# Questions Asked onApril 11, 2011

1. ## fizik

Two shuffleboard disks of equal mass, one orange and the other yellow are involved in a perfectly elastic glancing collision. The yellow disk is initially at rest and is struck by the orange disk moving initially to the right at 7.00 ms"1. After the

2. ## fizik

Two shuffleboard disks of equal mass, one orange and the other yellow are involved in a perfectly elastic glancing collision. The yellow disk is initially at rest and is struck by the orange disk moving initially to the right at 7.00 ms"1. After the

3. ## algebra 1

given;n+8(n+20)=110 1;n+8n+20=110 2;9n+20=110 3;9n=110-20 49n=90

4. ## maths

would you please give the graphical representation of the region bounded by the line y=x and the parabola y=x^2-6x-10?

5. ## maths

There are 24 people in my class. Four of the don't play sport, 14 play volleyball and 11 play hockey. How may people play volleyball and hocket? A 3 B 6 C 5 D 9

6. ## fizik

b) A ball of mass 3.5 kg starts from rest and slides down a rough inclined plane 60 cm long in 0.6 s. i) Calculate the net force acting on the object along the inclined plane

7. ## maths

the product of 4 prime numbers is 2145. the product of two of them is 65. the sum of the other two must be: A 16 B 8 C 24 D 14 give me direct answe A B C or D

8. ## Languge arts

Who are the major characters in the book MAUS?

9. ## geometry

What is the relationships or patterns among regular polyhedrons - tetrahedron, cube, octahedron, dedcahedron and icosahedron regarding their number of faces, vertices, and edges?

10. ## college

The width of a rectangle is 25% of the length. The perimeter is 250 cm. Find the width and the length of the rectangle.

11. ## Geomatics

After shooting the trailing edge of the Sun on 11 April 2008, the observed clockwise angle from the mark to the edge of the sun is 259 degrees- 44 minutes- 51 seconds, the latitude is 32 degrees- 47 minutes- 54 seconds North, the longitude is 079

12. ## social - totem pole

can you explain the history of northwest coast native art?

13. ## calculus

An airplane at a height of 2000 meters is flying horizontally, directly toward an observer on the ground, with a speed of 300 meters per second. How fast is the angle of elevation of the plane changing when this angle is 45 degrees?

14. ## calculus

log (3x-9) = 2log3 - log27+ log(x+3) Solving the euqation using the properties of logarithms How do you do this?

15. ## biology

Compare and Contrast the following thyroid disorders? 1. IODINE DEFICIENCY a. Does it cause goiter (yes or no) b. Is the metabolic too high or too low? (indicate which) c. Effect on TSH levels (will they increase or decrease?) d. What is the most

16. ## physiology

Which might, in theory, be used to combat osteoporosis? Parathyroid or Calcitonin?

17. ## physiology

How is this hormones regulated: hypothlamus/pituitary axis, nervous system,feedback inhibition indicate which? 1. Follicle stimulating hormone 2. Cortisol 3. Antidiuretic hormone 4. Parathyroid hormone 5. Thyroid-stimulating hormone 6. Insulin 7.

18. ## physiology

Where is Parathyroid hormone and Calcitonin each synthesize, and by what specific type of cell?

19. ## math

The formula T=2*pi*sqrt[L/32] gives the period of a pendulum of length l feet. The period P is the number of seconds it takes for the pendulum to swing back and forth once. Suppose we want a pendulum to complete three periods in 2 seconds. How long should

20. ## chemistry

to protection of alcohol gruop, which one is better.why. trimethylsyllil or TBSCl

21. ## chemistry

Idont know a search in jacs or other juornals

22. ## HS215, Environmental Health

I need this by tomorrow morning,if possible. Describe one of the contemporary models of health from another country, and explain its strengths and weaknesses. About 150 to 200 word. Please and thank you.

23. ## chemistry

A 625mL sample of an aqueous solution containing 0.275 mol propionic acid (CH3CH2CO2H),has [H30+]= 0.00239M. What is the value of Ka for propionic acid?

24. ## chemistry

What mass of benzoic acid CH6H5COOH, would you dissolve in 400.0 mL of water to produce a solution with a pH= 2.90? Ka= 6.3 x 10^-5 mass in grams is needed.

25. ## Models for Health and Wellnesses

What do I answer? Where do I go for a list of questions?

26. ## chemistry

A particular vinegar is found to contain 5.8% acetic acid,CH3COOH , by mass. What mass of this vinegar should be diluted with water to produce 0.750L of a solution with pH= 4.54?

27. ## chemistry

One handbook lists a value pKb= 9.5 for of quinoline,C9H7N , a weak base used as a preservative for anatomical specimens and to make dyes. Another handbook lists the solubility of quinoline in water at 25degree celsius as 0.6g/100mL. calculate the pH of a

28. ## chemistry

The pH of saturated is found to be 13.12. A 15.0mL sample of saturated Sr(OH)2 is diluted to 250.0mL in a volumetric flask. A 15.0 mL sample of the diluted Sr(OH)2 is transferred to a beaker, and some water is added. The resulting solution requires 27.6mL

29. ## Lotto 5/90 maths

35 7 85 33 40 - 60 74 25 19 2 what will this game produce for the next lotto game

30. ## Maths: Algebra Matrices Class 12th

matrix{{0, 1, -1}, {2, 1, 3}, {1, 1, 1}} matrix{{1, -1, x}} matrix{{0}, {1}, {1}}=0 Find the value of x Don't give me the direct answer. Please tell me how to go about this. Draw in your notebook and then solve

31. ## economics

each individual has a budget line which they follow for expenditures. If the income of the individual increases what is the effect of the budget line?

32. ## math

how do you find 1/4 of 48

33. ## chemistry

How many moles of carbon monoxide are needed to react completely with 1.75 moles of iron oxide? based on this equation: Fe2O3(s)+3CO(g)--->2Fe(s)+3CO2(g)

34. ## Organic Chemistry III

What is a Chaser Solvent?

35. ## physic

A steel rod of length 1.0000 m and cross-sectional area 3.63·10-4m2 is placed snugly against two immobile end points. The rod is initially placed when the temperature is 0°C. Find the stress in the rod when the temperature rises to 38.9°C.

36. ## Cultural Diver in the Classrm

When you hear the term culturally different, what group comes to mind first? Describe this group and its looks, language, behaviors, attitudes, and lifestyles.

50. ## math

What is an equivalent expression of 8 • n - 18 + 6 - 5 • n

51. ## English

Can you please check the following story, especially the part included in brackets.Thank you very much. 1) Someone had stolen a ring from Peter William’s bedroom. Mr William lived on a farm with 6 servants. 2) No one had visited the farm so one of the

52. ## physics

Lead is a very dense substance. 12 cm^3 of lead has a mass of 136.8g. Wgat is the density of the lead?

53. ## math

A typical graph sheet is 18cm by 24cm. The smallest square on the sheet has an area of 1mm^2. How many of these 1mm^2 squares are on the sheet of graph paper?

54. ## English

I don't know why but my previous post has been posted twice. The word cockerel is mispelt. I'd like to add the following sentences. Thank you. 1)On our holiday, we stayed in a 5-star-hotel for four days. The hotel was luxurious, with an indoor and an

55. ## Chemistry 106

How would you prepare 1.00 liter of a 0.18 M solution of NaOh?

56. ## physic

A copper sheet of thickness 2.01 mm is bonded to a steel sheet of thickness 1.07 mm. The outside surface of the copper sheet is held at a temperature of 100.0°C and the steel sheet at 22.9°C. a) Determine the temperature (in °C) of the copper-steel

60. ## algebra

How does the number game work. How does the number game use the skill of simplifying rational expressions?

145. ## analogies

concert:stage::football game: ? (team/stadium/ field/ quarter back/ arena) i think team can you tell me if that's right

146. ## Calculus (pleas help I really need to check this)

Consider a window the shape of which is a rectangle of height h surmounted a triangle having a height T that is 1.3 times the width w of the rectangle. If the cross-sectional area is A, determine the dimensions of the window which minimize the perimeter.

147. ## physics

100g water, need to raise solution of sodiun acetate 20 degrees. how much energy does it require and how much sodium acetate will you need? Enthalpy of crystallisation is -260kJ. How do I work it out?q= Cp n ∆T? Do you use the density of SA any where? it

148. ## physics

Suppose a spherical planet P has a uniform density of 4.96*10^3 kg/m^3 and a radius R=1904 km. For a parcel that weighs 73 N on the surface of the (spherical) earth, what is A) gp/ge and B) its weight on the surface of P? Using the "tunnel mail" system

149. ## chemistry

15.45 grams of solid potassium chlorate decomposes when heated to form potassium chloride and oxygen gas. assuming 100% yeild how many grams of solid potassium will be produced?

150. ## analogies

is this correct clothes:donate::time:spend

151. ## analogies

furnace:fireplace::lamp: ? log,street light,light bulb, headlight,candle is light bulb correct?

152. ## analogies

tooth:decay::treestump (grow/die/rot/burn/rust) i think rot is that correct

153. ## stereotypes in psychology

are good dancers. drive Hummers. have more fun. are great lovers. cause trouble. are ditzy. are on welfare. live off other people. have hot tempers. are good with money. drink a lot. eat a lot.

154. ## chemistry

What would be the mass of a bag of anhydrous magnesium sulfate, MgSO4, if it contained the same amount of magnesium as a 1.00kg bag of Epsom salts, MgSO4 x 7H2O? Give your answer in grams. please help

155. ## chemistry

caffeine has a half-life of 4.6 hours in the human body.. How long would it take 125 milligrams tritium to decay to 22 milligrams?

156. ## chemistry

how much calcium oxide is recovered when 250 g calcium hydroxide are heated given the following reaction? Ca(OH)2 arrow CaO + H2O

157. ## Chemistry

How many mL of Water are made from 4 moles of HNO3?

158. ## Algebra

An airline has implemented a plan to reduce the occurrence of lost luggage. They have observed a linear relationship between the number of months the plan has been in place and the number of pieces of lost luggage. The airline recorded their findings in

159. ## chemistry

A heater caused the temperature of a 550 g Aluminum block to change from 22 degrees C to 145 degrees C. How many calories were required to heat the metal block?

160. ## math

how do you remember mixed numbers and improper fractions?

162. ## english

In the book The devil's arithmetic, what are two symbols?

163. ## PHYSICS

In the Bohr model of the hydrogen atom, the electron makes 6.00×10^15 rev/sec around the nucleus.What is the average current at a point on the orbit of the electron?

164. ## Math

Find each unit price and tell which is the better buy. A 1/2-pound hamburger for $3.50 ; a 1/3-pound hamburger for$3.25

165. ## Math

What is the value of this expression when x=-3?

166. ## Chemistry

Calculate the specific heat capacity of H20(liquid) in (Joules/mole* degrees celcius)

167. ## Algebra

How do you do long division of ((5x^4)-2)/(3x^2) _______ 3x^2|5x^4-2

168. ## French

1. Nous sommes alles faire du ski 2. Nous avons quitte Strasbourg assez tard 3. Nous avons du passer la nuit a Lyon 4. Nous sommes arrives a la montagne seulement samedi 5. Il y avait beaucoup de voitures sur la route 6. Il neigaient 7. La route etait

169. ## calculus

find the volume of the solid whose cross section is perpendicular to the x axis from isosceles right triangles and has a leg that run from the lines y=-x to the line y=.5x

170. ## software

what is the right age group

171. ## physics

AC power in the United States has 60 cycles per second. What is the period (in seconds) for this current? Round your answer to 3 decimal places.

172. ## math

Colin is working to earn some money for a new cd player. On Saturday he earned half as much as he did on Sunday, but twice as much as he did on Friday. During those three days he earned \$70. How much did he earn each day?

173. ## physics

Forces of 3 N and 4 N act the right angles on a block of mass 5 kg. Show that the resulting acceleration is 1 m/s².

174. ## physics

The forces acting on the object are 45 n and 60 n acting in the same direction. The friction force between the bag and the floor is 15n. What is the net fore acting on the bag? What is the acceleration of the bag?

175. ## Hybrid

How to reduce global warming? One effect of global warming?one affect of reducing carbon dioxide production? Please help thanks. :)

176. ## physic echooo

A hunter is standing on flat ground between two vertical cliffs that are directly opposite one another. He is closer to one cliff than to the other. He fires a gun and, after a while, hears three echoes. The second echo arrives 2.4 s after the first, and

177. ## English

1. His face turned red. 2. His face turned like red. 3. He looks pale. 4. He looks like a poet. (I thinks #3 and #4 are correct. What about #2? Is it correct or wrong?)

178. ## math

A rectangular prism has a length of x+2, a width of x+1, and a height of 4. The volume of this rectangular prism is 24. What is the length and width of this rectangular prism.

179. ## physics

You wish to accelerate a small merry-go-round from rest to a rotational speed of one-fourth of a revolution per second by pushing tangentially on it. Assume the merry-go-round is a disk with a mass of 150 kg and a radius of 1.80 m. Ignoring friction, how

180. ## art

I have to make something that looks edible, but is not. It can be a representation of something real or innovative. I also have to make a package for it-something that displays and protects. We can use any materials for it. It also has to include either a

181. ## Chemistry

If a researcher needs 0.50 L of 3.0 M nitrite buffer at pH 3.00, then she knows that the concentration of nitrous acid (conjugate acid) plus the concentration of nitrite anion (conjugate base) must equal 3.0 M. She must then calculate the amount of each

182. ## math

The ratio of the corresponding sides of two similar triangles is 3:2. The sides of the larger triangle are 15 cm, 24 cm, and 27 cm. What are the lengths of the sides of the smaller triangle?

183. ## math

on the fastest speedways, some drivers reach average speeds of 2 miles per minute. write the formula that gives the number of miles M that such driver would travel in x minutes. How would this driver travel in 37 minutes

184. ## Art Project

I have to do an art project for my art class and I am having trouble thinking of an idea. My art project has to be "shock art" its almost like DaDa but its got to be shocking. I can paint it, draw it, make a collage, or just put pictures

Henry bought 1 liter of fruit juice. He kept 1/4 liter of it in a bottle & poured the remainder equally into 6 cups. How much fruit juice was there in each cup? Give the answer in liters? **Plz show me how to solve the problem and the answer would be great

186. ## math

the length of a rectangle is 6 ffet more than twice the width. if the length is 24 feet, what is the width

187. ## english

need help with this Nominative Absolutes sentence "The town held a festival because the harvest had been so large.". is this right? The town held a festival the harvest been so large.

I have to make something that looks edible, but is not. It can be a representation of something real or innovative. I also have to make a package for it-something that displays and protects. We can use any materials for it. It also has to include either a

189. ## algebra

what is the formula to find the heigh of a trapazoid?

190. ## physics

Two charges are located along the x-axis. One has a charge of 6.2 µC, and the second has a charge of −3.1 µC. The Coulomb constant is ke = 8.98755 × 10 9 N m2 /C 2 The acceleration of . gravity is 9.81 m/s 2 . If the electrical potential energy

191. ## social studies

what are some strategies that have been proposed to child labour?

192. ## physics

An ice skater has a moment of inertia of 2.3 kg * m^2 when his arms are outstretched and a moment of inertia of 1.0 kg * m^2 when his arms are tucked in close to his chest. If he starts to spin at an angular speed of 2.0 rps (revolutions per second) with

193. ## physics

A fixed 0.16 kg solid-disk pulley with a radius of 0.070 m is acted on by a net torque of 5.0 m * N. What is the angular acceleration of the pulley?

194. ## English

Will you please make sure that I have picked out the correct preposition in each sentence? 1. Parts of wrecked ships filled one room. (of) 2. A museum guide spoke to us. (to) 3. During a storm sailors work very hard. (During) 4. Clippers traded with China

195. ## grammar

Is this sentence punctuated correctly? The oil from Eucalyptus trees, which are native to Australia, is known for its medicinal properties.

196. ## math

abby has 8 sports cards. she has either hockey or football cards she has 4 more hockey cards than football cards. how many football cards does she have?

197. ## biology

if a man is a hetero zygote for a trait but the woman is homozygous recessive, what are the chances that their children will be homozygous dominant

198. ## PENN-FOSTER

HI I AM NOW DOING FACILITIES AND STAFF BUT I AM HAVING SOME STRUGGLES WITH NUMBERS 8,9,10, 11,12 I AM ASKING SOME ONE WHO TOOK THIS CLASS TO PLEASE HELP ME

199. ## biology

DNA breaks apart when the _________ bonds between bases break??

200. ## spanish

miro ______ pizarra. what goes in the blank? voy _______ escuela. voy__________ laboratorio. escucho ___ profesor cuando el habla miro ____ alumno guapo. :)

201. ## Calculus

I need help with integrals and I need help with the problem. Integral of 4/sqrt(x)dx

202. ## Western Civilization 102

Can someone please interpret Charles Darwin thought and statements for me please: He believed that "As more individuals are produced than can possibly survive, there must in every case be a struggle for existence, either one individual with another of the

203. ## spanish

fill in the blank ?es el libro _____profesor? no, es mi libro. la clase ____ profesor de español es muy interesante. la mochila _____muchacha es rosado. yo soy ___ estados unidos. ?son los bolígrafos de teresa? no, son ____ profesora. please help

204. ## 192

a pizza has a radius of 9inches. the pizza is divided into sections. one of the section has a central angle with a measure of 60 degrees wat is da area of this section of pizza? what happens to the area of the sector if u double the central angel? how much

205. ## art appreciation

What were the chief problems of construction involved in raising the dome of the Florence Cathedral in an age that did not have today's building technologies?

206. ## calculus

how do I differentiate the volume equation to find how fast a box is filling with sand if I know the length and width?

207. ## Science

We're studying coal right now, and I have to figure which is the most polluting impurity in coal which causes damage to air and water. I'm stuck between sulfur, carbon, and mercury, because they are all damaging, but for different reasons. Which do you

208. ## Physics

A skier of mass 73.5 kg is pulled up a slope by a motor-driven cable. How much work is required to pull the skier 58 m up a 32° slope (assumed to be frictionless) at a constant speed of 2.0 m/s?

209. ## Physics

A person doing a chin-up weighs 710 N, disregarding the weight of the arms. During the first 26.5 cm of the lift, each arm exerts an upward force of 356 N on the torso. If the upward movement starts from rest, what is the person's speed at this point?

210. ## Calc

[9:52:53 PM] Pardeep Narang: y''+2ty'−4y=8 y(0)=4 y'(0)=0 i need to solve this using laplace transforms

211. ## spanish

mis hermanos y yo tenemos _______ camisas en ______ cuartos.

212. ## English

1. A group of penguins were taking off to the sky. 2. A group of penguins was taking off to the sky. (Which one is right? Do we have to use 'swere' or 'was' here?)

213. ## psy

How will the use of Ashford’s Online Library aid you in finding credible resources to support your academic writing?

214. ## biology

why warning coloration has to come before mimicry?

215. ## physics

During peak shopping season at Northbrook Court, an escalator elevates 1233 passengers a vertical distance of 7.43 meters over the course of 30.3 minutes. If the average mass of the passengers is 55.3 kg, determine the power delivered by the escalator to

216. ## Science

I'm trying to figure out the ratio of floor to window space needed for passive solar heating...some sources say windows should be equivalent to 8% of the floorspace, others 80%? What do you think is the most realistic?

217. ## College Math

I need help solving this problem, s/5 - 5/s=0

218. ## finance

1–2 pages Details: Develop a personal financial planning budget. This budget can represent a budget for a fictitious individual; however, make sure you include the following: Information you would need to prepare this budget Income Taxes Expenses

219. ## Phys

A certain ac signal at 60 Hz is applied across a 40-mH inductor and a 200-Ù resistor. What is the power factor of this circuit?

220. ## Geography

Why is Roman Catholicism the main religion in Caribbean S. America?

221. ## health

Is there anyone that could possibly help me understand medical terminology? My college course has transitioned to an all online setting with in-class closed book exams. I'm having a hard time understanding the difference in word roots and combining forms.

222. ## Physics

A 200-Ù resistor, 40.0-mH inductor and a 2.00-ìF capacitor are connected in series with a 120-V rms source at 1000 Hz. What is the phase angle of this circuit?

metrics

224. ## calculus

4(x*3)=2(x-4)+25

225. ## physics

The phase angle of an RLC series circuit with an inductive reactance of 200 Ù and a capacitive reactance of 100 Ù is 40.0°. What is the value of the resistor in this circuit?

226. ## math

Keith is wrapping ribbon around a cylindrical vase he will need additional ribbon to make a bow the vase has a volume of 602.88 cubic inches the bow requires 3 feet of ribbon to the nearest inch what is the least amount of ribbon including the bow does

227. ## Phys

A 120-V rms voltage at 2000 Hz is applied to a 6.0-mH inductor, a 2.0-ìF capacitor and a 200-Ù resistor. What is the rms value of the current in this circuit?

228. ## Geography

How have conflicts in Colombia affected the economy?

229. ## Calculus

I don't know how to do the integral of e^(lnx^2)dx and the integral of (sin sqrtx)/(sqrtx) dx

40-20=50-

231. ## Education

What are some potential problems with teachers allowing students to do hands on projects?

232. ## statistics

At a local manufacturing plant, employees must complete new machine set ups within 30 minutes. New machine set-up times can be described by a normal model with a mean of 22 minutes and a standard deviation of four minutes. a. What percent of new machine

233. ## Statistics

At a local manufacturing plant, employees must complete new machine set ups within 30 minutes. New machine set-up times can be described by a normal model with a mean of 22 minutes and a standard deviation of four minutes. b. The typical worker needs five

234. ## English

1. The finalists in the chess tournament were her and I. 2. Them and Jack want to go to the circus on Friday night. 3.Sara told him and I about the new restaurant. 4.Did Lawrence read the article about volcanoes to she and her sister. 5.Whom will bring the

235. ## PHYSICS

Two waves with different periods are described mathematically by: y3 = (7.0 m)cos[ 2£kt/(3.0 ms) - £k/2 ] y4 = (2.0 m)cos[ 2£kt/(3.1 ms) ¡V 3£k/2] What is the beat frequency for these two waves?

236. ## Geography

Why is the Atacama desert cloudy but dry

237. ## stats

the distribution of IQscores forms a normal distribution with a mean of 100 and a standard deviation of 15. what is the proportion of the population that has an IQscore greater than 130?

238. ## Western Civilization 102

Please interpret what Charles Darwin was talking about: The grounds upon which this conclusion rests will never be shaken, for the close similarity between man and the lower animals in embryonic development, as well as in innumerable points of structure

239. ## algebra 2

during the first part of a trip, a canoeist travels 47 miles at a certain speed. the canoeist travels 16miles on the second part of the trip at a speed 5mph slower. the total time for the trip is 4 hours. what was the speed on each part of the trip.

240. ## scince

A girl lifts a 12 N weight 1.5 meters. How much work does she do on the weight?

241. ## hca/125

Address the risk factors for arthritis, osteoporosis, and injuries from falls. Incorporate prevention strategies such as proper nutrition (calcium, diet).

242. ## social studies

what was one of the increased use of the assembly line in the 1920's?

243. ## statistics

A survery of 80 randomly selected companies asked them to report the annual income of their presidents. Assuming that incomes are normally distributed with a standrad deviation of #30,000, determine the 90% confidence interval estimate of the mean annual

244. ## physics

1) When electrons are forced away from a/an ___ plate, work is done. Is "positive" a possible answer? 2) Any pointed or angular surface of an object must have a/an ___ concentration of charge to establish equilibrium. Any ideas?

245. ## Physics

A 1440-kg crate of cabbages is laid on a level, frictionless track at the end of a heavy spring. The spring is compressed a distance of 0.100 m by a force of 83500 N. When the spring is released, it propels the crate. the spring constant of the spring

246. ## chemistry

Due to increased CO2 in the atmosphere, the pH of rainwater is more acidic than in the previous century. Use the following data to calculate the pH of unpolluted rainwater at 25°C: vol% in air of CO2 = 0.033; solubility of CO2 in pure water at 25°C and 1

247. ## Chemistry

Can you help me with solving this? I don't just want the answer,but how to do it. The average distance between Mars and Earth is about 1.3 108 miles. How long would it take TV pictures transmitted from the Viking space vehicle on Mars' surface to reach

248. ## Geography

How is the current government of Argentina different from the government in the 1900s?

249. ## analytic geometry

The line joining (-3,10) and (4,3) is divided in what ratio by the point (-1,8)?

250. ## Accounting

Cost-Volume-Profit Analysis and Decision-Making In order to recover from the recent operating losses that the Biggie Widget Company has experienced, management has made some tentative new decisions and believes that the use of CVP analysis will be useful

251. ## chem

write the ionic equation and the net ionic equations. 1.AgNO3 and K2S 2.ZnCl2 and Na2SO4 3.CuCl2 and Li3PO4

252. ## physics

You have a 0.35 long pendulum attached to the roof inside your car. Your car is travelling at a speed of 1.0 m/s when it hits a concrete wall and stops immediately. If the pendulum is free to swing, to what maximum angle to the vertical does the pendulum