Thursday
December 18, 2014

Posts by bob


Total # Posts: 2,499

Science
What uses wind to generate electricity?
November 8, 2011

Science
Can you explain it?
November 8, 2011

Science
Different kinds of sedimentary rocks exist because A. they were formed in different places B. their formation took different lengths of time C. they were formed by sediments from different rocks D. they have been cut differently I THINK ITS C is that right?
November 8, 2011

geometry
Question 14: The following circle has a radius of 8 feet: What is the total area of the shaded regions?
November 4, 2011

calculus
I hate calculus
November 4, 2011

statistics
A density graph for all the possible speeds between 0 mph and 320 mph is in the shape of a triangle. What is the height of the triangle?
November 3, 2011

Chem!!
Consider the dissolution of CaCl2: CaCl2(s) -----------> Ca2+(aq) + 2Cl-(aq) ΔH=-81.5 kJ/mol An 11.0 gram sample of CaCl2 is dissolved in 125 g water with both substances at 25.0 °C. Calculate the final temperature of the solution assuming the solution has no heat ...
November 2, 2011

Science
What is the source of energy in fossil fuels?
November 2, 2011

PREDICT
In 1955 each farm worker in the United States produced enough food to feed 20 people. By 1960 farming methods had improved, and one worker could supply 25 people. By 1965 that number became 40 people. In 1970 it was 45 people.In 1975 it increased to 60 people. In 1980 one ...
November 1, 2011

Predict
In 1955 each farm worker in the United States produced enough food to feed 20 people. By 1960 farming methods had improved, and one worker could supply 25 people. By 1965 that number became 40 people. In 1970 it was 45 people.In 1975 it increased to 60 people. In 1980 one farm...
November 1, 2011

Math Logic
If there are as many rational numbers as there are irrational numbers then the set of all irrational numbers is infinite
October 30, 2011

statistics
so you look like mixed toast ha ha
October 27, 2011

Math
Which group names all the whole number factors of a composite number? A) 2,3,12,24 B) 1,5,10 C) 1,3,5,15 D) 1,31
October 27, 2011

Math
How high will a baseball that is thrown up into the air at 48 feet per second go if it starts its flight at a height 10 feet above the ground?
October 26, 2011

Language
It is b because a platypus is a platyhhelminthes, and a worm is a marsupial
October 26, 2011

Math
k thanks
October 26, 2011

Math
what does 4 _____ 6 equal
October 26, 2011

Math
what does 4 - 6 equal?
October 26, 2011

Physics
what is g
October 26, 2011

chemistry
If 25 ml of 0.11 M sucrose is added to 10 ml of 0.52 M sucrose, what will be the resulting Molarity?
October 24, 2011

physics
a small bead can slide without friction on a circular hoop that is in a vertical plane and has a radius of 0.100 m. The hoop rotates at a constant rate of 3.00 rev/s about a vertical diameter. Find the angle beta at which the bead is in vertical equilibrium. what would happen ...
October 24, 2011

Science
Which process takes the longest time? A) The wind erodes a sand dune on the beach B) A maple tree grows to be 100 feet tall C) High mountains are eroded to gentle hills D) A river floods and changes its course
October 22, 2011

Science
Which of the following describes the slowest change on earth's surface? A) Gravity pulls an area of wet soil and rock downward in a landslide B) An earthquake releases energy that built up below Earth's surface C) Lava explodes from a volcano on an island D) A canyon ...
October 22, 2011

Physics
Work of 730 J is done by stirring an insulated beaker containing 80 g of water. What is the change in the temperature of the water? Please show calculation
October 19, 2011

......
Why do some people delete other messages
October 18, 2011

physics
A hockey puck slides across the ice at a con- stant speed. Which of the following is true? 1. The puck is moving and thus not in equi- librium. 2. The puck can be considered neither at rest nor in equilibrium. 3. It is in equilibrium. 4. None of these 5. The puck is at rest.
October 17, 2011

science
how do cells use food using big idea of energy
October 16, 2011

science
how do cells use food using big idea of energy
October 16, 2011

chemistry
The solubility product constant (Ksp) for the dissolution of Cu(OH)2 as represented by the chemical equation is 2.6 x 10-19. Cu(OH)2 (s) Cu2+ (aq) + 2 OH- (aq) Calculate the moles of Cu(OH)2 that dissolves in 1900 mL of water. i know how to do it when its one to one but for ...
October 14, 2011

art
got a project about you need to find 12 pictures to suit the vales like line texture and etc
October 14, 2011

Algebra
I have 37 coins, nickels dimes, quarters that equal 5.50 . I have 4 more quarters than dimes . How many nickels do I have?
October 13, 2011

Organic Chemistry
What is the mechanism of action between sodium benzoate (NaC6H5COO) and hydrochloric acid (HCl)? I need to know where the electrons go in this reaction.
October 11, 2011

Organic Chemistry
What is the mechanism of action between between benzoic acid (C6H5COOH) and sodium bicarbonate (NaHCO3)? I need to know where the electrons go in the acid-base reaction.
October 11, 2011

Engineering Statistics
what numbers did u plug in for z and x in the formula z=x-u divided by the s.d
October 11, 2011

statistics
A sample of 12 measurements has a mean of 20 and a standard deviation of 2. Suppose that the sample is enlarged to 14 measurements, by including two additional measurements having a common value of 20 each. Find the standard deviation of the sample of 14 measurements.
October 11, 2011

Math
1.8=[(5.0-x)/100]/[x/150] Solve for x
October 11, 2011

calculus
t(t-4)(t-4)
October 11, 2011

Chemistry
You have a solution that contains 5.0 grams of oxalic acid dissolved in 150 mL of water. This solution is placed in a separatory funnel, and the 100 mL of diethyl ether is added to the separatory funnel and an extraction is performed. Use the following constants to calculate ...
October 11, 2011

Chemistry
You have a solution that contains 5.0 grams of oxalic acid dissolved in 150 mL of water. This solution is placed in a seqparatory funnel, and the 100 mL of diethyl ether is added to the separatory funnel and an extraction is performed. Use the following constants to calculate ...
October 11, 2011

chemistry
On an activity series for metals aluminum is more active than hydrogen. Write the correct reaction to describe putting a piece of aluminum foil (pure aluminum) in 100 mL of hydrochloric acid
October 10, 2011

social studies
You can go to google
October 10, 2011

physics
An 8.4 g bullet is accelerated in a rifle barrel 45 cm long to a speed of 1020 m/s. Use the work-energy theorem to find the average force exerted on the bullet while it is being accelerated.
October 7, 2011

geometry
I really do not know, you have all the information I have in a math question
October 7, 2011

geometry
I have 4 pairs of parallel sides and each angle is 45 degrees, what am I
October 7, 2011

Physics
Show that there is no Brewster’s angle for s polarization.
October 5, 2011

Physics
Show that there is no Brewster’s angle for s polarization.
October 5, 2011

calculus
A mass on a spring vibrates horizontally on a smooth level surface. Its equation of motion is x(t)=8sint, where t is in seconds and x in centimeter. a. Find the velocity and acceleration at time t b. Find the position, velocity, and acceleration of the mass at time t=2pi/3. In...
October 4, 2011

calculus
Find the points on the curve y=(cosx)/(2+sinx) at which the tangent is horizontal.
October 4, 2011

Physics
Show that there is no Brewster’s angle for s polarization.
October 4, 2011

Physics
After the Sun exhausts its nuclear fuel, its ultimate fate may be to collapse into a white dwarf state. In this state, it would have approximately the same mass as it has now, but its radius would be equal to the radius of earth. (a) Calculate the average density of the white ...
October 4, 2011

physics
A hot air balloon is going up ward at a constant speed of 3.5 m/s. When it is 78 m above the ground, a package is released from the balloon. After it is released, for how long is the package in the air? The acceleration of gravity is 9.8 m/s2 . Answer in units of s
October 2, 2011

math
solve for b ab+3c=2x, I got b=2x-3c/a
October 2, 2011

chem
If the initial pressure of HD(g) is 2.270 atm, calculate the % decomposition of HD(g) when the reaction comes to equilibrium according to the balanced equation. The value of Kp at 727.0 °C is 0.26. The initial pressure of the reaction products is 0 atm. 2HD(g) = H2(g)+D2(g)
September 30, 2011

physics
A rocket-powered hockey puck has a thrust of 2.20 and a total mass of 0.700 . It is released from rest on a frictionless table, 2.90 from the edge of a 2.80 drop. The front of the rocket is pointed directly toward the edge.
September 30, 2011

chemistry
The initial concentration for the compounds involved in the reaction displayed were determined to be [CH4(g)] = 0.9530 mol/L, [H2O(g)] = 0.9911 mol/L, [CO(g)] = 0.7474 mol/L, [H2(g)] = 0.2717 mol/L. Calculate the value of the equilibrium constant (Kc) at 1200 K if the ...
September 29, 2011

chemistry
Calculate the molarity (M) of Na+ in a solution prepared by adding 1.00 L of 0.800 M NaHC2O4 and 250 mL of 0.300 M NaHC2O4 . Assume volumes are additive. the answer is 0.700 but im not sure how to go about solving it please help thanks
September 29, 2011

U.S. History
Thanks
September 26, 2011

U.S. History
What is the Sullivan Act?? and was it of 1911 or 1924??
September 26, 2011

Math
3 ^ (y+7) = 8 find y..i know you have to change 3 & 8 to the same thing so you can cancel them out and bring the exponents down but i don't know what you have to multiply it by.
September 25, 2011

Chemistry
The speed of light is = 3x10^8 m/s. How long w ill it take to reach Pluto, 278,000,000,000 km away? This is how I solved it: 3x10^8m/s x 1km/1000m x 1/2.78x10^11 km I keep getting the wrong answer. I am not sure if this is how you set this conversion??
September 25, 2011

Chemistry
So how would i get 100.625 nm/Msec?
September 25, 2011

Chemistry
A dragster moves at a speed of 225 miles per hour. Express this speed in nanometers per Microsecond. Ok so I've solved this problem like twenty times, each time adding something into the equation or taking something out and I almost got the correct answer, but I was three ...
September 25, 2011

Chemistry
Thank You So Much
September 24, 2011

Chemistry
length in cm of one side of perfect cube of gold with a density of 18g/cc and mass of 25g? How would i set up this equation? I don't know what length formula I would use, because I know that i am not supposed to just divide the density by the mass, because that would be ...
September 24, 2011

Chemistry
so would it be 3x10^8mi/1sec x 1000km/1m x 60sec/1 min x 60min/1hr x and then what??
September 24, 2011

Chemistry
The speed of light is = 3x10^8 m/sec. How long will it take to reach Pluto, 278,000,000,000 km away? I don't understand how to set this problem?
September 24, 2011

Chemistry
I am unsure if it starts like 3x10^8m/1sec
September 24, 2011

Chemistry
The speed of light is = 3x10^8 m/sec. How long will it take to reach Pluto, 278,000,000,000 km away? I don't understand how to set this problem?
September 24, 2011

geometry
<DOE contains points D(2,3) O(0,0) and E(5,1). Find the coordinates of a point F so that OF is a side of an angle that is adjacent and supplementary to <DOE
September 23, 2011

geometry
<DOE contains points D(2,3) O(0,0) and E(5,1). Find the coordinates of a point F so that OF is a side of an angle that is adjacent and supplementary to <DOE
September 23, 2011

Calculus
Use interval notation to indicate where f(x) is continuous. f(x)= 7x^8-5x^4+4
September 22, 2011

Science
If an object has a volume of 22 liters and a mass of 35 kilograms what's the objects density?
September 22, 2011

Science
If an object has a volume of 22 liters and a mass of 35 kilograms what's the objects density?
September 22, 2011

Science
If an object has a volume of 22 liters and a mass of 35 kilograms what's the objects density?
September 22, 2011

Business Math
Joyce took out a loan for $21,900 at 12 percent on March 18, 2007, which will be due on January 9, 2008. Using ordinary interest, Joyce will pay back on Jan. 9 a total amount:
September 21, 2011

math
the diagram shows a trapeze in a childrens playground. AC is horizontal bar 1.2m long. BX and DY are vertial posts each 3.4m tall. they are 2.5m apart. AC is suspended by ropes, AB and CD each 2.0m long. Calculate to one decimal place the vertical height of AC above the ground
September 20, 2011

physics
a car slows from 22m/s to 3m/s at a constant rate if 2.1m/s. how many seconds are required before the car is traveling at 3m/s
September 19, 2011

algebra
Mike drove 80 miles per hour. How long will it take Mona to drive 100 miles.
September 15, 2011

spanish
ustedes Nosotros
September 15, 2011

math
trying to find out the 7 numbers to a data set with The minimum 17 The range is 45 The median is 32 The mode is 41
September 15, 2011

math
trying to find out the 7 numbers to a data set with The minimum 17 The range is 45 The median is 32 The mode is 41
September 15, 2011

chem
0.015
September 14, 2011

physics
A skateboarder, starting from rest, rolls down a 13.9-m ramp. When she arrives at the bottom of the ramp her speed is 6.06 m/s. (a) Determine the magnitude of her acceleration, assumed to be constant. (b) If the ramp is inclined at 33.2 ° with respect to the ground, what ...
September 14, 2011

algebra
10 = X/4 -8 X OVER FOUR IS A FRACTION
September 13, 2011

algebra
4b + 6 = -2
September 13, 2011

math riddles for 7th grade
trying to find a porking place
September 13, 2011

MATH
25 METERS IS EQUAL TO HOW MANY GIGAMETERS
September 13, 2011

math
Woops. I accidentally wrote .09 instead of .907 However, the actual answer is just the result of the distance divided by the rate (aka whatever 39/43 is).
September 13, 2011

math
Distance = rate * time 39 miles is the "Distance" from Franklin to his home, and 43 m/hr is his "rate" of travel. You are trying to figure out the "time" it takes for him to get home traveling at this "Distance" and "rate". ...
September 13, 2011

Social Studies
nothing helps me
September 11, 2011

physics
A skateboarder shoots off a ramp with a velocity of 6.8 m/s, directed at an angle of 56° above the horizontal. The end of the ramp is 1.5 m above the ground. Let the x axis be parallel to the ground, the +y direction be vertically upward, and take as the origin the point ...
September 8, 2011

math 5th grade
120
September 5, 2011

parts of speech
10 Finally, be strong in the Lord and in his mighty power. 11 Put on the full armor of God, so that you can take your stand against the devil’s schemes. 12 For our struggle is not against flesh and blood, but against the rulers, against the authorities, against the powers...
September 4, 2011

calculus
Find the points of intersection of the curves y=2sin(x-3) and y=-4x^2 + 2
September 3, 2011

physics
An observer, whose eyes are 1.97 m above the ground, is standing 47.0 m away from a tree. The ground is level, and the tree is growing perpendicular to it. The observer's line of sight with the treetop makes an angle of 25.0° above the horizontal. How tall is the tree?
September 2, 2011

8th grade math
List the integers that can replace n to make the statement -|8| < n < or = to - |-5| true.
September 2, 2011

science
wish someone would answer my other question?????
August 31, 2011

science
give an example from everyday life that shows that the atmosphere has substance.
August 31, 2011

science
dust is often light in color,while soot from fires is generally dark.what would happen to the amounts of solar radiation reflected and absorbed if a large amount of light-colored dust was added to the air?what if a large amount of dark soot was added?
August 31, 2011

health
i guess any threat, like a pandemic or somethng of that kind
August 31, 2011

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