# Posts by K

Total # Posts: 960

**Physics**

a=(Vf-Vi)/t Vf=0 (it stopped moving) Vi=(150/5.4)m/s=28m/s total t = 9.3s so a=(0-28)/9.3 = 3 m/s

**Design**

New Wave

**physics**

A 91.0 N grocery cart is pushed 17.1 m along an aisle by a shopper who exerts a constant horizontal force of 42.0 N. The acceleration of gravity is 9.81 m/s2 . If all frictional forces are neglected and the cart starts from rest, what is the grocery cart’s final speed? ...

**Letter to Mrs.Sue**

what happened? And gabby, check my question please.. I'm confused!

**math**

The perimeter of the office bulletin board is 24 ft. The perimeter of the sandbox is 1 1/2 times as long. What is the perimeter of the sandbox?

**physics**

20

**Physics**

(77.6)(3500)(2.78)=M(2.42E^6) 755048=M(2.42E^6) M=0.312

**stats math**

34

**Physics**

A spaceship of mass 2.3×10^6 kg is cruising at a speed of 6.0×10^6 m/s when the antimatter reactor fails, blowing the ship into three pieces. One section, having a mass of 5.2×10^5 kg, is blown straight backward with a speed of 2.0×10^6 m/s. A second ...

**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**

I have this question also

**7th grade math Ms. Sue please**

Number 5 is A. 20% I got it wrong because I picked B. 80%.

**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

**math but also probability**

1/81

**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 )

**statistics**

1/6

**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, ...

**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) ...

**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 ...

**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 ...

**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 ...

**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 ...

**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?

**physics**

24

**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 ...

**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. ...

**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 ...

**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?

**Music**

d

**geom/trig**

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

**College Physics**

my calculator is giving me 0.00345. How did you figure it out?

**Trigonometry**

35.5

**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 ...

**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 ...

**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. ...

**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. ...

**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

**physical science**

27 KM/Hr

**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 ...

**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 ...

**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 ...

**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.