Sunday

September 21, 2014

September 21, 2014

Total # Posts: 70,823

**Physics**

a.)2π radians = 1 revolution 4π radians = 2 revolutions 4*π=12.56637061 rad b.) (2rev/ 5.5sec)(2π radians/revolution) (0.363636)(6.283185301) = 2.284794657
*July 7, 2014*

**Physics**

Suppose that a disk rotates through two revolutions in 5.5 seconds. (a) What is its displacement in radians in this time? (b) What is its average rotational velocity in rad/s?
*July 7, 2014*

**Physics**

a.) 2 b.) 2
*July 7, 2014*

**Physics**

Consider two cases in which the same ball is thrown against a wall with the same initial velocity. In case A, the ball sticks to the wall and does not bounce.In Case B, the ball bounces back with the same speed that it came with. a.) In which of the two cases is the change in ...
*July 7, 2014*

**Physics**

a.) KE= 1/2mv*v 1/2(11300)(19.3)2= 2104568.5 J b.) Mtotal=5carts*11300kg=56500kg Vfinal= Pfinal/Mtotal (11300)(19.3)/56500= 3.86 KEfinal= 1/2(Mtotal)(Vfinal) 1/2(56500)(3.86)2= 420913.7 c.) carts stick together so perfectly inelastic which means energy is NOT conserved
*July 7, 2014*

**Physics**

Four railroad cars, all with the same mass of 11300 kg, sit on a track, as shown in the figure below. A fifth car of identical mass approaches them with a velocity of 19.3 m/s (to the right). This car collides and couples with the other cars. (a) What is the kinetic energy of ...
*July 7, 2014*

**Physics**

Four railroad cars, all with the same mass of 11300 kg, sit on a track, as shown in the figure below. A fifth car of identical mass approaches them with a velocity of 19.3 m/s (to the right). This car collides and couples with the other cars. (a) What is the kinetic energy of ...
*July 7, 2014*

**Riddle**

your driving a bus. at the first stop you pick up 10 people then you pick up 789 people and on the right you drop off 453 so what is the bus drivers name?
*July 7, 2014*

**chemistry**

4g NaOH is dissolved in 100mL of 2.5M H2SO4 will be required for its complete neutralization?
*July 7, 2014*

**Chemistry**

If a solution of formic acid contains 0.2 M HCHO2, 0.006 M CHO2-, and 0.006 M H+, What is the Ka of the acid? What is the ph of the solution at the concentrations given? What would happen to the equilibrium position if more CHO2- were added to the solution?
*July 7, 2014*

**general chem**

what is the mass percent of sodium hydroxide in a solution that is made by dissolving 8 grams of sodium hydroxide in 50 grams of h2o answer
*July 7, 2014*

**Physics**

Consider two cases in which the same ball is thrown against a wall with the same initial velocity. In case A, the ball sticks to the wall and does not bounce.In Case B, the ball bounces back with the same speed that it came with. A.)In which of the two cases is the change in ...
*July 7, 2014*

**Physics**

Four railroad cars, all with the same mass of 11300 kg, sit on a track, as shown in the figure below. A fifth car of identical mass approaches them with a velocity of 19.3 m/s (to the right). This car collides and couples with the other cars. (a) What is the kinetic energy of ...
*July 7, 2014*

**Physics**

A railroad car with a mass of 12400 kg collides and couples with a second car of mass 18700 kg that is initially at rest. The first car is moving with a speed of 7.7 m/s prior to the collision. (a) What is the initial momentum of the first car? (b) If external forces can be ...
*July 7, 2014*

**Physics**

A.)p = m * v With the bullet travelling at v =413 m/s with a mass of 0.0045 kg: p(bullet) = 0.0045 * 413 p(bullet) = 1. 8585 N.s answer: 1.8585 N.s B.)The recoil velocity of the rifle, this is a conservation of momentum problem. So, p(initial) = p(final) In other words, the ...
*July 7, 2014*

**Physics**

A rifle with a mass of 1.84 kg fires a bullet with a mass of 4.5 g (0.0045 kg). The bullet moves with a muzzle velocity of 413 m/s after the rifle is fired. (a) What is the momentum of the bullet after the rifle is fired? (b) If external forces acting on the rifle can be ...
*July 7, 2014*

**Physics**

a.) impulse= 60kg x (18.4-0)= 1104 kg/s B.) avg force= impulse/time 1104/0.6= 1840 N
*July 7, 2014*

**Physics**

A 60-kg front seat passenger is moving in a car initially with a speed of 18.4 m/s is brought to rest by an airbag in 0.6 sec. (a) What is the impulse acting on the passenger? (b) What is the average force acting on the passenger in this process?
*July 7, 2014*

**Physics**

Impulse=Ft a.) (36.7)(0.3)= 11.01 N.s b.) same answer as part a = 11.01 impulse=change in momentum
*July 7, 2014*

**Physics**

A force of 36.7 N acts on a ball for 0.3 sec. If the ball is initailly at rest (a) What is the impulse on the ball? (b) What is the final momentum of the ball?
*July 7, 2014*

**Physics**

momentum= mass x velocity momentum of bowling ball: (7)(1.73)=12.11 momentum of baseball: (0.12)(25.1)=3.012 answer: a.) the bowling ball has the larger momentum
*July 7, 2014*

**Physics**

A bowling ball has a mass of 7 kg and a speed of 1.73 m/s. A baseball has a mass of 0.12 kg and a speed of 25.1 m/s. Which ball has the larger momentum? a. The bowling ball. b. More information needed c. The baseball. d. Both have the same momentum
*July 7, 2014*

**Physics**

a.) (208N)(0.058s)=12.064 N.s b.) same answer as part a = 12.064 impulse= change in momentum
*July 7, 2014*

**Physics**

An average force of 208 N acts for a time interval of 0.058 s on a golf ball. (a) What is the magnitude of the impulse acting on the golf ball? (b) What is the change in the golf ball's momentum?
*July 7, 2014*

**statistics**

Describe one of the following experiments, which study human subjects, in 450 to 750 words: A pharmaceutical company wants to test a new sleep aid. An educational company is interested in determining whether their new math curriculum will raise standardized test scores. ...
*July 6, 2014*

**English**

adverb seen this question before.
*July 6, 2014*

**physics**

How many electrons pass through a lamp in 3 minutes.If the current is 300 ma?
*July 6, 2014*

**Poetry**

As we find with most songs, in poetry
*July 6, 2014*

**math**

Mang jose wants to make a table which has an area of 6m, the length of the table has to be 1m longer than the width. If the width of the table is p meters, what will be the length. Form a quadratic equation that represent the equation.
*July 6, 2014*

**math**

10%
*July 6, 2014*

**vocabulary**

Thank you for your help
*July 5, 2014*

**vocabulary**

Yes it says: Imagery: the formation of mental images, figures, or likenesses of things, or of such images collectively: the dim imagery of a dream. so it should be D
*July 5, 2014*

**vocabulary**

I don;t know is really confuseing for me, i'm stuck on this question about 20 min hehe
*July 5, 2014*

**vocabulary**

Yes I was checking in on wikipedia
*July 5, 2014*

**vocabulary**

I was thinking between C, and D, so is it D ? Becacuse i dont think this will be irony or puns
*July 5, 2014*

**vocabulary**

Most often, these are words that evoke mental pictures as we read or play on other senses. A. Irony B. Puns C. Antithesis D. Imagery Is it C ?
*July 5, 2014*

**PHI 208**

Harm may be understood as:
*July 5, 2014*

**Physics **

Four rocks are thrown horizontally from a building, with varying speeds and from various floors. Rock 1 lands a distance r away from the building, rock 2 lands 2r away from the building, rock 3 lands at distance 3r, and rock 4 at 4r. Ignore air resistance. Drag the rocks into ...
*July 5, 2014*

**Physics**

A dog sits on the left end of a boat of length L that is initially adjacent to a dock to its right. The dog then runs toward the dock, but stops at the end of the boat. If the boat is H times heavier than the dog, how close does the dog get to the dock? Ignore any drag force ...
*July 4, 2014*

**physics**

thanKS Henry
*July 4, 2014*

**physics**

Two cars are approaching a perpendicular intersection without a stop sign. Car 1 has a mass 900 kg and is heading north and car 2 has mass 900 kg and is heading west. The two cars collide at the intersection, and stick together as a result of the collision. The police report ...
*July 4, 2014*

**physics**

A firecracker explodes, sending pieces of equal mass in three directions as shown in the diagram. Angle θ is 14 degrees, and angle ϕ is 30 degrees. Assume that the firecracker is initially at rest, and take upward and rightward as the positive directions. What are ...
*July 4, 2014*

**Physics**

Two NBA players are revered for their ability to dunk a basketball, i.e., both players can jump very high. The first player is a tall, heavy center, and the second player is an average height, slim guard. The first player is 1.5 times the mass of the second player, and the ...
*July 4, 2014*

**Physics**

Two skaters, Alan and Betsy, move toward each other on a very smooth skating rink. Their masses and speeds are respectively: 60 kg; 4.0 m/s and 50 kg; 0.4 m/s. After the skaters collide and use their hands to push each other away, Alan is moving backwards at 2.0 m/s. Taking ...
*July 4, 2014*

**Math**

$2000*.09=$180 $180*6months= $1080
*July 4, 2014*

**ACCOUNTING**

86,500 ASSETS = 50,500 LIABILITIES+OWNERS EQUITY hOW DO I SOLVE THIS PROBLEM
*July 3, 2014*

**Urgent Calculus Help**

Damon, is it always positive and changes sign?
*July 3, 2014*

**Urgent Calculus Help**

Based on the following table of values for the function w(t), answer the questions below. t and w(t) are a table with the following values: (100,2.6), (110,7.3), (120,12.7), (130,19), (140,26.1), (150,34.1) a) Which of the following best describes the derivative of w(t)? A. ...
*July 3, 2014*

**Calculus Help**

Sketch the graph first. You will notice it's increasing and concave up. This should help with answering. (if not, the solution is always positive for both)
*July 3, 2014*

**math**

in november 2008, apple stock dropped from $105 to $95 per share, and Microsoft dropped from $21 to $20 per share. If you invested a total of $3,570 in these stocks at the end of October and sold them for $3,250 at the end of November, how many shares of each stock did you buy?
*July 2, 2014*

**Organiation administration**

One of the most frequent causes of game protests is: Use of officials without ratings Poor sportsmanship of spectators Use of ineligible players Failure to pay agreed fees Dishonesty of officials
*July 2, 2014*

**Physics**

A net force of 44N accelerates a 5.4-kg mass over a distance of 13 m. a. What is the increase in kinetic energy of the mass?
*July 2, 2014*

**Physics**

A rope applies a horizontal force of 208 N to pull a crate a distance of 1.91 m across the floor. A frictional force of 154 N opposes this motion. (a) What is the work done by the force applied by the rope? (b) What is the work done by the frictional force? What is the total ...
*July 2, 2014*

**government**

people who believe voting is important have high political ----c-c-
*July 1, 2014*

**chemistry**

where can I find compounds that are basic in nature that are inorganic bases and organic bases?
*July 1, 2014*

**chemistry**

molecular wt of glucose is 180.14g/mole. What is the quanity of glucose in a 500mL IV solution of a 5% dextrose normal saline contain?
*July 1, 2014*

**Heron's formula**

some Problems based on heron's formula at home
*July 1, 2014*

**chemistry**

Sodium carbonate, Na2CO3(s), can be prepared by heating sodium bicarbonate, NaHCO3(s). 2NaHCO3(s) → Na2CO3(s) + CO2(g) + H2O(g) Kp = 0.34 at 160 ºC If a sample of NaHCO3 is placed in an evacuated flask and allowed to achieve equilibrium at 100 ºC, what will the...
*July 1, 2014*

**algebra**

The debate team has m members. Each member sold 20 coupon books as a fundraiser. Write a variable expression that shows the number of coupon books the club sold.
*July 1, 2014*

**math**

The midpoint of two points is (6,2). If one of the points is (3,5), find the other point. x_m = (x_1 + x_2)/2 6 = (3 + x_2) / 2 = 3 + x_2 x_2 = y_m = (y_1 + y_2)/2 2 = (5 + y_2) / 2 = 5 + y_2 y_2 = Endpoint (x_2, y_2)= ( , )
*July 1, 2014*

**chemistry**

How many grams of calcium nitrate (molar mass = 164 g) would be formed if 0.500 g of calcium chloride (molar mass = 111 g) were reacted with an excess of silver nitrate (molar mass = 170. g
*June 30, 2014*

**statistics**

simple randon sampling uses a sample size n
*June 30, 2014*

**physics**

A car traveling at2.24m/s skids and stops in 2.55s determine the skidding distance of car
*June 30, 2014*

**creating enviornment**

which of the following behaviors might be resolved by changing the environment? a. two children fighting over a toy fire engine. b. children wandering rather than participating in activities during center time. c. children climbing on furniture d. all of the above
*June 29, 2014*

**creating environment for learning**

thank you
*June 29, 2014*

**creating environment for learning**

tenille is sitting with a group of preschool children at lunch time. which of the following is an example of an open-ending question? a. do you like apples or oranges better b. what are the ways that apples and oranges are alike? c. what color are the beets? d. what do you say...
*June 29, 2014*

**creating environment for learning**

its d
*June 29, 2014*

**creating environment for learning**

which of the following behaviors might be resolved by changing the environment? a. two children fighting over a toy fire engine. b. children wandering rather than participating in activities during center time. c. children climbing on furniture d. all of the above
*June 29, 2014*

**English**

Is the usage of me and I correct in the following sentences? If not, what would be the correct way to say these sentences? 1. I wish I had known about these picture board systems then, as it may have enhanced the communication between the children and me. 2. It was frustrating...
*June 29, 2014*

**Wood working**

If I have a board 31 1/4 " long and want 13 stripes on it how wide will each stripe be
*June 29, 2014*

**statistics**

Select which of the following are examples of parameters from these examples. Question options: The probability that a ticket with be a winner is .2 (or a 20% chance) The proportion of winning tickets in the sample of 100 99% of samples will have between 37% and 43% of voters ...
*June 29, 2014*

**ph208**

What would be the most plausible message that Groundhog Day is communicating about the relation between ethical standards and individual happiness? (Points : 1)
*June 29, 2014*

**pre-cal**

if the helicopter is moving forward at 30 mph and drops 400 feet in the elevation while the vehicle is moving 48 mph, how does the angle of depression change after 10 minutes?
*June 29, 2014*

**Physics**

A large store escalator that is designed to transfer customers to one floor to another, a vertical distance of 8.0m. It takes each person 20 seconds to ride from bottom to top of the escalator. Explain how you would determine the power of the escalator motor.
*June 29, 2014*

**Physics**

A person with a mass of 55kg climbs a tower with a height of 11m in 25 minutes. What power is produced?
*June 27, 2014*

**Calculus help**

assume that the initial deposit is $20000 and the nominal annual interest rate is 5.7%. Determine the amount in the account in 10 years if the interest is compounded as follows (round your answers to the nearest dollar): (a) Annually: P=20000(1.057)^10 (b) Monthly: (c) Weekly...
*June 27, 2014*

**physics**

An object with a mass of 50.0 g displaces 230.0 ml of water when it is completely immersed. What is the buoyant force on the mass? (Use g = 9.8 N/kg as necessary.)
*June 27, 2014*

**NEED HELP WITH CALC**

Suppose strontium-90 decays at a rate of 2 percent per year. (a) Write the fraction P of strontium remaining, as function of t, measured in years. (Assume that at time t=0 there is 100 % remaining.) Answer: P(t) = (b) Estimate the half-life of strontium. Answer: Hint: Use your...
*June 27, 2014*

**calculus**

a.) choice 1
*June 27, 2014*

**calculus**

Choice 1: Payments of $ 2600 now, $ 3200 a year from now, and $ 3880 two years from now. Choice 2: Three yearly payments of $ 3200 starting now. Modification: Interest is compounded continuously instead of annually. (a) If the interest rate on savings were 4.86 %, which would ...
*June 27, 2014*

**calculus**

sdsas
*June 27, 2014*

**calculus**

Suppose strontium-90 decays at a rate of 2 percent per year. (a) Write the fraction P of strontium remaining, as function of t, measured in years. (Assume that at time t=0 there is 100 % remaining.) Answer: P(t) = (b) Estimate the half-life of strontium. Answer: Hint: Use your...
*June 27, 2014*

**Math**

a) In order to express the function y = 1311 x − 4, as a composition of two functions the outer of which is an exponential function, we would let u be equal to the inner function, u = , and then write y as a function of u, as follows: y = . (b) In order to express the ...
*June 27, 2014*

**Math**

Redo problem 13 from section 1.8 of your textbook (page 62), but use the functions in the questions below rather than the functions in your textbook: (a) In order to express the function y = 1311 x − 4, as a composition of two functions the outer of which is an ...
*June 27, 2014*

**Math**

Choice 1: Payments of $ 2600 now, $ 3200 a year from now, and $ 3880 two years from now. Choice 2: Three yearly payments of $ 3200 starting now. Modification: Interest is compounded continuously instead of annually. (a) If the interest rate on savings were 4.86 %, which would ...
*June 27, 2014*

**Math**

A culture of bacteria grows exponentially. It doubles in size every 81 hours. How long will it take to triple from its original size? Answer: hours.
*June 27, 2014*

**Math**

Suppose strontium-90 decays at a rate of 2 percent per year. (a) Write the fraction P of strontium remaining, as function of t, measured in years. (Assume that at time t=0 there is 100 % remaining.) Answer: P(t) = (b) Estimate the half-life of strontium. Answer: Hint: Use your...
*June 27, 2014*

**English **

the only car for him is one of those new GTO's.
*June 27, 2014*

**calculus**

Pretend the world's population in 1989 was 5 billion and that the projection for 2017 is 7.5 billion. What annual rate of growth is assumed in this prediction?
*June 27, 2014*

**calculus**

Pretend the world's population in 1989 was 5 billion and that the projection for 2017 is 7.5 billion. What annual rate of growth is assumed in this prediction?
*June 27, 2014*

**physics**

140
*June 27, 2014*

**math**

find if 6 box have.they each having60,30,20 and 15 what next two
*June 27, 2014*

**math**

Share 7m in the ratio 32:3
*June 27, 2014*

**math**

The sales goal for your store this week $22,682. The sales goal for your store this week last year was $20,128. Your store has averaged 1775 transactions perweek or the last four weeks. What is the percent change in your sales goal from this week last year to this week this year?
*June 27, 2014*

**Algebra**

Find the GCF 12x^3 and 20x^2. 4x^2????
*June 26, 2014*

**science**

Thank you ;)
*June 26, 2014*

**science**

This what I am stuck on, what specific policies might the United States enact to reduce its impact on global climate change? The rest I know how to complete.
*June 26, 2014*

**science**

As the United States is one of the largest contributors to atmospheric carbon emissions, what specific policies might the United States enact to reduce its impact on global climate change? Using at least two scholarly or reputable resources and your textbook, discuss the ...
*June 26, 2014*

**psychology**

humans rely heavily on the sense of because evolution designed us to be more active during the day time than at night
*June 26, 2014*

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