Saturday

December 20, 2014

December 20, 2014

Number of results: 21,509

**Physics**

In the ideal apparatus shown in the diagram, m1 = 2.0 kg. What is m2 if both masses are at rest? How about if both masses are moving at constant velocity? Ideal aparatus is a pulley system with M1 on a 37 degree incline and m2 dangle on the other side of the incline
*April 7, 2010 by Anonymous*

**physics **

As part of a kinetic sculpture, a 5.6 kg hoop with a radius of 3.8 m rolls without slipping. If the hoop is given an angular speed of 2.1 rad/s while rolling on the horizontal and then rolls up a ramp inclined at 17.7◦ with the horizontal, how far does the hoop roll ...
*November 9, 2014 by morg*

**Physics**

Two masses, m1 = 25.0 kg and m2 = 45.0 kg, are attached by a massless rope over a massless pulley as shown above?The angle of the frictionless incline is 27.0 degrees . Assume that m2 starts at rest and falls a vertical distance of 3.00 m. Assume m1 also starts at rest and the...
*October 10, 2014 by polly*

**calculus**

A trough is 10 feet long and 1 foot high. The vertical cross-section of the trough parallel to an end is shaped like the graph of y=x10 from x=−1 to x=1 . The trough is full of water. Find the amount of work in foot-pounds required to empty the trough by pumping the ...
*February 27, 2012 by Caitlyn*

**Physics**

A string along which waves can travel is 2.5 m long and has a mass of 300 g. The tension in the string is 72 N. What must be the frequency of traveling waves of amplitude 6.6 mm for the average power to be 68 W?
*January 21, 2010 by Shawna*

**physical science**

a car traveling along the highway needs a certain amount of force exerted on it to stop.more stopping force may be required when the car has: ;
*February 4, 2011 by denise*

**Physics**

A truck of mass 7520 kg is traveling along a level road at an initial speed of 32.9 m/s and then slows to a final speed of 17.9 m/s. Find the total work done on the truck.
*February 19, 2012 by Tarra*

**physics**

A siren mounted on the roof of a firehouse emits sound at a frequency of 900 Hz. A steady wind is blowing with a speed of 15 m/s. Take the speed of sound in calm air to be 343 m/s. (c) Firefighters are approaching the siren from various directions at 15.0 m/s. What frequency ...
*April 19, 2010 by Stephanie*

**Algebra 1 Answer Evaluation**

Write the equation in point-slope form for the line with the given slope that contains the given point. 1. slope = 3; (5, 12) A: y = 3x - 3?
*May 13, 2014 by Victoria*

**Calculus**

An ant is walking along the curve x^2+xy+y^2=19. If the ant is moving to the right at the rate of 3 centimeters/second, how fast is the ant moving up or down when the ant reaches the point (2,3)? Specify direction.
*November 2, 2014 by Anonymous*

**ncc**

a block of mass M, resting on an incline with angle theta, is attached to a second block of mass m by a cord that passes over a smooth peg at the top of the triangular-shaped incline. all surfaces are frictionless. find the minimum and maximum values of m for which the blocks ...
*November 10, 2013 by Anonymous*

**Physics AP**

A ball is thrown straight upward with a speed of +12 m/s. A) what's the ball's acceleration just after it is thrown? B) how much time does it take for the ball to rise to its maximum height? C) what's the approximate maximum height the ball reaches?
*September 15, 2012 by Anna*

**Physics**

The driver of a Cadillac is traveling at a constant 60mi/hr. A police car is 20m behind the perpetrator when it too reaches 60 mi/hr and at that moment the officer floors the gas pedal. If the police car roars up to the rear of the Cadillac 2.0s later what was its acceleration...
*November 5, 2013 by Alexander*

**Physics**

"An object is rolled up an incline. If the object is 2.75 m up the incline after 4.50s and rolling back down at a velocity of 1.90 m/s, what is the acceleration of the object?" Is this a case of final velocity - initial velocity?? It seems like an easy problem, but I don't ...
*July 5, 2010 by Stuck*

**Math story problem**

Melissa and Emily leave by car from the same location traveling in opposite directions. Melissa leaves at 4:00 traveling at 55mph. Emily leaves at 5:00 traveling at 60 mph. At what time will they be at 325 miles apart?
*December 13, 2012 by David*

**math**

Show that the formula for a line through two points (a1,b1) and (a2,b2) is: y=(b1-b2)/(a1-a2) * x + (a1*b2-a2*b1)/(a1-a2) The slope part looks right. Could someone explain how the y-intercept part makes sense? I would think that the y-intercept is: b1-slope*a1 or b2-slope*a2 ...
*December 6, 2006 by mathstudent*

**Math**

On a grid with points R(-2,-6)& S(3,4), what is the slope of line RS? I don't know how to find the slope. Thank you. The formula for a straight line is y = mx + b m is the slope and b is the y intercept. One way is to plug in the two sets of points listed in the problem and ...
*June 26, 2007 by Joshua*

**Physics**

Two packing crates of masses m1 = 10.0 kg and m2 = 3.50 kg are connected by a light string that passes over a frictionless pulley as in Figure P4.26. The 3.50 kg crate lies on a smooth incline of angle 37.0°. Find the acceleration of the 3.50 kg crate. up the incline: Find the...
*June 9, 2008 by Elisa*

**Physics**

Two packing crates of masses m1 = 10.0 kg and m2 = 6.50 kg are connected by a light string that passes over a frictionless pulley as in Figure P4.26. The 6.50 kg crate lies on a smooth incline of angle 39.0°. a)Find the acceleration of the 6.50 kg crate. m/s2 (up the incline) ...
*September 24, 2008 by scott*

**Physics**

A(n) 160 g block is pushed by an external force against a spring with spring constant of 1260 N/m until the spring is compressed by 11.8 cm from its uncompressed length. The compressed spring and block rests at the bottom of an incline of angle θ = 39.0°. Note that the ...
*October 25, 2014 by Kristy *

**physics**

Two blocks each with weight w are held in place on a frictionless incline. In terms of w ans the angle theda of the incline, calculate the tension in a) the rope connecting the blocks; b) the rope that connects block A to the wall? a) it was wsin(theda) b) it was 2wsin(theda) ...
*November 16, 2006 by Chris*

**Physics**

A mass of m1 = 6.00 kg is sitting on an inclined plane, which meets the horizantal at an angle of 22.0, which has a coefficient of sliding friction of 0.290, which is 3.50 m = L. a string is attached to m1, it is strung over a pulley, and attached to mass m2 = 7.0kg which is ...
*September 30, 2012 by Adrian*

**Physics**

A string along which waves can travel is 2.50 m long and has a mass of 203 g. The tension in the string is 26.0 N. What must be the frequency of traveling waves of amplitude 7.70 mm in order that the average power be 85.0 W?
*December 6, 2011 by Kyle*

**physics**

A person pushes a 11.0 kg lawn mower at constant speed with a force of 82.0 N directed along the handle, which is at an angle of θ = 45.0° to the horizontal.Calculate the normal force exerted vertically upward on the mower by the ground.
*November 5, 2010 by Anonymous*

**physics**

A ball is thrown vertically upward with a speed of +13.0 m/s. (a) How high does it rise? (b) How long does it take to reach its highest point? (c) How long does the ball take to hit the ground after it reaches its highest point? (d) What is its velocity when it returns to the ...
*September 15, 2011 by ashley*

**physics**

A ball is thrown vertically upward with a speed of +10.0 m/s. (a) How high does it rise? m (b) How long does it take to reach its highest point? s (c) How long does the ball take to hit the ground after it reaches its highest point? s (d) What is its velocity when it returns ...
*January 22, 2012 by seanso*

**physics**

A ball is thrown vertically upward with a speed of +10.0 m/s. (a) How high does it rise? m (b) How long does it take to reach its highest point? s (c) How long does the ball take to hit the ground after it reaches its highest point? s (d) What is its velocity when it returns ...
*January 23, 2012 by seanso*

**physics**

A ball is thrown vertically upward with a speed of 19.0 m/s. (a) How high does it rise? m (b) How long does it take to reach its highest point? s (c) How long does the ball take to hit the ground after it reaches its highest point? s (d) What is its velocity when it returns to...
*August 30, 2012 by roger*

**Physics**

A ball is thrown vertically upward with a speed of 15.0 m/s. (a) How high does it rise? (b) How long does it take to reach its highest point? (c) How long does the ball take to hit the ground after it reaches its highest point? (d) What is its velocity when it returns to the ...
*September 21, 2012 by Kelly*

**Math /Algebra**

I was challenged with this question: Explain why the formula for determining slope using the coordinated of two points does not apply to vertical lines. This was my answer: The formula for determining a slope using two points does not apply to vertical lines simply because it ...
*November 18, 2009 by Liza*

**biomechanics**

By actual measurement it has been shown that a sprinter pushes 1700N on each foot at the starting blocks . The right at 34o and the left at 52o Calculate the vertical component for each foot.
*March 23, 2013 by yaya*

**Physics**

A hot air balloon is traveling vertically upward at a constant speed of 3.9 m/s. When it is 20 m above the ground, a package is released from the balloon. After it is released, for how long is the package in the air? The acceleration of gravity is 9.8 m/s
*October 10, 2011 by Ana *

**physics**

A downhill skier crosses the finishing line at a speed of 30 1 ms − and immediately starts to decelerate at 10 m s − 2 . There is a barrier 50 metres beyond the finishing line. (a) Find an expression for the skier’s speed when she is V metres beyond the finishing ...
*July 24, 2014 by Triana*

**Physics C: Mechanics**

A yo-yo has a rotational inertia of 760 g·cm2 and a mass of 200 g. Its axle radius is 4.0 mm, and its string is 100 cm long. The yo-yo rolls from rest down to the end of the string. (a) What is the magnitude of its linear acceleration? cm/s2 (b) How long does it take to reach ...
*October 26, 2010 by Xavier Hernandez*

**physics**

A car is sitting at the top of an inclined plane, which is 5.2 meters long and meets the horizontal at an angle of 12 degrees. The cart is then allowed to roll to the bottom of the incline. What will be the velocity of the cart at the bottom of the incline. (4.61m/s) Please ...
*February 25, 2012 by joe*

**Algebra**

Which of the following describes the end behavior of the graph of the function f(x) = –2x^5 – x^3 + x – 5? A. Downward to the left and upward to the right B. Upward to the left and downward to the right C. Downward to the left and downward to the right D. Upward to the left ...
*July 20, 2009 by Audrey*

**Algebra**

Which of the following describes the end behavior of the graph of the function f(x) = –2x^5 – x^3 + x – 5? A. Downward to the left and upward to the right B. Upward to the left and downward to the right C. Downward to the left and downward to the right D. Upward to the left ...
*July 20, 2009 by Audrey*

**Algebra**

Which of the following describes the end behavior of the graph of the function f(x) = –2x^5 – x^3 + x – 5 A.Downward to the left and upward to the right B.Upward to the left and downward to the right C.Downward to the left and downward to the right D.Upward to the left and ...
*July 23, 2009 by Crystal*

**physics**

A yo-yo has a rotational inertia of 860 g·cm2 and a mass of 150 g. Its axle radius is 3.4 mm, and its string is 90 cm long. The yo-yo rolls from rest down to the end of the string. (a) What is the magnitude of its linear acceleration? 1 cm/s2 (b) How long does it take to reach...
*January 5, 2011 by Joey*

**Physics**

A block of weight = 25.0 sits on a frictionless inclined plane, which makes an angle = 34.0 with respect to the horizontal, as shown in the figure. A force of magnitude = 14.0 , applied parallel to the incline, is just sufficient to pull the block up the plane at constant ...
*October 17, 2010 by Nikohl*

**Physics**

A block of weight = 25.0 N sits on a frictionless inclined plane, which makes an angle = 34.0 with respect to the horizontal, as shown in the figure. A force of magnitude = 14.0 N, applied parallel to the incline, is just sufficient to pull the block up the plane at constant ...
*October 17, 2010 by Eden*

**algebra[please check]**

in questions 1 and 2, write an equation of the line in slope-intercept form. 1. the slope is -4/3; the y-intercept is -2. 2. the slope is 0; the y-intercept is -5. my answers: 1.y=-4/3-2 2. y=-5 ______________________ write an equation of the line that passes through the point...
*October 25, 2009 by rachel*

**physics**

The Graph above shows the speed of a car traveling in a straight line as a function of time. The car accelerates uniformly and reaches a speed Vb of 4.00 m/s in 8.00 seconds. Calculate the distance traveled by the car from a time of 1.20 to 4.40 seconds.
*September 8, 2013 by Karen*

**algebra**

Find the slope of any line perpendicular to the line through points (0,5) and(-3,-4). I found the slope to be 3, but would the answer to the question be -1/3 ? what are your thoughts?? The slope of your given line is (y2-y1)/(x2-x1) = (-4 -5)/(-3-0) = -9/-3 = 3 The slope of ...
*July 26, 2007 by Lindz*

**algebra**

find the slope and the y-intecept f(x)= -9x-7. The slope is_______ and the y-intecept is (0, ___) I came up with the slope is 2 and the y-intecept is (0, 16) am I close
*October 22, 2009 by sonia*

**language (sentence fluency)**

Which of the following options best demonstrates sentence fluency? A The two boys went to the store to buy some milk with their mother and her boyfriend, who had a broken foot after supper. B. The two boys went to the store to buy some milk after supper with their mother's ...
*May 28, 2013 by trey*

**physics**

an elevator weighing 500kg f moving upward and tension in the supporting cable is 50000N.find upward acceleration.
*August 31, 2011 by gallium*

**slope(using intercepts)**

a bamboo plant is growing 1 foot per day. when you first measure it, it is 4 feet tall. a. write an equation to describe the height y, in feet, of the bamboo plant x days after you measure it. would it be: x+y=4? b. what is the y intercept?
*November 5, 2008 by amanda*

**PreCalc**

stacey is standing 5 miles west of the control tower at an airport. A plane took off traveling directly north of the control tower at a rate of 180 mph along the ground at a constant angle of 15 degrees. A)after 12 minutes, what is the angel between Stacey and the plane along ...
*February 9, 2014 by Maddy*

**physics**

f a 57.0 g tennis ball is traveling horizontally at 72.0 m/s (which does occur), and a 55.0 { kg} tennis player leaps vertically upward and hits the ball, causing it to travel at 48.0 m/s in the reverse direction, how fast will her center of mass be moving horizontally just ...
*October 30, 2009 by Anonymous*

**physics**

f a 57.0 g tennis ball is traveling horizontally at 72.0 m/s (which does occur), and a 55.0 { kg} tennis player leaps vertically upward and hits the ball, causing it to travel at 48.0 m/s in the reverse direction, how fast will her center of mass be moving horizontally just ...
*October 30, 2009 by Kim*

**Physics **

A ball is thrown straight upward and returns to the thrower’s hand after 2.90 s in the air. A second ball is thrown at an angle of 32.0 ◦ with the horizontal. At what speed must the second ball be thrown so that it reaches the same height as the one thrown vertically? ...
*December 3, 2011 by Ryan *

**Physics**

A ball is thrown straight upward and returns to the thrower’s hand after 2 s in the air. A second ball is thrown at an angle of 38 degrees with the horizontal. At what speed must the second ball be thrown so that it reaches the same height as the one thrown vertically? The ...
*February 5, 2013 by chris*

**hw**

A car travels along a straight road, heading east for 1 h, then traveling for 30 min on another road that leads northeast. If the car has maintained a constant speed of 56 mi/h, how far is it from its starting position?
*November 24, 2010 by Anonymous*

**algebra**

A man (we'll refer to him as man 1) starts from his home at 8 A.M. and drives a steady rate of 50 MPH. An hour later a second man ( man 2) starts to follow him. Draw a graph to represent these facts. From the graph find when man 2 overtakes man 1. Okay, I imagined at 9 A.M. ...
*June 8, 2010 by Amal*

**physics, please help check**

A rocket car is traveling on a linear horizontal frictionless track when it suddenly runs out of fuel. The car has achieved a speed of 100 meters per second at the very moment the fuel is completely spent. The track then suddenly changes to a 30-degree incline from the ...
*February 21, 2007 by Katrina*

**Chemisrty**

An intravenous line provides a continuous flow of drug directly into the blood. Assuming no initial drug in the blood, the amount of drug in the blood t hours after the dosing begins in m(t) - (a/k)(1-e^-kt), for t (=>)0, where k is the rate constant (again related to half ...
*April 17, 2012 by Rach*

**math**

the slope of a line tells me what? what is the meaning of a slope? Please go to the followig site: http://www.purplemath.com/modules/slope.htm
*December 27, 2006 by jasmine20*

**physics**

A hot air balloon is traveling vertically upward at a constant speed of 3.9 m/s. When it is 10 m above the ground, a package is released from the balloon. After it is released, for how long is the package in the air? The acceleration of gravity is 9.8 m/s 2 . Answer in units of
*November 22, 2011 by Anonymous*

**physics**

A hot air balloon is traveling vertically upward at a constant speed of 2.7 m/s. When it is 11 m above the ground, a package is released from the balloon. After it is released, for how long is the package in the air? The acceleration of gravity is 9.8 m/s 2 . Answer in units ...
*November 27, 2014 by jason*

**physics**

A hot air balloon is traveling vertically upward at a constant speed of 2.7 m/s. When it is 11 m above the ground, a package is released from the balloon. After it is released, for how long is the package in the air? The acceleration of gravity is 9.8 m/s 2 . Answer in units ...
*November 27, 2014 by Anonymous*

**Physics**

The drawing shows a person (weight W = 592 N, L1 = 0.841 m, L2 = 0.410 m) doing push-ups. Find the normal force exerted by the floor on each hand and each foot, assuming that the person holds this position. force on each hand N force on each foot N I post this eailer and O'm ...
*April 4, 2008 by Robinson*

**MATH - GEOMETRY/TRIGONOMETRY**

A 6 foot man stands by a 30 foot radio tower and casts a 10 foot shadow. How long is the shadow cast by the tower and what time is it? I got 50 feet for the length of the shadow. What I cannot find out is, what time is it? I NEED THE TIME OF DAY. **NOT** THE LENGTH OF THE ...
*December 16, 2013 by Griffin*

**physics**

Starting from rest, a 5.0 kg block slides 2.5 m down a rough 30.0 degrees incline in 2.0s. Determine (a) the work done by the force of gravity. (b) the mechanical energy lost due to friction, and (c) the work done by the normal force between block and incline. I know how to do...
*October 23, 2007 by Anonymous*

**physics**

A block at rest. The coefficients of static and kinetic friction are .75(Static) and .64(Kinetic). The acceleration of gravity is 9.8m/s^2 and the mass is 46kg. I've solved for the frictional force which is, 252.0841609N. Though what is the largest angle which the incline can ...
*December 14, 2014 by allan*

**Math PLEASE HELP ASAP**

I really don't know how to do this, need as soon as possible. Please help! A rabbit population satis es the logistic equation dy dt = 2x10^-7y(10^6- y); where t is the time measured in months. The population is suddenly reduced to 40% of its steady state size by myxamatosis. ...
*May 26, 2012 by Lilly*

**physics urgent**

I need help with this problem. I know the answer is (2.1630342940) but I have no idea how to get there. I know i need to sum the forces for each. Block m1( 6 kg ), lies on an incline plane with a coefficient of kinetic friction of 0.15. m1 is connected to mass m2 by a massless...
*October 3, 2014 by jessica*

**physics**

Starting at rest at the edge of a swimming pool, a 72.0-kg athlete swims along the surface of the water and reaches a speed of 1.15 m/s by doing the work Wnc1 = +170 J. Find the nonconservative work, Wnc2 done by the water on the athlete.
*November 16, 2011 by Ed*

**algebra 3**

what is the equation of the line with {3,3} and is perpendicular to the line y= negative 2x plus 3 The slope of the line is -2. The slope of a line perpendicular to this one must be its negative reciprocal, or 1/2. Use the point-slope form to find the other line: y - y1 = m(x...
*January 11, 2007 by Darius Graham*

**physics**

A ball starts from rest and accelerates at 0.520 m/s2 while moving down an inclined plane 9.65 m long. When it reaches the bottom, the ball rolls up another plane, where, after moving 14.40 m, it comes to rest. (a) What is the speed of the ball at the bottom of the first plane...
*October 10, 2009 by Jamie*

**physics**

An object is thrown vertically upward with a speed of 19.1 m/s. How high does it rise? I get 1.86e+01 m How long does it take to reach this highest altitude? I get 1.95e+00 s ------------------------------------------------------ I am stuck on part c, however, which asks How ...
*October 8, 2008 by Luckna*

**math**

A ladder is resting against a wall. the foot of the ladder is 8 feet from the wall, and the top of the ladder is 19 feet from the ground. FIND THE slope of the ladder
*October 16, 2011 by rachel *

**Math/Algebra do u know how to do slope intercept?**

The following problems are in slope,point slope, and slope intercept forms of a line. Could you check these thanks. Find the slope intercept form of a line that passes through these two points (-4,4) and (2,1) Answer: y= -1/2x-2 Find the slope intercept form of a line that is ...
*March 26, 2009 by Chico*

**physics**

To push a 16 kg crate up a frictionless incline, angled at 32° to the horizontal, a worker exerts a force of 108.0 N, parallel to the incline. As the crate slides 1.50 m, how much work is done on the crate by the worker's applied force?
*October 24, 2014 by Abby*

**math**

in the equation 3y - x=2 what is the slope of the line of this equation? Using the equation y=mx+b you have to solve 3y-x=2 for Y. M stands for slope and Y stands for Y intercept Doing that I get y = 1/3x + 2/3 I hope thats what you are looking for! Put it in point slope form...
*January 29, 2007 by cindy*

**physical science**

A roller coaster car rapidly picks up speed as it rolls down a slope. As it starts down the slope, its speed is 4.25 m/s. But 3.2 s later, at the bottom of the slope it's speed is 22.75 m/s what is its average acceleration
*November 6, 2014 by Gracie *

**Algebra II **

What is the equation of the line, in point -slope form, that passes through the given point and has the given slope point: (11,3); slope: 4/11 A. y-3=4/11(x+11) B. y-3=4/11(x-11) C. y-3=-4/11(x-11) D. y-11=4/11(x-3) I think it is A or B...just a lil confused. leaning towards B
*December 16, 2013 by Cassie*

**Physics**

a particle (C) of mass m = 0.2 kg can slide without friction on an inclined plane making an angle alfa (a) = 30 degrees with respect to the horizontal (aka ground) . (C) is launched at at an instant to=0 along a line Ox of greatest slope with an initial velocity of Vo =5 m/s...
*September 24, 2011 by PlzhelptheyllkillmeifIgetthiswrong*

**trig**

a hot air balloon climbs continuously along a 30° angle to a height of 5,000 feet. To the nearest tenth of a foot, how far has the balloon traveled to reach 5,000 feet? Draw a sketch and then solve.
*April 1, 2014 by Alex*

**Physics**

A 13.0 -kg box is released on a 33 degree incline and accelerates down the incline at 0.20 m/s^2 What is the coefficient of kinetic friction? * If I know the friction force impeding the object motion is 67 N. How do I find the coefficient of kinetic friction?
*June 17, 2012 by Mike Joseph*

**chemistry**

In the United States, water used for irrigation is measured in acre-feet. An acre-foot of water covers an acre to a depth of exactly 1 foot. An acre is 4840 yd^2. If desalinated water costs $1950 per acre-foot, how much does desalinated water cost per liter?
*March 2, 2011 by Kathy*

**Physics**

You toss a coin straight up into the air. Sketch the velocity-time and acceleration-time graphs of the coin from the instant it leaves your hand until the instant it returns to your hand. Assume that the positive y direction is upward. Indicate on your graph the moment when ...
*September 29, 2010 by Cristina*

**Calculus/Physics Please help!!**

An intravenous line provides a continuous flow of drug directly into the blood. Assuming no initial drug in the blood, the amount of drug in the blood t hours after the dosing begins in m(t) - (a/k)(1-e^-kt), for t (=>)0, where k is the rate constant (again related to half ...
*April 17, 2012 by Jake*

**Physics**

5. The ball launcher in a pinball machine has a spring that has a force constant of 1.20 N/cm . The surface on which the ball moves is inclined 10.0° with respect to the horizontal. The spring is initially compressed 5.00 cm. Find (a) the launching speed of a 100-g ball when ...
*February 1, 2013 by John Tucker*

**Algebra..**

HELP. Problems 4 - 7: Write an equation for the line in point/slope form and slope/intercept form that has the given condition. 4. Slope = 3/2 and passes through the origin. 5. x-intercept = 4 and y-intercept = -3
*September 14, 2012 by 987:)*

**Physics**

The swim portion of a triathlon takes place in a river and is an out-and-back course. The river has a steady current that is 0.400 m/s and the athletes swim against the current for 750m before returning and swimming with the current for the second 750m. If one competitor can ...
*September 18, 2014 by Chelsea*

**math**

Rodney and James are each 30 feet from a door. Rodney moved one foot closer and James moved half the distant between himself and the door. If each person continued to move in this fashion, who would be closer to the door after 10 moves? Who reaches the door first?
*December 5, 2011 by Tia*

**Algebra**

Not sure on a few of my answers, can you help? 1. Find the slope and y intercept : f(x)=-5x-7 slope = -5 intercept = (0,-7). Is this right? -1/2x=-5/6 my answer was 5/3 was this right? If I have these two sets of coordinate (-4,0) and (0,2) will my slope be -1/2? Same question...
*January 8, 2010 by HGO*

**Physics HELP!!!**

A ball (radius 0.2 m) is rolling on level ground toward an incline. If its velocity is 3 m/s, to what maximum height above the ground does it roll up the incline? The ball is a hollow sphere with a moment of inertia I=(2/3)mr2 (m is the mass of the ball, r its radius).
*October 27, 2010 by Alex*

**MATH**

K we are learning about Linear Equations and Graphs. And I'm doing the Slope-point Form, but I'm kind of having troubles with it. Liek I don't really get how to change the slope point form to the slope intercept one. Here is an example: y-5 = -1/2(x+4) y-5 = -1/2x-2 y-5+5 = -1...
*December 7, 2010 by Alexa*

**physics**

Calculate the acceleration of a sled that is heading down a 50° slope (one that makes an angle of 50° with the horizontal). The coefficient of kinetic friction on ice is μk = 0.100. (Take the x direction to be parallel to and down the slope and the y direction to be ...
*December 14, 2014 by mathew*

**physics**

One side of the roof of a building slopes up at 35.5°. A student throws a Frisbee onto the roof. It strikes with a speed of 15.0 m/s and does not bounce, but slides straight up the incline. The coefficient of kinetic friction between the plastic and the roof is 0.450. The ...
*February 24, 2011 by eric*

**Physics**

The moment of inertia of a solid uniform sphere of mass M and radius R is given by the equation I=(2/5)MR2 . Such a sphere is released from rest at the top of an inclined plane of height h, length L, and incline angle è. If the sphere rolls down the plane, find its speed at ...
*April 7, 2011 by Anonymous*

**physics**

Two blocks with mass m1 = 7.2 and m2 = 7.7 are connected by a massless string over a frictionless and massless pulley. The angle of the incline is equal to 45.0. The kinetic coefficient of friction between m1 and the incline is 0.22. What is the minimum value of the static ...
*October 9, 2011 by Jessica *

**physics**

A 2 kg block situated on a rough incline surface (θ= 37o) and is connected to a spring with k = 100 N/m. The block initially at rest. The block moves 20 cm down the incline before stops. Find the coefficient of friction between the block and the surface. (Can you give all...
*September 6, 2012 by charley*

**physics**

Starting at rest at the edge of a swimming pool, a 72.0 kg athlete swims along the surface of the water and reaches a speed of 1.10 m/s by doing the work Wnc1 = +165 J. Find the nonconservative work, Wnc2 done by the water on the athlete. Thanx in advance.
*October 21, 2009 by jawn*

**Physics**

A 1300 kg car is traveling along a straight road at 20 m/s. Two seconds later its speed is 24 m/s. What is the magnitude of the net force acting on the car during this time? I dont know what equation to use, and I keep getting stuck
*July 17, 2011 by falcon306*

**Algebra2**

Help? Write an equation for the line in point/slope form and slope/intercept form that has the given condition. 4. Slope = 3/2 and passes through the origin. 5. x-intercept = 4 and y-intercept = -3
*November 28, 2012 by Victoria*

**physics**

A child pushes a toy box 4.0m along the fllor with a force of 6.00N directed downward at an angle of 37.0 degrees to the horizontal. a. How much work does the child do? b. Would you expect more or less work to be done if the child pulled upward at the same angle? Wouldn't this...
*September 13, 2006 by fluffy*

**physics**

An elevator is being lifted up an elevator shaft at a constant speed by a steel cable. All fricional effects are negligible. In this situation,forces on the elevator are such that?: A.the upward force by the cable is greater than the downward force of gravity B. the upward ...
*July 2, 2011 by alexa*

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