Thursday

July 31, 2014

July 31, 2014

Total # Posts: 824

**11th grade physics**

A car slows down from +32 m/s to +8 m/s in 4s. Calculate the acceleration .

**physics**

A crate of mass 32 kg is pushed up a frictionless ramp by a person as shown in the figure below. Calculate the work done by the person in pushing the crate a distance of 25 m as measured along the ramp. Assume the crate moves at a constant velocity.

**physics**

A crate of mass 32 kg is pushed up a frictionless ramp by a person as shown in the figure below. Calculate the work done by the person in pushing the crate a distance of 25 m as measured along the ramp. Assume the crate moves at a constant velocity.

**Chemistry**

A scuba diver creates a spherical bubble with a radius of 4.0cm at a depth of 30.0m where the total pressure (including atmospheric pressure) is 4.00 atm. What is the radius of the bubble when it reaches the surface of the water? (Assume atmospheric pressure to be 1.00atm and ...

**Chem**

the 4.0 is cm, depth is 30 m, and pressure is 4.00atm

**Chem**

A scuba diver creates a spherical bubble with a radius of 4.0 at a depth of 30.0 where the total pressure (including atmospheric pressure) is 4.00 . What is the radius of the bubble when it reaches the surface of the water? (Assume atmospheric pressure to be 1.00 and the tempe...

**chemistry**

23) The equilibrium constant for the gas phase reaction 2NH3 (g) <-> N2 (g) + 3H2 (g) is Keq = 230 at 300 °C. At equilibrium, __________. A) reactants predominate B) products predominate C) only products are present D) roughly equal amounts of products and reactants ...

**chemistry**

Iodine-131 has a half-life of 8 days. How many grams of a 12 g sample will remain at the end of 40 days? how do i solve this? i thought it was 12^40=1.5 but thats wrong...

**chemistry**

how do i solve the following problem? Nitrogen dioxide decomposes to nitric oxide and oxygen via the reaction: 2NO2 → 2NO + O2 In a particular experiment at 300°C, [NO2] drops from 0.0100 to 0.00650 M in 100 s. The rate of Disappearance of NO2 for this period is ____...

**chemistry**

how do i solve the following problem? Nitrogen dioxide decomposes to nitric oxide and oxygen via the reaction: 2NO2 → 2NO + O2 In a particular experiment at 300°C, [NO2] drops from 0.0100 to 0.00650 M in 100 s. The rate of Disappearance of NO2 for this period is ____...

**chemistry**

how do i solve the following problem? Nitrogen dioxide decomposes to nitric oxide and oxygen via the reaction: 2NO2 → 2NO + O2 In a particular experiment at 300°C, [NO2] drops from 0.0100 to 0.00650 M in 100 s. The rate of Disappearance of NO2 for this period is ____...

**Physics**

A ball is thrown upwards on the moon with an initial speed of 35m/s. Calculate (a)the time taken to reach the maximum height. (b) the maximum height reached by the ball (c) Its velocity 3seconds after it has been thrown. (g=1.6ms^2)

**Physics**

A stone is thrown vertically upwards from the top of a tower 50.0m high with an intial velocity of 20.0m/s. (a) whats the maximum height the stone reaches? (b) Whats the time it takes to reach the maximim height? (c) What is the total distance it covers?

**8th grade science**

1.) How does reading across a periodic table compare and contrast with reading down a group on the periodic table?

**8th grade science**

1.) How does reading across a periodic table compare and contrast with reading down a group on the periodic table?

**social studies**

why does al qaeda exist?

**social studies**

What Does Al-Qaeda actually want to achieve

**social studies**

thank you

**social studies**

How do terrorist groups use the media to portray their message

**Chemistry**

Draw the Lewis structures for each of the following, determine the shape of the molecules. a. H2S b. CN3- c. CCl4 d.NH4 e.PO4- f.PCL3 f.SF6 and explain how do you determine the shape of it

**Chemistry**

Draw the Lewis structures for each of the following, determine the shape of the molecules. a. H2S b. CN3- c. CCl4 d.NH4 e.PO4- f.PCL3 f.SF6 and explain how do you determine the shape of it

**Chemistry**

Draw the Lewis structures for each of the following, determine the shape of the molecules. a. H2S b. CN3- c. CCl4 d.NH4 e.PO4- f.PCL3 f.SF6 and explain how do you determine the shape of it

**Chemistry**

For each reaction, complete and balance the equation and give the net ionic equation. a) KOH(aq)+ZnCl2(aq)-> KCl2+ZnOH Oops theres the question...

**Chemistry**

The second half of the equation is how i had done on the exam but he said its not balanced. How do I balance this? How would it look. I keep trying but not getting. I would appreciate it if you could do this question so I can use as a guide for other similar questions.

**Chemistry**

For each reaction, complete and balance the equation and give the net ionic equation. a) KOH(aq)+ZnCl2(aq)-> KCl2+ZnOH The second half of the equation is how i had done on the exam but he said its not balanced. How do I balance this? How would it look. I keep trying but not...

**Chemistry**

I keep calculating the square root of 3RT/M, and am not worrying about the temperature. I keep using 238 and 235 as my M when I do calculate it for both isotopes. Then I end up getting 1.00 as my final answer. That can't possibly be correct, can it? The question was: The t...

**chemistry**

I got the square root of 238/235 is 1, and I know that R mutiplied by 3 is 24.9, but I'm stuck right there.

**chemistry**

The two isotopes of uranium, 238U and 235U, can be separated by effusion of the corresponding UF6 gases. What is the ratio (in the form of a decimal) of the root-mean-square speed of 238UF to that of 235UF6 at constant temperature?

**Chemistry**

Calculate the change in heat when 3.05g of water vapor (steam) at 100.0 degrees celsius condenses to liquid water and then cools to 18.50 degrees celsius.

**calculus**

Find the differential dy of the given function: y=xcosx would this just be dy=(cosx-xsinx)dx

**physics**

A bucket of mass 2.20 kg is whirled in a vertical circle of radius 1.15 m. At the lowest point of its motion the tension in the rope supporting the bucket is 28.0 N. a) Find the speed of the bucket. b)How fast must the bucket move at the top of the circle so that the rope does...

**Maths B**

Hi, i was just wondering if you could help me with how to work out this question, as i have attempted and get a bit confused at the end. here it is: A cylinder is inside a sphere- the sphere has a radius of R. What is the maximum volume of the cylinder? Thanks - really appreci...

**Calculus**

Do points of inflection have to be defined in the original function?

**College Algebra URGENT**

f(x)=1/(x+4) g(x)1/(6x+4) what is f(composed)g(x) if x does not equal -4/6 please help me

**english**

What format is used when writing a book report

**chemistry**

Determine the ratio of cations to anions for the following ionic compounds a. potassium, a salt substance b. calcium floride, used in steel industry c. aluminum oxide, known as corundum in the crystalline form d. calcium oxide, used to remove sulfur dioxide from power plant ex...

**physics**

A 4600 kg helicopter accelerates upward at 2.26 m/s2. 2 The acceleration of gravity is 9.8 m/s . What lift force is exerted by the air on the propellers?

**physics**

A 4600 kg helicopter accelerates upward at 2.26 m/s2. 2 The acceleration of gravity is 9.8 m/s . What lift force is exerted by the air on the propellers?

**Physics**

A jetliner is moving at a speed of 270 m/s. The vertical component of the plane's velocity is 39.8 m/s. Determine the magnitude of the horizontal component of the plane's velocity. Can someone please solve this?

**chem**

i understand most of the problem but where did the 0.84 M come from? a drug was injected into your body with a 2.00 M concentration. what would be its concentration after 0.010 seconds if k = 875 ^ -1 1st order reaction! ln [ A ]t = - (875 ^ -1) (0.010 SEC) + ln (2.00) = - 0.1...

**math 2nd grade**

How do you figure this out please help my daughters first grade teacher gave this homework and I don't have a clue

**8th grade science**

why are neuclar waste products a problem?

**physics**

A 715 kg object is lifted from the surface of the earth to a height of 880 kg above the surface of the earth. Calculate the increase in gravitational potential energy using the exact expression and compare it with the approximate expression using g=9.81. Give the magnitude of ...

**management**

I have ths secton to, I just don't know where to start. My learning teams, needs it tonite. And I am totally lost.

**Physics**

An electron and a proton move in circular orbits in a plane perpendicular to a uniform magnetic field B. Find the ratio of the radii of their circular orbits when the electron and the proton have the same momentum. Find the ratio of the radii of their circular orbits when the ...

**Physics**

An electron and a proton move in circular orbits in a plane perpendicular to a uniform magnetic field B. Find the ratio of the radii of their circular orbits when the electron and the proton have the same momentum. Find the ratio of the radii of their circular orbits when the ...

**chemistry**

thank you

**chemistry**

how do you change Density= mass/volume (D=m/v) to solve v or m?

**english**

Could you explain social realism please?

**english**

How is "The Handsomest Drowned Man in the World" an example of the author using social realism?

**physics**

A hockey puck moving due east with speed 1.00 m/s collides with an identical puck moving 40 degrees south of west with speed 2.00 m/s. After they collide, the first puck is moving south with speed 1.50 m/s. What is the direction and speed of the second puck?

**Physics**

A particle moving initially at 4 m/s in the positive x direction is given an acceleration of 3 m/s^2 in the positive y direction for 2 seconds. What is the magnitude and direction of the particle's velocity after 2 seconds? If the particle was located at the origin when th...

**chem**

if i have density and the mass, how do i find the valume?

**chem**

if i have density and the mass, how do i find the valume?

**History**

In what ways does the Magna Carta still impact law?

**chemistry**

8.5 to get the answer use a simple math equation where 21x= 85*2.1. Resulting in 21x= 178.5. then solve that equation and get the answer 8.5...

**english**

is the vowel sound in the word cat a) a front low short sound b) front low long sound im guessing A because how CAT is spelt "kaet" ae is a short vowel

**english phonetics**

Hello I was wondering if my answers for my phonetics assignment were correct... Articulatory - deal with manner and place of articulation of sounds pronunciation problem - the student pronounces "pale" instead of "fail" MANNER AND PLACE OF ARTICULATION? pro...

**english**

16.A velar consonant is produced when … a the tip of the tongue touches behind the alveolar ridge. b the tip and blade of the tongue touches the hard palate. c the back of the tongue touches the hard palate. d the back of the tongue touches the soft palate or velum. 17.Af...

**english**

01.Which area of Phonetics deals with manner and place of articulation of sounds? a Acoustic b Morphology c Articulatory d Auditory 02.Select the statement that is incorrect. a Phonology deals with the individual sounds of the language, word and sentence stress, intonation pa...

**english**

01.Which area of Phonetics deals with manner and place of articulation of sounds? None Acoustic Morphology Articulatory Auditory 02.Select the statement that is incorrect. None Phonology deals with the individual sounds of the language, word and sentence stress, intonation pa...

**algebra**

convert to decimal notation 8.87*10^7

**algebra**

If you are looking at a graph of a quadratic equation, how do you determine where the solutions are?

**algebra**

A chemist mixes some 20% acid solution with pure 100% acid to increase the concentration. How much pure acid and acid solution should be mixed to form 100 milliliters of 40% acid solution?

**Math**

The area of a triangle is 75 sq in. Calculate the possible angles formed by the triangle's 12-inch and 15-inch side.

**Algebra**

I did most of the equation but i cannot figure out how to change my anser into a fraction or form that I can use for my answer the last part is 3000/90???

**wo9rld history**

what dose a 16 making pictures of a bomb and threating a school have in comman with world history what is the text to text to that

**algebra 2**

The student council is picking up litter along the highway. When they are halfway done, they have collected at least 5 bags of liter. If their rate of collection remains constant, what is the total number of bags they will have when they are finished?

**algebra**

To determine the number of deer in a game preserve, a conservationist catches 523 deer tages them and let's them loose. Later 468 deer are caught, 234 of them are tagged. How many deer are in the preserve?

**algebra**

Simply by removing factor 1 p^2-36/p^2-12p+36

**algebra**

Thank you

**algebra**

Simply by removing factors of 1 q^2-25/(q+5)^2

**PSYCHOLOGY**

social learning

**Maths**

If g(x)>0 for all real values of x, which of the following could be function g? a) g(x)= x+1 b) g(x)=x-1 c) g(x)= x^2+1 d) g(x) = x^2-1 e) g(x) = x^3 + 1

**physics**

diagrams help, i had these almost exactly drawn out, but i do not know how to create the equations to solve for the unknowns. thanks

**physics**

A meter stick is pivoted at its 50-cm mark but does not balance because of non-uniformities in its material that cause its center of gravity to be displaced from its geometrical center. However, when masses of 150 and 200 grams are placed at the 10-cm and 75-cm marks respectiv...

**8th grade**

How Do you do Factorising? Thankyou -Jess

**chem**

Calculate the boiling point elevation of a solution containing 50.0 g of glucose dissolved in 500.0 g of water? We just started learning about this and i dont get it!

**geometry**

the perimeter of a triangle is 59 inches. the longest side is 11 inches longer than the medium side, and the medium side is 3 inches more than the shortest side. Find the length of each side.

**chemistry-science**

A 500 ml buffer solution contains .2M Acetic acid and .3M sodium acetate. Find the pH of the buffer solution after adding 20 ml of 1M NaOH, what is the pH? (pka = 4.74)

**Math**

I am rubbish at maths!!!!! any suggestions to help myself get better?

**Math**

what must be added to 8/3 to make 2 5/6

**algebra**

was supposed to be an x after the 0.3 sorry

**algebra**

Solve 0.3+4<=1.1x-9 Thank you

**algebra**

Are the pairs parallel, perpendicular, or neither 3x+4y=1 4x+3y=8 I say they are perpendicular

**Biology - Hormones**

What 3 steroid hormones and involved in controlling reproductive function in both non pregnant women and in men

**Math 132**

There are 7 girls and 6 boys in a class. Suppose five children are randomly chosen to decorate the game room. Given that at least one boy is chosen, what is the probability that exactly two boys are chosen?

**Biology - Hormones**

Name 3 steroid hormones involved in controlling the reproductive function of both non pregnant women and men ty

**physics**

how would i solve this? A sled is dragged along a horizontal path at a constant speed of 1.5 m/s by a rope that is inclined at an angle of 30.0° with respect to the horizontal (the figure below). The total weight of the sled is 470 N. The tension in the rope is 240 N. How ...

**physics**

i got 6.075E12 for the meteor and 588,700 for the car, but both answers are still wrong.

**physics**

how do i go about in solving this? A helium atom (mass 4.0 u) moving at 596 m/s to the right collides with an oxygen molecule (mass 32 u) moving in the same direction at 402 m/s. After the collision, the oxygen molecule moves at 445 m/s to the right. What is the velocity of th...

**algebra**

Solve tne compound inequality 4x+2>= -22 or 7x+2>= -19 Thank you

**algebra**

Could you please help me solve. 3x+10>=7 and 2x-14>=-8 >= means greater than equal then thank you

**algebra**

Solve by the elimination method 0.3x-0.2y=4 0.4x+0.5y= - 55/17 Thank you

**algebra**

solve 2y-2<6y-3 Thank you

**algebra**

Determine whether the ordered pair is a soultion of the inequality. (8,18);7y-8x>3 I would have to say no? Thank you

**physics**

The prong of a tuning fork moves back and forth when it is set into vibration. The distance the prong moves between its extreme positions is 2.24 mm. If the frequency of the tuning fork is 440.7 Hz, what are the maximum velocity and the maximum acceleration of the prong? Assum...

**chemistry**

calculate the concentration of each solutions: 3 moles of solute dissolved in 2 liter of solution 6 moles of solute dissolved on 9 liters of solution 4 moles of solute dissolved in 3 liters of solution

**algebra**

Find an equation of the line having the given slope and the given point. m=0 (o,-4) would it be y=-4?

**algebra**

Find the slope and y-intercept, write fractional answer in lowest terms. 2y+9x+6=19+9x

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