Questions Asked on
April 15, 2017

Chemistry
lead(II)nitrate reacts with oxygen gas to produce diphosphorous pentoxide
asked by Chelo 
Physics
you lift a chair that weighs 50 n to a height of 0.5cm and carry it 10 m across the room how much work do you do on the chair. I just want to make sure is it 25J because you are only doing work if you are lifting it but walking with it isn't work because
asked by Hamza 
Chemistry
lead (II) nitrate reacts with oxygen gas to produce diphosphoroous pentoxide
asked by Chelo 
pre calc
solve the given equation cos(θ) − sin(θ) = 1
asked by Samantha 
Physics
you lift a chair that weighs 50 n to a height of 0.5cm and carry it 10 m across the room how much work do you do on the chair. I just want to make sure is it 25J because you are only doing work if you are lifting it but walking with it isn't work because
asked by Hamza 
Wayne C C C
How much work does a 55kg person do against gravity in walking up a trail that gains 720 m in elevation?
asked by Ameena 
calculus
Find the exact length of the curve. x=(y^4)/8+1/(4y^2), 1 ≤ y ≤ 2.
asked by alex 
chemistry
zinc hyrdoxide + phosphoric acid > zinc phosphate + water
asked by Chelo 
Physics
you lift a chair that weighs 50 n to a height of 0.5cm and carry it 10 m across the room how much work do you do on the chair. I just want to make sure is it 25J because you are only doing work if you are lifting it but walking with it isn't work because
asked by Hamza 
Oob
an object moves from point p to q with an average speed of 60m/s and comes back from point q to p with an average speed of 144km/h . what is the average speed of whole journey in m/s?
asked by Mmm!m 
principles of economics
When the price of paper increases from $250 to $256 per ton, the quantity supplied increases from 250 to 270 tons per day. The price elasticity of supply is nothing . (Enter your response rounded to two decimal places.)
asked by blue smith 
math
p varies directly as the square of q and inversely as r when p=36, q=3 and r=4 calculate q when p=200 and r=2
asked by favour 
Maths
How long will it take for R 200000 to grow to R240000 if the interest rate is 6% per year in interest compounded every 3 months?.
asked by Anza 
Reading
What does an open ended question look like?
asked by Katelyn 
English
Open ended question examples?
asked by Katelyn 
Social Studies HELP
11. How does the climate of Southeast Asia vary among regions? a. the mainland is much hotter than the islands b. the mainland receives monsoons but the islands so not c. the islands are generally wetter than the mainland**** d. the islands have a
asked by Rose 
chemistry
what's the difference between experimental estimate of sugar concentration and the true sugar concentration?
asked by Tabitha 
algebra
A car is moving at the rate of 80km/h. the diameter of its wheel is 60cm. a, find the number of revolutions per minute that the wheels are rotating. b, find the angular speed of the wheels in radians per second.
asked by Ms Kay 
Pre calc
Solve the given equation cos(θ) − sin(θ) = 1 I got the answer to be 3pie/2 and 0 but its wrong can someone help Thank you
asked by Samantha 
Linear algebra
please help :( Bob and Doug play a lot of PingPong, but Doug is a much better player, and wins 90% of their games. To make up for this, if Doug wins a game he will spot Bob five points in their next game. If Doug wins again he will spot Bob ten points the
asked by shana 
value
5/8 the number of boys in a school.if there are 240 girls.find the number of boys?
asked by value 
Physics PLEASE HELP
Ernest Rutherford (the first New Zealander to be awarded the Nobel Prize in Chemistry) demonstrated that nuclei were very small and dense by scattering helium4 nuclei (4He) from gold197 nuclei (197Au). The energy of the incoming helium nucleus was 7.58
asked by Haya 
Physics
In an elastic collision, a 300 kg bumper car collides directly from behind with a second, identical bumper car that is traveling in the same direction. The initial speed of the leading bumper car is 4.90 m/s and that of the trailing car is 6.20 m/s.
asked by Haya 
Physics
An alpha particle (4He) undergoes an elastic collision with a stationary protactinium nucleus (231Pa). What percent of the kinetic energy of the alpha particle is transferred to the protactinium nucleus? Assume the collision is onedimensional.
asked by Haya 
Physics
Water flows into one end of a horizontal, cylindrical pipe at 2.0 m/s. The pipe then narrows until its diameter at the opposite end is only 1/3 of that at the beginning. (a) What is the flow speed at the narrow end of the pipe? (b) What is the pressure
asked by Alex 
Physics
Suppose that you place a square block of wood with dimensions 12.0 cm x 12.0 cm x 6.0 cm into some water as shown below. The wood has a density of 600 kg/m3. What is the distance from the bottom horizontal face of the block to the surface of the water? (In
asked by Alex 
math
How write an equivalent expression to the expression (17*93) / (17*97)
asked by Yoanna 
chemistry
Calculate the concentration of Ca+2 in a saturated solution of Ca(OH)2 if the Ksp = 6.5x106 at 25oC. can someone explain the steps to do this please? :)
asked by Jae M. 
Math
To study the efficiency of its new pricescanning equipment, a local supermarket monitored the amount of time its customers had to wait in line. The frequency distribution in the following table summarizes the findings. Find the standard deviation of the
asked by Alyssa 
algebra PLEASE help
Bob and Doug play a lot of PingPong, but Doug is a much better player, and wins 90% of their games. To make up for this, if Doug wins a game he will spot Bob five points in their next game. If Doug wins again he will spot Bob ten points the next game, and
asked by shana 
math
The area of the rectangle with length (x + 9) inches and width 6 inches is more than 72 square inches. Which inequality can be used to find x?
asked by kool 
math
integral of ((1+sin(2x))^0.5)/(sin(x)^2) I tried all kind of substitution, simplification but unable to solve it.Need a hint only no solution please.
asked by Sam 
Math
A cyclist won a bicycle race for seven consecutive years. His "winning" times and "victory" margins (time difference of the second place finisher) are given in the figure below. YearTimeMargin (h:m:s) (m:s)
asked by Kielyn 
Physics
2) Two point charges, Q1 = 5.00 nC and Q2 = 3.00 nC, are separated by 35.0 cm. (a) What is the potential energy of the pair? What is the significance of the algebraic sign of your answer? (b) What is the electric potential at a point midway between the
asked by AHMED AYMAN 
Computer program and design
Design a class called SimpleCalculator using psudoecode that contains public methods named add(), subtract(). Each of the methods accepts two numeric arguments and returns a number that represents the result of the appropriate arithmetic operation. Design
asked by Kimberly 
Caclulus
A particle is moving as given by the data below 4sin(t)3cos(t); s(0)=0
asked by Bob 
Caclulu
consider the function f(x) = 9/x^3 10/x^7 let F(x) be the antiderivatice of f(x) with F(1)=0 then F(x)=
asked by Bob 
Math
If you flip three fair coins, what is the probability that you'll get a head on the first flip, a tail on the second flip, and another head on the third flip?
asked by Ann 
Math
Triangle LMN is similar to Triangle XYZ The scale factor of triangle LMN to Triangle XYZ is 2:5 what is the length of the zx
asked by Olivia 
Mathematics
A mother is 33 years older than her twin children. In 3 years her age will be twice the combined ages of the twins. How old are the twins now?
asked by Katniss Everdeen 
Chemistry
Calculate ΔG° for each of the reactions below in kJ. (a) Sn(s) and Pb2+(aq) (b) Cr(s) and Cu2+(aq)
asked by Jason 
MathematicsAlgebra PLEASE HELP,PLEASE!!!!!!!
In a twodigit number, the tens’ digit is 1 less than the units’ digit. If the digits are interchanged, the sum of the number obtained and the original number is 143. Find the number.
asked by Kittyforevees 
Calculus
Consider the equation xy2 − x2y = 6. (a) Find all points on the graph when x = 2. (b) Find a formula for dy dx in terms of x and y. (c) Find the tangent lines for the points you found in the ﬁrst part
asked by Bob 
Mathematics PLEASE HELPPPPPPPPPP!!!!!
In a twodigit number the tens’ digit is 3 more than the units’ digit. The number itself is 17 times the units’ digit. Find the number.
asked by Katniss Everdeen 
Math PLEASE HELP!!!!!!!!!!!!!!!
A biker traveling at his usual speed can go from his house to work in 4 hours. When the weather is bad, he travels 6 miles per hour slower, and it takes him half an hour more. How far is his work from his house?
asked by Katniss Everdeen 
Physics
A uniform rod of length L and mass M is held vertically with one end resting on the floor as shown below. When the rod is released, it rotates around its lower end until it hits the floor. Assuming the lower end of the rod does not slip, what is the linear
asked by Haya 
Physics
A 9 kg block on a frictionless inclined plane at 40° has a cord attached to a pulley of mass 4 kg and radius 11 cm (see the following figure). (a) What is the acceleration of the block down the plane (in m/s2)? (Enter the magnitude.) (b) What is the work
asked by Haya 
Physics
You have a grindstone (a disk) that is 92.0 kg, has a 0.490m radius, and is turning at 83.0 rpm, and you press a steel axe against it with a radial force of 25.0 N. (a) Assuming the kinetic coefficient of friction between steel and stone is 0.50,
asked by Haya 
Physics
A horizontal beam of length 4 m and mass 7.0 kg has a mass of 2.0 kg and width 0.8 m sitting at the end of the beam (see the following figure). What is the torque due to gravity (in N · m) on the beam–block system about the support at the wall? (Enter
asked by Haya 
Physics
A uniform rod of mass 2.0 kg and length 8.4 m is free to rotate about one end (see the following figure). If the rod is released from rest at an angle of 60° with respect to the horizontal, what is the speed (in m/s) of the tip of the rod as it passes the
asked by Haya 
Physics
A wheel has a constant angular acceleration of 2.5 rad/s2. Starting from rest, it turns through 200 rad. (a) What is its final angular velocity (in rad/s)? (Enter the magnitude.) (b) How much time elapses (in s) while it turns through the 200 radians?
asked by Haya 
math
if m
asked by lady d 
Statistics
Suppose you are told that a 95% confidence interval for the average price of a gallon of regular gasoline in your state is from $2.85 to $3.84. Use the fact that the confidence interval for the mean is in the form x − E to x + E to compute the sample
asked by Alice 
Trignometry
In Philadelphia the number of hours of daylight on day t (t is the number of days after january 1) is modeled by the function L(t)= 12+2.83sin((2*Pi)/365(t800) a. Which day have about 10 hours of daylight? b. How many days of the year have more than 10
asked by SAM 
Statistics
Suppose x is a uniform random variable with values ranging from 40 to 60. Find the probability that a randomly selected observation exceeds 54.
asked by Kamal 
algebra
Find a formula in terms of k for the entries of A^k, where A is the diagonalizable matrix below. A= 5 16 2 7
asked by Mei 
English
Write the derivative. _____with other people's problem is a sign of kindness. (empathy) Choices: Empathy, Empathize, Empathetic, or Empathizing. answer: Empathizing
asked by Kimmy 
math
Suppose x can be expressed as a function of y by x = 5x − 3. a. How can y be expressed as a function of x? b. What is the relationship between the slopes of the two linear equations? c. How do the xintercepts and yintercepts of the two equations
asked by Sara V. 
MATH
Let f(x) = m1x + b1 and g(x) = m2x + b2 be two linear functions. Answer the following, noting that answers may depend on the the ms and bs. a. Is f (x) + g(x) a linear function of x? b. Is f (x) − g(x) a linear function of x? c. Is f (x) × g(x) a linear
asked by Sara V. 
English
Write the derivative. Urgent care doctors use a variety of methods to determine a patient's ______. (sentient) Choices: sentient or sentience Answer: sentience
asked by Kimmy 
algebra
Please correct,if necessary, and simplify using long division: (724x^2+8x^336x) devided by (x3). My solution: 8x^2+20x+24  8x^34x^236x72 8x^324x^2  20x^236x72 20x^260x  24x72 24x72
asked by Anneliese 
math
If the time in months and the rate of interest per month are in the ratio 4 : 1, and the interest 16% of the principal, then what is the rate of interest? show all steps
asked by ppp 
math
6. For his birthday party, Perry mixed together 3 gallons of Jackson’s fruit punch, and 2 gallons of Bonanza’s fruit punch. Jackson’s fruit punch contains 20% fruit juice, and Bonanza’s fruit punch contains 55% fruit juice. What percent of the
asked by ppp 
math
7. If 60 ml of water contains 12% of chlorine, how much water must be added in order to create a 8% chlorine solution?
asked by ppp 
math
Suppose that a sum of money at simple interest becomes $840 in 1 year and $960 in 4 years. What is the principal?
asked by ppp 
math
A $10, 000 loan advanced on May 1 at 8 1⁄4 % requires two payments of $3000 on July 15 and September 15, and a third payment on November 15. What must the third and final payment be in order to settle the debt?
asked by ppp 
math
12. You has investments totaling $8000 in two accounts: a savings account paying 5% interest, and the other a bond paying 8% interest. If the amount of interest after one year from both investments was $600, how much did you invest in both accounts
asked by ppp 
math
How many seconds are there in 13.5% of 3 hours?
asked by ppp 
math
90 decreased by what percentage is 45.9?
asked by ppp 
math
1. Write as a single power: 420 + 420 + 420 + 420
asked by ppp 
algebra
Please correct my work. Using long division,simplify (8b^36),devided by (2b1) My solution is: 4b^2+2b+1  8b^3 6 8b^34b^2  4b^26 4b^22b  2b6 2b1  5
asked by Anneliese