Wednesday
April 16, 2014

Posts by pete


Total # Posts: 152

Physical Science
0.25kcal/kg-C

physics
Two hockey players strike a puck of mass 0.159 kg with their sticks simultaneously, exerting forces of 1.30 103 N, directed west, and 9.90 102 N, directed 30.0° east of north. Find the instantaneous acceleration of the puck.

PHYSICS(help)
@some0ne If the spring force and the friction force are equal and opposite, what is the net force? @Roy "How do we deduce how far back the block moves with the energy difference obtained?" The friction is a function of distance. On the way from x to x1, a certain amo...

PHYSICS(help)
(b) Asha - why did you divide by 2? Think about what a "period" of oscillation is. Leave the physics and maths to one side for a second. How is a "period" defined? Visualise it. For our motion from x to x1, how much of a period is that? (c) I got a differen...

chemistry
(111) plane wavelengt ambda= 3.091 A lattice constant is alpha = 3.53 A

chemistry
Your x-ray lab has a monochromator consisting of a single crystal of nickel cut so that the plane lies in the cube face. At what angle (in degrees) should the cube face be tilted with respect to the incident beam in order to select radiation with a wavelength ? The lattice con...

math
Mr Ernst leaves home at noon, traveling at 50 mph. His loving wife leaves at 1 pm with a briefcase that Mr. Ernst forgot. How fast must his wife drive to catch him by 5 pm?

Math
Thanks

Math
Whats the monthly principal and interest payment for a mortgage with a financed amount of $81,000 at 9% for 25 years?

Physics
Calculate the resistance of 80 metres of copper wire, with a c.s.a. of 0.5mm2, given its resistivity of 1.72 x 10^-6 ohms per metre, Note, the area of the wire must be expressed as a portion of its base unit of measurement, which is the square metre.

Physics
Suppose that you are using a multimeter on the OHMS scale to test a capacitor and the meter reads zero. What condition of the capacitor does this indicate?

fire science
A compartment measures 14 feet wide, 12 feet long and 8 feet high, lined with ½ inch sheetrock and has a standard 36 inch by 80 inch door. What HRR is required for flashover?

Physics
A fuel has heat of combustion equal to 30 kJ / g. How much energy is released when 5 kilograms are oxidized?

Physics
A compartment measures 3.5 meters by 5.5 meters and is 3 meters high. A fire raises the temperature from 68of to 1500 of. If the starting pressure was 1 atmosphere, what volume is present at the elevated temperature assuming the compartment has openings to reduce pressure?

Physics
A compartment measures 3 meters by 5 meters and is 2.8 meters high. A fire raises the temperature from 20oC to 1000 oC. If the starting pressure was 1 atmosphere, what pressure is present at the elevated temperature assuming the compartment remains closed?

Math
Sales tax an item that cost $3.00 + tax rate is 6%

Math
Find the sum of all integers c, such that for some integers a and b satisfying a<b<c, a(b−c)^4+b(c−a)^4+c(a−b)^4=836

physics
On Mars, the acceleration due to gravity is 3.71 m/s2. How far would a rock fall in 3 s if you dropped it on Mars?

Algrbra
A certain paperback sells for $12. The author is paid royalties of 11% on the first 10,000 copies sold, 12.5% on the next 5000 copies, and 18% on any additional copies. Find a piecewise-defined function R that specifies the total royalties if x copies are sold. Please help me ...

math
I agree with Sneha and Ms. Sue

math
Robert planted pumpkins to sell. Their garden has 5 sides. 5 feet 8 inches, 7 feet 8 inches, 10 feet 3 inches, 7 feet 5 inches, 7 feet 11 inches. What is the perimeter of their garden?

Chemistry
Calculate the velocity of a rock that weighs 48 grams dropped from a height of 355 meters, gravity 9.8

pre-calc
jessica is standing 2 miles from the center of the base of pikes peak and looking at the summit of the mountain which is 1.4 miles from the base, what angle of elevation is jessica looking at the summit of the mountain?

nuclear
In the start of the equation .. for In(No/N) I understand the No/N is the percentage that the sample is of carbon 14 compared to a living sample, but how do you get the In ? where does it come from ?

nuclear
Is that 0.693/ t 1/2 0.693 over t one half ?

nuclear
Calculate the age of a plant sample that shows about one-eighth of the carbon 14 of a living sample. The half-life of carbon-14 is about 5760 a. Help please...

Math
heather has $2.50 in nickels, dimes, and quarters. she has 3 times as many nickels as dimes and four times as many quaters as dimes

Physics
Find the current in the 10.0 resistor in the drawing (V1 = 20.0 V and R1 = 15.0 )..?

human religions
Can you provide any examples of how some religions combine their religious practices?

human religions
what effect do you think the “combining of religious practices” will have on the future of organized religion?

physics
A toboggan of mass 8.4 is moving horizontally at 18 . As it passes under a tree, 18 of snow drop onto it. We're covering Momentum and collisions, and I have no idea where to start here.

physics
A toboggan of mass 8.4 is moving horizontally at 18 . As it passes under a tree, 18 of snow drop onto it. We're covering Momentum and collisions, and I have no idea where to start here.

Chemistry
Balance: NH3 + [Cd(NH3)4] > Cd2+ + NH4+

probabilities
The proportion of red marbels in a large jar of red and black marbels is 0.4 and the percentage of damaged red and black marbels is 0.7. What is the probability of selecting randomly a black and damaged marbel? If you randomly select three marbels, what is the probability of s...

Physics
A fire helicopter carries a 555 kg empty water bucket at the end of a cable 20.9 m long. As the aircraft flies back from a fire at a constant speed of 38.4 m/s, the cable makes an angle of 38.3° with respect to the vertical. A) After filling the bucket with sea water, the...

america past and present
philosophies of religion

Math
Mr. Smith bought shoes for $ 120 and a suit for $ 340. Find the total cost including tax if the tax rate is 5.5%. (a)$485.30 (b)$48.53 (c)$ 358.70 (d)$460 (e)$406

Psychology
Like the popular belief that older adults do poorer in schools than their younger counterparts, the midlife crisis___________________. 1.is more accurate when describing an older population. 2.is more accurate when describing adolescents. 3.occurs more often among men. 4.is la...

PS
Does it look to you like Aristotle ever performed any actual experiments with falling objects? Explain your answer, based upon your observations from this lab .

P.S.
A ball was dropped off a cliff and took 3.09 s to fall to the water below. Neglecting air resistance, how far (in meters) did it fall? (How far is it down to the water?)

physical science
A ball was dropped off a cliff and took 3.09 s to fall to the water below. Neglecting air resistance, how fast (in m/s) was the ball moving just as it hit the water

physical science
If a ball is thrown straight up at a speed of 27.8 m/s, how long (in seconds) will it continue to rise before it starts to fall back down

physics
if a van has a package in the back and is traveling 55 miles and hour is in a head on collision with a vehicle also traveling 55 miles an hour how fast is the package in the back of the van going to hit the driver in the back

computer science
to write a report on Object-Oriented Systems. The report should focus on the following systems including definition, applications, and advantages and disadvantages. • Object-oriented Systems • Object-oriented database • Object-oriented data modeling • Objec...

science
what are some positve things about cane toads

English
I'm not sure because it is the name of the beetle.

English
Ok so just capitalization every Bess Beetle in my paper.

English
The teacher will show the students a picture of a bess beetle with all the parts labeled. Does bess need to be Bess? I used bess beetle through my whole paper not sure when to capitalization bess.

English
The student will Sorry cut off the first part of the sentece. Thanks for the help

English
Will write a paragraph of what they think is the best defense mechanism of the Bess beetle and why. Is this sentece correct or should Bess be lower case?

English
I went to parent-teacher conferences, and it was not what I expected. I have learned that at parent-teacher conferences not all the parents show up. Are those sentences correct?

social studies
The American Civil War 1861–1865

English
Never mind about the first sentence I got the answer. I just need help with the second sentence. I missed spelled everyone in the second sentence.

English
I did not realize how important it was to collaborate with the staff at school, such as janitors, until I need them in my room. Teachers have so many responsibilities, and for that reason, it is beneficial for evryone to have as much help as possible. Are this sentences correc...

English
Thank you

English
Okay It took me a while to meet my communication goals because Mrs. Step was not there for a while. Now is the sentence correct?

English
It took me a while to meet my communication goals, because Mrs. step was not their for a while. Does this sentence need the comma before because?

English
THANK you I did put the comma before responsibilites.

English
Thanks

English
A teacher has so many things that they are responsible for and for that reason; it is beneficial for everyone to have as much help as possible. Is this sentence correct or should it be a comma after reason?

Critical Thinking
Which of the following illustrates the key difference between subjective and non-subjective issues?

English
Sorry did not mean to post it twice

English
Which way is better? This is for a paper.

English
Which way is better? This is for a paper.

English
The students are not so talkative in their new seats, but, they still work well in groups. The students are not so talkative in their new seats, but they still work well in groups. Which way is correct?

English
I wanted to clean the desk, because there was no room for anything on it. I, also, wanted to clean it because when papers where put down on the desk you could not find them later that day. Are these two sentences correct? Do you also put commas saying I, also, I'm not sure...

English
Never mind I figured it out. THanks

English
I learned that handling behavior in a science lab is easy to do as long as the ground rules have been laid out for the students. Is this sentence correct?

English
thank you this is the whole paragraph I helped a student with his sand lab because he did not have a partner. I helped him find different objects in the sand. I also showed him that switch the magnification will show different images. After we had done two types of sand togeth...

English
After we did two types of sand together, he did the rest on his own. or After we had done two types of sand together, he did the rest on his own. Which one is correct?

English
I need the vocab word for the following definiton: Unrealistic devices or procedures that the audience agrees to accept (ex: aside).

english
in tragedy vocabulary. I need the word for the following definition. a device where by the audience or reader understands more of a situation or of what is being said than a character is aware of.

physics
How long would a 150 W lightbulb have to glow to produce the same amount of energy expended by Georgie? Answer in units of s.

physics
A lawn roller is rolled across a lawn by a force of 109 N along the direction of the handle, which is 24.2 above the horizontal. If the lawn roller develops 66.1 W of power for 64 s, what distance is the roller pushed? Answer in units of m.

physics
A lawn roller is rolled across a lawn by a force of 109 N along the direction of the handle, which is 24.2 above the horizontal. If the lawn roller develops 66.1 W of power for 64 s, what distance is the roller pushed? Answer in units of m.

physics
A lawn roller is rolled across a lawn by a force of 109 N along the direction of the handle, which is 24.2 above the horizontal. If the lawn roller develops 66.1 W of power for 64 s, what distance is the roller pushed? Answer in units of m.

Math
Solve the system of equation. x+y+z=6 3x-2y=4z=9 x-y-z=0 ________

English
The learner will distribute color coded index cards with the three main types of rocks written on them to be used in class question and answer session. Is this sentence correct or does it need a comma?

English
Thank you

English
She also told me that I need to write as well as I speak, and I agree with her. She also told me that I needed to write as well as I spoke, and I agree with her. Which on is correct? This is for a paper and it is supposed to be in past tense.

English
Thank you

English
I made up a game for them to play and made a mental note to keep extra activities on hand for when my class finishes earlier than expected. Is this correct? My supervising teacher informed me that I speak well in class. My supervising teacher informed me that I spoke well in ...

physics
A simple pendulum has a length of 1.5 m and is pulled a distance y = 0.24 m to one side and then released. (Assume small angle.) What is the speed of the pendulum when it passes through the lowest point on its trajectory?

chem
What is the empirical formula for Ba(NO3)2

Business Communications
Thanks Ms Sue, you're a big help to everyone. Keep participating please. The answer is B according to the computer.

Physics
The speed of longitudinal waves, called P waves, is 7274.0 m/s. Transverse waves, called S waves, travel at a slower 3803.0 m/s. A seismograph records the two waves from a distant earthquake. If the S wave arrives 4.47 min after the P wave, how far away was the earthquake?

Physics
For a certain transverse wave, the distance between two successive crests is 1.89 m, and 5 crests pass a given point along the direction of travel every 12.84 s. Calculate the wave speed.

Physics
A microphone has an area of 6.7 cm2. It receives during a 4.62 s time period a sound energy of 2.5x10-11 J. What is the intensity of the sound?

Physics
A wave with frequency 12.2Hz and amplitude 47.7 mm moves in the positive x direction with a speed of 8.9 m/s. What is the waves wavelength?

Chemistry
At a certain temperature, the pH of a neutral solution is 7.77. What is the value of Kw at that temperature?

Chemistry
What is the H+ concentration for an aqueous solution with pOH = 4.13 at 25 ?

physics
a 0.180 kg ball falls 2.5m. How much work does the force of gravity do on the ball?

Physics
A uniform plank of length 5.0 m and weight 217 N rests horizontally on two supports, with d = 1.06 m of the plank hanging over the right support. To what distance, x, can a person who weighs 427 N walk on the overhanging part of the plank before it just begins to tip?

physics
What is the magnitude of the torque about his shoulder if he holds his arm straight, but 43.8° below horizontal? I tried multiplying the torque force by sin43.8 but it was wrong :(

physics
An athlete at the gym holds a 5.29 kg steel ball in his hand. His arm is 67.0 cm long and has a mass of 4.57 kg. What is the magnitude of the torque about his shoulder if he holds his arm straight out to his side, parallel to the floor?

physics
sorry wrong post!!!

physics
No I don't think I posted this question :(

VOCAB
IF I AM WRITING LETTERS TO GOD, BOY SCOUTS, US ARMY, MY LOCAL SWIMMING POOL. NOT MAILING OR EXPECTING RESPONSES, RATHER USING THE LETTERS TO TELL A STORY. IS IT CORRECT TO SAY I AM WRITING LETTERS TO VAEIOUS ENTITIES? IF NOT, WHAT WORD COULD BE USED?

chemistry
Potassium is group 2 metal and Bromide nonmetal.....group 7

Chemistry...verification
2 equation 2CoI3 + 3 K2S= Co2S3 + 6KI 2 moles of Cobalt (III) iodide + 3 moles of Potassium sulfide = cobalt (III) sulfide + 6moles of Potassium Iodide assuming all that can react will react, how many grams of cobalt (iii) sulfide will form when 1318.89 grams of cobalt (III) i...

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