Friday

December 19, 2014

December 19, 2014

Number of results: 17,023

**physics**

One student is pushing on a chair with a force of 260.6 N directed at an angle of 30 degrees above horizontal while a second student pushes on the same side of the chair with a force of 21.0 N at an angle of 15 degrees below horizontal. What is the magnitude, in N, of the sum ...
*October 1, 2009 by tracy*

**calculus**

A rocket rises vertically from a point on the ground that is 100m from an observer at ground level. The observer notes that the angle of elevation is increasing at a rate of 12∘per second when the angle of elevation is 60∘. Find the speed of the rocket at that ...
*September 29, 2010 by ibo*

**geometry**

Wendy drew line segment LM. She used a compass and straightedge and constructed a bisector on segment LM that crosses it at O. Which other construction uses the same steps as the ones Wendy took? A:an angle bisector B:a congruent angle C:a pair of parallel lines D:a pair of ...
*September 22, 2011 by Anonymous*

**PHYYYYYSICS 10**

A baseball is thrown horizontally off a 41-m high cliff with a speed of 18 m/s. What will be the angle in degrees between the horizontal direction and the velocity vector of the baseball just before it hits the ground? Assume that the answer will be positive and also will be ...
*September 18, 2014 by Carissa*

**math**

the measure of angle a is (3x + 10) degrees. The measure of angle d is (x + 10) degrees. What is the value of x?
*April 21, 2008 by wilma*

**math**

measure of angle 1 equals 3x and measure of angle 3 equals (7x-40)...... i dont get this
*March 15, 2012 by Anonymous*

**Geometry**

If angle ABD is 79 what is angle ABC and DBC DBC (5x+4) ABC (8x-3)?
*August 28, 2013 by Darko*

**trigonometry**

in triangle abc, angle c is a right angle, AC=8,Bc=15 and AB=17 a.find Sine a b.Find cosine A c.Find Sine B d. Find COsine B E. the measure of angel A f. the measure of angela b Can u tell me the answers and how to do it. Because im in 8th grade
*May 18, 2010 by james*

**follow up to psychology answer**

You answered this question with some helpful information but after reading what u put would the answer be how personality develops across the lifespan then? Developmental psychologists study all of the following EXCEPT: -What part of the brain is involved in the development of...
*November 19, 2008 by Michele*

**Socials**

for the question like 2 days ago. About world war I and World war 2 announcement. I think I may be wrong because people were happy to go to ww1 they thought it be fun and easy money but ww2 they had to go no choice. they need to step out of depression only way to make money, ...
*November 14, 2011 by Mohammad*

**Physics**

HELP PLEASE. Hypothetically, you are standing on the balcony of an apartment on the 10th level of a building and you throw a ball at some angle, 0 , above the horizontal away from the building. the ball lands on the ground 10m from the building, 3.2s after it was thrown. the ...
*April 26, 2012 by Melissa*

**science**

A small mass m swings in a horizontal circle of radius r at the end of a string of length Li and negligible mass, which makes an angle i with the vertical. The string is slowly shortened (for example by pulling it through a hole in its support) until the final length is Lf ...
*November 26, 2013 by Hasibul*

**physics**

A small mass m swings in a horizontal circle of radius r at the end of a string of length Li and negligible mass, which makes an angle i with the vertical. The string is slowly shortened (for example by pulling it through a hole in its support) until the final length is Lf ...
*November 26, 2013 by Anonymous*

**MATH**

How can you factor x^4 +1? If you go to the imaginary plane, it factors to (x^2 + i)(x^2-i) I need to factor by difference of squares. How can I do this?
*March 25, 2007 by Mike*

**Trigonometry**

Find a vector perpendicular to the plane containing the points (0,1,2), (-2,2,4), and (-1,-1,-1) step by step
*March 5, 2008 by Anonymous*

**math**

A vertical line is all rise. If there is no y value then how does this become a line in the x-y plane?
*May 10, 2009 by marie*

**math**

Determine the region(s) of the Cartesian plane for which a) y > 1/(x^2) b) y less than or equal to x^2 +4 and y greater than or equal to 1/(x^2 +4)
*October 25, 2009 by Anonymous*

**health**

when would a Midsagittal plane be used. i know it is, but what type of xray would be taken
*June 12, 2010 by Tonni*

**calculus**

Find a vector perpendicular to the plane that contains the points A(1,2,3), B(3,2,1), and C(-1,2,-3) Where do I start to find it?
*June 17, 2010 by Jake*

**geometry**

Math - Plane Geometry. BC is a diameter of circle O, and radius OE is parallel to chord CD. Help?
*May 23, 2011 by Brianna*

**Math**

Find a formula for a transformation of the complex plane that carries the disk {z: |z-5| < 3} to the disk {z: |z-2| < 8}
*September 30, 2011 by Joey*

**physics**

Which of these two is faster-a plane traveling at 250km/hr and a cat running at 250km/hr
*December 20, 2011 by Lekan*

**physics **

A plane traveling at 260m/s has a speed of Match 0.80. What is the speed of sound in the air
*June 6, 2012 by Melissa*

**Calculus**

A 12' ladder is leaning against a wall making an angle theta with the ground. The ladder begins to slide down the wall. what is the rate of change of the height of the ladder, h, with respect to the change in the angle of the ladder with the floor when the ladder reaches a ...
*November 16, 2012 by Anonymous*

**physics**

A laser beam enters a .125 m thick glass window at an angle of 39° (from the normal). The index of refraction of the glass is 1.46. At what angle from the normal does the beam travel through the glass? that answer is 25.53 deg the second part asks How long does it take the ...
*May 24, 2008 by help?*

**physics**

A laser beam enters a .125 m thick glass window at an angle of 39° (from the normal). The index of refraction of the glass is 1.46. At what angle from the normal does the beam travel through the glass? that answer is 25.53 deg the second part asks How long does it take the ...
*May 25, 2008 by help?*

**Osciallations**

You pull a simple pendulum of length 0.237m to the side through an angle of 3.50 degrees and release it. How much time does it take the pendulum bob to reach its highest speed? Take free fall acceleration to be = 9.80 . How much time does it take if the pendulum is released at...
*April 15, 2010 by abby*

**college physics**

A cruise ship of seniors is moving due west with an engine speed of 60km/hr when it encounters a current from the North at 20Km/hr. What is its relative velocity due to this current? (speed and angle) What course correction does it need to continue due west? (new angle and ...
*October 30, 2012 by Gee*

**Astronomy - Physics**

Finally, we will look at a system that is in an orbit comparable to the Earth to see how the angle that the light strikes the surface and the length of day contribute to the total amount of energy that we receive from the Sun at the two solstices. Recall that the changing ...
*March 9, 2013 by Amy*

**chemistry**

1) The color of bromocresol green indicator is??? when pH < 4, green when pH 4- 5.3 and ???? in pH > 5.3. 2)(A) A student performed the freezing point depression experiment according to directions but mistakenly recorded the mass of lauric acid as 8.300 g instead of 8....
*April 5, 2008 by chris*

**Inverse trigonometric functions**

How to find the value of arctan(2 sin (pi/3)) without using calculator or sketching a triangle. It is like taking u=something and then evaluating. Thanks. the solution relies on the fact that you should know the ratio of sides of the 30,60 90 degree triangle, and knowing that ...
*April 9, 2007 by Jen*

**physics **

a ufo is trying to escape by flying at the constant velocity of 70m/s at an upward angle of 2 degrees. it passes directly over you at a height of 40 m. at the instant it is directly above you you attempt to shoot it down by launching a projectile. what is the lowest launch ...
*September 19, 2013 by mary*

**GEOMETRY**

About how many rectangles will fit about a point when tessellating the plane?
*August 25, 2009 by ggift*

**VECTORS **

Write a scalar equation of each plane, given its vector equation. [x,y,z] = [3,7,-5] + s[1,2,-1] + t[1,-2,3]
*June 5, 2010 by Abigail *

**Vectors**

The point P(-1,0,1) is reflected in plane y-z=0 and has P' as its image. Determine the coordinated of point P'
*June 20, 2010 by Lala*

**Physics need help**

Find the unit vector perpendicular for the vector i+2j-4k in the xy-plane.
*November 16, 2011 by Lorry*

**Calculus and vectors**

Do the vectors (2,0,1),(-2,0,0) and (2,3,0) lie on the same plane? Explain your reasoning.
*March 26, 2012 by Melinda*

**help me pls geometry**

Which tirangles must be similar 1. Two right triangles with a congruent acute angle 2. Two obtuse angles 3 Two isosceles triangles with congruent bases 4. Two scalene triangles with a congruent angle
*December 9, 2013 by alexis*

**physics**

A ray of light has an angle of incidence of 30.4 degrees on a block of quartz and an angle of refraction of 20.7 degrees. What is the index of refraction for this block of quartz?
*February 18, 2011 by Maria*

**Physics**

A ray of light has an angle of incidence of 30.4 degrees on a block of quartz and an angle of refraction of 20.7 degrees. What is the index of refraction for this block of quartz?
*February 24, 2011 by Maria*

**physics**

consider a massless cord attached at both ends to hooks in a ceiling. A 20 kg mass is then suspended from the first cord by a second cors. The angles made by the cord with the ceiling are 40 degrees (left angle) and 25 degrees (right angle). Find the tension in each cord. I ...
*November 20, 2006 by randy*

**physics**

You are riding on a jet ski directed at an angle upstream on a river flowing with a speed of 2.8 m/s. If your velocity relative to the ground is 8.0 m/s at an angle of 30.5° upstream, what is the speed of the jet ski relative to the water? I thought I should just use ...
*September 10, 2014 by Nikki*

**integral**

the region in the x-y plane bounded by the y=x^2, the line x=0 and the line x=5 and the x-axis. find the volume generated
*August 7, 2009 by matrix school 2*

**math**

a point has coordinates(0,3) where is it located in the coordinate plane A)x-axis B)y-axis C)quadrant3 D)quadrant4
*January 17, 2010 by makeeda*

**math**

a point has coorindate (-3,0) where is it located in the coordinate plane? A)x-axis B)y-axis C)quadrant 1 d)quadrant4
*January 17, 2010 by makeeda*

**math**

a point has coordinates(-3,-3) where is it located in the coordinate plane? A)x-axis B)y-axis c)quadrant2 d)quadrant3
*January 17, 2010 by makeeda*

**math**

a point has coordinates(0,0) where is located in the coordinate plane? A)x-axis B)orgin C)y-axis D)quadrant1
*January 17, 2010 by makeeda*

**geometry**

In a coordinate plane how many points are both 5 units from yhe origin and 2 units from the x-axis
*May 16, 2010 by a*

**algebra **

Describe what are the graphs of the intervals [-4,10], (-4, 10], [-4, 10) and (-4, 10) looks like. Are these graphs in the xy-plane or on the number line?
*January 11, 2011 by wendi *

**Precalculus **

1. Simplify the expression ((5x^-2)/(4x^2))^-2 2. (x)/(x^2-81)-(9)/(81-x^2) = 3. Let (-3,3) and (-6,_2) be points in the Cartesian plane. Find the distance between the points.
*January 23, 2011 by Amy*

**trig**

The parametric equations for a curve in the x-y plane are x=2+t^2 and y=4-3t. Determine the points where the curve intersects the x-axis.
*April 19, 2011 by casey*

**science**

if a plane drops a bomb, does the bomb fall straight down, or behind or forward?
*May 18, 2011 by janet*

**math**

In the xy-coordinate plane, the distznce between point B(15,7) and point A(x,15) is 17. What is one possible value of x?
*January 19, 2013 by Ana*

**physics**

If you run away from a plane mirror at 2.35m/s , at what speed does your image move away from you?
*June 6, 2013 by Avantika*

**Calculus**

Find the point at which the line intersects the given plane. x = 4 − t, y = 5 + t, z = 2t; x − y + 3z = 3 (x, y, z) =____________?
*January 31, 2014 by bilal*

**Calculus**

Find the point at which the line intersects the given plane. x = 1 + 4t, y = 4t, z = 2−3t ; x + 2y − z + 1 = 0 (x, y, z) = _____________?
*January 31, 2014 by balal*

**dynamics**

example of every types of motion *translation *rotation *general plane motion
*September 8, 2014 by aira*

**calculus**

Find the point on the plane z = 6x + 9y + 1 closest to the point P = (1, 0, 0). Hint: Minimize the square of the distance. (x, y, z) =
*October 16, 2014 by Anonymous*

**Physics**

A ray of light of frequency 5.09 x 10^14 Hz passes from air into flint glass (n=1.6). a.) If the ray enters the flint glass at an angle of 30*, what is the angle of refraction? b.) What is the critical angle for a ray of light traveling from flint glass to air? c.) What is the...
*June 12, 2006 by Nathaniel*

**Physics Classical Mechanics**

A railroad gun of mass M = 2.0 kg fires a shell of mass m=1.0 kg at an angle of θ= 40.0 ∘ with respect to the horizontal as measured relative to the gun. After the firing is complete, the final speed of the projectile relative to the gun (muzzle velocity) is v0=110....
*October 28, 2013 by Anonymous*

**physics**

A car of weight W = 12.3 kN makes a turn on a track that is banked at an angle of θ = 20.9°. Inside the car, hanging from a short string tied to the rear-view mirror, is an ornament. As the car turns, the ornament swings out at an angle of φ = 28.3° measured from the...
*August 1, 2012 by ayhan*

**EARTH SCIENCE**

1. Which gas is a source of natural groundwater pollution? A. Carbon B. Oxygen C. Hydrogen D. Radon D? 4. A stream channel is formed when water A. carves a very deep and wide channel into rock. B. carries minerals into the ocean. C. creates a depression, which forms a lake. D...
*January 8, 2014 by Beatrice*

**EARTH SCIENCE**

1. Which gas is a source of natural groundwater pollution? A. Carbon B. Oxygen C. Hydrogen D. Radon D? 2. A stream channel is formed when water A. carves a very deep and wide channel into rock. B. carries minerals into the ocean. C. creates a depression, which forms a lake. D...
*January 23, 2014 by Beatrice*

**Math **

A rocket shoots straight up from the launch-pad. Five seconds after lift-off, an observer 2 miles away notes that the rocket's angle of elevation is 3.5 degrees. Four seconds later the angle of elevation is 41 degrees. How far did the rocket rise during those 4 seconds.
*September 29, 2012 by Lianne*

**Geometry**

5. What theorem do Exercises 1-4 prove? (1 point) Triangle Inequality Theorem Converse of the Angle Bisector Theorem Angle Bisector Theorem Triangle Midsegment Theorem
*January 1, 2011 by Anonymous*

**physics**

a rifle that has been ‘sighted in' for a 91.4-meter target. If the muzzle speed of the bullet is v0 = 328 m/s, there are the two possible angles è1 and è2 between the rifle barrel and the horizontal such that the bullet will hit the target. One of these angles is so large that...
*February 10, 2011 by tish*

**Physics (please help!!)**

A suitcase of weight mg = 450 is being pulled by a small strap across a level floor. The coefficient of kinetic friction between the suitcase and the floor =0.640 a) Find the optimal angle of the strap above the horizontal. (The optimal angle minimizes the force necessary to ...
*February 18, 2011 by Catherine*

**Precalculus**

When a projectile leaves a starting point at an angle of elevation of theta with a velocity v, the horizontal distance it travels is determined by: d=v^2/(32) sin2theta Where d is measured in feet and v in feet per second. An outfielder throws the ball at a speed of 75 miles ...
*January 31, 2012 by jake*

**math**

how do we indicate the congruence at two triangles with two sides and the contained angle of the one equal two corresponding sides and the corresponding contained angle of the other ?
*April 17, 2008 by mota*

**physic**

A laser beam in air is incident on a liquid at an angle of 40.0^\circ with respect to the normal. The laser beam's angle in the liquid is 25.0^\circ.What is the liquid's index of refraction?
*January 28, 2010 by elina*

**psychology 220**

# 1.55 (1 pts.) Which of the following information led Dr. Tobin to conclude that Peter was suffering from bipolar disorder? A) the fact that he reported having intense bouts of anxiety B) the fact that he had recently been married and soon after was divorced C) the fact that...
*December 9, 2012 by G. KAY*

**Physics**

You are riding on a jet ski directed at an angle upstream on a river flowing with a speed of 2.8 m/s. If your velocity relative to the ground is 8.2 m/s at an angle of 25.0° upstream, what is the speed of the jet ski relative to the water?
*August 28, 2011 by Nikki*

**Trig**

A 60-foot flagpole stands on top of a building. From a point on the ground the angle of elevation to the top of the pole is 45 degrees and the angle of elevation to the bottom of the pole is 42 degrees. How high is the building?
*January 19, 2013 by Stephanie*

**math - trig**

1. Find csc A, cos A and tan A of an angle A whose terminal side contains (– 12, – 5). 2. Find sin X, sec X and cot X of an angle X whose terminal side contains (– 3, 5).
*June 11, 2013 by Annika*

**Math**

A wire to the top of a tower makes an angle of 52 with the le el ground. At a point 32 ft. Farther from the base of the toser and in líne with the base of the wire, the angle of elevation to the top of the toser is 21. What is the length of the tower.
*March 4, 2014 by Hannah*

**Statics**

If both the projection Pa and component Fb of the force F are 305 N, determine the magnitude F and the orientation è of the b-axis. There is a 70 degree angle from the negative y-axis to the a-axis. There is a 108 degree angle from the negative y-axis to the force.
*September 1, 2014 by Tim*

**math**

A vertical line is all rise. If there is no y value then how does this become a line in the x-y plane? can someone please help
*May 10, 2009 by angela*

**Math - Equations of planes**

Write a vector equation and scalar equation of the plane containing lines [x,y,z]= [-2,3,12]+s[-2,1,5] [x,y,z]= [1,-4,4]+t[-6,3,15]
*August 27, 2010 by Shaila*

**Vectors**

Given vectors A = -4.8i + 6.8j and B = 9.6i + 6.7j, determine the vector C that lies in the xy plane perpendicular to B and whose dot product with A is 20.0.
*September 28, 2010 by Victor*

**physics**

Im confused! How would you calculate the work done by a plane? I know work= f d, i just dont know how to get the force and distance!
*November 30, 2010 by Maddi*

**Pre-Calc**

I am seeking help with this problem Please...Thank you! Find the point on the line y=x+3 in the xy-plane that is closest to the point (3, 2)
*December 7, 2010 by Roy*

**physics**

Calculate the Mechanical Advantage for an incline plane that raises the load to 2.4 meters and has a length of 13.8 meters.
*December 13, 2011 by carlos*

**geometry**

The verticals of quadrilateral ABCD are given. Draw ABCD i'n a coordinate plane and show that it is a parallelogram
*January 11, 2012 by Hayle*

**Calculus**

Explain why the plane with Cartesian equation 2x+5z-3=0 never intersects the y-axis. Answer:Because there is no y-value in the equation?
*April 8, 2012 by Jenny*

**science physic**

If a ball rolls down an inclined plane and picks up 4 m/s each second it rolls, its acceleration is
*January 30, 2013 by denise*

**Calculus**

Find the equation of the tangent plane and symmetric equation for the normal line to the given surface at P: xy^2 + zy^2 + 4y -xz^2 = 18 P(-2,0,3)
*June 2, 2013 by Kim*

**Calculus**

Find the equation of the tangent plane and symmetric equation for the normal line to the given surface at P: xy^2 + zy^2 + 4y -xz^2 = 18 P(-2,0,3)
*June 2, 2013 by Elyse*

**english**

The plane came down later than expected. In this sentence ,what part of speech is the word down?
*January 17, 2014 by jackie*

**Math**

Find a scalar equation of the plane that contains the given point P=(-3,-3,1)and the given normal vector n = (-1,4,7)
*September 24, 2014 by Wiz*

**Algebra**

Find a scalar equation of the plane that contains the given point P=(-3,-3,1)and the given normal vector n = (-1,4,7)
*September 24, 2014 by Paul*

**Math**

Find a scalar equation of the plane that contains the given point P=(-3,-3,1)and the given normal vector n = (-1,4,7)
*September 24, 2014 by Aegon*

**math**

Find a scalar equation of the plane that contains the given point P=(-3,-3,1)and the given normal vector n = (-1,4,7)
*September 24, 2014 by Jon*

**math**

Find a scalar equation of the plane that contains the given point P=(-3,-3,1)and the given normal vector n = (-1,4,7.
*September 24, 2014 by Tech Nine*

**Math**

Find a scalar equation of the plane that contains the given point P=(-3,-3,1)and the given normal vector n = (-1,4,7)
*September 25, 2014 by Tech N9ne*

**Precalc**

Assume that points A(5, 10, 1), B(6, 3, 6), and C(12, 1, 4) are on a plane. Find vector AB and vector AC.
*January 7, 2012 by Grace*

**Precalc**

Assume that points A(5, 10, 1), B(6, 3, 6), and C(12, 1, 4) are on a plane. Find vector AB and vector AC.
*January 7, 2012 by Grace*

**math**

The diagram of airport runway intersections shows 2 parallel runways. A taxiway crosses both runways. If angle 8 measures 119, what is the sum of the measures of angle 1 and 4? a 122 b 238 c 119 d 299 I think the answer is b. Angles 1,4,5, and 8 are either alternate or ...
*November 23, 2007 by keisha*

**physics**

A coating of MgF2 (n = 1.38) is deposited on a glass plate (n = 1.50). Light is incident (from air) onto the plate at angle 60¡ã degrees from the normal to the surface. (Note that this is not nearnormal incidence and you will have to adjust the equations to allow for the angle...
*April 25, 2012 by Evangline*

**Science**

1) A block of mass 0.5 kg is placed at the highest point of a fixed smooth sphere of radius 0.5m. The block is gently pushed to one side. Calculate: 0 the 3 o (1) force exerted by the block on the sphere when it makes an angle with the vertical. (ii) At what angle does it ...
*May 10, 2012 by Vikas*

**Geometry**

One side of a triangle is x inches longer than another side. The ray bisecting the angle formed by these sides divides the opposite side into 3-inch and 5-inch segments. Find the perimeter of the triangle in terms of x. ( triangle angle bisector theorem) Let y be the small ...
*January 13, 2012 by Anonymous*

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