrarily small (that is, un → 0 as n→∞). B un becomes arbitrarily large and

*asked on May 11, 2011* -
## maths

Choose the option that gives the solution of the initial-value problem dy dx=(1 + 2 cos2x^2)/y (y > 0), y= 1 when x = 0. Options A y = 1+ 2sin^2 x B y = (1 + 2 sin x)^2 C y = (4x + cos(2x))^2 D y = 4x + cos^2 x E y =sqrt(4x + cos(2x) F y =sqrt(1 + 4x +

*asked on May 11, 2011* -
## maths

The mean weight of the contents of samples of 30 bags of sugar has standard error 0.008kg. Choose the option that is closest to the probability, to three decimal places, that the mean weight of the contents of samples of 30 bags of sugar will be 1kg or

*asked on May 11, 2011* -
## maths

The mean weight of the contents of samples of 30 bags of sugar has standard error 0.008kg. Choose the option that is closest to the probability, to three decimal places, that the mean weight of the contents of samples of 30 bags of sugar will be 1kg or

*asked on May 10, 2011* -
## Math (calculus 3)

A football is thrown down the field by a quarterback from a height of 1 foot with an initial velocity of 40 feet per second at angle of pi/6 radians. If a receiver catches the ball downfield at a height of 1 foot above ground; a) How long was the ball in

*asked on September 28, 2016* -
## physics

Phisic

*asked on November 6, 2014* -
## Chemistry Physics

How many grams of water at 20°C are necessary to change 800g of water at 90°C to 50°C?

*asked on November 5, 2014* -
## ACT Math

Carlos goes to a local deli for lunch and orders a sandwich. He needs to choose a bread, a meat, a vegetable, a cheese and a source. How many sandwich combinations are possible? Assume Carlos always pick only one item from each category. Bread: Italian,

*asked on November 13, 2012* -
## Implicit differentiation calculus

PLEASE HELP , I DON'T UNDERSTAND find dy/dx by implicit differentiation a) xy + x^5y^2 + 3x^3 - 4 = 1 b) lny = cos x thank you

*asked on June 21, 2012* -
## maths

The variation in a population is modelled by the recurrence relation (Jn+1 0.9257 0.0208) (Jn) + (0.014) (An+1 0.0661 0.9767) (An) (0.056) where Jn and An are the sizes, in millions, of the subpopulations of juveniles and adults, respectively, n years

*asked on May 15, 2011* -
## maths

*asked on May 14, 2011* -
## maths

*asked on May 13, 2011* -
## math

The ticket prices for a movie are shown in the illustration. Receipts for one showing were $1,930 for an audience of 205 people. How many general admission tickets and how many senior citizen tickets were sold?

*asked on May 22, 2017* -
## trigonometry

can someone help me prove the identities on this: 1- 1/2 sin2θ = sin^3θ + cos^3θ / sinθ + cosθ

*asked on January 21, 2016* -
## trigonometry

sina^2θcos^2θ= 1/8 (1-cos4θ)

*asked on January 21, 2016* -
## Math

Solve the system using substitution. x = y − 6 y = 6 − 3x A. (0, 6) B. (6, 0) C. (0, −6) D. (−6, 0)

*asked on January 5, 2016* -
## Math

Solve the system using substitution. y = 4x − 5 y = 2x + 1 A. (−2, −3) B. (1, 3) C. (−2, −13) D. (3, 7)

*asked on January 5, 2016* -
## Calculus grade 12

find the slope of the tangent line to y^4 = 3x^2 - 2x at the point (1,1)

*asked on June 21, 2012* -
## math

$24 lft a 15 percent tip how much total

*asked on May 14, 2012* -
## trig

1.Ifg(x)=cos4x,find g'(pie/24). 2.Differentiate y=csc^2 pie*x

*asked on February 25, 2012* -
## maths

The mean weight (1.0042kg)of the contents of samples of 30 bags of sugar has standard error 0.008kg. Choose the option that is closest to the probability, to three decimal places, that the mean weight of the contents of samples of 30 bags of sugar will be

*asked on May 17, 2011* -
## maths

The variation in a population is modelled by the recurrence relation (Jn+1 0.9257 0.0208) (Jn) + (0.014) (An+1 0.0661 0.9767) (An) (0.056) where Jn and An are the sizes, in millions, of the subpopulations of juveniles and adults, respectively, n years

*asked on May 17, 2011* -
## maths

The variation in a population is modelled by the recurrence relation (Jn+1 0.9257 0.0208) (Jn) + (0.014) (An+1 0.0661 0.9767) (An) (0.056) where Jn and An are the sizes, in millions, of the subpopulations of juveniles and adults, respectively, n years

*asked on May 16, 2011* -
## maths

Choose the THREE options that define sequences that do not converge. Options A P0 = 40, Pn+1 − Pn = 2.8 Pn (1− Pn/300) (n = 0,1,2, . . .) B P0 = 100, Pn+1 − Pn = 0.7Pn (1− Pn/480) (n = 0,1,2, . . .) C P0 = 250, Pn+1 − Pn = 2.4Pn (1− Pn/420) (n

*asked on May 16, 2011* -
## maths

The mean weight (1.0042kg)of the contents of samples of 30 bags of sugar has standard error 0.008kg. Choose the option that is closest to the probability, to three decimal places, that the mean weight of the contents of samples of 30 bags of sugar will be

*asked on May 16, 2011* -
## maths

Choose the THREE options that define sequences that do not converge. Options A P0 = 40, Pn+1 − Pn = 2.8 Pn (1− Pn/300) (n = 0,1,2, . . .) B P0 = 100, Pn+1 − Pn = 0.7Pn (1− Pn/480) (n = 0,1,2, . . .) C P0 = 250, Pn+1 − Pn = 2.4Pn (1− Pn/420) (n

*asked on May 15, 2011* -
## maths

*asked on May 14, 2011* -
## maths

*asked on May 14, 2011* -
## maths

*asked on May 14, 2011* -
## maths

*asked on May 13, 2011* -
## maths

A sequence is defined by un = 2×(−0.5)n + 3 (n = 1,2,3, . . .). Choose the option that best describes the long-term behaviour of the sequence. Options A un becomes arbitrarily small (that is, un → 0 as n→∞). B un becomes arbitrarily large and

*asked on May 12, 2011* -
## maths

A ship travels at a constant speed of 25 kilometers per hour (kph) in a straight line from port A located at position (xA, yA) = (−100,−100) to port B at (xB, yB) = (300, 100). (a) (i) Find the equation of the line of travel of the ship. (ii) Find the

*asked on May 9, 2011* -
## physics

how fast will a object be traveling when drppped from 30 feet high

*asked on April 4, 2011* -
## math163

Please i need all the process.. thank you.. for the polynomial, list each real zero and its multiplicity. determine whether the graph crosses or touches the x-axis at each x-intercept. f(x)=1/2x^4(x^2-5)(x+1)

*asked on March 1, 2011* -
## math-163

for the polynomial, list each real zero and its multiplicity. determine whether the graph crosses or touches the x-axis at each x-intercept. f(x)=1/2x^4(x^2-5)(x+1)

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

A HOT CUP OF COFFEE HAS SOME SUGAR COMLETELY DISSOLVED IN IT. AFTER THE COFFEE HAS COOLED, SOME SUGAR APPEARS AT THE BOTTOM OF THE CUP. EXPLSIN WHAT HAS HAPPENED IN TERMS OF SATURATION.

*asked on February 24, 2011* -
## statistics

3 different drugs are under consideration for trating a given ailment. in the past 10,000 applications, drug A was sed 2500 times, drug B 4000 times, and drug C 3500 times. when an expert was asked to rank the effectiveness of the 3 drugs, he replied:

*asked on November 12, 2009* -
## math 5th grade

i need all the prime numbers of 1-100

*asked on November 14, 2008* -
## science

how does the mantle material get energy to move in convection currents?

*asked on November 14, 2008* -
## PhYsIcS

A 5 meter, 100 N/m spring is at a 30 degree angle to the horizontal. If a 10 kg weight is placed on the spring when it is compressed 2 meters, how high will it travel?

*asked on November 2, 2008* -
## PRE calculus

Find the area between each curve and the x-axis for the given interval. y=6x^2+5 from x=0 to x=5 I'm just starting to learn about this and am very confused. Can someone show me how to do this. Thanks. I need help.

*asked on May 14, 2008* -
## Specialist Mathematics

Need help with three proofs. Proof#1: Prove that |x+y| is less than or equal to |x|+|y| Proof#2: Prove that |x|-|y| is less than or equal to |x-y| Proof#3: Prove that |x+y+z| is less than or equal to |x|+|y|+|z|.

*asked on December 22, 2016* -
## Physics

Hello, I need some help with this physics problem. This was the only one I couldn't solve, and the teacher wouldn't help me because she wanted me to figure it out for myself, just like everyone else tried. (Although no one did) Here is the question: Type

*asked on November 1, 2016* -
## Math

A wheel makes6 1/12 revolution per minute. If it rotates 45 minutes,how many revolutions does it make

*asked on April 9, 2016* -
## math

convert 40.0m^3 to liters. note that 1mL = 1cm^3. can you show me how to do this problem?

*asked on September 10, 2015*

## Pages

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