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Stuck

Questions and answers by visitors named Stuck

Questions (110)

"The side of an equilateral triangle decreases at the rate of 2 cm/s. At what rate is the area decreasing when the area is 100
1. 7 answers
2. 7,946 views
"What happens to the energy associated with a wave after the wave has been damped out?"I'm assuming all the energy is lost by
1. 3 answers
2. 609 views
"A tank holds 1000L of water, which takes an hour to drain from the bottom of the tank, then the volume V of water remaining in
1. 4 answers
2. 1,689 views
"Margaret has found that by a proper choice of gears she can steadily increase her speed on her bike. One day she sets out and,
1. 5 answers
2. 1,611 views
"At 9am ship A is 50 km east of ship B. Ship A is sailing north at 40km/h and ship B is sailing south at 30km/h. How fast is the
1. 4 answers
2. 3,054 views
"Two springs are hooked together and one end is attached to a ceiling. Spring A has a spring constant of 25N/m, and spring B has
1. 5 answers
2. 3,009 views
Which solution has the lower freezing point?(a) 90.0 g CH3OH in 100. g H2O 180.0 g CH3CH2OH in 200. g H2O (b) 70.0 g H2O in 1.00
1. 1 answer
2. 771 views
Bottles of water are labeled as containing 12 oz. Statistics students weighted the content of 7 randomly chosen bottles and
1. 3 answers
2. 972 views
Two cards are selected without replacement from a standard deck of 52 cards. What is the probability that the first card
1. 4 answers
2. 1,852 views
Eight men enter a doubles tennis tournament in which partners are selected by lot. What is the probability that two brothers,
1. 3 answers
2. 555 views
A pizzeria offers 8 different ingredients on its pizza. Andy chooses 3 different ingredients from the 8 by drawing the names
1. 3 answers
2. 505 views
Three balls are drawn together from a bag containing 4 white, 5 black, and 6 red balls. Find the probability that they include
1. 3 answers
2. 510 views
When using a defibrillator, the doctor usually says "1, 2, 3, clear!" How would you say this expression in French? Do the French
1. 2 answers
2. 1,066 views
How do you say "I'm just kidding" or "I'm just joking" (something along those lines) in French?
1. 5 answers
2. 991 views
Stroke volume is the blood pumped by the left ventricle each time it contracts. During a training run the stroke volume of a
1. 1 answer
2. 448 views
When oxygen uptake is low, a high proportion of the total amount of blood pumped goes to the intestines. When oxygen uptake is
1. 3 answers
2. 535 views
What is the French word for "fashion designer"? There are many words for "designer" in French, but I'm not clear on which one is
1. 7 answers
2. 484 views
During the Italian unification, Garibaldi completed the unification of Southern Italy. I've read several resources, but I'm
1. 5 answers
2. 620 views
What is the function of lactose in the body? I know what lactose is, but I'm having trouble finding if it does anything in the
1. 3 answers
2. 524 views
When given sin(5x)=0, and asked to find x, I would basically have to solve for 5x first, and then divide my answers by 5.My
1. 4 answers
2. 1,332 views
How does x(squareroot)x equal x^(3/2)?I don't understand where the 3 is coming from.
1. 3 answers
2. 351 views
How do you find the moles of excess reactant? I already know the limiting reactant btw.
1. 1 answer
2. 478 views
Thank you Dr Russ for you answer.Anyone who can answer: I have the moles of excess reagent, but now I need to find the
1. 1 answer
2. 472 views
How do I find lim x+4/x-4 as x approaches 4?
1. 2 answers
2. 478 views
How do I find the concentration of the excess reagent?I already have the moles of excess reagent. I'm stuck because I don't know
1. 10 answers
2. 471 views
Why does lim10^(3-x) as x approaches infinity = 0?And why does lim10^(1/x) as x approaches infinity = 1? Are properties of
1. 1 answer
2. 331 views
How do I solve lim((3x^3 - 5x +2)/(4x^2 + 3)) as x approaches infinity?I divided everything by the largest power of x, but I
1. 3 answers
2. 480 views
lim(sqrt(x+1))/(sqrt(4x-1)) as x approaches infinity.
1. 3 answers
2. 680 views
"Translate the empirical molar enthalpy given below into a balanced chemical equation, including the enthalpy change (delta H):T
1. 2 answers
2. 899 views
"Find the total energy lost by the contents of a Styrofoam picnic cooler when a 3.60 kg block of ice placed inside the cooler
1. 3 answers
2. 1,121 views
"Find f'(a) for f(x)=(1+2x)/(1+x)"I got 2, but the answer is 1/(1+a)^2. How do I get that??
1. 4 answers
2. 245 views
"Energy is released when 100 kg of steam at 150 degrees Celsius and standard pressure changes to water at 60 degrees Celsius.
1. 9 answers
2. 944 views
I am designing a lab right now, and I want to know: if I fill a beaker with cold water from the tap and submerge a sample of
1. 3 answers
2. 465 views
If I'm going to transfer a piece of metal (a reasonable size) from a beaker of boiling water into a calorimeter, what should I
1. 4 answers
2. 560 views
If the molecular mass for a chemical is 153.82 g/mol and the enthalpy of formation is -135 kJ/mol, the heat change will be_____
1. 1 answer
2. 419 views
I have a question about uncertainties. For example, I have 1466.5J +/- 0.6J. Do I match the sig digs (in which case it would
1. 1 answer
2. 450 views
Do you need to do uncertainties on percent error? It doesn't make sense to have "percent error on percent error".
1. 2 answers
2. 526 views
"A mass of 45.0g of molten silver at its melting point is poured into 750mL of calorimeter water at 25.0C. The final temperature
1. 4 answers
2. 661 views
"A rectangle is inscribed in a semicircle of radius 2 cm. Find the largest area of such a rectangle".There is a diagram, but I
1. 4 answers
2. 3,445 views
"Colbalt-60 is a radioactive isotope used to treat cancers of the brain and other tissues. A gamma ray emitted by an atom of
1. 4 answers
2. 2,872 views
"If the ovaries were removed between the start of pregnancy and the second month then.....because.....""If the ovaries were
1. 2 answers
2. 734 views
How do I evaluate the limit of e^tan(t) as t approaches pi/2 from the positive side?
1. 1 answer
2. 464 views
During the follicular stage of the menstrual cycle, both FSH and estrogen are high, but aren't estrogen and FSH on a negative
1. 2 answers
2. 649 views
Differentiate x5^sqrt(x).Help please!
1. 5 answers
2. 424 views
"Find the absolute minimum value of the function f(x) = x ln(x)".I know that one of the critical values is 1 (domain
1. 6 answers
2. 852 views
"Suggest two things a large cell might do to increase its surface area:volume ratio".The obvious method would be to divide into
1. 1 answer
2. 1,015 views
"Find the antiderivative of f(x)= (2x)/((x^2)+1)."I understood how to do it with just a number as the numerator, but I can't
1. 1 answer
2. 447 views
"The line x+y = 0 is tangent to the graph of y = F(x). Find F(x) if F'(x) = x".I know how to find the antiderivative of F'(x),
1. 4 answers
2. 814 views
"For which of the following equations is the value of delta H equivalent to the bond enthalpy for the carbon-oxygen bond in
1. 4 answers
2. 1,605 views
"Given that the bond enthalpy of the carbon-oxygen bonds in carbon monoxide and carbon dioxide are 1073 kJ/mol and 743 kJ/mol
1. 6 answers
2. 2,919 views
"Evaluate the following indefinite integrals:"S" (3x^2 -2)/(x^3 - 2x + 1)^3 dx" We're practicing the substitution rule, and I
1. 2 answers
2. 1,043 views
"Find the volume of the solid generated by revolving the region bounded by the graphs of the given equations about the indicated
1. 2 answers
2. 553 views
"Calculate the pH of 0.10 mol/L aqueous solution of aluminum sulfate."I am also given the ka value for the aluminum ion
1. 10 answers
2. 607 views
DrBob, if you're still on...what do I do for NaCl??
1. 1 answer
2. 395 views
"Calculate the pH of NaCl".I know that NaCl is neutral...but I don't know how to show that it is neutral. The ka value for the
1. 4 answers
2. 560 views
"In vase A, there are 3 red balls and 5 white balls. In vase B, there are 6 red balls and 4 white balls. Two balls are to be
1. 4 answers
2. 1,417 views
"The probability of getting heads on a biased coin is 1/3. Sammy tosses the coin 3 times. Find the probability of getting two
1. 5 answers
2. 3,402 views
"Three of the coordinates of the parallelogram STUV are S(-2,-2), T(7,7) and U(5,15). State the vector ST and hence determine
1. 3 answers
2. 969 views
"In the expansion of (2-ax)^5 the coefficient of x^2 is 5. Find the value of a".I know I have to use the binomial theorem to
1. 5 answers
2. 705 views
I am predicting acid-base equilibria using the Brondsted-Lowry predictions. I am asked to do "solid aluminum sulfate added to
1. 4 answers
2. 1,314 views
I am designing a procedure for a lab where I have to use indicators to create an acid-base table from 6 solutions. I am just
1. 3 answers
2. 470 views
Qc for the following chemical reaction3CIO2-(aq)<-->2CIO3-(aq)+Cl-(aq) Choices A:3[CIO2-]/2[CIO3-][Cl} B:2[CIO3-][Cl]/3[CIO2-]
1. 7 answers
2. 661 views
In Act 3, scene 3, Macbeth sends a third murderer to help the other two murder Banquo and his son. Does the third murderer know
1. 1 answer
2. 517 views
"An aqueous sodium borate solution is titrated to the second endpoint with 0.225 mol/l nitric acid in the presence of a suitable
1. 2 answers
2. 635 views
"Evaluate the following indefinite integral using integration by parts:*integral sign* tan^-1(x) dx" I let u = tan^-1(x) and dv
1. 2 answers
2. 625 views
"At 9am ship A is 50 km east of ship B. Ship A is sailing north at 40km/h and ship B is sailing south at 30km/h. How fast is the
1. 2 answers
2. 861 views
"Differentiate x^(x^3)"I can do it when the base is a number, but I'm confused as to how to do it with x as the base.
1. 4 answers
2. 346 views
"The illumination of an object by a light source is directly proportional to the strength of the source and inversely
1. 4 answers
2. 2,254 views
"A diver springs upward with an initial speed of 1.8 m/s from a 3.0 m board. Find the velocity with which the diver strikes the
1. 4 answers
2. 1,460 views
"An object is rolled up an incline. If the object is 2.75 m up the incline after 4.50s and rolling back down at a velocity of
1. 3 answers
2. 974 views
"An airplane is climbing at an angle of 15 degrees to the horizontal with the sun directly overhead. The shadow of the airplane
1. 4 answers
2. 3,776 views
"A person fires a bullet horizontally from a gun at the same instant that another bullet is dropped from the same height as the
1. 3 answers
2. 950 views
"An airplane if flying level at 80.0m above the ground with a speed of 350km/h. The bombardier wishes to drop food and medical
1. 5 answers
2. 954 views
I'm learning about Newton's Laws of Motions and I'm having trouble understanding these questions:"A rear-end collision between a
1. 5 answers
2. 943 views
"A fish hangs from a spring scale supported from the roof of an elevator. If the elevator has an upward acceleration of 1.2m/s^2
1. 5 answers
2. asked by Stuck
3. 5,375 views
"Two girls, one of mass 40kg and the other of mass 60kg, are standing side by side in the middle of a frozen pond. One pushes
1. 3 answers
2. 1,628 views
"A 5000kg helicopter accelerates upwards at 0.50m/s^2 while lifting a 2000kg car. What is the lift force exerted by the air on
1. 4 answers
2. 1,135 views
"A roller coaster reaches the top of the steepest hill with a speed of 1.4m/s. It then descends the hill which is at an average
1. 3 answers
2. 1,151 views
"An athlete whirls a 3.7kg shot-put in a horizontal circle with a radius of 0.90m. If the period of rotation is 0.30s, how far
1. 3 answers
2. 1,956 views
"If a small planet were located 8 times as far as the Earth's distance from the Sun, what would be its period in Earth years?"
1. 2 answers
2. 702 views
"Two masses, 2000kg and 5000kg, are placed 20m apart. A third mass of 5000kg is placed in between the two large masses a
1. 2 answers
2. 1,063 views
"A meter stick is held vertically behind an object on a spring. The object vibrates from the 20cm mark to the 32cm mark on the
1. 1 answer
2. 683 views
"Vibrators A and B are sources of waves with different wavelengths and they are placed close to one another in a ripple tank.
1. 3 answers
2. 1,079 views
"Point S1 and S2 are close sources of circular water waves each of wavelength 6.0cm. P is a point some distance away from the
1. 3 answers
2. 1,133 views
"A wave travels from one medium to another, and the wavelength decreases. What happens to the velocity and the frequency?"I know
1. 4 answers
2. 1,675 views
"Water flows over a section of Niagara Falls at the rate of 1.2*10^6 kg/s and falls 50.0m. How much power is generated by the
1. 4 answers
2. 1,411 views
"Determine the restoring force of a pendulum that is pulled to an angle of 12.0 degrees left of the vertical. The mass of the
1. 1 answer
2. 423 views
"A mass of 3.08kg oscillates on the end of a horizontal spring with a period of 0.323s. What acceleration does the mass
1. 3 answers
2. 548 views
"Two wooden blocks A and B have respective masses of 3.0kg and 4.0kg and are connected with an inextensible cord. If the blocks
1. 3 answers
2. 671 views
"Three forces act at a single point. Two of the forces are 39N southwest and 45N north. What is the value of the third force
1. 3 answers
2. 585 views
"A workman sitting on top of a roof of a house drops his hammer. The roof is smooth and slopes at an angle of 30.0 degrees to
1. 4 answers
2. 2,512 views
"At what point between two masses of 20kg and 15kg located 1.0m apart, will the gravitational field strength equal zero?"
1. 1 answer
2. 426 views
I want to translate this phrase into French:"When I can no longer create anything, I'll be done for." -Coco Chanel How would I
1. 2 answers
2. 594 views
I've been given an article and some questions to answer. One of them is:"Au paragraphe deux que veulent dire les mots... a)
1. 1 answer
2. 386 views
I need an example of the Associative property.
1. 3 answers
2. 294 views
I'm doing a bio lab, and I have collected data on heart rate measured in beats/15 secs with an uncertainty of +/- 1 beat/sec. To
1. 2 answers
2. 1,059 views
I'm doing a bio lab, and I have collected data on heart rate measured in beats/15 secs with an uncertainty of +/- 1 beat/sec. To
1. 1 answer
2. 645 views
Can you show and easy way to show this formula in the form of an equationExample: a = b × r/100
1. 1 answer
2. 274 views
A basketball team recently scored a total of 95 points on a combination of 2-point field goals, 3-point field goals, and 1-point
1. 3 answers
2. 823 views
Calculate the value of q for each of the experiments listed below. (Assume the heat capacity of water is 4.1801 J/g*C).Exp1:
1. 4 answers
2. 2,340 views

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