# Posts by bob

Total # Posts: 3,273

**Physics**

If you've ever watched sailing, you will sometimes see a sailor hanging off the side of the boat, for example in this shot from the movie "The Thomas Crown Affair." Eventually, of course, the sailboat tips over so far that a person cannot keep it balanced. ...

**Physics**

Climbing to the top of Mount Everest is hard. But, it's slightly easier than you might think as people weigh less as they climb to the top. Let WE be a person's weight on top of Mount Everest and WS be their weight at sea level. What is the value of 1−WE/WS? ...

**Math (Percent discount)**

With the holiday approaching, Nancy's Closet is having a sale, where all their clothes are 40% off. Mary, who works there, can get a further staff discount of 30% off the sale price. What is the total percent discount that Mary gets?

**algebra 2**

During the first part of a trip a canoeist travels 26 miles at a certain speed. The canoeist travels 8 miles on the second part of the trip at a speed 5 mph slower. Total time is 3 hours. What was the seed on each part of the trip

**Physics**

voltage

**physics**

hi answer is pi

**Calculus**

actually theres an integral sign. at the top of the sign theres a 3. At the bottom of it, theres a 2.

**Calculus**

∫3 at top and 2 at bottom x/x^2+1 dx = ? if you could show steps that would be great thanks

**Math**

4

**science**

Calculated how many grams of methane (CH4) are in a sealed 80 mL flask at room temperature (22ºC) and 780 mm Hg of pressure. Show all your work.

**Physics**

A small statue has a height of 3.8 cm and is placed in front of a concave mirror. The image of the statue is inverted, 1.9 cm tall, and located 14 cm away from the mirror. Find the focal length of the mirror.

**math**

suppose your salary was 28,500 in 2010 and 32,000 in 2016. Assume your salary follows a linear growth pattern.

**Chemistry**

14.5

**Physics**

The world record for revolutions per minute for an ice skater is 308 RPM, held by Natalia Kanounnikova. You can see a video of the spin here. When she starts the spin and her leg is extended, she's going somewhere between 1-2 revolutions per second. Let's average this ...

**Physics**

You wish to swim across a small river to your friend on the other side. The river is 30 m wide and you begin to swim straight across it at a speed of 1 m/s. The current in the river is 0.5 m/s and so the river carries you downriver as you swim. How far downriver in meters are ...

**Physics**

Recently there has been technological advances that allow for 3-D imaging up to kilometers away from an object. This can be done by using laser light that bounces off an object. By measuring the time it takes the laser light to get to the object and back, one can construct a ...

**math**

what is the formula to calculate the area of a trapziode.

**math**

8.27

**Calculus (Gr.12) Math**

I am not sure how to do this question I know I have to take the derivative but then I am left w/ to unknowns. If a projectile is shot up hill the distance (range) of the landing point up the hill depends on the initial speed of the projectile,v, the angle of inclination, a, ...

**Quantum Physics**

8D ,8E,6C,6D and 9

**ap calculus**

a particle moves along the x axis in such a way that its acceleration at time t, t>0 , is given by x(t)= (ln x)^2. at what value of t does the velocity of the particle attain its maximum

**help with chemistry**

Uranium hexafluoride is a solid at room temperature, but it boils at 56°C. Determine the density of uranium hexafluoride at 67°C at 759 torr. ___g/L I got 12.7 i do not know if this is correct. Please help

**college algebra**

solve the equation 8^x=2

**Math (Combinatorics)**

A newly designed international airport is planning to label its gates. Each gate must be assigned a letter from the alphabet from A to M (13 in all), and a number from 1 to 15. To avoid confusion, any two gates must be assigned a different letter, or a different number (or ...

**Physic 30**

14.77

**science**

1mole of liquid water at 25 c and 1 atm forms 1 mole of steam at 100 c and 1 atm. the molar heat capacity of water 373 k is 40.79kj/mol and the molar heat capacity of water is 75.3 J. assume ideal gas behavior for steam. Calculate delta U, delta H and delta S

**Math**

-5(t-8)-(t+7)=6

**math**

The real answer is 69

**algebra1**

explain in more detail plz

**english**

can you help me find facts and figures why teens should voulunteer if possible how many teens like volunteering i apreciate your help.

**math**

15.2

**economics**

Maria can read 20 pages of economics in an hour. She can also read 50 pages of sociology in an hour. She spends 5 hours per day studying. a. Draw Maria's production possibilities frontier for reading economics and sociology. b. What is Maria's oppurtunity cost of ...

**MATH**

yo waz up I got 3/4

**MATH**

3/4 hi

**English**

Why should grade 8 students have to do volunteer hours to graduate grade 8? Please provide me with atleast 6 points and so I can expand on it. Your help is very much appreciated!:)

**physics**

The above answer is some ass

**statistics**

44.5

**Math**

4

**Math**

How to find the exact value of tan(sin^-1x/2) I'm having trouble with finding the inverse of sin x/2 value.

**Math**

Thanks.

**Math**

What is the inverse trig function cotangent of square root of 3/3? What is the value?

**Combinatorics**

Bob is at an amusement park with 10 different rides. He only has time to go on 3 rides, before he needs to head back for his curfew. If he only wants to go on each ride a maximum of one time, how many different ways are there to go on 3 rides?

**Chemistry**

15.5 M

**physics**

A small plastic ball of mass m = 1.50 g is suspended by a string of length L = 15.5 cm in a uniform electric field, as shown in the figure below. If the ball is in equilibrium when the string makes a θ = 19.0° angle with the vertical as indicated, what is the net ...

**To the Person who just posted an English question:**

Need help, is the name yun ok inappropriate help!

**Math**

Of 30 students, 12 play football, 17 play soccer, and 5 play both, how many play neither?

**math**

kevin drew a scale drawing of his living room,The actual room is 16 feet long.If the room is 12 inches long in the drawing,what is the scale of the drawing?

**civics**

At the Constitutional Convention of 1787, a major conflict between the delegates centered on the issue of __________.

**Social Studies**

How did the immigrants who came to the United States between 1820 and 1860 change the character of the country?

**English**

I say 3. I go to a museum to look at pictures...

**Science**

i need help on a compound machines

**chemisty**

found the answer to be 36.03 ml

**chemisty**

Hydrogen peroxide can be prepared by the reaction of barium peroxide with sulfuric acid according to BaO2(s)+H2SO4(aq)=BaSO4(s)+H2O2(aq) How many milliliters of 5.00 M H2SO4(aq) are needed to react completely with 30.5 g of BaO2(s)?

**Math**

Is this true or false? To expand the binomial (x2 + 3)6, use the row of Pascal's triangle that has coefficients 1, 5, 10, 10, 5, 1.

**math**

280

**math**

I love ponies! O /l\ /\

**math**

how to solve: tan(sin(x))=tan(x)sin(x)?

**physics**

a 3000 pound car is parked on a hill at an angle of elevation of 16 degrees. how much force must the brakes exert to keep the car from rolling down the hill?

**Ms. Sue please help**

What is the highest temperature in the exosphere.

**math**

Hahaha! Oh Steve you crack me up with all that verbage and question asking. Anyways the question said to find a14, NOT a11. a14 = 15/199. So out of the wordy answer choices Paige gave, the answers C.

**science**

what is the structural formula for a) 3,3,4-trimethyloctane B) 2-methyl-1-pentene

**science**

A 65.7 kg person jumps from a window to a fire net 21.0 m below, which stretches the net 1.14 m. Assume that the net behaves like a simple spring, and calculate how much it would stretch if the same person were lying in it.

**Physics**

A bungee jumper with mass 69.7 kg jumps from a high bridge. After reaching his lowest point, he oscillates up and down, hitting a low point eight more times in 39.0 s. He finally comes to rest 25.0 m below the level of the bridge. Calculate the spring constant of the bungee ...

**Earth Science**

Which organism evolved before the others in geologic time? mammals amphibians reptiles **fish Which type of organism evolved later than the others? **mammals amphibians reptiles fish

**math**

Reiny is weird

**Math Gr.12 (Calculus)**

How do i do this? 3= 6x^2 - 2x -8

**Economics**

10,000

**computer science**

Who invented Java?

**Microsoft excel unit**

Determine the present value of a pension plan that will pay you 20 yearly payments of $7,000 each;the current rate of return in 7.5%

**Plane Trigometry**

500 miles

**BIOLOGY PLEASE HELP!!!!!!!!!!!!!!!!**

actually its atp synthase

**BIOLOGY PLEASE HELP!!!!!!!!!!!!!!!!**

embedded protein in the electron transport chain where h+ ions flow back into the matrix of the mitochondria Crossword puzzle 11 spaces sixth letter is n cant figure it out?

**biology**

inner membrane space

**biology**

Its a Crossword

**biology**

where do h+ ions accumulate in the mito chondria? 18 spaces 17th letter is c cant figure it out?

**biology**

embedded protein in the electron transport chain where h+ ions flow back into the matrix of the mitochondria 11 spaces sixth letter is n cant figure it out?

**Biology**

what molecule is released before acetyl coa enters the krebs cycle Doing cross word puzzle 13 spaces cant figure it out?

**SCIENCE**

HOW DOES THE FORMATION OF SEDIMENTARYROCK IN THE OCEAN CONTRBUTE TO TH FORMATION OF OIL

**SCIENCE**

HW DOES SEDIMENTARY ROCK FORMED

**physics**

a. 2 b. 4 c. 4 do you have answer for problem 11?

**math**

Thanks many many times

**math**

1/4x + 13 > .25(2x-32)

**Physics**

32

**Math**

Solve the equation: 4x^2 + 100 = 0 Here is my work: 4x^2 + 100 = 0 - 100 - 100 4x^2 =0 /4 /4 x = -5 or 5. Did I do this correctly?

**Algebra**

Write the expression in descending exponent form. -7y + 8y3 - y6 I think I have to combine like terms but I don't know how. Please help?

**SOCIAL STUDIES!**

Pop

**physics**

A positive test charge of 6.47 × 10^−5 C is placed in an electric field of 50.12 N/C intensity. What is the strength of the force exerted onthe test charge? Answer in units of N

**MATH**

NOლ(ಠ_ಠლ)

**algebra**

^^

**Physics**

yo mama

**Health**

someone give me th4e answer5 i 7dont have1 a11 d2y

**Trigonometry**

Which of the following is not a solution of the equation tan squared A =3? (1) -pie/3 (2) 2pie/3 (3) 5pie/6 (4) 120 degrees

**trig**

To the nearest degree, all of the following angles are solutions of the equation 2sin x + 4 cos 2x =3 except: (1) 40 degrees (2) 150 degrees (3) 166 degrees (4) 194 degrees

**physics**

12 kg

**Physics**

Calculate the kinetic energy that the earth has because of (a) its rotation about its own axis and (b) its motion around the sun. Assume that the earth is a uniform sphere and that its path around the sun is circular. For comparison, the total energy used in the United States ...

**Physics**

When some stars use up their fuel, they undergo a catastrophic explosion called a supernova. This explosion blows much or all of a star's mass outward, in the form of a rapidly expanding spherical shell. As a simple model of the supernova process, assume that the star is a...

**math**

the areas of two similar rectangles are 338 cm squared and 73 cm squared. what is the similarity ratio of the perimeters

**us history**

who developed the first fiscal plan?? was it hamilton and who was the author of the great compromise in constitution? was it madison

**MicroEcon**

Suppose that you supply bottled water in a competitive market and that you are producing the profit-maximizing quantity of bottled water. If you can sell your water at $2 a bottle and you currently employ five workers at a wage of $50 a day, what is the value of the marginal ...