Wednesday
July 30, 2014

Posts by tim


Total # Posts: 934

physics
A comet orbits the Sun with a period of 72.8 yr. (a) Find the semimajor axis of the orbit of the comet in astronomical units (1 AU is equal to the semimajor axis of the Earth's orbit). (b) If the comet is 0.55 AU from the Sun at perihelion, what is its maximum distance fro...

Physics
I'm supposed to get 3.21e-07 N.

Physics
A carefully designed experiment can measure the gravitational force between masses of 9 kg. Given that the density of iron is 7860 kg/m3, what is the gravitational force between two 9.00-kg iron spheres that are touching in N?

physics
I see, so that's where I messed up. Thank you once again. I get 85.3 N now.

physics
Does θ equal 0.5981 degree and W equal 1.58 m? This is what I'm doing to solve for tension: 1) 1.13T=mg(W/2)cos(θ) 2) 1.13T=(20.8)(9.81) x (1.58/2cos(0.5981)) 3) 1.13T= 1.61.1891373 4) T= 142.6452543 = 143 N Am I calculating something wrong? Am I solving for the ...

physics
Yes. However, I think I hit a wrong number on my calculator before. I still get around 142.6, though.

physics
Sorry I let my friend use my laptop and he must have typed in his into Jiskha. It's still Tim. Sorry for the confusion.

physics
I'm also confused as to why the angle θ is 0.5981. I thought I had to use arctan(1.13/141) which gives me a 38.9 degree angle.

physics
When I try balancing the forces, I end up with T = mg, which gives me an answer which is over twice the correct answer.

physics
A trapdoor on a stage has a mass of 20.8 kg and a width of 1.58 m (hinge side to handle side). The door can be treated as having uniform thickness and density. A small handle on the door is 1.41 m away from the hinge side. A rope is tied to the handle and used to raise the doo...

Physics
I was able to figure this one out with a related question. Thank you!

Physics
A thin uniform rod (length = 1.3 m, mass = 3.2 kg) is pivoted about a horizontal frictionless pin through one of its ends. The moment of inertia of the rod through this axis is (1/3)mL2. The rod is released when it is 50° below the horizontal. What is the angular accelerat...

Trigonometry
When viewing Angel Falls (the world's highest waterfall) from Observation Platform A, located on the same level as the bottom of the waterfall, we calculate the angle of elevation to the top of the waterfall to be 69.30°. From Observation Platform B, which is located o...

Physics
A system consists of two particles. Particle 1 with mass 2.0 kg is located at (2.0 m, 6.0 m) and has a velocity of (3.1 m/s, 2.6 m/s). Particle 2 with mass 4.5 kg is located at (4.0 m, 1.0 m) and has a velocity of (1.1 m/s, 0.6 m/s). Determine the position and the velocity of ...

College Algebra
A gardener wants to fence in her plot in two equal rectangular sections. If she has 120 yards of fence and the area of the entire plot is 384 yd 2, find the possible dimensions in yards of the garden.

chemistry
determine the energy needed to cool 10 grams of H2O from 110 degrees C to -10 degrees C?

chemistry
determine the energy needed to raise the temperature of 10 grams of H2O from 25 degrees C to 75 degrees C?

UoA
356 Cal to kilowatt-hours

Chemistry 2B - UC Davis
Now calculate Kb the base dissociation constant for [C2H3O2-], acetate anion, for each of your trials from the concentrations of species at the equivalence point. Report 3 significant figures, e.g. 5.97E-10.

Physics- Final exam review
A proton with kinetic energy 100 keV is moving in a plane perpindicular to a uniform magnetic field of magnitude 2.3 T. Find the radius of its orbit. Not sure what equation to use or how to solve

Physics- Final exam help
A proton with kinetic energy 100 keV is moving in a plane perpindicular to a uniform magnetic field of magnitude 2.3 T. Find the radius of its orbit. Not sure what equation to use or how to solve.

math
two-thirds of a number, decreased by thirty-six, is at most twenty-two. Find the number.

physics
The red laser light used in supermarket scanners has a wavelength of 633 x 10-9 m. (This is 633 nanometers, 633 nm). Find the frequency of the red laser light.

Math
You have equally likely chance of choosing any number from 1 to 10. What is the probability that you choose a number greater than 6?

physical science
a hammer falls off a rooftop and strikes the ground with a certain kinetic energy. if it fell from a roof twice as tall, how would its kinetic energy compare? explain

College Physics
An electron with a speed of 1.9 × 107 m/s moves horizontally into a region where a constant vertical force of 5.4 × 10-16 N acts on it. The mass of the electron is 9.11 × 10-31 kg. Determine the vertical distance the electron is deflected during the time it h...

Maths
There are two trains. The first train is travelling at 52 km/h. The second train is travelling at 68 km/h. It takes 9 seconds for the second train to pass the first train. How long is the second train?

Biology
If nonessential amino acids are missing from the diet, can essential amino acids be substituted in the protein? I would appreciate some help with this one-thank you

biology
Traits like human height and skin color shows a wide range of phenotypes, as opposed to just two ot three. From the standpoints of genese and alleles, explain why is this so.

MATH
74.25

geometry
Two similar solids have a scale factor of 3:5. If the height of solid I is 3 cm, find the height of solid II. If the surface area of I is 54pi cm squared, find the surface area of II. If the volume of II is 250pi cubed, find the volume of I

math
85%of36145

stats
The vice-president of a business firm has reviewed the records of the finn's personnel and found that 70% of the employees read The Wall Street Journal. If the vice-president was to choose 12 employees at random,what is the probability that the number of these employees wh...

Physics
A bag of blood with a density of 1050 kg/m3 is raised 1.37 m higher than the level of a patient’s arm. How much greater is the blood pressure at the patient’s arm than it would be if the bag were at the same height as the arm? Assume there is no change in drip speed ...

stats
please help How do you construct a pay of table?????? . Dr. Mike Adams, a local brain surgeon, believes there is a lot of money to be made renting apartments to students here in Alamosa. He is considering constructing one, two, or possibly three apartment complexes, each of wh...

math
I want to put a 3ft wide walk around a 10ft by 15 ft pool. What is the perimeter around the figure including the path?

STATS
The vice-president of a business firm has reviewed the records of the firm's personnel and found that 70% of the employees read The Wall Street Journal. If the vice president was to choose 12 employees at random, what is the probability that the number of these employees w...

stats
. Each week during the first half of the semester, a sample of 50 students was polled to determine how many of them had their homework done before class. The following arc the results of the weekly polls: Week # # of students with homework done 1 1 2 8 3 12 4 14 5 22 6 30 7 25...

stats
20. The sponsor of a local soccer tournament is responsible for writing an article for the local paper announcing the 151, 2nd, and3rdplacewinners. If10teamsareinvitedtothe tournament, and the sponsor wanted to get the article written in advance so it can go out in the next mo...

statistics
12. A statistics student received a grade of 85 on a statistics midterm. If the corresponding z score equaled +1.50, and the standard deviation equaled 7, what was the average grade on this exam? a. 95.5 b. 74.5 c. 78.0 d. Cannot determine without knowing how many took the exa...

stats
if one can choose any six of 40 numbers, in any order, to play a state lottery game, how many different arrangments are possible?

physics
A pitched ball is hit by a batter at a 45° angle and just clears the outfield fence, 90 m away. Assume that the fence is at the same height as the pitch and find the velocity of the ball when it left the bat. Neglect air resistance.

physics
A ball rolls with a speed of 6.4 m/s toward the edge of a table that is 0.7 m above the floor. The ball rolls off the table. a. Find the magnitude of the balls velocity when it hits the floor. m/s b. At what angle, measured from the horizontal, will the ball's velocity mak...

Physics resistance question
No drop

stats
The sponosor of a local soccer tournament is responsible for writting an article for the local paper announcing the 1st, 2nd, 3rd place winners.If 10 teamsare invited to the tournament, ans th sponsor wanted to get the article written in adance so it can go out in the next mor...

trig
The minute hand of a clock is 6 inches long. What distance does its tip move in 16 minutes?

psychology
what are some movies that is related to the issues of child development and developmental psychology

psychology
What are some movies that is related to the issues of child development and developmental psychology

Physics
The driver of a truck slams on the brakes when he sees a tree blocking the road. The truck slows down uniformly with acceleration −5.15 m/s2 for 4.20 s, making skid marks 62.1 m long that end at the tree. With what speed does the truck then strike the tree?

Mathamatics 101
An angle is 35 degrees more than 4 times its supplementary angle. Find the measures of the two angles.

chemistry
how much water should i add to neutralize 1000 milliliters oh ph 13

calculus
Find area of the region under the curve y = 5 x^3 - 9 and above the x-axis, for 3¡Ü x ¡Ü 6. area = ??

math 242
It is estimated that the demand for a manufacturer's product is increasing exponentially at an instantaneous rate of 7% per year. If the current demand is increasing by 7000 units per year and if the price remains fixed at $100 per unit, how much revenue will the manufactu...

Biology
Cells absorbing sugar or other small molecules from their surroundings is an example of A. diffusion B.osmosis C. exocytosis D.endocytosis I think it is either C or D because they both have to do with the transportation of molecules in and out of cells.

math
V = pir^2h V = pizza :)

math
The radius r of a sphere is increasing at the uniform rate of 0.3 inches per second. At the instant when the surface area S becomes 100pi square inches, what is the rate of increase, in cubic inches per second, in the volume V?

BUSS/STATS
Steve cutter sells big blade lawn mowers in his hardware store, and he is interested in comparing the reliability of the mowers he sells with the reliability of Big blade mowers sold nationwide. Steve knows that only 15 percent of all Big Blade mowers sold nationwide require ...

bio
How is it possible for an overnourished individual to be malnourished?

Calculus
Thanks again for responding. When we earlier did h=0, the formula was dh/dt=5/2pi=.8 in/min. Intuitively, it makes sense that the rate would reduce as the cup is filling up since the radius is increasing. So, should the answer above have 10 in the numerator instead of 40. Then...

Calculus
A cup has a radius of 2" at the bottom and 6" on the top. It is 10" high. 4 Minutes ago, water started pouring at 10 cubic " per minute. How fast is the water level rising now?

Calculus
In the 2nd question (rate of water rising now), how do you calculate r?

Calculus
OK, I understand now. Thanks for all of your help.

Calculus
Thanks. I think that I understand the 1st question now. How about the other questions?

Calculus
A cup has a radius of 2" at the bottom and 6" on the top. It is 10" high. 4 Minutes ago, water started pouring at 10 cubic " per minute. How fast was the water level rising 4 minutes ago? How fast is the water level rising now? What will the rate be when th...

physics
So I figured this out myself a=v^2/r which is also equal to (4pi^2*r^2)/T^2 and T is 86400 secs which is how long it takes for a day to pass

physics
How would I know W if that wasn't given?

physics
radius of the earth = 6.37 × 10^6 what is the speed of a 90.6 kg person at the equator? I know that F=m(v^2/r) but I don't know the force. Is there another equation that I'm missing or I'm using the wrong one? Thanks

physics
should be 2.24m/s use the equation F=m(v^2/r)

bio
Hi does anyone know where the following lead to/from renal artery and vein hepatic artery and vein umbilical artery and vein coronary

bio
Hi does anyone know where the following lead to/from renal artery and vein hepatic artery and vein umbilical artery and vein coronary

algebra
write an equation of the direct variation that includes the given point, (-5/6, 6/5)

article
articles either about animals or specific ecosystems

article
where can i find articles on the ecosystem ?

6th grade Science
Please help me with the questions? 1) How do you respond to some stimuli in your environment? The examples I wrote are: If I am hungry, I will eat food. If I am cold, then I will put on a jacket? 2) What does the fur of a bear have to do with homeostatis? I wrote that the fur ...

Calculus
its from 1 to 3 on the x axis including when it crosses underneath, you subtract that (its like negative area)

Calculus
Finding area under a curve From [1,3] 2x^2 -4x +1

Physics
Divers dive straight out from a cliff that is 21 m high. If the rocks below the cliff extend outward for 15 m, what is the minimum horizontal velocity a diver must have to clear the rocks safely

ochem
how to determine equivalent hyfrogens in hnmr?

chem
why do we use a weak acid or water and not a concentrated acid with NaBh4,etoh reagent?

Math
The equation y=2x+7 represents a linear relationship that is non-proportional. What changes could I make to the equation to make it proportional? Thanks

Economics
Variable cost divided by the change in quantity produced is A. average variable cost. B. marginal cost. C. average total cost. D. None of the above is correct.

pol sci
what impact is the California dream act( ab 131) going to have on us citizens or legal immigrants?

soc..
write a essay describing de jure segregation include why was it established , what happen with de jure segregation from reconstruction to the civil rights movement , and how was jim crow enforced throughout this period

busi/stats
list 3 ways we can reduce the size of a sample, none of which has any direct relationship to the size of the population

busi/stats
The Quality Assurance Department selected a sample of 12 printed circuit boards and tested them. The number of defects in each circuit board was 3, 3, 0, 5, 1, 1, 5, 6, 6, 2, 0, and 1. What kind of control chart should be constructed to monitor the process? A. Mean chart B. Ra...

Spanish 8th grade
I have to put these in the past tense-Are they correct? 1. Tú hablas por teléfono. Tú habaste por teléfono. 2. Nosostros bailamos mucho los fines de semana. This would be the same in past tense, I think?? 3. Tú y yo cantamos los domingos. Th...

Spanish
Thank you

Spanish
Could you please check these-I had to answer the questions. 1.¿Bailaste ayer? Sí,yo bailé ayer. 2.¿Caminaste a la escuela hoy? Sí, yo caminé a la escuela hoy. 3.¿Visitaste a tus primos el domingo pasado? Sí, yo visit&eacu...

physics
can some one explain how to do this The muzzle velocity of 60g bullet leaving 4kg rifle is 500 m/s towards the east. What is recoil velocity of the rifle?

geometry
if area of triangle wxz is 48 cm squared, x =10 cm, xz = 10 cm, middle =8 cm then what is the perimeter of wxz

stats
The Quality Assurance Department selected a sample of 12 printed circuit boards and tested them. The number of defects in each circuit board was 3, 3, 0, 5, 1, 1, 5, 6, 6, 2, 0, and 1. What kind of control chart should be constructed to monitor the process? A. Mean chart B. R...

stATS
the standard deviation of the sampling distribution of the means is ____the standard deviation of the population under study.

Chemistry 121
Is 450g of oxygen enough to burn 125g of butane according to the following equation? C4H10 + O2 ---> CO2 + H2O? show why or why not?

Chemistry 121
How many grams of KCl would be produced from the complete decomposition of 2.75g of KClO3?

Chemistry 121
How much oxygen would be needed to completely burn 250g of propane?

Calculus
A ship sailing parallel to shore sights a lighthouse at an angle of 12 degrees from its direction of travel. After traveling 5 miles farther, the angle is 22 degrees. At that time, how far is the ship from the lighthouse?

chem
Explain clearly why changes in base concentration do not affect the observed reaction rate of an E1 elimination.

chemistry
12 mL of 0.0100 M HCl are added to 25.0 mL of a buffer solution that is 0.010 M HC2H3O2 and 0.08 M C2H3O2-. What is the pH of the resulting solution?

chemistry-acid/base extraction.
I do not understand acid base extraction. why should we mix, for example, an organic and aqueous compound to then separate them from each other. please explain confused....

Algebra
Find the percent of error of each measurement. 0.2cm 0.4cm

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