Tuesday

September 2, 2014

September 2, 2014

Total # Posts: 536

**physics**

the muzzle velocity of a 50.0g shell leaving a 3.00kg rifle is 400 m/s what is the recoil velocity of the rifle
*December 16, 2012*

**statistics**

Scores on the ACT college entrance exam are Normally distributed with a mean µ = 20 and standard deviation σ = 5. An SRS of 25 ACT scores is selected, construct a 95% Confidence Interval for the sample mean (X-Bar) and interpret your result.
*December 3, 2012*

**math**

3x+3y+3z
*November 27, 2012*

**physics**

A solid sphere of radius 23 cm is positioned at the top of an incline that makes 23 degree angle with the horizontal. This initial position of the sphere is a vertical distance 3 m above its position when at the bottom of the incline. The sphere is released and moves down the ...
*November 27, 2012*

**physics**

A cylindrical 7.25 kg pulley with a radius of 0.864 m is used to lower a 7.13 kg bucket into a well. The bucket starts from rest and falls for 4.51 s. What is the linear acceleration of the falling bucket? The acceleration of gravity is 9.81 m/s^2.
*November 27, 2012*

**physics**

A 346 kg merry-go-round in the shape of a horizontal disk with a radius of 1.7 m is set in motion by wrapping a rope about the rim of the disk and pulling on the rope. How large a torque would have to be exerted to bring the merry-go-round from rest to an angular speed of 4.7 ...
*November 27, 2012*

**geography**

Which continent have the oldest fossils been found?
*November 15, 2012*

**physics**

The tub of a washer goes into its spin-dry cycle, starting from rest and reaching an angular speed of 2.9 rev/s in 8.5 s. At this point the person doing the laundry opens the lid, and a safety switch turns oﬀ the washer. The tub slows to rest in 11.6 s. Through how many...
*November 13, 2012*

**physics**

A remote-controlled car’s wheel accelerates at 22.7 rad/s. If the wheel begins with an angular speed of 11.0 rad/s, what is the wheel’s angular speed after exactly twenty full turns?
*November 13, 2012*

**physics**

A remote-controlled car’s wheel accelerates at 22.7 rad/s. If the wheel begins with an angular speed of 11.0 rad/s, what is the wheel’s angular speed after exactly twenty full turns?
*November 13, 2012*

**Pre Calc**

how much money should i invest at 8.2% compounded continuously if i wish to have $100,000 in 5 years?
*November 8, 2012*

**physics**

The planetMars requires 2.35 years to orbit the sun, which has a mass of 2 × 1030 kg, in an almost circular trajectory. Find the radius of the orbit of Mars as it circles the sun. The gravitational constant is 6.672 × 10−11 N · m2/kg2 . Answer in units...
*November 8, 2012*

**fractions from least to greatest**

1/6 4/24 16/96
*November 7, 2012*

**Chemistry**

H2P4: PHOTON EMISSION An electron in Li2+ falls from n = 2 to the ground state. Calculate the wavenumber, (νˉ), of the emitted photon.
*November 3, 2012*

**physics**

A wagon is pulled by a handle making an upward angle of 25° with a force of 25 N. What is the horizontal force pulling the wagon foward? What is the force lifting the wagon off the road?
*November 3, 2012*

**physics**

A 0.104 kg rock is attached to a 1.92 m long string and swung in a horizontal circle at a speed of 29.7 m/s. Find the tension in the string. Neglect the effect of gravity.
*October 31, 2012*

**physics**

A wagon is pulled by a handle making an upward angle of 25° with a force of 25 N. What is the horizontal force pulling the wagon foward? What is the force lifting the wagon off the road?
*October 31, 2012*

**Physics **

A student pushes stright along the handles of a mower with a force of 200 N. The handles make a angle of 20°, with respect to the horizontal. The frictional force for the 25 kg mower is 100 N. What is the normal force on the mower, and what is the acceleration of the mower?
*October 31, 2012*

**Thermodynamics**

Design Problem- A steam boiler may be thought of as a heat exchanger. The combustion gases may be modeled as a streram of air because their thermodynamic properties are close to those of air. Using this model, consider a boiler that is to convert saturated liquid water at 500 ...
*October 31, 2012*

**Thermodynamics**

Design Problem- A steam boiler may be thought of as a heat exchanger. The combustion gases may be modeled as a streram of air because their thermodynamic properties are close to those of air. Using this model, consider a boiler that is to convert saturated liquid water at 500 ...
*October 31, 2012*

**english**

what is the order of imortance? whoever answers this gets to meet my mom the mayor!!!!!!!!!!!!!!!!!!!!
*October 23, 2012*

**Physics**

A m1 = 4.20-kg block on a smooth tabletop is attached by a string to a hanging block of mass m2 = 2.70 kg, as shown in the figure. The blocks are released from rest and allowed to move freely. a) Find the acceleration of the blocks. ___m/s^2 b) Find the tension in the string. ...
*October 16, 2012*

**Physics**

When you take your 1300-kg car out for a spin, you go around a corner of radius 57.8 m with a speed of 15.2 m/s. The coefficient of static friction between the car and the road is 0.82. Assuming your car doesn't skid, what is the force exerted on it by static friction? ...
*October 16, 2012*

**English-Ms. Sue please**

IDK
*October 11, 2012*

**science**

Why might a seed that falls on the ground in November wait until next April to germinate?
*September 27, 2012*

**Biology (PLZ HELP)**

Researchers discovered that zooplankton in Narragansett Bay now graze on floating algae more actively through the winter than they ever did before. What effect do you think this might have on the annual late-winter "bloom" of algae that occurs in the water?
*September 25, 2012*

**Math 8R - Help!!!!!!!!**

1/2+1/2+1/2+1/2+1/2+1/2+1/2= 3 1/2 The answer is 7.
*September 25, 2012*

**Biology**

Researchers discovered that zooplankton in Narragansett Bay now graze on floating algae more actively through the winter than they ever did before. What effect do you think this might have on the annual late-winter "bloom" of algae that occurs in the water?
*September 25, 2012*

**Biology**

How are decomposers like a city's recycling center?
*September 25, 2012*

**math**

In a study of the change of insect population,there was about 170 insects four weeks after the study began and about 320 after two more weeks. Assume an exponential model of growth. a.Find an equation relation the population to the time in weeks. b.estimate initial number of ...
*September 24, 2012*

**Physics**

At t = 0, an automobile traveling north begins to make a turn. It follows one-quarter of the arc of a circle of radius 10.1 m until, at t = 1.52 s, it is traveling east. The car does not alter its speed during the turn. (a) Find the car's speed. (b) Find the change in its ...
*September 23, 2012*

**Physics**

Tricky little problem makers. You don't need the coefficients after all. I got it!
*September 23, 2012*

**Physics**

A crate of potatoes of mass 23.0 kg is on a ramp with angle of incline 30° to the horizontal. The coefficients of friction are μs = 0.78 and μk = 0.35. Find the frictional force (magnitude and direction) on the crate if the crate is at rest. I don't ...
*September 23, 2012*

**chemistry**

When 47.5J of heat are added to 13.2 g of liquid, its temperature rises by 1.72 degrees C. What is the heat capacity of the liquid? A cook wants to heat 1.35kg of water from 32.0 degrees C to 100 degrees C. If he uses combustion of natural gas to heat the water, hou much ...
*September 21, 2012*

**chemitry**

A block of aluminum with a volume of 98.5 cm3 absorbs 67.4 J of heat. If its initial temperature was 32.5°C, what is its final temperature? (density of aluminum = 2.70g/cm3)
*September 21, 2012*

**science**

answer is 269.8m or 270 in significant figures if you are curious.
*September 14, 2012*

**science**

A 49 kg person drinks 270. g of milk, which has a "caloric" value of approximately 3.0 kJ/g. If only 16% of the energy in milk is converted to mechanical work, how high (in meters) can the person climb based on this energy intake? [Hint: The work done in ascending ...
*September 14, 2012*

**College Physics**

7.1 m/s *if only using 2 sig. figs. actual answer = 7.06666667
*August 26, 2012*

**PLEASE HELP CHEM DR BOB :O**

Sort the pairs of related compounds by their carbonyl stretching frequencies in cm–1. (There will be three compounds per bin.) Bin # 1: Slightly higher Bin #2: Slightly lower Compounds: -butanol -but-2-enal -heptan-3-one -hept-4-en-3-one -cinnamaldehyde -3 phenylpropanal
*August 26, 2012*

**Dr. Bob please help :)**

Sort the pairs of related compounds by their carbonyl stretching frequencies in cm–1. (There will be three compounds per bin.) Bin # 1: Slightly higher Bin #2: Slightly lower Compounds: -butanol -but-2-enal -heptan-3-one -hept-4-en-3-one -cinnamaldehyde -3 phenylpropanal
*August 25, 2012*

**Chem**

Sort the pairs of related compounds by their carbonyl stretching frequencies in cm–1. (There will be three compounds per bin.) Bin # 1: Slightly higher Bin #2: Slightly lower Compounds: -butanol -but-2-enal -heptan-3-one -hept-4-en-3-one -cinnamaldehyde -3 phenylpropanal
*August 25, 2012*

**7th grade math **

solve for k -4k-8k+7=-53 Please explain how you found your answer!! Please help!!
*August 8, 2012*

**measurments**

To Ms. sue sorry late reply, no its just a typo but i still need help
*August 7, 2012*

**measurments**

which has the least value? 3130 L+38126 cl+ 3403 ml 394 kl+ 1425 Kl+ 490L please show work!
*August 7, 2012*

**7th grade math**

nevermind i figured it out
*July 26, 2012*

**7th grade math**

1. Substitute: Ms.Kubagwa is six years younger than Ms. Vea. The sum of there ages is 52 years. I HAVE NO CLUE WHAT TO DO HERE!! 2.Ms.starbrowski has four more pens than Mr.Dukeman. Together they have 34 pens. How many pens does Ms.Starbrowski have? *Please explain how you ...
*July 26, 2012*

**Math**

a farmer wants to fence in part of her land so that her chickens will have thier own little area. if she only has 28 feet of fence, what is the area of the largest pen that she can build?
*June 7, 2012*

**Social Studies**

the answer is not oregon because i got it wrong on my test...
*May 31, 2012*

**physics ( DENSITY )**

Assume that the density of a human is 1.13 g/cm3. What is the volume of a 51.5 kg person?
*May 31, 2012*

**Algebra 1A**

The temp dropped 17 degrees. What you do to solve it is 0-17. Though it's already a negative 17 so the equation would look like this: 0-(-17)=17. So the temp has dropped 17 degrees.
*May 20, 2012*

**chemistry**

A bond between two sugar molecules is formed by which of the following types of reactions? oxidation-reduction condensation single-replacement double-replacement
*May 16, 2012*

**math**

Idk
*May 14, 2012*

**statistics**

you have requirement that men must be at least 74 in tall and women must be at least 70 in tall. the men height is 69 in +/-2.8 and women mean height is 63.6 +/-2.5. If the requirement s changed so that the tallest 4% of men and women are eligible, what would be the new ...
*May 14, 2012*

**Math**

24 inches is perimeter but what about the ratio (its been a long time since we went over this in school and I have forgoten a lot)
*April 9, 2012*

**Math**

IN a square with each side measuring 6inches what is the ratio of the perimeter to the area? Please show work for this!!
*April 9, 2012*

**math**

-7, -4, -1, 2 it is a mathematical sequence
*March 30, 2012*

**geometry**

what is the area of a isosceles trapezoid with legs of 15 feet and bases of 10 feet and 28 feet?
*March 26, 2012*

**Science**

What is the total braking distance for a car that is going 60km/h on wet road (0.10)? The drivers reaction time is 1.5 seconds.
*March 12, 2012*

**calculus**

given the circle x^2+y^2+2x-2y-14=0, find it's intersection with the y-axis. please help me....
*March 11, 2012*

**algebra**

f the distance the car traveled after applying the brakes equals 20 feet, what does that mean to the officer investigating the accident? (HINT: Let d = 20, bring 20 to the right so that the equation equals zero, identify the coefficients, A, B and C and then use the quadratic ...
*March 5, 2012*

**algebra**

f the distance the car traveled after applying the brakes equals 20 feet, what does that mean to the officer investigating the accident? (HINT: Let d = 20, bring 20 to the right so that the equation equals zero, identify the coefficients, A, B and C and then use the quadratic ...
*March 5, 2012*

**algebra**

f the distance the car traveled after applying the brakes equals 20 feet, what does that mean to the officer investigating the accident? (HINT: Let d = 20, bring 20 to the right so that the equation equals zero, identify the coefficients, A, B and C and then use the quadratic ...
*March 5, 2012*

**algebra**

Use the following to answer the next three questions: the height, h, of a ball t seconds after it is released for a jump shot in a basketball game can be modeled with the equation h = −16t2 + 12t + 8. The rim of the basket is 10 feet high. Which of the following is the ...
*March 5, 2012*

**algebra**

Use the following to answer the next three questions: the height, h, of a ball t seconds after it is released for a jump shot in a basketball game can be modeled with the equation h = −16t2 + 12t + 8. The rim of the basket is 10 feet high. Which of the following is the ...
*March 5, 2012*

**algebra**

Use the following situation to answer the next four questions. The formula for these questions came from the police department. They use this formula to determine the speed at which the car was going when the driver applied the brakes, by measuring the distance of the skid ...
*March 3, 2012*

**math**

Use the following situation to answer the next four questions. The formula for these questions came from the police department. They use this formula to determine the speed at which the car was going when the driver applied the brakes, by measuring the distance of the skid ...
*March 3, 2012*

**math**

Use your graphing calculator to find how many seconds before the projectile hits the ground. Let y1 = −16t2 + 800t, or factor and solve for t algebraically
*March 1, 2012*

**math**

The length of a rectangle is 3 inches more than its width. If the area of the rectangle is 180 square inches, write an equation for the above situation
*March 1, 2012*

**math**

In a large city league, the boys' baseball teams hold a tournament. If there are 40 teams in the league and half of the teams are eliminated in each round of games, how many teams are left after 3 rounds?
*March 1, 2012*

**Math**

Divide 186 marbles between DON and ANDRE so that DON gets twice as many as ANDRE.:(
*February 26, 2012*

**Chemistry**

Cocaine is a non-electrolyte that has a molecular weight of 303.4 g/mole. How many grams must be dissolved in 25.0 mL of Chloroform (density = 1.484 g/mL) to raise its boiling point to 65.5 Celsius? The boiling point of pure Chloroform is 61.2 Celsius. Kb Chloroform = 3.62 ...
*February 26, 2012*

**calculus**

the area of the first quadrant bounded by the y-axis, the line y=4-x, and the graph of y=x-cosx is approximately
*February 26, 2012*

**chemistry**

An aqueous salt solution is formed by adding 11.67 g sodium sulfate (solute) to water (solvent). What mass (in g) of water is used if the freezing point of the solution is -12.9 oF. Kf H2O = 1.86 oC/m I know to use delta T= i*Kf*m I then solve for m. But, then I'm confused...
*February 26, 2012*

**calculus**

the area of the first quadrant bounded by the y-axis, the line y=4-x, and the graph of y=x-cosx is approximately
*February 26, 2012*

**statistics**

THIS WAS MY ANSWER a)Identify the population and the sample. N (population) is ALL phones produced per day n (sample) is 40 random phones from the day’s production b) Is the population parameter in this study known or unknown? Explain. UNKNOWN - Parameter is the numerical...
*February 22, 2012*

**statistics**

A manufacturer of cell phones has decided that an assembly line will be considered to be operating satisfactorily if less than 0.02% of the phones produced per day are defective. To check the quality of a day's production, the company decides to randomly sample 40 phones ...
*February 22, 2012*

**Chemistry**

Can someone confirm the answer for this. I worked it out and got an answer of 85.5 torr. Is this right? Can someone please put the answer to this so I can check. Thanks. That would be helpful.
*February 18, 2012*

**Com arts**

In the Book FareWell to Manzanar. What chapter did momma break her dishes?
*February 14, 2012*

**physics**

A certain projectile is launched with an initial speed Vo. At its highest point its speed is Vo / 6. What was the launch angle?
*February 9, 2012*

**PhysicsIn what direction relative to north must ca**

An astronaut on the planet Zircon tosses a rock horizontally with a speed of 6.65 . The rock falls through a vertical distance of 1.50 and lands a horizontal distance of 8.90 from the astronaut. What is the acceleration of gravity on Zircon?
*February 9, 2012*

**PhysicsIn what direction relative to north must ca**

Two canoeists start paddling at the same time and head toward a small island in a lake, as shown in the figure . Canoeist 1 paddles with a speed of 1.60 at an angle of 45 north of east. Canoeist 2 starts on the opposite shore of the lake, a distance of 1.5 due east of canoeist...
*February 9, 2012*

**Algebra**

In order to solve this problem, you would have to distribute the negative (- sign) to the (x-2), making the problem x+2-x+2. The two x's would cancel out, therefore making the final answer 4.
*February 6, 2012*

**math**

The answer would be 7x+3y. The reason for this, is because you have to combine the "like" terms (8x goes with -x; -2y goes with 5y).
*February 6, 2012*

**math**

Idk
*February 1, 2012*

**science**

you get on the beach ball and float
*January 25, 2012*

**math**

NEVER MIND! THANK U!!!:)
*January 17, 2012*

**math**

how do u get 24
*January 17, 2012*

**math**

10z-8+2z-16=36 z=?
*January 17, 2012*

**English**

Is it "'un-acknowledged" or "unacknowledged" or neither of these and there is no such word? (I'm trying to write an essay.) Thanks!
*December 13, 2011*

**English/Commas**

Yes, I seem them now and have a better understanding. Thank you!
*December 13, 2011*

**English/Commas**

Okay, thank you! Are all of the commas placed in the correct spots?
*December 13, 2011*

**English/Commas**

Here is another try. I am not sure about number two, if it is, I added another comma in front of the name. 1. As I understand it, John Pearson, has lived in Winston Colorado, a small almost unknown tourist resort since August 10, 2002. 2. I have some roses planted, Mrs. Roper...
*December 13, 2011*

**English/Commas**

I was asked to put all the commas in the correct place for each sentence. I am unsure about some. Are these correct? Thanks 1. As I understand it, John Pearson has lived in Winston Colorado, a small almost unknown tourist resort since August 10, 2002. 2. I have some roses ...
*December 13, 2011*

**English/Grammar**

I was told to write a paragraph with less than 100 words. The paragraph below has 94 words. I will only receive points if there are NO grammar or punctuation errors. Are there any errors in my paragraph below? Thanks. The new library being constructed costs over forty million ...
*December 8, 2011*

**Calc 3**

Find the volume of the wedge-shaped region contained in the cylinder x^2 + y^2 = 1 and bounded above by the plane z = x and below by the xy-plane. The picture is a cylinder with a diagonal plane through it creating a wedge. Thanks! ;)
*November 29, 2011*

**chemistry**

Calculate the pH of an aqueous solution containing 1.6 x 10-2 M HCl, 2.0 x 10-2 M H2SO4, and 1.8 x 10-2 M HCN.
*November 19, 2011*

**Physics**

A 822 kg car accelerates from rest to 101 km/h in 1.15s. What change in momentum does the force produce?
*November 16, 2011*

**Sentences**

Are my sentences correct with the following directions? (Sentences below directions) Using California as a topic, number and write one example of each of the following: 1. A completely correct simple sentence with an appositive in it. 2. A sentence with redundant language. ...
*November 3, 2011*

**English**

Thank you!
*October 27, 2011*

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