Thursday

July 2, 2015

July 2, 2015

Number of results: 60,819

**math**

How long is a ladder whose base is 3 ft from a wall and makes an 80° angle with the ground? Question 15 options: 10 ft 12 ft 14 ft 17 ft
*January 22, 2014 by josh*

**math**

thomas wants to build a seven layer brick wall. the bottom layer has 20 bricks and each layer of the wall that goes up has two less bricks than the layer below it. if each brick costs .50 cents to cement how money will Thomas spend on the wall ?
*April 6, 2010 by Alexander*

**algebra**

If John stands near a 30 foot tall tree and leans a 50 foot tall ladder against the tree that reaches to the top of tree, then how far is John standing away from the tree? (Round to the nearest hundredth)
*June 18, 2014 by Anonymous*

**Physics**

A uniform plank of length L leans against a vertical wall, its head a distance h above the horizontal ground. If we let go of the plank from rest, how far above the ground is the head of the plank the moment it loses contact with the wall?
*February 11, 2011 by OPTIPLEX*

**College Physics**

A uniform plank of length L leans against a vertical wall, its head a distance h above the horizontal ground. If we let go of the plank from rest, how far above the ground is the head of the plank the moment it loses contact with the wall?
*February 10, 2011 by Grimider*

**Math**

A fire ladder extends 18m. Each storey of a burning building is 10ft. If the ladder can have a maximum angle with the ground of 75 degrees, to what storey would the ladder reach?
*January 7, 2013 by Anonymous*

**phsyical science**

compare an atoms structure to a ladder. what parts of the ladder correspond to the energy levels of the atom/ identify one way a real ladder is not a good model for an atom.
*October 15, 2008 by taylor*

**geometry**

your neighbor is standing at the top of a 14 foot ladder. the base of the ladder is 4 feet from the house. how far off the ground is the neighbor
*February 18, 2013 by ashley*

**trig**

A 15 FOOT LADDER MAKES 52 DEGREES ANGLE WITH THE GROUND.HOW FAR WILL THE TOP OF THE LADDER BE ABOVE THE GROUND?
*October 19, 2012 by GLAIZY JEAN*

**English**

There is a shelf on the wall. He seems to use it as a bookshelf. On the shelf, there are two books. We can say he enjoys reading books. A basketball is on his uniform. We can see the top T-shirt and the bottom trunk. He seems to enjoy playing basketball. Write 'enjoy playing ...
*June 7, 2014 by rfvv*

**physics**

A train travels at 3m/s and parallel and very near to the train is a wall the has a slope of 12degrees, the window you see this wall through is .9m high, 2m across, and when you look out you first see the top edge at the lower left of the window, moving towards the top right ...
*August 29, 2012 by Liam*

**Math word problem**

A carpenter wants to put four shelves on an 8-foot wall so that the five spaces created decrease by 6 inches as we move up the wall. If the thickness of each shelf is 3/4 inch, how far will the bottom shelf be from the floor?
*September 21, 2011 by Megan*

**maths-Arithmetic progression**

A ladder has rungs 25 cm apart.The rungs decrease uniformly in length from 45 cm at the bottom to 25 cm at the top.If the top and the botom rungs are two nd a half metre apart, what is the length of the wood required for the rungs
*December 26, 2012 by Anonymous*

**physics**

A clear plastic tube with a diameter of 12cm and 110cm high is filled to the top with mercury. (density = 13.6 kg/m^3). There are three holes, all with a radius of 2 millimeters located 15cm from the bottom, 50cm from the bottom and 80cm from the bottom. A) What is the ...
*February 7, 2013 by dave*

**algebra**

There are two similar triangles. The angles are: from top to bottom left: DE, from bottom left to right: EF, And from Top to bottom right corner: DF. DE: 10.32 cm.EF: 8.88 cm.FD 12.24 cm. The angles are: D,top,45 Degrees. E, bottom left corner, 79 Degrees. And F, Bottom right ...
*December 12, 2011 by Logan*

**Physics and Math**

[a bullet weighing 50gm hits a 10cm wall with velocity 100ms-1 and comes out of the wall. If the frictional force on the bullet while in the wall is assumed to be a constant 2000N then with what velocity does the bullet come out of the wall?
*January 8, 2015 by Serah!*

**Physics and Math**

[a bullet weighing 50gm hits a 10cm wall with velocity 100ms-1 and comes out of the wall. If the frictional force on the bullet while in the wall is assumed to be a constant 2000N then with what velocity does the bullet come out of the wall?
*January 8, 2015 by Anna*

**physics please help**

A woman who weighs 4.33 X10^2 N is leaning against a smooth vertical wall, as the drawing shows. The height of the wall from her shoulder to her hand is .400m the angle at which she is laying on the wall is 50 degrees and the rest of the height at which she is leaning against ...
*November 28, 2010 by don*

**harapan bangsa school**

a 4-m plank rests against a wall 1.8m high so that 1.2m of it projects beyond the wall. find the angle the plank makes with wall.
*February 7, 2015 by clarissa*

**Physics**

You are holding a bulletin board weighing 6.46 N in place against a wall while your friend secures it to the wall. To keep it from slipping, you apply a force perpendicular to the bulletin board, pressing it directly into the wall. How large must this force be if the ...
*February 13, 2012 by Anonymous*

**Physics**

You are holding a bulletin board weighing 6.46 N in place against a wall while your friend secures it to the wall. To keep it from slipping, you apply a force perpendicular to the bulletin board, pressing it directly into the wall. How large must this force be if the ...
*February 13, 2012 by Mike*

**Physics**

You are holding a bulletin board weighing 7.01 N in place against a wall while your friend secures it to the wall. To keep it from slipping, you apply a force perpendicular to the bulletin board, pressing it directly into the wall. How large must this force be if the ...
*October 1, 2013 by Erica*

**Physics**

You are holding a bulletin board weighing 7.01 N in place against a wall while your friend secures it to the wall. To keep it from slipping, you apply a force perpendicular to the bulletin board, pressing it directly into the wall. How large must this force be if the ...
*October 2, 2013 by Erica*

**Math Help!!!**

Russell Grossman is training for the Olympics. He wants to know the distance across lake royal, so he can write in his training logbook how far he rows each day. If from one point on the shore to one side of the lake is 13 km and from the same point to another side of the lake...
*November 19, 2014 by Anonymous*

**Physics**

(I'll try to describe this the best I can, it's a little hard without showing a picture) This question deals with projectile motion: An archer is standing 150 meters above another archer 450 meters away [so visually the 150m and 450m make the right angle]. The archer at the ...
*September 27, 2009 by Nikki*

**Physics (repost)**

(I'll try to describe this the best I can, it's a little hard without showing a picture) This question deals with projectile motion: An archer is standing 150 meters above another archer 450 meters away [so visually the 150m and 450m make the right angle]. The archer at the ...
*September 27, 2009 by Nikki*

**Trigonometry**

a 30 feet ladder resting against a building makes a 60 angle with the ground . find the Height from the ground at which the ladder touches the building to the nearest foot
*March 5, 2012 by :)*

**help!!! physics**

you want to nail a 1.6 kg board onto the wall of a barn. to position the board before nailing, you push it against the wall with a horizontal force to keep it from sliding to the ground. (a) if the coefficient of static friction between the board and wall is .79, what is teh ...
*November 3, 2010 by stephanie*

**math**

a 20 foot ladder leaning against a building makes and angle of 60 degrees with the ground. How far from the base of the building is the foot of the ladder?
*May 1, 2011 by sara*

**Trig**

A 16 - foot ladder leaning against the side of a house reaches 12 feet up the side of the house. What angle does the ladder make with the ground
*September 23, 2012 by Bri*

**physics**

a 700 newton man is able to climb up 4.5 meters on a 6 meters ladder before it slips. What must be the coefficient of friction be if the ladder is arranged so that it makes an angle 50 degrees with the ground? Assume the ladder to be uniform and weighing 450 newtons.
*September 23, 2014 by james*

**Physics**

A governor (centrifugal pendulum) consists of two 200–g spheres attached by light, rigid 10.0–cm rods to a vertical rotating axle. The rods are hinged so that the spheres swing out from the axle as they rotate with it. However, when the angle θ is 45.0°, the spheres ...
*February 23, 2014 by Chrxeyshthoufov*

**math **

a ladder 17 feet long is leaned up against a house, reaching a height of 15 feet. how far from the house is the base of the ladder?
*June 5, 2014 by 1*

**physics**

A solid uniform 45.0 kg ball of diameter 32.0 cm is supported against a vertical frictionless wall using a thin 30 cm wire of negligible mass. (a) make a free body diagram for the ball and use it to find the tension in the wire and (b) how hard does the ball push against the ...
*June 11, 2010 by L*

**Math**

Martin is painting his house and needs to reach a point 9 feet above the ground. He places a 10.5-foot-long ladder against the house so that it forms an angle of with the ground. a. Describe the triangle that is formed by the ground, the house, and the ladder. Identify the ...
*May 29, 2013 by Tigerlilly*

**physics**

A girl of mass 60 kg throws a ball of mass 0.8 kg against a wall. The ball strikes the wall horizontally with a speed of 11 m/s, and it bounces back with this same speed. The ball is in contact with the wall 0.05 s. What is the average force exerted on the wall by the ball? A...
*June 24, 2009 by larry*

**Physics **

A girl of mass 55 kg throws a ball of mass 0.8 kg against a wall. The ball strikes the wall horizontally with a speed of 25 m/s, and it bounces back with the same speed. The ball is in contact with the wall 0.05 s. What is the average force exerted on the wall by the ball? A) ...
*March 30, 2012 by Alex*

**rpi**

For the stepladder shown in Fig. 12-51, sides AC and CE are each 3.34 m long and hinged at C. Bar BD is a tie-rod 0.662 m long, halfway up. A man weighing 746 N climbs 2.51 m along the ladder. Assuming that the floor is frictionless and neglecting the mass of the ladder, find...
*November 15, 2010 by Anonymous*

**physics**

need help quick: Magen's mass is 25 kg. She climbs the 4.5-m ladder of a slide, and reaches a velocity of 3.0 m/s at the bottom of the slide. How much work was done by friction on Magen?
*December 1, 2011 by Steve*

**Geometry**

Need to use a ladder to reach a window that is 8 meters above the ground. The base of the ladder will be 6 meters from base of the building. How long must the ladder be?
*August 28, 2012 by Des*

**Physics**

A spherical mooring buoy 36cm in diameter with a mass of 43 kg is fastened to a cleat on the top ofthe sea wall by a 50 cm long line, as shown. The force against the sea wall is a. 73N b.87N c. 104N d.116N e. None of these
*November 18, 2010 by Gerard*

**physics**

A brick wall with a thermal emissivity of 0.8 is heated by the sun all day and is at a temperature of 25 °C in early evening. A pedestrian walking past the wall feels its warmth radiating in to the cool evening air. The wall has surface area of 5m^2. What is the total out put ...
*January 3, 2012 by sand*

**calculus**

1. a large vertical rectangular plate of glass is to be inserted in the wall of an aquarium underwater so visitors can see into the tank fo fish. the glass is 10 feet high, 25 feet long and the top fo the glass is 3 feet below the top of the water. The pressure exerted by ...
*February 12, 2008 by student*

**calculus**

1. a large vertical rectangular plate of glass is to be inserted in the wall of an aquarium underwater so visitors can see into the tank fo fish. the glass is 10 feet high, 25 feet long and the top fo the glass is 3 feet below the top of the water. The pressure exerted by ...
*February 12, 2008 by student*

**Geometry**

The vertical slide ladder at the community swimming pool is 12.5 meters tall. The angle created by the top of the ladder and the top of the slide is 38°. Find the approximate length of the swimming pool slide to the nearest hundredth.
*March 1, 2012 by Makenzie*

**physics**

You want to nail a 1.5 kg board onto the wall of a barn. To position the board before nailing, you push it against the wall with a horizontal force F to keep it from sliding to the ground. (a) If the coefficient of static friction between the board and the wall is 0.71, what ...
*September 30, 2010 by cooper*

**Algebra 2 review**

how many feet from the base of a house must a 39-foot ladder be placed so that the top of the ladder will reach a point on the house 36 feet from the ground
*April 28, 2011 by Anonymous*

**math**

tilissa was on the middle rung of a ladder.she went up 3 rungs,thendown 5 rungs and then up 7 rungs where she rested.later she climbed up the remaining 7 rungs on the ladder.how many rungs did the ladder have?
*January 27, 2013 by francis*

**math**

A fireman stood in the middle of a step ladder. He climbed down 4 steps and continued his work. He went down 8 more then back up 9 to the top. How many steps were on the ladder?
*February 7, 2011 by Lauren*

**math**

The building is 16 by 12 feet so, to the nearest tenth of a foot what distance (x) fom the building should time place the 16-ft ladder so that the top of the ladder will be 12 feet above the ground?
*February 24, 2012 by Nicole*

**physics**

While trying to decide where to hang a framed picture, you press it against the wall to keep it from falling. The picture weights 9.5 N and you press against the frame with a force of 19 N at an angle of 30° from the vertical. What is the coefficient of static friction between...
*February 17, 2011 by mayrel*

**physics**

A 66 kg skier starts from rest at the top of a 1200 m long trail which drops a total of 180 m from top to bottom. At the bottom, the skier is moving 11.0 m/s. How much energy was dissipated by friction?
*June 18, 2012 by Kensey*

**College Algebra**

A ladder is 1 foot longer than its vertical heigt along the side of the house. The distance of the base of the ladder from the house is 7 feet less than its vertical height from the ground. How far up the house does the ladder reach?
*May 9, 2011 by Victoria*

**math**

a ladder is leaning againt the side of a building. The ladder is 10 feet away from the building and touches the building at a point 24 feet above the base. How long is the ladder?
*March 7, 2012 by mary ann*

**math,algebra,help**

can someone show me how to solve this: Simplify 3 --- + 1 x-5 ----------- 4 1 minus ---- x -5 that did n't look right...typo... here it is its a fraction on top of the other so the top is fine.the bottom should read one minus (4)/(x-5) Get least common denominator. For top ...
*March 13, 2007 by jasort20*

**math**

There is a slide in the park that is 18 feet long. The ladder to the top of the slide is 7.5 feet long. If the ladder and the slide are perpendicular, what is d, the distance from the top of the slide to the ground? If necessary, round to the nearest tenth
*February 19, 2015 by Olivia*

**Physics**

A ball moves at 33m/s through a wall of donuts 31 cm thick. It comesout of the donut wall at 18 m/s. How much time does it spend in the wall of donuts? How thick would the wall of dounts need to be to stop the ball entirely? Is the answer 1.3 secondsand the wall would need to ...
*January 10, 2009 by George*

**physics**

I recently did an experiment where I measured pressure at a few heights. The question I cam having trouble with is how to find the density of the air between the top and bottom. The difference in pressure from the top to bottom is 52.6 torr (692.5 to 745.1). The height of the ...
*May 13, 2010 by guillermo*

**math**

A 50 foot ladder is placed against a building so that it touches a point 40 feet above the ground. The distances ( in feet ) from the foot of the ladder to the building is a. 10 b. 20 c. 30 d. 45 e. 60 please answer and explain
*April 6, 2014 by thomas*

**physics**

1 - Determine the distance to which the 90 kg painter can climb without causing the 4 m ladder to slip at its lower end A as shown in Figure 1. The top of the 15 kg ladder has a smaller roller, and at the ground the coefficient of static friction is 0.25. The mass center of ...
*March 25, 2014 by zainab*

**physics**

Determine the distance to which the 90 kg painter can climb without causing the 4 m ladder to slip at its lower end A as shown in Figure 1. The top of the 15 kg ladder has a smaller roller, and at the ground the coefficient of static friction is 0.25. The mass center of the ...
*March 25, 2014 by zainab*

**math**

Determine the distance to which the 90 kg painter can climb without causing the 4 m ladder to slip at its lower end A as shown in Figure 1. The top of the 15 kg ladder has a smaller roller, and at the ground the coefficient of static friction is 0.25. The mass center of the ...
*April 30, 2014 by Anonymous*

**Physics(work and energy)**

A cannon ball is fired so that it hits the wall at the top of a 10m tower.If the energy needed to destroy the wall is 49000 F and the mass of the cannon ball is 10 k, the minimum initial velocity of the cannon ball required to break the tower wall is A 100 m/s b 200 m/s c 300 ...
*May 20, 2012 by TOM*

**geometry**

A 6-foot ladder touches the side of a building at a point 5 feet above the ground. At what height would a 15-foot ladder touch the building if it makes the same angle with the ground as the shorter ladder?
*January 14, 2010 by Angie*

**math**

There is a slide in the park that is 18 feet long. The ladder to the top of the slide is 7.5 feet long. If the ladder and the slide are perpendicular, what is "D", the distance from the top of the slide to the ground? Explain how you got your answer.
*March 10, 2013 by sara*

**MATH**

There is a slide in the park that is 18 feet long. The ladder to the top of the slide is 7.5 feet long. If the ladder and the slide are perpendicular, what is "D", the distance from the top of the slide to the ground? Explain how you got your answer.
*March 10, 2013 by SARA*

**Physics**

An attacker at the base of a castle wall 3.82 m high throws a rock straight up with speed 7.10 m/s from a height of 1.45 m above the ground. (a) Will the rock reach the top of the wall? __yes __no (b) If so, what is its speed at the top? If not, what initial speed must it have...
*September 8, 2012 by Emily*

**physics**

While trying to decide where to hang a framed picture, you press it against the wall to keep it from falling. The picture weighs 5.0 N and you press against the frame with a force of 6.0 N at an angle of 40 ° from the vertical. (a) What is the direction of the normal force ...
*March 15, 2012 by tharidu*

**calculus**

a fence 8 ft tall stands on level ground and runs parallel to a tall building. if the fence is 1 ft from the building, find the length of the shortest ladder that will extend from the ground over the fence to the wall of the building. (hint #1: if L represents the length of ...
*November 17, 2011 by robert*

**physics**

A 1290-N uniform beam is attached to a vertical wall at one end and is supported by a cable at the other end. A W = 1920-N crate hangs from the far end of the beam. the angle going from the top of the beam o the brick wall is at 50.0 degrees. the angle from the bottom of the ...
*March 4, 2011 by TaylorBaum*

**Calculus**

There is a sign that is 10ft on one side and 15ft on the other side (from the ground to the base of the sign), the billboard itself is 20ft. The painter brings a 25ft ladder in length. If the patch of ground 10ft from the base of the sign is used, at what point will the ladder...
*October 24, 2006 by Meagan*

**Math**

Another crazy one... 3sqrt5y^5 divided by 6sqrt20xy For this 3 square root 5y^5 ___________________ 6 square root 20xy you can reduce the 3/6 to 1/2 then you can go and split up the bottom denominator of square root 20 into square root of 5y * square root of 4x and cancel out ...
*August 21, 2007 by Sarah*

**Dwamena Akenten SHS**

A pole 25m long is placed against a vertical wall such that its lower end is 7m from the foot of the wall on the same horizontal ground. If the upper end of the pole is push down by 2m, calculate correct to 2 significant figure: 1) how much further away from the wall the lower...
*May 3, 2013 by Derrick*

**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*

**Statistics**

I'm stumped on this question. A teacher informs her history class that a test is very difficult, but the grades would be curved. Scores for the test are normally distributed with a mean of 25 and a standard deviation of 5. If the grades are curved according to the following ...
*March 15, 2011 by Norilyn*

**physics**

A 3.42-kg steel ball strikes a massive wall at 10.0 m/s at an angle of θ = 60.0° with the plane of the wall. It bounces off the wall with the same speed and angle. If the ball is in contact with the wall for 0.170 s, what is the average force exerted by the wall on the ...
*February 22, 2015 by alba*

**trig**

To guard against a fall, a ladder should make an angle of 75o or less with the ground. What is the maximum height that a 20-foot ladder can reach safely to the nearest tenth of a foot? in my diagram I set it up using the sin function since I want to find the height so I did (...
*June 2, 2014 by Anonymous*

**physics**

I'm just having trouble setting up this problem. It's based on a picture so I'll describe it: There is an open ladder standing on the floor with a person on the third step on one side. There is a crossbar attached to the two sides of the ladder and the floor is frictionless. I...
*December 1, 2010 by Meghan*

**physics**

A 3.56-kg steel ball strikes a massive wall at 10.0 m/s at an angle of θ = 60.0° with the plane of the wall. It bounces off the wall with the same speed and angle (see the figure below). If the ball is in contact with the wall for 0.180 s, what is the average force ...
*October 14, 2011 by Anonymous*

**physics**

A 3.56-kg steel ball strikes a massive wall at 10.0 m/s at an angle of θ = 60.0° with the plane of the wall. It bounces off the wall with the same speed and angle (see the figure below). If the ball is in contact with the wall for 0.180 s, what is the average force ...
*October 14, 2011 by Anonymous*

**physics**

A 2.42 kg steel ball strikes a massive wall at 11.7 m/s at an angle of 60.0° with the plane of the wall. It bounces off the wall with the same speed and angle, as shown in the figure below. If the ball is in contact with the wall for 0.118 s, what is the magnitude of the ...
*October 21, 2012 by Anonymous*

**Math**

Really stuck on this question not sure where im going wrong a trapezium with top and bottom sides paralell. With a diagonal line running from the top left to the bootom right hand corner splitting the trapez into two triangles. the top left corner angle is formed by 66 deg and...
*February 3, 2014 by Evie*

**Physics**

Two spheres of equal mass are thrown against a wall with equal velocities. One sphere rebounds with 75% of its original speed, while the other sticks to the wall. Which imparted a greater impulse to the wall, the sticky ball or the rebounding ball? Justify your answer.
*November 19, 2013 by Ashley*

**Physics URGENT!!!**

A 4.02 kg steel ball strikes a massive wall at 11.8 m/s at an angle of 60.0° with the plane of the wall. It bounces off the wall with the same speed and angle, as shown in the figure below. If the ball is in contact with the wall for 0.174 s, what is the magnitude of the ...
*October 15, 2012 by Anonymous*

**trigonomitry**

A pole 7 meters long is placed against a wall at an angle of 45 degrees, what is the height of the wall
*February 14, 2008 by person*

**trigonometry**

how far from an 84 foot burning building should the base of the fire truck ladder be placed to reach the top of the building at an angle of 60 degrees with the ground. the ladder is mounted to the truck 8 ft off the ground
*March 23, 2014 by Anonymous*

**trigonometry**

how far from an 84 foot burning building should the base of the fire truck ladder be placed to reach the top of the building at an angle of 60 degrees with the ground. the ladder is mounted to the truck 8 ft off the ground
*March 23, 2014 by alex*

**math**

how far from an 84 foot burning building should the base of the fire truck ladder be placed to reach the top of the building at an angle of 60 degrees with the ground. the ladder is mounted to the truck 8 ft off the ground
*March 23, 2014 by Anonymous*

**maths**

The angle of elevation of the bottom of a window 10 meter above the ground level from a point on the ground is 30degrees. A pole projecting outwards and upwards from the bottom of the window makes an angle of 30 degrees with the wall. If the angle of elevation of the top of ...
*January 23, 2013 by Anonymous*

**drbob222, math ,algebra**

can you explain to me the following problem , ms.sue and others are trying to help me but they are making me more confuse. Is there any short cuts to the following problem. Directions:multiply and write the answer in simplest form. 4/12 times 10/4 first, you have to multiply ...
*December 16, 2006 by jasmine20*

**Physics **

From your vantage point on the roof of your 6.5 m tall apartment building you are launching water balloons over the 3.5 m wall at the back of your complex. The large singlshot is launching the balloons horizontally such that they just barely clear the wall 12m away. (a) How ...
*June 10, 2012 by 1234*

**MATH**

HOW DO YOU MULTIPLY FRACTIONS? what is quik and easy way to mutply fractions Multiply the numerators (top numbers) and multiply the denominators (bottom numbers). Place the multiplication of the top numbers on the top of a new fraction and the bottom numbers on the bottom of ...
*March 14, 2007 by LAURIE*

**English**

Thank you very much for your last corrections! Can you check the grammar in the following sentences, please? 1) Antony uses his rhetoric to persuade people to mutiny against Brutus. 2) History was seen as a sort of moral teacher, where the Elizabethans would find and answer to...
*February 28, 2010 by Franco*

**calculus**

A police cruiser hunting for a suspect pulls over and stops at a point 10 ft from a straight wall. The flasher on top of the cruiser revolves at a constant rate of 75 /second, and the light beam casts a spot of light as it strikes the wall. How fast is the spot of light moving...
*June 11, 2012 by soffy*

**physics**

I have been stuck on this for a while now and cant figure out what it is i am doing wrong HELP!!! A tennis ball with a velocity of 15.5 m/s is thrown perpendicularly at a wall. After strik- ing the wall, the ball rebounds in the opposite direction with a speed of 9.3 m/s. If ...
*August 20, 2012 by Alex*

**physics**

You are working in an ice skating rink and have been asked to hang a new banner on the wall. Your friend is helping you so that the ladder does not collapse by exerting a force FAL at an angle relative to the horizontal. how do you set this up?
*February 24, 2013 by James*

**Physics**

Joshua has a mass of 60kg and stands next to a wall ona frictionless skateboard. If he pushes the wall with a force of 30N, how hard does the wall push on him? Show that Joshua accelerates at .5 m/s2 away from the wall.
*February 7, 2010 by Jennie*

**Math**

I've been working on this problem for HOURS and I still can't figure it out. It's due by tomorrow. And I'm so frustrated. DX I know I have to convert ounces into gallons, but I can't find a path at all. DX Here is the question: I need to mix the gas with oil for my weed ...
*November 17, 2008 by Kiki*

**MATH!!!PLEASE HELP!!**

A wall is supported by a brace 10 feet long. If one end of the brace is placed 6 feet from the base of the wall, how many feet up the wall does the brace reach? Think of the right triangle frmed by the wall, the floor and the brace, and use the Pythagorean theorem. The brace ...
*February 27, 2007 by megan*