Monday

April 27, 2015

April 27, 2015

Number of results: 31,653

**ap physics**

A skier of mass 70.5 kg is pulled up a slope by a motor-driven cable. How much work is required to pull the skier 60 m up a 38° slope (assumed to be frictionless) at a constant speed of 2.0 m/s?
*March 14, 2010 by shanster*

**physics**

A skier of mass 75.0 kg is pulled up a slope by a motor-driven cable. How much work is required to pull the skier 60.0 m up a 35° slope (assumed to be frictionless) at a constant speed of 2.0 m/s?
*October 19, 2010 by ed*

**physics**

A skier of mass 65.0 kg is pulled up a slope by a motor-driven cable. How much work is required to pull the skier 57.0 m up a 35° slope (assumed to be frictionless) at a constant speed of 2.0 m/s? J
*January 5, 2011 by Anonymous*

**Physics**

A skier of mass 73.5 kg is pulled up a slope by a motor-driven cable. How much work is required to pull the skier 58 m up a 32° slope (assumed to be frictionless) at a constant speed of 2.0 m/s?
*April 11, 2011 by Elizabeth*

**Physics**

A skier of mass 74.5 kg is pulled up a slope by a motor-driven cable. How much work is required to pull the skier 55 m up a 31° slope (assumed to be frictionless) at a constant speed of 2.0 m/s?
*October 14, 2012 by Angela*

**Physics**

A skier of mass 67.0 kg is pulled up a slope by a motor-driven cable. How much work is required to pull the skier 59 m up a 32° slope (assumed to be frictionless) at a constant speed of 2.0 m/s?
*November 20, 2014 by Ben*

**Physics**

A skier of mass 71.0 kg is pulled up a slope by a motor-driven cable. How much work is required to pull the skier 62.2 m up a 37.0 slope (assumed to be fric- tionless) at a constant speed of 2.0 m/s? The acceleration of gravity is 9.81 m/s2 .
*January 9, 2012 by Aly*

**physics**

A skier of mass 74.6 kg is pulled up a slope by a motor-driven cable. How much work is required to pull the skier 63.3 m up a 39.0◦ slope (assumed to be frictionless) at a constant speed of 2.0 m/s? The acceleration of gravity is 9.81 m/s 2 . Answer in units of J
*January 29, 2015 by paula*

**physics**

A skier of mass 72 kg is pulled up a slope by a motor-driven cable. (a) How much work is required to pull him 65 m up a 30° slope (assumed frictionless) at a constant speed of 2.7 m/s? (b) What power must a motor have to perform this task?
*March 20, 2011 by Allie*

**physics**

A skier of mass 74 kg is pulled up a slope by a motor-driven cable. (a) How much work is required to pull him 90 m up a 30° slope (assumed frictionless) at a constant speed of 3.0 m/s? J (b) What power (expressed in hp) must a motor have to perform this task? hp
*October 12, 2012 by monic*

**Physics**

skier of mass 79 kg is pulled up a slope by a motor-driven cable. (a) How much work is required to pull him 80 m up a 30° slope (assumed frictionless) at a constant speed of 3.4 m/s? 1 J (b) What power (expressed in hp) must a motor have to perform this task?
*February 26, 2014 by Muriel*

**Physics**

A skier of mass 70 kg is pulled up a slope by a motor-driven cable. (a) How much work is required to pull him 60m up a 30 degree slope (assumed frictionless) at a constant speed of 2.0 m/s? (b) What power must a motor have to perform this task?
*October 7, 2007 by Kelly*

**Physics**

A skier of mass 76 kg is pulled up a slope by a motor-driven cable. (a) How much work is required to pull him 40 m up a 30° slope (assumed frictionless) at a constant speed of 2.5 m/s? J I know that the answer to the first problem is 14896Joules, but I do not know how to ...
*March 10, 2010 by Kelsey*

**Physics. PLEASE HELP!!**

A skier of mass 71 kg is pulled up a slope by a motor-driven cable. The acceleration of gravity is 9.8 m/s2. How much work is required to pull him 64.6 m up a 33.8 slope (assumed to be frictionless) at a constant speed of 2.53 m/s? Answer in units of kJ
*March 26, 2012 by Ashley*

**Physics**

A 85-kg snow skier is being pulled up a 17 ° slope by a steel (Young's modulus 2.0 x 1011 N/m2) cable. The cable has a cross-section area of 7.4 x 10-5 m2. The cable applies a force to the skier, and, in doing so, the cable stretches by 2.6 x 10-4 m. A frictional force of ...
*March 27, 2013 by Anon*

**Physics**

A 61-kg snow skier is being pulled up a 14 ° slope by a steel (Young's modulus 2.0 x 1011 N/m2) cable. The cable has a cross-section area of 7.0 x 10-5 m2. The cable applies a force to the skier, and, in doing so, the cable stretches by 2.1 x 10-4 m. A frictional force of ...
*November 23, 2013 by Samantha*

**physics**

A skier of mass 70kg is pulled up a slope by a motor-driven cable. The acceleration of gravity is 9.8m/s^2. How much work is required to pull him 60m up a 30.7º slope (frictionless) at a constant speed of 3 m/s? answer in units of kJ. In this question, I think I gotta use mgh ...
*September 17, 2006 by puff puff*

**Physics**

A skier is pulled up a slope at a constant velocity by a tow bar. The slope is inclined at 24.0° with respect to the horizontal. The force applied to the skier by the tow bar is parallel to the slope. The skier's mass is 60.0 kg, and the coefficient of kinetic friction between...
*February 3, 2011 by Lauren*

**physics**

A skier is pulled up a slope at a constant velocity by a tow bar. The slope is inclined at 25.9° with respect to the horizontal. The force applied to the skier by the tow bar is parallel to the slope. The skier's mass is 55.3 kg, and the coefficient of kinetic friction between...
*January 28, 2012 by rachel *

**physics **

A skier is pulled up a slope at a constant velocity by a tow bar. The slope is inclined at 25.9° with respect to the horizontal. The force applied to the skier by the tow bar is parallel to the slope. The skier's mass is 55.3 kg, and the coefficient of kinetic friction between...
*January 30, 2012 by Amanda *

**physics**

A skier is pulled up a slope at a constant velocity by a tow bar. The slope is inclined at 25.9° with respect to the horizontal. The force applied to the skier by the tow bar is parallel to the slope. The skier's mass is 55.3 kg, and the coefficient of kinetic friction between...
*January 30, 2012 by Marlee *

**physics**

A skier is pulled up a slope at a constant velocity by a tow bar. The slope is inclined at 22.2° with respect to the horizontal. The force applied to the skier by the tow bar is parallel to the slope. The skier's mass is 56.0 kg, and the coefficient of kinetic friction between...
*September 28, 2012 by shyne*

**College Physics**

A skier is pulled up a slope at a constant velocity by a tow bar. The slope is inclined at 28.2 ° with respect to the horizontal. The force applied to the skier by the tow bar is parallel to the slope. The skier's mass is 46.7 kg, and the coefficient of kinetic friction ...
*March 15, 2012 by Angela*

**Physics**

A skier is pulled up a slope at a constant velocity by a tow bar. The slope is inclined at 27.2 ° with respect to the horizontal. The force applied to the skier by the tow bar is parallel to the slope. The skier's mass is 53.7 kg, and the coefficient of kinetic friction ...
*February 19, 2007 by Susu*

**DrBob222 physics**

A skier is pulled up a slope at a constant velocity by a tow bar. The slope is inclined at 27.2 ° with respect to the horizontal. The force applied to the skier by the tow bar is parallel to the slope. The skier's mass is 53.7 kg, and the coefficient of kinetic friction ...
*February 19, 2007 by Susu*

**Calculus**

An electric elevator cable with a motor at the top has a multistrand cable weighing 4.5lb/ft. When the car is at the first floor, 180ft of cable are pulled out, and effectively 0ft are out when the car is at the top floor. How much work does the motor do just lifting the cable...
*May 2, 2014 by Mason*

**physics**

A 35-kg skier skis directly down a frictionless slope angled at 11° to the horizontal. Assume the skier moves in the negative direction of an x axis along the slope. A wind force with component Fx acts on the skier. What is Fx (in N) if the magnitude of the skier's velocity is...
*February 8, 2007 by **chocolatekisses*

**physics**

A skier is pulled by a tow rope up a frictionless ski slope that makes an angle of 12 degrees with the horizontal. The rope moves parallel to the slope with a constant speed of 1.0 m/s. The force of the rope does 880 J of work on the skier as the skier moves a distance of 7.0 ...
*November 15, 2011 by Anonymous*

**physics**

A certain elevator car has mass 2200 kg and is lifted by cables driven by an electric motor. The efficiency of the lift system (motor, pulleys, cable, etc.) is 67.0%. As the elevator car moves at constant speed of 3.0 m/s it encounters 220N of friction coming from its tracks. ...
*December 1, 2013 by Bob*

**physics**

A skier of mass 54.6 kg comes down a slope of constant angle 21◦ with the horizontal. The acceleration of gravity is 9.8 m/s2 . What is the force on the skier parallel to the slope? Answer in units of N
*January 10, 2012 by Connor*

**physics**

A skier of mass 54.6 kg comes down a slope of constant angle 21◦ with the horizontal. The acceleration of gravity is 9.8 m/s2 . What is the force on the skier parallel to the slope? Answer in units of N
*January 10, 2012 by Connor*

**physics**

A skier of mass 54.6 kg comes down a slope of constant angle 21◦ with the horizontal. The acceleration of gravity is 9.8 m/s2 . What is the force on the skier parallel to the slope? Answer in units of N
*January 10, 2012 by Connor*

**physics**

A skier of mass 40.6 kg comes down a slope of constant angle 30◦ with the horizontal. What is the force on the skier parallel to the slope? Neglect friction. The acceleration of gravity is 9.8 m/s 2
*October 16, 2013 by ZAIMAH*

**physics**

A 48 kg skier skis directly down a frictionless slope angled at 5° to the horizontal. Assume the skier moves in the negative direction of an x axis along the slope. A wind force with component Fx acts on the skier. (a) What is Fx if the magnitude of the skier's velocity is ...
*September 22, 2010 by John*

**physics**

A skier with a mass of 70 kg starts from rest and skis down an icy (frictionless) slope that has a length of 52 m at an angle of 32° with respect to the horizontal. At the bottom of the slope, the path levels out and becomes horizontal, the snow becomes less icy, and the skier...
*March 3, 2010 by Larry*

**Science**

A skier of mass 75 kg accelerates from rest down the slope as shown in the diagram (It's a triangle with a height of 300 m, length of 400 m, and the hypotenuse is 500 m; The skier is on the hypotenuse. At the bottom of the slope, he is travelling at 40 m/s. What is the average...
*December 17, 2012 by John*

**Physics**

A skier with a mass of 56 kg starts from rest and skis down an icy (frictionless) slope that has a length of 70 m at an angle of 32° with respect to the horizontal. At the bottom of the slope, the path levels out and becomes horizontal, the snow becomes less icy, and the skier...
*February 16, 2012 by Michelle*

**college level physics**

a 40 kg skier skis down a frictionless slope angled at 10 degrees to the horizontal. Assume the skier moves in the negative direction of an x axis along the slope. A wind force with component Fx acts on the skier. What is Fx is the magnitude of the skier's velocity is (a) ...
*October 19, 2008 by jane*

**Physics**

A skier of mass 59.5 kg comes down a slope of constant angle 1◦ with the horizontal. The acceleration of gravity is 9.8 m/s^2 i. What is the force on the skier parallel to the slope? Answer in units of N. ii. What force normal to the slope is exerted by the skis? Answer ...
*February 21, 2014 by mallak*

**Physics**

A ski slope drops at an angle of 24 degrees with respect to the horizontal and is 500 m long. A 60 kg skier skis down from the top to the bottom of the slope. A.) Determine the change in gravitational potential energy of the skier+earth system. b.) If 20% of the gravitation ...
*November 12, 2012 by Iza*

**physics**

A ski slope drops at an angle of 24 degrees with respect to the horizontal and is 500 m long. A 60 kg skier skis down from the top to the bottom of the slope. A.) Determine the change in gravitational potential energy of the skier+earth system. b.) If 20% of the gravitation ...
*July 14, 2014 by bibs*

**physics**

A motor drives a rope drum of 820 mm diameter, which in turn drags a component of mass 650 kg, 175 m up a slope that makes an angle of 8 degrees to the horizontal. the component starts from rest and uniformly reaches a velocity of 5.3 m/s on completion of its journey. use d'...
*June 7, 2012 by James*

**college physics**

a water skier is being pulled by a tow rope attached to a boat. as the driver pushes the throttle forward,the skier accelerates. a 70.3kg water skier has an initial speed of 6.10m\s. determine the work done by the net external force acting on the skier.
*May 6, 2013 by jaret*

**Physics**

A skier of weight 700N is pulled at constant speed up a smooth slope, of inclination 15 degrees, by a force of magnitude P N acting at 25 degrees upwards from the slope. Find the value of P.
*October 5, 2010 by Laura*

**Physics**

A skier of weight 700N is pulled at constant speed up a smooth slope, of inclination 15 degrees, by a force of magnitude P N acting at 25 degrees upwards from the slope. Find the value of P.
*October 5, 2010 by Laura*

**Physics**

A water-skier is being pulled by a tow rope attached to a boat. As the driver pushes the throttle forward, the skier accelerates. A 73.0-kg water-skier has an initial speed of 7.1 m/s. Later, the speed increases to 10.9 m/s. Determine the work done by the net external force ...
*February 27, 2012 by Candy*

**physics**

A water-skier is being pulled by a tow rope attached to a boat. As the driver pushes the throttle forward, the skier accelerates. A 65.6-kg water-skier has an initial speed of 5.2 m/s. Later, the speed increases to 11.9 m/s. Determine the work done by the net external force ...
*October 2, 2014 by alika*

**science**

A 50 kg skier is pulled up a frictionless ski slope that makes an angle of 8 degrees with the horizontal by holding onto a tow rope that moves parallel to the slope. Determine the magnitude of the force of the rope on the skier at an instant when a) the rope is moving with a ...
*November 12, 2006 by Ren*

**physics**

A skier coasts down a very smooth 10-m high slope. if the speed of the skier on the slope is 5.0-m/s what is his speed at the bottom of the slope?
*January 26, 2008 by melissa*

**Physics**

A water-skier is being pulled by a tow rope attached to a boat. As the driver pushes the throttle forward, the skier accelerates. A 63.6-kg water-skier has an initial speed of 5.3 m/s. Later, the speed increases to 10.8 m/s. Determine the work done by the net external force ...
*November 8, 2011 by Gabby*

**Physics**

A skier with a mass of 66.6 kg starts from rest and skis down an icy (frictionless) slope that has a length of 58.4 m at an angle of 29.8° with respect to the horizontal. At the bottom of the slope, the path levels out and becomes horizontal, the snow becomes less icy, and the...
*September 27, 2012 by Rebecca*

**physics**

An elevator (mass 4125 kg) is to be designed so that the maximum acceleration is 0.0400g. What is the maximum force the motor should exert on the supporting cable? What is the minimum force the motor should exert on the supporting cable?
*October 8, 2009 by DJ*

**Ap Physics**

An elevator (mass 4025 kg) is to be designed so that the maximum acceleration is 0.0700g. What is the maximum force the motor should exert on the supporting cable?(N) What is the minimum force the motor should exert on the supporting cable?(N)
*September 10, 2010 by rayray*

**Physics help!**

An elevator (mass 4125 kg) is to be designed so that the maximum acceleration is 0.0300g. What is the maximum force the motor should exert on the supporting cable? What is the minimum force the motor should exert on the supporting cable?
*September 26, 2011 by Bridge*

**Physics**

An elevator (mass 5000 kg) is to be designed so that the maximum acceleration is 0.0620 g. What is the maximum force the motor should exert on the supporting cable? (in N) What is the minimum force the motor should exert on the supporting cable? (in N)
*February 10, 2015 by Madison*

**Physics**

A stuntman is being pulled along a rough road at a constant velocity by a cable attached to a moving truck. The cable is parallel to the ground. The mass of the stuntman is 110 kg, and the coefficient of kinetic friction between the road and him is 0.825. Find the tension in ...
*March 20, 2013 by Kelly*

**physics**

A T-bar tow is planned in a new ski area. At any one time, it will be required, to pull a maximum of 80 skiers up a 600-m slope inclined at 15 degrees above the horizontal at a speed of 2.5 m/s. The coefficient of kinetic friction between teh skiers skis and the snow is ...
*March 4, 2010 by bill*

**Physics**

An elevator (mass 4700 kg) is to be designed so that the maximum acceleration is 6.00×10^-2 g What is the maximum force the motor should exert on the supporting cable? What is the minimum force the motor should exert on the supporting cable?
*February 3, 2011 by Arthur*

**Physics**

A block of mass 17.9 kg supported by a vertical massless cable is initially at rest. The block is then pulled upward with a constant acceleration of 2.01 m/s2. What is the tension in the cable? What is the magnitude of the net force acting on the mass? What is the speed of the...
*February 13, 2013 by Jessica*

**physics 20**

DYNAMICS: a skier starts at the top of a 30m hill ta an anle of 20 degrees. the skier goes straight down the firctionless slope. How long will it take the skier to get to the bottom?
*April 6, 2011 by Ty*

**physics 20**

DYNAMICS: a skier starts at the top of a 30m hill ta an anle of 20 degrees. the skier goes straight down the firctionless slope. How long will it take the skier to get to the bottom?
*April 6, 2011 by peter*

**college physics**

A block of mass 21.5 kg supported by a vertical massless cable is initially at rest. The block is then pulled upward with a constant acceleration of 3.79 m/s2. what is the tension in the cable? what is the magnitude of the net force acting on the mass? what is the speed of the...
*June 30, 2014 by val*

**college physics**

A block of mass 21.5 kg supported by a vertical massless cable is initially at rest. The block is then pulled upward with a constant acceleration of 3.79 m/s2. what is the tension in the cable? what is the magnitude of the net force acting on the mass? what is the speed of the...
*July 1, 2014 by val*

**Physics(Please respond)**

A water-skier is being pulled by a tow rope attached to a boat. As the driver pushes the throttle forward, the skier accelerates. A 83.9-kg water-skier has an initial speed of 6.3 m/s. Later, the speed increases to 10.1 m/s. Determine the work done by the net external force ...
*June 3, 2012 by Hannah*

**Physics**

The object in the figure has a mass of 3.45 kg and is pulled up a slope AB, which is 36 m long; the height BC is 3.00 m. There is no friction and the acceleration is constant. The speed v1 at A is 3.5 m/s whereas the speed v2 at B is 5.5 m/s. The average power developed by the...
*February 22, 2014 by kjean*

**Physics**

A skier squats low and races down a 14 degree ski slope. During a 5 s interval, the skier accelerates at 4.2 m/s2. What is the horizontal component of the skier’s acceleration (perpendicular to the direction of free fall)?
*November 25, 2012 by Anonymous*

**physics**

A 40 kg skier comes directly down a frictionless ski slope that is inclined at an angle of 10 degrees with the horizontal while a strong wind blows parallel to teh slope. Determine the magnitude and diercection of the force of the wind on the skier id a) magnitude of the skier...
*November 25, 2006 by Dee*

**physics**

A skier squats low and races down an 11◦ ski slope. During a 3 s interval, the skier accelerates at 2.7 m/s^2 . What is the horizontal component of the skier’s acceleration (perpendicular to the direction of free fall)? Answer in units of m/s^2.
*October 8, 2012 by Sarah*

**Physics**

A 74 kg skier is pulled 50 meters up a 30 degree incline. How much work is required to pull the skier up?
*October 7, 2007 by Marisa*

**physics**

A 40 kg skier comes directly down a frictionless ski slope that is inclined at an angle of 10 degrees with the horizontal while a strong wind blows parallel to teh slope. Determine the magnitude and diercection of teh force of the wind on the skier id a) magnitude od the skier...
*November 21, 2006 by Bri*

**physics**

Two factors: 1) the weight of the car is now partially down the cable, it adds to tension: mgsinTheta is the component of weight pulling back on the cable. 2) going up you have mass*acceleration. Total tension: ma +mgsinTheta check my thinking, draw a diagram. A section of an ...
*November 13, 2006 by bobpursley*

**Physics**

A 50kg skier starts from rest from the top of a 100m slope. What is the speed of hte skier on reaching the bottom of the slope? Neglect friction. would i do this: =PE + KE =mgh +1/2mv^2 =50(10)(100) + 1/2 (50)v^2 =50000 +25v^2 =2000 =v^2 44.7m/s =v Is this correct? Thank in ...
*October 16, 2007 by Andrea*

**physics**

A section of an alpne cable-car system has a maximum permissible mass of each car with occupants in 2800kg. The cars riding on a support calbe ar pulled by a second cable attached to each pylon(support tower); assume the cables are straight. What is the difference in tension b...
*November 13, 2006 by Chris*

**Physics Help Please!!!!**

A man pushes a stalled car with a horizontal force of 312 N. The car does not move. What is the frictional drag force on the car? A water-skier (mass=60kg) is pulled by a boat with a horizontal force of 300N. The boat and the skier have a constant velocity. What is the ...
*October 16, 2014 by Jim*

**physics**

A 64.2-kg skier coasts up a snow-covered hill that makes an angle of 23.8° with the horizontal. The initial speed of the skier is 7.18 m/s. After coasting 1.96 m up the slope, the skier has a speed of 3.13 m/s. Calculate the work done by the kinetic frictional force that acts ...
*November 26, 2011 by dave*

**Physics**

A skier of mass 79.1 kg, starting from rest, slides down a slope at an angle q of 38 with the horizontal. The coefficient of kinetic friction, m, is 0.09. What is the net work (the net gain in kinetic energy) done on the skier in the first 8.9 s of descent?
*October 19, 2012 by Brianna*

**Physics**

An empty elevator of mass 2.7x10^2kg is pulled upward by a cable at an acceleration of 1.2m/s. What is the tension in the cable? What would the tension be if the elevator were accelerating downward at 1.2m/s^2?
*October 14, 2010 by Jill*

**physics**

A loaded ore car has a mass of 935 kg and rolls on rails with negligible friction. It starts from rest and is pulled up a mine shaft by a cable connected to a winch. The shaft is inclined at 26.0° above the horizontal. The car accelerates uniformly to a speed of 2.20 m/s in 11...
*March 2, 2009 by Jessi*

**Physics**

A 52 kg skier is at the top of a slope, as in the figure. At the initial point A, the skier is 12.4 m vertically above the final point B. The acceleration of gravity is 9.81 m/s2 .Find the difference in potential energy if the zero level is midway down the slope, at a height ...
*January 25, 2011 by Sangita*

**Physics**

A 61.8 kg skier coasts up a snow-covered hill that makes an angle of 26.0° with the horizontal. The initial speed of the skier is 6.10 m/s. After coasting a distance of 1.86 m up the slope, the speed of the skier is 4.48 m/s. Calculate the work done by the kinetic frictional ...
*April 29, 2010 by Fallon*

**Physics 1**

A 64.9 kg skier coasts up a snow-covered hill that makes an angle of 25.4° with the horizontal. The initial speed of the skier is 8.67 m/s. After coasting a distance of 1.92 m up the slope, the speed of the skier is 4.33 m/s. Calculate the work done by the kinetic frictional ...
*May 5, 2010 by Fallon*

**physics**

A 64.9 kg skier coasts up a snow-covered hill that makes an angle of 25.4° with the horizontal. The initial speed of the skier is 8.67 m/s. After coasting a distance of 1.92 m up the slope, the speed of the skier is 4.33 m/s. Calculate the work done by the kinetic frictional ...
*May 9, 2010 by Fallon*

**physics**

A 64.9 kg skier coasts up a snow-covered hill that makes an angle of 25.4° with the horizontal. The initial speed of the skier is 8.67 m/s. After coasting a distance of 1.92 m up the slope, the speed of the skier is 4.33 m/s. Calculate the work done by the kinetic frictional ...
*May 11, 2010 by Fallon*

**physics**

A skier of mass 77.7 kg, starting from rest, slides down a slope at an angle $\theta$ of 35.7° with the horizontal. The coefficient of kinetic friction is 0.08. What is the net work, i.e. net gain in kinetic energy, (in J) done on the skier in the first 10.9 s of descent?
*November 22, 2013 by JAYZ*

**physics**

A skier of mass 70.4 kg, starting from rest, slides down a slope at an angle $\theta$ of 36.8° with the horizontal. The coefficient of kinetic friction is 0.14. What is the net work, i.e. net gain in kinetic energy, (in J) done on the skier in the first 8.4 s of descent?
*November 22, 2014 by hicham*

**physics**

A skier of mass 70.4 kg, starting from rest, slides down a slope at an angle $\theta$ of 36.8° with the horizontal. The coefficient of kinetic friction is 0.14. What is the net work, i.e. net gain in kinetic energy, (in J) done on the skier in the first 8.4 s of descent?
*November 22, 2014 by hicham*

**physics**

A skier of mass 70.4 kg, starting from rest, slides down a slope at an angle $\theta$ of 36.8° with the horizontal. The coefficient of kinetic friction is 0.14. What is the net work, i.e. net gain in kinetic energy, (in J) done on the skier in the first 8.4 s of descent?
*November 22, 2014 by hicham*

**Algebra**

need help. The skier goes down the slope distance d and time t. The relationship between d and t can be represented in the following form d = at = bt^2 where a nd b are constants. If given d=11 t=2 and d=28 t=4 how to calculate values of a and b. Calculate the length of the ...
*January 2, 2013 by zhuzhu*

**Physics**

A fully loaded, slow-moving freight elevator has a cab with a total mass of 1250 kg, which is required to travel upward 58 m in 3.4 min, starting and ending at rest. The elevator's counterweight has a mass of only 1005 kg, and so the elevator motor must help. What average ...
*November 2, 2009 by Anjli*

**Physics**

fully loaded, slow-moving freight elevator has a cab with a total mass of 1250 kg, which is required to travel upward 58 m in 3.4 min, starting and ending at rest. The elevator's counterweight has a mass of only 1005 kg, and so the elevator motor must help. What average power...
*November 4, 2009 by Corey*

**PHYSICS HELPPPP**

A loaded ore car has a mass of 880 kg and rolls on rails with negligible friction. It starts from rest and is pulled up a mine shaft by a cable connected to a winch. The shaft is inclined at 28.0° above the horizontal. The car accelerates uniformly to a speed of 2.20 m/s in 11...
*December 5, 2008 by john*

**Physics**

3. An 80 kg skier is skiing down a slope (assume its frictionless) as shown in the diagram. The skier then hits a patch of sandy snow that applies a constant frictional force of 320 N directed up the slope. a. What is the skiers acceleration before hitting the sandy snow? b. ...
*January 27, 2015 by Krystal*

**Physics**

A skier of mass 66 kg skis straight down a 11° slope at constant velocity. Draw a free-body diagram of the skier with the various external forces acting on her. Include the force of air resistance, which is directed opposite the velocity. (Do this on paper. Your instructor ...
*March 16, 2013 by Help*

**physics**

A 65.0-kg skier coasts up a snow-covered hill that makes an angle of 27.4° with the horizontal. The initial speed of the skier is 6.37 m/s. After coasting 2.07 m up the slope, the skier has a speed of 4.06 m/s. Calculate the work done by the kinetic frictional force that acts ...
*November 28, 2011 by Yuli*

**Physic**

A 61-kg skier, coasting down a hill that is an angle of 23 to the horizontal, experiences a force of kinetic friction of magnitude 72N. The skier's speed is 3.5m/s near the top of the slope. Determine the speed after the skier has travelled 62m downhill. Air resistance is ...
*August 14, 2013 by Tristan*

**Physics**

An electric motor is used to pull a 125 kg box across a floor using a long cable. the tension in the cable is 350N and the box accelerates at 1.2m/s^2[forward] for 5.0s. The cable breaks and the box slows down and stops. How far does the box travel from the moment the cable ...
*October 29, 2012 by Lala*

**Physics**

An electric motor is used to pull a 125 kg box across a floor using a long cable. the tension in the cable is 350N and the box accelerates at 1.2m/s^2[forward] for 5.0s. The cable breaks and the box slows down and stops. How far does the box travel from the moment the cable ...
*October 29, 2012 by Lala*

**physics**

If the mass of the skier is 50 kg, what is the magnitude of the force of kinetic friction on the skier? Be sure to show your work, and use g = 10 m/s^2 for the magnitude of acceleration due to gravity. Sin 30degrees = 1/2 Cos 30degrees = square root 3/4 Tan 30degrees = square ...
*October 27, 2014 by rob*

**Physics**

Safety engineers estimate that an elevator can hold 20 persons of 65 kg average mass. The elevator itself has amass of 450 kg. Tensile strength tests show that the cable supporting the elevator can tolerate a maximum force of 2.94e4 N. What is the greatest acceleration that ...
*September 19, 2007 by Anonymous*

**physics**

In downhill speed skiing a skier is retarded by both the air drag force on the body and the kinetic frictional force on the skis. Suppose the slope angle is è = 37.5°, the snow is dry snow with a coefficient of kinetic friction ìk = 0.0400, the mass of the skier and equipment ...
*December 13, 2008 by johnny*