Thursday
March 23, 2017

# Posts by Kelsey

Total # Posts: 592

A wheel on a game show is given an initial angular speed of 1.33 rad/s. It comes to rest after rotating through 3/4 of a turn. (a) Find the average torque exerted on the wheel given that it is a disk of radius 0.76 m and mass 6.4 kg. ? N·m sorry, I'm having ...
October 22, 2008

A torque of 1.15 N·m is applied to a bicycle wheel of radius 36 cm and mass 0.83 kg. Treating the wheel as a hoop, find its angular acceleration. ?rad/s2 I know accel is alpha times the radius...where does torque tie in?
October 22, 2008

PHYSICS 3
A solid disk (mass = 1 kg, R=0.5 m) is rolling across a table with a translational speed of 9 m/s. a.) What must the angular speed of the disk be? rad/s d.) The disk then rolls up a hill of height 2 m, where the ground again levels out. Find the translational and rotational ...
October 20, 2008

PHYSICS 2
okay so i have mgh =15.1 and i set it equal to KErot + KE trans? 15.1= 1/2[(2/5 X 2 X .08^2) X (1/2 X 2 X v)^2] that right?
October 20, 2008

PHYSICS 2
A 2.0 kg cylinder (radius = 0.08 m, length = 0.50 m) is released from rest at the top of a ramp and allowed to roll without slipping. The ramp is 0.77 m high and 5.0 m long. (b) What is its rotational kinetic energy? ? J (c) What is its translational kinetic energy? ? J How do...
October 20, 2008

PHYSICS 1
thank you so much! i figured it out!
October 20, 2008

PHYSICS 1
When a pitcher throws a curve ball, the ball is given a fairly rapid spin. A 0.15 kg baseball with a radius of 3.7 cm is thrown with a linear speed of 41 m/s and an angular speed of 37 rad/s. Assume that the ball is a uniform, solid sphere. (b) Calculate how much of its ...
October 20, 2008

For some reason everytime I try to calculate the KE rotational I do not get the right answer. The translational speed can be used for V, right?
October 18, 2008

A solid disk (mass = 1 kg, R=0.5 m) is rolling across a table with a translational speed of 9 m/s. a.) What must the angular speed of the disk be? ? rad/s b.) What is the rotational KE of the disk? ? J c.) What is the total KE of the disk? ? J d.) The disk then rolls up a hill...
October 18, 2008

A 2.0 kg cylinder (radius = 0.08 m, length = 0.50 m) is released from rest at the top of a ramp and allowed to roll without slipping. The ramp is 0.77 m high and 5.0 m long. (a) When the cylinder reaches the bottom of the ramp, what is its total kinetic energy? (b) What is its...
October 18, 2008

physics help 2!!
thank you very much, I got the translational, but cant get the rotational. What do I use for v?, do I convert the rad/s?
October 18, 2008

physics help 2!!
When a pitcher throws a curve ball, the ball is given a fairly rapid spin. A 0.15 kg baseball with a radius of 3.7 cm is thrown with a linear speed of 41 m/s and an angular speed of 37 rad/s. Assume that the ball is a uniform, solid sphere. Calculate how much of its kinetic ...
October 18, 2008

A 1.27 kg hoop with a radius of 10.0 cm rolls without slipping and has a linear speed of 1.32 m/s. Find the rotational kinetic energy. Find the total kinetic energy of the hoop.
October 18, 2008

PHYSICS
On a horizontal frictionless table, masses A and B (3 kg, 6 kg) slide to the right and left, respectively. They have speeds of 3 m/s and 1 m/s, respectively. The two masses collide, and bounce off each other. After the collision, they travel in opposite directions at speeds of...
October 15, 2008

physics 3!!**
In a football game, a tackle running at a constant speed of 5 m/s tackles a stationary receiver. The two fly off horizontally at 4 m/s, before they hit the ground and begin to slow down. If the mass of the tackle is 120 kg, a.) What is the mass of the receiver? b.) Calculate ...
October 12, 2008

physics 2!!**
Two ice skaters stand at rest in the center of an ice rink. When they push off against one another the 45 kg skater acquires a speed of 0.71 m/s. If the speed of the other skater is 0.84 m/s, what is this skater's mass?
October 12, 2008

physics!!**
In a typical golf swing, the club is in contact with the ball for about 0.0015 s. If the 45 g ball acquires a speed of 75 m/s, estimate the magnitude of the force exerted by the club on the ball.
October 12, 2008

A skateboarder starts at point A in Figure 8-27 and rises to a height of h = 2.37 m above the top of the ramp at point B. What was the skateboarder's initial speed at point A?
October 8, 2008

At the local playground a child on a swing has a speed of 2.14 m/s when the swing is at its lowest point. (a) To what maximum vertical height does the child rise, assuming he sits still and "coasts"? Ignore air resistance. (b) To what maximum vertical height does the...
October 8, 2008

A 63 kg skier encounters a dip in the snow's surface that has a circular cross section with a radius of curvature of 12 m. If the skier's speed at point A in Figure 8-25 is 7.9 m/s, what is the normal force exerted by the snow on the skier at point B? Ignore frictional...
October 8, 2008

A 0.26 kg rock is thrown vertically upward from the top of a cliff that is 35 m high. When it hits the ground at the base of the cliff the rock has a speed of 28 m/s. (a) Assuming that air resistance can be ignored, find the initial speed of the rock. (b) Find the greatest ...
October 8, 2008

Gil
12-8=4 more black bikes
October 7, 2008

physics 3!! **
A man lifts a 3 kg crate from the floor to a shelf (2 m high) at constant speed*. What was the change in KE of the crate? What is the change in the PE of the crate? If it takes 2 s for the man to lift the crate to the shelf, find the man's power output.
October 6, 2008

physics 2 !!**
A 8 kg crate is placed at rest on an incline plane (s=0.8, k=0.5), whose angle is 60o. It then slides 3 m down the incline. work done by gravity: ?J work done by friction force: ?J Using your results from part a, find the speed of the crate after sliding this distance.
October 6, 2008

physics! **
You raise a bucket of water from the bottom of a deep well. If your power output is 115 W, and the mass of the bucket and the water in it is 3.50 kg, with what speed can you raise the bucket? Ignore the weight of the rope.
October 6, 2008

Math- Conics
What do you do when you have a rotated conic, and you are trying to find the angle and it comes to be tan= undefined. Do I pick 90, or 270?
September 30, 2008

Science/Chemistry
Zn(OH)2 solid (molecular mass = 99.41 amu) is added to 0.500 L of 0.50 M HBr. The resultant solution which is acidic, requires 185 mL of 0.500 M NaOH for neutralization. Calculate the mass (in mg) of Zn(OH)2 that was originally added (problem 53 in Purdue test bank)
September 28, 2008

science/chem
You dissolve 157.1 g of ammonium nitrate in a 250 mL volumetric flask and add water to the mark (call this solution A). You take 30 mL of solution A and place it in a 100 mL volumetric flask and add water to the mark (this is solution B). Next you take 50 mL of solution B and ...
September 28, 2008

Science/Chem
1. You dissolve 157.1 g of ammonium nitrate in a 250 mL volumetric flask and add water to the mark (call this solution A). You take 30 mL of solution A and place it in a 100 mL volumetric flask and add water to the mark (this is solution B). Next you take 50 mL of solution B ...
September 28, 2008

Science/CHEM
Part 1 Chapt 4 1. You dissolve 157.1 g of ammonium nitrate in a 250 mL volumetric flask and add water to the mark (call this solution A). You take 30 mL of solution A and place it in a 100 mL volumetric flask and add water to the mark (this is solution B). Next you take 50 mL ...
September 28, 2008

physics 3
Static and Kinetic Friction: A 10 kg crate is at rest on a horizontal table (s =0.8, k =0.4). Then various amounts of horizontal pushing force are applied to it. a.) The largest pushing force that can be applied before the crate starts moving is of size: N b.)-d.) If the ...
September 23, 2008

physics
A crate of mass m (=40 kg) is placed at rest on a (frictionless) inclined plane, which has an angle (= 30o) above horizontal. a.) The force of gravity on the crate is: b.) The normal force on the crate is: size: N c.) The net force on the crate is: size: N direction: d.) How ...
September 23, 2008

science
a graduated cylinder has a mass of 50.35g when empty. If 20mL of mercury with a density of 13.6g/mL is added to the graduated cylinder, what will be the total mass of the cylinder and mercury?
September 16, 2008

Math
what is the longest multiplication combination for 120
September 3, 2008

english
what part of speech is about? what part of speech is (is)?
September 2, 2008

English
what part of speech is all
September 2, 2008

algebra
How do you solve or what step do you take? do you divide 96 by 6 then you get 16 then what do i do?
August 27, 2008

algebra
Same question as katie, a cubic storage box is made with 96sq ft of wood. What is the length of each edge? if you use V=s3 How do you find s?
August 27, 2008

science
What is electricity? and how are nuckears involved?
June 28, 2008

English
How do I write a movie title in an essay? I am trying to write about the giant keyboard in the movie BIG. Do I put quotes around the movie title or italicize it? Thank you!
June 1, 2008

science
found it rats but thanks
May 29, 2008

science
What mammal order has the following dental formula 006/406
May 29, 2008

Elglish
What are all of the sigular and plural pronouns?
May 19, 2008

Math
How would I graph the inequality x<2y-y^2 or is there even a way that I could graph it?
May 18, 2008

Math
I need help with these probability problems. 1). Five chips are selected from a bag without replacement. The bag originally contained 6 yellow chips and 8 red chips. In how many ways can you choose 5 chips from the bag? I did 14 C 5 and got 2002, is that correct. 2). In how ...
May 16, 2008

Math
I need help with this problem: Two planes start from Los Angeles International Airport and fly in opposite directions. The second plane starts ½ hour after the first plane, but its speed is 80 kilometers per hour faster. Find the airspeed of each plane if 2 hours after ...
May 14, 2008

Pre-Calculus
I need help solving this logarithmic equation: ln x + ln (x+3) = 1. I know ln x + ln (x+3)=ln [x(x+3)] and that is ln x^2 + 3x when broken down. Then you have to get rid of ln by taking the natural base e of both sides so in the end you have x^2+3x = e^(1). That's when I ...
May 3, 2008

British Literature
According to the characters in the book, their lives have been improved. Through genetic engineering everyone is conditioned to love their job, social class, and lifestlye they are "destined" to have. Reading, I think it ways it has improved; however, this presents ...
April 28, 2008

Math
How would I find the expression of the nth term sequence given the terms of 2, 1, 4/5, 5/7, 6/9 and the expression of the nth term sequence given the terms of 1/2,-1/4,1/8, -1/16?
April 22, 2008

math riddle ALGEBRA WITH PIZZAZZ
her brother said he want him red handed
April 6, 2008

Algebra
You're supposed to graph each equation when, 2x+3y=9
March 24, 2008

earth
thank you
March 9, 2008

earth
What happens when a cold surface water current collides with a warm surface water current?
March 9, 2008

Math
A particle is moving at some constant speed. Use the following information to answer the following questions. s(t)=100/t©÷+12; t¡Ã0; see represents feet and t represents seconds a)Find the velocity and acceleration equations for this particle. b)When ...
March 6, 2008

Chemistry
How would you prepare 1.00L of 0.13m solution of sugar, C12H22O11? The density of the resulting solution is 1.10g/mL. m=molality
February 26, 2008

Chemistry
How can Nitrogen and oxygen form nitrogen dioxide if both nitrogen and oxygen have a negative charge?
February 13, 2008

world history
Does this sound good so far? i need an opinon I researched the genocide in Rwanda for my paper. In Rwanda, there are two major groups: The Hutu and the Tutsi. Even though the Hutu mad up 90% of the population in Rwanda, the Tutsi were basically the aristocrats of the country. ...
October 29, 2007

Social Science
What are the most important facts to include when writing an essay on the genocide in Rwanda?
October 29, 2007

english
yea, i guess it would be considered fate, because no matter what sandra bullok (the main character)did, her husband ended up dying anyways
October 29, 2007

biology
WHAT IS THE DIFFERENCE BETWEEN COVALENT BONDING AND IONIC BONDING????
October 23, 2007

CHEM
I tried your answer exactly as you put it, and it was still wrong. The correct answer that m.c. gave me is 7.8*10^-2
October 1, 2007

math
what number is halfway between -2 and 4
September 23, 2007

gerund phrases
Thank you!
September 21, 2007

gerund phrases
The question is: The fact that the girls danced in the woods outrages Parris. I have to change "the fact that the girls danced in the woods" to a gerund phrase and I can't think of anything that sounds right. Thank You!
September 21, 2007

Verb tenses
The question I need help with says "rewrite the following sentences, correcting errors in sequence of verb tenses" and the problem I have is : "Dr. King discussed the three ways in which people dealt with oppression in the past." I don't see anything ...
September 18, 2007

english-iambic tetrameter
thank you very much, Ms. Sue! Have a wonderful day!
September 5, 2007

english-iambic tetrameter
I have to write two lines of poetry in iambic tetrameter and I am not sure if this is correct or not. Any help would be greatly appreciated! with heavy hearts untwine ourselves yet midnight orbs demand I stay Thank you!
September 5, 2007

history
in the revolutionary war. was the south fighting with the british against the other colonies? because i read that south kept the british religion
September 3, 2007

history
was it the revolutionary war?
September 3, 2007

history
That's just what I can't find information about. I'm not sure what happened in the colonies that would have developed the other states.
September 3, 2007

history
im doing and english essay, and i have to answer this question. How do the differences in the original 13 colonies lead to the development of "the north" and "the south"?
September 3, 2007

math
how many cm is 100mm? Also, if it is 5 over 9-9 over 9 how do you subtract?
August 30, 2007

english-silent e?
I was wondering how do I tell when a word has a silent e in it? Does the word 'welcome' have a silent e in it? Thank you! Yes, the word, welcome, has a silent "e". These three sites will help you with rules for silent "e's". http://www.starfall....
June 2, 2007

Biochemistry
0.800 M
May 23, 2007

The Great Gatsby
i need answers to these ?s below about Great Gatsby.. any of the answers would be nice and ill do anything PLEASE!! Chapters 4-6 ?s In Chapter 5, Gatsby's dream seems to be coming ture. What indications are there, though, that reality cannot satisify his dream? The ...
May 17, 2007

English
caribou
April 23, 2007

social studies
which pharaoh believed in only one god?????? Check this site. http://www.heptune.com/Akhnaten.html
April 9, 2007

Social studies
What are alot of items needed in the afterlife??????? i need lots of ideas!!!!!!!!! Items needed in the afterlife???? If something is dead, then depending on how one believes, all will be provided or you won't need anything. I am not sure what your question relates to.
April 9, 2007

Social studies
an early board game in which players moved their counter around the squares?????? Thank you for using the Jiskha Homework Help Forum. Have you investigated the Egyptian sites Bob Pursley gave you this morning? I listed them for someone else on that site. Now, are you STILL ...
April 9, 2007

social studies
What is a mixture of sand, lime, and water that is used as a lubricant to move stones in ancient Egypt???? I don't know that it was. Lime was not available to the Ancient Egyptians, however, gypsum was. They used a mortar of gypsum, sand, and water to cement stones ...
April 9, 2007

scocial studies
What substance was used to stuff the nostrils of a mummy? http://www.jiskha.com/display.cgi?id=1170947850 substance used to stuff nostrils of mummies
April 9, 2007

Sentence Structure : English
Can you please tell me if this is a simple, compound, complex or compound-complex sentence. And can you please tell me why it is the one it is like if it's because there are two dependent clauses or whatever the case may be. The sentence is : Zhang Jie wrote in China after...
April 2, 2007

science
light affected by gravity in einsteins general theory of relativity Look below at yopu previous post. I tried again
April 1, 2007

Science
True or False: Einstein's general theory of relativity explains that light is unaffected by gravity. Fill in the Blank: Newton's law of says that the gravitational force between 2 objects is proportional to the quantity of their masses and inversely proportional to the...
April 1, 2007

English
I just finished reading "By the Waters of Babylon" by Stephen Vincent Benet and I have no idea what any of it means. I don't understand where the narrator came from (i mean from what country or state), what the metal is that the priests take from the houses of ...
March 21, 2007

math
how do u do this crapp
March 7, 2007

Science
what is the define?
February 20, 2007

science
the smallest part of a compound?
February 20, 2007

social studies
Why should the 3 R's be rehabilitated? Thank you for using the Jiskha Homework Help Forum. If, by the 3 R's, you mean "Reading, Riting, Rithmetic" you would be illiterate without them. Aside from their being so much enjoyment in reading, what would happen if ...
February 11, 2007

Geography/Auto Industry
Name at least three products that are used to manufacture automobiles or trucks? What government imposed barriers stop or hinder the export of automobiles? copper, aluminum, iron, glass, foam, paint, plastic, Export from the US or to the US? Please restate your question! ...
January 29, 2007

articles of confederation
what are the features of the articles of confederation? Here is a site with a copy and an explanation. http://en.wikipedia.org/wiki/Articles_of_Confederation well kelsey...........your a retard ask ur teacher!!!!!!!!!!!!!!1
November 6, 2006

math question
hi, i have a math question that i need help with: when data are non-numerical but can be ordered, such as letter grades, the mean cannot be calculated directly; but both the median and mode can be found. Last year in Ms. Flag's history course, the final grades were 8A'...
August 29, 2006

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