Tuesday

April 28, 2015

April 28, 2015

Number of results: 17,879

**precalc**

The angle of elevation to the top of a building from a point on the ground 20 degrees and the angle of elevation from a point 25 feet farther away is 12 degrees. Find the height of the building. How would I begin to solve this problem? I do not know what I'm doing wrong, my ...
*December 25, 2014 by adam*

**Math**

What's the value of the missing angle *picture of a triangle and square put together which basically makes a hexagon. angles are 90 degrees, 90 degrees, 130 degrees, 130 degrees. I have to find the last angle.* A. 50 degrees B. 60 degrees C. 100 degrees D. 240 degrees I don't ...
*February 5, 2015 by Anonymous *

**science physics**

a small aircraft experiences s lift force equal to 3.8 times of its weight. a)draw a diagram to show the forces acting on the aircraft when it is flying in a horizontal circle with its wing banked at an angle to the horizontal b)determine the maximum bank angle that the ...
*August 16, 2011 by mira*

**physics**

A firecracker explodes, sending pieces of equal mass in three directions as shown in the diagram. Angle θ is 14 degrees, and angle ϕ is 30 degrees. Assume that the firecracker is initially at rest, and take upward and rightward as the positive directions. What are ...
*July 4, 2014 by Anonymous*

**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 č=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*

**Physics**

A beam of light makes an angle of θi = 53.0˚ with the normal of a slab of transparent material of t=3.80 mm-thickness. The index of refraction of the glass is n2 = 1.39. Angle 3 is 53.1 b) How far vertically (d) is the point at which the beam leaves the glass surface...
*March 13, 2015 by Emily*

**math**

It is a proof. Given: line DB bisects line AC line AD is parallel to line BE AD=BE Prove: DB=EC there are two triangles connected together by point B. They are labled A D B and B E C. D and E are the top points of the triangles. they look like they would be right angle ...
*October 8, 2006 by ann*

**geometry**

1. Initial point: (0, 0); Terminal point: (3, -4) A Lesson 13 B Lesson 13 C Lesson 13 D Lesson 13 E Lesson 13 F Lesson 13 2. Initial point: (3, 5); Terminal point: (-2, -1) A Lesson 13 B Lesson 13 C Lesson 13 D Lesson 13 E Lesson 13 F Lesson 13 In problems 3 and 4, let u = ...
*December 7, 2011 by Cam*

**physics**

an overhead view of the path taken by a 0.162 kg cue ball as it bounces from a rail of a pool table. The ball's initial speed is 1.11 m/s, and the angle č1 is 64.7°. The bounce reverses the y component of the ball's velocity but does not alter the x component. What are (a) ...
*July 7, 2008 by farah*

**Physics**

A simple pendulum consists of a 3 kg point of mass hanging at the end of a 2 m long light string that is connected to a pivot point. a. Calculate the magnitude of the torque (due to gravitational force) around this pivot point when the string makes a 5 degree angle with the ...
*December 7, 2008 by Kathrine*

**physics**

A regional airline flight consists of two legs with an intermediate stop. The airplane flies 380 due north from airport A to airport B. From there, it flies 260 due east to its final destination at airport C. Part A What is the magnitude of the plane’s displacement from its ...
*September 29, 2012 by sammy*

**Math**

According to the Journal of Irreproducible Results, any obtuse angle is a right angle! Here is their argument. Given the obtuse angle x, we make a quadrilateral ABCD with DAB = x, and ABC = 90◦, andAD = BC. Say the perpendicular bisector toDC meets the perpendicular ...
*April 2, 2010 by Jewel*

**physics**

The displacement vector for a 15.0 second interval of a jet airplane's flight is (3150, −2430) m. (a) What is the magnitude of the average velocity? (b) At what angle, measured from the positive x axis, did the airplane fly during this time interval? Express the angle as...
*December 20, 2010 by calantha*

**Physics**

An arrow is shot at an angle of above the horizontal. The arrow hits a tree at an angle 45 degrees horizontal distance D = 220 away, at the same height above the ground as it was shot. Use g = 9.8 for the magnitude of the acceleration due to gravity. Please provide formulas ...
*September 28, 2012 by Nami*

**Trigonometry - Geometry - side lengths **

In convex quadrilateral ABCD, angle A is congruent to angle C, AB=CD=180, and AD is not equal to BC. The perimeter of ABCD is 640. Find cos A. Hmm...I drew the diagram, and labeled some things, I drew an altitude from D to AB and did some other things, but no success was ...
*December 6, 2013 by Sam*

**Physics**

The figure shows a 7 kg block being pulled along a frictionless floor by a cord that applies a force of constant magnitude 20 N but with an angle θ(t) that varies with time. When angle θ = 29°, at what rate is the block's acceleration changing if (a)θ(t) = (3 × ...
*January 21, 2014 by John*

**math**

what is the area of the largest rectangle formed when a plane intersects a right circular cylinder with a diameter of 12cm and a height of 15cm?
*December 14, 2007 by billy*

**physics**

Over a period of 9.0 seconds a plane changes its velocity from 29.5 m/s to 45.7 m/s. What is its uniform acceleration? ---------------- I'm reviewing for my final and i can not think of what the formula to solve this is.
*December 17, 2009 by ash*

**Math - Geometry**

Suppose point P and lines l and m all lie on the same plane. If the distance from P to l and from P to m is 3, which of the following could be true? A)l is parallel to m B)l is perpendicular to m C)l=m D)any of these
*December 23, 2009 by Thamara*

**physics**

A 3 meter tall 40 degree inclined plane with a coefficient of friction of .3 with a box sliding from its top has this acceleration and final velocity.
*March 1, 2010 by jordan*

**Geography**

I was wondering if a plane flew west and kept flying, would it be possible for it to never fly into night if it didn't stop?
*April 19, 2010 by Andrew*

**math**

joe and his family are flying to texas. their plane flies 645 miles at 215 mph. how long does the trip take?
*May 28, 2010 by Anonymous*

**SCIENCE**

A pilot of a light plane heads due north at air speed of 400km/h and wind is blowing from the west at a 60km/h.what is
*July 12, 2010 by ANTHONY*

**11th grade**

the line with the equation x+y=3 is graphed on the same xy-plane as the parabola with vertex (0,0) and focus (0,3). What is the point of intersection of the two graphs?
*September 19, 2010 by edith*

**11th grade**

the line with the equation x+y=3 is graphed on the same xy-plane as the parabola with vertex (0,0) and focus (0,3). What is the point of intersection of the two graphs?
*September 19, 2010 by edith*

**Physics**

A plane travels with a uniform velocity of 3.399x10^1 m/s for a period of 2.267x10^0 seconds. What distance is travelled during this time, in meters
*October 14, 2010 by christine*

**physics**

How long does it take a plane, traveling at a speed of 170 m/s, to fly once around a circle whose radius is 2900 m?
*October 23, 2010 by bill*

**physics**

A 4kg box starts up a 30 degree incline with 128J of kinetic energy. How far will it slide up the plane if the co-efficient of friction is 0.3?
*October 31, 2010 by manu*

**physics**

A 4kg box starts up a 30 degree incline with 128J of kinetic energy. How far will it slide up the plane if the co-efficient of friction is 0.3?
*October 31, 2010 by LOST..*

**Physics**

A bomber is flying at a velocity of 200.0 km/hr with an altitude of 1.5 km. How far (horizontally) from its intended target should the plane drop the bomb?
*December 18, 2010 by George*

**physics**

Solid and hollow cylinders both roll from rest down an inclined plane. Explain the difference in speeds at the bottom.
*March 8, 2011 by Nazgul*

**Physics II**

Find the work done in pulling a 120 gram box in an incline plane, 150 cm long and 90 cm high if the coefficient of friction is 0.25.
*August 25, 2011 by Marie*

**Physics**

An airplane with an airspeed of 33.3 m/s is headed 30 degrees east of north in a wind blowing due west at 30 m/s. What is the ground speed of the plane?
*November 13, 2011 by Anonymous*

**physics**

a gymnast tumbles forward 4.0m does cartwheels to the left for 6.0 m and climb a vertical rope to a height of 3.0m. What is the magnitude of the plane's displacement from the airport?
*November 17, 2011 by Zady*

**Chem**

how can the concept of specific heat capacity of water be used to explain the heating and cooling patterns of oceans and climate on the plane?
*January 22, 2012 by Skye*

**calculus**

Use the shell method to find the volume of the solid generated by revolving the plane region about the line x = 9. y = 7x − x2 y = 0
*January 24, 2012 by DER23849*

**algebra **

a plane covered a horizontal distance of 15 miles while following a flight path with a slope of .25. how much altitude did it gain?
*February 12, 2013 by lexington*

**Physics**

Moment of inertia of a 'non-uniform' ring of mass M and radius R about axis through centre and normal to its plane is
*April 24, 2013 by Clandestine*

**chemistry**

Calculate the surface energy of the (100) plane of niobium. The heat of atomization is 745 kJ/mol. Express your answer in J/cm2.
*May 31, 2013 by Anonymous*

**chemistry**

Calculate the surface energy of the (100) plane of niobium. The heat of atomization is 745 kJ/mol. Express your answer in J/cm2.
*June 1, 2013 by nonu*

**chemistry**

Calculate the surface energy of the (100) plane of niobium. The heat of atomization is 745 kJ/mol. Express your answer in J/cm2.
*June 2, 2013 by Anonymous*

**chemistry**

Calculate the surface energy of the (100) plane of niobium. The heat of atomization is 745 kJ/mol. Express your answer in J/cm2
*June 3, 2013 by kl*

**chemistry**

Calculate the surface energy of the (100) plane of niobium. The heat of atomization is 745 kJ/mol. Express your answer in J/cm2
*June 3, 2013 by anny*

**science**

what is the minimum vertical length of a plane mirror needed for a person to be able to see a complete hesd to toe image?
*February 10, 2014 by jssel*

**physics **

for the uniform T shaped structure with mass 3M moment of inertia about an axis normal to the plane & passing through O would be
*October 13, 2014 by MOI*

**math**

what are the coordinates of the shadow cast on the xy plane by a small object placed at the point (10,7,20) assuming that the sun's rays are parallel to the vector (5,3,-2)
*January 31, 2015 by annie*

**Physics**

Calculate the components parallel and perpendicular to the plane of 150N gravitational force acting on an object on a slope at 20 degrees to the horizontal ?
*February 15, 2015 by Tatum*

**calculus**

Find the area under one arch of curve y=cos(x/4). This lesson is plane areas in rectangular coordinates. I don't know how to solve it. Thanks for your help.
*April 7, 2015 by Jhun*

**Physics**

An amusement park ride consists of a rotating circular platform 8.26 m in diameter from which 10 kg seats are suspended at the end of 1.14 m massless chains. When the system rotates, the chains make an angle of 16.2 degrees with the vertical. The acceleration of gravity is 9.8...
*November 15, 2009 by bubba*

**PHYSICS!!**

An amusement park ride consists of a rotating circular platform 8.26 m in diameter from which 10 kg seats are suspended at the end of 1.14 m massless chains. When the system rotates, the chains make an angle of 16.2 degrees with the vertical. The acceleration of gravity is 9.8...
*November 16, 2009 by bubba*

**physics**

The system in the Figure is in equilibrium. A mass M1 = 242.0 kg hangs from the end of a uniform strut which is held at an angle theta = 41.0o with respect to the horizontal. The cable supporting the strut is at angle alpha = 27.0o with respect to the horizontal. The strut has...
*April 10, 2012 by James*

**Physics**

A block is resting at the top of a rough incline with coefficients of kinetic and static friction of 0.25 and 0.45 respectively. The angle of the incline is gradually increased until the block begins to slip. Calculate the angle that the block begins to slip.
*October 27, 2012 by Carol*

**Pre-Cal**

Angles of elevation to an airplane are measured from the top and the base of a building that is 40 m tall. The angle from the top of the building is 37°, and the angle from the base of the building is 40°. Find the altitude of the airplane. (Round your answer to two decimal ...
*November 28, 2012 by Kendall*

**Geometry**

The measure of an exterior angle of a triangle is 120. the interior angles that are not adjacent to this exterior angle are congruent. find the measures of the interior angles of the triangle
*March 18, 2010 by Anonymous*

**Calculus **

A force of 70 N acts at an angle of 40 degrees to the horizontal and a force of 125 N acts at an angle of 65 degrees to the horizontal. Calculate the magnitude and direction of the resultant and the equilibrant.
*May 25, 2010 by Anonymous*

**physics**

The components of vector A are Ax and Ay (both positive), and the angle that it makes with respect to the positive x axis is θ. Find the angle θ if the components of the displacement vector A are (a) Ax = 11 m and Ay = 11 m, (b) Ax = 19 m and Ay = 11 m, and (c) Ax = ...
*January 30, 2011 by thaokieu*

**trigonometry**

a man measured the angle of elevation of the top of a tower to be 70 degree. When he walked 300 m. further, the angle of elevation of the top was 35 degree. What is the height of the tower?
*July 12, 2011 by eekim*

**Math**

Prove: If the hypotenuse and an acute angle of one triangle are congruent respectively to the hypotenuse and an acute angle of another right triangle, then the two triangles are congruent.
*March 26, 2013 by Barb *

**Trigonometry**

The shadow of an electric pole is 5 m. long when thr angle of elevation of the seen is 60 degrees. Find the length of the shadow when the angle of elevation of the seen is 45 degrees
*February 8, 2015 by Res*

**math**

The shadow of an electric pole is 5 m. long when thr angle of elevation of the seen is 60 degrees. Find the length of the shadow when the angle of elevation of the seen is 45 degrees
*February 11, 2015 by Anonymous*

**Science**

Q12: A light ray is travelling from a medium with a larger index of refraction to a medium with a smaller index of refraction. Describe what happens as the angle of incidence gets larger and larger. Include the concept of the critical angle in your discussion.
*October 2, 2012 by Anonymous*

**Math**

Please let me know if I am right on these. Mystery #1. 1. The mystery shape has fewer than 3 lines of symmetry. 2. It has at least 1 pair of perpendicular sides. 3. It has at least 1 pair of parallel sides. 4. It has less than 1 obtuse angle. This is what I came up with for ...
*March 26, 2011 by Rayna*

**physics**

A particle undergoes two displaments , measured from the positive x-axis, with counterclockwise positive.The first has a magnitude of 11 m and makes an angle of 88 with the positive x-axis. The resultant displacement has a magnitude of 6.8 m direceted at an angle of 115 from ...
*August 7, 2014 by Anonymous*

**algebra**

How do I convert the following polar expression to rectangular form? 3 sec (beta) r= ---------------- 4 sec (beta) + 4 [If not clear, the equation is r equals 3 times secant of angle beta divided by 4 times the sec of angle beta plus 4.]
*January 20, 2010 by Priscilla*

**physics**

A certain wave is incident on an interface at an angle of 40 deg. The wave emerges into the other material at an angle of 30 deg. Crossing the interface, the wave: a. increased speed b. reduced speed c. maintained constant
*November 12, 2010 by Sonya*

**CALCULUS ONE!**

The graph of sinx and cosx intersect once between 0 and pi/2. What is the angle between the two curves at the point where they intersect? (You need to think about how the angle between two curves should be defined).
*October 18, 2011 by Sara*

**phys**

Mike throws a ball upward & toward the east at a 20.0 angle with a speed of 51.0 . Nancy drives east past Mike at 15.0 at the instant he releases the ball. What is the ball's initial angle in Nancy's reference frame?
*May 29, 2012 by keren*

**trig**

angles of elevation to an airplane are measured from the top and the base of a building that is 40 m tall. The angle from the top of the building is 31°, and the angle from the base of the building is 40°. Find the altitude of the airplane. (Round your answer to two decimal ...
*November 28, 2012 by Barb*

**Trig**

A weather balloon is sighted between points A and B which are 5 miles apart on level ground. The angle of elevation of the balloon from A is 37 degrees and it's angle of elevation from B is 58 degrees. Find the height, in feet, of the balloon above the ground.
*March 5, 2014 by Nairb*

**physics**

A 1 kg steel ball strikes a wall with a speed of 9.99 m/s at an angle of 55.1 ◦ with the normal to the wall. It bounces off with the same speed and angle. If the ball is in contact with the wall for 0.292 s, what is the magnitude of the average force exerted on the ball ...
*October 7, 2008 by Anonymous*

**physics**

A 1 kg steel ball strikes a wall with a speed of 9.99 m/s at an angle of 55.1 ◦ with the normal to the wall. It bounces off with the same speed and angle. If the ball is in contact with the wall for 0.292 s, what is the magnitude of the average force exerted on the ball ...
*October 7, 2008 by Anonymous*

**Physics**

A 45 kg crate is placed on an inclined ramp. When the angle the ramp makes with the horizontal is increased to 29 degrees, the crate begins to slide downward. What is the coefficient of static friction between the crate and the ramp? At what angle does the crate begin to slide...
*February 22, 2010 by Grace*

**phy**

A 45 kg crate is placed on an inclined ramp. When the angle the ramp makes with the horizontal is increased to 22 deg , the crate begins to slide downward. 1-What is the coefficient of static friction between the crate and the ramp? 2-At what angle does the crate begin to ...
*July 18, 2011 by poul*

**Math (Pre-Calc)**

An airplane is flying east at a constant altitude of 28,000 meters. When first seen to the east of an observer, the angle of elevation to the airplane is 71.5 degrees. After 73 seconds, the angle of elevation is 51.6 degrees. Find the speed of the airplane.
*April 7, 2012 by Tina*

**physics**

A particle undergoes two displacements. The first has a magnitude of 160 cm and makes an angle of 105.0° with the positive x axis. The resultant displacement has a magnitude of 140 cm and is directed at an angle of 35.0° to the positive x axis. Find the magnitude and direction...
*September 13, 2012 by neeba*

**Math**

Which statement(s) is/are true?Select one of the options below as your answer:A. A 25° angle is congruent to a 25° angle.B. Two intersecting lines form two pairs of congruent angles.C. It is possible for congruent angles to add up to 90°.D. All of the above are true.
*July 24, 2013 by DD*

**trigonometry pls help**

Howard is flying a kite and wants to find its angle of elevation. The string on the kite is 32 meters long and the kite is level with the top of a building that he knows is 28 meters high. To the nearest tenth of a degree, find the angle of elevation. Show your work.
*April 25, 2015 by allexelle*

**algebra**

Hi can I get help with these two questions. 1. Everytime the pedals go through 360 degree rotation, the tires roate three imes. if the tires are 24 nches in diameter, what is the minimum numbe of comlete rotions of the pedls needed forr the bicycle to travel at least 1 mile. I...
*March 16, 2008 by Evan*

**Physics**

please check these answers for me When an object is moving with uniform circular motion, the centripetal acceleration of the object a. is circular b. is perpendicular to the plane of motion c. is zero d. is directed toward the center of motion D What is the term for the net ...
*February 15, 2009 by teamjakeward*

**physics**

A wood block, after being given a starting push, slides down a wood ramp at a constant speed. What is the angle of the ramp above horizontal? The fact that there aren't any numbers involved here and a certain angle is required confuses me. I know it involves Newton's second ...
*September 13, 2010 by Alura*

**geometry**

How would the triangle look if angle Q is congruent to angle T and line segment PQ is congruent to line segment ST?
*December 14, 2010 by Anonymous*

**math**

Verify that the circles x2+y2 = 25 and (x−5)2+(y−10)2 = 50 intersect at A = (4, 3). Find the size of the acute angle formed at A by the intersecting circles. You will first have to decide what is meant by the phrase the angle formed by the intersecting circles.
*April 25, 2010 by Ella*

**Vectors**

E and C kick a soccer ball at the same time. E kicks it with a force of 120 N at an angle of 60 degrees and C kicks it with a force of 200 N at an angle of 120 degrees. Calculate The magnitude and direction of the resultant force.
*May 8, 2010 by Bobby*

**geometry**

Find the value of x in each right triangle. A.) short leg= 8 hyp= x and one angle equals 42 B.) short leg= 12 long leg= x and one angle equals 67 please help!!! i have a final tomorrow
*June 2, 2010 by monique n*

**Trigonometry**

the leaning tower of pisa is 179 ft tall. it leans at an angle of 5.5 degrees. if the angle of elevation of the sun is 60 degrees and the sun is opposite the side on which the tower leans, how long is the shadow that the tower will cast?
*August 30, 2011 by marvin*

**Physical Education 8A**

Will someone please check my answers? I starred my answers. 1. A person who does not recognize the signs of mental illness may not know he needs help. A. True* B. False 2. Which of the following is not a sign of psychotherapy? A. insight B. cognitive* C. medications D. group 3...
*November 4, 2014 by Please Check Answers*

**physics**

To make a bounce pass, a player throws a 0.60-kg basketball toward the floor. The ball hits the floor with a speed of 5.5 m/s at an angle of 72° from the vertical. If the ball rebounds with the same speed and angle, what was the impulse delivered to it by the floor? what ...
*October 19, 2011 by !!!!*

**physics**

can some one help me with coming with a better way to word theses annswers. As the angle increases, what happens to the tension in the string? *the the tension in the string will get tighter or larger for t1 What would you have to do to the angle to make the tension in the ...
*October 20, 2010 by Derek*

**physics**

can some one help me with coming with a better way to word theses annswers. As the angle increases, what happens to the tension in the string? *the the tension in the string will get tighter or larger for t1 What would you have to do to the angle to make the tension in the ...
*October 20, 2010 by derek*

**trig**

A submersible traveling at a depth of 250 feet dives at an angle of 15 degrees with respect to a line parallel to the water's surface. It travels a horizontal distance of 1500 feet during the dive. What is the depth of the submersile after the dive?Explain how the angle of the...
*April 15, 2012 by Sara*

**johnny**

A projectile is launched over level ground at a launch angle of 70o with an initial velocity vo. At some later time while the projectile is on its way to the peak in its trajectory, its velocity vector makes an angle of 50o with respect to the horizontal. What is the magnitude...
*July 29, 2013 by franko*

**physics**

A projectile is launched over level ground at a launch angle of 70o with an initial velocity vo. At some later time while the projectile is on its way to the peak in its trajectory, its velocity vector makes an angle of 50o with respect to the horizontal. What is the magnitude...
*July 29, 2013 by billo*

**Physics**

1)A beam of light passes from air to ethanol, with index of refracton of 1.36. If the angle of incidence ( 1)is 30.0 d/C, then calculate the angle of refraction, after light passes through ethanol and enters into air. sin-1((1.0003/1.36)sin30.0 21.6 d/C 2)An ____ lens is used ...
*April 8, 2008 by Jon*

**Physics**

What is the kinetic energy of an ideal projectile of mass 19.4 kg at the apex (highest point) of its trajectory, if it was launched with an initial speed of 29.2 m/s and at an initial angle of 46.9° with respect to the horizontal? I know kinetic energy equals half of mass ...
*October 21, 2014 by Anonymous*

**physics**

Three vectors, expressed in Cartesian coordinates. What is the angle of the resultant vector S, T, U measured from the positive x axis? x-comp y-comp S -3.5 +4.5 T 0 -6.5 U +5.5 -2.5 To find the resultant, i'm assuming I have to add the columns up. If that's the case I got x-...
*February 3, 2015 by heylo*

**math**

john is standing 100 metres away from a building.the angle of elevationto the top of the building is8 degrees .He now walks straight away from the building.When he stopes,the angle of elevation is only 1 degree and 48 seconds.How far away is now from the base of the building.
*September 26, 2011 by Pauline Duma *

**math**

john is standing 100 metres away from a building.the angle of elevationto the top of the building is8 degrees .He now walks straight away from the building.When he stopes,the angle of elevation is only 1 degree and 48 seconds.How far away is now from the base of the building.
*September 26, 2011 by Pauline Duma *

**Physics**

A 2 kg steel ball strikes a wall with a speed of 8.15 m/s at an angle of 54.4◦ with the normal to the wall. It bounces off with the same speed and angle, as shown in the figure. If the ball is in contact with the wall for 0.243 s, what is the magnitude of the average ...
*November 2, 2011 by Seth*

**Physics**

For a piece of glass n(red)= 1.635 and n(blue)= 1.689. The respective wavelengths are 680nm (red) and 430nm (blue). Find the angle between these two colors of light in the glass if they were originally in a white light beam in air incident on the glass at an angle of 44.
*March 24, 2012 by chi*

**physics**

Consider the motion of the hour hand of a clock. What angle does the hour hand make with respect to the vertical 12 o'clock position when it is at the times below? Express each angle in both degrees and radians, and measure angles going clockwise from the vertical axis. 5 o ...
*June 14, 2012 by lizz*