Thursday

April 17, 2014

April 17, 2014

Number of results: 86,640

**PHYSICS (please help)**

A solid, uniform disk of radius 0.250 m and mass 51.1 kg rolls down a ramp of length 4.60 m that makes an angle of 18° with the horizontal. The disk starts from rest from the top of the ramp. a)Find the speed of the disk's center of mass when it reaches the bottom of the ramp...
*Wednesday, October 31, 2012 at 12:21pm by Sandy*

**algebra**

This is how my book shows it, but I don't know solve the equation by factoring 35-x^2+2x=0 x^2 x^2 35+2x=x^2 -2x=-2x 35-35=x^2-2x-35 0=x^2-2x-35 (x-7)(x+5) (x-7)(x+5) x-7=0 x+5=0 x=7 x=-5 (7)^2-2(7)-35 -5^2-2(-5)-35 49-14-35 25+10-35 0 0 Solution set is {-5,7}
*Friday, March 21, 2008 at 6:30pm by Lisa*

**Quantitative Methods**

a. .25*.35 b. .35*.75+.25*.65 + .25*.35 c. d. I will be happy to critique your thinking. In reality, the events are not independent, assuming the schools judge admission on nearly the same factors.
*Wednesday, March 18, 2009 at 5:12pm by bobpursley*

**PHYSICS HELP 3RD REQUEST**

A box rests on a plank that is inclined to the horizontal. As the angle between the plank and the horizontal increases, does the component of the weight of the box parallel to the plank increase, decrease, or remain the same? Please just answer Suzanne, you are going to have ...
*Tuesday, October 17, 2006 at 6:24am by Suzanne*

**Engineering Physics**

A 4kg box is compress 50 cm on a spring (k=100 N/m) and then slides across a horizontal floor. If (u=0.4) between the box and the floor 1) How much work is done by friction as the box comes to a stop? 2) Assuming the frictional force is constant, how far will the box slide ...
*Sunday, July 8, 2012 at 11:24pm by Christine*

**physics**

Two soccer players start from rest, 25 m apart. They run directly toward each other, both players accelerating. The first player’s acceleration has a magnitude of 0.54 m/s2. The second player’s acceleration has a magnitude of 0.40 m/s2. (a) How much time passes before the ...
*Thursday, September 5, 2013 at 8:17pm by Anonymous*

**math 12 grade**

did you mean x^2 y^5 ??? I will assume that. x+y = 35 ----> y = 35-x product = x^2y^5 = x^2(35-x)^5 d(product)/dx = x^2(5)(35-x)^4 (-1) + 2x(35-x)^5 = 0 for a max of product x^2(5)(35-x)^4 (-1) + 2x(35-x)^5 = 0 x(35-x)^4 [ -5x + 2(35-x) ] = 0 x(35-x)^4 [ -7x + 70 ] = 0 x = ...
*Monday, April 8, 2013 at 7:48am by Reiny*

**Trig**

Half Angle Identities cosx = 7/25 greater than 270 deg and less than 360 Determine cos 1/2x a. -7rt2/10 b. 7rt2/5 c.7/25 d.-4/5 I get 7rt2/5 Is this correct??
*Monday, January 2, 2012 at 8:04pm by Don*

**physics**

A car has an acceleration of 2 m/s2, what does this tell you about the velocity of the car . Explain what is meant by an acceleration of -2 m/s2.
*Sunday, January 9, 2011 at 4:18pm by naomi*

**physics**

One end of a cord is fixed and a small 0.300 kg object is attached to the other end, where it swings in a section of a vertical circle of radius 2.50 m as shown in the figure below. When è = 15.0°, the speed of the object is 6.20 m/s. At this instant, find each of the ...
*Tuesday, October 25, 2011 at 3:59pm by carlton*

**physics**

The mass has nothing to do with the ramp geometry. This is just a trigonometry question. If L is the ramp length, L sin 35 = 1.8 meters L = 3.138 meters
*Tuesday, February 5, 2013 at 10:48pm by drwls*

**physics**

Fb = mg = 7.50kg * 9.8N/kg = 73.5N Fb = 73.5N @ 25 deg. = Weight of box. Fp=73.5s8in25 = 31.06N.=Force parallel to the plane(ramp). Fv = 73.5cos25 = 66.6N = Force perpendicular to the plane(ramp). Ff = u*Fv = 0.312 * 66.6 = 20.78N. a. Fn = F/cos25 - Fp - Ff = ma. 1.1F - 31.06...
*Saturday, August 6, 2011 at 9:29am by Henry*

**physics**

A 1.4-kg block slides across a rough surface such that it slows down with an accerleration of 1.2 m/s2. What is the coefficient of kinetic friction between the block and the surface?
*Tuesday, January 10, 2012 at 2:16pm by amirah*

**physics**

An object moving on the x axis with a constant acceleration increases its x coordinate by 161 m in a time of 12.5 s and has a velocity of 20 m/s at the end of this time. Determine the acceleration of the object during this motion. Answer in units of m/s2.
*Monday, October 3, 2011 at 6:14pm by Sam*

**Physics **

A car starts from rest on a curve with a radius of 150m and tangential acceleration of 1.5m/s2 . Through what angle will the car have traveled when the magnitude of its total acceleration is 2.6m/s2 ?
*Wednesday, October 16, 2013 at 8:35pm by Shawna*

**Physics**

a barrel of oil at rest has a mass of 65kg it is rolled down a 1.2m ramp. Due to constant force exerted on it, the barrel reaches a velocity of 4.2 m/s upon leaving the ramp. Find the constant force on the barrel while it is on the ramp? Help please.
*Monday, August 8, 2011 at 5:53pm by Tyners*

**physics**

Traumatic brain injury such as concussion results when the head undergoes a very large acceleration. Generally, an acceleration less than 800 m/s2 lasting for any length of time will not cause injury, whereas an acceleration greater than 1000 m/s2 lasting for at least 1 ms ...
*Tuesday, September 14, 2010 at 6:17pm by jer*

**physics**

a mass is released from rest from a height of 4m. it slides down a frictionless ramp then along a 20 degree incline section of rough track. how far does it slide along the incline before coming to rest? friction coeficient= .2 ? help! thanks!
*Monday, June 8, 2009 at 6:58pm by mary*

**physics**

2m*sin(45)= length of fall (LOF) this needs to be plugged into equation henry posted. The suitcase does not fall 2m unimpeded. It slides down the ramp at 45 degrees. Thus trig is needed to solve.
*Wednesday, January 19, 2011 at 12:43am by Adam*

**physics**

a) Normally, al objects on earth fall with the same (nearly constant)acceleration (namely 9.81 m/s²). We see here that the firefighter only slides down the pole with an acceleration of 3.11 m/s². This means, that in order to slow down the firefighter, there must be an upward ...
*Thursday, December 11, 2008 at 7:33pm by Christiaan*

**physics**

Objects of masses m1 = 4.00 kg and m2 = 9.00 kg are connected by a light string that passes over a frictionless pulley as in the figure below. The object m1 is held at rest on the floor, and m2 rests on a fixed incline of θ = 39.0°. The objects are released from rest, and...
*Wednesday, September 28, 2011 at 9:04pm by Anonymous*

**Chemistry**

Determine the resulting temperature when 150 g of ice at 0 deg.C is mixed with 300 g of water at 50 deg C.
*Tuesday, February 23, 2010 at 5:45pm by Stacie*

**physics**

Starting from rest, a 75 kg skier slides down a 17.0° slope. If the coefficient of kinetic friction between the skis and snow is 0.120 and it takes 16.9 s to get to the bottom, how long is the ski trail? (Use g = 9.8 m/s2.)
*Tuesday, October 30, 2012 at 1:48pm by Ashley*

**Physics**

Two cars drive on a straight highway. At time t = 0, car 1 passes mile marker 0 traveling due east with a speed of 22.0 m/s. At the same time, car 2 is 1.4 km east of mile marker 0 traveling at 30.0 m/s due west. Car 1 is speeding up with an acceleration of magnitude 3.0 m/s2 ...
*Wednesday, October 3, 2012 at 2:08pm by Anonymous*

**physics**

The alarm at a fire station rings and a 87-kg fireman, starting from rest, slides down a pole to the floor below (a distance of 3.9 m). Just before landing, his speed is 1.3 m/s. What is the magnitude of the kinetic frictional force exerted on the fireman as he slides down the...
*Saturday, February 19, 2011 at 4:52pm by Julius *

**physics **

The alarm at a fire station rings and a 87-kg fireman, starting from rest, slides down a pole to the floor below (a distance of 3.9 m). Just before landing, his speed is 1.3 m/s. What is the magnitude of the kinetic frictional force exerted on the fireman as he slides down the...
*Saturday, February 19, 2011 at 5:43pm by Julius *

**Physics**

What net external force is required to give a 35.7 kg suitcase an acceleration of 2.8 m/s2 to the right? Answer in units of N.
*Monday, September 19, 2011 at 11:06pm by Brett*

**physics**

Take the mass of the Earth to be 5.98 × 1024 kg. If the Earth’s gravitational force causes a falling 74 kg student to accelerate downward at 9.8 m/s2, determine the upward acceleration of the Earth during the student’s fall. Answer in units of m/s2
*Thursday, October 20, 2011 at 12:47am by amanda*

**physics**

the coefficient of kinetic friction between the block and inclined plane is 0.28 and angle è = 65°. What is the block's acceleration (magnitude and direction) assuming the following conditions? (a) It is sliding down the slope. m/s2 (b) It has been given an upward shove and is...
*Tuesday, December 16, 2008 at 10:46am by help*

**physics**

A 35-kg child starting from rest slides down a water slide with a vertical height of 20 m. What is the child’s speed a.)half-way down the slide’s vertical distance b.) three-fourths the distance (ignoring friction)
*Thursday, September 16, 2010 at 10:43am by Crista*

**Calculus**

draw her position just short of the take-off from the ramp. Let her height be y m and her horizontal distance x m. By similar triangles, y/x = 5/1 x = y/5 let her distance up the ramp be d then d^2 = x^2 + y^2 d^2 = y^2/25 + y^2 = (26/25)y^2 d = (√26/5)y dd/dt = (√...
*Thursday, December 3, 2009 at 10:03pm by Reiny*

**physics**

hello! I have been having a lot of trouble with one physics problem that I have for homework: any help would be greatly appreciated! 'A block of mass 12 kg starts from rest and slides a distance of 8 m down an inclined plane making an angle of 40 with the horizontal. The ...
*Sunday, November 25, 2007 at 3:37pm by Ty*

**physics**

The alarm at a fire station rings and a 83-kg fireman, starting from rest, slides down a pole to the floor below (a distance of 3.9 m). Just before landing, his speed is 1.3 m/s. What is the magnitude of the kinetic frictional force exerted on the fireman as he slides down the...
*Thursday, October 17, 2013 at 11:32pm by collin.saccoman*

**English expression**

Write down a sentence in a contraction in each box. incorrect Write down a sentence having a contraction in each box. correct Write down a sentence with a contraction in each box. correct Write down a sentence in a shortened word in each box. incorrect Write down a sentence ...
*Thursday, April 10, 2008 at 10:20pm by Writeacher*

**physics**

A particle moves in the xy plane with constant acceleration. At time zero, the particle is at x = 9 m, y =6 m, and has velocity vo =(4.5 m/s)i + (−4 m/s)j. The acceleration is given by a = (6 m/s2)i + (1 m/s2)j. What is the magnitude of the displacement from the origin (...
*Sunday, September 16, 2012 at 9:34pm by kat*

**physics**

The blades of a ceiling fan have a radius of 0.340m and are rotating about a fixed axis with an intial angular velocity of +1.25rad/s2. When the switch on the fan is turned to a higher speed, the blades acire an angular acceleration of +2.55rad/s2. After 0.480s have elapsed ...
*Tuesday, January 21, 2014 at 4:35pm by bre*

**physics please please please please please**

a block of mass 2.50 kg rests on a ramp. if the coefficient of static friction between the block and ramp is 0.350, what maximum angle can the ramp make with the horizontal before the block starts to slip down?
*Tuesday, February 15, 2011 at 12:25am by JayCee*

**physics**

In general, if v(t)=velocity at time t v0 = initial velocity, and a = acceleration, then v(t)= v0 + at S(t)=v0*t + (1/2)at² Consider individually the displacement of the bicycle, S1, and the car, S2, as a function of time, t. Each of the functions S1(t) and S2(t) can be ...
*Friday, October 9, 2009 at 12:24am by MathMate*

**Physics**

Elle is pushing a box of mass 7.0 kilograms with the force of 25 newtons. If the force of friction is 2.6 newtons, what is the value of acceleration of the box?
*Monday, April 9, 2012 at 3:13pm by Moises*

**Physics**

A car with engine trouble slides 85 meters up along a 14 degree ramp before coming to a stop. If the coefficient of friction between the tires and the road is 0.9, what was the velocity of the car at the bottom of the ramp? I'm not looking for a solution which includes ...
*Sunday, March 10, 2013 at 11:46am by Ed*

**Physics**

Pete slides a crate up a ramp at an angle of 20 degrees by exerting a 244 N force parallel to the ramp. The crate moves at a constant speed. The coefficient of friction is 0.19. How much work did Pete do when the crate was raised a vertical distance of 2.39 m? Answer in units ...
*Wednesday, January 4, 2012 at 9:34pm by Amanda and Leah*

**physics**

Pete slides a crate up a ramp at an angle of 27◦ by exerting a 242 N force parallel to the ramp. The crate moves at a constant speed. The coeﬃcient of friction is 0.4. How much work did Pete do when the crate was raised a vertical distance of 2.22 m? Answer in ...
*Wednesday, March 13, 2013 at 11:19pm by Anonymous*

**Physics**

In the first case, maximum M2, both the component of weight down the plane and friction are in the down plane direction. They add, no minus sign. If the thing is to move the other way, down the ramp, the friction is opposite in direction, up the ramp. So you change the sign of...
*Sunday, December 9, 2007 at 12:55pm by Damon*

**physics**

Determine the net force necessary to give an object with a mass of 1.8 kg an acceleration of 5.7 m/s2.
*Saturday, March 20, 2010 at 11:00pm by Michelle*

**physics**

Determine the net force necessary to give an object with a mass of 2.1 kg an acceleration of 3.5 m/s2.
*Friday, October 1, 2010 at 7:32pm by carrey*

**NU**

Determine the net force necessary to give an object with a mass of 3.4 kg an acceleration of 4.3 m/s2
*Thursday, February 16, 2012 at 5:31pm by Sarah*

**Physics**

A novice skier, starting from rest, slides down a frictionless 35.0 degree incline whose vertical height is 140 m. 1. How fast is she going when she reaches the bottom?
*Monday, November 1, 2010 at 1:16pm by Nick*

**Physics**

A novice skier, starting from rest, slides down a frictionless 35.0 degrees incline whose vertical height is 140 m. 1. How fast is she going when she reaches the bottom?
*Tuesday, November 2, 2010 at 12:03pm by Nick *

**physics**

a) 325 sin 20 b) it is not accelerating so the sum of forces in any direction is zero. c)Call x positive up the plane. The thing is moving up the plane, in the plus x direction the friction force resists the motion so it acts down the plane, in the -x direction Sum all forces ...
*Sunday, January 13, 2008 at 7:52pm by Damon*

**Physics**

A hockey puck is hit on a frozen lake and starts moving with a speed of 12.2 m/s. Ex- actly 6.70 s later, its speed is 6.20 m/s. The acceleration of gravity is 9.81 m/s2 . a) What is its average acceleration? Answer in units of m/s2
*Monday, February 3, 2014 at 5:47pm by Charlie*

**Physics**

A 6.7 kg package starts from rest and slides down a mail chute that is 50 m long and has a vertical drop of 10m. If the velocity of the package at the bottom of the chute is 4m/s what is the average frictional force on the package as i slides down the chute?
*Sunday, October 21, 2012 at 9:29pm by Jazmin*

**geometry**

Determine the measure of angle B of triangle ABC given the following information A= 42 deg c = 12 C = 96 deg
*Sunday, October 21, 2012 at 1:05pm by joe*

**physics**

A block of mass 12.0 kg slides from rest down a frictionless 35.0° incline and is stopped by a strong spring with k = 4.00 104 N/m. The block slides 3.00 m from the point of release to the point where it comes to rest against the spring. When the block comes to rest, how far ...
*Tuesday, October 11, 2011 at 6:40pm by Anonymous*

**Physical Science**

Greyhounds can accelerate at 7/m/s2 at a start of the race . How much force does it take a 35 kg dog to produce this acceleration?
*Tuesday, December 11, 2012 at 7:11pm by Casey*

**physics**

a 4kg box sits, at rest,on the table what is the box's acceleration? b)how much does the box weight? c) what other force acts on the box? how big is this force?
*Wednesday, May 16, 2012 at 4:49pm by lisa*

**math**

40 + ( x - 600 ) * 0.35 = 50 + ( x - 600 ) * 0.1 40 + 0.35 x - 600 * 0.35 = 50 + 0.1 x - 600 * 0.1 40 + 0.35 x - 210 = 50 + 0.1 x - 60 0.35 x - 170 = 0.1 x - 10 0.35 x - 0. 1 x = - 10 + 170 0.25 x = 160 Divide both sides by 0.25 x = 160 / 0.25 = 160 * 4 x = 640 Remark : ...
*Saturday, March 10, 2012 at 2:17pm by Bosnian*

**Physics**

A toy slides down an inclined plane which makes an angle of 60 degrees with the horizontal. It starts from rest and achieves a final velocity of 8 m/s in 5 seconds at the bottom of the plane. a. What is the acceleration down the plane? b. What is the distance along the plane ...
*Saturday, November 2, 2013 at 12:39pm by Tsunayoshi*

**college physics**

A block of mass 12.0 kg slides from rest down a frictionless 35.0° incline and is stopped by a strong spring with k = 4.00 104 N/m. The block slides 3.00 m from the point of release to the point where it comes to rest against the spring. When the block comes to rest, how far ...
*Tuesday, October 11, 2011 at 6:16pm by Anonymous*

**Physics**

A block is sent sliding down a frictionless ramp. Its speeds at points A and B are 2.30 m/s and 3.00 m/s, respectively. Next, it is again sent sliding down the ramp, but this time its speed at point A is 4.50 m/s. What then is its speed at point B?
*Sunday, October 2, 2011 at 7:47pm by Trish*

**Physics**

A tennis ball is dropped from 1.41m above the ground. It rebounds to a height of 0.932 m.The acceleration of gravity is 9.8 m/s2 .(a)With what velocity does it hit the ground?(Let down be negative.) Answer in units of m/s. (b)With what velocity does it leave the ground? Answer...
*Saturday, September 12, 2009 at 5:52pm by sandhu*

**physics**

A winch is used to drag a 375 N crate up a ramp at a constant speed of 75 cm/s by means of a rope that pulls parallel to the surface of the ramp. The rope slopes upward at 33 degreesabove the horizontal, and the coefficient of kinetic friction between the ramp and the crate is...
*Sunday, February 26, 2012 at 8:29pm by dillion*

**physics**

Vb=25km/hr @ 90 deg. = Velocity of boat Vw = 10km/hr @ 330 deg. = Velocity of water. X = hor. = 10cos330 = 8.66km/hr. Y = ver. = 25 + 10sin330 = 20km/hr. tanA = Y / X = 20 / 8.66 = 2.3094. A = 66.6 deg. R=X / cosA = 8.66 / cos66.6=21.8km/hr @ 66.6 deg.=21.8km/hr @ 66.6 deg ...
*Sunday, September 4, 2011 at 6:59am by Henry*

**physics**

A 47 N box is pulled along a frictionless horizontal surface by a 25 N weight hanging from a cord on a frictionless pulley? What is the acceleration of the system (box and the weight)?
*Thursday, December 1, 2011 at 9:13pm by dw about it*

**physics**

a 1-kilogram block slides down a frictionless inclined plane with an angle of 35 degrees and 1.0 meters high. what is its velocity at the bottom of the plane?
*Wednesday, May 1, 2013 at 5:43pm by Anonymous*

**pre calc **

If the ramp is 470 ft long, it was measured along the ramp, so it is the hypotenuse. The rise of 32 ft. is the vertical diference in elevations. The angle of inclination is thus sin-132/470 = a little less than 4°.
*Wednesday, March 3, 2010 at 7:10pm by MathMate*

**physics**

A block of mass 25.5 kg is released on a ramp with an angle of 31.70 degrees. The coefficient of friction is 0.45. Find the acceleration.
*Monday, December 3, 2012 at 5:52pm by Jared*

**physics**

Initially, a particle is moving at 5.30 m/s at an angle of 35.0° above the horizontal (+x axis). Two seconds later, its velocity is 5.97 m/s at an angle of 50.0° below the horizontal. What was the particle's average acceleration during this time interval? ________m/s2 (x ...
*Saturday, November 10, 2012 at 10:20pm by Ed*

**Physics**

A Spanish galleon is about to be boarded by bloodthirsty pirates in the shallows of a Caribbean island. To save a box of treasure on board, the captain orders his crew to secretly toss the box overboard, planning to come back for it later. The rectangular box is waterproof and...
*Friday, June 29, 2012 at 1:13am by Tracy*

**Physics**

A Spanish galleon is about to be boarded by bloodthirsty pirates in the shallows of a Caribbean island. To save a box of treasure on board, the captain orders his crew to secretly toss the box overboard, planning to come back for it later. The rectangular box is waterproof and...
*Friday, June 29, 2012 at 11:02am by Tracy*

**Physics**

A Spanish galleon is about to be boarded by bloodthirsty pirates in the shallows of a Caribbean island. To save a box of treasure on board, the captain orders his crew to secretly toss the box overboard, planning to come back for it later. The rectangular box is waterproof and...
*Friday, June 29, 2012 at 2:11pm by angela*

**Physics**

decrease in T = 39+35 = 74 deg down delta L = 10^-5 L (74) = .13172 m = 13.2 cm or about a half a foot
*Wednesday, January 15, 2014 at 5:45pm by Damon*

**Physics**

Could someone please check another one of my answer for me? Thank you! A commuter backs her car out of her garage with an acceleration of 1.40 m/s2. (a) How long does it take her to reach a speed of 2.00 m/s? (b) If she then brakes to a stop in 0.800 s, what is her ...
*Sunday, September 2, 2012 at 11:58am by Miaow*

**Physics**

An Olympic skier moving at 19 m/s down a 26 degree slope encounters a region of wet snow and slides 136 m before coming to a halt. What is the coefficient of friction between the skis and the snow? ( g = 9.81 m/s2)
*Sunday, January 27, 2013 at 1:01pm by Madison*

**physics**

A train slows down at a constant rate as it rounds a sharp circular horizontal turn. Its initial speed is not known. It takes 19.8 s to slow down from 81 km/h to 37 km/h. The radius of the curve is 164 m. As the train goes around the turn, what is the magnitude of the ...
*Thursday, June 16, 2011 at 12:27am by JRD*

**Physics**

I've got a question: Imagine this scenario where someone releases a marble down an inclined ramp and at the end of the ramp a block is fixed. So the marble will roll down the ramp and it will collide with the block. Since the block is fixed, m(marble)u(marble) + m(block)u(...
*Saturday, November 27, 2010 at 5:11am by Cheesecake*

**PHYSICS**

A 5.00-kg box slides 7.00 m across the floor before coming to rest. What is the coefficient of kinetic friction between the floor and the box if the box had an initial speed of 3.00 m/s?
*Tuesday, March 18, 2014 at 7:09pm by Maria*

**Physics**

V1 = (137km,180deg.). V2 = (412km,133.5deg.). 1. X = hor. = 137cos180 + 412cos133.5 = -137 + (-283.6) = -420.6km. Y = ver. = 137sin180 + 412sin133.5 = 0 + 298.9 = 298.9km. d = sqrt((-420.6)^2 + (298.9)^2=516km. from A to C. 2. tanA = Y/X = 298.9 / -420.6=-0.7107. A = -35.4 deg...
*Sunday, October 9, 2011 at 12:02am by Henry*

**physics**

A car initially traveling at 26 m/s hits the brakes, generating a constant acceleration of -2 m/s2. Under this acceleration, the car comes to a rest. If the tires have radii of 0.33 m, how many revolutions does each tire make as the car slows down and stops? Assume no skidding.
*Thursday, July 12, 2012 at 1:35pm by Jessica*

**Physics**

The angular position of a point on the rim of a rotating wheel is given by è = 8.0t - 3.0t2 + t3, where è is in radians and t is in seconds. (a) What is the angular velocity at t = 5 s? ___________rad/s (b)What is the angular velocity at t = 7.0 s? _________rad/s (c) What is ...
*Wednesday, November 25, 2009 at 11:42am by Jess*

**Physics**

The component of the weight force in the direction down the ramp is F = M g sin 14.3 Set this equal to M a and solve for the acceleration, a. This works because there is no friction to consider. Note that the mass M cancels out.
*Saturday, October 25, 2008 at 2:11am by drwls*

**physics**

A box of mass 52 kg starts from rest to slide down a ramp that makes an angle of 16.6 degrees with respect to the horizontal. 4.1 seconds later, it has covered a distance of 3.98 meters. What is the coefficient of kinetic friction?
*Saturday, February 22, 2014 at 11:57am by Tammie*

**physics**

A box with a mass of 5 kg rests on a ramp with incline of 30 degrees. Calculate the maximum static force to keep the box from sliding dawn the rope.
*Wednesday, February 12, 2014 at 10:21am by Banele*

**chemistry**

The sum all heats gained is zero. masshotwater*cw*deltaTemp + masscoldwater*cw*deltaTempc +Constant*deltaTempc=0 25*cw(35-58)+35(cw)(35-25)+K(35-25)=0 calculate K
*Monday, March 31, 2008 at 11:02am by bobpursley*

**math**

To find the coterminal angle, you can subtract or add 360° until the angle is between 0 and 360°. For example, 361° is more than 360° so we subtract 360° to get 1°. Since 1° is between 0 and 360°, it is the coterminal angle with 361°. You ...
*Monday, October 26, 2009 at 10:43am by MathMate*

**Physics**

The force up the ramp has to be equal to weight down the ramp: mgSinTheta forceaccelerating= mgSinTheta+ma
*Tuesday, October 1, 2013 at 6:58pm by bobpursley*

**Physics**

A package is thrown down a curved ramp as shown in the figure. The package moves from A to B through a quarter-circle with radius R=3.00m. The mass of the package is 25.0kg. The package starts from rest at point A and there is no friction. A) Find the speed of the package at ...
*Tuesday, April 9, 2013 at 5:28pm by Anonymous*

**physics**

(A.) A hawk flies in a horizontal arc of radius 13.4 m at a constant speed of 4.5 m/s. Find its centripetal acceleration. Answer in units of m/s2. (B.) It continues to fly along the same horizon- tal arc but increases its speed at the rate of 1.45 m/s2. Find the magnitude of ...
*Thursday, December 2, 2010 at 11:34pm by Jack*

**physics**

(A.) A hawk flies in a horizontal arc of radius 13.4 m at a constant speed of 4.5 m/s. Find its centripetal acceleration. Answer in units of m/s2. (B.) It continues to fly along the same horizon- tal arc but increases its speed at the rate of 1.45 m/s2. Find the magnitude of ...
*Thursday, December 2, 2010 at 11:33pm by Jack*

**Physics**

When there is no acceleration, the friction force (M g cosA *mu) equals the component of the weight in the direction down and parallel to the incline (M g sin A). Therefore mu = sin A/cos A = tan A Apply that equation both at the maximum ramp angle before slipping (in which ...
*Tuesday, November 3, 2009 at 1:46am by drwls*

**Statistic **

Case 6.4 Maternal Serum Screening Test for Down syndrome Please keep in mind that I do not have a Math back ground so this is brand new to me and like a foreign language that I have never seen nor heard spoken before. Thank you for your help in advance. Pregnant women are ...
*Saturday, February 5, 2011 at 8:14pm by Tammy*

**Memt 202**

If a rod of 1025 steel 0.5 m (19.7 in) long is heated from 20 to 80 deg C (68 to 176 deg F) while its ends are maintained rigid, determine the type and magnitude of stress that develops. Assume that at 20 deg C the rod is stress free.
*Thursday, November 11, 2010 at 1:32am by alok*

**Physics**

If a car starts from rest and travels for 5.0 seconds with a uniform acceleration of +1.5 m/s2. The driver then applies the brakes for 3.0 seconds, causing a uniform acceleration of - 2.1 m/s2.
*Saturday, October 23, 2010 at 5:12pm by Bob*

**Physics**

A crate of mass 29 kg is pushed up a ramp by a person as shown in the figure below. The person pushes the crate a distance of 25 m as measured along the ramp. Assume the crate moves at constant velocity. Assume the coefficient of kinetic friction between the crate and the ramp...
*Wednesday, July 11, 2012 at 10:45am by Sierra*

**Math**

- 5 ( 4 x - 14 ) ¡Ý - 25 x + 35 - 20 x + 70 ¡Ý - 25 x + 35 - 20 x + 25 x ¡Ý 35 - 70 5 x ¡Ý - 35 Divide both sides by 5 x ¡Ý - 7 Ansver D
*Wednesday, July 18, 2012 at 9:50pm by Bosnian*

**Physics**

A block slides down a frictionless plane having an inclination of 14.3°. If the block starts from rest at the top and the length of this incline is 1.77 m, find the acceleration of the block. b)What is the block's speed when it reaches the bottom of the incline? i found the ...
*Sunday, October 26, 2008 at 1:53am by Anonymous*

**chemistry**

calculate the energy, in joules and calories required to heat 25.0g of water form 12.5 deg. celcius to 25.7 deg. celcius i know the answer just need to see how to do it especially the calories
*Sunday, January 22, 2012 at 6:58pm by shaun*

**Physics**

Vo = 8.50m/s @ 35 Deg. Xo = 8.5cos35 = 6.96 m/s. Yo = 8.5sin35 = 4.88 m/s. d(up) = Yo*t + 0.5g*t^2 = 0.25 m, 4.88t - 4.9t^2 = 0.25, -4.9t^2 + 4.88t - 0.25 = 0, Use Quadratic Formula to find t and get: t = Tr = 0.94s = Rise time = Time in flight. Time Left = 1.0 - 0.94 = 0.06 s.
*Sunday, December 4, 2011 at 3:48pm by Henry*

**Physics**

Need Help with physics! Two cars drive on a straight highway. At time t = 0, car 1 passes mile marker 0 traveling due east with a speed of 17.0 m/s. At the same time, car 2 is 1.3 km east of mile marker 0 traveling at 30.0 m/s due west. Car 1 is speeding up with an ...
*Thursday, October 4, 2012 at 5:48pm by Brandon*

**Physics**

A box of mass m1 = 10.0 kg rests on a smooth, horizontal floor next to a box of mass m2 = 5.0kg. You push on the box 1 with a horizontal force of F = 31.8 N: a.)What net force on box 2 will cause it to have this acceleration? b.)What the force on box 1 on box 2? (In other ...
*Sunday, February 20, 2011 at 10:57pm by Brandon*

**physics**

(a) Distance, S = 9m initial velocity, u = 0 m s-2 final velocity, v = 2.4 m s-2 acceleration, a (assumed uniform) = (v²-u²)/2S = (2.4²-0²)/(2*9) = 0.32 ms-2 Acceleration due to gravity, g = 9.8 m s-2 component of g along incline = g sin(θ) = 9.8 sin(...
*Sunday, June 13, 2010 at 10:59pm by MathMate*

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