Wednesday
April 23, 2014

Posts by bob


Total # Posts: 2,360

science
Is melting ice a physical or chemical change? I think it is a physical change. Am I correct?

geometry
do ur own homework

la poetry
i need help with narrative soccer

physics
An 77 person stands on a uniform ladder 4.0 long, that weighs 100 , as shown in the figure . The floor is rough; hence, it exerts both a normal force, , and a frictional force, , on the ladder. The wall, on the other hand, is frictionless; it exerts only a normal force, . the ...

Physics
A 86.0 kg diver falls from rest into a swimming pool from a height of 6.3 m. It takes 1.44 s for the diver to stop after entering the water. Find the magnitude of the average net force exerted on the diver during that time.

GRAMMAR
SALLY TOLD JANICE THAT SHE MADE THE HONOR ROLL.

physics
Gas is confined in a tank at a pressure of 10 atm and a temperature of 14◦C. If 58 percent of the gas is withdrawn and the temperature is raised to 50◦C, what is the new pressure in the tank?

chemistry
4.89 atmospheres

Math
Rewrite cos(arcsin(v)) as an algebraic expression in v. i know that the answer is squroot of 1-v^2 but i dont know the process of how to come to this answer. Thanks for the help!

10th grade World History
fdsgdfgdfgsdf

physics
A spaceship of mass m travels from the Earth to the Moon along a line that passes through the center of the Earth and the center of the Moon. (a) At what distance from the center of the Earth is the force due to the Earth three times the magnitude of the force due to the Moon?

math
WAZUPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPP NMY FRIEND HAHA

math
HIHIHIH

calculus
What is the area under each of the given curves? y=e^x/2 ; x=0 x=1

English 7 Essay: Rosa Parks (Ms. Sue)
hi

Calculus
for the function F(t)=ln(t^2), let f(t)=F'(t). Write the integral from a to b of f(t) dt and evaluate it with the fundamental theorem of calculus. the integral from 1 to 3 ___ dt= __

Economics
Suppose that some firms in a competitive industry are earning zero economic profits, while others are experiencing losses. All else equal, in the long run, we would expect the number of firms in the industry to A. increase. B. decrease. C. remain the same. D. We do not have en...

Economics
If the market price falls below $4.50, the firm will earn A. positive economic profits in the short run. B. negative economic profits in the short run but remain in business. C. negative economic profits in the short run and shut down. D. zero economic profits in the short run.

Economics
A long-run supply curve is flatter than a short-run supply curve because A. firms can enter and exit a market more easily in the long run than in the short run. B. long-run supply curves are sometimes downward sloping. C. competitive firms have more control over demand in the ...

math
what is 2 times 5

Physics
Four particles in the xy plane have the following masses and coordinates: 1 kg at (3 m, 3 m), 2 kg at (-2 m, 4 m), 3 kg at (3 m, -2 m) and 4 kg at (-3 m, -4 m). Find the total moment of inertia about: x-axis? y-axis? z-axis?

Psychology
D

history
where can i get facts about winchester cathedral

Chemistry
Rank the following atoms in terms of decreasing atomic radius. 1. Na, N, O, Mg, F 2. F, O, N, Mg, Na 3. F, Mg, Na, O, N 4. Na, Mg, N, O, F 5. F, O, N, Na, Mg

ELA
Those were great :D But do you have anymore ideas? We need to write at least a full page

ELA
Not that kind of funny but like its from this book and here was an example Don't bite your fingernails because the nails will look nasty. But the real reason not to bite your nails is cause when you take off a nail and it goes on the floor it will grow on the floor and it ...

ELA
I have to do this project and I have to say what funny stuff could happen if I cleaned my room. I dont know anything funny that could happen. so help me? :D

math
i dont know

physics
nkkn

Physics
(3kg)(8m/s)+ (5kg)(0m/s) 24kg*m/s = (3kg+5kg)vf (8kg)vf 24kg*m/s=(8kg)vf vf=3m/s

Physics
150kg*m/s

Math
what up

Math, Please Help!!!
an engineer designs a satellite dish with a parabolic cross section. The dish is 15 ft wide at the opening and the focus is placed 4 ft from the vertex. find an equation of the parabola. I know how to work this problem, but how do I know that I use the equation y^2 = 4px inste...

READING
Which line in the poem contains an example of onomatopoeia? A. Line 6 B. Line 7 C. Line 14 D. Line 15 Line 6: and you'll forget all about that broccoli you chop Line 7: Rock candy looks like beautiful glass Line 14: but spinach tastes all gritty and sandy Line 15: Taffy is...

Reading
Is it LINE 15?

Reading
Which line in the poem contains an example of onomatopoeia? A. Line 6 B. Line 7 C. Line 14 D. Line 15 Line 6: and you'll forget all about that broccoli you chop Line 7: Rock candy looks like beautiful glass Line 14: but spinach tastes all gritty and sandy Line 15: Taffy is...

Chemistry
When non-polar materials suddenly become polarized the most likely reason is due to:

Reading
WAIT no line 15

Reading
Which line in the poem contains an example of onomatopoeia? A. Line 6 B. Line 7 C. Line 14 D. Line 15 Line 6: and you'll forget all about that broccoli you chop Line 7: Rock candy looks like beautiful glass Line 14: but spinach tastes all gritty and sandy Line 15: Taffy is...

Reading
Since the 1st line ends with me and the next line ends with disagree The first line is A and the next line is B?? Then the third line ends with true and the next line ends with chew so its AABB?

Reading
Does me and disagree rhyme? it doesn't right?

Reading
Ok heres some of it Mom says that vegetables are good for me, but I am afraid I must disagree. Candy is better. I just know it's true! Because bubble gum helps me learn how to chew

Reading
What is the rhyme scheme of "Great Glorious Gobs"? A. ABAB B. BBBA C. AABB D. AABA

Calculus- rates
5

Calculus- rates
5

Social Studies
what is your primary duty if you are at electoral college

trig/math
If A is between 270degrees and 360degrees, and cos A=12/13, find the exact value of: sin2a, cos2a, sin1/2a, cos1/2a

Math, Please Help!!!
a hot air balloon is rising vertically 10 ft/sec while the wind is blowing horizontally 5ft/sec. Find the speed of the balloon and the angle x that it makes with the horizontal. I know that the speed of the balloon is the square root of (10)^2 + (5)^2, but I was wondering if s...

6th grade Math
Light travels about 1 mile in 0.000005 seconds. If a spacecraft could travel at this speed, it would travel almost 10 to the 6th power miles in 5 seconds. About how far would this spacecraft travel in 50 seconds?

algebra
s^2-4/(s+2) Simplyby removing factors of 1

Science
What are they asking in this question? Which is an alternative source of energy?

Science
What are they asking in this question? Which is an alternative source of energy?

Science
I think its corn fields but im not sure

Science
corn fields?

Science
Which source is not a source for fossil fuels? coal mine ancient swamps ancient living organisms corn fields

Science
What uses wind to generate electricity?

Science
Can you explain it?

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?

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

calculus
I hate calculus

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?

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 ...

Science
What is the source of energy in fossil fuels?

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 far...

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...

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

statistics
so you look like mixed toast ha ha

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

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?

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

Math
k thanks

Math
what does 4 _____ 6 equal

Math
what does 4 - 6 equal?

Physics
what is g

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?

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 ...

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

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 f...

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

......
Why do some people delete other messages

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.

science
how do cells use food using big idea of energy

science
how do cells use food using big idea of energy

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 th...

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

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?

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.

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.

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

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.

Math
1.8=[(5.0-x)/100]/[x/150] Solve for x

calculus
t(t-4)(t-4)

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 h...

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 ...

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

social studies
You can go to google

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.

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

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

Physics
Show that there is no Brewster’s angle for s polarization.

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