Tuesday

January 17, 2017
Total # Posts: 1,612

**Physics**

Vbullet = Vblock-bullet * (Mblock-bullet) / Mbullet 1/2 Mbb Vbb^2 = Mbb g * .658 * 6.66 Vbb = √(2 g * .658 * 6.66)

*January 17, 2016*

**Math/ algebra**

you found the answer...1/16 6.25%

*January 17, 2016*

**Maths**

just find the perfect squares on either side of the given root A) √4 , √9 --- 2, 3 B) √25 , √36 --- 5, 6 the rest work the same way

*January 17, 2016*

**chem**

Zn + 2 HCl ---> ZnCl₂ + H₂ so .1 moles of HCl reacts with .05 moles of Zn molar mass of Zn is 65.38 g .05 * 65.38 = ?

*January 17, 2016*

**Chemistry**

the temperature change of the air is 10.0ºk (C)...not 283.15

*January 13, 2016*

**Physics**

the change in energy from the bottom of the circle to the top is... (m g h) h = 90 cm the centripetal force at the top is only gravitational... m g velocity at top ... m v^2 / r = m g ___ v = √(r g) ... r is 45 cm the KE at the bottom equals the KE ___ at the top, PLUS (...

*January 13, 2016*

**Math**

adding 7 __ 4e^(-.03x)=20 dividing by 4 __ e^(-.03x)=5 taking natural log __ -.03 x = ln(5) dividing by -.03 __ x = ln(5) / -.03

*January 13, 2016*

**Algebra**

the 1st two answers are EQUATIONS of lines parallel lines have the same slope so just change the +7 to something else you are right about the perpendicular slope__so change the -2 to 1/2 the x-intercept means that y equals zero__so plug in zero for y and find x the form will ...

*January 13, 2016*

**Math/Physics**

1st measure __ h / tan(19º) = d 2nd measure __ h / tan(28.3º) = d - 910 substitute for d and solve for h

*January 13, 2016*

**Math**

If I put $20,000 into a CD in 1990, with a recurring 8.125% interest rate, how much would that amount to in 2015?

*January 11, 2016*

**english**

Which sentence is correct? a.Each guitar must be in their own case. b.Each guitar must be in its own case.****** c.Each guitar must be in his or her own case. ******-answer

*December 11, 2015*

**english**

is it C. why wouldn't it be B

*December 9, 2015*

**english**

Which sentence is punctuated correctly? a.“Thunder is good,” said Mark Twain, “But it is lightning that does the work.” b.“Thunder is good, said Mark Twain, but it is lightning that does the work.” c.“Thunder is good,” said Mark Twain...

*December 9, 2015*

**Chemistry**

nope mr estrada, i didnt, that's why i asked you

*December 9, 2015*

**Chemistry**

Did u think about it?

*December 9, 2015*

**Math**

Arianna is taking care of her uncle's dog during the week. He left 3 cans of food for 5 days. How much good should she give each day assuming the dog eats exactly the same amount each day

*December 6, 2015*

**algebra**

two mechanics worked on a car the first mechanic worked for 15 hours and the second mechanic worked for 5 hours together they charged a total of 1525 what was the rate charged per hour by each mechanic if the sum of the two rates was 175 per hour

*November 3, 2015*

**Math**

If you would walk around the earths Equator with an average speed of 5 miles per hour, how many days would you need to walk to come back to your starting point?

*October 21, 2015*

**math**

how to explain to my son write doubles fact you can use to find the sum.Write the sum 2+3=

*October 19, 2015*

**Math**

Mara finished 1/5 of her assignment on Saturday and 3/8 of her assignment on Sunday. What fraction of her assignment did she complete on Saturday and Sunday? --Thank you!--

*September 30, 2015*

**Algebra**

The boat travels 60 miles to an island and the same 60 miles coming back. Changes in the wind and tide made the average speed on the return trip 3 mph slower than the speed on the way out. If the total time of the trip took 9 hours, find the speed going to the island and the ...

*August 1, 2015*

**math**

express a single logarithm 1/3 log(b, x+3) log(b, y-4) log(b, x)

*June 23, 2015*

**math**

$8669.93

*June 23, 2015*

**physics**

A body is projected at an angle of 30degree to the horizontal with a velocity of 150metre per seconds.Calculate the time it takes to reach the greatest height,take g=10metre per seconds square and neglect air resistance.

*June 18, 2015*

**math**

A can of oil is 8 inches high and 8 inches in diameter. What is the approximate volume of the can?

*June 6, 2015*

**Physics**

A person whose mass is m = 96.0 kg steps on a mechanical bathroom scale placed on an inclined plane that makes the angle α = 15.3° with the horizontal. What is the reading on the scale?

*May 28, 2015*

**Statistics**

The manager of a company wants to investigate job satisfaction among its employees. One morning after a meeting, she talks to all 25 employees who attended. Does this sampling plan result in a random sample? What type of sample is it? Explain.

*May 13, 2015*

**math**

Why does Zara have a good driving record?

*April 26, 2015*

**Statistics**

Sammy and Sally each carry a bag containing a banana, a chocolate bar, and a licorice stick. Simultaneously, they take out a single food item and consume it. The possible pairs of food items that Sally and Sammy consumed are as follows. chocolate bar - chocolate bar licorice ...

*April 13, 2015*

**Calculus**

In a poll of 400 voters in a certain state, 61% said that they opposed a voter ID bill that might hinder some legitimate voters from voting. The margin of error in the poll was reported as 4 percentage points (with a 95% degree of confidence). Which statement is correct? A. ...

*April 9, 2015*

**Calculus**

Joe dealt 20 cards from a standard 52-card deck, and the number of red cards exceeded the number of black cards by 8. He reshuffled the cards and dealt 30 cards. This time, the number of red cards exceeded the number of black cards by 10. Determine which deal is closer to the ...

*April 9, 2015*

**Algebra**

(8,3);y=-1/4x+7

*March 19, 2015*

**Statistics**

A researcher predicts that watching a film on institutionalization will change students’ attitudes about chronically mentally ill patients. The researcher randomly selects 36 students, shows them the film, and gives them a questionnaire about their attitudes. The mean ...

*March 16, 2015*

**Physics**

What is the volume of water at 95 degrees Celcius if at 5 degrees Celcius the water is 5.56L?

*March 11, 2015*

**Physics**

A raft measures 1.7m x 0.67m x 0.14m, and it has a mass of 13.5kg. What is the maximum mass that the raft can hold and still stay afloat

*March 11, 2015*

**not school**

Needing help setting up equation.if 1/4 of inch is equal to one foot of actual size dimension,determine the length represented by 7/8.is it a division problem.and if so he would I write it out

*March 11, 2015*

**chemistry**

1. formula for Molality = n(solute)in mol/(m(solvent)) in (Kg) so: first convert mass of C7H8 into moles, then divide that by the mass of cyclohexane, which in this case is 15.8 g, then multiply by 1000 to convert to Kg. Report the answer to three significant figures. Ans: ...

*February 9, 2015*

**Math**

What simplified common fraction is equivalent to 0.05757575757

*January 24, 2015*

**accounting**

The Bean Company makes a sale with an invoice price of $97,000 on 10/1/14. The note is due on 10/1/17. There is no interest rate stated in the note. The market rate for similar notes is 10%. Assume annual compounding of interest. Prepare the journal entries for 10/1/14, 12/31/...

*January 19, 2015*

**Math**

Math

*November 12, 2014*

**math**

in a group of 180 person composed of men, women and children there are twice as many men as women and three times as many women as children. how many are there each?

*November 9, 2014*

**Algebra**

A woman invests $15000 in 2 separate investment accounts. One account earns 5.1%, one earns 4.2% simple interest. If she earns $21 in interest total, how much did she earn from each account. I keep getting x to be 67,666.67 by getting to this equation: .051x + .042(15000-x) = ...

*October 28, 2014*

**Math**

Eight-ninths of a bunch of marbles remain on a table. The square root of half the total number of marbles have rolled away. Also, the two children who are playing with the marbles each hold one marble. Find the total number of marbles in the bunch.

*October 20, 2014*

**Math**

18/25

*October 15, 2014*

**business**

it is a movement

*September 25, 2014*

**math**

Jason took 3/4 of an hour to paint 27 1/3 square yards. How many square yards does he paint per hour?

*September 24, 2014*

**physics**

A bullet is fired through a wooden board with a thickness of 8.0 cm. The bullet hits the board perpendicular to it, and with a speed of +350 m/s. The bullet then emerges on the other side of the board with a speed of +210 m/s. Assuming constant acceleration (rather, ...

*September 11, 2014*

**science**

h1 = -1/2 g t^2 + 100 h2 = -1/2 g t^2 + 50 t the balls cross when h1 equals h2 looks like 2 sec

*September 10, 2014*

**math**

12.5= 3/k how do u solve k?

*August 7, 2014*

**physics**

A.) the height of the slope is ___ 500m * sin(24º) GPE = m g h b.) .2 m g h = 1/2 m v^2 .4 g h = v^2

*July 14, 2014*

**Math**

the probability of at least one being defective equals 1 minus the probability that all three are good 1 - (5/8)^3 = .756 (approx)

*July 10, 2014*

**Lea408**

can someone please tell me if I am right Like optical scanners, capacitance fingerprint scanners generate an image of the ridges and valleys that make up a fingerprint. But instead of sensing the print using light, the capacitors use electrical current. (Points : 1) True False...

*June 8, 2014*

**Chemistry**

a sulfuric acid solution that is 65.0 h2so4 by mass has a density of 1.55 g/mL. What is the molality of sulfuric acid in this solution

*May 31, 2014*

**Data Management**

In a multiple choice test that contains ten questions with each question having five possible answers, what is the probability that Colin will pass the test if he merely guesses at each question?

*May 22, 2014*

**statistics**

A test designed to check for sickle-cell anemia has an 85% chance of detection in that, if a person has the disease, there is an 85% chance that the test will be positive. And, if the person does not have the disease, there is an 85% chance that the test will be negative. We ...

*May 13, 2014*

**statistics**

A laptop computer manufacturer found that by improving their battery design, they could increase the time that the laptop computer could be used on a single charge. To verify this improvement, they compared a sample of 10 laptops installed with the improved batteries to a ...

*May 13, 2014*

**statistics**

Five coins all balanced the same were tossed 150 times. Note that, while the coins are all balanced the same, they may or may not be fair coins. Since five coins were tossed, the possible number of heads for each toss could be zero through five. The following table gives the ...

*May 13, 2014*

**science**

Dissecting yw have a great great day ppl

*May 7, 2014*

**CRJ**

Please advise if I am right or wrong thanks

*May 4, 2014*

**CRJ**

7. D 8. B 9. B 10.A

*May 4, 2014*

**CRJ**

I think I know the answers could you please tell me if I am right 1. c 2. D 3. B 4. D 5. D 6. B 7. 6. 7. 8. 9. 10.

*May 4, 2014*

**CRJ**

1. Which of the following was an impact on policing as a result of WWII? (Points : 1) The Pendelton Act An increase in educational requirements for police A shortage of experienced officers The adoption of residency requirements for police Question 2. 2. The Pendelton Act of ...

*May 4, 2014*

**LEA201**

Conduct an analysis of community policing with regard to the impacts pertaining to law enforcement administration. Thoroughly compare and contrast the aspects of community policing that are significantly influenced by the public interaction and political influence. As a police...

*May 1, 2014*

**LEA 201**

Conduct an analysis of community policing with regard to the impacts pertaining to law enforcement administration. Thoroughly compare and contrast the aspects of community policing that are significantly influenced by the public interaction and political influence. As a police...

*April 30, 2014*

**statistics**

Which of the following statements is correct? A. An extremely small p-value indicates that the actual data differs markedly from that expected if the null hypothesis were true. B. A large p-value indicates that the data is consistent with the alternative hypothesis. C. The p-...

*April 25, 2014*

**Chemistry**

What mass of NaOH is required to create 500 mL of a .4 M solution of Sodium Hydroxide(aq)?

*February 13, 2014*

**SCIENCE HELP PLEASE**

NO we always see the same side of the moon because its rotational period is the same as its orbital period (about 28 days) if the moon rotated every 24 hrs (like Earth), then you would see different parts of the moon during its orbit

*January 8, 2014*

**math**

Three times as many childeren as adults attended a concert on Saturday. An adult ticket is $7 and a child's ticket is $3. The theater collected $6000. How many people bought tickets?

*November 4, 2013*

**Math**

First take the largest addend which is 37. It takes 3 more ones to make 37 = 40 (37 + 3 = 40). So subtract 3 from 15 (15-3) which give 12. Now add 40 + 12 = 52

*October 23, 2013*

**Math**

the .88 is okay, but the exponent is not actually, there is supposed to be one digit to the left of the decimal point 8.8x10^-3 the exponents are subtracted when dividing (1.23/1.4)x10^(-10 - -8) = .88x10^-2 ___ = 8.8x10^-3

*October 17, 2013*

**Physics**

the net acceleration is ___ g sin(16.9º) - (4.1×103 N / 3.5 × 103 kg) divide the speed at the bottom by the acceleration to get the time for the trip the average speed is (0 + 4.2) / 2 speed times time is distance (the length of the driveway)

*October 17, 2013*

**physics**

the spring compresses until the spring force equals the applied force 14 N = x * 5.0×10^2 N/m

*October 17, 2013*

**physics**

w = 1/2 k x^2 where x is the distance stretched

*October 17, 2013*

**physics**

the component of gravitational acceleration parallel to the slope is ___ g sin(30º) the force on the skier is ___ m g sin(30º)

*October 16, 2013*

**phyics**

with the plane starting from rest and a uniform acceleration, the average velocity is 20 m/s so the time of acceleration is 184/20 or 9.2 s the acceleration is (40 m/s) / 9.2 s

*October 15, 2013*

**physics**

the bank angle provides the necessary centripetal force m * v^2 / r = m * g * sin(θ) * cos(θ) convert v to m/s, then solve for r

*October 15, 2013*

**Math**

there are three pairs of matching sides two are L x W ___ 2 * 7 * 3 two are L x H ___ 2 * 7 * 9 two are W x H ___ 2 * 3 * 9 find the areas, add them together multiply by the paper cost

*October 9, 2013*

**Physics**

the momentum of the system stays constant ___ 94 * .49 forward throw (94 - .27)x + (.27 * 15) = 94 * .49 backward throw (94 - .27)x - (.27 * 15) = 94 * .49

*October 8, 2013*

**college math**

.00001 - .0001 10^-5 - 10^-4 -9x10^-5 ___ -.00009

*September 30, 2013*

**ap chemistry**

a Coulomb ≈ 6.24x10^18 electrons find the number of moles in 96.5 kC (by multiplying) this equals the moles of Ag produced mass = moles * molar mass

*September 28, 2013*

**physics**

your calculated v will be in m/s the question asks for rpm 60 s in a min and circumference = 2πr (60 v) / (2 π r)

*September 28, 2013*

**PHYSICS**

f = m a tension = (3.8 * 2.1) + (3.8 * g)

*September 28, 2013*

**Physics**

the work is equal to the change in the (kinetic) energy of the truck w = (1/2 m 25^2) - (1/2 m 13^2) w = 1/2 * 8000 * (25^2 - 13^2)

*September 28, 2013*

**math**

(15 + 14 + 13 + 12 + 11 + ...) minus (12 + 11 + 10 + ...)

*September 28, 2013*

**Physics**

t is the time for Tina to catch David 1/2 a t^2 = v t 1.45 t^2 = 24 t 1.45 t^2 - 24 t = 0 t = 24/1.45 distance = 24 * 24/1.45 speed = accel * t = 2.9 * 24/1.45

*September 26, 2013*

**physics**

the velocity changes by 9 m/s (27 - 18) this takes approx. 2.6 s (9 / 3.5) the average velocity is 22.5 m/s ___ (27 + 18) / 2 the distance traveled is velocity multiplied by time

*September 26, 2013*

**science**

power = work / time p = (1000 * m * g * h) / (30.0 min * 60 s/min) p = (1000 * 196)j / 1800 s (watts)

*September 25, 2013*

**science**

p.e. = m * g * h 10.3 kj = 5.20 kg * 9.8 m/s^2 * h 10.3 k / (5.2 * 9.8) = h (in meters)

*September 25, 2013*

**Phyics**

the rocket attains a velocity of 75.5 * 1.58 or 119.3 m/s since it started from zero, the average velocity for the 1st part of the flight is 119.3/2 or 59.65 m/s it runs out of fuel at a height of 1.58 * 59.65 or 94.24 m in the 2nd part of the flight, the rocket is decelerated...

*September 25, 2013*

**physics**

the velocity in the x-direction is constant the penguin is accelerated in the y-direction by the wind a = f / m = .45 / 5.7 v = a * t the x-velocity and y-velocity add as vectors to give the net velocity (vx)^2 + (vy)^2 = v^2

*September 25, 2013*

**physics**

push off from your backpack as hard and fast as you can, towards the shore you and your backpack will gain equal amounts of momentum you will slide to solid ground and your backpack will end up on the opposite shore

*September 25, 2013*

**Physics**

the net work done on the car, by the driver, is ZERO the force is applied internally to the moving reference frame of the car this would be like sitting in a wagon and trying to move it by pushing on the inside -- no net work

*September 25, 2013*

**Physics**

the work stretching the spring equals the change in the gravitational potential energy 1/2 * k * x^2 = m * g * x 37 x^2 = 3.3 * 980 * x = 3234 x x^2 - (3234/37)x = 0 x = 3234/37

*September 24, 2013*

**physics**

gravity provides a downward acceleration of 9.8 m/s^2 so the bungee cord is providing an upward acceleration of 1.4 m/s^2 (9.8 - 8.4) the force is upward with a magnitude of 65 kg * 1.4 m/s^2

*September 24, 2013*

**Phyics**

velocity = acceleration * time her acceleration is zero for the rest of the race, so her velocity stays constant

*September 24, 2013*

**Biology**

Describe how enzymes affect chemical reactions and explain why this makes enzymes important to living things. I need help this will be on my test I am studying for.

*August 28, 2013*

**math**

how many ways can a 3 person subcommittee be selected from a committee of 7 people

*July 31, 2013*

**math**

using simple interest on a loan at 8.4% for one year making monthly payments. Find the APR on a $5000 loan.

*July 31, 2013*

**Math**

Heather has divided $8000 between two investments, one paying 8% and the other paying 6%. If the return on her investment is $550 how much does she have in the larger investment?

*July 31, 2013*