Wednesday
May 27, 2015

Posts by Kristyn


Total # Posts: 44

Physics
The drawing shows a circus clown who weighs 750 N. The coefficient of static friction between the clown’s feet and the ground is 0.630. He pulls vertically downward on a rope that passes around three pulleys and is tied around his feet. What is the minimum pulling force ...
April 7, 2015

Physics
During a storm, a tree limb breaks off and comes to rest across a barbed wire fence at a point that is not in the middle between two fence posts. The limb exerts a downward force of 246 N on the wire. The left section of the wire makes an angle of 14.2° relative to the ...
April 7, 2015

Physics
The person in the drawing is standing on crutches. Assume that the force exerted on each crutch by the ground is directed along the crutch, as the force vectors in the drawing indicate. If the coefficient of static friction between a crutch and the ground is 0.705, determine ...
April 7, 2015

Physics
A mountain climber, in the process of crossing between two cliffs by a rope, pauses to rest. She weighs 530 N. As the drawing shows, she is closer to the left cliff than to the right cliff, with the result that the tensions in the left and right sides of the rope are not the ...
April 7, 2015

Physics
A student is skateboarding down a ramp that is 6.03 m long and inclined at 21.5° with respect to the horizontal. The initial speed of the skateboarder at the top of the ramp is 4.87 m/s. Neglect friction and find the speed at the bottom of the ramp.
April 7, 2015

Physics
The alarm at a fire station rings and a 98.5-kg fireman, starting from rest, slides down a pole to the floor below (a distance of 4.00 m). Just before landing, his speed is 1.81 m/s. What is the magnitude of the kinetic frictional force exerted on the fireman as he slides down...
April 7, 2015

Physics
A girl is sledding down a slope that is inclined at 30º with respect to the horizontal. The wind is aiding the motion by providing a steady force of 131 N that is parallel to the motion of the sled. The combined mass of the girl and the sled is 59.9 kg, and the ...
April 7, 2015

Physics
A rescue helicopter is lifting a man (weight = 868 N) from a capsized boat by means of a cable and harness. (a) What is the tension in the cable when the man is given an initial upward acceleration of 1.83 m/s2? (b) What is the tension during the remainder of the rescue when ...
April 7, 2015

Physics
A rescue helicopter is lifting a man (weight = 868 N) from a capsized boat by means of a cable and harness. (a) What is the tension in the cable when the man is given an initial upward acceleration of 1.83 m/s2? (b) What is the tension during the remainder of the rescue when ...
April 6, 2015

Physics
A cup of coffee is on a table in an airplane flying at a constant altitude and a constant velocity. The coefficient of static friction between the cup and the table is 0.420 . Suddenly, the plane accelerates forward, its altitude remaining constant. What is the maximum ...
March 29, 2015

Physics
The drawing (not to scale) shows one alignment of the sun, earth, and moon. The gravitational force that the sun exerts on the moon is perpendicular to the force that the earth exerts on the moon. The masses are: mass of sun=1.99 × 1030 kg, mass of earth=5.98 × ...
March 29, 2015

physics
The steel I-beam in the drawing has a weight of 1.75 × 103 N and is being lifted at a constant velocity. The angles are at 70 degrees. What is the tension in each cable attached to its ends?
March 28, 2015

physics
A cup of coffee is on a table in an airplane flying at a constant altitude and a constant velocity. The coefficient of static friction between the cup and the table is 0.420 . Suddenly, the plane accelerates forward, its altitude remaining constant. What is the maximum ...
March 28, 2015

physics
A 46.2-kg crate rests on a level floor at a shipping dock. The coefficients of static and kinetic friction are 0.566 and 0.440, respectively. What horizontal pushing force is required to (a) just start the crate moving and (b) slide the crate across the dock at a constant speed?
March 28, 2015

physics
The gravitational force that the sun exerts on the moon is perpendicular to the force that the earth exerts on the moon. The masses are: mass of sun=1.99 × 1030 kg, mass of earth=5.98 × 1024 kg, mass of moon=7.35 × 1022 kg. The distances shown in the drawing ...
March 28, 2015

physics
A criminal is escaping across a rooftop and runs off the roof horizontally at a speed of 4.6 m/s, hoping to land on the roof of an adjacent building. Air resistance is negligible. The horizontal distance between the two buildings is D, and the roof of the adjacent building is ...
March 28, 2015

physics
A golfer imparts a speed of 25.8 m/s to a ball, and it travels the maximum possible distance before landing on the green. The tee and the green are at the same elevation. (a) How much time does the ball spend in the air? (b) What is the longest "hole in one" that the...
March 28, 2015

physics
A golfer imparts a speed of 25.8 m/s to a ball, and it travels the maximum possible distance before landing on the green. The tee and the green are at the same elevation. (a) How much time does the ball spend in the air? (b) What is the longest "hole in one" that the...
March 28, 2015

physics
The gravitational force that the sun exerts on the moon is perpendicular to the force that the earth exerts on the moon. The masses are: mass of sun=1.99 × 1030 kg, mass of earth=5.98 × 1024 kg, mass of moon=7.35 × 1022 kg. The distances shown in the drawing ...
March 28, 2015

physics
A golfer imparts a speed of 25.8 m/s to a ball, and it travels the maximum possible distance before landing on the green. The tee and the green are at the same elevation. (a) How much time does the ball spend in the air? (b) What is the longest "hole in one" that the...
March 28, 2015

physics
At an instant when a soccer ball is in contact with the foot of the player kicking it, the horizontal or x component of the ball's acceleration is 930 m/s2 and the vertical or y component of its acceleration is 960 m/s2. The ball's mass is 0.34 kg. What is the ...
March 25, 2015

physics
A fire hose ejects a stream of water at an angle of 31.7 ° above the horizontal. The water leaves the nozzle with a speed of 29.2 m/s. Assuming that the water behaves like a projectile, how far from a building should the fire hose be located to hit the highest possible fire?
March 25, 2015

physics
A fire hose ejects a stream of water at an angle of 31.7 ° above the horizontal. The water leaves the nozzle with a speed of 29.2 m/s. Assuming that the water behaves like a projectile, how far from a building should the fire hose be located to hit the highest possible fire?
March 25, 2015

physics
A golfer imparts a speed of 25.8 m/s to a ball, and it travels the maximum possible distance before landing on the green. The tee and the green are at the same elevation. (a) How much time does the ball spend in the air? (b) What is the longest "hole in one" that the...
March 25, 2015

physics
A tennis ball is struck and departs from the racket horizontally with a speed of 27.7 m/s. The ball hits the court at a horizontal distance of 20.6 m from the racket. How far above the court is the tennis ball when it leaves the racket?
March 25, 2015

physics
A model rocket blasts off from the ground, rising straight upward with a constant acceleration that has a magnitude of 88.6 m/s2 for 1.57 seconds, at which point its fuel abruptly runs out. Air resistance has no effect on its flight. What maximum altitude (above the ground) ...
March 19, 2015

physics
In an historical movie, two knights on horseback start from rest 79.0 m apart and ride directly toward each other to do battle. Sir George's acceleration has a magnitude of 0.319 m/s2, while Sir Alfred's has a magnitude of 0.391 m/s2. Relative to Sir George's ...
March 19, 2015

physics
A tourist being chased by an angry bear is running in a straight line toward his car at a speed of 5.04 m/s. The car is a distance d away. The bear is 17.5 m behind the tourist and running at 7.26 m/s. The tourist reaches the car safely. What is the maximum possible value for d?
March 18, 2015

Chemistry
Consider the reaction when aqueous solutions of manganese(II) sulfate and barium bromide are combined. The net ionic equation for this reaction is:???
November 4, 2012

science
Describe the direaction an object moves looking through the microscope compared to how it is moving on the slide?
September 10, 2012

chemistry
What numbers go where though
February 13, 2012

chemistry
i don't understand how that is the answer. it is supposed to be a number.
February 13, 2012

chemistry
A 300 mL sample of hydrogen gas is at a pressure of 0.500 kPa. If the pressure increases to 0.750 kPa, what will be the final volume of the sample? Assume that the temperature stays constant
February 13, 2012

chemistry
yes it is sorry i did not mean to post this twice
February 13, 2012

chemistry
A 300 mL sample of hydrogen gas is at a pressure of 0.500 kPa. If the pressure increases to 0.750 kPa, what will be the final volume of the sample? Assume that the temperature stays constant
February 13, 2012

Financial Management of Healthcare Organizations
The objective of your Final Project is to identify a company that might be worth much more if it were broken into pieces and valued using EVA analysis separately. The rationale for this difference can perhaps be explained by the difficult investors have valuing companies with ...
December 27, 2010

math
simplify the expression (4+7)x3 write the steps used to simplify.
March 23, 2010

science
What's the value of obserivng actual human specimens
January 21, 2010

Math
We must have the same math book and assignment because I have to research those same exact things! I am finding some information on wikipedia. Just thought I'd let you know. Have you found information anywhere else?
April 7, 2009

Calculus
Find the limit Limit as h approaches 0 of : SqRt(4+h)-2 ____________ h by relating it to the derivative. (Indicate reasoning.)
October 8, 2008

math
In our decimal number system, the value of a digit depends on its place, or position, in the number. Each place has a value of 10 times the place to its right. For example: .1 has ONE place value. .001 has THREE place values. If you are asked to move the decimal 3 place values...
August 4, 2008

bio
during what process does the cell divide into two daughter cells?
May 14, 2008

english help
crydabu need help unscrambling the word ..hint has to be a word related to spring or easterwith spring or easter Thank you for using the Jiskha Homework Help Forum. If you are allowed 2 words, it could be "buy card." Other than that, list the vowels: a, u, possibly y...
March 31, 2007

english
i need help to unscramble this word crydabu..can't figure this one out Try these: http://www.ssynth.co.uk/~gay/anagram.html http://www.unscramble.net =)
March 31, 2007

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