# Questions Asked onNovember 1, 2011

1. ## Physics

A 1200 kg car pushes a 2100 kg truck that has a dead battery to the right. When the driver steps on the accelerator, the drive wheels of the car push against the ground with a force of 4500 N . What is the magnitude of the force the car applies to the

2. ## Physics!

The following four forces act on 4.00 kg object: F1 = 300 N east F2 = 700 N north F3 = 500 N west F4 = 600 N south What is the acceleration of the object?

3. ## calculus

A rectangular beam is cut from a cylindrical log of radius 25 cm. The strength of a beam of width w and height h is proportional to wh2. (See Figure 4.70.) Find the width and height of the beam of maximum strength.

4. ## physics

A diver in midair has an angular velocity of 6.0 rad/s and a moment of inertia of 1.2 kg·m2. He then pulls is arms and legs into a tuck position and his angular velocity increases to 12 rad/s. The net external torque acting on the diver is zero. What is

5. ## Calculus

A parcel delivery service will deliver a package only if the length plus the girth (distance around, taken perpendicular to the length) does not exceed 100 inches. Find the maximum volume of a rectangular box with square ends that satisfies the delivery

6. ## Chemistry

1) What is the atomic # for selenium? 34 2) Write the full electron configuration for selenium following the (n+l) rule? I am not sure what is meant by n+l 3) write the electron configuration, grouping electrons by their "n" values. [Ar]3d10 4s2 4p4 Are

7. ## Physics

Block 1 of mass m1 slides from rest along a frictionless ramp from height h and then collides with stationary block 2, which has mass m2 = 3m1. After the collision, block 2 slides into a region where the coefficient of kinetic friction is μk and comes to

8. ## physics

A 50.0-kg block is being pulled up a 13 degree slope by a force of 250 N which is parallel to the slope. The coefficient of kinetic friction between the block and the slope is 0.200. What is the acceleration of the block?

9. ## Math

Calculate the number of grams of dextrose in 250mL of D5W. I know that the answer is 12.5g, but I do not understand the work. Please help.

10. ## Physics

A 1000-kg car is driving toward the north along a straight road at a speed of 20.0 m/s. The driver applies the brakes and the car comes to a rest in a distance of 140 m. What is the constant force applied to the car to bring it to rest?

11. ## Physics

A rock is projected from the edge of the top of a building with an initial velocity of 19.6 m/s at an angle of 31 degrees above the horizontal. The rock strikes the ground a horizontal distance of 77 m from the base of the building. The acceleration of

12. ## physics

A 747 jetliner lands and begins to slow to a stop as it moves along the runway. If its mass is 3.5 x 10 exponent 5 kg, its speed is 27.0 m/s and the net braking force is 4.30 x 10 exponent 5 N, (A) what id its speed 7.50 s later? (b) how far has it

13. ## statistics

A national park is famous for its beautiful desert landscape and its many natural rock formations. The following table is based on information gathered by a park ranger of all rock formations of at least 3 feet. The height of the rock formation is rounded

14. ## consumer math

Luis Giron works at the Pancake Palace from 3:00 p.m. until 12:15 a.m. 5 nights a week. If he takes a 30-minute break each evening, how many hours per week does he work? 46.25 hrs 44.75 hrs. 43.75 hrs.

15. ## Math

suppose u and v are functions of x that are differentiable at x=2 and that u(2) =3, u'(2) = -4, v(2) = 1, and v'(2) find values of derivatives at x = 2 (d/dx)(uv) = ? I would like to know how to set this up because I'm only used to getting problems that

16. ## physics

Water at 50 degrees C can be obtained by mixing together which one or more of the following combinations? Which of the others would have final temperatures higher than 50 degrees C and which lower than 50 degrees C? What will be the final temperatures for

17. ## Math- Pre calculus

A community bird-watching society makes and sells simple bird feeders to raise money for its conservation activities. The materials for each feeder cost $5, and the society sells an average of 20 per week at a price of$9 each. The society has been

18. ## calculus

The hypotenuse of a right triangle has one end at the origin and one end on the curve y = (x^4)(e^-7x), with x > 0. One of the other two sides is on the x-axis, the other side is parallel to the y-axis. Find the maximum area of such a triangle.

19. ## Chemistry

How would I get the Ice of the titration of 40.00ml of 0.100M H2NNH2(aq) having a Kb of 3.0x10^-6 by 0.100M HClO4(aq)? Trying to plot a pH curve. I know the combination of acid base is strong acid weak base

20. ## chemistry

Two students Mac & Cheese, were arguing about covalent and ionic bonds. Mac says that covalent bonds could be compared to a good marriage. Do you think one has a better comparison than the other or are both of them equally right ?

21. ## physics

You jog at 6.2 mi/h for 5.0 mi, then you jump into a car and drive for another 5.0 mi. With what average speed must you drive if your average speed for the entire 10.0 miles is to be 10.6 mi/h? I don't get why the answer isn't 15.

22. ## Physics Energy & Acceleration

A light spring with force constant 3.45 N/m is compressed by 7.92 cm as it is held between a 0.241 kg block on the left and a 0.482 kg block on the right, both resting on a horizontal surface. The spring exerts a force on each block, tending to push them

23. ## calculus

Find the smallest positive value of x which satisfies 1.400cos(1.000x) Give answer in four decimal places for accuracy.

24. ## physics

a magnetic crane left a mass 1500 through a vertical height of 40m.calculate the work done in operating the crane

25. ## geometry

One of the angles in a right triangle has a measure of 73 degrees. What is the measure of the other acute angle?

26. ## Chem

With which of the following will the weak acid HCHO2 react? If a reaction occurs, write the balanced molecular equation. If no reaction occurs write the left half of the reaction and use "NR". Do not include physical states in your answers. KOH: NH3:

27. ## physics

a weather balloon carries instruments that measure temperature,pressure and humidity as it rises through the atmosphere.Suppose such a balloon has a volume of 1.2 m^3 at sea level where the pressure is 1 atm and the temperature is 20 degree Celsius.When

28. ## Physics

Two skaters, one with mass 68 kg and the other with mass 47 kg, stand on an ice rink holding a pole of length 8.8 m and negligible mass. Starting from the ends of the pole, the skaters pull themselves along the pole until they meet. How far does the 47 kg

29. ## statistics

6. You read in a book about bridge that the probability that each of the four players is dealt exactly one ace is about 0.11. This means that A. in every 100 bridge deals, each player has one ace exactly 11 times. B. in one million bridge deals, the number

30. ## College algebra

system of linear equation The sum of 3 numbers is 14 the largest is 4 times the smallest the sum of the smallest and twice the largest is 18 what are the 3 numbers? show work? A. how many unknowns you have? -how many equations need to be solve for that

31. ## Chemistry

In the cchemistry lab we conducted an experiment called atomic spectroscopy. We had to find the color, energy, wavelength, and 1/lamda for Hydrogen, neon, and mercury. For hydrogen: red 1.90ev 650nm 1.54e^-3 red 2.02ev 610nm 1.64e^-3 green 2.30ev 545nm

32. ## Algebra 2

An employee drove to work on Monday at 45 mi/h and arrived one minute early. The employee drove to work on Tuesday, leaving home at the same time driving 40 mi/h and arriving one minute late. a. How far does the employee live from work? b. At what speed

33. ## physics

Two skaters, one with mass 62 kg and the other with mass 45 kg, stand on an ice rink holding a pole of length 10 m and negligible mass. Starting from the ends of the pole, the skaters pull themselves along the pole until they meet. How far does the 45 kg

34. ## Trig

Find all real numbers that satisfy the equation. 2 cos x + 1 = 0

35. ## physics

A force of -9000 N is used to stop a 1500kg car traveling at 20 m/s. What braking distance is needed to bring the car to a halt?

36. ## Math

Ms. Hernandez has 17 tomato plants that she wants to plant in rows. She will put 1 plant in some rows and 2 plants in the others. How many different ways can she plant the tomato plants? Make a table to solve.

37. ## Physics

The average distance separating earth and moon is 384000 km. What is the net gravitational force exerted by earth and moon on a 3.00 * 10^4 kg spaceship located halfway between them.

38. ## Chemistry

How many milliliters of 0.201 M Ba(OH)2 solution are needed to completely neutralize 12.8 mL of 0.369 M HNO3 solution? The reaction is Ba(OH)2(aq) + 2HNO3(aq) → Ba(NO3)2(aq) + 2H2O(l)

39. ## math - algebra

f(t) is an exponential function with f(0) = 200 and f(3) = 2000. a) Use the form f(t) = Pe^rt to find the equation of this exponential function. b) In the form f(x) = Pa^x, a is the growth factor. find the growth factor. c)What input value gives an output

40. ## social studies geography

geography terms 7th grade need help in defintions of ; phyical map, political map thematic map legend title can you help me with this with definition or website

41. ## math

After flying at an altitude of 600 meters,a hot air balloon starts to descend when its ground distance from the landing pad is 10 kilomeers.What is the angle of depression for this part of the flight?

42. ## english

hi everyone someone can say me if my dialogue it's good and say me also about the fault:)thnaks This scene takes place at Brian's parents home. Banks informs his wife about the call he has just had with their son "Sandra you can come and sit down next to

43. ## math

Please help me with these 1. -5/c = 1/3 2. k/8 = -2/5 3. 6/z = -3/5 Thank you

44. ## College Physics

A simple Atwood’s machine uses a massless pulley and two masses m1 and m2. Starting from rest, the speed of the two masses is 6.7 m/s at the end of 6.1 s. At that time, the kinetic energy of the system is 85 J and each mass has moved a distance of 20.435

45. ## Physis Home work

Two 0.85Mtrs -long pendulums hang side by side. The masses of the pendulum bobs are 50g and 70g . The lighter bob is pulled aside until its string is horizontal and is then released from rest. It swings down and collides elastically with the other bob at

46. ## mathematical finance

The yearly cash flows of an investment are(-1000,-1200,800,900,800) Is this a worthwhile investment for someone who can both borrow and save money at the yearly interest rate of 6%?

47. ## algebra

Mr. Hundley has a big collection of silver dollars and 50-cent pieces. He promised to give one fourth of his collection to the first teacher who can figure out the total values of his coins. These are the only clues: There are 132 more silver dollars than

48. ## Ashford

Beth gives Megan $2 allowance a week. Then she takes Megan shopping and allows her to select what she wants to buy. If the item desired costs more than$2, Megan's mother suggests she save her money until she has enough saved to pay for the desired item.

49. ## Physics

Question # 1 Marks = 12 A worker pushes 25Kg crate a distance of 5m along a level floor at constant velocity by pushing horizontally on it. The coefficient of kinetic frication between the crate and the floor is 0.23. (a) What magnitude of force must the

50. ## math

If points S, O,and N are collinear, how many lines do they determine?

51. ## Calculus

Answers to any of these questions would be of great help! (: 1 a) At noon, ship A is 150km west of ship B. Ship A is sailing south at 50km/h and ship B is sailing north at 30km/h. How fast is the distance between the ships changing at 4:00pm? b) A

52. ## Physics

a student attaches a mass to the end of a 0.80 m string. The system will be whirled in a horizontal circular path at 31.5 m/s. The maximum tension the string can withstand without breaking is 250 N. What is the maximum mass the student can use?

53. ## Bepper

One end of a long 26 foot ladder is on the floor and the other end rests on a verical wall the bottom end of the ladder is pulled away from the wall qt a rate of 4 feet per second. how fast is the angle formed by the ladder and the floor changing when the

54. ## physics

Consider a roller coaster as it travels near the bottom of its track as sketched in the figure below. At this point, the normal force on the roller coaster is three times its weight. If the speed of the roller coaster is 27 m/s, what is the radius of

55. ## calculus

Given f(x)=sin(x)-2cos(x) on the interval [0,2pi]. a) Determine where the function is increasing and decreasing. b) Determine where the function is concave up and concave down. ________________________________________ I know: f′(x)=cos(x)+2sin(x)

56. ## geometry

anthony is building a picnic table for his patio. he cut one of the legs at an angle of 40 degrees. at what angle should he cut the other end to ensure that the top of the table is parallel to the ground?

57. ## math

how do you find the slant asymtote of f(x) = (x^3)/(x^2-1) ?

1) True/false: For any real number x, ln e^x = x. I think that is true. 2)true/false: (2 ln x)/ ln 10 = ln x^2 - ln 10 for all positive x. I think this is true too.

59. ## physics

One end of a massless coil spring is suspended from a rigid ceiling. It is found that when a 3.3 kg mass is suspended from it the spring stretches 105 mm when the mass comes to rest. (a) What is the spring constant for the spring? (b) If the mass is then

60. ## physics-question 7

A baseball is thrown at an angle of 26 degrees relative to the ground at a speed of 22.1 m/s. The ball is caught 39.2327 m from the thrower. The acceleration due to gravity is 9.81 m/s2 . How high is the tallest spot in the ball’s path? Answer in units

61. ## Math

You are bending a wire to make a coat hanger. The length of the wire is 88 centimeters, and 20 centimeters are needed to make a hook hanger. The triangular portion of the hanger is an isosceles triangle. The length of one leg of this triangle is 3/5 the

89. ## math

Mack’s hourly wage is raised from $12.10 per hour to$13.35 per hour. He works 40 hours per week. How much more does he earn per week at this new rate?

90. ## Help

help solve 7^(11/13)

91. ## Algebra

Is this radical expression true or false? 28 minus 4th root of 2 equals 24th root of 2

144. ## math

Can you please help explain this problem? Maurice says that a(square)+ b(square)=(a+b)(a+b). Is this always true, never true, or sometimes true? Explain.

145. ## Optimization (Math)

The mayor of a village wants to build a library of which the windows have a shape of a rectangle on top of a square. The total perimeter of each window is of P meters and varies depending on each windows size. Find the dimensions of the windows in terms of

146. ## SRA Math

The rectangular region shown has been divided into nine square regions, all different in size. The area of square 3 is 64 cm. The area of square 5 is 81cm. what is the area of the rectangle?

147. ## Math

Show 25 broken key is 5 show 2 ways

148. ## GEOGRAPHY

According to the estimate in 2001 which country ranks first in population then second then third?

149. ## Math

Write the fraction as a mixed number. 38/3 Is 12 2/3 the correct answer?

150. ## physics

A 7.5 kg object moving at 7.3 m/s collides inelastically with a 4.0 kg object which is initially at rest. What percentage of the initial kinetic energy of the system is lost during the collision?

151. ## math

Explain why one column in a hundredths grid is equal to one column in a tenths grid?

A 50-kg crate is pulled across the ice with a rope. A force of 100 N is applied at an angle of 38° with the horizontal. Neglecting friction, calculate the acceleration of the crate AND the upward force the ice exerts on the crate as it is pulled.

153. ## algebra

My science class is pretty small. There are just 18 students in the class. My teacher, Mr. Burnett, has an unusual system for picking lab partners. He has given each student a number from 1 to 18, and on lab days, he pulls two numbers out of a bag to match

154. ## English

I write a moral delima story could you please read it and give your idea about the below story In the 50s; before the black people use their rights. There was a man called Momo he was from America in an organization called the klu klux klan (kkk) it was a

155. ## Physis Home work

Two 0.85Mtrs -long pendulums hang side by side. The masses of the pendulum bobs are 50g and 70g . The lighter bob is pulled aside until its string is horizontal and is then released from rest. It swings down and collides elastically with the other bob at

156. ## Math

Danny gave Rose $28 less than she already had. She now has$120. that means Rosario originally had how much????

157. ## physics

A 5.6-kg bowling ball is accelerated from rest to a velocity of 17 m/s as the bowler covers 5.0 m of approach before releasing the ball. What force is exerted on the ball during this time?

159. ## physics

A 130g ball moving at 0.35m/s in the x-direction is subject to a 0.25N force in the - y-direction for 1.0s. Find the magnitude of the ball's momentum change.

160. ## writing sentences and paragraphs

need your Opinion please before submitting assignment Background You’ve applied for a specific job in your field of study. The Human Resources Department arranges an interview and tells you to bring with you a polished piece of writing for them to

161. ## PREDICT

In 1955 each farm worker in the United States produced enough food to feed 20 people. By 1960 farming methods had improved, and one worker could supply 25 people. By 1965 that number became 40 people. In 1970 it was 45 people.In 1975 it increased to 60

162. ## Calculus

In this exercise, we estimate the rate at which the total personal income is rising in a metropolitan area. In 1999, the population of this area was 942,200, and the population was increasing at roughly 9100 people per year. The average annual income was

163. ## medical

accreditation affect the practical activities of record management in hospitals

164. ## math

for F(x) = /x-2/ (absolute value) When you graph this problem, does it have a straight line or a "v" line?

Two angles

166. ## Spelling

What is a spelling triangle

167. ## algebra

what is rule for this function input 0,1,3,4 and range 4,3,1,0

168. ## math

i am having trouble with two digit dividends. here is an example 34 divided 264

169. ## English

Hi, I was wondering if you could help me.. I got this alliteration poem homework from my teacher, and it has to be five lines. I made four lines: Paige predicted that it was the precise time to take the test. Her heart pounded powerfully as she proceeds

170. ## Calculus

What is the second derivative of (x^3)/(x^2-1)?

171. ## Math word problem

jack was 21 years older than kat. Together their ages totaled 161 years. What were their ages?

172. ## physics

A 2.5-kg block slides down a 17.0° inclined plane with constant acceleration. The block starts from rest at the top. At the bottom its velocity reaches 0.70 m/s. The length of the incline is 1.7 m. What is the acceleration of the block? What is the

173. ## english

where do i put commas in this sentence?many children were absent on moanday and Friday

174. ## English

How do you call a meeting of teachers headed by the school principal? Thank you. I need to include the correct word in the following sentence. 1) I really hope that the teachers' conference will approve/welcome/agree with/ the decision of a partnership

175. ## Chemistry

Ammonia, at stp, 1.5L of N2 reacts with 4.5L of H2, if N2 and H2 are consumed, what volume of NH3 at stp will be produced?

176. ## Algebra

8x-12=3x+38 what is X?

177. ## social studies

The economic success of the Mughals in India was dependent upon A. success of exporters. B. economic success of subjects under their rule. C. low levels of taxation. D. the success of external markets. I think it is B, but im not sure

178. ## pre-calc

If the initial investment of 1000 doubles in value in 9.8 years find the rate for continous compounding. so the formula would be A=Pe^rt but where do the numbers go and how do u solve it? Thanks!

313. ## math

Which is the correct symbol to make the resulting inequality true? 4 4/3 > 4 1/2 Or 4 4/3 < 4 1/2 What does this mean?

314. ## algebra

Video game company hires gamers to test a new adventure game. The number of levels completed by an average gamer is given by L = 60/(3+17e^-0.1t) where L is the number of levels completed after t hours of playing. a) How many levels is a gamer expected to

315. ## math - algebra

f(t) is an exponential function with f(0) = 200 and f(3) = 2000. a) Use the form f(t) = Pe^rt to find the equation of this exponential function. b) In the form f(x) = Pa^x, a is the growth factor. find the growth factor. c)What input value gives an output

316. ## math - algebra

f(t) is an exponential function with f(0) = 200 and f(3) = 2000. a) Use the form f(t) = Pe^rt to find the equation of this exponential function. b) In the form f(x) = Pa^x, a is the growth factor. find the growth factor. c)What input value gives an output

317. ## physics

Once a 15 kg crate is in motion on a horizontal ﬂoor, a horizontal force of 56 N keeps the crate moving with a constant velocity. The acceleration of gravity is 9.81 m/s 2. What is µk, the coeﬃcient of kinetic friction, between the crate and the

318. ## Health

3. Which of the following is NOT a physical change both boys and girls experience during adolescence? a. facial acne b. growth spurts c. rinse in sex hormones d. deepening of voice C or D.. 4. For teens to communicate effectively with their parents, they

319. ## mathTonyaMath

Multiply; then reduce to lowest terms 5 1/2 • 3/4 Is the correct answer 4 1/8 ?

320. ## physics

the two upper front teeth of a person exert a total force of 30 N on a piece of steak.IF THE BITING EDGE OF EACH TOOTH MEASures 10mm x 1 mm,find the pressure on the steak

321. ## math

determine the value of N: N/20 * 100%=60%

322. ## math's

how do you add together all the number's up to 100, Quickly though.

323. ## Computer Networks

In 1000BASE-X, a frame of 64 bytes is fi rst block coded with 8B/10B before transmitting. Suppose the propagation speed is 2 × 10 8 . What is the frame “length” in “meters”? (Suppose the cable is 500 m long.)

324. ## Predict

In 1955 each farm worker in the United States produced enough food to feed 20 people. By 1960 farming methods had improved, and one worker could supply 25 people. By 1965 that number became 40 people. In 1970 it was 45 people.In 1975 it increased to 60

L=Ph for h

326. ## Literature-SATIRE201

in modest proposal, Find sentences in which the speaker uses ethical appeals?

327. ## algebra

the perimeter P of a square is four times the length of ones side s, or P=4s. Is (1455) a solution of this equation? If not, find a solution that uses one of the given values

329. ## history

What was the main motivating factor for European maritime expansion in the sixteenth and early seventeenth centuries? A.to spread christian valves. B.To increase economic opportunity. C.To seek out new lands for increasing populations. D.To conquer othe

330. ## HOMEWORk check english

1. Jordan was studying for his criminal justice exam, and his brother offered to help him study. He went over each of the questions with him. a. Jordan was studying for his criminal justice exam, and his brother offered to help him study; so he went over

the total cost of manufacturing 100 cameras per week is 700 $and 120 cameras per week is 800$ ,the the cost equation ,assuming it to be linear is