# Samuel

Most popular questions and responses by Samuel-
## General chemistry

Phosphorus pentachloride is produced by the reaction between phosphine and chlorine gas. What mass of chlorine gas would be required to produce 0.015kg of phosphorus pentachloride?

*asked on March 31, 2019* -
## Probability

The letters in the word MATHEMATICS are arranged randomly. What is the probability that the first letter is E? Preview What is the probability that the first letter is M?

*asked on March 25, 2016* -
## geometry

A park maintenance person stands 16 m from a circular monument. Assume that her lines of sight form tangents to the monument and make an angle of 47°. What is the measure of the arc of the monument that her lines of sight intersect? Please don't just

*asked on May 3, 2012* -
## chemistry

A 130.0 mL buffer solution is 0.100 M in NH3 amd 0.135 M in NH3 and 0.135 M in NH4Br. What mass of HCI could this buffer neutralize before the pH fell below 9.00?

*asked on November 6, 2011* -
## math

Camp Oaks gets 32 boxes of orange juice and 56 boxes o apple juice.Each shelf in the cupboard can hold 8 boxes of juice. What is the least number o shelves needed for all the juice boxes?

*asked on January 21, 2015* -
## Calculus

A voltage V across a resistance R generates a current I=VR. If a constant voltage of 4 volts is put across a resistance that is increasing at a rate of 0.3 ohms per second when the resistance is 4 ohms, at what rate is the current changing? (Give units.)

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

There are 6 muffins in a package.How many packages will be needed to feed 48 people if each person has 2 muffins? A.4 B.8 C.16 D.24

*asked on January 21, 2015* -
## algebra

A rectangular piece of cardboard measures 17cm by 14cm. Strips of equal width are cut off one side and one end. The area of the remaining piece is 108cm^2. Find the width of the strips removed.

*asked on October 28, 2011* -
## General chemistry

If 10g of phosphine is made to react with 15g of chlorine gas, calculate the percentage yield if 5.5g of phosphorus pentachloride was experimentally produced

*asked on March 31, 2019* -
## Arithmetic

The sum of three consecutive terms of a geometric progression is 42, and their product is 512. Find the three terms.

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

A rectangle is drawn so the width is 7 inches longer than the height. If the rectangle's diagonal measurement is 46 inches, find the height.

*asked on December 13, 2012* -
## chemistry

the molarity of 2% by weight of aqueous solution of H2S4(molecular weight = 98)

*asked on July 5, 2013* -
## Geometry

The area of a regular octagon is 35 cm². What is the area of a regular octagon with sides three times as long?

*asked on April 2, 2012* -
## Physics 11 - Dynamics

While standing on a horizontal frictionless surface a 50.0 kg student pushes against a wall with an average force of 125 N to the right for 0.110 s. Calculate the velocity of this student at 1.110 s. My answer: Vf = 0.275 m/s My solutions book has Vf =

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

a 6.5 ounce can of tuna for $1.39 or a 3 ounce can of tuna for $0.65. the 6.5 ounce can of tuna costs ________ the 3 ounce can of tuna costs __________ the ______ ounce can of tuna is the better buy

*asked on December 9, 2015* -
## science

An empty relative density bottle weighs 25g.it weighs 65g when filled with a liquid and 75g when with water.caculate the density of the liquid.

*asked on January 31, 2013* -
## math

the minute hand of a clock is 6cm long.how far does the end of the hand travel is 35minute

*asked on March 3, 2018* -
## physics

(1) a car travelling at a constant speed of 20ms-1 overcomes a constant frictional resistance of 300N. What is the horse power of the engine? ( take 1h.p = 3/4 kw)

*asked on November 21, 2016* -
## English

Why traditional african marriage is an advantage for men only not, women

*asked on April 21, 2014* -
## Probability

A computer password is required to be 9 characters long. How many passwords are possible if the password requires 2 letter(s) followed by 7 digits (numbers 0-9), where no repetition of any letter or digit is allowed?

*asked on March 25, 2016* -
## 2D Animation

Lesson 3: Wrapping Up Unit 10 2-D Animation Unit 10: Character Animation there are 15 questions plz help me

*asked on April 14, 2019* -
## Chemistry Help

If it takes three "breaths" to blow up a balloon to 1.2 L, and each breath supplies the balloon with 0.060 moles of exhaled air, how many moles of air are in a 3.0 L balloon? i am trying to use v1/n1=v2/n2 but i am stuck, can u help? thank you

*asked on October 15, 2010* -
## Social Studies

Victory at which Battle convinced the British to help the Americans? I'm thinking its the Battle of Saratoga

*asked on August 14, 2017* -
## Algebra

a. For the first company, express in words the amount the cab company charges per ride and per mile. Charge per ride: $3 per mile $0.50 b. Write an equation in slope-intercept, point-slope, or standard form. Explain why you chose the form you did.

*asked on December 12, 2017* -
## 2D Animation

a weighting of 100 in the weight painting mode is represented by which of the following the color blue the ratio 1:1 the color red the ratio 2:1

*asked on April 14, 2019* -
## physics sl

A dead dog of mass 2.2 kg and an initial speed of 5.5 m.s-1 slides along a rough horizontal surface and stops after travelling 4.2 m. calculate the frictional force between the dog and the surface (Think of the work the friction has to do to stop the dog

*asked on October 4, 2015* -
## math

If the wheel of a bicycle has a diameter of 60cm, calculate how far a cyclist will have travelled after the wheel has rotated 100 times.

*asked on January 15, 2015* -
## CHEM

on a heating curve graph...what factors determine the lengths of the flat regions of the graph and slope of the curve between the flat regions

*asked on January 21, 2010* -
## math

Write a system of equations, three equations/three unknowns, that has (1, 2, 3) as the solution. for this can I just write any random coefficient and then put that as equal to 1,2 or 3? or if not what type of math would I use?

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

How is the equator similar to the prime meridian?

*asked on January 6, 2018* -
## physics

A stone of mass 0.7kg is projected vertically upward with a speed of 5m/s.calculate the maximum height reached. [Take g=10m/s^2 and neglect air resistance]. "

*asked on February 13, 2016* -
## chem

What volume of 0.200 M H2SO4 will be needed to neutralize 50mL of 0.178 N NaOH? i don't even know how to start

*asked on December 14, 2009* -
## chemistry

Phosgene (COCl2) is an extremely poisonous gas that was used extensively in World War I as a chemical warfare agent. At 300oC, phosgene decomposes to carbon monoxide and chlorine with a Kp = 6.8 x 10-2. Calculate the pressure in the vessel at equilibrium

*asked on October 13, 2008* -
## Algebra

The first term of an A.P is 3 and the fifth term is 9.Find the number of terms in the progression if the sum of the progression is 81.

*asked on February 19, 2019* -
## math

During the summer holidays,your brother earns extra money mowing lawns.He mows 6 lawns an hour and has 21 lawns to mow.How long will it take him?

*asked on April 7, 2015* -
## Math

Austin pays $1.50 per day for high speed internet after paying the equipment fee of $35.00. Identify the constant of proportionality that relates his internet charges (y) to the number of days (x) he has internet.

*asked on December 30, 2016* -
## physics

the earth is on average 150million km from the sun calculat its average speed in orbit

*asked on November 30, 2018* -
## math

Find the perimeter of the given triangle. Round your answer to the nearest tenth if necessary. ∆BCH, if ∆CBH ∼ ∆FEH, ADEG is a parallelogram, BH = 4, HE = 7, EF = 25, and HF = 24.

*asked on December 16, 2017* -
## science

'Imagine there is a tank of unknown gas that contains 53.31% carbon, 11.18% hydrogen, and 35.51% oxygen by mass. At 35.0 °C and 0.455 bar, 2.00 L of the gas has a mass of 3.20 g. Using this information, answer the following questions. a.) What is the

*asked on October 27, 2014* -
## Algebra

Determine whether the graphs of the equations are parallel, perpendicular, or neither. y=-x+2 y=-x-3

*asked on May 5, 2008* -
## science

how would you determine the relative density of kerosene using a relative density bottle

*asked on January 11, 2019* -
## Chemistry

What is the oxidation half reaction for the following equation: Cr2O7^-2 +Fe+2 - - > Cr^+3 + Fe^+3 Cr^+3 - - > Cr2O7^-2 Fe^+2 - - > Fe^+3 Fe^+3 - - > Fe^+2 Cr2O7^-2 - -> Cr^+3***

*asked on May 31, 2016* -
## math

What are the steps to show the quotient in simplest form? 0.000027/0.000009

*asked on September 30, 2015* -
## College Physics

The point charges in Figure 17.41 are located at the corners of an equilateral triangle 25.0 cm on a side, where qb = +12.0 µC and qc = -4.50 µC. (Assume that the +x-axis is directed to the right.) (a) Find the electric field at the location of qa.

*asked on March 24, 2014* -
## AP BIO

If a particular experiment were known to have a transformation efficiency of 3 x 103 bacteria/ìg of DNA, how many transformant colonies would be expected to grow on the LB/amp/ara plate?

*asked on April 7, 2010* -
## Maths

The total surface area of a rectangular solid is 130cm, if the solid is 7cm long and 5cm wide. Calculate the height

*asked on February 7, 2019* -
## Chemistry

In the zinc-copper cell, Zn(s) | Zn^+2(1M) || Cu^+2(1M) | Cu(s), which electrode is negative? Cu^+2 Cu(s) Zn(s)*** Zn^+2

*asked on May 31, 2016* -
## Economics!

Suppose a chemical company is in a perfectly competitive industry and has a short run total cost curve of TC = q3 + 5q2 + 10q + 10 and a short run marginal cost of SMC = q2 + 10q + 10. At the price of 49, how many will be produced?

*asked on May 4, 2016* -
## math

The perimeter of a rectangular concrete patio is 38 meters. The area is 90 square meters. What are the dimensions of the patio?

*asked on January 14, 2016* -
## Chemistry

1. You have gone back in time and are working with Dalton on a table of relative masses. Following are his data: 0.602g gas A reacts with 0.295g gas B 0.172g gas B reacts with 0.401g gas C 0.320g gas A reacts with 0.374g gas C a) Assuming simplest formulas

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

A water molecule consists of an oxygen atom and two hydrogen atoms. Oxygen has a mass of 16 atomic units (u) and each hydrogen has a mass of 1 u. The hydrogen atoms are each at an average distance of 96 pm ( 96 x 10 -12 m) from the oxygen atom, and are

*asked on October 13, 2008* -
## Math

In a circle whose center is O, arc AB contaisn 100 degrees. Find the number of degrees i angle ABO?

*asked on July 24, 2017* -
## Chemistry

Wha volum of steam is produced when log of propyrie is burnt in excess oxygen at s.t.p?

*asked on June 21, 2013* -
## physics

Alley club-ax consists of a symmetrical 8 kg stone attached to the end of a uniform 2.5 kg stick that is 98 cm long. The dimensions of the club-ax are that the stcik is 80 cm across and the stone is tied to the stick is 18 cm long. How far is the center of

*asked on October 13, 2008* -
## Calculus

At noon, ship A is 20 nautical miles due west of ship B. Ship A is sailing west at 23 knots and ship B is sailing north at 17 knots. How fast (in knots) is the distance between the ships changing at 5 PM? (Note: 1 knot is a speed of 1 nautical mile per

*asked on March 1, 2010* -
## English III (11th grade)

Lana woke up, curled in a corner of the seat at the back of the train. She lifted the shade to see that the sun had hidden itself in a bank of clouds fluffy as the eiderdown her mother had wrapped her in as a child. Her darling Ted, a military man with a

*asked on May 12, 2014* -
## Math

You write 5 1⁄2 pages of a report in 2 1/3 hours. What is the average number of pages you write per hour?

*asked on December 10, 2017* -
## Chemistry

A compound on analysis as 87:8% c,12:2%h determine its empirical formular&molecular formular given mass=56gmol

*asked on January 25, 2016* -
## physics

A cube of balsa wood (side length = 0.25 m) is tied with a string to the bottom of a waterfilled container. The wood is completely immersed. What is the tension in the string?

*asked on July 29, 2013* -
## chemistry

what will haprn if ammonium chloride solution is used to standardize potassium tetraoxamaganate VII solution instead of ammonium iron II sulphate

*asked on May 11, 2016* -
## Science

A compound on analysis as 87:8% c,12:2%h determine its empirical formular&molecular formular given mass=56gmol

*asked on January 25, 2016* -
## Math

2 vertices of a triangle are 1,-4 and 6,-4. List 2 possible coordinates of the third vertex so that the triangle has an area of 20 units.

*asked on April 24, 2014* -
## math

the bearing of Y from X is 160¤ and the bearing of Z from Y is 060¤. find the bearing of X from Z.

*asked on May 11, 2013* -
## math

A diver on a platform 40 feet in height jumps upward with an initial velocity of 5ft/s. His height in h feet after t seconds is given by the function h=-16t^2+5t+50. a. What is his maximum height? I got 50.39 b. How long will it take him to reach the

*asked on March 25, 2015* -
## math/physics

Estimate the percentage savings in the fuel bill if the thermostat is set back from 68 degrees F to 50 degrees F for 12 hours of the day, and left at 68 degrees F for the other 12 hours, assuming an outside temperature of 15 degrees F all day.

*asked on April 26, 2013* -
## Chem 101

Consider the reaction of 82.0 g of oxygen as follows: 4Fe + 3O2 2Fe2O3 How many moles of oxygen react? How many moles of iron must react? How many moles of product form? What mass of product forms?

*asked on August 26, 2010* -
## chem

why do elements in the same family generally have similar properties?

*asked on January 24, 2010* -
## natural disasters

how can the magnatic record inside a valcanic roskbe used to determine the latitude at which the lava cooled?

*asked on September 7, 2009* -
## math

Using the vertices: B(-9,1), E(2,3), F(12, -2), G(1,-4). Determine whether BEFG is a rhombus, a rectangle, or a square. List all that apply and show the steps

*asked on February 1, 2018* -
## Arithmetic

A geometric series has a positive common ratio of r. The series has a sum to infinity of 9 and the sum of the first two terms is 5. Find the first four terms of the series.

*asked on November 25, 2017* -
## math

calculate the volume of the solid when the composite of a cube of edge is 28cm and the square -based pyramid of it height is 16cm

*asked on April 18, 2016* -
## Physics 11

Displacement is given by x=2+3t+4t². Find the value of instantaneous acceleration.

*asked on March 13, 2013* -
## math

a wheel is making 300rev/min about its center, calculate the angular velocity of any point on the wheel about the center. also find the speed of a point at a distance of 2cm from the center.

*asked on June 24, 2012* -
## physics

Uniform rod of weight 10N and length 5m is supported by ropes from points P and Q. The rope at P is attached 1.0m from end M and the rope at Q is attached 0.25m from end O. find the tensions Tp and Tq

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

unscramble "elasel" in french; unscramble "ionmaes" in french. Thank you

*asked on December 17, 2009* -
## physics

An athlete at the gym holds a 4.33 kg steel ball in his hand. His arm is 75.0 cm long and has a mass of 5.28 kg. What is the magnitude of the torque about his shoulder if he holds his arm straight out to his side, parallel to the floor? Responses Physics -

*asked on October 13, 2008* -
## Math

I am 10years old my sister is 4years,in how many years shall i be twice as old as she will be?

*asked on September 3, 2017* -
## statistics

a survey from teeneage research unlimited found that 30% of teenage consumers receive their spending money from parttime jobs. If 5 teenagers are selected at random, find the probability that at least 3 of them have part time jobs

*asked on March 22, 2017* -
## physics

A piece of copper of mass 40 grams at 20 degrees Celsius is placed in a copper calorimeter of mass 60 grams containing 50 grams of water at 10 degrees Celsius .ignoring heat losses,what will be the final steady temperature after stirring?(specific heat

*asked on May 29, 2016* -
## physic

Two forces 5N and 10N act on a body in the direction due North and east respectively at an angle 75 degree. Calculate the resultant force of the inclined angle.

*asked on May 15, 2016* -
## finite math

The Megabuck Hospital Corp. is to build a state-subsidized nursing home catering to homeless patients as well as high-income patients. State regulations require that every subsidized nursing home must house a minimum of 760 homeless patients and no more

*asked on March 8, 2014* -
## math

what rate of annual simple interest is equivalent to 9% per annum compounded semi-annually for 3 years

*asked on June 24, 2012* -
## free will baptiste

i am trying to help my daughter with home work but don't understand question. Show 30, Broken Key is 3. Show several ways. if am able to solve one i can help her to the rest.

*asked on September 28, 2011* -
## Physics

A car travels 2.06 km in the x-direction, then turns left 70.3 degrees to the original direction and travels an additional distance of 4.23 km. Calculate the x component of the car’s net displacement. Let : d1 = 2.06 km, theta = 70.3 degrees , and d2 =

*asked on February 1, 2011* -
## economics

Given that the monopolist demand curve is Qd=200-2P, TC=#900 and P= #55. What is the total profit?

*asked on April 9, 2010* -
## chem

what does the heating curve of ethanol look like? im really confused about this...

*asked on January 21, 2010* -
## physics

A pendulum consists of an object of mass 1.07 kg that hangs at the end of a massless bar, a distance 1.14 m from the pivot point. Calculate the magnitude of the torque due to gravity about the pivot point if the bar makes an angle of 22° with the

*asked on October 13, 2008* -
## math

In a random sample of 200 students who were asked their favorite color, it was found that twenty more students liked blue than purple and eight fewer liked green than blue. Find the number of students who chose each color as their favorite. I posted this

*asked on November 6, 2017* -
## life orientation

indetify three courses are interested after grade 12

*asked on March 13, 2016* -
## logics in programming

for A=1 to 30

*asked on December 9, 2015* -
## Elective maths

A particle P of mass 7kg is suspended by two inextensible strings AP,BP of lengths 40cm and 75cm respectively. The ends, AP of the strings are attached to two point at the same level, whose distance apart is 85cm. Find angle APB and the magnitude of the

*asked on October 6, 2015* -
## Chemistry

If an aquarium tank holds 100 litres of water, calculate how much heat energy would be required to heat the tank from 18.2 Degrees(C) to 32 Degrees(C)

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

4g of an organic compound gave 2.34g of carbon 0.16g of hydrogen 0.46g of nitrogen 1.04g of oxygen.what is the empirical formula

*asked on June 22, 2015* -
## physicss

state the precision of the measured quantities 1. 0.07 m 2. 908 s 3. 7.60 L 4. 0.005 0 mm answers: 1. 0.01 m 2. 1 s 3. 0.01 L 4. 0.0001 mm i do not understand this , please explain it to me

*asked on February 4, 2015* -
## physics

state the precision of the measured quantities 1. 353g 2. 6.00cm please explain

*asked on February 4, 2015* -
## Economics

Can someone help me with #1 - a,b,c it is on economics20145.weebly

*asked on December 11, 2014* -
## Physics

A person pulls a crate with 120 N of force against 100 N of friction a distance of 5 meters. Find the energy the person expends pulling the crate, the amount of energy converted to heat via friction, and the increase in the kinetic energy of the crate.

*asked on November 20, 2012* -
## ap chemistry :(

consider the reaction C6H14 + 9.5O2 yields 6CO2 + &H2) at constant pressure. which response is true? 1. work may be done on or by the system as the reaction occurs, depending upon the temperature. 2. work is done on the system as the reaction occurs. 3. no

*asked on October 18, 2012* -
## Probability and Statistics

Can someone tell me what formula I should use? The number of milligrams of tar in filtered and unfiltered cigarettes is being compared. The following cigarettes are pulled to be part of the samples: Filtered: bunch of data Unfiltered: bunch of data The

*asked on November 30, 2010* -
## Chem 101 science

Rank the following samples in number of atoms from least to greatest. a) 2 mol of K atoms b) 48 g of S c) 27 g of Be d) 50 g of Na

*asked on August 26, 2010*