Saturday

September 5, 2015
Number of results: 69,293

**physics**

The coefficients of static and kinetic friction between a 50 kg box and a horizontal surface are 0.64 and 0.17, respectively. (a) What is the acceleration of the object if a 335 N horizontal force is applied to the box? m/s2 (b) What is the acceleration if the applied force is...
*December 18, 2012 by Josh*

**physics**

The coefficients of static and kinetic friction between a 43 kg box and a horizontal surface are 0.72 and 0.20, respectively. (a) What is the acceleration of the object if a 135 N horizontal force is applied to the box? (b) What is the acceleration if the applied force is 480 N
*February 23, 2015 by Bri*

**physics**

A 790kg boulder is raised from a quarry 188m deep by a long uniform chain having a mass of 600kg . This chain is of uniform strength, but at any point it can support a maximum tension no greater than 3.00 times its weight without breaking.
*February 8, 2012 by Andrew*

**mastering physics**

Find an expression for , the tension in cable 1, that does not depend on . Express your answer in terms of some or all of the variables , , and , as well as the magnitude of the acceleration due to gravity .
*March 31, 2011 by Anonymous*

**mastering physics**

Find an expression for , the tension in cable 1, that does not depend on . Express your answer in terms of some or all of the variables , , and , as well as the magnitude of the acceleration due to gravity .
*March 31, 2011 by Anonymous*

**Physics**

A block of mass m = 3 kg is attached to a spring (k = 28 N/m) by a rope that hangs over a pulley of mass M = 7 kg and radius R = 6 cm, as shown in the figure. Treating the pulley as a solid homogeneous disk, neglecting friction at the axle of the pulley, and assuming the ...
*March 27, 2012 by Angelina*

**Physics**

Could someone try helping me solve those 2 questions or write me a formula with equaion what to do , thanks for every bit of help A 600kg elevator accelerates upward from rest for 10 seconds through 40.0meters. Find the cable tension a) 5130 N b) 5400 N c) 6360 N d) 6630 N A ...
*January 27, 2010 by needhelp*

**physics**

Consider the 671 N weight held by two cables shown below. The left-hand cable had ten- sion T2 and makes an angle of 47 with the ceiling. The right-hand cable had tension T1 and makes an angle of 43 with the ceiling. a) What is the tension in the cable labeled T1 slanted at ...
*December 3, 2011 by laura*

**physics**

Consider the 671 N weight held by two cables shown below. The left-hand cable had ten- sion T2 and makes an angle of 47 with the ceiling. The right-hand cable had tension T1 and makes an angle of 43 with the ceiling. a) What is the tension in the cable labeled T1 slanted at ...
*December 3, 2011 by laura*

**calculus**

A projectile is launched from a platform 20 feet high with an initial velocity of 72 feet per second, The height h of the projectile at t seconds after launch is given by h = –16t2 + 72t + 20 feet. (a) How many seconds after launch does the projectile attain maximum height? ...
*March 10, 2012 by Brian*

**physics ! HELP !**

A 65 kg bungee jumper leaps from a bridge. She is tied to a bungee cord that is 11m long when unstretched, and falls a total of 30m . Part a) Calculate the spring constant of the bungee cord assuming Hooke's law applies. part b)Calculate the maximum acceleration she experiences.
*May 23, 2012 by emmie*

**physics.**

Multiple-Concept Example 3 provides some pertinent background for this problem. Suppose a single electron orbits about a nucleus containing two protons (+2e), as would be the case for a helium atom from which one of the naturally occuring electrons is removed. The radius of ...
*February 11, 2009 by Jordan*

**Physics**

Multiple-Concept Example 3 provides some pertinent background for this problem. Suppose a single electron orbits about a nucleus containing two protons (+2e), as would be the case for a helium atom from which one of the naturally occuring electrons is removed. The radius of ...
*February 11, 2009 by Sarah*

**physics**

Two teams of nine members each engage in a tug of war. The first team's members have average masses of 64 kg and exert average forces of 1350 N horizontally. The second team's members have average masses of 69 kg and exert average forces of 1371 N horizontally. (a) What is the...
*February 12, 2014 by Kayla*

**Physics**

A 18 g bullet is fired into the bob of a ballistic pendulum of mass 1.4 kg. When the bob is at its maximum height, the strings make an angle of 60° with the vertical. The length of the pendulum is 2.3 m. Find the speed of the bullet.
*November 9, 2014 by Anonymous*

**Physics**

A 14 g bullet is fired into the bob of a ballistic pendulum of mass 1.6 kg. When the bob is at its maximum height, the strings make an angle of 60° with the vertical. The length of the pendulum is 2.3 m. Find the speed of the bullet. ?m/s
*July 20, 2015 by Anonymous*

**Physics**

Two teams of nine members each engage in a tug of war. The first team's members have average masses of 67 kg and exert average forces of 1350 N horizontally. The second team's members have average masses of 72 kg and exert average forces of 1361 N horizontally. (a) What is the...
*June 14, 2014 by Michelle*

**Chemistry**

In chemistry, we did a lab in which we had a certain mass of copper, performed multiple experiments on the copper, and at the end, extracted the copper from a solution and weighed it. The goal was that the mass of the final copper should be the same as the mass of the initial ...
*October 5, 2014 by melbell*

**physics**

an aeroplane touches down on the landing strip at an airpot.Assume that the speed at which the plane touches down is 100m.s and that the maximum length of the runway is 1000m.calculate the average acceleration that the plane must stop within the length of the runway
*October 23, 2010 by bolt*

**physics**

an aeroplane touches down on the landing strip at an airpot.Assume that the speed at which the plane touches down is 100m.s and that the maximum length of the runway is 1000m.calculate the average acceleration that the plane must stop within the length of the runway
*October 23, 2010 by bolt*

**PHYSICS**

QUIZ 1 AND 2, PROBLEM 3 A block of mass M is pulled with a rope that exerts a force of a magnitude F, causing it to slide over horizontal ground with kinetic coefficient of friction μ (use "mu" when you input your answer). The force is applied at angle θ (use "theta...
*June 29, 2013 by XYZ*

**Calculus. please helppp!!**

1) Two cars travel in the same direction along a straight road. The figure below shows the velocity, V, of each car at time t. Car B starts 3 hours after car A and car B reaches a maximum velocity of 40 km/hr. a. For approximately how long does each car travel? Car A: ...
*March 13, 2012 by JJ*

**Physics**

A heavy concrete panel is being lifted into position in a building by means of a crane (see figure below). The tension of 2.52 104 N in the supporting cable produces a torque with respect to point O. (Let L = 41.0 m.) (a) Does this torque tend to rotate the panel clockwise or ...
*July 25, 2012 by Velma*

**phy**

1 What is the gravitational field strength at a height h above the surface of the Earth? R is the radius of the earth gR2(R+h)2 gR(R+h) Rg(R−h) R2g(R−h)2 2 The instrument used for experimental determination of the value of the universal gravitational constant G is ...
*January 28, 2013 by christ*

**physics**

1 What is the gravitational field strength at a height h above the surface of the Earth? R is the radius of the earth gR2(R+h)2 gR(R+h) Rg(R−h) R2g(R−h)2 2 The instrument used for experimental determination of the value of the universal gravitational constant G is ...
*February 12, 2014 by nandeve*

**Physics**

A rock of mass 0.086 kg is thrown upward with an initial speed of 13 m/s. Find the work done by gravity on the rock from the time it leaves the thrower's hand until it reaches the highest point on its trajectory. Hint: You do not have to calculate the rock's maximum height.
*July 11, 2012 by Sierra*

**Physics**

A block of mass 3 kg is at rest on an incline. The coefficient of state friction between the block and incline is 0.34. What is the maximum angle of the incline such that the block will not slide down the plane?
*February 17, 2013 by Amy*

**Physics**

A 4610 kg helicopter accelerated upwards at 2 m/s^2. What lift force is exerted by the air on the propellers? I was given this reply: The air force on the prop blades is what accelerates the helicopter upward. Use good old Newton's second law: F = M a Concern: When I mulplied ...
*December 15, 2007 by Einstein*

**Physics**

You toss a tennis ball straight upward. At the moment it leaves your hand it is at a height of 1.5 m above the ground, and it is moving at a speed of 8.0 m/s. (a) How much time does it take for the tennis ball to reach its maximum height? (b) What is the maximum height above ...
*September 6, 2014 by John*

**PHYSICS**

Particles 1 and 2, each of mass m, are attached to the ends of a rigid massless rod of length L1 + L2, with L1 = 19 cm and L2 = 75 cm. The rod is held horizontally on the fulcrum and then released. What is the magnitude of the initial acceleration of particle 1? What is the ...
*March 24, 2007 by Calvin*

**Algebra 1**

The minimum recommended width of the space between 6-inch by 6-inch tiles is 2^-2 inch and the maximum recommended width is 2^-1 inch. Simplify the expressions for the minimum and maximum widths of the space between the 6-inch by 6-inch ﬂoor tiles. I got 1/3 inch is is ...
*December 9, 2013 by Aaron*

**physics**

a 1.2 kg cart slides eastward down a frictionless ramp from a height of 1.8 m and then onto a horizontal surface where it has a head-on elastic collision with a stationary 2.0 kg cart cushioned by an ideal Hooke's law spring. the maximum compression of the spring during the ...
*November 18, 2013 by LENA*

**Math-Help**

A manufacturer has determined that pro t P (in dollars) is a quadratic function of dollars per month a spent on advertising. The relationship is given by p=1+50a-0.1a^2 if a is at most 500 dollars per month -How much should be spent on advertising if pro t is to be a maximum...
*April 28, 2014 by Kevin*

**geometry**

On a rectangular piece of cardboard with perimeter 11 inches, three parallel and equally spaced creases are made. The cardboard is then folded along the creases to make a rectangular box with open ends. Letting x represent the distance (in inches) between the creases, use a ...
*January 21, 2011 by Valerie Pacetti*

**physics**

A skydiver of mass 81.5 kg jumps from a slow-moving aircraft and reaches a terminal speed of 54.9 m/s. (a) What is her acceleration when her speed is 30.0 m/s? (b) What is the drag force on the skydiver when her speed is 54.9 m/s? (c) What is the drag force on the skydiver ...
*October 25, 2011 by Anonymous*

**Science**

a body of mass 5 kg is thrown vertically upwards with a speed of 10m/s what is its k.e. when it is thrown find its potential energy when it reaches at highest poiint also find maximum height attained by the body?
*February 25, 2012 by Sharma*

**Chemistry**

Strong sunshine bombards the earth with about 1 kJ.m-2.s-1 Calculate the maximum mass of pure ethanol that can be vaporized in 10. min from a beaker left in strong sunshine, assuming the surface area of the ethanol to be 50.cm 2 .
*August 15, 2012 by Jim*

**Science**

An elastic cord of elastic constant k and length L is hung from point A having a massless block at the other end. A smooth ring of mass M falls from point A. What is the maximum elongation of cord?
*February 16, 2015 by sam*

**physics**

A small plane starts down the runway with acceleration 7.4 .if the force provided by its engine is 1.5×104 , what is the plane's mass?
*June 25, 2011 by Anonymous*

**physics**

A force of 2 kg weight acts on a body of mass 4.9 kg .Find the acceleration produced.How far will a body move in 2 seconds
*February 23, 2012 by anurag*

**physics**

A force of a 2 kg weight acts on a body of mass 4.9 kg .Find the acceleration produced.How far will the body move in 2 seconds ?
*February 23, 2012 by Anurag*

**Science**

A man with a mass of 100 kg slides down a vertical pole with an acceleration of 8 m/s2. What is the frictional force acting on the man?
*September 11, 2012 by Shannel*

**physics**

Suppose that a sled is accelerating at a rate of 2 m/s2. If the net force is tripled and the mass is doubled, then what is the new acceleration of the sled?
*December 3, 2012 by Chelsey Achord*

**physics**

a car of mass 2000kg has a driving force of 4500N and experiences an air resistance of 1500N, What is the car's acceleration??
*June 24, 2013 by ashley*

**physics**

A rocket of mass 100,000 kg undergoes an acceleration of 2 m/s2. Show that the net force acting on it is 200,000 N.
*May 17, 2014 by Peg*

**physics**

The net external force on a cart is N north. If the cart has a total mass of 220 kg, What are the magnitude and direction of its acceleration?
*July 9, 2014 by Dulce*

**Science**

Make a spreadsheet to display how the total mass of a 500-kg elevator changes as 50-kg passengers are added one at a time.
*October 14, 2012 by Shelbi*

**Physics**

The power output of an elevator is 15000 W. How many persons could it carry if it raises passenger to a height of 35 m in 20 s ( each person has an average mass of 60 kg)?
*October 20, 2014 by HiHello*

**physics**

please check these: Which interaction of nature binds atoms and molecules by attracting unlike charges and repulsing like charges? a. strong b. weak c. electromagnetic d. gravitational i got A, but someone said C , so i just want to make sure How is a motor's mechanical energy...
*March 14, 2009 by physics*

**physics**

The figure below shows an initially stationary block of mass m on a floor. A force of magnitude F = 0.570·mg is then applied at upward angle č = 22°. (a) What is the magnitude of the acceleration of the block across the floor if (a) ěs = 0.600 and ěk = 0.500? (b) What is the ...
*November 18, 2010 by Will*

**Physics**

Two blocks, (Mass of block 1 = 2.3kg, Mass of block 2 = 1.2kg), are in contact on a frictionless table. If a horizontal force of 3.2N is applied to the larger block, what is the acceleration of the smaller block. Describe all external forces that are acting on the two blocks
*November 25, 2012 by Tim*

**Physics**

Two blocks, (Mass of block 1 = 2.3kg, Mass of block 2 = 1.2kg), are in contact on a frictionless table. If a horizontal force of 3.2N is applied to the larger block, what is the acceleration of the smaller block. Describe all external forces that are acting on the two blocks
*November 25, 2012 by Tim*

**Math**

A company’s profit is described by the equation P(x) = – 5x^2 + 300x + 15,000 where x is the price in dollars that the company charges for its product. What should the company charge for the product to generate the maximum profit? a.) $20 b.) $30 c.) $50 d.) $60 How to solve? ...
*February 4, 2014 by Anonymous*

**physics**

Consider a rock that is thrown off a bridge of height 27 m at an angle θ = 24° with respect to the horizontal as shown in the figure above. If the initial speed the rock is thrown is 12 m/s, find the following quantities: (a) The time it takes the rock to reach its ...
*September 6, 2010 by frank*

**math**

A colony of bacteria is growing in a petri dish which has a maximum capacity of 100mg. The mass of bacteria is increasing at a rate given by the logistic equation. Initially there is 2mg of bacteria and the rate of increase is 1mg per day.
*February 21, 2014 by Sam*

**Math**

The profit in dollars in producing x- items of some commodity is given by the equation P = - 37 x^2 + 1073 x - 7548 . How many items should be produced to break even? (If there are two break-even points, then enter the smaller value of x. Your solution may not be an integer. ...
*September 16, 2014 by Irina*

**Physics**

A toy dart gun has a spring with a spring constant of 315 N/m. An 12 gram dart is loaded in the gun and the spring is compressed a distance of 7.8 cm and then shot into the air. When the dart is 5.8 meters high in the air, what is its speed? If the maximum height the dart can ...
*March 31, 2014 by Jon*

**Physics**

An apparatus of the figure below is designed to study insects at an acceleration of magnitude 940 m/s2 (= 96g). The apparatus consists of a 2.0-m rod with insect containers at either end. The rod rotates about an axis perpendicular to the rod and at its center. (a) How fast ...
*March 2, 2010 by Max*

**Math check my answer **

During exercise, the recommended maximum heart rate in beats per minute is modeled by the formula M = 176 – 0.8A, where M is the maximum heart rate and A is the person’s age. Approximately, at what age would you have a recommended heart rate in beats per minute of 125? (1 ...
*March 13, 2015 by SmartyPants*

**science**

Two bricks having a 22N force applied on them and each brick having a friction of 1N ,the first brick with the mass of 2kg and the second one having a mass of 3kg.calculate the acceleration that the first brick expiriences
*February 29, 2012 by Bongani*

**chemistry**

A solution of HClO4 was standardized by dissolving 0.4125 g of primary standard grade HgO ina solution of KBR: HgO (s) + 4Br- + H2O → HgBr4 + 2OH- The liberated OH- consumed 46.51 mL of the acid. calculate the molarity of the HClO4
*August 27, 2014 by nthabi*

**physics**

note ... find acceleration by using distance and time (ignore ”incline” ... just treat it like linear motion of object starting from rest). A 1.8 kg mass starts from rest and slides down an inclined plane 8.8×10−1 m long in 0.54 s. What net force is acting on the mass ...
*November 20, 2014 by Anonymous*

**physics**

A helium balloon has a mass of 0.022 kg, which includes both the helium and the balloon itself. On this balloon, there is 0.290 N of buoyant force pushing the balloon upward. If I let go of the balloon, find the balloon's acceleration rate in the upward direction. If we ...
*May 12, 2013 by Nick*

**Physics**

Can someone walk me through how to work this? It's worded weirdly and I'm not sure how to solve it. Mass M1= 2.2 kg lies on a frictionless table, pulled by another mass M2= 4.1 kg under the in of Earth's gravity. a) What is in N the net force acting on the system of both ...
*March 3, 2015 by James*

**AP physics c**

A helicopter lifts a 63 kg astronaut 10 m vertically from the ocean by means of a cable. The acceleration of the astronaut is g/10. (a) How much work is done on the astronaut by the force from the helicopter? Incorrect: Your answer is incorrect. J (b) How much work is done on ...
*October 10, 2013 by please help*

**Child Psychology **

why do fine motor skills develop slower than gross motor skills?
*April 6, 2014 by Chanel*

**! P H Y S I C S !**

A 5 kg mass is thrown down with a velocity of 10 m/s from a height of 20 m onto an upright spring with a relaxed length of 10 m, and a constant of 50 N/m. What will the maximum compression of the spring be? What will the speed of the object be when the spring is compressed 0.2...
*November 2, 2008 by Physics Guy*

**Biomechanics**

Shoulder abduction = 15ˇă Abduction acceleration = 50/rad/s/s Abduction velocity = 20 rad/s Radius of gyration and COM location from joint = 25cm Mass of hand + Arm = 8 kg Force of middle deltoid =400N Middle deltoid only active muscle Force of theraband = 70N Middle deltoid ...
*March 29, 2015 by Ming*

**Earth Science**

What is the relative humidity of sample 2: Sample: 2 T(degrees)C: 32(degrees) Mass of Water Vapor: 14 g Mass of Water vapor at Saturation: 34 g please help me...i dont understand how to find this The relative humidity in this case is 14/34 = 41% It is always the ratio of the ...
*February 27, 2007 by Nikki-Ole*

**physics**

A mass of 710 kg is located at the origin. A second mass, 44.0 kg, is located at the point (0.216,0.702) m. Find the magnitude of the gravitational force on the 44.0 kg mass due to the 710 kg mass at the origin. I got: 3.86×10-6 N Enter the x and y components of the ...
*April 28, 2012 by Marc*

**physics**

A system of pulleys is used to lift an elevator carrying a 3,300 newton load. assuming the pulley system is friction free, approximately how far would 10,000 joules of energy lift the elevator?
*February 22, 2011 by tania*

**Physics**

Roller Coaster Cart Mass = 200kg String Compressed by 5m Initial Velocity 25 m/s PE = 2,500 J KE = 62,500 J Use the law of conservation of mechanical energy to find the maximum radius the loop can have before the cart falls off
*October 17, 2012 by Scoop*

**Physics**

A little red wagon with mass 7.0kg moves in a straight line on a frictionless horizontal surface. It has an initial speed of4.00 m/s and then is pushed 3.0m in the direction of the initial velocity by a force with a magnitude of 10.0 N a.) Use the work-energy theorem to ...
*October 15, 2012 by Frankie*

**Physics**

A little red wagon with mass 7.0kg moves in a straight line on a frictionless horizontal surface. It has an initial speed of4.00 m/s and then is pushed 3.0m in the direction of the initial velocity by a force with a magnitude of 10.0 N a.) Use the work-energy theorem to ...
*October 15, 2012 by Frankie*

**physics**

An arrangement of two pulleys, as shown in the figure, is used to lift a 49.6-kg mass a distance of 3.70 m above the starting point. Assume the pulleys and rope are ideal and that all rope sections are essentially vertical. (a) What is the mechanical advantage of this system...
*June 11, 2012 by Akbar*

**Physics**

An arrangement of two pulleys, as shown in the figure, is used to lift a 49.6-kg mass a distance of 3.70 m above the starting point. Assume the pulleys and rope are ideal and that all rope sections are essentially vertical. (a) What is the mechanical advantage of this system...
*June 11, 2012 by Akbar*

**physics**

An arrangement of two pulleys, as shown in the figure, is used to lift a 49.6-kg mass a distance of 3.70 m above the starting point. Assume the pulleys and rope are ideal and that all rope sections are essentially vertical. (a) What is the mechanical advantage of this system...
*June 13, 2012 by Akbar *

**Physics**

The above spring has a spring constant of 29 N/m. The μ between the box and the surface is 0.3. The box has a mass of 1 kg. What is the maximum distance that the spring can be stretched from equilibrium before the box begins to slide back?
*February 12, 2014 by Help*

**physics**

What is the acceleration of two falling sky divers (mass 107.0 kg including parachute) when the upward force of air resistance is equal to one-fourth of their weight?
*March 8, 2011 by Anonymous*

**physics**

A resultant force of 25 Newton acts on mass of 0.5 kg standing from rest. find: a) the acceleration in m/s square b) the final velocity after 20 seconds c) the distance moved in meter
*March 21, 2011 by chocolate*

**physics**

A .5kg ball on the end of a string is revolving uniformly in ahorizontal circle of radius 1m. The ball makes 2 revolustion in a second. a) determine the linear (tangential) speed of the ball. For this part of the question would I do this: v=d/t =1m/.5s =2m/s b)determine the ...
*October 31, 2007 by Tammy*

**physics**

In a rescue, the 64.0 kg police officer is suspended by two cables,the cable on the left made a 35 degree angle, the rope on the right made a 48 degree angle. What is the tension in the left cable? Find the tension in the right cable.
*February 27, 2008 by Erin*

**Physics**

A carefully designed experiment can measure the gravitational force between masses of 6 kg. Given that the density of iron is 7860 kg/m3, what is the gravitational force between two 6.00-kg iron spheres that are touching? The answer is 1.87e-07 N. How do I get this answer?
*June 27, 2012 by Amy*

**geometry**

You need to lay communications cable around the perimeter of three offices, each 8' by 10'. How much cable do you need?
*July 9, 2012 by Patty S*

**Math**

You need to lay communications cable around the perimeter of three offices, each 8' by 10'. How much cable do you need?
*July 10, 2012 by Guy*

**Physics**

A model rocket launches with an initial velocity of 6 m/s, at an angle of 90 degrees (with respect to the horizon). The rocket's engine provides an acceleration of 2.2 m/s2, acting in the same direction as the initial velocity. After 20 seconds, the rocket engine cuts out. ...
*February 15, 2013 by Dee*

**physics**

a 2390 kg car traveling to the west at 22.4 m/s slows down uniformly under a force of 8740 N to the east. (a) How much force would be required to cause the same acceleration on a car of mass 3140 kg? Answer in units N (b) How far would the car move before stopping? Answer in ...
*February 9, 2009 by Bob*

**Physic**

How does doubling the mass of one object and tripling the distance between another object change the gravitational force betweem them? FG = G M1 M2 / r2 a. Force changes by 2/3 b. Force changes by 2/9 c. Force increases by 9 d. Force decreases by 3 e. No change in force
*February 2, 2011 by Help*

**Physics**

Monochromatic x-rays (λ = 0.166 nm) from a nickel target are incident on a potassium chloride (KCl) crystal surface. The spacing between planes of atoms in KCl is 0.314 nm. At what angle (relative to the surface) should the beam be directed for a second-order maximum to ...
*March 17, 2013 by Ken*

**Science**

At the distance of the earth from the sun the pressure exerted by sunlight is avout 10^-5 Pa How much force does this pressure exerted on 10m^2 array of solar cells on a satellite when the array is perpendicular to the direction of the sunlight? If the satellite has a mass of ...
*January 2, 2010 by Angel*

**Physics**

At the distance of the earth from the sun the pressure exerted by sunlight is avout 10^-5 Pa How much force does this pressure exerted on 10m^2 array of solar cells on a satellite when the array is perpendicular to the direction of the sunlight? If the satellite has a mass of ...
*January 2, 2010 by Angel*

**mechanics: simple harmonic oscillation**

Consider an ideal spring that has an unstretched length ℓ and a spring constant k. Suppose the spring is attached to a mass m that lies on a horizontal frictionless surface. The spring-mass system is compressed a distance of x_0 from equilibrium and then released with an...
*September 3, 2015 by student1618*

**physic**

Three 30mm diameter cables support the car in a cable elevator. Inside the car is a safety notice. SAFE WORKING LOAD 33 PERSONS 2244 KG The yield stress of the cables is 200MPa. What factor of safety has been applied at the safe working load? Factor of safety=??????????????
*April 2, 2013 by alax*

**Physics**

1. The problem statement, all variables and given/known data A student pulls on a box up an incline of 10 degrees. The student pulls with a force of 180 N directed at 30 degrees above the line of the incline. The box has a mass of 28 kg, and the coefficient of friction between...
*October 7, 2007 by Tim*

**Science--Physics--check answers**

1. A football player pushes a dummy forwards at a constant 0.85m/s for 11m using 7150 J of energy. The dummy has a mass of 120 kg. Find the force the football player exerts, find the frictional force the dummy exerts. - for my answer I got 1176N as the force the football ...
*February 3, 2014 by Diane*

**Physics**

A 14 g bullet is fired into the bob of a ballistic pendulum of mass 1.6 kg. When the bob is at its maximum height, the strings make an angle of 60° with the vertical. The length of the pendulum is 2.3 m. Find the speed of the bullet. ?m/s Any help is greatly appreciated. Thanks!
*July 21, 2015 by Raj*

**College Algebra**

On a rectangular piece of cardboard with perimeter 11 inches, three parallel and equally spaced creases are made. The cardboard is then folded along the creases to make a rectangular box with open ends. Letting x represent the distance (in inches) between the creases, use a ...
*January 21, 2011 by Valerie Pacetti*

**Physics**

As a baseball is being caught, it's speed goes from 30.0m/s to 0m/s in about 0.0050s. The mass of the baseball is 0.145kg A) what is the baseballs acceleration B) what are the magnitude and direction of the force acting on it? C) what is the magnitude and direction of the ...
*January 23, 2014 by Sandara*

**Physics**

super mouse steals a large piece of cheese by rolling it across the floor with a force of 5.0 N. If the cheese has a mass of 50 kg with what acceleration does the cheese move? If super mouse's force remains constant, what will be the speed of the rolling cheese
*December 5, 2014 by Jennifer*

**math**

open top rectangular box made from 35 x 35 inch piece of sheet metal by cutting out equal size squares from the corners and folding up the sides. what size squares should be removed to produce box with maximum volume.
*October 10, 2011 by Sejul*