1. physics

    Two blocks are connected by a string over a frictionless, massless pulley such that one is resting on an inclined plane and the other is hanging over the top edge of the plane. The inclined plane is inclined at an angle of 37 degrees. The hanging block has

    asked by Haff on November 20, 2013
  2. physics

    A block of mass m1 = 2.4 kg slides along a frictionless table with a speed of 8 m/s. Directly in front of it, and moving in the same direction, is a block of mass m2 = 5.0 kg moving at 2.8 m/s. A massless spring with spring constant k = 1140 N/m is

    asked by steven on October 17, 2014
  3. mathematics

    the average age of a family of six is 25 years.The average age of the four children is 15 years.If the father is 2 years older than the mother,calculate the age of the mother.

    asked by Iby on October 23, 2010
  4. Algebra

    Because of a recession, the value of a new house depreciated 10% each year for 3 years in a row. Then, for the next 3 years, the value of the house increased 10% each year. Had the value of the house increased or decreased after 6 years? Explain please!!

    asked by KG on October 22, 2014
  5. Finance

    Your client is 40 years old and she wants to begin saving for retirement, with the first payment to come one year from now. She can save 5000 per year; and you advise her to invest it in the stock market, Which you expect to provide and average 9% in the

    asked by Anonymous on October 25, 2011
  6. bond

    Assume an investor with 5 years investment horizon is considering purchasing a 7 years 6% coupon selling at par. The investor expects to reinvest the coupon at 5% and that the bond will be selling to offer a yield to maturity of 4% in five years. What is

    asked by ali on July 30, 2012
  7. Astronomy

    At what cosmic time was/is star formation density at its peak? -At present time. -Within the first billion years after the Big Bang. -At about few billion years after the Big Bang. -About few billion years ago.

    asked by qwerty on March 11, 2013
  8. social studies

    What does A.D. and B.C. stand for and what do they mean?? A.D. stands for the Latin words, Anno Domini, which means "In the year of Our Lord." A.D. years, starting with 1 A.D. count from the supposed date of Christ's birth. B.C. stands for Before Christ

    asked by Brianna on September 13, 2006
  9. accounts

    on july 01,2000, asok ltd. purchased a machine for Rs.1,08,000 and spent Rs.12000 on its installation.At the time of purchase it was estimated that the effective commercial life of the machine will be 12 years and after 12 years its salvage value will be

    asked by priyanka on October 26, 2012
  10. physics

    A cord connected at one end to a block which can slide on an inclined plane has its other end wrapped around a cylinder resting in a depression at the top of the plane as shown in the figure (Intro 1 figure) . Determine the speed of the block after it has

    asked by gdfg on May 28, 2009
  11. physics

    In a physics lab, students are asked to predict how the acceleration of the block sliding up a ramp compares to the acceleration down the ramp compares to the acceleration down the ramp. The block slides up a somewhat rough surface inclined at an angle of

    asked by Anonymous on January 21, 2015
  12. World geography

    This period was a time of great political unrest, which divided Europe into eastern and western sections. a. Cold War b. Imperialist c. Middle Ages d. Yalta Conference

    asked by Courtney on March 24, 2011
  13. Social Studies

    The Early Middle Ages 2. A tax charged by the church 18. Invaders of EEurope from Scandinavia 25. Languages that evolved from Latin 26. Men who lived in monasteries it would help if you could just give me the answer

    asked by Social Studies on May 14, 2008
  14. History

    The church had great power over people during the middle ages because it: A. protected them in times of war B. provided them with education C. decided who could achieve salvation d. controlled food production

    asked by Willy on June 20, 2012
  15. physics

    the inclined plane is 30* from the ground a) What is the mechanical advantage of the inclined plane? b) A weight of 100N is to be lifted using the inclined plane. What is the minimum applied force for this job? c) Suppose that an applied force of 200N is

    asked by sasha on January 22, 2009
  16. Physics

    the inclined plane is 30* from the ground a) What is the mechanical advantage of the inclined plane? b) A weight of 100N is to be lifted using the inclined plane. What is the minimum applied force for this job? c) Suppose that an applied force of 200N is

    asked by lulu on January 22, 2009
  17. Math

    Cassandra is two thirds as old as Jeremy. Three years ago she was half as old as Jeremy. How old are Cassandra and Jeremy? I got this question wrong and was wondering what I did wrong. This is what I did. Now 3 years ago Cassandra| C | C-3 Jeremy | J | J-3

    asked by Ann on December 7, 2013
  18. Math 116

    in 1991 the life expectancy of males in certain county was 68.6 years in 1996 it was 70.9 years let t represent the life expectancy in year t and let t represent the number of years since 1991

    asked by Jessie on May 7, 2011
  19. algebra

    in 1990, the life expectency of males in a certain counrty was 66.6 years. in 1994, it was 68.9 years. Let E represent the life expectency in year t and let t represent the number of years since 1990.

    asked by phoenix on January 8, 2011
  20. Algebra

    In 1992, the life expectancy of males in a certain country was 69.8 years. In 1999, it was 72.6 years. Let E represent life expectancy in year t, and let t represent the numbers of years since 1992.

    asked by Jerry on July 27, 2008
  21. algebra

    in 1990, the life expectancy of males in a certain country was 68.1 years. in 1995, it was 70.9 years. let E represent the life expectancy in year t and let t represent the number of years since 1990 F(x)=

    asked by andrea on August 2, 2010
  22. algebra

    in 1991 the life expectancy of males in a certain country was 68.2 years. in 1995 it was 70.8 years. let e represent the life expectancy in year t and let t represent the number of years since 1991

    asked by ken on May 18, 2011
  23. math

    in 1995, the life expectancy of males was in a certain country was 70.7 years. In 2001, it was 74.3 years. Let E represent the life expectancy in year t and let t represent the number of years since 1995.

    asked by Monti on March 14, 2010
  24. Maths

    Harry is x years old now. 3 years ago Jenny was twice Harry's age. In three years timthe Ahmed will be 5 times as old as Jenny. Write an expression for Ahmed's ago now.

    asked by Jesse on October 4, 2016
  25. math

    Solve the problem by making up an equation. A child is 12 years old, and his father is 32 years older. In how many years will the age of the father be 3 times the age of the child? Just tell me the equation.

    asked by john on February 12, 2018
  26. Math

    Mary B deposits $8500 into a savings account, compounded monthly at a nominal interest rate of 9 percent, as part of a savings plan that she would like to undertake in 5 years. 1) What is the effective interest rate per annum? 2) How much money would she

    asked by Randi on April 30, 2011
  27. history

    Which European country was controlled by Muslims throughout the Middle Ages, and what year did Christian rulers finally take power away from the Muslims?

    asked by Sara on December 18, 2017
  28. STATISTICS

    ASSUME THE THE MEAN WEIGHT OF CHILDREN AGES 7 IS 50 POUNDS AND A STANDARD DEVIATION OF 10. wHAT IS THE PROBABLITY THAT A RANDOM SELECTED 7 YEAR OLD WILL HAVE A WEIGHT THAT IS LESS THAT 65

    asked by SONIA GOVAN on February 11, 2013
  29. Earth Science

    As a star ages, its internal composition changes as nuclear reactions in the star's core convert one element into another. True or false?

    asked by Christina on March 26, 2011
  30. physics

    Two blocks each of mass 3.65 kg are fastened to the top of an elevator as in the figure. (a) If the elevator accelerates upward at 1.48 m/s2, find the tensions T1 and T2 in the upper and lower strings. (p4.21a1), enter the answer for T2, the tension in the

    asked by Anonymous on October 5, 2012
  31. Physics

    In a city grid, each block o the east-west streets is 180 meters long. Each block on the north-south streets is also 180 meters long. A walker walks 4 blocks north and then 3 blocks east. How much father did the walker travel than the actual distance

    asked by Charity on May 21, 2013
  32. physics

    Two blocks each of mass 3.34 kg are fastened to the top of an elevator as in the figure. (a) If the elevator accelerates upward at 1.31 m/s2, find the tensions T1 and T2 in the upper and lower strings. (p4.21a1), enter the answer for T2, the tension in the

    asked by lib on October 3, 2012
  33. physics

    In a city grid, each block on the east-west streets is 180 meters long. Each block on the north-south streets is also 180 meters long. A walker walks 4 blocks north and then 3 blocks east. How much farther did the walker travel than the actual distance

    asked by Shelby on June 27, 2016
  34. physics

    Two blocks each of mass 3.65 kg are fastened to the top of an elevator as in the figure. (a) If the elevator accelerates upward at 1.48 m/s2, find the tensions T1 and T2 in the upper and lower strings. (p4.21a1), enter the answer for T2, the tension in the

    asked by Anonymous on October 5, 2012
  35. Statistics

    The average life of Canadian women is 73.75 years and the standard deviation of the women's life expectancy in Canada is 6.5 years. Using the Chebyshev's theorem, determine the minimum percentage of women in Canada whose life expectancy is between 64 and

    asked by G.C. on September 6, 2013
  36. Statistics

    The average life of Canadian women is 73.75 years and the standard deviation of the women's life expectancy in Canada is 6.5 years. Using the Chebyshev's theorem, determine the minimum percentage of women in Canada whose life expectancy is between 64 and

    asked by Cyndee on September 16, 2012
  37. finance

    The Blinkelman Corporation has just announced that it plans to introduce a new solar panel that will greatly reduce the cost of solar energy. As a result, analys now expect the company’s earnings, currently (year 0) $1 per share to grow by 50 percent per

    asked by Dora on September 11, 2011
  38. finance

    The Blinkelman Corporation has just announced that it plans to introduce a new solar panel that will greatly reduce the cost of solar energy. As a result, analys now expect the company’s earnings, currently (year 0) $1 per share to grow by 50

    asked by midline on September 8, 2013
  39. History! Help!

    The Caddo were an American Indian group in Texas that practiced agriculture and build permanent houses. What can be inferred about the group? A. It created a large population B.It formed a small and defenseless population C.It had no contact with other

    asked by Iris on September 7, 2016
  40. English

    Hello everyone! I study English and my task is to find 3 activities( On anything, they don't have to be connected)which i can use in the classroom with my learners (5-8th graders).The point is that these activities have to be creative (f.e.they have to

    asked by sweru on January 3, 2010
  41. Math

    A person wants to establish an annuity for retirement purposes. He wants to make quarterly deposits for 20 years so that he can then make quarterly withdrawals of $5,000 for 10 years. The annuity earns 7.32% interest compounded quarterly. A. How much will

    asked by Anonymous on April 21, 2014
  42. physics

    A block with mass m = 17 kg rests on a frictionless table and is accelerated by a spring with spring constant k = 4201 N/m after being compressed a distance x1 = 0.556 m from the spring’s unstretched length. The floor is frictionless except for a rough

    asked by amanda on March 20, 2018
  43. physics

    A block with mass m = 17 kg rests on a frictionless table and is accelerated by a spring with spring constant k = 4201 N/m after being compressed a distance x1 = 0.556 m from the spring’s unstretched length. The floor is frictionless except for a rough

    asked by katie on March 21, 2018
  44. physics

    A block with mass m = 17 kg rests on a frictionless table and is accelerated by a spring with spring constant k = 4201 N/m after being compressed a distance x1 = 0.556 m from the spring’s unstretched length. The floor is frictionless except for a rough

    asked by fox on March 21, 2018
  45. Math

    You have to choose a battery brand to use in your smoke alarm. Company A's batteries have a mean lifespan of 1.2 years, with a standard deviation of 0.1 years. Company B's batteries have a mean lifespan of 1.5 years, with a standard deviation of 0.9 years.

    asked by Chloe on April 29, 2014
  46. 7th grade-Algebra Worth Problem

    Please show equation and solve for the following 1. Lyn's age is 8 years less than 15 times the age of her niece Elizabeth. If the sum of their ages is 24, what is Elizabeth's age ( Let e= Elizabeth's age) 2. Bob is renting a canoe for $20, plus $9.75 per

    asked by DMAR on September 24, 2009
  47. Math

    If Jack's house is 7.1 miles due north of the Senior Citizen Center and Belinda's house is 6.3 miles due west of it, then to the nearest tenth,what is the shortest distance between their houses?

    asked by Grace on July 31, 2012
  48. Algebra I

    You are in the market for a house. The sales rep informs you that there are 56 houses available with 2 floor plans. Let x represent floor plan #1, and y represent foor plan #2. Write an equation that illustrates the situation.

    asked by Patricia on May 10, 2008
  49. math(epidemiology)

    A population of 100 healthy men was followed for the development of prostate cancer. After being followed for 5 years, 20 men developed prostate cancer. Ten other men were followed for 1 year and then were lost to follow-up. The remaining men who never

    asked by Kelly on January 18, 2016
  50. VNS,Math

    In Gulshan the ratio of private homes to apartment is 3:5. If all the apartments are brick made and 1/10 of the private homes are wooden, what is the maximum portion of houses that may be brick?

    asked by Nahar on October 1, 2013
  51. Health (Ms. Sue)

    What safety concerns are particularly relevant in homes with small children? A: Injuries from fires or falls, suffocation, and electrocution are particularly relevant in houses with small children.

    asked by Anonymous on January 6, 2014
  52. statistics

    5) The lifetime of a medical device s a normally distributed rv with standard deviation of 2 years. An experiment is conducted to test 15 medical devices and find their lifetimes to be: a. If the population mean is known to be 15 years, what is the

    asked by nur on December 8, 2012
  53. math calculus

    In the year 2005, a picture supposedly painted by a famous artist some time after 1815 but before 1865 contains 95 percent of its carbon-14 (half-life 5730 years). Approximately how old is the painting? In years

    asked by Urgent help on August 30, 2015
  54. L.A.

    Choose the meaning that best describes the word in quotation marks. The first choice of vacation days should go to employees with "seniority". a. the highest age b. an inherited status ** c. the most years of service d. the most years education

    asked by Fuller on January 5, 2016
  55. math

    In the year 2005, a picture supposedly painted by a famous artist some time after 1815 but before 1865 contains 95 percent of its carbon-14 (half-life 5730 years). Approximately how old is the painting? years

    asked by Kaustubh on August 30, 2015
  56. economics

    Determine the sum of money that must be invested today at 9% interest compounded annually to give an investor annuity (annual income) payments of $5,000 per year for 10 years starting 5 years from now.

    asked by sam on June 7, 2012
  57. Jiskha

    Good evening everyone, I just wanted to know why people on this computer keep getting blocked from this site...I tried to ask and answer questions a couple of days ago and was unable to because I was obviously blocked. Whenever i pressed 'Submit Question'

    asked by mysterychicken on March 6, 2009
  58. Physics

    Three objects are connceted by a massless wires over a frictionless pulley. The right side of the pulley wire is connected to a 15kg block and right below that is a 10kg block on the bottom of the wire. The tension in the wire connecting the 10kg and 15kg

    asked by Alex on May 1, 2016
  59. physics

    A 15.2 kg block dragged over rough horizontal surface by constant force of 124N acting at an angle of 34.9 degrees above the horizontal. The block is displaced 37.8m. The coefficient of kinetic friction is .171. Acceleration is 9.8 m/s^2. Find the work

    asked by jay on February 5, 2018
  60. physics

    A 15.2 kg block dragged over rough horizontal surface by constant force of 124N acting at an angle of 34.9 degrees above the horizontal. The block is displaced 37.8m. The coefficient of kinetic friction is .171. Acceleration is 9.8 m/s^2. Find the work

    asked by jay on February 6, 2018
  61. physics

    When a block of ice at zero degrees Celcius melts, the ice absorbs energy from its environment. As the ice is melting, the temperature of the block (remains the same, increase decrease) I think it remains the same. A sample of liquid ethyl alcohol is

    asked by Anonymous on November 23, 2007
  62. Physics

    A vertical spring with a spring constant of 450 N/m is mounted on the floor. From directly above the spring, which is unstrained, a 0.30 kg block is dropped from rest. It collides with and sticks to the spring, which is compressed by 3.0 cm in bringing the

    asked by Mary on April 7, 2007
  63. finance

    Carlyle Inc. is considering two mutually exclusive projects. Both require an initial investment of $15,000 at t = 0. Project S has an expected life of 2 years with after-tax cash inflows of $7,000 and $12,000 at the end of Years 1 and 2, respectively.

    asked by LL on October 19, 2009
  64. Help ASAP

    pay back, Net present value, and Internal rate of return methods. Nucore company is thinking of purchasing a new candy wrapping nachine $370,000. The machine should save the company approximately $70,000 in operating per year over its estimated useful life

    asked by Neena on July 25, 2006
  65. math

    The ages of a population of 300 is normally distributed, with a mean of 45 and a standard deviation of 4. If you randomly selected a member of the population, what is the probablity that his or her age would be greater than 49?

    asked by Gloria on June 11, 2012
  66. Math

    Jan is on year younger than her brother Bill and on year older then her sister Sue. The sun of the three children ages is 57. How old is each child.k

    asked by Leah on September 27, 2011
  67. history

    Which of the following people was of similar status to the pope in the Middle Ages' social hierarchy? bishop vassal king knight was it the king

    asked by oscar on September 7, 2015
  68. Earth Science

    During the Dinosaur Ages, if there was a region with a mountain range, alluvial plain, and a shallow sea. Which place would it be the most likely for dinosaur fossils to be formed?

    asked by Joe on September 13, 2010
  69. Psych- FLYNN EFFECT

    The Flynn effect is an example that shows a difference in IQ among : a. ages b. genders c. cohorts d. cultures Ok, i tried this one, and i thought the answer was "generations"...so i am confused as to what the answer is.

    asked by Melissa on October 17, 2007
  70. Art Appreciation

    Discuss how art was used as a vehicle for propaganda, and whether such use is present in the works of Höch, Grosz, and Picasso. Use one example from Gardner's Art through the Ages and one from the Internet.

    asked by Robert on August 9, 2012
  71. statistics

    1- The ages of a population of 300 is normally distributed, with a mean of 45 and a standard deviation of 4. If you randomly selected a member of the population, what is the probablity that his or her age would be greater than 49?

    asked by Gloria on June 11, 2012
  72. social studies

    The historical period of intellectual and artistic creativity is known as the ______. A.)Age Of Enlightenment B.)Age Of Reasons C.)Middle Ages D.)Renaissance

    asked by cheyann on September 15, 2015
  73. Algebra

    Alex is two-fifths as old as Clara. The sum of their ages is 56. How old is Alex?

    asked by Kevin on October 18, 2017
  74. Math

    The ages of a father and son are in the ratio of 8:3. If the farther is 48, how old is the son?

    asked by Marcia on October 25, 2016
  75. maths

    Felicity has just commenced work and is investigating superannuation funds. She calculates that she will need $1 000 000 in her fund when she retires in 40 years. She finds a fund guaranteeing to pay interest on each deposit at a rate of 6% per annum

    asked by gscc on June 13, 2016
  76. maths

    Felicity has just commenced work and is investigating superannuation funds. She calculates that she will need $1 000 000 in her fund when she retires in 40 years. She finds a fund guaranteeing to pay interest on each deposit at a rate of 6% per annum

    asked by gscc on June 14, 2016
  77. English

    1. I will be 14 years old next year. 2. I shall be 14 years old next year. 3. I am going to be 14 years old next year. 4. I intend to be 14 years old next year. (Are they the same? What is the difference between 'will' and 'be going to'?)

    asked by rfvv on November 24, 2010
  78. Physics

    A 59.1 N/m spring is unstretched next to the 90 degree angle of an incline, and the system is released from rest. The mass of the block on the incline is m1 = 21.4 kg. (Neglect the mass of the pulley). If the coefficient of kinetic friction between m1 (the

    asked by Jack Johnson on October 23, 2012
  79. Math help

    Could someone work one of these out so I can use as example. A sample of 59 night-school students' ages is obtained in order to estimate the mean age of night-school students. x = 25 years. The population variance is 20. (a) Give a point estimate for ì.

    asked by DeeDee 89 on June 16, 2013
  80. English (Check)

    Underline the verbs in the past tense and circle the verbs in the past perfect tense. 1. He _told_ how he (had found) permanent houses and that he (had also seen) maize.

    asked by Victoria on February 22, 2016
  81. math modeling

    Person A opens an IRA at age 25, contributes $2000 per year for 10 years, but makes no additional contributions thereafter. Person B waits until age 35 to open an IRA and contributes $2000 per years for 30 years. There is no initial investment in either

    asked by fazilah edwin on August 20, 2011
  82. math-word problem

    In 1992, the life expectancy of males in a certain country was 73.5 years. In 1996, it was 75.7 years. Let E representthe life expectancy in yeart and let t represent number of years since 1992. Fill in the linear function E(t) that fits the data

    asked by KiKi on March 27, 2010
  83. chemistry

    Which of these elements has the electonic configuration of The energy absorbed or released when an electron is added to a gaseous atom is known as Which of these elements behave partly as an alkaline metal as well as a halogen element? Hydrogen can be

    asked by davids on April 14, 2016
  84. Physics

    Hi, here's a problem that I have difficulty with to solve. Block M2, w/c has a 20 kg mass, is on a frictionless table and it is firmly attached to one end of a spring with k = 2.5 N/m. The other end of the spring is anchored to the wall. Another block, M1

    asked by Chika on November 2, 2011
  85. Math

    Dog Debate UNIT NAME: EQUATIONS AND INEQUALITIES Directions: The traditional method for calculating a dog's age in dog years is to multiply its age in human years by 7. The chart below describes a different method some veterinarians use to estimate a dog's

    asked by Help i need somebody not just anybody on January 14, 2018
  86. Art Appreciation

    Explain how Florence reflects the ideals of the dominant city-state and how some of the geographical, economical, social, and artistic forces shape this ideal. Use one example from Gardner’s Art through the Ages and one example from the Internet.

    asked by Robert on July 14, 2012
  87. Art 101 college

    Explain how Florence reflects the ideals of the dominant city-state and how some of the geographical, economical, social, and artistic forces shape this ideal. Use one example from Gardner’s Art through the Ages and one example from the Internet.

    asked by Michelle on October 28, 2012
  88. Art Appreciation

    Explain how Florence reflects the ideals of the dominant city-state and how some of the geographical, economical, social, and artistic forces shape this ideal. Use one example from Gardener’s Art through the Ages and one example from the Internet.

    asked by Alice on April 7, 2011
  89. Ms. Sue

    Were my answers correct in the post in which you provided me with the answer below? "People used to die at young ages of heart problems, tuberculosis, pneumonia, infections, etc. Today most of these conditions can be prevented or cured."

    asked by Anonymous on November 12, 2013
  90. English

    I forgot to include these last two sentences. 1) Slaves worked either on sugar cane plantations (better of sugar cane) or in their masters' houses. If they rebelled, they could have an ear cut off or be killed. 2) For them the only way to escap ws the

    asked by Mike on March 9, 2011
  91. another word problem!

    iN 1993, THE LIFE EXPECTANCY of males was 68.6 years. In 2000, it was 71.1 years. Let E represent the life expectancy in year t and t represent the number of years since 1993. The linear function E(t) that fits this data is: E(t)=_t + _ (round to the

    asked by bob on March 28, 2010
  92. FIN200- FV, PV and Annuity Due CP

    I just want to know if anyone can help me in determining if I am on track with this assignment and if anyone can point out where I am wrong and how I need to fix it. I have already completed this assignment on my own and need someone to review it. Thank

    asked by Joy on January 26, 2010
  93. mathmodeling

    Person A opens an IRA at age 25, contributes $2000 per year for 10 years, but makes no additional contributions thereafter. Person B waits until age 35 to open an IRA and contributes $2000 per years for 30 years. There is no initial investment in either

    asked by fazilah on August 18, 2011
  94. algebra

    In 1992 the life expectancy of males in a certain country was 63.4 years. In 1997 it was 66.7 years, let E represent the life expectancy in year t and let t represent the number of years since 1992. The linear equation that fits the data is E(t)+ t round

    asked by paulette on October 16, 2008
  95. Math-Population Word Problem

    The population of rabbits in a national forest is modeled by the formula P=8,600+650 ln(t+1) where "t" is the number of years from the present. a)How many rabbits are now in the forest b)Estimate when it will take for the number of rabbits to reach 12,000?

    asked by Jake on March 27, 2013
  96. American Gov

    Under Article V of the U.S. Constitution there are two ways to propose an amendment to the Constitution: by a two-thirds (2/3) vote of both houses of Congress, or by a national convention called by Congress at the request of two-thirds (2/3) of the state

    asked by Jason on September 24, 2011
  97. Algebra

    The selling prices of houses in a city during one year were normally ditributed with a mean of $259,000 and a standard deviation of $15,000. Which of the following is closest to the percentage of the homes that had a selling Price between $244,000 and

    asked by Jessica on September 23, 2014
  98. Math

    Please help me to solve it, today is mydue day ! Suppose an individual makes an initial investment of $2400 in an account that earns 8%, compounded monthly, and makes additional contributions of $100 at the end of each month for a period of 12 years. After

    asked by Thanh on July 29, 2011
  99. physics

    The coefficient of kinetic friction for wood on wood is o.55. The coefficient of kinetic friction for wood on wood is 0.68. For a 3.5kg wood block being pulled horizontally: a. what is the pull force needed to start the wood block moving on a wood floor?

    asked by maddie on December 10, 2016
  100. physics

    A ball is attached to one end of a wire, the other end being fastened to the ceiling. The wire is held horizontal, and the ball is released from rest (see the drawing). It swings downward and strikes a block initially at rest on a horizontal frictionless

    asked by jim on November 5, 2012