# science Dr. Bob /Pursley

34,410 results

**Science**

Thanks Bob Pursley!!

**AlgebrAlgebra-Mathmate or BobPursley or Reiny**

I had asked a question earlier and bob pursley nicely answered it but I do have a question concerning it still- perhaps someone could clarify it- f(x) = logx is a logarthmic function. Bob Pursley said it could be because the base is implied but my question is the way it is ...

**science Dr. Bob /Pursley**

this is the chart we were given S = empty square 13 columns Question which elemnts are classified as metals. K S S S S S J S S F S S S S S S S S S D S S R S S S S S S

**Bob Pursley/ Dr.Bob!!!! please help!!!!! CHem!!!!**

What is the molality of the solution when you have 48.2 % by mass KBr aqueous solution ? Show each conversion step

**Thank you!**

BOB pursley

**Bob Pursley**

Bob: Thank you for answering my Chemistry question. I apologize that it was on there twice. I accidentally posted again the same question instead of a different question. You answered the first question with precision. Thank you

**Bob Pursley**

I can not copy and paste to the board.

**Math-can u help me bob pursley???? :)**

Let U = {0, 1, 2, 3, 4, 5,...}, A = {1, 2, 3, 4,...}, B = {4, 8, 12, 16,...}, and C = {2, 4, 6, 8,...}. Determine the following: A′ ∩ C

**Bob pursley**

Sorry I misspelled your name in my previous post:)

**BOBPURSLEY**

ARE YOU A EXPERT TO HELP STUDENTS ON THEIR HOMEWORK LIKE ME? Bob Pursley is actually more than "a expert." He has become one of the leading experts in homework help on the board. So much so that the "International Council on World Homework Online, Learning, Information, ...

**SAT Essay**

Mr. Bob Pursley- You have critiqued multiple essays of mine- is there recurrent mistake that I make? What can I do to make it go from a 5 to 6? Thank you so much.

**anatomy and physiology II**

why does air move into the lungs? Bob Pursley answered this question for you earlier. See you previous post of the same question

**bob pursley- short term long term**

those ideas that you gave me pretty much tell how they are different.. i need how they are similar.. thanks in advance

**ok (my posts mysteriously vanishes...)**

I posted a reply thanking both bobpursley and dr.bob (mild criticism)... I don't see the post. What happened? Was it removed? I saw your post thanking Bob Pursley and me. Many thanks for the thanks. All of us like to think that we lend a helping hand. Both individually and as ...

**Sra Mcgin +bob pursley**

THANKYOU so much for all your help i am sorry that i was going on i was getting confused with the different names. thankyou again i do appreciate it and i am very grateful.

**attention Kuai**

Kuai, your responses are great. If you would like to be a "regular" volunteer here, send a note to me at the contact us button at the bottom of this page. Bob Pursley

**pH- from saturday**

i posted this question previously and got help however im still having some confusion. can u clarify ? what's the pH of the acid HC2H3O2 with concentration of .15? Bob Pursley worked that problem for you and gave it as [x^2/0.15] = Ka. What is it you don't understand? You know...

**science**

Calculate the period of oscillation of a simple pendulum of length 1.8 m, with a bob of mass 2.2 kg. What assumption is made in this calculation? (g = 9.8 m s - 2) If the bob of this pendulum is pulled aside a horizontal distance of 20cm and released, what will be the values ...

**Stats-BOB PURSLEY Help, do you know this?**

Is there a rule to figure out if this is a true or false statement? A sample size of 900 is not large enough to conclude that the sampling distribution of p is a normal distribution, when the estimate of the population proportion is .995.

**Physics**

Thank you so much Mr. Bob Pursley for answer to one of my two questions. Can you please provide me with this answer. My exam is ahead. QUESTION: A rocket is ignited and gone up. After that it returns to the ground. How to draw a displacement time of the same ?

**Elena**

You are posting some good responses, thanks. If you are interested in joining our volunteer staff, on the "contact us" button, write that. I will respond to you via email. We can always use smart folks, interested in helping others. Bob Pursley

**Algebra**

Solve the equation using the Quadratic Formula 5xsquared+13x-6=0 i think it is -2/5,3 5x^2 + 13x -6 (5x -2)(x +3)=0 You are correct. From Bob Pursley's work you can see that his solution gives +2/5 and not -2/5. The +2/5 is correct. drbob is right on that. the solutions are 2/...

**science**

the string of pendulum is 2.0 m long,the bosy is pulled sideway so that the string becomes horizontal and the bob is released what is the speed with which the bob is released ?what is the speed with which the bob arrives the lowest piont?

**science thanks dr bob**

last one thanks dr bob why are nuetrons easier to use for nuclear bombardment than alpha or beta particles

**science process**

I don't no what I must do here: You observed something strenge. You noticed that your pet plant Bob is leaning toward the window in your room. He has been growing toward the window for some time and you wonder why he is doing that. 1.What process will you use to figure out why...

**chemistry**

In precipitating magnesium ammonium phosphate, why can't NH4Cl be used as a substitute for NH3? Isn't pH critical? The solubility is vastly different at pH 9 versus pH 4. In addition, how do you obtain NH3 from NH4Cl? The NH3 is for pH adjustment as Bob Pursley writes.

**Chemistry**

Explain how a non metal atom becomes negative. Lose an electron, become negative. Bob Pursley isn't at his computer right now but I don't think he would mind if I explained that ADDING an electron to a non-metal makes it become negatively charged. I agree with Dr Bob; Losing ...

**HIT**

Dr. Bob's computerized records have been compromised by a hacker, resulting in damages to patients. Which of the following is most true? A. Dr. Bob may be liable if he didn't have proper firewall or other protections. B. Dr. Bob won't be liable. C. Dr. Bob will be liable. D. ...

**science**

bob and sue are initially standing still on frictionless ice. bob weighs 500n . they push against each other and sue acquires an acceleration of 5m/s while bob acquires acceleration of 3m/s. what is sue mass

**Confidentiality of Health information**

Dr. Bob's computerized records have been compromised by a hacker, resulting in damages to patients. Which of the following is most true? A. Dr. Bob may be liable if he didn't have proper firewall or other protections. B. Dr. Bob won't be liable. C. Dr. Bob will be liable. D. ...

**Confidentiality of health information**

Dr. Bob's computerized records have been compromised by a hacker, resulting in damages to patients. Which of the following is most true? A. Dr. Bob may be liable if he didn't have proper firewall or other protections. B. Dr. Bob won't be liable. C. Dr. Bob will be liable. D. ...

**confidentiality of health information**

Dr. Bob's computerized records have been compromised by a hacker, resulting in damages to patients. Which of the following is most true? A. Dr. Bob may be liable if he didn't have proper firewall or other protections. B. Dr. Bob won't be liable. C. Dr. Bob will be liable. D. ...

**Physics-Just a clarification**

I have a question? What does hf = hi+Vivertical stand for? I haven't seen hf or hi or Vivertical yet in class-I just started a few weeks ago. Bob Pursley answered a question but I don't know what the abbreviations mean. Thank you for the direction-

**health**

Dr Bob's computerized records are damaged by a power surge,Which of the following is true? a) Dr Bob is not at fault b)Dr bob is at fault c)The records custodian, but not dr bob will be liable d)dr bob is at fault unless he had proper surge protection devices in place

**Math (Bob Pursley**

i asked about stationary points which came out at (x-3) and (x+1) i am now trying to use the first derivative test to classify the left hand point... (x-3) so picking an xL point of -4 and an xR point of -1 i get this f ' (-4) = 3 16 - 4 + 9 = 48 - 24 + 9 = 33 >0 f ' (-1...

**sorry *Mr. Pursley**

Mr. Pursley

**science**

tThe bob of a pendulum swings through a circular arc of constant radius. At what point of the swing does the cord holding the bob exert the greatest entripetal force on it?

**chemistry**

A 100.0 mL portion of 0.250 M calium nitrate solution is mixed with 400.0 mL of .100M nitric acid solution. What is the final concentration of the nitrate ion? BOB PURSLEY PLEASE EXPLAIN MORE THOROUGHLY HOW YOU GOT THE NITRATE ION TO BE .5M

**Health info**

please check my answer thanks :) Mr. Jones, angry at Dr. Bob , throws a punch at him but misses. Dr Bob sues for battery. why will Dr Bob lose? 1.There was no physical contact 2. Dr Bob was not harmed I picked #1 no physical contact

**physiology**

Study guide question...please help Bob attends a party. a few hours before the party, Bob ate beans and cabbage. His best friend made a funny joke and Bob finds it funny and his abdominal muscles begin to contract forcefully as he laughs. Physiologically, what happens next to ...

**physics**

A metal Bob of mass0.6kg is attracted to the end of a string of length1m.the Bob is whirled in a horizontal circle with a uniform speed of12m/s.what is the centripetal force acting on the Bob .if the speed of the Bob is5m/s Calculate the tension of the string.?

**Anatomy and Physiology**

Mr. Jones, angry at Dr. Bob, throws a punch at him but misses. Dr. Bob sue for battery. Why will Dr. Bob lose?

**To Jessica**

Sorry, but I made two errors. Monocalcium phosphate is monocalcium monohydrogen phosphate which is CaHPO4. The Ca is +2, H is +1, and PO4 is -3 so the +3 and -3 balance. And Bob Pursley did NOT suggest that name of monocalcium dihydrogen phosphate, he was answering a question ...

**Equivalent Fractions**

what or how do you get at least one equivalent fraction 1/4 = ___ what about 30/120 ? I don't know.. How did you get that? Multiply the numerator and denominator by the same number. 1/4 = 2/8 = 3/12 = 4/16 = 5/20 If you multiply the numerator and denominator of 1/4 by 30, you'...

**science**

I see others have asked the same question but I do not understand the answers given. Question is to do with zinc solid and dilute sulphuric acid. What substance is left? I see by other posts that Bob Pursley answered this question. I haven't seen his answer but here is a hint...

**english**

Can someone explain to me what a sub claim is and give me an example All I can find is that it is a part, or claim on an argument. Example: Bob Pursley is growing senile.....arguement He eats unpeeled bananas sub claim He does not look back when backing..subclaim He cant keep ...

**GOVERNMENT HELP**

Where did classical liberalism start? I know it started in Europe but was it Britain or France or both? I merely want to check my work. Bob Pursley do not answer this since you are so rude by suggesting that I want you to do my homework for me. http://en.wikipedia.org/wiki/...

**PHYSICS HELP**

If the external world does work on the system, the quantity of work is negative or positive? I said it was positive and Bob Pursley said I was right, but a Physics student said that it is negative. Please help if you can..

**math**

Bob sets two alarm clocks (battery-powered) to be sure he arises for his Monday 8:00 A.M. accounting exam. There is a 75 percent chance that either clock will wake Bob. (a) What is the probability that Bob will oversleep? (b) If Bob had three clocks, would he have a 99 percent...

**Health Information**

Dr. Bob's computerized records are damaged by a power surge. Which of the following is most true? A. Dr bob isn't at fault. B. Dr Bob is at fault. C. The records custodian, but not Dr bob will be liable. D. Dr Bob is at fault unless he had proper surge protection devices in ...

**discrete math**

If a and b are positive integers, and m=lcm(a,b), explain why m divides any common multiple of a and b. The answer is in the definition of lcm:] the smallest multiple that is exactly divisible by every member of a set of numbers. So if m is divisble by a or b, then ab divides ...

**chemistry**

How many grams of water would you add to 1.00 kg of 1.48 m CH3OH(aq) to reduce the molality to 1.00 m CH3OH. Use two sig figs. I get 4.8 * 10^2 grams and its not right. I want to put this up here again to see if there are any errors that could have possibly been made. (Putting...

**bus math 12**

Challenge Problem: Bob is closing a real estate transaction on a farm in Yocona, Mississippi, for $385,900. His mortgage holder requires a 25% down payment and he also must pay $60.00 to record the deed, $100 in attormey's fees for document preparation, and $350 for an ...

**Math**

Bob can swim at a rate of 5km/h. He is in a river that is flowing at a rate of 9 km/h. a) if bob swims upstream, what is his relative velocity to the ground? b)if bob swims downstream, what is his relative velocity to the ground? c) Someone decides to help Bob out of the water...

**physics**

Bob can swim at a rate of 5km/h. He is in a river that is flowing at a rate of 9 km/h. a) if bob swims upstream, what is his relative velocity to the ground? b)if bob swims downstream, what is his relative velocity to the ground? c) Someone decides to help Bob out of the water...

**Calculus and vectors**

Bob can swim at a rate of 5km/h. He is in a river that is flowing at a rate of 9 km/h. a) if bob swims upstream, what is his relative velocity to the ground? b)if bob swims downstream, what is his relative velocity to the ground? c) Someone decides to help Bob out of the water...

**science**

A simple pendulum of length 1 metre has a bob of mass 100 grams.It is displaced through an angle 60 degree and then released.Calculate the speed of the bob when the pendulum passes through the mean position.

**Biology**

Please help !!!! two bacteria, "Claire" and "Bob" are infected with a virus. Claire explodes several hours later and Bob lives happily ever after.... until one day when Bob feels stressed out and all the sudden, explodes as well. What happened to bacteria "Claire" and "Bob" ...

**Physics**

The pendulum bobs in the figure are made of soft clay so that they stick together after impact. The mass of bob B is 14 times that of bob A. Bob B is initially at rest. If bob A is released from a height h above its lowest point, what is the maximum height attained by bobs A ...

**HEALTH**

Dr bob's computerized records have been compromised by a virus, resulting in damages to patients. Which of the following is most true? a) Dr bob will not be liable. b) dr bob will be liable. c) dr bob won't be liable if the virus was introduced by someone outside office d) dr ...

**PHYSICS**

Fig. 6-48 shows a conical pendulum, in which the bob (the small object at the lower end of the cord) moves in a horizontal circle at constant speed. (The cord sweeps out a cone as the bob rotates.) The bob has a mass of 0.038 kg, the string has length L = 1.2 m and negligible ...

**statistics**

Bob is a salesman. He receives $20 for each sales plus a fixed salary of $100 per week. Bob's average weekly sales is 70 units with a standard deviation of 15. Bob works 45 weeks a year.

**question**

two friends bob and ralph, ate at a restarunt together. bob paid for himself and ralph paid for himself. Bob spend 3 dollars more than ralph. the total bill was 52.24 dollars how much did bob pay?

**physics**

The figure below shows a "conical pendulum", in which the bob (the small object at the lower end of the cord) moves in a horizontal circle at constant speed. (The cord sweeps out a cone as the bob rotates.) The bob has a mass of 0.035 kg, the string has length L = 0.90 m and ...

**physics**

Figure 6-43 shows a "conical pendulum", in which the bob (the small object at the lower end of the cord) moves in a horizontal circle at constant speed. (The cord sweeps out a cone as the bob rotates.) The bob has a mass of 0.060 kg, the string has length L = 0.90 m and ...

**Biology Expert needed**

Here at Jiskha, we operate with volunteers to assist students. We are great need of a biologist or certified teacher in biology. If you are interested in this volunteer work, please indicated so at http://www.jiskha.com/contact/ thank you so much. Bob Pursley

**Health Law**

please check my answer thannks :) Dr Bob is on the staff at Patient hospital ,Inc he commits malpractice the plaintiff sues both the hospital and Dr Bob Assuming no fault on the part of the hospital which is the most complete and true.. 1. the hospital is liable 2. both Dr Bob...

**physics**

Alice ((7.500x10^1) kg) and Bob ((8.5x10^1) kg) are standing at rest on friction free ice. Alice pushes Bob causing Bob to accelerate at (2.300x10^0) m/s^2. What is the magnitude of Alice’s acceleration?

**Physics**

A 2.1 kg pendulum bob hangs from a 2 meter string. It is pulled to the side, position A, so that the bob is 79 cm (h on the sketch) above the lowest position, position C. The bob is released and begins to swing. See below.

**Physics**

Bob has just finished climbing a sheer cliff above a beach, and wants to figure out how high he climbed. All he has to use, however, is a baseball, a stopwatch, and a friend on the ground below with a long measuring tape. Bob is a pitcher, and knows that the fastest he can ...

**physics**

A frictionless pendulum is made with a bob of mass 19.7 kg. The bob is held at height = 0.934 meter above the bottom of its trajectory, and then pushed forward with an initial speed of 2.93 m/s. What amount of mechanical energy does the bob have when it reaches the bottom?

**Q. Research**

3. Bob takes an online IQ test and finds that his IQ according to the test is 134. Assuming that the mean IQ is 100, the standard deviation is 15, and the distribution of IQ scores is normal, what proportion of the population would score higher than Bob? Lower than Bob?

**Statistics**

Bob takes an online IQ test and finds that his IQ according to the test is 134. Assuming that the mean IQ is 100, the standard deviation is 15, and the distribution of IQ scores is normal, what proportion of the poulation would score higher than Bob? Lower than Bob?

**statisitics**

ƒæ Bob takes an online IQ test and finds that his IQ according to the test is 134. Assuming that the mean IQ is 100, the standard deviation is 15, and the distribution of IQ scores is normal, what proportion of the population would score higher than Bob? Lower than Bob?

**physics**

A 2.1 kg pendulum bob hangs from a 2 meter string. It is pulled to the side, position A, so that the bob is 125 cm (h on the sketch) above the lowest position, position C. The bob is released and begins to swing. How fast is it moving at that point?

**physics**

i know how to do it, i keep getting the wrong answer!! a bob of mass 4.00 kg is suspended from a fixed point by a massless string of length 1.50 m. The bob moves in a horizontal circle with the string always making an angle theta=22 from the vertical. what is the speed of the ...

**Physics based Calculus**

Bob has just finished climbing a sheer cliff above a beach, and wants to figure out how high he climbed. All he has to use, however, is a baseball, a stopwatch, and a friend on the ground below with a long measuring tape. Bob is a pitcher, and knows that the fastest he can ...

**health**

Paula Patient doesn't want her violent boyfriend to know she's getting an abortion, so she asks Dr. Bob to send all communications to her to a post office box and to phone her only at work. What should Dr. Bob do, and what is the legal basis for your advice? If she tells Dr. ...

**medical**

paula patient doesn't want her violent boyfriend to know she's getting an abortion, so she asks dr. bob to send all communications to her to a post offfice box and to phone her only at work. what should dr. bob do, and what is the legal basis for your advice? if she tells dr. ...

**Health**

Paula Patient doesn't want her violent boyfriend to know she's getting an aboution, so she asks Dr. bob to send all communications to her to a post office box and to phone her only at work. What should Dr. Bob do, and what is the legal basis for your advice? if she tells Dr. ...

**Physics**

A pendulum bob is released from some initial height such that the speed of the bob at the bottom of the swing is 1.5 m/s. The acceleration of gravity is 9.81 m/s 2 . What is the initial height of the bob? Answer in units of m

**English**

1. Bob is 4 cm shorter than Emily. 2. Mr. Pitt is 16 kg heavier than Emily. 3. Emily is 1 year younger than Bob. 4. Bob weighs 4kg more than Emily. (Are the expressions correct grammatically?)

**introductory to physics**

A pendulum bob is released from some initial height such that the speed of the bob at the bottom of the swing is 4.0 m/s. The acceleration of gravity is 9.81 m/s 2 . What is the initial height of the bob? Answer in units of m

**physics**

A pendulum bob is released from some initial height such that the speed of the bob at the bottom of the swing is 3.2 m/s. The acceleration of gravity is 9.81 m/s 2. What is the initial height of the bob?

**Please check my solution bob pursley or drwls if a**

If I had the old-fashion camera that had a focal length of 35mm(0.035m) and I take a picture of a person 6 m away, how far does the film need to be from the lens to record a clear image? I know that the equation is 1/f = 1/d(object) + 1/d(image) so would I do the following: 1/...

**Introduction to the Criminal Justice System**

Is Common Law, Statute, and Jurisdiction sources of Criminal Law? What I have is, almost all criminal prosecutions today are based on criminal laws defined by statute rather than by the common law. That is true, because punishment is clearly stated in statue. Common law often ...

**MircroEconomics - Production & Cost**

Please check my answers if they are correct! If not, please make corrections. Thank you! Bob, owner of Bob’s Auto, sells cars. The number of car sales is represented by y. Bob buys autos at a price of A each and has no other costs. He only buys as many cars as he sells. a) ...

**health information**

Paula Patient doesn't want her violent boyfriend to know that she's getting an abortion, so she asks Dr. Bob to send all commmunications to her to a post office box and to phone her only at work. What should Dr. Bob do, and what is the legal basis for your advice? If she tells...

**health information**

Paula Patient doesn't want her violent boyfriend to know she's gettin an abortaion, so she asks Dr. Bob to send all communications to her to a post office box and to phone her only at work. What should Dr. Bob do, and what is the legal bases for your advice? If she tells Dr. ...

**Quantum Physics**

Alice and Bob share a state a|++> + b|-->, where the first qubit is Alice's and the second qubit is Bob's. Alice measures her qubit in the standard basis and sends the measurement outcome to Bob. If Bob wants his qubit in a|+> + b|->, what gate does he apply in the...

**physics**

¬Calculate the period of oscillation of a simple pendulum of length 1.8 m, with a bob of mass 2.2 kg. What assumption is made in this calculation? (g = 9.8 m s - 2) If the bob of this pendulum is pulled aside a horizontal distance of 20cm and released, what will be the values...

**Physics**

A pendulum bob is released from some initial height such that the speed of the bob at the bottom of the swing is 1.9m/s. What is the initial height of the bob?

**Confidentiality of Health Information**

Paula Patient doesn’t want her violent boyfriend to know she’s getting an abortion, so she asks Dr. Bob to send all communications to her to a post office box and to phone her only at work. What should Dr. Bob do, and what is the legal basis for your advice? If she tells ...

**Health Care**

Dr. Bob's computerized records are damaged by power surge. I am saying that Dr. Bob is at fault unless he had proper surge protection devices in place. My friend is saying that the record custodian, but not Dr. Bob wil be liable. HELP

**health**

Bob was given and exercise prescription for 3-5 METS for his home exercise program. He is currently walking, and at the fitness center using a treadmill, walking 3.2 mph up a3% incline. Bob weighs 70kg. is Bob exercising in his prescribed zone?

**physics**

A certain pendulum with a 1.00 kg bob has a period of 3.50 s. What will happen to the period of the pendulum if the 1.00 kg bob is replaced by a bob with a mass of 2.00 kg? Explain your answer.

**physics**

Suppose we have Bob the astronaut sitting without a space suit in a spaceship full of air on a mission to Mars. Bob is very fond of balloons and is holding on to a nice, big, red helium balloon via a piece of string. Bob is sitting facing the front of the spaceship. Mission ...

**Maths**

Tom has more money than Bob. If Tom gave Bob R20 , they would have the same amount. While if Bob gave Tom R22 , Tome would then have twice as much as Bob. How much does each one actually have?

**Physics**

A pendulum bob has a mass of 1kg. The length of the pendulum is 2m. The bob is pulled to one side to an angle of 10degree from the vertical. What is the velocity of the pendulum bob as it swings through it's lowest point? What is angular velocity?

**BOB PURSLEY PLEASE HELP**

What is the electrostatic force between one object with a charge of +5.0 × 10−6 C, and a second object with a charge of +2.0 × 10−6 C? The objects are 1.2 meters apart. In a pith ball experiment, the two pith balls are at rest. The magnitude of the tension in ...