Tuesday

January 27, 2015

January 27, 2015

Number of results: 17,176

**physics**

A man pushing a mop across a floor causes the map to undergo two displacements. The first has a magnitude of 200 cm and makes an angle of 120° with the positive x axis. The resultant displacement has a magnitude of 240 cm and is directed at an angle of 60.0° to the positive x ...
*September 10, 2011 by grace*

**Physics**

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,è , above the horizontal away from the building. the ball lands on the ground 10m from the building, 3.2s after it was thrown. the height from ...
*April 26, 2012 by Rodney *

**physics**

Suppose that a shot putter can put a shot at the worldclass speed v0 = 14.00 m/s and at a height of 2.160 m. What horizontal distance would the shot travel if the launch angle θ0 is (a) 45.00° and (b) 42.00°? The answers indicate that the angle of 45°, which maximizes the...
*September 19, 2013 by kristy*

**physics**

A basket weighing 0.3kg is suspended from two ropes which are tied to a horizontal beam. The rope on the left is at an angle of 63° and the rope on the right is at an angle of 32° with respect to the beam. What mass of rocks could be placed in the bucket before the ropes break...
*January 30, 2014 by irvin*

**Geometry**

Which is the hypotenuse-angle theorem? ________________________________________ A. If the hypotenuse and an acute angle of a right triangle are congruent to the corresponding parts of another right triangle, then the triangles are congruent. B. If the hypotenuse and an obtuse ...
*June 30, 2010 by Superman*

**math**

A tower 125 feet high stands on the side of a hill. At a point 240 feet from the foot of the tower measured straight down the hill, the tower subtends an angle of 25 degrees. What angle does the side of the hill make with the horizontal?
*January 3, 2014 by math help*

**math**

A tower 125 feet high stands on the side of a hill. At a point 240 feet from the foot of the tower measured straight down the hill, the tower subtends an angle of 25 degrees. What angle does the side of the hill make with the horizontal?
*January 3, 2014 by math help*

**math**

A tower 125 feet high stands on the side of a hill. At a point 240 feet from the foot of the tower measured straight down the hill, the tower subtends an angle of 25 degrees. What angle does the side of the hill make with the horizontal?
*January 3, 2014 by math help*

**college physics**

Three identical balls are thrown from the top of a building, all with the same initial speed. The first is thrown horizontally, the second at some angle above the horizontal, and the third at some angle below the horizontal. Neglecting air resistance, rank the speeds of the ...
*October 5, 2010 by matt *

**Physics**

An alpine rescue team is using a slingshot to send an emergency medical packet to climbers stranded on a ledge. (height=252 m, horizontal distance=416 m, landing angle= 75° below the horizontal). What should be the launch speed from the slingshot? What is the launch angle? ...
*January 27, 2014 by Anonymous*

**Physics**

A baseball is thrown from the roof of 23.5m -tall building with an initial velocity of magnitude 10.0m/s and directed at an angle of 53.1∘ above the horizontal. a.What is the speed of the ball just before it strikes the ground? Use energy methods and ignore air ...
*May 9, 2014 by Anonymous*

**Physics**

Three children are fighting over a toy. One child pulls on the toy with a force of 100N at an angle of 37° north of east. The second child pulls on the toy with a force of 200N south. The third child pulls with a force of 250N at an angle of 20° south of west. Watching all of ...
*October 31, 2014 by Rose*

**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 I think reduces its speed, but I'm not sure.
*November 13, 2010 by Jarod*

**physics**

A book of mass 7 kg rests on a plank. You tilt one end of the plank and slowly increase the angle of the tilt. The coefficient of static friction between the book and the plank is 0.40. What is the maximum angle of tilt for which the book will remain stationary and not slide ...
*September 24, 2014 by jill*

**Physics**

Suppose the water near the top of Niagara Falls has a horizontal speed of 2.3 m/s just before it cascades over the edge of the falls. At what vertical distance below the edge does the velocity vector of the water point downward at a 55° angle below the horizontal? I'm not sure...
*April 2, 2008 by Hawkins*

**trig**

In a rignt angle base is 20 mtr,adjacent side is 6 mtr, hypotenus is 20.88 mtr, what is the degree of angle of hypotenus and base
*November 22, 2011 by Anonymous*

**trig**

In a rignt angle base is 20 mtr,adjacent side is 6 mtr, hypotenus is 20.88 mtr, what is the degree of angle of hypotenus and base
*November 22, 2011 by sanatan*

**Calculus and vectors**

|C|=5 and |D|=8. The angle formed by vectors C and D is 35 degrees, and the angle formed by vectors A and C is 40 degrees. Determine |B|. Could someone explain this question
*March 23, 2012 by Jake*

**Geometry**

Given: segment AB is congruent to segment BC; angle 1 is congruent to angle 2 Prove: triangle ABC is congruent to triangle DEC
*March 11, 2013 by Constance*

**trig**

An electric pole is supported to stand vertically on a level ground by a tight wire. The wire is pegged at a distance of 6 meters from the foot of the pole. The angle that the wire makes the ground is three times the angle it makes with the pole.
*May 27, 2012 by anonymous*

**Geometry**

The altitude to the hypotenuse of a right triangle ABC divides the hypotenuse into 12mm and 16mm segments. Find the lengths of each of the following. A. The altitude to the hypotenuse B. The shorter leg of angle ABC C. The longer leg of angle ABC
*September 30, 2013 by George*

**geometry**

An ant looks to the top of a bulding at an angle of elevation of 32°. The ant then walks an additional 66 feet from the edge of the building. If the new angle of elevation from the ant to the top of the building is 22°, find the height of the building. Round to the nearest tenth.
*January 17, 2014 by Lauren*

**Chemistry**

A popular brand of automobile radiator antifreeze advertises that their product (ethylene glycol; C2H6O2) provides engine protection from temperatures of -64C to 135C when mixed with water in a 50%/50% mix. What is the boiling point elevation and freezing point depression ...
*April 19, 2010 by Angelica*

**triganometry**

A landscape architect is designing a triangular garden to fit in the corner of a lot. The corner of the lot forms an angle of 50°, and the sides of the garden including this angle are to be 12 feet and 14 feet, respectively. Find, to the nearest integer, the number of square ...
*March 18, 2012 by Ayesha*

**statistics**

sample- a recent study reports that older adults who got regular physical exercise experienced fewer symptoms of depression, even when tested 2 years late. regular excersize scores= 1,3,4,3,5,2,3,4 no regular excersize scores=5,4,6,3,5,7,6,6 a)calculate the mean and the ...
*January 30, 2008 by Byron*

**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 25, 2014 by Beatrice*

**physic**

Find the acceleration reached by each of the two objects shown in figure below if the coefficient of kinetic friction between the 7.00 kg object and the plane is 0.270.
*October 16, 2009 by Chan*

**pre-calc**

Find a vector perpendicular to the plane containing the given points. (0,-2,2), (1,2,-3), and (4,0,-1) My teacher was unable to finish the lesson, but I'd like to know how to solve this problem.
*February 17, 2010 by James*

**physics**

An airplane whose airspeed is 295 km/h flies parallel to the direction of a wind with a speed of 40.0 km/h. What are the two possible speeds of the plane relative to the ground?
*September 28, 2010 by Anonymous*

**Science**

How would you set up the following unifor motion problem... How long will it take the plane to fly 1000 km (i mile=1.61 km) if it is traveling at a constant velocity of 80 km/hr.
*April 9, 2011 by Jack*

**physics**

during takeoff, an air plane goes from 0 to 360km/hr in 5s. A.) what is its acceleration? B.) How fast is it going after 5 s? C.) How far has it traveled by the time it reaches 50m/s?
*September 12, 2011 by Tara*

**calculus**

Use the shell method to set up and evaluate the integral that gives the volume of the solid generated by revolving the plane region about the y-axis. y = 6x y = 18 x = 0
*January 24, 2012 by MAM*

**maths**

write down the equation d^2u/dt^2=c^2 grad^2u in a plane polar coordinates .by the method of separation of variables , reduce the PDE to obtained to a set of ODE's
*February 11, 2012 by ashely*

**physics**

a circular wire loop of radius 5cm lies in the xy-plane in a magnetic field defined by B=-(4t^2+3t).determine the voltage across the resistor at time t=2s
*April 27, 2012 by musa*

**physics**

two objects of masses m1 and m2 fall freely from height h1 and h2 in a vertical plane respectively.The ratio of time taken by them is how much by reaching the ground?
*May 11, 2012 by snigdha*

**Physics**

An airplane flying at 82km/hr at 30 degrees east of north encounters a 40km/hr wind due west. What is the speed of the plane relative to the ground?
*June 12, 2012 by M*

**physics**

A 10 kg mass is sitting on a 25 degree incline. A constant force of 49N is applied up the plane. The coefficient of static friction is .25. Does it go up or down or does it stay put?
*February 19, 2013 by Aaron*

**Science**

A plane is flying 500mph east.The wind is blowing 50mph west.What is the netforce.Please help i need this question awensered by March 2013,31.
*March 27, 2013 by Cassidy*

**English**

Sort words by long vowels sound. 1date 2 fine 3 rose 4 lake 5 life 6home 7safe 8 rice 9 globe 10 plane
*September 10, 2013 by Mina *

**physic**

calculate the centripetal acceleration and the forcw acting on an aero plane of mass 1750Kg turning on a circle 430m radius at a velovity of 420m/s
*December 22, 2013 by nashath*

**physics**

an unpolarised light is incident on the boundary between two transparent media. State the contition when the reflected wave is totally plane polarised.
*March 3, 2014 by Tyler*

**PreCal**

An airplane has a ground speed of 523 mph and a component form of the velocity of <-482.781, -39.262>, due to wind. What is the bearing of the plane?
*July 21, 2014 by Janet*

**Physics - Damon**

Hey Damon, I posted this question a while back and you helped me figure out the first part of it. Assume that radio waves have a frequency of 6.0 × 10^7 Hz, and that the radio receiver is 25 m above the surface of the sea. What is the smallest angle theta above the horizon ...
*January 28, 2009 by Sam*

**Physics**

Two dogs pull horizontally on ropes attached to a post; the angle problem 1 between the ropes is 60.0 degrees. If dog A exerts a force of 270N and dog B exerts a force of 300N find the magnitude of the resultant force and the angle it makes with dog A's rope.
*June 8, 2009 by Sarah*

**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*

**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*

**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*

**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*

**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 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*

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