1. Physics

A 50 g ball of clay traveling at speed v0 hits and sticks to a 1.0 kg block sitting at rest on a frictionless surface. A) What is the speed of the block after the collision? B) What percentage of the ball's initial energy is "lost"?

2. Science Plzz Help

1. Which of the following effects would you expect if red blood cells were shaped like neurons? A. They would not be able to move as easily through capillaries.***** B. They would more easily carry out gas exchange in the alveoli. C. They would not need to

3. Chemistry

a) Which of the following reagents would oxidize Zn to Zn2 , but not Ag to Ag ? Answers are: Co2+ Ca2+ Br2- Br2 Co or Ca b) Which of the following reagents would oxidize Ag to Ag , but not Cl– to Cl2? Answers are: Co Br- Br2 Co2+ Ca2+ or Ca

4. Which one is correct?

Emma 6^2*6^5=36^7 Erin 6^2*6^5=6^10 Eden 6^2*6^5=6^7 and what did the other two do wrong?

5. math HELP!!!!!!

2. Researchers at Jackson Hospital asked 40 randomly selected patients about their sleep habits. Sixteen reported sleeping 8 hours or more each night. If their are 700 patients in the hospital, estimate the number of patients who sleep 8 hours or more each

6. Intro to computer

you want ghost your network's computers with a fresh desktop that features Windows 8, as your computer currently using windows 7. You will use Norton Ghost to do this. What source will Norton Ghost utilize to install Windows A. The ISO installation file

7. math HELP!!!!!!

A newspaper reporter wants to know how popular the hobby of bird watching is in the city. He asked people at the local bird refuge if they watched birds as a hobby. Which of the following best explains whether the reporter's data is valid or not? A. The

8. Physics

A) What is the kinetic energy of a 1200kg car traveling at a speed of 30 m/s (≈65mph)? B) From what height would the car have to be dropped to have this same amount of kinetic energy just before impact?

9. Science Plzz Help

5. How do the circulatory system and the endocrine system interact in helping to maintain homeostasis in humans? A. The endocrine system produces hormones that are transported by the circulatory system to target cells when changes are needed. B. The

10. geometry

Kristen lives directly east of the park. The football field is directly south of the park. The library sits on the line formed between Kristen’s home and the football field at the exact point where an altitude to the right triangle formed by her home,

11. MATH!!!

Writing a linear equation You are given the 2012 value of a product and rate at which the value is expected to change during the next 5 years. Use this information to write a linear equation that gives the dollar V of product in terms of the year. (Let

12. Calculus

find the area of the region inside the limacon r= 8 + 4sin(theta) HElp!! if you can show steps, i'd be greatful

13. math 1 question!!!!!!

Which is the best display for the set of the number of daily 911 calls made during a month, if you want to be able to identify the mode? A. Histogram with intervals of 5

14. math

Lucy is thinking of a number. The number is greater than two hundred twenty-five. Her number is less than 2 hundreds 2 tens 7 ones. What is Lucy's number?

15. when the energy of a sound wave is transferred to

when the energy of a sound wave is transferred to a particle of a medium and causes it to vibrate and generate heat, the sound wave is a. reflected b. refracted c. absorbed d. transmitted The pitch of the siren of a moving fire truck changes from high to

5. Which of the following body systems does not rely on the autonomic nervous system to stimulate involuntary events? A. skeletal system B. digestive system C. circulatory system D. respiratory system My Answer skeletal systems

17. physics

A acorn falls from a tree and hits the ground with a speed of 10 m/s: - From what height did the acorn fall? - How long was the acorn in the air?

Which factor contributed most to the increased importance of literature in American culture during the 19th century? The success of major social-reform movements***** The spread of utopian communities throughout the nation The migration of European

19. math HELP!!!!!!

Suppose 10% of the flights arriving at an airport arrive early, 60% arrive on time, and 30% arrive late. Valerie used the random-number table to find the experimental probability that of 5 flights, at least 2 will arrive late. The digit 0 represents

20. Algebra

A ball is thrown into the air. The height in feet of the ball can be modeled by the equation h = -16t2 + 20t + 6 where t is the time in seconds, the ball is in the air. When will the ball hit the ground? How high will the ball go?

21. science

I have a question on homework. please help Sea otters are part of a giant kelp ecosystem. They feed on sea urchins that feed on kelp. How does hunting sea otters affect the population of sea urchins and kelp in the ecosystem?

22. 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

23. math

a man is in a boat 2 miles from the nearest point on the coast. He is to go to point q, 3 miles down the coast and 1 mile inland. If he can row at 2 mi/h and walk 4 mi/h toward what point on the coast should he row in order to reach point q in the least

24. Simplify Polynomials

Simplify Polynomials 18x^2+6+4x-15x^2-4+13x 3x^2+6-2x+5x-4x^2+9 3x^2+3x-7x+3-5x^+2 ______________________________________________ What is the coefficient of x? -5x-4x^2+9 ______________________________________________ ADD (m^2-m-4)+(m-5) SUBTRACT

arctan(1/12)= 4.763 rounded to the nearest tenth degree, which is 4.8? because arctan=inv tan

26. math

factor completely 81x^4 - 81 possible choices are:: (9x^2 + 9)(9x^2 - 9) OR (9x^2 +9)(3x + 3)(3x - 3)

27. Science Plzz Help

Which of the following lists the phases in the correct order with respect to their occurrence in human development? a – maturation of ovaries and testes b – loss of muscle tissue c – development of problem-solving skills d – learning to walk 1. c,

28. Science Plzz Help

. Which of the following is true about diabetes? A. The pancreas overproduces glucose, and so insulin must be injected to reduce glucose levels. B. The pancreas underproduces glucose, and so insulin must be injected to increase glucose levels. C. The

29. Math

A movie theater sold a total of 390 adult and child tickets on a certain day. The theater sold 2.25 times as many adult tickets as child tickets. Each adult ticket cost $8 and each child ticket cost$3. How much revenue did the theater generate in ticket

30. Stat

A random sample of 50 households in community A has a mean household income of X- =Rs. 44,600 with a standard deviation s =Rs. 2,200. A random sample of 50 households in community B has a mean of _X = Rs. 43,800 with a standard deviation of Rs. 2,800.

31. Science Plzz Help

2. Which of the following best describes the function of the endocrine system? A. It secretes chemical messengers that travel through the blood to signal changes at target cells. B. It binds chemical messengers that travel through the blood from target

32. Chem

Complete and balance the reaction of A) (CH3)2NH(aq)+CH3COOH(aq)→ B) CH3CH2NH2(aq)+HBr(aq)→ C) CH3NH2(aq)+HCOOH(aq)→

33. science

a plane is flying due east in still air at 395km/h suddenly the plane is hit by wind blowing at 55km/h toward the west. what is the resultant of the plane?

34. Physics

20 wave crests pass a fisherman in one minute if the wave crests are 2.0 m apart find: Period Frequency Speed of waves

35. Economics

The South African government is not providing enough welfare or subsidies to the poor and underpriviledged.What are welfare payments or consumer subsidies?

36. physics

A particle moves along the x-axis from an initial position xi to a final position xf. Of the following values of xi and xf, which results in a negative displacement? (a) xi = 6 m, xf = 4 m (b) xi = ?4 m, xf = ?2 m (c) xi = ?4 m, xf = 2 m (d) xi = 4 m, xf =

37. physics

two identical copper spheres are separated by 1m in vacuum. how many electrons would have to be removed from one sphere and added to other sphere so that they attract each other with force of 0.9N

38. helpppp

the fernrod motorcycle company invested 250,000 at 4.5% compounded monthly to be used for the expansion of their manufacturing facilities. how much money will be aviable for the project 3.5 years?

39. Civic

Country A has always focused on producing cotton. Country B is a producer of coffee, grain, and textiles. Based only on this information, which statement is true about these two countries? (1 point) Country A exports more than Country B. Country A has a

40. Chemistry

please say if molecule is polar or nonpolar: H2 HBr BrCl CS2 H2S

41. Peculiar Question

What is 7/8 of an hour?

42. Physics I NEED HELP BADLY

An airplane traveling east at a speed of 270 km/h encounters a wind of 75 km/h what is the resulting speed of the plane if: - The wind is blowing east. - The wind is blowing west. - The wind is blowing north. ************* CLICK ON MY NAME TO SEE IF YOU

43. language arts

indicate the Predicate Adjective & Participle of ea sentence: 1. Nearly 150 years later, a talented ballet dancer appeared in the same city. ANS: Part= talented, PA =same 2. Anna Pavlova's family was poor. ANS: PA = poor 3. Nevertheless, she joined into

44. Trig

The problem is: an airplane is flying in the direction 120 degrees with an airspeed of 320 mph, and a 35 mph wind is blowing in the direction 60 degrees. The question ask to find the true course and the ground speed. To solve the problem I have done this:

45. one quick question? ~metaphors & similes~

is the phrase, "sway like a boat" a metaphor or a simile? i think its a metaphor

46. check my set up please, trig

Sarah holds the end of her kite string 5 feet off the ground. The kite string makes a 43 degree angle of elevation with the horizontal and the kite is 105 ft. off the ground. How long is the kite string to the nearest tenth of a foot? cos43=100/x ?

47. Math

If the number of rabbits triple every year, how many rabbits will there be after 6 years if you start off with 2? This is what I have so far: (2x3)^6 I got 46,656 for my answer but it doesn't seem like a realistic answer for the question

48. math

A road has a 10% grade (slope).how much does it rise if it is 2 km long?

49. physics

You are going for a bike ride. You ride down a straight road at a speed of 9.0 mi/hr. Just as you pass the point which is 3.6 miles from your starting point, you develop a flat tire. You get off your bike and walk it to a bike shop 0.5 miles further down

50. Physics

A 10.0 Ω resistor is hooked up in series with an 8.0 Ω resistor followed by a 27.0 Ω resistor. The circuit is powered by a 9.0 V battery -Calculate the equivalent resistance. -Calculate the voltage drop across each resistor in the circuit.

51. Math Helppp

Scores for men on the verbal portion of the SAT-I test are normally distributed with a mean of 509 and a standard deviation of 112. (a) If 1 man is randomly selected, find the probability that his score is at least 579. (b) If 13 men are randomly selected,

52. chemistry

Redox reaction in assign oxidation number is ca3(po4)2

53. Math

Noreen recently took a job helping people register to vote. The job has a mandatory 10-day period of probation during which her success rate is strictly monitored. On her first day, she registered 30 people. Then, for each of the next 9 days, she

54. *Repost* (sorry!) Health & PE HELP ASAP PLEASE!!!!

1. A long term health benefit of regular physical activity is improved A. coordination B. reaction time C. ability to fight heart disease***** D. speed 2. Ginger and Kelly go to the same middle school in their town. Ginger rides her bike daily to and from

74. Chemistry

can you please tell me if I have the correct molecule type PO4 3- polar SO3 polar NO2- polar BrCl polar

75. Science Plzz Help

4. Which of the following is true about diabetes? A. The pancreas overproduces glucose, and so insulin must be injected to reduce glucose levels. B. The pancreas underproduces glucose, and so insulin must be injected to increase glucose levels. C. The

76. math for me!!!!!!

Linda can run 1 mile in 9 minutes. How many miles can she run in 1 hour?

77. Chemistry

Can anyone name the following alcohol H3C-CH2-CH2-CH2-OH

78. math ratio

The ratio of parents to students of 4:5. If there are 189 total spectators to the game,how many of them are parents. How many of them are students.

79. Algebra 1

The architect must factor several trinomials the are of the form x2- mx + n, where m & n are whole numbers greater than zero. She wonders if any of these trinomials factor as (x+a)(x+b), where a > 0 and b < 0. Is this possible? Why or why not? I do not

80. History

What are the ethical dimensions of bill 94? (Bill in Quebec that banned face covering in any government funded building such as hospitals, government-subsidized high schools and universities) I mostly need help on the definition of ethical dimensions, I

81. Chemistry

I would like to make sure these answers are correct, the question is what kind of molecule are the following H2 nonpolar HBr polar BrCl polar NH3 polar CCl4 nonpolar

82. algebra

In a math class, 20 students stayed up late to watch the basketball game and 5 did not. What conclusion can you make?

83. Math

what is the percent grade of a hill that rises to an elevation of 1500 m with a run of 16 km?

84. Chemistry. HELP.

You react 25.0 liters of oxygen gas at STP with 50.0 ml of ethanol liquid. Ethanol has a density of 0.789 g/ml. The excess reactant is: -C2H5OH -O2 -CO2 -H2O -C -H2 -CO

85. College Algebra

A rectangular garden is 20 ft longer than it is wide. Its area is 8000 ft{}^2. What are its dimensions? w(w+20) = 8000 w^2+20w = 8000 w^2+20w-8000 = 0 (w-80)(w+100) = 0 w-80 = 0 w=80 or w+100 = 0 w = -100 I think that x=80 makes more sense. However what

86. nutrience

What is the maximum heart rate for a 35-year-old? A. 121.1 B. 183.5 C. 187 D. 205.55

87. Algebra 1

Maria has 8 cups of a fruit punch that consists of 25% orange juice and 75% apple juice. She wants to make a drink that is 40% orange juice. How many cups of orange juice should Maria add to th mixture?

88. math

fifteen less than four times seven

89. Chemistry

are these molecules polar or nonpolar? 1. [PO4] 3- 2. [NO2]- 3. SO3

90. Chemistry

How many grams of commercial C2H4O2 (97% pure by mass) must be allowed to react with an excess of PCl3 to produce 50.0g of C2H3OCL if the reaction has a 70% yield? 3C2H4O2 + PCl = 3C2H3OCl + H3PO4

91. geometry

What inequality represents the sentence below? The product of a number and 5 is no more than 8. A. 5n < 8 B. 5n > 8 C. 5n>8 D.5n

92. Chemistry

If vapour density of gas 32g and occupies a volume of 560cm cube find the mass of the gas also determine its number of molecule

93. Algebra

Graph the following inequality : 5x+4y>20

94. lang arts

Find predicate adjective & participle in sentence A participle is a verb used as an adjective. 10. While others tried new approaches, she remained faithful to the traditional methods. ANS: Part = remained (described how faithful) 11. Pavlova achieved great

95. algebra

A triangular-shaped wall has a base of 2x=4 and a height of x+3. The area of the triangle is 56 squared inches. What is the value of x?

96. Algebra

Which of the following conclusions is true about the statement below x^2=sqrtx

97. math

the table shows the type and number of pieces of each of the first 20 fruit sales at a store. Predict how many oranges will be sold if a total of 120 pieces of fruit are sold

98. lang arts

Find predicate adjective & participle in sentence 10. While others tried new approaches, she remained faithful to the traditional methods. ANS: Part = new, traditional 11. Pavlova achieved great success in several celebrated tours Ans. Part = great &

99. HEALTH

10. Based on calorie consumption and expenditure, which person will most likely gain weight the slowest? A. Madeline takes in 2,500 calories a day, and uses 2,200 calories during the day. B. Fernando takes in 2,550 calories a day, and uses 2,500 calories

100. algebra math

Equation problem for - the ratings for the tv show I Want to Be a Rockstar dropped a total of 9 points in 6 weeks. What national number represents the average change in points per week?

101. Trigonometry, can someone check this please

A sled travels from point A at the top of a hill to point B at the bottom. If the sled travels 120 m from A to B and the vertical descent AC is 50 m, what is the angle of depression to the nearest degree? arctan=50/120

102. science

All living things must carry out certain functions and possess certain structures to survive, grow, and reproduce. The following chart illustrates how humans possess certain structures to carry out these critical functions. Fill in the plant structures

ONE of the people in Sri Lanka are Sinhalese, whom are Buddhist by tradition. A smaller percentage are Tamil, of Hindu background. Civil wars have torn apart the small nation, whose is a bloody and violent history. First Tamil guerrillas attack government

104. Bio

What are 3 ways gene expression can be controlled?

105. English

1. He made his mother surprised. 2. He was surprised at the news. 3. The game was surprising to me. 4. He was surprising his mother at that time. 5. He saw his mother surprising the baby. (Are they all grammatical?)

106. science

All living things must carry out certain functions and possess certain structures to survive, grow, and reproduce. The following chart illustrates how humans possess certain structures to carry out these critical functions. Fill in the plant structures

107. Algebra

Eli collects old vinyl records. He buys 2 vinyl records each month. He started with 18 vinyl records. *make an equation to model the number of records Eli has after x months. // how many records will Eli have after 22 months?

108. Algebra

I have about 3 homework problem that I am stuck on! please help me. #1: The area of a rectangle is 16, and its diagonal is \sqrt{68}. Find its dimensions and perimeter. (x^2)+(y^2)=\sqrt{68} (x^2)+(y^2)=8.246 xy=16 y=16/x (x^2)+(16/x)^2=8.246

109. Algebra Math

Please put this into an equation problem= Chuck has 8.25 gigabytes on his hard drive. Chuck wants to load 3 movies in the drive that take up 3.6,2.8, and 4.1 gigabytes each. To make room for the movies, Chuck plans to delete a 2.3 gigabyte movie. Does

139. English

1. The game was boring to me. 2. He was bored with the game. 3. He saw the teacher boring the children. 4. He saw the students feel bored with the teacher. 5. He made the students bored with the teacher. (Are they all grammatical?)

140. geometry

1)How to find the area bounded by the 4 points in a coordinate? 2)what is the formula? 3)how the formula related to that?

141. Algebra

What are the solutions to the system? (Hint: graphing is the easiest!) y = x2 + 2x - 45 y = -3x + 5

142. Physics

The velocity of a wave on a particular string is 21.8 m/s and the string is 3 meters long. What are the 3 lowest harmonic frequencies that with produce a standing wave?

143. Physics

A car drives off a 20 m bridge at 35 m/s. Find the distance from the base of the bridge to when the car will land. (2 part question)

144. College Algebra

The problems reads: "The equation x^2-9x=0 has 2 solutions A and B. Where A < B. The answers I got where x=0 and x=9, however my online homework is saying its incorrect. Please help me (x-9)x=0 x^2=9x (x-9/2)^2-81/4=0

145. math algebra?

Is 1/3 , 3/4 , 0.2 in order from least to greatest or is 5 1/8 , 5 1/4 , 5 2/3 in order from least to greatest?

146. Math

What is -39 -(-24) -(-64) How do I do this

147. Algebra/can you help me

Write each expression in terms of common logarithms, and then give a calculator approximation (correct to four decimal places). log7^10= 1.183 How do you find the approximation log3^316 = 5.239 How do you find the approximation Thank you

148. math ratio

What is the ratio of parents to students of 4:5. If there are 189 total spectators at the game,how many of them are parents. How many of them are students.

A 1250 kg car increases it's speed from 11 m/s to 27 m/s in 5.4 s. - What is the cars acceleration? - How much force is required?

150. Math

Twenty tires are tested to see if they last as long as the manufacturer claims they do. Three tires fail the test. Two tires are selected at random without replacement for an inspection. Find the probability that both tires fail the test. Which is greater,

151. Bio

What are 3 ways gene expression can be controlled?

152. trig

Draw the graph of f(x) = tan x and g(x) = 2cos x for 180 _< thetha _< 180 {since its a graph I'm sure how to draw it here}

153. physics

two objects of equal mass are placed in a room. Object A is placed on the floor and object B is placed on a table top that is 3 meters of the ground. Which one has more potential energy and why?

154. Math

What is the slope of a line that goes through the points (4, 8) and (15, 23)?

155. physics

a body of weight 10 n is kept on a smooth horizontal table.what is the force exerted on the table by the body

156. math problem

Find an equation of the line that passes through two points. (0,4) and (7,10)

157. Math

An aircraft which is maintaining a constant altitude of 1000 meters is travelling directly away from an observer. At a particular instant the sngle of elevation is 52 degrees and 12 seconds later the angle of elevation is 16 degrees. Find the distance

158. Algebra

Simplify: b. 4√10-√10

159. Physics

A 10.0N frictionless pulley is suspended from an overhead supported by a chain. two weights suspend off the pulley. One weight is 30.0N and the other is 20.0N. (a) What is the tension on the rope? (B) what is the acceleration of the weights? (c) what is

I have about 5 homework problem that I am stuck on! please help me. The first of 5 is: A rectangular garden is 20 ft longer than it is wide. Its area is 8000 ft{}^2. What are its dimensions? Im not even sure where to start with this one. Next #2: The area

161. Two numbers with exponents??

3^3*3^33 a. 3^24 b. 3^30 c. 3^36 d. 3^99 I don't get it every time I try to solve it my answers don't match

162. Algebra/very confused

Solve the equation by finding the exact solution. I don't know if I am putting this right 3 In e = check mark over 7 and x -3 In6 Thank you it is appreciated.

The breaking strength (in pounds) of a certain new synthetic is normally distributed, with a mean of 145 and a variance of 4. The material is considered defective if the breaking strength is less than 140 pounds. What is the probability that a single,

164. science

All living things must carry out certain functions and possess certain structures to survive, grow, and reproduce. The following chart illustrates how humans possess certain structures to carry out these critical functions. Fill in the plant structures

165. algebra

X^9/x^2 H^14/h^5

166. College Algebra

The width of a rectangle is 2 less than twice its length. If the area of the rectangle is 82 cm^2, what is the length of the diagonal? Note: Your answer must be a number. It may not contain any arithmetic operations. w(w+20) = 8000 w^2+20w = 8000

167. What is the coefficient of x?

-5x-4x^2+9 a.-4 b.-5 c.5 d.9 I keep doing it but my answers don't match :(

168. Math algebra

You plan a party and spend $26 on decorations. Each of the tables will have 8 party favors and 8 individual flowers. The flowers cost$2.50 each. Which equation can you use to find the cost of each party favor? *please make an equation*

169. Algebra/can you ck my work

The breaking strength (in pounds) of a certain new synthetic is normally distributed, with a mean of 145 and a variance of 4. The material is considered defective if the breaking strength is less than 140 pounds. What is the probability that a single,

170. Math

A system of inequalities may have no solution, but is there a case where there might only be one solution?