Sunday

November 23, 2014

November 23, 2014

Number of results: 29,888

**Phyics**

A ray of light strikes a mirror at an angle of 26 degrees to the normal. What is the angle of reflection? Answer in units of degrees .
*February 27, 2011 by Maria*

**physics**

In a mall, a shopper rides up an escalator between floors. at the top of the escalator, the shopper turns right and walks 9.00m to store. the magnitude of the shopper's displacement from the bottom of the escalator is 16.0m. the vertical distance between the floors is 6.00m. ...
*October 21, 2007 by ajo*

**Math**

An airplane over the Pacific Ocean sights an atoll at an 7° angle of depression. If the plane is 850 m above the water, how many kilometers is it from a point 850 m directly above the atoll?
*November 14, 2011 by dale*

**algebra**

An airplane over the Pacific Ocean sights an atoll at an 7° angle of depression. If the plane is 663 m above the water, how many kilometers is it from a point 663 m directly above the atoll?
*February 9, 2013 by Anonymous*

**physics!**

A 64 kg skater, at rest on frictionless ice, tosses a 12 kg snowball with velocity by v = 53i+ 14.0j m/s, where the x- and y- axes are in the horizontal plane. Find x-component v(x) of the subsequent velocity of the skater. As well as Find y-component v(y) of the subsequent ...
*March 23, 2012 by Eliana *

**physics**

a single bead can slide with negligible friction on a wire that is bent into circular loop of radius 15 cm an in the figure. the circle is always in a vertical plane and rotates steadily about its vertical diameter with a period of 0.450 s. the position of the bead is ...
*September 28, 2013 by hosni*

**Math**

From an observation tower that overlooks a runway, the angles of depression of point A, on one side of the runway, and point B, on the opposite side of the runway are, 6 degrees and 13 degrees, respectively. The points and the tower are in the same vertical plane and the ...
*July 21, 2013 by jasmine*

**Geometry**

In the triangle ABC, the measure of angle A=(5x+3)degrees, the measure of angle B=(8x-2)degrees, and the measure of angle C=(5x-1) degrees. Find the measure of each angle.
*September 7, 2012 by Shelby*

**physics**

1)A 5.0 cm real object is placed at a distance of 30.0 cm from a concave mirror of focal length 10.0 cm. Find the location of the image. (30)(10)/5.0 15 or (30)(5.0)/10 60 I don't know which one 2)What must be the minimum height of a plane mirror so that a boy of height 162 cm...
*April 7, 2008 by Jon*

**Physics**

A 0.2 kg hockey puck is placed against a spring lying on a horizontal frictionless surface. The spring is compressed 0.2 m, with the hockey puck, and then released. The hockey puck when released is able to go up a frictionless slope with an angle of 30 degrees to a height of 0...
*December 5, 2010 by Amy*

**Geometry**

1. An airplane is flying at 36,000 feet directly above Lincoln, Nebraska. A little later the plane is flying at 28,000 feet directly above Des Moines, Iowa, which is 160 miles from Lincoln. A.assuming a CONSTANT rate of descent, what was the angle of descent? B. What is the ...
*March 26, 2012 by Leah*

**My Friend Needs Help With a Calc Problem.**

how does five degrees east of north keep a plain going north when the wind pushes the plain four point six degrees west of north? This is not calculus. It is a vector problem. THe wind is pushing the plane west. If you need the solution, to find the direction of the wind, a ...
*October 12, 2006 by Sarah*

**Physics**

1) A jetliner, traveling northward, is landing with a speed of 69.3 m/s. Once the jet touches down, it has 787 m of runway in which to reduce its speed to 13.6 m/s. Compute the average acceleration (magnitude and direction) of the plane during landing (take the direction of ...
*May 27, 2012 by Hannah*

**pre-calc**

two observers 3 miles apart and facing each other find that the angles of the elevation of a balloon in the same vertical plane with themselves are 28degree and 31 degree respectively.find the distance from the balloon to the observer located at the 31 angle?
*November 6, 2012 by Haley*

**Physics**

A stunt motorcyclist is attempting to jump over a river of width 60m using a ramp which is inclined at 30 degrees to the horizontal. Assume the height of the ramp is small enough to be ignored in the calculations. a) What is the minimum speed the stunt motorcyclist would need ...
*March 2, 2014 by Bonnie*

**Geometry**

A circle of radius 1 is drawn in the plane. Four non-overlapping circles each of radius 1, are drawn (externally) tangential to the original circle. An angle ã is chosen uniformly at random in the interval [0,2ð). The probability that a half ray drawn from the centre of the ...
*April 20, 2013 by Anonymous*

**Physics I NEED HELP!!!**

of 0.13 kg is attached to a string with a length of 0.95 m. we choose the potential energy to be zero when the string makes an angle of 90 degrees with the vertical. (a) find the potential energy of this system when the string makes an angle of 45 degrees with the vertical. (b...
*January 26, 2011 by Erica L*

**Physics I NEED HELP!!!**

of 0.13 kg is attached to a string with a length of 0.95 m. we choose the potential energy to be zero when the string makes an angle of 90 degrees with the vertical. (a) find the potential energy of this system when the string makes an angle of 45 degrees with the vertical. (b...
*January 26, 2011 by Erica L*

**Trigonometry**

in a diagram, PRS is a straight line. PQ = 9.2 cm, QS= 7.6cm and angle QPR =38 degrees.QR is perpendicular to PS. Calculate angle PQS to nearest 0.1 degrees
*September 22, 2012 by zoya*

**physics**

If the back of the truck is 1.0 above the ground and the ramp is inclined at 26, how much time do the workers have to get to the piano before it reaches the bottom of the ramp?
*September 21, 2010 by DP*

**phusics**

A car can slow down at 5.10 m/s2 without skidding when coming to rest on a level road. What would its acceleration be if the road were inclined at 12o uphill?
*October 4, 2011 by william*

**physics**

A wet bar of soap slides freely down a ramp 2.0 m long inclined at 6.8o. How long does it take to reach the bottom? Neglect friction.
*April 11, 2012 by myra*

**Physics**

A stationary arrangement of two crayon boxes and three cords. Box A has a mass of 11.0kg and is on a ramp at angle è=30.0 degrees; box B has a mass of 7.00 kg and hangs on a cord. The cord connected to Box A is parallel to the ramp which is frictionless (a) What is the tension...
*December 8, 2006 by Carla*

**math**

find the measure of each angle (x+17)degrees and x degrees. This is a right angle, not sure how to set up this problem.
*October 31, 2010 by gmoney*

**geometry**

kite ABCD with angle A=60 degrees and angle C=90 degrees, diagonal DB=12 find the area and perimeter
*November 30, 2010 by Kathy*

**trig**

Find the reference angle for each given angle: a) 325 degrees b) 14pi/3 c) -190 degrees
*January 26, 2012 by Anonymous*

**Repost - Geometry question**

"please help me" posted this earlier: If m angle sign 1=37 degrees what is m angle sign 4 My answer: 43 degrees which is wrong. Correct answer: 37 degrees I don't understand how to do this.
*June 5, 2014 by Writeacher*

**Physics**

A book is launched up a frictionless ramp that has an angle of 35 degrees to the horizontal.If the Book's initial speed is 2.0 m/s^2 , how far up the ramp does it slide? I got 15.24. Any help would be greatly appreciated.
*February 10, 2009 by Harold*

**Physics**

A mass (m) rest on a frictionless slope within our physics lab room. The angle of the ramp with respect to the floor is 35 degrees. What is the magnitude of the mass's acceleration?
*September 12, 2011 by Diane*

**Physics**

A mass (m) rest on a frictionless slope within our physics lab room. The angle of the ramp with respect to the floor is 35 degrees. What is the magnitude of the mass's acceleration?
*September 12, 2011 by Diane*

**English**

I have a few doubts on two sentences. 1) Can you say that a TV programme is nice or beautiful? 2) Last night was the first episode. The first episode was last night. 3) Last night there was the first episode. In sentence 2 the subject is after the verb. When is this possible? ...
*December 10, 2011 by Henry2*

**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**

Two identical thin wires are oriented along the x and y axes. With current on x plane going North. Current on y plane going West.Both carry the same current I, and there is no electrical contact between the wires. The points A, B, C, D are each equidistant from both wires. A: ...
*March 16, 2013 by Melissa*

**math:)**

If the given point is on the terminal arm of an angle A in standard position, angle A is greater than or equal to 0 degrees and it is less than or equal to 180 degrees, find the measure of angle A, to the nearest tenth of a degree. a) (4,3) b) (12,5) c) (-6,8) d) (-24,7) ...
*December 18, 2012 by Nicole*

**geometry**

Point C is in the interior of angle ABD. The measure of angle ABD is 40 degrees. The measure of angle DBC is 3x-5. If angle ABC is 22 degrees, what is "x"?
*September 28, 2014 by David*

**trigonometry**

a clock has a dial face of 12 inches radius the minute hand is 9 inches while the hour hand is 6 inches the plane of rotation of the hour hand is 2 inches above the plane of rotation of the minute hand. Find the distance between the tips of the minute and hour hand at 5:40 am.
*March 18, 2014 by Rose*

**Plane and Spherical Trigonometry**

A man walks 20 meters from point A to point B, Then he turns 80 degrees and walks 35 meters towards point C. How long is the distance AC? Draw the triangle
*October 2, 2014 by Nathan*

**geometry**

This question is about the shape of a kite. LINE AC bisects ANGLE BCD and ANGLE BAC ANGLE BCD = 50 degrees ANGLE BAD = 80 degrees LINE DC = 10mm LINE BE = 3mm What is the area of the kite?
*May 19, 2013 by beck*

**dynamics**

the 1500 kg automobile is travelling up the 20 degree inclined at a speed of 6 m/s , if the driver wishes to stop his car in a distance of 5m , determine the frictional force at the pavement which must be supplied by the rear wheels.
*December 30, 2012 by umesh*

**physics newtons laws**

A 184 N bird feeder is supported by three cables. angle 1 is 60 degrees and angle 2 is 30 degrees Find the tension in each cable.
*October 18, 2009 by luc*

**physics newtons laws**

A 184 N bird feeder is supported by three cables. angle 1 is 60 degrees and angle 2 is 30 degrees Find the tension in each cable.
*October 18, 2009 by luc*

**geometry**

find measurement angle bac db and dc are paralell, da intersects bc, angle a is 65 degrees so i multipied by two and came up with the answer 130 degrees, is this correct? thanks
*October 14, 2013 by ann*

**Physics -- check answers please**

Light travelling in water is incident on air refracts at an angle of 27 degrees. What is the angle of incidence? my answer: 37 degrees
*July 28, 2014 by Liz*

**geometry2**

i need help with this problem.an airplane over the pacific sights an atoll at an 8 angle of depression. if the plane is 520 m above water, how many kilometers is it from a point 520 m directly above the center of the atoll?
*April 26, 2012 by Remi*

**Math 7 - Homework Question Check **

12. Is the figure below a right triangle? On the lines below, explain how you determined your answer. Answer - The figure below is not a right triangle. The reason why it's not a right triangle is because this figure is a acute angle. Acute angle is less than 90 degrees and ...
*April 16, 2012 by Laruen *

**physics **

The pilot of an aircraft wishes to fly due west in a 50.0 km/h wind blowing toward the south. The speed of the aircraft in the absence of a wind is 228 km/h. a) How many degrees from west should the aircraft head? Let clockwise be positive. Answer in units of degrees. b) What ...
*October 15, 2014 by Danny*

**physics**

an airplane is flying in a horizontal circle at a speed of 430 km/h if its wings are tilted 40 degrees to the horizontal what is the radius of the circle in which the plane is flying? assume that the required force is provided entirely by an "aerodynamic lift" that is ...
*May 27, 2009 by chelsea*

**Physics**

Two parallel, uniformly charged, infinitely long wires carry opposite charges with a linear charge density ? = 5 £gC/m and are 8 cm apart. What is the magnitude and direction of the electric field at a point midway between them and 49 cm above the plane containing the two ...
*February 17, 2012 by Long*

**physics**

Consider a 20 cm long cylindrical glass of refractive index n=2.0. Left end of it is a concave spherical mirror with radius of curvature 12 cm for an object O inside the cylinder. The shape of the right end of the cylindrical glass is not known. If the object is at 10 cm to ...
*October 16, 2011 by Karaokyanus*

**Calculus 3**

Vectors The thrust of an airplane's engine produces a speed of 400 mph in still air. The wind velocity is given by <-20,30>. In what direction should the plane travel to fly due south? Give your answer as an angle from due south.
*May 11, 2011 by Anonymous*

**Physics**

An airplane flies 340 km due east, makes a right-angle turn, and then flies 390 km due north. Find the magnitude of the plane’s displace- ment from its starting point. Neglect the curvature of the earth. Answer in units of km
*September 30, 2012 by Crystal*

**English**

Can you please check if the two answers to the questions (3/4) are correct? It's really urgent. Thank you. 1)Jamal is planning a trip around the world on his motorbike with his friend Simon. 2)They are going to leave from London next week. Then they will drive across Europe, ...
*April 30, 2011 by Henry1*

**Physics**

A 10N block is attached to the wall by a rope on a frictionless surface. If the lower surface makes an angle of 30 degrees with the horizontal, calculate the (a) normal force (b) tension on the rope.
*November 8, 2011 by Lexi*

**Physics**

A 275-gram ball bounces off a wall. The ball stays in a horizontal plane throughout the motion. The ball strikes the wall with a speed of 4.50 m/s at an angle of 𝜃 = 35.0o relative to the wall and rebounds with the same speed at the same angle. If the ball is in ...
*May 27, 2014 by Tim*

**physics**

A 45.4 kg sign is hanging in two wires as illustrated below. If angle A is 53.5 degrees and angle B is 29.6 degrees, what is the tension in the left wire? Give your answer in newtons
*February 16, 2014 by Betty*

**physics**

A 1.8 kg particle-like object moves in a plane with velocity components vx = 20 m/s and vy = 50 m/s as it passes through the point with (x, y) coordinates of (3.0, -4.0) m. (a) What is its angular momentum relative to the origin at this moment? 1 kg · m2/s (b) What is its ...
*January 5, 2011 by Joey*

**geometry**

in triangle ABC, AC is produced to D. If angle A= 60 degrees and B= 85 degrees, find angle BCD
*January 19, 2012 by carmela*

**physics**

a ladder AP of length 5m inclined to a vertical wall is slipping over a horizontal surface with velocity 2m/s , when A is at a distance 3m from ground . what is the velocity of centre of mass at this moment?
*January 16, 2011 by sreeram*

**physics**

a ladder AP of length 5m inclined to a vertical wall is slipping over a horizontal surface with velocity 2m/s , when A is at a distance 3m from ground . what is the velocity of centre of mass at this moment?
*January 16, 2011 by jerf*

**physics**

If the back of the truck is 1.5 {\rm m} above the ground and the ramp is inclined at 24{\rm ^{\circ}}, how much time do the workers have to get to the piano before it reaches the bottom of the ramp?
*June 23, 2011 by JT*

**Physics**

A 500-g block is shot up a surface 25° inclined with the horizontal with an initial speed of 200cm/s. How far up the incline will it go if the coefficient of friction between it and the incline is 0.150?
*November 3, 2013 by Anonymous*

**Physics**

Two transparent media F and G are separated by a plane boundary. The speed of light in medium F is 2.0x108 m/sec and in medium G is 2.5x108 m/sec. The critical angle for which a ray of light from F to G is totally internally reflected is
*October 9, 2012 by Judish*

**geometry**

YW bisects angle XYZ. m of angle XYW = (2x + 7)degrees and m of angle XYZ = (6x - 8)degrees. Find the value of 'x'.
*November 28, 2011 by Mekolily*

**geometry **

A triangle has an angle that is 83 degrees and another angle that is 40 degrees. Using this information, what is the degree of the third angle of the triangle?
*June 2, 2012 by lupita *

**physics**

A 1.90-kg object is attached to a spring and placed on frictionless, horizontal surface. A horizontal force of 14.0 N is required to hold the object at rest when it is pulled 0.200 m from its equilibrium position (the origin of the x axis). The object is now released from rest...
*January 26, 2011 by Roo Kun*

**math: Calculus - Algebraic Vectors**

A light plane is travelling at 175 km/h on a bearing of N8°E in a 40 km/h wind from N80°E. Determine the plane's ground velocity using algebraic vectors. The answer for this question is: 167 km/h , N5°W ---------------- My Work: (a , b) = ( | r | * cosθ , | r | * sinθ...
*February 18, 2008 by Anonymous*

**Calculous**

Evaluate sin(theta) and cosine (theta) for the angle theta The graph gives you a point of (0.6,-0.8) on the x y coordinate plane with a radius of what appears to be 1 ( unit circle ) sin (theta) = cos (theta) =
*October 31, 2014 by Larry*

**Physics**

Two objects collide and bounce off one another. After the collision, object m1 = 1.67 kg moves off at 14.5 m/s at a heading of 327 degrees. Object m2 = 1.66 kg moves off at 8.9 m/s at a heading of 211 degrees. Initially, m2 was traveling at 11.8 m/s at a heading of 318 degrees...
*January 16, 2011 by Joan*

**word problem**

An airplane is flying with a heading of 60 degrees east of north at 450 mph. A wind is blowing at 37 mph from the north. Find the plane's ground speed to the nearest mph and direction to the nearest degree. Thanks.
*March 28, 2008 by jen*

**Calculus/Vectors**

An airplane heads due south with an air speed of 480km/h. Measurements made from the ground indicate that the plane's ground speed is 528km/h at 15 degrees east of south. Calculate the wind speed.
*May 2, 2011 by Anonymous*

**math**

in a triangle the sum of the angle is 180degrees. if angle A is three times angle B and Angle C is 10 degrees more than twice Angle A. Find the measures of the three anges to the newarest degree
*October 15, 2014 by felesia*

**spanish**

can anyone please check my grammar for these sentences, thank you? 1. Before the plane started to move, I took a deep breath. Antes de el avione empezó moverse, yo tomé respire hondo. 2. I felt a little bit nervous because it was my first time to fly by myself. Me sentí un ...
*April 11, 2009 by no name*

**p6**

A 5.40 cm diameter wire coil is initially oriented so that its plane is perpendicular to a magnetic field of 0.510 T pointing up. During the course of 0.130 s, the field is changed to one of 0.300 T pointing down. What is the average induced emf in the coil? are the angles the...
*October 9, 2010 by dude*

**Geometry**

ABC is an acute angle triangle with points D and E on BC and AC, respectively such that BE and AD are altitudes. AD and BE intersect at H. If \angle BCA = 39 ^\circ and \angle EBA = 2 \angle DAB , what is the measure of \angle ABC (in degrees)?
*February 28, 2013 by John*

**Geometry**

ABC is an acute angle triangle with points D and E on BC and AC, respectively such that BE and AD are altitudes. AD and BE intersect at H. If \angle BCA = 39 ^\circ and \angle EBA = 2 \angle DAB , what is the measure of \angle ABC(in degrees)?
*March 1, 2013 by John*

**Geometry**

MNPQ is a rhombus. The measure of angle MRQ is (13t-1) degrees, and the measure of angle PQR is (7t+4) degrees. what is the measure of angle PQM?
*November 4, 2010 by alex*

**math**

MNPQ is a rhombus. The measure of angle MRQ is (13t-1) degrees, and the measure of angle PQR is (7t+4) degrees. what is the measure of angle PQM?
*November 4, 2010 by alex*

**Physics**

One kind of slingshot consists of a pocket that holds a pebble and is whirled on a circle of radius r. The pebble is released from the circle at the angle θ so that it will hit the target. The angle in the drawing is 33.4°. The distance to the target from the center of ...
*September 23, 2012 by Ryan C.*

**Algabra 2**

An airplane cruises northeast at a steady rate. Its speed can be broken down into two components:320 miles per hour due north and 40 milers per hour due north be the direction of the positive y-axis and let due east be the direction of the positive x-axis. Write parametric ...
*December 19, 2011 by Raygan*

**Physic**

I am confuse about this one question can some one please help me. The Navy wants a new airplane launcher for their aircraft carriers and you are on the design team. The launcher is effectively a large spring that pushes the plane for the first 3.49 meters of the 24.2-meter ...
*October 13, 2012 by Janki Patel*

**physics**

A small girl and boy take a sled up to the top of a snow covered slope which is inclined 30 degrees above the horizontal. The girl, boy and the sled have a mass of 160 kg. The coefficient of static friction is 0.28 and the coefficient of kinetic friction is 0.14 between the ...
*December 11, 2012 by Anonymous*

**physics**

A small girl and boy take a sled up to the top of a snow covered slope which is inclined 30 degrees above the horizontal. The girl, boy and the sled have a mass of 160 kg. The coefficient of static friction is 0.28 and the coefficient of kinetic friction is 0.14 between the ...
*December 11, 2012 by Anonymous*

**algebra 2**

A flagpole at a right angle to the horizontal is located on a slope that makes an angle of 12 degrees with the horizontal. The pole's shadow is 16 meters long and points directly up to the slope. The angle of elevation of the sun is 20 degrees. Draw the triangle. Write an ...
*December 7, 2010 by katie*

**algebra**

A flagpole at a right angle to the horizontal is located on a slope that makes an angle of 12 degrees with the horizontal. The pole's shadow is 16 meters long and points directly up to the slope. The angle of elevation of the sun is 20 degrees. Draw the triangle. Write an ...
*December 8, 2010 by marlie*

**ALGEBRA**

In triangle ABC, the measure of angle B is 27 degrees more than three times the measure of angle A. The measure of angle C is 48 degrees more than the measure of angle A. Find the measure of each angle.
*March 25, 2012 by PLEASE HELP*

**physics**

please help me!! i need to explain what is the easiest angle to lift an object. to use as less newton as possible/ the object will lay on surface that i can state its degree/ the degree that requiers the lowest force needed is 26.91 i found it but my proffesor wants me to give...
*November 15, 2010 by moti*

**geometry**

Two lines intersect to form two pairs of vertical angles.Angle 1 with measure (20x + 7) degrees and angle 3 with measure (5x + 7y + 49) degrees are vertical angles. Angle 2 with measure (3x - 2y + 30) degrees and angle 4 are vertical angles.Find the values x and y and the ...
*April 15, 2012 by Tyler*

**PHYSICS HELP**

A 320-N sphere 0.20 m in radius rolls without slipping 6.0 m down a ramp that is inclined at 25° with the horizontal. What is the angular speed of the sphere at the bottom of the slope if it starts from rest?
*November 3, 2010 by A*

**Physic**

A 290-N sphere 0.20 m in radius rolls without slipping 6.0 m down a ramp that is inclined at 31° with the horizontal. What is the angular speed of the sphere at the bottom of the slope if it starts from rest?
*November 10, 2011 by Nikki*

**physics**

A gardener pulls a roller along the ground through a distance of 20 m.if he applies a force of 20 kg wt in a direction inclined at 60 degree to the ground.find the work done by him (take g=10m\s )
*August 2, 2013 by manish kumar*

**st.xavier**

Determine the horizontal force P required to start the movement of the 200 lb blockup the 300inclined surface. The static coefficient of friction between the inclined surface and the block is ms = 0.25.
*September 16, 2013 by pankaj*

**Physics**

4. A 500-g block is shot up a surface 25° inclined with the horizontal with an initial speed of 200cm/s. How far up the incline will it go if the coefficient of friction between it and the incline is 0.150? Thank youuuu!
*November 3, 2013 by Anonymous*

**physics**

For circular motion in the vertical plane, what is the centripital acceleration at the bottom of the circle? What is the magnitude of the centripetal acceleration at the top of the trajectory ? express your ans. in terms of g, M and T, where is T is tension and M is mass of ...
*October 1, 2013 by ss01*

**physics**

A mass of 2.6 kg lies on a frictionless table, pulled by another mass of 4.7 kg under the influence of Earth’s gravity. The acceleration of gravity is 9.8 m/s2 .If the acceleration of the object has a magni- tude of 3.5 m/s2, what is the angle θ between the two forces? ...
*October 12, 2012 by Natalie*

**math-light**

An object 5 millimeters high is located 15 millimeters in front of a plane mirror. How far from the mirror is the image located? A. 5.0 millimeters B. 7.5 millimeters C. 15 millimeters D. 30 millimeters
*May 31, 2011 by Anonymous*

**Physics**

A plane leaves Seattle, flies 85 mi at 22 degrees north of east, and then changes direction to 48 degrees south of east. After flying 115 mi in this new direction, the pilot must make an emergency landing on a field. The Seattle airport facility dispatches a rescue crew. ...
*September 12, 2012 by Jean*

**Science**

Compare the angle of refraction with the angle of incidence for all angle of incidences greatter than 0 degrees. what relationships do you notice between the angle of incidence and the angle of refraction? explain why you expect this relationship to be true (thik about the ...
*November 8, 2009 by James*

**trigonometry**

We begin by setting t=sin 18 degrees we weill think of t an an "unknown" angle and solve to get the exact value. Use a double angle formula to show that cos 36 degrees=1-2t^2
*November 12, 2012 by Anonymous*

**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*

**Math (Combinatorics)**

In the plane, the points with integer coordinates are called lattice points. Suppose a flea in the plane jumps from one lattice point to another. Each jump is one unit to the right, one unit to the left, one unit up, or one unit down. If the flea starts at the origin and makes...
*April 29, 2013 by Bob*

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