Saturday
April 19, 2014

Posts by K


Total # Posts: 722

Physics
A 1.1 kg block slides along a friction-less surface at 1.4 m/s. A second block, sliding at a faster 4.3 m/s, collides with the first from behind and sticks to it. The final velocity of the combined blocks is 2.6 m/s. What was the mass of the second block?

Physics
A 9.6 kg dog takes a nap in a canoe and wakes up to find the canoe has drifted out onto the lake but now is stationary. He walks along the length of the canoe at 0.53 m/s, relative to the water, and the canoe simultaneously moves in the opposite direction at 0.12 m/s. What is ...

Physics
A 9.6 kg dog takes a nap in a canoe and wakes up to find the canoe has drifted out onto the lake but now is stationary. He walks along the length of the canoe at 0.53 m/s, relative to the water, and the canoe simultaneously moves in the opposite direction at 0.12 m/s. What is ...

Math
5/36

Physics
an object has a charge of -2.0 microcoloumbs, how many electrons must be removed so that the charge becomes +3.0 microcoloumbs? I'm not sure of which formula to use

world history
Why did different regions in Africa develop in different ways between 1000 and 1700?

algebra
six people ate one tenth of a pie and there was two fifth left. How much pie did she start with?

chem
what is the ph of a solution in which 250.0 ml of .200 M HNO3 is added to 280.0 ml of .150 Ba(OH )

chem
what is the ph of a solution in which 250.0 ml of .200 M HNO3 is added to 280.0 ml of .150 Ba(OH )

chem
what is the ph of a solution in which 250.0 ml of .200 M HNO3 is added to 280.0 ml of .150 Ba(OH )

chem
what is the ph of a solution in which 250.0 ml of .200 M HNO3 is added to 280.0 ml of .150 Ba(OH )

chem
what is the ph of a solution in which 250.0 ml of .200 M HNO3 is added to 280.0 ml of .150 Ba(OH )

chem
what is the ph of a solution in which 250.0 ml of .200 M HNO3 is added to 280.0 ml of .150 Ba(OH )

PHYSICS!!!
Water flowing through a garden hose of diameter 2.72 cm fills a 25.0-L bucket in 1.10 min. (a) What is the speed of the water leaving the end of the hose? m/s (b) A nozzle is now attached to the end of the hose. If the nozzle diameter is one-third the diameter of the hose, wha...

PHYSICS!!!
A liquid (ñ = 1.65 g/cm3) flows through a horizontal pipe of varying cross section as in the figure below. In the first section, the cross-sectional area is 10.0 cm2, the flow speed is 288 cm/s, and the pressure is 1.20 105 Pa. In the second section, the cross-sectional...

PHYSICS!!!
A hypodermic syringe contains a medicine with the density of water (figure below). The barrel of the syringe has a cross-sectional area of 2.89 10-5 m2. In the absence of a force on the plunger, the pressure everywhere is 1.00 atm. A force of magnitude 2.13 N is exerted on the...

PHYSICS!!!
Water moves through a constricted pipe in steady, ideal flow. At the lower point shown in the figure below, the pressure is 1.70 105 Pa and the pipe radius is 2.80 cm. At the higher point located at y = 2.50 m, the pressure is 1.22 105 Pa and the pipe radius is 1.70 cm. (a) Fi...

PHYSICS!!!
The Venturi tube shown in the figure below may be used as a fluid flowmeter. Suppose the device is used at a service station to measure the flow rate of gasoline (ñ = 7.00 102 kg/m3) through a hose having an outlet radius of 2.72 cm. The difference in pressure is measur...

PHYSICS!!!
A square metal sheet 3.1 cm on a side and of negligible thickness is attached to a balance and inserted into a container of fluid. The contact angle is found to be zero, as shown in Figure (a), and the balance to which the metal sheet is attached reads 0.40 N. A thin veneer of...

PHYSICS!!!
To lift a wire ring of radius 1.95 cm from the surface of a container of blood plasma, a vertical force of 1.79 10-2 N greater than the weight of the ring is required. Calculate the surface tension of blood plasma from this information. Answer in N/m

PHYSICS!!!
A certain fluid has a density of 1045 kg/m3 and is observed to rise to a height of 2.4 cm in a 1.0-mm-diameter tube. The contact angle between the wall and the fluid is zero. Calculate the surface tension of the fluid. Answer in N/m

PHYSICS!!!
A straight horizontal pipe with a diameter of 1.0 cm and a length of 46 m carries oil with a coefficient of viscosity of 0.11 N · s/m2. At the output of the pipe, the flow rate is 8.4 10-5 m3/s and the pressure is 1.0 atmosphere. Find the gauge pressure at the pipe inpu...

PHYSICS!!!
A thin 1.8-mm coating of glycerine has been placed between two microscope slides of width 1.0 cm and length 4.0 cm. Find the force required to pull one of the microscope slides at a constant speed of 0.35 m/s relative to the other slide. Answer in N

PHYSICS!!!
A thin 1.8-mm coating of glycerine has been placed between two microscope slides of width 1.0 cm and length 4.0 cm. Find the force required to pull one of the microscope slides at a constant speed of 0.35 m/s relative to the other slide. Answer in N

PHYSICS!!!
A pipe carrying 20°C water has a diameter of 3.6 cm. Estimate the maximum flow speed if the flow must be streamline. Answer in cm/s

PHYSICS!!!
Sucrose is allowed to diffuse along a 8.0-cm length of tubing filled with water. The tube is 6.1 cm2 in cross-sectional area. The diffusion coefficient is equal to 5.0 10-10 m2/s, and 8.0 10-14 kg is transported along the tube in 18 s. What is the difference in the concentrati...

PHYSICS!!!
Glycerine in water diffuses along a horizontal column that has a cross-sectional area of 2.0 cm2. The concentration gradient is 3.1 10-2 kg/m4, and the diffusion rate is found to be 5.4 10-15 kg/s. Determine the diffusion coefficient. Answer in m2/s

physics!!!
The viscous force on an oil drop is measured to be 6.0 10-13 N when the drop is falling through air with a speed of 9.0 10-4 m/s. If the radius of the drop is 2.5 10-6 m, what is the viscosity of air? Answer in N x s/m^2

Chemistry
The combustion of how many moles of ethane would be required to heat 838 grams of water from 25.0 to 93.0 degrees C? Assume liquid water is formed during the combustion.

Chem
A 53.31-g sample of water at 88.8 degrees C is added to a sample of water at 23.9 degrees C in a constant- pressure calorimeter. If the final temperature of the combined water is 43.3 degrees C and the heat capacity of the calorimeter is 26.3 J/degrees C, calculate the mass of...

math
grant's change rack contained $8.80 in quarters, dimes, and nickels. There were two more than five times as many nickels as quarters and four less than twice as many dimes as quarters. How many of each kind of coin was there in the change rack? please help

math
The second of three numbers is 1 less than than the first. The third number is 5 less than the second. if the first number is twice as large as the third, find the three numbers. write an equation and find the numbers

math
the greater of two numbers is 1 more than twice the smaller. three times the greater exceeds 5 ties the smaller by 10. find the numbers and write the equation. please help me

math
The second of three numbers is 1 less than than the first. The third number is 5 less than the second. if the first number is twice as large as the third, find the three numbers. write an equation and find the numbers please help me

physics
two masses one on an inclined plane at 30 degrees the other suspended

college physics
Newton's second law states that for every action there is an equal and opposite reaction. Draw a force diagram. It is moving at a constant velocity. Your force diagram for an object moving at a constant velocity is the same as your force diagram for an object at rest, so y...

Chemistry
lh

Chem
Paper thickness varies. Typically, 100 sheets are about a cm thick. Atoms typically vary from 1 to 3 angstroms in radius. (An angstrom is 10-10 m.) Suppose a piece of paper is 0.0073 cm thick. How many atoms span the thickness if the radius of the atom is 1.94 angstroms?

geology
why do planets appear to move with respect to stars?

algebra
Perform the subtraction. (4x/x^2+2x-8)-(x/x^2-16)

math-algebra
Factor the polynomial 64x^3-27

geology
determine the Radiocargon age of the sample from its % Modern value. Fragment of Roman Gladiator leather harness 77% modern ___ radiocarbon age BP ____ correct radiocarboned age

geology
Below are descriptions of samples, with known ages expressed as either AD or BC (also called BCE). Convert these dates to BP dates (using 1950 as "the present.") 1. Wood from Egyptian coffin - from the Ptolemic period based on style. Date: 200 ± 150 years BCE

Physics
9

Physics
Good luck with your AGU entrance exam test this Saturday. :D

math
How many ounces of water could be held in a cylinder that has a radius of 2inches and a height of 7 inches if every cubic inch of volume cantains one-fourth ounce of water?

geography
1. All of the following are among the Pillars of Islam except. A. performing daily prayers. B. memorizing the Koran. C. giving to charity. D. making a Hajj. 2. What was the result of Iran's 1979 revolution? A. The Sunnis defeated the Shiites in their struggle for control o...

math
Give the component form of the resultant vector in the following. u = (10, 5) -3u = ?

chemistry
Thank you very much Dr. Bob for your help. I didn't post the original question, but was working on a similar problem. It probably would have taken me an hour to figure this out without your help. Thanks again!

Math help please
(This homework question was removed due to a copyright claim submitted by k12.com.)

Chemistry
Amino acid solution was made by taking 3.58 g of the dry amino acid and making it up to 1.00L in water. A 25.0 mL sample was taken and titrated with NaOH of concentration of 0.0493M, with the first equivalence point at 18.15 mL and the second equivalence point at 32.05 mL. Wha...

combine functions.. please help.
Given: f(x)=2x^2-x+1 g(x)=2 sin x h(x)=3^x Determine: a) f(g(x)) b) (h^-1 o f)(x) c) g(f(h(x)))) Please show steps, thank you very much.

World Civilizations
A Hindu society in Southeast Asia that resisted both Buddhism and Islam was

5th grade math
She either scored 196 or 327 points Explaination: Range is difference between greatest and smallest numbers. We know the answer of range that is 129. If we consider 325 as greatest number than we can subtract 129 from 325 and get smallest number - 196. If we consider 198 as sm...

chemistry
The rate constant for this first-order reaction is 0.0570 s–1 at 400 °C. A-->Products After how many seconds will 14.0% of the reactant remain?

geom/trig
The base of a right rectanglar prism is 12 cm by 8 cm. The height is 5 cm. Find its surface area.

algebra 2
evaluate f(x) = x^-2/3 + x^-3 for each value of x. f(-8)

math
name two different numbers that are greater than .66 and less than .9

calculus
f(x)= 3x^7 +2x -9 If g(x)= f inverse of x and g(-4)= 1, what is g'(-4)? I know that f inverse is the same as 1/f'(x) but I'm not sure where to go from there.

math
Seven thousand raffle tickets are to be sold at $10 each to benefit a local community group. The prizes, the number of each prize to be given away, and the dollar value of winnings for each prize are as follows: Prize Number to Be Given Away Dollar Value Automobile 2 $21,730 E...

math
Suppose that an automobile parts wholesaler claims that .5 percent of the car batteries in a shipment are defective. A random sample of 200 batteries is taken, and four are found to be defective. (a) Use the Poisson approximation to find the probability that four or more car b...

math
A telephone company's goal is to have no more than 4 monthly line failures on any 100 miles of line. The company currently experiences an average of 5 monthly line failures per 50 miles of line. Let x denote the number of monthly line failures per 100 miles of line. Assumi...

math
A telephone company's goal is to have no more than 4 monthly line failures on any 100 miles of line. The company currently experiences an average of 5 monthly line failures per 50 miles of line. Let x denote the number of monthly line failures per 100 miles of line. Assumi...

calculus
Find the limit. lim h → 0 square root (49 + h) − 7 / h Note: Only 49 +h are under square root.

chemistry
A patient has 0.050 L of blood drawn and this volume of blood has a mass of 55.0 g. What is the density of the blood? Answer with the correct number of sig figs

chemistry
(3.84 x 103 x 0.764) + 1.59 answer with the correct sig figs

Chemistry - Naming Compounds
Name the following compound. Ba3Pb2 I don't really understand since both the elements are metals and usually these bonds occur with a metal and nonmetal or two nonmetals.

chemistry
Chloroquine is used to treat malaria. Studies have shown that an effective dose for children is 3.5 mg per kilogram (3.5 mg/kg) of body weight, every 6 hours. If a child weighs 21 kg, how many milligrams of this drug should be given in a 66 hour period?

chemistry
Which of the following is a situation where an object’s potential energy varies as a result of changes due to its chemical composition? The melting of ice. The burning of wood. A ball rolling down a hill. A parachute slowing a skydiver's fall.

chemistry
Which of the following is an example of a chemical change (change in chemical composition) that involves starting with a liquid and ending up with a gas? Burning gasoline (combustion). Boiling acetone. A pond evaporating. Condensation of steam.

Calculus
what is the inverse function of f(x)=-[sqrt(25-x^2]

calculus (limits)
Use limits to explain why f(x)= (7-3X)/(X+9) has a vertical asymptote.

chemistry
A solar heating specialist is considering paraffin as a possible solar heat collector. How many kilograms of paraffin would be needed to collect as much energy as 4.73 x 10^3 kg of water? The specific heat of paraffin is 2.90J/gxC. Hint: Assume the same temperature change.

chemistry
A solar heating specialist is considering paraffin as a possible solar heat collector. How many kilograms of paraffin would be needed to collect as much energy as 4.73 x 10^3 kg of water? The specific heat of paraffin is 2.90J/gxC. Hint: Assume the same temperature change.

trig
find the exact value of sin(u+v) given that sin u=3/5 and sin v= 15/17

Physics
A race driver has made a pit stop to refuel. After refueling, he starts from rest and leaves the pit area with an acceleration whose magnitude is 5.4 m/s2; after 3.7 s he enters the main speedway. At the same instant, another car on the speedway and traveling at a constant vel...

Physics
A jetliner, traveling northward, is landing with a speed of 66.5 m/s. Once the jet touches down, it has 766 m of runway in which to reduce its speed to 13.1 m/s. Compute the average acceleration (magnitude and direction) of the plane during landing (take the direction of the p...

Physics
In getting ready to slam-dunk the ball, a basketball player starts from rest and sprints to a speed of 11.1 m/s in 2.30 s. Assuming that the player accelerates uniformly, determine the distance he runs.

Physics
A race driver has made a pit stop to refuel. After refueling, he starts from rest and leaves the pit area with an acceleration whose magnitude is 5.4 m/s2; after 3.7 s he enters the main speedway. At the same instant, another car on the speedway and traveling at a constant vel...

math
did you get the answer to this?

physics
a 1.29 kg ball is connected by means of two massless strings to a vertical, rotating rod. The strings are tied to the rod and are taut. The tension in the upper string is 38 N. The length of both strings is 1.70m and the distance between the strings on the rod is 1.7.

Math
In this problem, x cubed = 12y...how do you solve to determine if this is direction variation or not?

algebra
Katydid population is modeled by N(t) = 50 / 1+9e^ -.33t where t is number ofyears and N(t) is population is thousands at time t. when will katydid population reach 40,000? I somehow got a negative log, producing an error so i can't go any farther. Please help.

7th Math
what would you do than with 5/8 ??

7th Math
A plumber must bend a piece of tubing twice, allowing 5/8 inch for each bend. use the total of 12 1/2, 16 3/4, and 18 3/4. To find the total length of tubing needed?

Physics Honors
8.7s,56.55m

Finance
Tuttle Buildings Inc. has decided to go public by selling $5,000,000 of new common stock. Its investment bankers agreed to take a smaller fee now (6% of gross proceeds versus their normal 10%) in exchange for a 1-year option to purchase an additional 200,000 shares at $5.00 pe...

Finance
Rainier Bros. has 12.0% semiannual coupon bonds outstanding that mature in 10 years. Each bond is now eligible to be called at a call price of $1,060. If the bonds are called, the company must replace them with new 10-year bonds. The flotation cost of issuing new bonds is esti...

Finance
Thompson Enterprises has $5,000,000 of bonds outstanding. Each bond has a maturity value of $1,000, an annual coupon of 12.0%, and 15 years left to maturity. The bonds can be called at any time with a premium of $50 per bond. If the bonds are called, the company must pay flota...

physics
In a large hotel, a fast elevator takes you from the ground floor to the 21st floor. The elevator takes 17 s for this trip: 5 s at constant acceleration, 7 s at constant velocity, and 5 s at constant deceleration. Each floor in the hotel has a height of 2.5 m. Calculate the va...

Math
390

Math
Show how the Commutative Property of Addition works using the numbers 2, 3, and 5.

Math
Minnie has 6 country CDs and 5 rock CDs. Amanda has 5 rock CDs and 6 country CDs. Who has more CDs? Explain.

mkt 421
Marketing strategy planners should recognize that

mkt 421
Dell, Inc. wants to offer customers televisions in addition to computers. This is a change in their _____________________

mkt 421
For Tesla, a new firm that makes an electric sports car, estimating how many competitors will make electric vehicles and what kinds they will make, is:

equilibrium constant (Kp)
What is the equilibrium constant "Kp" at 200 C for the reaction below: P4(s) + 6 Cl2(g) --><-- 4 PCL3(l) Given the following at 200 C P4(s)+ 10 Cl2(g) --><-- 4 PCl5(s) Kc=8.12 PCl3(l)+ Cl2(g) --><-- PCl5(s) Kc=0.771 Answer: 6.7*[10^(-9)] not sure wh...

Statistics
foofy computes the correlation between an individual's physical strength and his or her college grade poing average. Using a computer, the correlation for a sample of 2000 people is r(1998)=+.08, p=<.0001. she claims this is a useful tool for predicting which college ap...

Chemistry
The following standard free energies are given for 25 degrees celcius. 1) N2(g) + 3H2(g)-> 2NH3(g) delta g = -33.0 kJ 2) 4NH3(g) + 5O2(g)-> 4NO(g) + 6H20() delta g = -1010.5 kJ 3) N2(g) + o2(g)-> 2NO(g) delta g = 173.1kJ 4) N2(g) + 2O2(g) -> 2NO2(g) delta g = 102.6...

statistics
Heights of fences are normally distributed with a mean of 52 inches and a standard deviation of 4 inches. Find the probability that one randomly selected fence is under 54 inches.

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