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May 1, 2016

Search: A force of 5.0 is required to stretch a certain spring by 1.2 .How far must this spring be stretched for its potential energy to be 0.015 ?

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physics
With brakes fully applied, a 1660 kg car decelerates from a speed of 74.0 km/hr. What is the work done by the braking force in bringing the car to a stop? What is the change in the kinetic energy of the car?
February 20, 2012 by Katie

physics
A 747 jetliner lands and begins to slow to a stop as it moves along the runway. The mass is 3.1 105 kg, its speed is 25.5 m/s, and the net braking force is 4.24 105 N.(a) What is its speed 7.45 s later?How far has it traveled in this time?
October 3, 2011 by john

physics
A 747 jetliner lands and begins to slow to a stop as it moves along the runway. If its mass is 3.5 x 10 exponent 5 kg, its speed is 27.0 m/s and the net braking force is 4.30 x 10 exponent 5 N, (A) what id its speed 7.50 s later? (b) how far has it traveled in this time?
November 1, 2011 by anna

Physics
A 4 kg block resting on a horizontal surface is attached to an 8 kg block that hangs freely by a cord passing over a frictionless pulley. The coefficient of kinetic friction between the block and the horizontal surface is 0.4. Find the acceleration of the blocks and the ...
November 18, 2006 by Vv

physics
A 60 kg student does 60 push ups in 40s . With each push up , the student must lift 70% of the body mass a height of 40cm off the floor. Assuming two significant digits, calculate the following The work the student does against a force of gravity for each push up , assuming ...
April 25, 2012 by Melissa

chem
3 Ce4+(aq) + Cr(s) 3 Ce3+(aq) + Cr3+(aq) What is the emf of this cell when [Ce4+] = 2.9 M, [Ce3+] = 0.11 M, and [Cr3+] = 0.015 M?
April 16, 2013 by sarah

physics
A sled with a weight of 200N is being pulled from rest by a force of 40 N across ice which has a coefficient of kinetic friction of ,070. If air resistance is negligible, find the acceleration of the sled. How far will the sled slide in 6 Sec?
September 15, 2010 by K. Polska

chemistry
calculate the energy required to raise the temp. of 170.0 g of silver (specific heat = .24 joules/celsius times grams) from 273K to 301K. I know the equation and I got 1142.4 joules but need to get to 2 sig figs, so I converted it to 1.1 x 10^4 which is right, but it doesn't ...
November 6, 2007 by Avonlea

physics
A motor car in rectilinear motion steadily decelerates to rest in 20s.Using Newton's second law of motion,explain why a higher force is required to stop the car in 10s than in 20s.
November 8, 2011 by Marnal

physics
A 5.05kg sits on a ramp that is inclined at 36.5 degrees above horizontal.The coefficient of kinetic friction between box and ramp is mu k= 0.25. What horizontal force is required to move the box up the incline with a constsant acceleration of 4.3m/s^2?
March 15, 2013 by Anonymous

physics
An inclined plane rises to aheight of 2 m over adistance of 6 m. Calculate: 1.The ange of the slope 2.The VR (and so IMA) of the inclined plane. 3The theoretical force required to push an object with a mass of 200 Kg up the slope.
March 5, 2015 by Yared moges

physics
an ice skater spins about a vertical axis at an angular speed of 15 rad/s when her arms are outstreched . she then quickly pulls her arms into her sides in a very small time interval so that the frictional force due to ice are negligible.her initial moment of inertia about the...
February 11, 2012 by ashely

Physics
Consider a coin which is tossed straight up into the air. After it is released it moves upward, reaches its highest point and falls back down again. Air resistance can be neglected. What force acts upon the coin while it moves upward after it is released? a. Force of zero b. ...
June 30, 2013 by Jill

physics
at what angle must the two forces of 50 newton and 120 newton be acting so as to balanced by a force of 130 newton?
May 22, 2012 by anupriya

physical
a boy pushes a shopping trolley weight due to gravity of 150n with a constant force of 75n.a constant force of 20n is present.draw labeled force diagram to identify all the force acting on the shopping trolley.
February 25, 2015 by bongani

physics
A person pushes a 10 kg box from rest and accelerates it to a speed of 3.2 m/s with a constant force. If the box is pushed for a time of 2.6 s, what is the force exerted by the person? force*time=mass*changeinvelocity solve for force.
December 16, 2006 by mel

Physics - Second Law Question
the space shuttle engines cause an upward force of 3 x 10 ^5 N to act on the shuttle. gravity pulls down on the shuttle with a force of 1.96 x 10^5 N. what is the net force on the shuttle? what is the direction of the net force?
October 15, 2014 by Tom

Science (big idea of energy)
What is the big idea of energy????? It says : for level 6: "Explained the reaction using the big idea of energy" what does it mean by the big idea of energy????
October 1, 2007 by person

Physics
The energy of the nth excited state of a hydrogen atom is proportional to 100 - (100/n2). 1) Using this formula, calculate the energy of the first five energy states. 2) How many spectral lines are possible for the transition of a photon in the n= 5 state to ground?
April 14, 2008 by CGUFF

Physics
Joan comes across a deep ravine. She was planning on this as she packed a 3.8 m portable telescoping extension ladder. It has a mass of 15 kg. She was told that in order to get to the skulls last known location, she must get across this 2 m gap. --- | \3.8m | \ __|_2m\____ (...
November 26, 2015 by Lilly

Math
green park is adding 236 plants this spring. One hundred fifty of them will flower. The rest will not flower. Use this information to answer question. 1) 1/3 of the flowering plants will have yellow flowers and 1/4 of the flowering plants will have white flowers. What fraction...
February 26, 2015 by Cheryl H.

Math
What graph would be the best for this problem: The following are prices (in dollars) 2004 automobiles, as listed in a sale ad in the automobile section of the newspaper: 12,997 14,891 18,666 21,799 17,495 17,266 21,517 14,414 14,257 15,634 15,734 27,825 28,015 19,514 14,182 19...
November 1, 2009 by Anonymous

physics
A boy exerts a force of 210 N on a lever to raise a 1.25 103 N rock a distance of 12 cm. If the efficiency of the lever is 88.7%, how far did the boy move his end of the lever? Thanks for all your help :) <3, PhysicsCrazy<3
March 2, 2012 by PhysicsCrazy<3

mechanics
A man begins to climb up a 12-ft ladder . The man has mass 80 kg, while the ladder has mass 10 kg. The wall against which the ladder rests is very smooth, which means that the tangential (vertical) component of force at the contact between ladder and wall is negligible. The ...
December 6, 2015 by sana

physics
a sluice gate consists of a quadriant of a circle of radius 1.5m pivoted at its center 0. When the water is level with the gate, calculate the magnitude and direction of the resultant hydrostatic force on the gate and the moment required to open the gate.The width of the gate ...
January 13, 2016 by shu

chemistry
Thimerosal is an organic compound (gram molecular mass = 404.8 g/mol) used to inhibit bacterial growth. A .100%solution of thimerosal is sometimes used as an antiseptic. Assume that this solution has a density of 1.00 g/mL. A. how many grams of thimerosal are found in .500 g ...
April 7, 2013 by Tyler

Math
There are four people that want to cross a bridge. Sam can cross in 1 minute, Joe can cross in 2, Jack can cross in 5, and Steve can cross in 10. They have one flashlight, and two can cross at a time, but they must go at the same pace. So if Steve and Sam cross together, they ...
February 26, 2012 by Jacob

physics
A force of 1.35 newtons is required to accelerate a book by 1.5 meters/second2 along a frictionless surface. What is the mass of the book? 0.45 kilograms 0.90 kilograms 1.35 kilograms 1.5 kilograms 1.8 kilograms
October 27, 2014 by jerome rice

physics
Mary and John are on opposite sides of a seesaw. Mary has 3x the mass of John. If Mary is sitting at a distance of .5m from the fulcrum, how far must John site in order to keep it balanced.
October 27, 2010 by help

Physics
A 4.1 kg bundle starts up a 31 incline with 148 J of kinetic energy. How far will it slide up the incline if the coefficient of kinetic friction between bundle and incline is 0.39?
April 7, 2013 by Ariana

College Physics
The triangle is an equilateral triangle: 20 cm x 20 cm x 20 cm. What is the value of the electric potential at the center of the triangle if q1= 5.0 nicroC , q2= 5.0 microC, q3= -4.2 microC? V = 4.52 x 10^5V but I can not get this answer. What is the value of the electric ...
January 31, 2010 by Lanise

AP PHYSICS
A hydraulic lift consists of a platform that is supported by a cylindrical piston, which resides in a tube connected to a reservoir of hydraulic fluid. The piston and platform have a mass of 300 kg. The input force is generated at a smaller piston connected to the same ...
December 9, 2010 by Anonymous

Physics
A hydraulic lift consists of a platform that is supported by a cylindrical piston, which resides in a tube connected to a reservoir of hydraulic fluid. The piston and platform have a mass of 300 kg. The input force is generated at a smaller piston connected to the same ...
December 9, 2010 by Sam

physics
A 60 kg woman and an 85 kg man stand 9.0 m apart on frictionless ice. (a) How far from the woman is their CM? (b) If each holds one end of a rope, and the man pulls on the rope so that he moves 1.1 m, how far from the woman will he be now? (c) How far will the man have moved ...
February 27, 2012 by Ashley

calculus
A vector field with a vector potential has zero flux through every closed surface in its domain. it is observed that although the inverse-square radial vector field F = (e^r)/(p^2) satisfies div(F) = 0, F cannot have a vector potential on its domain {(x,y,z)does not equal (0,0...
October 25, 2009 by Tom

Physics -Impulse-
1.)A 0.5 kg hockey puck moving at 35 m/s hits a straw bale, stopping in 1 s. a) What impulse is delivered to the ball? b) What force is exerted on the puck? 2.) A racing car with a mass of 1400 kg hits a slick spot and crashes head-on into a concrete wall at 50 m/s, coming to ...
February 24, 2013 by Isis

English
(1) Brenda would have liked to have taken her vacation at the beach. (2) However, the weather forecast on the television called for rain. (3) Also, her fianc, Max, wanted to vacation in the mountains. (4) After a heated discussion, Brenda and Max decided to compromise. (5) ...
July 28, 2014 by Shayna

physics... PLEASE HELP
A typical laser used in introductory physics laboratories produces a continuous beam of light about 1.0 mm in diameter. The average power of such a laser is 0.75 mW. (i) What is the average intensity? (ii) What is the peak intensity? (iii) What is the average energy density of...
October 15, 2014 by maranda

physics
A car is rounding a circular curve of radius r on a banked turn. As the drawing indicates, there are two forces acting on the car, its weight mg and the normal force FN exerted on it by the road. Which force, or force component, provides the centripetal force that keeps the ...
June 1, 2014 by sally

chemistry
What is the difference between the ionization energy of inner-shell electrons and the ionization energy of outer-shell electrons? A. The ionization energy of inner-shell electrons is less than the ionization energy of outer-shell electrons. B. They are equal to each other. C. ...
December 12, 2014 by Morgan

Chem/ Calculating Lattice Energy, Vapor Pressure
How do you calculate lattice energy? I have to place the following in order of decreasing magnitude of lattice energy, but I don't know how to do it. KF MgS RbI Is there a formula or some simple way of knowing which has the greatest energy? 2. I also have the same question, ...
December 6, 2012 by Danya

Chem- Dr bob! or GK!
Calculate the energy that must be removed to convert substance X from a gas at 116C to a solid -44.6C. Assume X has a molar mass of 75.0 g/mol. Hvap 20. kJ/mol C(s) 3.0 J/gC Hfus 5.0 kJ/mol C(l) 2.5 J/gC bp 75C C(g) 1.0 J/gC mp -15C please help! what formulas do i ...
November 29, 2008 by Rachelle

Chemistry
At room temperature, the surface tension of water is 72.0 mJm^2. What is the energy required to change a spherical drop of water with a diameter of 1.80 mm to three smaller spherical drops of equal size? The surface area of a sphere of radius r is 4πr^2 and the volume ...
November 13, 2012 by Anonymous

Chemistry Help
At room temperature, the surface tension of water is 72.0 mJm^2. What is the energy required to change a spherical drop of water with a diameter of 1.80 mm to three smaller spherical drops of equal size? The surface area of a sphere of radius r is 4πr^2 and the volume ...
November 17, 2012 by Anonymous

physics
Four charges are arranged at the corners of a regular tetrahedron (a pyramid with four sides that are identical equilateral triangles). The charges are 1 Coulomb each, and the sides of the tetrahedron are all 1 meter. How much energy in Joules is required to assemble this ...
November 11, 2013 by Anonymous

Physics
A 50 kg satellite circles the earth in an orbit with a period of 110 min. What minimum energy E is required to change the orbit to one with a period of 320 min? Assume both the initial and final orbits are circular. The Earths radius is 6.37 10^6 m, its mass is 5.98 10^24...
January 30, 2015 by Steven

Chemistry
The presence of a catalyst provides a reaction pathway in which the activation energy of a certain reaction is reduced from 125 kJmol-1 to 75 kJmol-1. (a) By what factor does the rate of the reaction increase at 293 K, all other factors being equal? (b) By what factor would ...
June 28, 2013 by Sara

PHYSICS
A car is safely negotiating an unbanked circular turn at a speed of 29 m/s. The road is dry, and the maximum static frictional force acts on the tires. Suddenly a long wet patch in the road decreases the maximum static frictional force to one-ninth of its dry-road value. If ...
October 2, 2012 by Lindsay

Physics
A car is safely negotiating an unbanked circular turn at a speed of 18 m/s. The road is dry, and the maximum static frictional force acts on the tires. Suddenly a long wet patch in the road decreases the maximum static frictional force to one-ninth of its dry-road value. If ...
September 25, 2014 by Anon

physics
. A car is safely negotiating an unbanked circular turn at a speed of 19 m/s. The road is dry, and the maximum static frictional force acts on the tires. Suddenly a long wet patch in the road decreases the maximum static frictional force to one third of its dry-road value. If ...
October 22, 2014 by vik

logic
Aron: The two double A batteries in my CD player are dead, so the CD player doesnt work. My television remote control, which also uses two double A batteries, works fine. So if I move the two batteries from my television remote control to my CD player, the CD player will ...
June 2, 2015 by Anonymous

chem
1. A 4.61 g sample of one of the substances listed in the table below was heated from 21.3C to 315.7C, requiring 190 J to do so. What substance was heated? I got mercury(l) 2. Calculate the energy required in joules and calories to heat 33.9 g of aluminum from 30.7C to 42.8...
January 27, 2015 by james

Physics
An -particle has a charge of +2e and a mass of 6.64 10-27 kg. It is accelerated from rest through a potential difference that has a value of 1.10 106 V and then enters a uniform magnetic field whose magnitude is 3.10 T. The -particle moves perpendicular to the magnetic field ...
February 6, 2012 by DCM

Physics
An -particle has a charge of +2e and a mass of 6.64 10-27 kg. It is accelerated from rest through a potential difference that has a value of 1.16 106 V and then enters a uniform magnetic field whose magnitude is 3.00 T. The -particle moves perpendicular to the magnetic field...
March 25, 2013 by Don

Dynamics
a 1500 kg automobile is travelling upto 20 degrees inclined at a speed of 6m/s. if the driver wishes to stop his car in a distance of 5m, determine the frictional force at pavement which must be supplied by rear wheels
July 31, 2012 by vikrant

dynamics
A 1500 kg automobile is treveling upto 20 degree incline at a speed of 6 m/s. if the driver wishes to stop his car in a distance of 5 m, determine the frictional force at pavement which must be supplied by rear wheels.
July 22, 2013 by neeraj sharma

Physics
Two small spheres spaced 20.0 centimeters apart have equal charge. How many excess electrons must be present on each sphere if the magnitude of the force of repulsion between them is 4.5710 −21 newtons?
January 24, 2014 by James

physics
. A 90cm uniform lever has a load of 30N suspended at 15cm from one of its ends. If the fulcrum is at the centre of gravity, calculate the force that must be applied at its other end to keep it horizontal
September 27, 2014 by uchenna

Science
trying to lift an 8-N load that is attached to a fixed 2 pulley system. Hands move a distance of 1.6m while the load moves 0.8m, what is the force required to lift the load? I am thinking the the answer is 1.6 divided by 0.8 am i on the right track? what is the formula for ...
February 6, 2013 by Jenn

history
Can someone please help me? :) 1. Which of the following best describes the beliefs of Andrew Jackson? (1 point) States rights should be exercised over federal law. Federal funds should be kept in a national bank. The nation should have a strong federal government. Force ...
January 7, 2014 by Megan

physics
Unless otherwise stated, all objects are located near the Earth's surface, where = 9.8 . A hockey puck with a weight of 0.80 is sliding freely across a section of very smooth (frictionless) horizontal ice. Part A When it is sliding freely, how does the upward force of the ice ...
September 29, 2012 by sammy

Physiology
Can someone direct me on the question below? I am not sure how to work this problem. Thank you. Chambers A and B are separated by a membrane. Chamber A contains 15.7 M KNO3 and chamber B contains 10.98 M KNO3. If K+ is in equilibrium across the membrane, what is the electrical...
August 29, 2012 by Sara Lee

Chemistry
Can someone direct me on the question below? I am not sure how to work this problem. Thank you. Chambers A and B are separated by a membrane. Chamber A contains 15.7 M KNO3 and chamber B contains 10.98 M KNO3. If K+ is in equilibrium across the membrane, what is the electrical...
August 30, 2012 by Sara Lee

Physics
A block of mass m_1 is connected by a string over a pulley to a block of mass m_2 that is sliding on a flat table. The string is light and does not stretch; the pulley is light and turns without friction. The coefficient of friction between the sliding block and the table is...
October 1, 2010 by Anonymous

science
A machine has a mechanical advantage of 2. This means its output force is _____. a. 0.5 times greater than the input force b. 2 times smaller than the input force c. 2 times greater than the input force d. 2 times more efficient than the input force
February 13, 2011 by donna

Physics
Angelito wanted to lose weight by dieting and exercising. One day, he only had a loaf of bread with an energy content of 2.50 x 10^5 J for his breakfast. To exercise, he lifted a 28.34kg to a height of 0.5m. How many times must he lift and lower the barbell to burn 1.25 x 10^4 J?
February 16, 2015 by Jay K Dee

physics
The heating value of a Gas is 39MJm-3 a) If 4.5m-3 of the gas is burned how much energy is released? b) If the gas is burned in 5 minutes what is the power? c) If the burning occurs in an engine that converts the energy to forward motion and the engine is 20% efficient in ...
July 22, 2010 by kirsten

Physics
Having trouble on the question below. Would you do need to convert the km to meters and then multiply (4700*9.8*165500)? The first woman in space, cosmonaut Valentina Tereshkova, flew in 1963. She orbited the earth 48 times during her 70 hour 50 minute flight at an average ...
October 2, 2014 by brandi

Physics Newton law
A 10O0Kg elevator is hoisted upward from rest by a cable. In the first two seconds there is an 1100N tension force in the cable hoisting the elevator. What is the speed after two seconds and how far has it travelled ? Get the acceleration first. Tension=mg + m*acceleration. ...
November 5, 2006 by harry

General Education
<11{2[3(02)26]}> Aron: The two double A batteries in my CD player are dead, so the CD player doesnt work. My television remote control, which also uses two double A batteries, works fine. So if I move the two batteries from my television remote control to my CD player, ...
July 20, 2014 by Tiffany

Physics
A proton moving with a constant speed has a total energy 2.5 times its rest energy. What is the proton's: a. speed b. kinetic energy
May 6, 2009 by Anonymous

Energy Transfer and Heat flow
1. What is entropy? 2.With every energy transfer, what form of energy is always released? I think 2 is Heat?
March 22, 2013 by Stephanie

Chem 130
How does the energy of a principal energy level depend on the value of n? Does a higher value of n mean a higher or lower energy?
May 13, 2014 by michelle

physics
A 4.0 kg block is put on top of a 5.0 kg block. To cause the top block to slip on the bottom one while the bottom one is held fixed, a horizontal force of at least 16 N must be applied to the top block. The assembly of blocks is now placed on a horizontal, frictionless table...
November 20, 2011 by Sadi

Physics
A 59 g particle is moving to the left at 29 m/s. How much net work must be done on the particle to cause it to move to the right at 38 m/s? .....i have tried two different ways and gotten the wrong answer. Kinetic Energy = 0.5 * Mass * (Change in Velocity)^2. Change in ...
November 29, 2009 by Haley

Science
Water is pumped from a stone basin up through a pipe 1 meter high. At that height, the water flows out through a tap and falls down through the air to the basin below, where the cycle begins again. What is the gravitational potential energy of 2.5 kilograms of water at the top...
November 6, 2014 by Macie

chemistry
During the combustion of 5.00g of octane C8H18, 239.5 kcal is released. Write a balanced equation for the combustion reaction. Are reactants or products favored? What is the sign of change of heat for this reaction? how much energy is released by the combustion of 1.53mol of ...
June 7, 2015 by jennifer

Physics plz help
(a) What is the energy of a pendulum (L = 0.9 m, m = 0.4 kg) oscillating with an amplitude of 4.3 cm? (b) The pendulum's energy loss (due to damping) is replaced in a clock by allowing a 2.3-kg mass to drop 1.0 m in 1 week. What percentage of the pendulum's energy is lost ...
June 25, 2012 by Ally

Math
Calculate how long a de-orbit burn must last in minutes and seconds to achieve the Shuttles change in altitude from 205 miles to 60 miles at perigee.Use the equations and conversions provided below in method 1 or method 2 to find the required burn time
February 1, 2013 by katie

Physics
Three forces act on the object.A 3- N force acts due west, and 4-N force acts due south.If the net force on the object is zero ,what is the magnitude of the third force
September 21, 2011 by rally

statistics
in the spring of 2001, a university had 40,000 registered students. to estimate the percentage of all students expecting to graduate in 4 years, a simple random sample of 225 students was drawn, 144 of the sample planned to graduate in 4 years. (a) were the draws made with or ...
May 8, 2014 by anonymous

Algebra
Let g(x) be the indicated combined transformation of f(x) = x. Write the rule for g(x). Horizontal stretch by a factor of 5 followed by a horizontal shift 2 units.
September 18, 2014 by Anonymous

calculus
the graph of y= -1/4 over x-2 can be obtained from the graph y|x| by which transformations? a. 5 units to right b. 2 units to right c. 5 units to left d. 2 units to left by what factor is the graphed streched or shrunk vertically and how is it reflected. a. shrunk verticallyby...
December 18, 2012 by Ladybug

Physics -Impulse-
1.)A 0.5 kg hockey puck moving at 35 m/s hits a straw bale, stopping in 1 s. a) What impulse is delivered to the ball? b) What force is exerted on the puck? 2.) A racing car with a mass of 1400 kg hits a slick spot and crashes head-on into a concrete wall at 50 m/s, coming to ...
February 24, 2013 by Isis

Math
The kingston parks and recreation dept. is planning a new that will be 100 yards long and 85 yards wide. The dept. recommended that the trees be planted along the perimeter of the park at equal distances from each other and as far apart as possible. How far apart can the trees...
December 4, 2006 by Donna

Chemistry
Metals lose electrons under certain conditions to attain a noble-gas electron configuration. How many electrons must be lost by the element Ca? Is it 2 e^-? Which noble-gas electron configuration is attained in this process? argon radon krypton xenon helium neon
October 28, 2012 by Bill

physics
A certain orthodontist uses a wire brace to align a patient's crooked tooth as in the figure below. The tension in the wire is adjusted to have a magnitude of 21.12 N. Find the magnitude of the net force exerted by the wire on the crooked tooth.
October 5, 2011 by sarah

Physics
A certain orthodontist uses a wire brace to align a patient's crooked tooth as in the figure below. The tension in the wire is adjusted to have a magnitude of 12.40 N. Find the magnitude of the net force exerted by the wire on the crooked tooth.
October 13, 2013 by Blue

physics 2
How many electrons must be removed from each of two 5.40kg copper spheres to make the electrical force of repulsion between them egual in magnitude to the gravatational attraction between them?
February 6, 2009 by Brooke

Physics
The 1.4 kg, 40-cm-diameter disk in the figure below is spinning at 260 rpm. How much friction force must the brake apply to the rim to bring the disk to a halt in 4.5 s?
November 18, 2010 by sara

Physics
3.16. An 1100-kg car accelerates from 0 to 30 m/sec in 12 sec. If a frictional force of 200 N opposes the motion, what forces must the wheels exert backward on the pavement to cause this acceleration?
January 23, 2011 by Tezara

physics
how many electrons must be removed from each of the two 5kg copper spheres to make the electric force of repulsion between them equal in magnitude to the gravitational attraction between them?
January 23, 2011 by gyro

Physics
A bridge is 40.0 m. A car weighs 1.5 x 10^4 N and it is parked with its center of gravity located 12.0 meters from the right pier. What upward support force must be provided by the left pier?
April 10, 2011 by Hester

Physics
A sprinter of mass 63.7 kg runs at a constant speed of 10.2 m/s in a straight line. Find the extra force the sprinter must exert on the ground to round a curve of radius 10.8 m.
February 13, 2012 by Anonymous

Physics
A sprinter of mass 63.7 kg runs at a constant speed of 10.2 m/s in a straight line. Find the extra force the sprinter must exert on the ground to round a curve of radius 10.8 m.
February 13, 2012 by Mike

Physics
(a) How high a hill can a car coast up (engine disengaged) if friction is negligible and its initial speed is 96.0 km/h? (b) If, in actuality, a 750 kg car with an initial speed of 96.0 km/h is observed to coast up a hill to a height 18.0 m above its starting point, how much ...
October 17, 2014 by Devin

Physics
A block of mass 2.30 kg is pushed 2.38 m along a frictionless horizontal table by a constant 16.0 N force directed 26.9o below the horizontal. Determine the work done by the applied force. Determine the magnitude of the normal force exerted by the table. Determine the ...
October 1, 2013 by Chris

physics
A block of mass 2.40 kg is pushed 2.09 m along a frictionless horizontal table by a constant 18.6 N force directed 23.7o below the horizontal. Determine the work done by the applied force. Determine the magnitude of the normal force exerted by the table. Determine the ...
October 3, 2013 by beccs

physics
A 600-pound boat sits on a ramp inclined at 30 degrees as shown in the attached image. What force is required to keep the boat from rolling down the ramp? Completely lost, never done physics before....
October 8, 2014 by Eoin

Calculus
A construction company wants to build a rectangular enclosure with an area of 1000 square feet by fencing in three sides and using its office building as the fourth side. Your objective as supervising engineer is to design the enclosure so that it uses the least amount of ...
August 9, 2011 by Joey

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