# Posts by bob

Total # Posts: 3,303

**physics**

In baseball, a pitcher can accelerate a 0.15 kg ball from rest to 99 mi/h in a distance of 1.4 m. What is the average force exerted on the ball during the pitch?

**chemistry**

1. From Thomson's work, which subatomic particle do you think he would feel are most important for the formation of compounds? Why? 2. Of the remaining two other kinds of subatomic particles, which do you think would take second place in importance? Why? 3. Give three ...

**Math**

Right answers ^

**Math Studies IB**

I am trying finding whether men or women have better memory. I would like to do a chi-squared test, how would i lay it out and What other sophisticated processes can i do?

**physics**

A vector has a magnitude of 17.6 cm and makes an angle of 150.0° with the positive x-axis. What are the x- and y-components of this vector?

**chemistry**

I am stuck in the following in my homework. BaC/2 and Na2CO3 turns different colors when the same indicator is added to each? Why does this happen? How is the ph of each of these different? I have tried on this one and cannot get it. Thanks for our help. Bob

**chemistry**

I am stuck in the following in my homework. BaC/2 and Na2CO3 turns different colors when the same indicator is added to each? Why does this happen? How is the ph of each of these different? I have tried on this one and cannot get it. Thanks for our help. Bob

**chemistry**

I am stuck in the following in my homework. BaC/2 and Na2CO3 turns different colors when the same indicator is added to each? Why does this happen? How is the ph of each of these different? I have tried on this one and cannot get it. Thanks for our help. Bob

**chemistry**

Thank you Dr.! So sorry, I typed a slash instead of an l; too many hours at this. In looking at this, i get it now. Thank you for such a complete answer. Bob

**chemistry**

I am stuck in the following in my homework. BaC/2 and Na2CO3 turns different colors when the same indicator is added to each? Why does this happen? How is the ph of each of these different? I have tried on this one and cannot get it. Thanks for our help. Bob

**Chemistry**

jk

**history**

Does a propaganda poster have to be opposing the cause? for example, propaganda poster for the 2012 elections Would this work... If i made some kind of propaganda poster to make people want to vote for Obama? (like some vote for obama propaganda poster)...Of would that not ...

**Math Help**

1.b 2.d 3.a 4.d 5.b 6.c 7.b 8.a 9.b 10.b 11.b 12.b 13.d 14.b 15.c

**math**

2/3x3/5

**Algebra**

three numbers are such that the second is the difference of three times the first and 6 while the third is the sum of 2 and 2/3 the second. The sum of the three numbers is 172. Find the largest number.

**i don't understand this math**

4 is C

**English**

To my dear loving wife

**science**

jasie traveled 500m at a speed of 13 miles how long did it take her?

**algebra**

In 2000, 49% of the residents in a large city regularly used newspapers for getting news and this has decreased at an average rate of approximately 1.3% per year since then. Find a linear function in slope-intercept form that models this description. The function should model ...

**Math**

write a number that rounds to 47,000 when rounded to the nearest thousand and to 50,000 when rounded to the nearest ten thousand.

**5th grade religion**

All men.

**physics**

You drop a stone into a deep well and hear it hit the bottom 4.40 s later. This is the time it takes for the stone to fall to the bottom of the well, plus the time it takes for the sound of the stone hitting the bottom to reach you. Sound travels about 343 m/s in air. How deep...

**Physics**

A shopper pushes a cart 50 m south down one aisle and then turns 90.0° west and moves 19 m. He then makes another 90.0° turn and moves 13 m. (a) What is the largest possible displacement of the shopper? (b) What is the smallest possible displacement of the shopper? ...

**equations**

2 pennies

**Chemistry**

If a soft-drink bottle whose volume is 1.50 is completely filled with water and then frozen to -10 , what volume does the ice occupy? Water has a density of 0.997 at 25 ; ice has a density of 0.917 at -10 . Could you also explain the steps as to how I would go about solving ...

**social studies**

which of these is not like the others 1.John Winthrop 2.James Oglethorpe 3.William Penn 4.Roger Williams I think that it would be John Winthrop because all the rest started colonies which later became state names but i don't think that is sufficient evidence

**Math**

You invested $14,000 in two accounts paying 5% and 9% annual interest, respectively. If the total interest earned for the year was $820, how much was invested at each rate?

**physics**

20km

**physics**

7920

**Social Studies**

Ms. Sue I only a few a few more sentences could you please help me?? I think oil is more important to Southwest Asia than water. It has increased their wealth and standard of living. It is also the main export in Southwest Asia and has provided work for many people.

**Social Studies**

sorry the second oil is supposed to be water

**Social Studies**

Why is oil more important than oil in the middle east and southwest asia? 5-7 sentences

**Math**

10/15 * 9/14 * 5/13 = 15/91 = 0.165 (3sf)

**health**

??????

**Statistics**

An instructor has graded 25 exam papers submitted by students in a class of 26 students, and the average so far is 71. (The maximum possible score is 100.) A) To raise the class average by 1 point, the score on the last paper has to be:

**biology**

darkies

**biology**

dorkies

**biology**

sorry babe gosh

**Science**

please help

**Science**

Imagine you are a plant. How are you and your cells different than animals. 1/2 - 3/4 page

**Alegebra 1**

there are no equations

**Algebra2**

I'm Doing Problem 2 Right Now . But I'm Stuck How Did You Get 150 In the 3rd Line?

**Algebra2**

Help Please? 1.30√-25 x 8√-49 2. 6√-64 + 12√-36 3. 4√-13 - 6√-13

**Algebra2**

Help Please? 1.30√-25 x 8√-49 2. 6√-64 + 12√-36 3. 4√-13 - 6√-13

**Math**

Two airplanes at 25,000 ft above the ground are flying toward the same airport.Airplane A is flying due south towards the airport at 200 miles per hour.At 10:00 AM Airplane A is 700 miles from the airport,and Airplane B is 925 miles from the airport.How far are the two ...

**Math**

in a hardware store the ratio of shovels to rake is 3:5.If there are 10 more rakes than shovels how many rakes are there in the hardware store?

**Math**

the choices r 2 3 4 5 6

**Math**

When 17 is divided by k,where k is a positive integer less than 17,,the remainder is 3.What is the remainder when the sum of the possible values of k is divided by 17?

**Math**

If x<-x, then a)x>0 b)x<0 c)x=0 d)1/x>0 e)x^2<0

**health**

Are you sure ???

**physics**

two objects are thrown from the top edge of a cliff with a speed of 10 m/s. one object is thrown straight down and the other straight up. if the first object hits the ground in 4.0 second, the second hits the ground in ________ seconds after the first object.

**Math**

B?

**Math**

If a=3^2, b=1/a and c=b^4 then a) a>b>c b) a<b<c c) a<c<b d) c<a<b e) b<c<a

**Math**

If n!/2=(n-2)! then n=?

**english**

hey your from connections academy!

**Health**

WHAT IS IT !!!!!

**math grade 12**

also what kind of function is this?

**math grade 12**

where did you get 1.015 from in the first equation?

**math grade 12**

Mr. Currie pours himself some coffee into a paper cup before making his way to the amusement park. The coffee temperature is 350C when the cup is placed on the kitchen counter with room temperature of 20o C. Mr. Currie was called to the phone for last minute arrangements, and ...

**Maths**

solve |x^2-5|=5x+9 please explain step by step how to get to the answer

**Science**

A car's engine is only 12% efficient at converting chemical energy in gasoline into mechanical energy. If it takes 1.8 x 104 N of force to keep the car moving at a constant speed of 21 m/s, how much chemical energy would be needed to move the car a distance of 450 m at ...

**Physics**

A 4.0 x 101 kg wind sled is gliding East across a frozen lake at a constant speed of 12 m/s, when a gust of wind from the southwest exerts a constant force of 1.0 x 102 N on its sails for 3.0 s. With what velocity will the sled be moving after the wind has subsided?

**Physics**

A rock climber of mass 55 kg is hanging suspended from a rope tied to another climber of mass 65 kg on a horizontal cliff ledge. If the coefficient of kinetic friction between the climber on the ledge and the ledge is 0.45, what is the net acceleration of the climber on the ...

**Calculus**

i feel like you solved for when the stadium holds 59000 not 53000 like in his question hahaha WHICH IS PERFECT BECAUSE MY PROBLEM IS WITH 59000! yay :)

**Computers**

We are not here to do your homework for you, just to help.

**Math**

1/5

**Grammar**

Thanks Ms. Sue! I'm just going to continue to use it so no one will be confused. I must ask, since I've used this site for years and love it, how did you come about to working here? Or is this all volunteer work? I see you, Dr. Bob, and some other people haven't ...

**Grammar**

Lately when I've been reading news articles and website blogs, I've been seeing some funny grammar that I don't remember learning about. It deals with commas for a list of items. Normally I thought you would write like this: I have potatoes, carrots, and squash ...

**Trig**

find all solutions to the equation √3 csc(2theta)=-2 Would the answer be π/6 + 2πn, 5π/6 +2πn or π/6 + πn, 5π/6 +πn? or neither?

**math**

What annual interest rate was charged on a 2-year loan of $6300 if the simple interest paid was $1039.50? Show your work

**American History**

Examine the effects of World War II on the American family

**Math**

Webster Aquatic Center offers various levels of swimming lessons year-round. The March 2005 Monday and Wednesday evening lessons included instructions from Water Babies through Adults. The number in each classification is given in the table that follows. Swim Lesson Types No. ...

**Trig**

From a point P on level ground, the angle of elevation of the top of a tower is 27°10'. From a point 23.0 meters closer to the tower and on the same line with P and the base of the tower, the angle of elevation of the top is 51°30'. Approximate the height of ...

**U.S. GOVERNMENT**

A A

**algebra**

the senior class at highschool a and highschool b planned separate trips to the local amusement park the senior class at highschool a rented and filled 5 vans and 8 buses with 357 students highschoolb rented and filled 10 vans and 5 buses with 285 students every van had the ...

**STATS**

84

**english**

how do i write a thesis

**math**

what is 984 times 4 squared?

**chemistry**

is scraping of cheek cells an effective way to find if you have lung cancer?

**science - chemistry**

How much limestone will you need to neutralize lakes, using Snells law formula, and how would you draw that out?

**Fluid Mechanics**

Water enters a turbo-machine at a velocity 12 ft/s. The flow occurs in the horizontal plane. The inside diameters of the inlet and exit pipes are 1 ft and 2 ft, and the gage pressures at the inlet and exit are 10 psi and 5 psi, respectively. The machine is anchored at the ...

**Fluid Mechanics**

The gate OAB under water is 5 m-wide and is hinged along O as shown. (a) Find the hydrostatic force on the horizontal surface AB. (b) Determine the magnitude and point of action of the hydrostatic resultant force on the vertical surface OA. (c) Draw a free body diagram of the ...

**Fluid Mechanics**

Water at 600F flows steadily through a horizontal circular divergent duct and discharges into the atmosphere as shown. A manometer with a fluid of SG=2.0 is placed between the two cross-sections with diameters D1 = 0.5 ft and D2 = 0.7 ft. Assuming inviscid flow, determine: (a...

**Fluid Mechanics**

The components and their dimensions of a hydraulic jack are shown in the figure. The specific gravity of the fluid in the jack is SG=0.8. A force F=400 N is applied at the left end of the handle, which is hinged at the right end. Determine: (a) The fluid pressure p1 on the ...

**physics**

When chasing a hare along a flat stretch of ground, a greyhound leaps into the air at a speed of 10.2 m/s, at an angle of 16.3° above the horizontal. (a) What is the range of his leap? (b) For how much time is he in the air?

**Physics**

The Builder

**Physics**

At what angle to the surface must a submerged diver in a lake look toward the surface to see the setting sun just along the horizon?

**Physics**

A crown glass plate 2.5 cm thick is placed over a newspaper. How far beneath the top surface of the plate would the print appear to be if you were looking almost vertically downward through the plate?

**Physics**

A person lying at poolside looks over the edge of the pool and sees a bottle cap on the bottom, directly below. If the depth of the pool is 3.2 m, how far below the water surface does the bottle cap appear to be?

**statistics**

25

**Physics**

A man who is 6 ft tall is standing in front of a plane mirror that is 2 ft in length. If the mirror is placed lengthwise with its bottom edge 4 ft above the floor on a wall that is 5 ft away, how much of his image (i.e. what length of himself) can the man see? (Assume that his...

**Physics**

A man who is 6 ft tall is standing in front of a plane mirror that is 2 ft in length. If the mirror is placed lengthwise with its bottom edge 4 ft above the floor on a wall that is 5 ft away, how much of his image (i.e. what length of himself) can the man see? (Assume that his...

**Physics**

A man who is 6 ft tall is standing in front of a plane mirror that is 2 ft in length. If the mirror is placed lengthwise with its bottom edge 4 ft above the floor on a wall that is 5 ft away, how much of his image (i.e. what length of himself) can the man see? (Assume that his...

**Physics**

A man who is 6 ft tall is standing in front of a plane mirror that is 2 ft in length. If the mirror is placed lengthwise with its bottom edge 4 ft above the floor on a wall that is 5 ft away, how much of his image (i.e. what length of himself) can the man see? (Assume that his...

**Physics**

Standing 2.5 m in front of a plane mirror with your camera, you decide to take a picture of yourself without turning the camera around. To what distance should the camera be focused to get a sharp image?

**Physics**

A dog is sitting in front of a plane mirror. At a command it jumps at the mirror with a speed of 0.50 m/s. How fast does the dog approach its image?

**math**

At his school’s field day, 7 of Jake’s classmates won a bronze trophy, 14 won a silver trophy, and 10 won a gold trophy. If you choose one trophy winner at random, what is the probability that you would choose someone who won a bronze trophy?

**Physics**

You are heating water in a pot on the stove. Shortly before the water boils properly, bubbles of steam begin rising from the bottom of the pot but vanish before they reach the water’s surface. What happened to those bubbles?

**Physics**

At a restaurant, your glass of water contains 25% ice while your friend’s glass of water contains 75% ice. What can you say about their temperatures? Explain your answer