Friday
April 25, 2014

Posts by mel


Total # Posts: 465

physics
What is the smallest size plane mirror a 184-cm {\rm cm}-tall person should buy to see himself if he mounts the mirror on a vertical wall?

phsyics
the coefficient of volume expansion for iron is 3.6 X 10^-5/C degrees. If a 17 m long rod of iron is cooled from 100 degrees C to 5 degrees C, What is the new length?

PHS 105
At a particular instant, two asteroids in inter-stellar space are a distance r = 20 km apart. Asteroid 2 has 10 times the mass of asteroid 1, m2 = 10 m1. 1. If the acceleration of the asteroid 1 toward the asteroid 2 is 1.0 m/s2 , what is the acceleration of the asteroid 2?

physics
A puck is moving on an air hockey table. Relative to an x, y coordinate system at time t = 0 s, the x components of the puck's initial velocity and acceleration are v0x = +5.2 m/s and ax = +5.9 m/s2. The y components of the puck's initial velocity and acceleration are ...

Physics
After having collected samples along the shore all day long, a marine biologist walks back to her campsite, 3.02 km away. Her dog runs ahead, at twice the speed, reaches the campground and turns around until it meets her again. Then, the dog proceeds to run back to the campgr...

Physics
You throw a ball straight into the air from a height of 4 feet and with a speed of 8.22 m/s. The moment the ball leaves your hand you start running away at a speed of 3.36 m/s. How far are you from the ball, the moment it hits the ground? (what are the formulas used?)

statistics
If the average commute time is 10.9 miles, but the average is actually the mean of a sample of 300 commuters and the sample standard deviation is 6.2 miles Estimate the true mean commute distance using 99% confidence level.

statistics
conduct a study on support of ban on smartphones in class. 68/87 said yes. How large of a sample is needed to be sure the margin of error +/- 3.5% with 99% confidence. I know this is estimation...but I am not sure how to go about solving this problem.

statistics
I am conducting a study on support of ban on smartphones in class. 68/87 said yes to the ban. How large of a sample is needed to be sure the margin of error +/- 3.5% with 99% confidence. I know this is estimation...but I am not sure how to go about solving this problem.

statistics
Calculate and interpret a 95% confidence interval for the mean bp in the pop of ALL anabolic-steroid using athletes: random sample of 9 athletes resulting in a sd of 207.8, and 109 respectively. When random sample is less than 30, don't I find a t score?

accounting 1
help with journalizing payroll transactions and filling on the cash payments journal, may 15, paid cash for april's payroll tax liability. withheld taxes from april payrolls; employee income tax,$532.00; social security tax,$634.88; and medicare tax,$148.48. may 15, paid c...

accounting 1
help with journalizing payroll transactions and filling on the cash payments journal, may 15, paid cash for april's payroll tax liability. withheld taxes from april payrolls; employee income tax,$532.00; social security tax,$634.88; and medicare tax,$148.48. may 15, paid c...

fundamentals of accounting 1
journalizing payroll transactions, for Keller Systems;Inc, paid cash for april's payroll tax liability. withheld taxes from april payrolls; employee income tax,$532.00; social security tax,$634.88; and medicare tax,$148.48. paid cash for semimonthly payroll. total earnings...

Chemitry
if your smoke detector contains 0.10 mg of 241Am, how long will it take to decay 1.25 * 10^-2mg

math
3. Assume you have a fire truck that has a tank that is 60” X 70” X 57”. A. How many gallons of water will it hold?

carrer math
A standard basketball has a diameter of 9 9/16 inches (that is 9 inches and 9/16 of an inch). What is the volume of air in the basketball?

Math
Simplify. Remember to use absolute-value notation when necessary. If a root cannot be simplified, state this. 4ã(6a)^4

math
I am having a hard time on the ACT with the math have bought several books trying to learn the math and need some help please take the ACT sat. and again on the 23rd have to get good score to start classes in august

sociology
How have families changed over time and what relationship does this have to population structure? Provide an example on one social institution that has been affected by these shifts in family composition?

chem biochem bio
You have the following stock solutions and solid chemicals in your lab: 1.5M NaCL 0.2M Tris buffer, pH 8.0 10 mg/ml Bovine serum albumin (BSA) MgCl2 (solid, anhydrous) MW = 95.211 g/mole (95% pure) How would you make 250 ml of the following solution??? 0.2M NaCl 0.05M Tris, pH...

math
If you have a class of 45 students and 15 are boys what is the percentage of boys in the class

math/hurry
there are 3 boys for every 4 girls.how many are boys in a class of 42?

math-calculus
Thank you! I initially thought the given rate of 12 cubic feet per minute was dr/dt.

math-calculus
A spherical party balloon is being inflated with helium pumped in at a rate of 12 cubic feet per minute. How fast is the radius growing at the instant when the radius has reached 1 ft?

math
jerrys planning a road trip. the scale on the map is 1 in = 150 miles. jerry has to go 8.3 in what is the distance jerry has to travel

sociology 101
which three of the most important sociological thinkers and use those ideas to explain the Senge, Hawken et al, and Kemmis readings

Physics
Find an expression in terms of M, mu, and theta for the speed of waves on the string.Express your answer in terms of the variables M, mu, theta, and appropriate constants. The picture shown is just of a block with mass m on an inclined frictionless surface at angle theta. the ...

physics
A shell is fired from the ground with an initial speed of 1.58 103 m/s at an initial angle of 31° to the horizontal. (a) Neglecting air resistance, find the shell's horizontal range. m (b) Find the amount of time the shell is in motion. s

physics
A pitcher throws a baseball horizontally from the mound to home plate. The ball falls 0.955 m (3.13 ft) by the time it reaches home plate 18.3 m (60 ft) away. How fast was the pitcher's pitch?

Physics
A laptop computer requires 24 volts to operate properly. A transformer with 500 turns in the primary needs to have how many turns in the secondary to operate the computer from a 120 V source?

Physics
A person walks the path shown below. The total trip consists of four straight-line paths. Path 1 is 30.0 m due east. Path 2 is 200.0 m due south. Path 3 is 140.0 m 30.0° south of west. Path 4 is 170.0 m 60.0° north of west. At the end of the walk, what is the person...

Physics
A submarine dives 96 m at an angle of 24° below the horizontal. What are the two components? x = m y = m

Physics
A shopper pushes a cart 38 m south down one aisle and then turns 90.0° west and moves 25 m. He then makes another 90.0° turn and moves 17 m. (a) What is the largest possible displacement of the shopper? m ° counterclockwise from west (b) What is the smallest possib...

Physics URGENT!!!
A massless spring of constant k =84.8 N/m is fixed on the left side of a level track. A block of mass m = 0.5 kg is pressed against the spring and compresses it a distance d, as in the figure below. The block (initially at rest) is then released and travels toward a circular l...

Physics HELP!
I'm not seeing any help in the related questions!

Physics HELP!
A toy race car starts from rest on a circular track of radius 4.30 m. The cars speed increases at the constant rate of 8.80 m/s2. At the point where the magnitudes of the centripetal and tangential accelerations are equal, determine (a) the speed of the race car. b)the elapsed...

Physics- Elena please help!
Part of a roller-coaster ride involves coasting down an incline and entering a loop 30.0 m in diameter. For safety considerations, the roller coasters speed at the top of the loop must be such that the force of the seat on a rider is equal in magnitude to the rider’s weig...

Physics HELP!
A centrifuge in a medical laboratory rotates at an angular speed of 3500 rev/ min. When switched off, it rotates through 41.0 revolutions before coming to rest. (a) Find the angular speed in rad/s. (b) Find the displacement in radians. (c) Find the constant angular acceleratio...

medical
Mr johnson is admitted to the hospital with chest and epigastic pain. he is evaluated by er department doctor with a diagnosis of rule out myocardial infraction. mr johnson is then transferred to a larger facility for further workup.... What is the ICD-9-CM code for this??

Physics
Two students are on a balcony 24.3 m above the street. One student throws a ball, b1, vertically downward at 15.8 m/s. At the same instant, the other student throws a ball, b2, vertically upward at the same speed. The second ball just misses the balcony on the way down. (a) Wh...

Physics
A peregrine falcon dives at a pigeon. The falcon starts downward from rest with free-fall acceleration. If the pigeon is 66.0 m below the initial position of the falcon, how long does the falcon take to reach the pigeon? Assume that the pigeon remains at rest

Chemistry
A sample of helium has a volume of 325mL and a pressure of 655mmHg. What wll be the pressure if the helium is compressed to 125mL (T constant)?

Physics
Can you help me solve this problem?

Physics
A sailboat starts from rest and accelerates at a rate of 0.18 m/s2 over a distance of 454 m. (a) Find the magnitude of the boat's final velocity. m/s (b) Find the time it takes the boat to travel this distance. s

Physics
Can somebody help me solve this?

Physics
An elevator is moving upward at 1.03 m/s when it experiences an acceleration 0.31 m/s2 downward, over a distance of 0.73 m. What will its final velocity be?

Physics
Can somebody help me solve this?

Physics
A boy sledding down a hill accelerates at 1.65 m/s2. If he started from rest, in what distance would he reach a speed of 7.30 m/s?

physics
can somebody help me solve this?

physics
A bus slows down uniformly from 50.9 km/h (14.1 m/s) to 0 km/h in 27 s. How far does it travel before stopping?

Physics
Runner A is initially 3.4 km west of a flagpole and is running with a constant velocity of 5.2 km/h due east. Runner B is initially 5.6 km east of the flagpole and is running with a constant velocity of 5.0 km/h due west. What will be the distance of the two runners from the f...

TRIG
find the degree measure of a central angle subtended by an arc of 8.00cm in a circle with circumference 20.0cm

Physics
A ball is attached to a paddle by a rubber band. The ball is initially moving away from the paddle with a speed of 4.0 m/s. After 0.2 seconds it is moving towards the paddle with a velocity of 3.5 m/s. What is the average acceleration in m/s2 during this time?

Physics
Approximately 4x10^9 kg of matter is converted into energy in the sun per second. Express the power output of the sun in watts.

accounting
1. Use the general journal to journalize the following transactions completed during July of the current year. 2. Post from the general journal to the general ledger. Using the following steps. a. A. Write the current year and July 1 in the Date column. (The account title, Cas...

Math
Can you tell me how you got this answer? I don't understand the example. I'm sorry. I'm not good at this.

Math
Determine if the following statement is true. For any numbers a and b, if a > B, then a2 > b2. Give a justification for your response. I'm so confused on this one too. I'm trying to find help in my book but cannot understand.

geometry
Let "p = I did my homework" and "q = i passed the exam". Write the statement p->q. Then find the inverse, converse, and contrapositive. I'm lost on how to do this.

Math
how do I figure out which slide has more slope if a slide is 1:4 and the other slide is 4:1

algebra 2
If you were to use the substitution method to solve the following system, choose the new equation after the expression equivalent to x from the first equation is substituted into the second equation. x + y = 2 3x + 2y = 9

Humanities
Ok, another question. What is an annotated bibliography? I understand what citing work is, but how does annotated bibliography fit in? To me, it looks like you basically copy and paste the authors work, and then in a paragraph before pasting it, you cite it. Is that correct?

Humanities
Ok, thank you for your help!

Humanities
Good point. Thank you! Anything else you think I need to hit on? I'm not sure I'll be able to make the 7-10 page requirement. Are there any good sites that are credible for citing?

Humanities
I'm writing a paper for humanities class. it has to be in APA annotated bibliography format. Here's the question: Discuss the relationship between art and religion among the various different cultures the course has touched upon. Consider such media as sculpture, paint...

chemistry
Thank You Very !

chemistry
could yo explain part b?

chemistry
5.97 1/hour

chemistry
The first-order rate constant for photodissociation of A is 5.97 1/h. Calculate the time needed for the concentration of A to decrease to the following quantities. a. 5% of its original value h b. one-third of its initial concentration h

Chemistry
Consider the following unbalanced equation. H1+(aq) + Fe(s) H2(g) + Fe2+(aq) What is the balanced oxidation half-reaction? What is the balanced reduction half-reaction? What is the balanced overall cell reaction?

science
Mountains produced by tensional stress, like the Teton Range in Wyoming, are called

Math
thank you so much!

Math
Someone please help! Have spent ages stressing over this and still can't figure out how to do it! need asap. Question 3. In ecology, the logistic equation is often written in the form dN divided by dt = rN(1-N/K) where N = N(t) stands for the size of the population at time...

Chemistry
Sorry got the questions mixed, i know this one because there was a table provided. But how do i find... Consider the following reaction: A to 2C The average rate of appearance of C is given by delta C divided by delta t. Comparing the rate of appearance of C and the rate of di...

Chemistry
HELP! :) Consider the following reaction: 3A to 2B The average rate of appearance of B is given by deltaB divided by delta t. Comparing the rate of appearance of B and the rate of disappearance of A, we get Delta B divided by Delta t= ___* (-delta A divided by delta t) Thanks!

Art
how is cubism considered an emotional approach?

Art
Hello, i am suppose to look at the artwork, Winged Genie Fertilizing a Date Tree. I have to identify the elements of art in this sculpture. I said the elements of art used in this sculpture are form, texture, shape, and line. Am i right? Did i leave anything out? Thank you.

Fine Arts
Ok i basically finished it, but i need to know what the painting means, and what the mood of the painting is. Now i think the painting means how shes thinking about her existence, and the skull represents death, but i dont know what the flame represents. As for the mood, im no...

Fine Arts
Alright thank you, Yeah Its just hard to understand art sometimes, but ill let you know if i need more help, but i think i got it from here! :)

Fine Arts
I have all the elements down, im just struggling on analysis, like where i have to describe how the elements of art, and principles of art are used. I have no idea how they're used. I know the elements of art are like different colors and hues and such, and i wrote down li...

Fine Arts
Please i need help, Im trying so hard on this and i just cant do it. Im suppose to look at the painting Magdalene with Smoking Flame by Georges de la Tour, and use the art criticism approach to explain why this piece of art is a success or failure in the art world. I know the ...

Fine Arts
The question asks, What are some of the similarities and differences between scroll paintings in China and Japan. I have the similarities down, but i cant find any differences. Help?

Fine Arts
I also have to compare the similarities and differences between monasticism and feudalism, and i don't know how that's possible because in my book these are the definitions of the two: Feudalism was a system in which weak noblemen gave up their lands and much of their ...

Physical Science
Could use some help. I don't get this: The maintenance department of a botanical garden is monitoring the displacement of statues that have moved by the process of creep. The statues must be straightened when the displacement reaches 15cm to prevent toppling. By measuring ...

Physical Science
Please help me with this. I just don't get it. The average rate of chemical weathering of carbonate rock in an urban area is 2.1 x 10^-3 mm/yr. The depth of lettering of the tombstones shown in the table below was measured in 2010: Date on Tombstone Age (yr) 1910 100 1921 ...

Physical Science
Can't figure this out, HELP!: What is the velocity (v) of a stream with a discharge (Q) of 8.53 x 10^3 m 3/s and a cross-sectional area (A) of 5.27 x 10^3 m2?

Physical Science
Trying to figure this out and can't: The elevation of a streambed is surveyed near a bridge to be 2,367m. At another bridge 12.2km downstream the elevation is 2,232m. What is the gradient of this stream?

Physical Science
I need some help. I have tried working this problem and can't get it. What is the mass of the Sun, in kilograms, based on the revolution period and distance from Venus?

Physical Science
I need some help. I have tried working this problem and can't get it. A class is building a scale model of the planets based on the model of Mercury having a radius 0.5cm. What is the diameter of Saturn for this model?

Physical Science
I need some help. I have tried working this problem and can't get it. A scale model of the solar system is being constructed where 40cm of the model represents 0.5 AU of actual distance. What is the model dimension, in meters, for the distance of Jupiter from the sun?

accounts
solve the following transactions made by jim a contractor january 4 2009. bought 850 stock, trade 10% 5/10 net 60 days. what is the amount due if paid in cash?

English
I am creating a document for my NHS, and I'm trying to use the § sign properly. Can you please tell me how to do so?

Biology
Water is a polar molecule so it can go through the cell membrane but only by the openings/channels. So the answer is B and I also had this question on Study Island.

Physical Science
Thank you!

Physical Science
I balanced Li(s) + Cl2(g)= LiCl(s) to 2Li(s) + Cl2(g)= 2LiCl(s) Now the question is, if you have 39.8g Li, how many moles of LiCl would you have? I am stuck on this part. Any help would be appreciated.

physics
An object of mass M = 4 kg slides from rest a distance d = 2 m down a frictionless inclined plane where it encounters a spring. It compresses the spring a distance D = 1.2 m before stopping. The inclined plane makes an angle q = 20° with the horizontal. a) When the block j...

physics
A physics student pulls a block of mass m = 23 kg up an incline at a slow constant velocity for a distance of d = 4 m. The incline makes an angle q = 25° with the horizontal. The coefficient of kinetic friction between the block and the inclined plane is µk = 0.3. a)...

physics
A 50.2 kg child slides down a water slide with a velocity of 1.1 m/sec at the top. At the bottom of the slide, she is moving horizontally, 1.5 meters above the water. She splashes into the water 2.5 meters to the right of the bottom of the slide. a) Assuming potential energy t...

physics
A 5 kg block is placed near the top of a frictionless ramp, which makes an angle of 30o degrees to the horizontal. A distance d = 1.3 m away from the block is an unstretched spring with k = 3000 N/m. The block slides down the ramp and compresses the spring. Find the magnitude ...

Physical Science
If the light of a monochromatic source has a photon energy of 4.32 x 10-19 J, what is its wavelength in nm?

Physical Science
What is the frequency of a photon of blue light, if it has a wavelength of 440 nm?

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