Sunday

June 26, 2016
Total # Posts: 1,564

**physics**

ok, to calculate KE of a non-relativistic electron, we use the formula: K=.5mv^2=p^2/2m and K=h^2/(2m wavelength^2) do we use the same formula to calculate the KE of a non-relativistic proton?
*May 28, 2009*

**Physics**

thanks!
*May 28, 2009*

**Physics**

if light touching a surface has an intensity of about 1000W/m^2, how many numbers of photons per m^2 per sec does this show? wavelength of P=600nm
*May 28, 2009*

**physics**

so do you mean total E=KE+PE? i think i can use the r=r0A^(1/3) to find the radius of the nucleus, but i am still not sure what i should do with the E and wavelength. confused.
*May 28, 2009*

**physics**

one nucleus decays by emitting an alpha aprticle of KE x Mev. if such alpha particle goes directly toward another nucleus of the same atom, what is the distance of closest approach? i don't quite get this question.am i supposed to find r since r=r0A^(1/3)? but what is with...
*May 28, 2009*

**4th grade**

What is a person from the country known for koala bears and kangaroos called?
*May 19, 2009*

**math**

thanks everyone!
*May 15, 2009*

**math**

the answer would be(C)
*May 15, 2009*

**math**

A computer store sold a total of 300 items last month. The store sold six times as many hard drives as they did CD-ROM drives, and half as many floppy drives as hard drives. Based on this information, how many of each item were sold? A. 30 hard drives, 90 floppy drives, and ...
*May 15, 2009*

**mathematics**

A retail jeweler sells a pair of gold earrings for $213.90. The jeweler uses a 130% markup based on cost. Based on this information, what was the wholesale cost of the earrings? A. $93.00 C. $276.90 B. $164.53 D. $278.07 213.90 divided by 130%=164.53 B
*May 14, 2009*

**math**

A college professor has 370 papers to grade. In one evening, she grades 80 percent of them. How many ungraded papers will remain for her to complete tomorrow? A. 316 C. 82 B. 296 D. 74 I x'd 370 by 80% which equaled 296 then I subtracted 296 from 370 and came up with the ...
*May 14, 2009*

**math**

thanks
*May 14, 2009*

**math**

Add the fractions 2/3, 3/8, and 5/12 and reduce your answer to lowest terms. A. 10/24 C. 1 11/24 B. 25/24 D. 1 1/2 would you add 2/24, 3/24, and 5/24 which equals 10/24 but I don't understand the lowest terms.
*May 14, 2009*

**math**

In a restaurant, a man ordered soup for $3, an appetizer for $4.25, dinner for $17.90, a beverage for $1.50, and dessert for $3.75. He left the server a 15% tip. What was the total cost of the man’s meal, including the tip? A. $36.11 C. $30.40 B. $34.96 D. $4.56 my answer...
*May 14, 2009*

**4th grade Vocabulary**

How can I use transmitter in a sentence? P.S it has to be aboout hiking also
*May 4, 2009*

**science**

I don't understand how to answer USE OF DATA in science labs.
*April 13, 2009*

**science vocabulary**

What does "deviations" mean?
*March 26, 2009*

**healthcare**

I need some help inlistening two pros and two cons for a patient caregiver roles. 1.Mechanic and machines 2. Parents and children 3. Spirituals and believers. 4. Providers and consumers. 5. Partners. This for me to write my paper.
*March 11, 2009*

**10th grade chemistry**

A weather ballon with a 2 meter diameter at ambient temperature holds 525 grams of helium. What type of electronic probe could be used to determine the pressure inside the balloon?
*March 8, 2009*

**Grade 8 science**

What is an example of a non-living thing made up of cells?
*March 5, 2009*

**college math**

A camper has 3 jackets, 6 sleeping bags, and 14 different packages of food. An "outfit" consists of 1 jacket, 1 sleeping bag, and 7 packets of food. How many different outfits are there?
*February 21, 2009*

**history**

It would be B. The Federalists used it to silence the Jeffersonian Republicanists.
*February 21, 2009*

**Science**

what is the source of energy entering Earth's atmosphere?
*January 22, 2009*

**Social Studies**

What are 3 arguements Americans gave for expansion in the 1800s.
*January 19, 2009*

**Science**

Which of the following would most likely NOT be likely to produce a microclimate? a. an ocean shoreline b. a valley c. a flat prairie d. a large city
*January 15, 2009*

**Math 8th grade**

How do you know though?
*January 15, 2009*

**music**

What pieces did Palestrina compose?
*January 3, 2009*

**biology**

If an atom of sulfur (atomic number 16) were allowed to react with atoms of hydrogen (atomic number 1), which of the molecules below would be formed? a.S-H b.H-S-H c.H-S-H | H d.H | H-S-H | H e.H=S=H
*December 11, 2008*

**Biology**

How many grams of the molecule in the figure above would be required to make 1 L of a 0.5 M solution of the molecule? H O | || (looks like C=O on the vertical) H-C-C-O-H | H a.29 b.30 c.60 d.150 e.342
*December 11, 2008*

**6th grade art**

The Dove of Peace by Pablo Picasso 30 x 24 inches . . . is that right? I also need to know where the art peice is located today and when it was made.
*November 23, 2008*

**Physical Science**

The one that is fastest has more power, and as for the work, it depends on the mass of each person and the height of the flight of stairs.
*November 19, 2008*

**6th grade art**

What was the Philosophies of Picasso.
*November 16, 2008*

**math 5th grade**

All I do is type in google or look in a library book
*November 14, 2008*

**Math**

Triangle PQR is a 30-60-90 triangle with right angle Q and segment PQ as the longer leg. Find the possible coordinates of R if (2,6) and Q(2,-6).
*November 7, 2008*

**Math**

Ray AF bisects angle DAB, Ray AE bisects angle DAF, and ray AD bisects angle CAF. Draw a picture that represents this situation. (I drew a picture but I still do not understand.) If the measure of angle DAB=x, find the measure of angle BAC. Answer choices: 3x over 4 , 6x, or ...
*November 7, 2008*

**physics**

How much does a 600 N spaceship weigh on the moon if the moon's gravity is 33% of Earth's?
*October 22, 2008*

**science**

the amount of matter in an object.
*October 22, 2008*

**Biology**

When milk is present, the lactose repressor binds to the lac operon. Is this true or false? I think it is false.....?
*October 16, 2008*

**Math**

This site is great
*October 7, 2008*

**AP Chemistry**

what does pv/nRT tell you?
*October 2, 2008*

**8th grade home economics**

make it all over again x
*September 24, 2008*

**English**

Sorry if it seems so sad , the ending is a LOT happier
*September 21, 2008*

**English**

This is just the opening
*September 21, 2008*

**English**

I wrote this 2 years ok - please could you critique it A tale of dishonesty Our story takes place in Zakinthos – a place in Greece- long ago. It is all about the Princess of that fine land. Her name was Maria and she was sick of palace life. She stayed there as her love...
*September 21, 2008*

**7 grade math**

I need help on this one question please help me
*September 18, 2008*

**ict**

ive looked on the sites everyone has kindly helped with the ict homework but i`m stuck on the definition of groups on the internet . thankyou so much
*September 16, 2008*

**pre calculus**

Yes,what do you do at that point? then you have the height as 4, but where does the 15 come in?
*September 1, 2008*

**Science**

If you eat more than 5 advils, what's the harm?
*August 5, 2008*

**math**

two puppies are chosen at random from a box at the mall. what is the probability of these outcomes 1)2;a tail then a head
*May 26, 2008*

**math: percent and fractions**

When writing a percent as a decimal,why do you move the decimal point 2places
*April 6, 2008*

**math: percent and fractions**

If 6eggs in 50% of an egg crate how many eggs are in the whole
*April 6, 2008*

**math: percent and fractions**

40% of jennies friends play kickball on weekends,what fraction of her friends don't play kickball
*April 6, 2008*

**solar systems**

if the earth rotated every 16 hours how would this affect solar eclipses, the phases of the moon and our tides
*April 1, 2008*

**math**

this is tha question a television series consits of 8 programes, each 3 over 4of an hour. how many 3hour tapes would be required to tape the series please tell me how you work it out
*April 1, 2008*

**physical science**

which one of the following frequencies of a wave in the air can be heard as an audible sound by the human ear? A.0.10Hz B 10 Hz C. 1,000 Hz D. 100,000Hz
*March 25, 2008*

**science**

who is the primminster of Canada
*March 16, 2008*

**English**

what rhetorical devices does david suzuki use in his opening sentence, and how does it begin to introduce his subject?
*March 15, 2008*

**math**

if you have x squared x and then a blank what is tha value of that blank x2+x+b what is b perfect square of a trinomial?
*March 12, 2008*

**Chemistry**

What is the Lewis structure for IF4-?
*March 10, 2008*

**Math**

xxxxxxxxx xxxxxxxxx xxxxxxxxx xxxxxxxxx xxxxxxxxx xxxxxxxxx xxxxxxxxx
*February 11, 2008*

**Social Studies**

What's the capital of Falkland?
*January 15, 2008*

**math**

Antonio said, "To solve 506-288, I can think of 5 hundreds as 50 tens." How might this help him subtract?
*January 9, 2008*

**Physics (again, sorry)**

A swimmer maintains a speed of 0.15 m/s relative to the water when swimming directly toward the opposite shore of a straight river with a current that flows at 0.75 m/s. (a) How far downstream is the swimmer carried in 1.5 minutes? (b) What is the velocity of the swimmer ...
*November 29, 2007*

**Physics**

Sorry I wasted your time! I understand it now!
*November 29, 2007*

**Physics**

A small plane takes off with a constant speed of 130 km/h at an angle of 37 degrees. In 3.00 s, how high is the plane and what horizontal distance has it traveled from the lift-off point. I know I should convert 130km/h into meters per second, but after that I am stuck. Can ...
*November 29, 2007*

**history**

Research it then.
*November 25, 2007*

**Grammar**

This is a TV Show though
*November 25, 2007*

**Grammar**

How do you write tv shows? For example: Some high school students have known that they want to become doctors ever since they picked up their first toy stethoscope or watched their first episode of Grey's Anatomy. How do I write Grey's Anatomy? Italicize or quotes? ...
*November 25, 2007*

**spelling**

My teacher wanted me to tell the class what Honolulu meant and Hawaii meant. I really had no idea want they ment, so when I got home I went on the computer to try to figure out the qestion. As I went on the computer I searched really hard but I could not find the answere! Of ...
*November 18, 2007*

**math**

The area of a rectangular field is 12,750 square yards. The width is 150 feet. What is the length of the field in yards.
*November 6, 2007*

**Lunch**

What should i take for lunch tomorro? i get hungry lots
*October 29, 2007*

**science**

Why do 6-ounce boxing gloves hit harder than with 16-ounce gloves?
*October 21, 2007*

**science**

why is a punch more foreful with a bare fist than with a boxing glove?
*October 21, 2007*

**science**

Which has the greater momentum when they move at the same speed- an automobile or a skateboard? Which requires the greatest stopping force?
*October 21, 2007*

**science**

If you throw an egg against a wall, the egg will break. But if you throw it at the same speed into a sagging sheer, it may not break. Why?
*October 21, 2007*

**science**

When rollerblading,why is a fall less harmful on a wooden floor than on a concrete floor that has less give?Explain in terms of impulse and momentum.
*October 21, 2007*

**Algebra-please check my work**

check my answers please. Use the Intermediate Value Theorem to determine whether the polynomial function has a real zero between the given integers. f(x) = 2x3 + 10x2 - 8x - 5; between 1 and 2 -I got: f(1)=1 and f(2)=35;no Determine the maximum possible number of turning ...
*October 15, 2007*

**spainsh**

i need to find spainsh words begining with all the letters of the spainsh alaphbet. i can't find any for k, x, z or w
*October 9, 2007*

**Social Studies**

need inside map of La Monte school r 5
*September 20, 2007*

**Social Studies**

need map of La Monte school
*September 20, 2007*

**Physic**

what type of materials do people use as ohmic conductors? thanks.
*September 16, 2007*

**economics- opportunity cost**

what does thinking at the margin help compare
*September 10, 2007*

**Pysics Word Problem**

4. An automobile is traveling at 30 km/hr. It accelerates at 3 m/s2 until it has covered 100 meters.. What is its new velocity? I asked my teacher on what formula I should use and said I should use this one: V^2= Vo^2+2ax (V^2 is the velocit, Vo is the initial velocity, a is ...
*August 29, 2007*

**Physics Word Problem**

4. An automobile is traveling at 30 km/hr. It accelerates at 3 m/s2 until it has covered 100 meters.. What is its new velocity? I asked my teacher on what formula I should use and said I should use this one: V^2= Vo^2+2ax (V^2 is the velocit, Vo is the initial velocity, a is ...
*August 29, 2007*

**Physics**

Could you please check my answers and units.Also, help me with 3 and 4, I dont quite understand them. Thanxs! 1. An automobile starts from rest and accelerates at 3m/s2 for 4 seconds. How fast is it going after acceleration? -I got 12 m/s 3. At time = 0 an automobile already ...
*August 28, 2007*

**Physics**

I am still not understanding. Like for number 3, this is as far as I got 30km/36000000. Then for number 4, would it be similar as to number 3? Also, did I get number 1 correct?
*August 27, 2007*

**Physics**

Could you please check my answers and units. Thanxs! 1. An automobile starts from rest and accelerates at 3m/s2 for 4 seconds. How fast is it going after acceleration? -I got 12 m/s 3. At time = 0 an automobile already traveling at 30 km/hr. accelerates at 3m/s2 for 2 seconds...
*August 27, 2007*

**Science**

I have some equations that I would like checked. Thanxs! 1. An automobile starts from rest and accelerates at 3m/s2 for 4 seconds. How fast is it going after acceleration? 3m/s^2 / 4 = .75 m/s 2. If an automobile travels at 30 km/hr. for 2 hours, how far does it go? d=(30 km/...
*August 26, 2007*

**maths**

how do i solve this equation? 2/(x+1)=1/(x-1) - (1/(2x-1)) thx Get a common denominator (x+1)(x-1)(2x-1) then, each term, multipy it out. Gather terms, solve.
*July 12, 2007*

**maths**

how do i solve this equation? 21(X-(1/7))^2= 3/7 thx Divide both sides by 21 Take the square root of both sides. Rewrite it as x - (1/7)= sqrt [(1/21)*(3/7)] = sqrt[(1/7)*(1/3)(1/7)] = (1/7) sqrt(1/3) x = (1/7)[1 + sqrt(1/3)] tahnks x=(2)/(7),0
*July 12, 2007*

**maths**

how do i factorise this?: p^2+2p+1-t^2 thx. p^2 + 2p + 1 - t^2 = (p+1)^2 - t^2 This is the difference of two squares, so it can be rewritten =(p+1+t)(p+1-t)
*July 11, 2007*

**Maths**

solve the following pair of simultaneous equation: (x/a)+(y/b)=1 (x/b)+(y/a)=1 can someone help please?i have no idea how to solve it =( x/(ab) + y/b^2 = 1/b x/(ab) + y/a^2 = 1/a Subtract one from the other y(1/b^2 - 1/a^2) = 1/b - 1/a y(1/b + 1/a)(1/b - 1/a) = (1/b - 1/a) ...
*July 11, 2007*

**maths**

each of the students in a class writes a dirrerent 2 digit number on the whiteboard. the teacher claims that no matter what the students write, there will be at least three numbers on the whiteboard whose digits have the same sum. what is the smallest number of students in the...
*July 7, 2007*

**ACCOUNTING**

#1 chin company incurred direct materials costs of $300,000 during the year. manufacturing overhead rate is 70%. how much are chin company total manufacturing costs for the year?
*July 6, 2007*

**maths**

five bales of hay are weighted two at a time in all possible combinations. the weights, in kilogrames, are: 110,12,113,114,115,116,117,118,120 and 121 what is the weight, in kilograms, of the heaviest bale? can someone please show me how to do this question?thx. Something is ...
*July 6, 2007*

**physics**

a gardener pushes a wheelbarrow. according to Newton's third law the barrow's reaction force on the gardener is the exact opposite of her force on the barrow. a bystander concludes the gardener and barrow will not move because they push equally against each other. how ...
*June 29, 2007*

**physics**

why are you more likely to have an accident on your bicycle if you are riding it on a gravel or wet pathway?how do i explain this using newton's law(s)? thanks consider newtons first law. Then, consider friction on the tire on gravel, wet vs dry pavement. isn't it ...
*June 29, 2007*

**Physics**

when you watch a cricket player catch the cricket ball, you will notice that he allows his hands to trace the path of the ball as it reaches him what is the physics principles behind this? and baseball catching is different, as the catcher moves towards the ball often with his...
*June 28, 2007*

**Physics**

In the game of netball, players often move quickly and then come to a sudden stop. how does the abrupt nature of the game relate of the knee injuries netball players frequently suffer? thanks IT sesms to me that abrupt stopping (the feet stop first, and then the knee ligaments...
*June 28, 2007*