# Posts by bob

Total # Posts: 3,228

**chemistry**

Calculate the molar solubility of in the following substances. Pure water and 1.5×10−3 K2CrO4

*March 14, 2011*

**Physics**

L=[k(x_c)^2 - 2mg(x_c)sin(theta)]/[2mg[(mu)cos(theta) + sin(theta)]]

*March 13, 2011*

**Physics**

a) A distant spaceship carrying a red headlight, emitting light with wavelength 600 nm, is heading towards the earth. Observers on the earth detect the light from the headlight as ultraviolet light with wavelength 200 nm. What is the velocity of the spaceship? b) After the ...

*March 13, 2011*

**Really Physics**

A 2.4 Kg object moving to the right at 0.8c collides with a 3.2 kg object moving to left at 0.6c. They stick together. Find the mass and velocity of the resulting combined object by; a) assuming that you have no knowledge of relativistic physics, b) using the special theory of...

*March 13, 2011*

**maths**

a box is to be made from the piece of cardboard at right, where square corners of side x are to be cut out, and sides folded up, and top enclosed. Find the possible heights x of the sides when the volume of the box is 10, within the interval of length 1

*March 10, 2011*

**prealgebra**

The length of a rectangle is 7cm greater than the width. Find the length and the width if the perimeter is 54cm

*March 9, 2011*

**geometry**

uvw=xyz if so name the postulate that applies

*March 9, 2011*

**Chemistry**

type in 1.27*(10^-7) instead. I had the same problem

*March 9, 2011*

**Chemistry**

How many grams do 5.2×10^20 atoms of silicon weigh? Answer in units of g.

*March 8, 2011*

**physics**

And how to find, I have been working on this for a while, and keep getting a wrong solution. Answer is 45.7m/s, but I cannot get my work to figure properly.

*March 8, 2011*

**physics**

15000N on earth 2250N on moon Moon Radius= 1.74x10^6m Orbital Height 100km Total orbit 1.84x10^6m What is orbital speed?

*March 8, 2011*

**chemistry**

A pickling solution is prepared by dissolving 278 g of NaCl in 4-1 L of water. Calculate the osmolarity of the solution

*March 8, 2011*

**algebra**

Factor polynomial completely: 9y^2 - 25yz -6z2

*March 8, 2011*

**Math: Logarithms**

(log(x^6)+2log(y^3))/log(xy)

*March 7, 2011*

**College Algebra**

solve the following: Log(50x)+log(x-1)=2

*March 7, 2011*

**computers**

You wish to calculate the commission on sales. The commission is 6% on all sales that are at least 20% above cost.

*March 7, 2011*

**Chemistry**

0.05g

*March 7, 2011*

**geometry**

A sign is in the shape of a rhombus with a 60° angle and sides of 2 cm long. Find the area of the sign to the nearest tenth.

*March 7, 2011*

**Physics- magnetism**

The four wires in the figure are tilted at 20degrees with respect to the field direction. Each carries a 4.5 current and is 0.35m long. What is the magnitude and direction of the force on each wire? (the answer is in terms of B-magnetic field) Image: h t t p: //p osti mage. or...

*March 7, 2011*

**Physics**

Hows this? h tt p: //postimage. org/image/2althux44/

*March 7, 2011*

**Physics**

Give me a minute to figure out how to post image...

*March 7, 2011*

**Physics**

Just got what you were asking: Each wire: 20 degree angle I= 4.5 A l=.35m

*March 7, 2011*

**Physics**

I can't figure out how to post the image. The dimensions of the wire do not matter in this problem. And I am not given the B strength. Can I e-mail you a link to image?

*March 7, 2011*

**Physics**

The four wires in the figure are tilted at 20 with respect to the field direction. Each carries 4.5 and is 0.35 long. What is the magnitude and direction of the force on each wire?

*March 7, 2011*

**Math**

Find two numbers whose sum is 90 and one-third of the smaller number is equal to one seventh of the larger number

*March 7, 2011*

**calculus**

integrate xsin(2x)dx=

*March 6, 2011*

**calculus**

if the region enclosed by the y-axis, the line y=2 and the curve y=the square root of x is revolved about the y-axis, the volume of the solid generated is????

*March 6, 2011*

**cdemistry**

2.20

*March 4, 2011*

**Biology**

A space probe discovers a planet inhabited by creatures who reproduce with the same hereditary patterns as those in humans. Three phenotypic characters are height (T = tall, t = dwarf), hearing appendages (A = antennae, a = no antennae), and nose morphology (S = upturned snout...

*March 2, 2011*

**math**

Use four 4s to make all the numbers from 0 to 50 example 4+4 6=4+---- 4 use any mathematical signs but four 4s may be used for each number

*March 2, 2011*

**algerbra**

what is the degree of the polynomial 8x^5y^4-2x^8

*March 2, 2011*

**cambo**

180 ft long board is cut into 3 pieces. The second piece of board is twice as long as the first. The third piece of board is six times as long as the first. What is the length of the first piece of the board?

*March 1, 2011*

**Math**

Solve: 3x-2(3x-1)+4(x+1)=0

*February 28, 2011*

**Physics**

Suppose a motorcycle with uniform motion travels from a position of 5.0km[S] to a position of 20.0km[N] in 0.5h Find the motorcycle's A) displacement B) velocity C) Distance Travelled D) speed.

*February 27, 2011*

**Physics**

Suppose a motorcycle with uniform motion travels from a position of 5.0km[S] to a position of 20.0km[N] in 0.5h Find the motorcycle's A) displacement B) velocity C) Distance Travelled D) speed.

*February 27, 2011*

**Math**

A clown was shot out of a cannon at ground level. Her height above the ground at any time (t) was given by the function h(t) = -15t2 + 15t What was height at t(1), t(2),and t(3)? The flight will last how many seconds??

*February 26, 2011*

**physics**

A 25.1 g marble moving to the right at 22.9 cm/s overtakes and collides elastically with a 12.1 g marble moving in the same direction at 11.3 cm/s. After the collision, the 12.1 g marble moves to the right at 25.1 cm/s. Find the velocity of the 25.1 g marble after the collision

*February 24, 2011*

**physics**

A spring with spring constant 21 N/m is stretched 0.35 m in the positive x direction, referring to the figure. What is the spring’s restoring force (with its sign)?

*February 24, 2011*

**physics**

A ball is thrown up onto a roof, landing 4.50 s later at height h = 20.0 m above the release level. The ball's path just before landing is angled at θ = 54.0˚ with the roof. (a) Find the horizontal distance d it travels. What are the (b) magnitude and (c) angle (...

*February 23, 2011*

**math**

Find the expected value of a $1 bet in six-spot keno if three winning spots pays $1 (but you pay $1 to play, so you actually break even), four winning spots pays $3 (but you pay $1 to play, so you profit $2), five pays $100, and six pays $2,600.

*February 22, 2011*

**geometry**

what does 44 feet by 9 feet by 8 feet mean

*February 22, 2011*

**physics**

7.84*10^10

*February 22, 2011*

**Calculus - Functions?**

a billion

*February 21, 2011*

**Science**

What type of plate boundary is located at the Juan de Fuca plate and Washington state on the north American plate?

*February 21, 2011*

**math**

(radical d)!=24

*February 20, 2011*

**The United States Until 1877**

We actually do not have a book. It comes from in class lectures that we take notes on. however, missing one note that you might not write down throws you off alot.

*February 20, 2011*

**The United States Until 1877**

I am completely clueless on where to start. Its for a study guide to help us prepare for a test.

*February 20, 2011*

**The United States Until 1877**

Compare and Contrast the development of the New England, Middle, Chesapeake, and Southern Colonies. Discuss the economic, religious, and social development of each from first settlement by the British to 1750.

*February 20, 2011*

**us history until 1877**

By 1700 the British colonies on the North American mainland were remarkably different, and in many ways isolated from one another. As late as 1760 Benjamin Franklin declared that a union of the colonies was “not merely improbable, it is impossible,” because the ...

*February 20, 2011*

**pre-algebra**

a bag contains 5 green marbles 2 white marbles 8 blue marbles 9 red marbles and 6 black marbles what is the probability of drawing a white marble replacing it and then drawing a green marble? Answer choices A 1/6 B 1/15 C 1/87 D 1/90 I think its D, but I am not sure and how ...

*February 17, 2011*

**Science**

do we multipe 25 grams to 10 milimeters????

*February 14, 2011*

**geometry**

idk...

*February 13, 2011*

**math**

draw pattern block with a total of 22 sides

*February 13, 2011*

**Math**

What is the length of a rectangular lot that has a perimeter of 1400 m and a width of 100 m?

*February 13, 2011*

**physics**

A ball of mass m = 0.75 kg is thrown straight upward with an initial speed of 8.9 m/s. Plot the gravitational potential energy of the block from its launch height, y = 0, to the height y = 5.0 m. Let U = 0 correspond to y = 0. Determine the turning point (maximum height) of ...

*February 13, 2011*

**physics**

A ball of mass m = 0.75 kg is thrown straight upward with an initial speed of 8.9 m/s. Plot the gravitational potential energy of the block from its launch height, y = 0, to the height y = 5.0 m. Let U = 0 correspond to y = 0. Determine the turning point (maximum height) of ...

*February 13, 2011*

**geometry**

What Is The Area Of A Circle If The Radius Is 10 Inches?

*February 11, 2011*

**art101**

1. CheckPoint: Greek and Roman Architecture • Resource: Ch. 15 of A World of Art • Write a summary comparing the characteristics and innovations of each Greek and Roman architecture in 200 to 300 words. • Provide two representative examples of architecture for ...

*February 11, 2011*

**College Electric Physics**

(a) What is the electric potential energy in joules of two electrons separated by 1.98 nm? (b) What would be it be if the separation was doubled?

*February 11, 2011*

**Physics**

A sprinter accelerates at 4 m/s2 for 3 seconds, and then runs the rest of the race at a constant speed. If the race is 100 m, how much time does the sprinter take to fi nish the race?

*February 11, 2011*

**Algebra**

What is the area of a circle whose diameter is given by the expression 10x?

*February 8, 2011*

**math**

Forrest Lumber uses the function S(t) = -75t + 375 to determine the salvage value S(t), in dollars, of a table saw t years after its purchase. How long will it take the saw to depreciate completely?

*February 7, 2011*

**math**

Samantha can ride her bike to work in 2/3 of an hour. When she drives to work it takes 1/3 of an hour. If she drives 12 miles per hour faster than she rides her bike, how fast does she ride her bike?

*February 7, 2011*

**English 1**

tgfrvh,ki

*February 5, 2011*

**English 1**

do your own work

*February 5, 2011*

**math**

two girls caught 25 frogs. lisa caught four times as many as jen did. how many frogs did jen catch

*February 3, 2011*

**MATH**

a golf ball dropped onto a hard surface rebounds exactly 1/3 of the height from which it falls. how far will it rebound after hitting the surface for the third time if it initially dropped from a height of 18 feet

*February 3, 2011*

**math**

two girls caught 25 frogs. Lisa caught four times as many as Jen did. how many frogs did Jen catch

*February 3, 2011*

**math**

company claims 10% are green. suppose that candies are packaged randomly into samll bags of 50. school children studying percent open several bags, count colors and find the proportion that are green. a. is the Normal model appropriate here? explain b. where is the center? ...

*February 2, 2011*

**Science**

the candy nerds

*February 2, 2011*

**Science**

what about nerds

*February 2, 2011*

**math**

51/17

*February 2, 2011*

**algebra 1**

5m-m+8+=0

*February 2, 2011*

**science**

I have the same question. Did you figure out the answer?

*January 31, 2011*

**Math**

simplify: 5-s(4-7)+3s show steps

*January 30, 2011*

**Chemistry**

If Kc = 0.143 at 25°C for this reaction, find the equilibrium concentrations of C6H12 and CH3C5H9 if the initial concentrations are 0.200 M and 0.075 M, respectively. a. [C6H12] = 0.041 M, [CH3C5H9] = 0.041 M b. [C6H12] = 0.159 M, [CH3C5H9] = 0.116 M c. [C6H12] = 0.241 M...

*January 30, 2011*

**Pre-Algebra**

I don't get it because the choices are A. 25 mins B. 35 mins C. 85 mins D. 1500 mins

*January 30, 2011*

**Pre-Algebra**

Cheng drives 25 miles on a highway at a constant rate of 60 miles per hours. Jow much time does the trip take?

*January 30, 2011*

**math**

n + (n + 1) + (n + 2) =45

*January 29, 2011*

**computers**

When you press the power button on your computer, it doesn’t turn on. There is nothing…silence…absolute zero. There are no beeps, no whistles, nothing. The monitor is getting power and the power strip is turned on. 1.Draw a diagram of the wiring scheme based on ...

*January 27, 2011*

**algebra**

The force of gravity is inversely proportional to the square of the center of the earth. if you weigh 120 lbs on the surface of the earth, how much would you weigh 250 miles above the surface? (Earth's radius = 4000 miles)

*January 27, 2011*

**4th grade math**

38 is the answer

*January 26, 2011*

**science**

object weighs 40 N on earth's surface. it would weight on 10 N when its distance from earth's center is doubled halved tripled or quadrupled thankyou

*January 25, 2011*

**science**

object weighs 40 N on earth's surface. it would weight on 10 N when its distance from earth's center is doubled halved tripled or quadrupled thankyou

*January 25, 2011*

**Math**

3p^2+4P^2=63

*January 23, 2011*

**Math**

3p^2+4P^2=63

*January 23, 2011*

**math**

3p^2+4P^2=63

*January 23, 2011*

**Math**

The distance between the points (14,-18) and (15,-8) is? The point (a,b) is such that (14,-18) is the midpoint of the segment from (15,-8) to (a,b). Then a and =?

*January 23, 2011*

**chemistry**

Nevermind, the correct answer was at the top of the next page so I didn't see it.

*January 21, 2011*

**chemistry**

Nope, it was 10 degrees C, which is why I'm stumped. I didn't think any of the answer choices were right, either.

*January 21, 2011*

**chemistry**

Which of the following constants are needed to calculate the change in enthalpy (H) for heating a sample of liquid water at 10C to steam at 150C. I) the heat capacity of water II) the enthalpy of fusion of water III) the heat capacity of ice IV) the enthalpy of ...

*January 21, 2011*

**chemistry**

thanks

*January 21, 2011*

**chemistry**

I think that's what I'm looking for.

*January 21, 2011*

**chemistry**

I, IV and V only 005 10.0 points When a chemical reaction comes to equilibrium, both the forward and the reverse reactions continue, but their rates are equal. For such a system at equilibrium at 300 K and 1.00 atm pressure, the change in Gibbs free energy as the forward ...

*January 21, 2011*

**math**

if a triangle has side lengths of 6cm, 9cm and x cm, what are possible values for x?

*January 20, 2011*

**physics**

I'm sorry I meant 1.5J

*January 18, 2011*

**physics**

The answer is 15J

*January 18, 2011*

**MATH**

A is the midpoint of BC. BA=2x+5 and BC=5x-3. solve for x and find the length of BC

*January 16, 2011*