1. physics

    a cannon fires a shell with a speed of 84m/s.when the cannon is inclined at 45 degree,the horizontal distance covered is observed as 630 m.what is the percentage decrease in the horizontal distance observed due to air resistance?

    asked by pranav prabhat on August 17, 2014
  2. Physics

    A 3kg block is resting on a table with a coefficient of friction of 0.4. It is now pushed with a force of 15n. What is the acceleration of the book?

    asked by Derrick on February 10, 2011
  3. physics

    A 16 kg block slides down a frictionless slope which is at angle θ = 20◦. Starting from rest,the time to slide down is t = 1.88 s.The acceleration of gravity is 9.8 m/s2.

    asked by Anonymous on October 26, 2011
  4. Educational perspective

    Which of the following play centers teaches the children to follow directions? A. Listening B. Dramatic C. Library D. Block answer a.

    asked by Priscila on April 22, 2018
  5. English

    What type of literary device? " At that instant he took a pistol out of his pocket and held the ice cold block at my head"

    asked by Rob on March 5, 2016
  6. physics

    If we wanted a block of iron of mass 3.25 kg to acquire a positive charge of 0.100 C, what fraction of the electrons would we have to remove?

    asked by anna on September 12, 2012
  7. Physics

    A block of mass 0.585 kg is placed on the end of a spring which has a stiffness of 294 N/m. It is pulled down 2.80 cm and released. What is the frequency of oscillation?

    asked by Em on April 5, 2016
  8. English

    Typed or printed letters should always contain _____. a formal salutation a handwritten signature contractions block paragraphs

    asked by casey on September 30, 2014
  9. physic

    Please help how much heat is needed to transform a 2.5 kg block of ice at -4°c to a puddle of water at 12°c? Cwater=4200J kg^-1 °C^-1, Cice=2100J kg^-1 °C^-1, Lf=3.33*10^5 J kg^-1.

    asked by wai on December 27, 2014
  10. science

    A cubic block of one of the substances listed on the chart has a side length of 5.0 cm and a mass of 224 grams. Which material is it?

    asked by Luna on October 20, 2018
  11. college physics

    a block of ice initially sliding at 15m/s on a frozenpond comes to rest after traveling 90 meters. What is the coefficient friction?

    asked by sarah on September 25, 2010
  12. math

    it takes 7 men 10 days to build a garage.Halfway through building the garage they get some help from 3 people and continue to work at the same rate a)How long will it take to finish of the garage b)How long did it take

    asked by Anonymous on April 6, 2013
  13. Spring constant physics?

    What is the spring constant of Spring 1, in N/m? This is in an online lab. All I know about spring 1 is that it is 30cm long, and with a mass of 250g attached, it reaches 55cm long. My answer of 4.5 (.25 * 10 = k * .55) is incorrect...why? Thank you!

    asked by Anon. on September 4, 2017
  14. college

    The angle of elevation from point A to the top of a vertical pole is 30.0 degrees. At point B, 6 meters closer to the base of the pole and on a line through the base of the pole and point A, the angle of elevation to the top of the pole is 37.0 degrees.

    asked by Ashley on December 11, 2010
  15. physics

    I am studying for a physics exam and this is the pretest. There are some that I don't understand. If someone could help me get to the answer (show all the work so I can look it all over) that would be AMAZING! Thank you very much! 2. A roller coaster,

    asked by Karrine on October 21, 2012
  16. DrBob222

    On Monday you helped me to understand and answer the one question, but I am not too sure if they want all the calculations that you answered... regretably, I am still a bit lost with these! Below is the question as it is printed: The isotope caesium-137,

    asked by Mary on February 7, 2007
  17. physics

    (ignore the other question i posted this is the right one) A rocket has a pre-ignition mass of 1100kg. On ignition it burns fuel at rate of 20kg s-1 producing a thrust of 10000N. How long after ignition of the fuel, will the rocket lift off? also explain

    asked by beavis on February 15, 2012
  18. Physics

    if the unit of power is the watt (W), and P = Fd/t, show using the result of question (2) and the fact that distance (d) uses units of meters and time has units of seconds. *** question 2. If m represents mass in kg, v represents speed in m/s, and r

    asked by Allana on September 12, 2011
  19. Physics

    if the unit of power is the watt (W), and P = Fd/t, show using the result of question (2) and the fact that distance (d) uses units of meters and time has units of seconds. *** question 2. If m represents mass in kg, v represents speed in m/s, and r

    asked by Anthony on September 12, 2011
  20. English

    My favorite Pet My favorite per in the shop is a parrot, It is green and yellow. It has a long beak. It is chirping now. I like it very much. My favorite Pet My favorite per in the shop is a lizard. It is green and ugly. It has a long tail. It is creeping

    asked by rfvv on May 28, 2012
  21. math

    A hill is inclined at 18 degrees to the horizontal. If the base of the hill is at sea level, find my height above sea level if i walk 1.2 km up the hill

    asked by james on January 26, 2010
  22. physics

    A 2.25 kg ball experiences a net force of 965 N up a ramp. Once the ball reaches the top of the ramp, the force no longer acts. The force acts over a distance of 1.50 m on the ramp. Find the horizontal distance x that the ball travels before it hits the

    asked by Anonymous on November 15, 2012
  23. math, algebra

    How is 28 a perfect number? Can someone explain this to me. all i understand that all perfect numbers end in 6 and 8. But how and why is 28 a perfect number. dimes are packaged 50 in a roll. quarters come 40 in a roll.susan b anthony dollars come in rolls

    asked by Jasmine20 on December 7, 2006
  24. physics

    A 680 Hz tuning fork is held over a long vertical tube full of water. If the tube is 1.00 m long, how many resonances will be heard as the tube is allowed to empty from the bottom?

    asked by Princess on July 29, 2010
  25. Equation help

    A physics student stands at the top of a hill that has an elevation of 56 meters. he throws a rock and it goes up into the air and then falls back past him and lands on the ground below. The path of the rock can be modeled by the equation y=0.04x^2+1.3x+56

    asked by Alex on April 2, 2014
  26. Physics

    A 40.7kg wagon is towed up a hill inclined at 18.1 degrees with respect to the horizontal. The tow rope is parallel to the incline and has a tension of 139N in it. Assume that the wagon starts from rest at the bottom of the hill, and neglect friction. The

    asked by Ethan on February 15, 2012
  27. math

    Jenny is remodeling her bathroom floor. She is going to use tile that is 3/4 foot long. If her bathroom is 7 1/3 feet long, how many tiles will she need to first cover the length of the bathroom?

    asked by Kia on October 28, 2014
  28. Physics

    I solved the following question: "A ball is launched from the top of a 320 m high building at 50 m/s at an angle of 37 degrees to the horizontal. For the first 10 seconds of flight, make a table of the vertical position from the ground versus time similar

    asked by Joe on November 2, 2010
  29. Math

    If it take Ping 20 minutes to paint a fence that is 3 feet tall and 10 feet long,how long will it take her to paint a fence that is 6 feet tall and 20 feet long, assuming she continues at the same rate?

    asked by Anonymous on October 15, 2015
  30. critically anazlyzing images and using them

    Question 1 Which of the following is NOT a question to consider when analyzing visual images? Who produced the image? If there is a foreground and a background, what is in each? What are its parts, do they belong together, or do they contrast with one

    asked by christopher on April 28, 2010
  31. Geology

    Can someone please look this over and let me know if I described the Plate Tectonic Theory? Thanks. Write a 200-300-word summary about two historical figures and the process of mantle convection and plate movement. Two historical figures that contributed

    asked by A.W. on April 8, 2009
  32. math

    The tow truck was towing a car, the car is 10 ft long and cast a shadow 23 ft long if the tow truck is 17 ft long how long is the shadow of the tow truck

    asked by cindy on November 9, 2012
  33. calculus

    conic sections question 1: verify that the point (3,2) lies on the circle x^2+y^2-8x+2y+7=0, and find the equation of the tangent at this point. question 2: find the length of the tangents from the point (5,7) to the circle x^2+y^2-4x-6y+9=0 question 3:

    asked by Kelly on June 29, 2008
  34. Physics

    A freight car with a mass of 29,000 kg rolls down an inclined track through a vertical distance of 2.8 m. At the bottom of the incline, on a level track, the car collides and couples with an identical freight car that was at rest. What percentage of the

    asked by Yuki on November 16, 2011
  35. Phyics

    two blocks are moving down a ramp that is inclined at 30.0. Box 1(of mass 1.55kg) is above box 2(of 3.1kg) and they are connected by a massless rod. Find the tension of the rod if the coefficient of kinetic friction for box 1 is .226 and box 2 is .113 my

    asked by Jess on November 27, 2015
  36. HELP!

    How many times do I have to tell you the answer is d. Goodness. http://www.jiskha.com/display.cgi?id=1168934037 all you had to do was add two numbers given, and double it, and put the neg sign in front. I have no idea what the answer to this problem is,

    asked by bobpursley on January 16, 2007
  37. physics

    A circular loop of area 0.8 m2 is inclined at an angle 60° in a uniform magnetic field of 0.4 Tesla. What is the magnetic flux associated with the loop? Choose one answer. a. 0.32 Weber b. 0.16 Weber c. 0.28 Weber d. 0.14 Weber

    asked by ashley --- HELP PLEASEE!!! on June 5, 2011
  38. Pre-Algebra

    The biggest attraction at the new amusement park, World of Fun, is the huge slide that goes under the ground. To get to the top of the slide, Jon has to climb up a 56-foot ladder. Then he rides the slide to the bottom. Finally, Jon walks through a tunnel

    asked by Joy on March 11, 2008
  39. Calculus

    Hello. I would appreciate it if someone could check my answers. I'm sorry it is so long. 1.) Let R denote the region between the curves y=x^-1 and y=x^-2 over the interval 1

    asked by Shay on September 3, 2005
  40. Statistics

    Richard has been given a 5-question multiple-choice quiz in his history class. Each question has four answers, of which only one is correct. Since Richard has not attended the class recently, he does not know any of the answers. The success occurs if

    asked by Jacob on June 15, 2010
  41. Math 11

    Chung-ho is standing on the top of a building that is 135 m talk. The angle of depression to the top of the building next door is 71 degrees. The angle of depression to the basebof the building is 77 degrees. The building are 31 m apart. How talk is the

    asked by Priya on October 21, 2014
  42. Geometry

    I have a parallelogram with sides AB and CD each 36' long and sides AC and BD each 22' long. Corner A to corner D is 43'2" long and corner B to corner C is 41'1" long. How far will corner C have to travel for this parallelogram to become a rectangle?

    asked by Mike on June 16, 2012
  43. math

    The Fred Hartman Bridge allows Texas State Road 146 to cross the Houston ship channel. The bridge is 0.237 mile long. How many feet long is the bridge?

    asked by kierra on April 8, 2011
  44. Math

    Dr. Root records measurements of a vine she is studying. Compared to the first measurement, e vine has quadrupled in length. It is now more than 48 centimeters long. Use an inequality to show how long the vine might have been when Dr. Ruth first measured

    asked by Sammyjoo on May 31, 2012
  45. Math

    Dr. Root records measurements of a vine she is studying. Compared to the first measurement, the vine has quadrupled in length. It is now more than 48 centimeters long. Use an inequality to show how long the vine might have been when Dr. Ruth first measured

    asked by Sammyjoo on May 31, 2012
  46. Geometry

    I have another question that stumped me Line segment AB with length a is divided by points P and Q into three line segments: AP , PQ, and QB , such that AP = 2PQ=2QB. Find: A)the distance between point A and the midpoints of the segments the segment QB B)

    asked by Ava on September 24, 2016
  47. English

    1. She is on the car. [She is on top of the car. She is on the top of the car. ] 2. She is in the car. [She is inside the car to drive.] 3. She is at the car. [She is by the car... Is my explanation right?] 4. She is on the bus. [Is she on top of the bus

    asked by rfvv on April 7, 2018
  48. math

    Hi, This is the third time I posted this because it wasn't answered by anyone. PLEASE help. I think the first part is correct but I am not sure if the V=lw10 is correct. I got 10 for the number of cubes. Here is the question There is a picture with stacked

    asked by ES on March 19, 2013
  49. physics

    A 65 kg crate is dragged across a floor by pulling on a rope attached to the crate and inclined 25° above the horizontal. (a) If the coefficient of static friction is 0.54, what minimum force magnitude is required from the rope to start the crate moving?

    asked by Sam on October 18, 2010
  50. English

    Can you tell me if the following sentences or phrases are possible? Thank you very much in advance. 1) I'm wearing a pair of blackt trainers withe the logo Nike on them, 2) Did you have to work this weekend? 3) I usually wear patterned, checked or striped

    asked by Franco on May 23, 2010
  51. Math

    I have posted this over 3 times and I just want to know if I did the 2nd part correctly with v. Do you multiply it by 10 for 10 cubes or 32 for 32 sides for all of them. Can anyone please help, I just want to learn the correct way to do this. Thanks! The

    asked by Es- CAN ANYONE HELP? on March 19, 2013
  52. Physics

    An insulating sphere of mass m and positive charge q is attached to a spring with length h and spring constant ks and is at equilibrium as shown below: An infinitely long wire with positive linear charge density λ is placed a distance l away from the

    asked by rickross on November 8, 2013
  53. HISTORY HELP plsssssssss

    Use this map to answer the following question: This image shows a map of South America. The western coast is shaded blue. There are four numbers marking different areas on the coast. The first number marks an area at the very top of the shaded area. The

    asked by Oscar on April 19, 2016
  54. math

    a park has 4 hiking trails. Trails A and B go from the lodge to the dock. Trail A is 1/2 mile long, and Trail B is 2/3 mile long. Trails C and D go from the dock to the park entrance. Trail C is 1/4 mile long and trail D is 1/3 mile long. Draw a picture of

    asked by Anonymous on December 5, 2013
  55. fraction writing to explain

    a park has 4 hiking trails. trails A and B go from the lodge to the dock. trail A is 1/2 mile long, and trail B is 2/3 mile long. trails C and D go from the dock to the park entrance. Trail C is 1/4 mile long, and trail D is 1/3 mile long. Draw a picture

    asked by Nathan on February 23, 2010
  56. math

    a park has 4 hiking trails. Trails A and B go from the lodge to the dock. Trail A is 1/2 mile long, and Trail B is 2/3 mile long. Trails C and D go from the dock to the park entrance. Trail C is 1/4 mile long and trail D is 1/3 mile long. Draw a picture of

    asked by Anonymous on December 5, 2013
  57. enlgish

    not a question, just want you to check my revision of a draft with an action lead in. this is just the revision of the beginning, i may post more revisions of my draft for the middle and end, and will probably ask questions in the answer section. Revision

    asked by anon on September 8, 2015
  58. Math

    Thank you Reiny for the last question! :) If you or anyone else could help me with this other question, I'd really appreciate it! Use the trigonometric subtraction formula for sine to verify the identity: sin(pi/2-x)=cosx Caluculation: ----- ----- -----

    asked by Don'tknowtrig on May 28, 2018
  59. Science (Chemistry)

    Identify the manipulated and responding variables in this testable question: "Does orange juice transform from a solid to a gas at the same exact rate as water?" My question is, what will you be changing in this lab (MV) and what are you measuring (RV)?

    asked by Alexandre on January 16, 2015
  60. social studies

    i have another question that i dnt understand. its say::::: explain why german, viking and magyar tribes contributed to the fall of the roman empire... nd the second question is why was feudalism adapted in europe in the middle ages????

    asked by katherine on September 14, 2011
  61. psychology

    hi im stuck on a question on my assignment, question , sometimes when going to meet jamie , karen mistakes someone else for him , her motivation and expectations of seeing him effect her perceptions, could you direct me to one study illustrating either of

    asked by mark on January 18, 2011
  62. Need help in clarifying this sentence.

    What are the key epistemological issues raised by Eugen Weber as he reflects on the nature of historical scholarship? I am having a hard time understanding what the above question is asking me... DO you mind clarifying the above question for me? Thanks

    asked by Judith on May 3, 2009
  63. History

    one more question sorryy xD The process established by the Constitution for electing the president. A popular vote B primary election Cthe Electoral College Im thinking C but this question i don't get so can you please explain it please

    asked by just my answer plz on September 29, 2016
  64. science

    My apology. I posted the previous question in correctly. Here is the question again: To bring 100cc of water from 20C to 75C, in 1min 25 sec, with 650Watt of energy input, what is the temperature required?

    asked by CM on November 15, 2012
  65. Math

    find two factors of 28 with the sum of 11. Surely by the time you posted this question, you should have been able to figure out that very simple question. Give it a try!!! Let me know what you came up with. well I think its 7 and 11. I was looking for

    asked by kg on March 27, 2007
  66. history essay

    Hi i need help with this essay question. The declaration of indepdence stated that all men are created equal. Yet there was a condriction in that there were slaves. How did late 18th century americans reconcile this contridiction. Hi i am very confused

    asked by fred on October 30, 2008
  67. science

    Fill in the blank with the word or phrase that best completes the statement or answers the question. 14. The scientific name for a plant that reproduces with flowers is a(n) (1 point) 15. At certain times of the year, the male sage grouse can be seen

    asked by Adri, on October 15, 2015
  68. geometry easy

    The perimeter of equilateral triangle TRY is 9y+45 and TY = 2y+25 . find the perimeter of triagle TRY. The perimeter of a parallelogram ABCD is 66 cm, and DC is twice as long as BC . how long is AB ? 2 QUESTIONS .. ANSWERS PLEASE TELL ME WHAT TO DO

    asked by nicole on October 22, 2013
  69. geometry easy

    The perimeter of equilateral triangle TRY is 9y+45 and TY = 2y+25 . find the perimeter of triagle TRY. The perimeter of a parallelogram ABCD is 66 cm, and DC is twice as long as BC . how long is AB ? 2 QUESTIONS .. ANSWERS PLEASE TELL ME WHAT TO DO

    asked by nicole on October 22, 2013
  70. math

    Yoshi has a rope 30 feet long. He must cut it into pieces that are 1/4 long. Will he get more or fewer than 30 pieces? I think more because he will divide it. So I think he will get 120 pieces. Is this correct?

    asked by Anonymous on February 27, 2015
  71. physics

    The drawing shows the top view of two doors. The doors are uniform and identical. Door A rotates about an axis through its left edge, and door B rotates about an axis through its center. The same force is applied perpendicular to each door at its right

    asked by Anonymous on April 14, 2014
  72. physics

    The drawing shows the top view of two doors. The doors are uniform and identical. Door A rotates about an axis through its left edge, and door B rotates about an axis through its center. The same force is applied perpendicular to each door at its right

    asked by john on July 16, 2013
  73. Test taking Stratagies (2 questions) help me plz

    1.)Which of the following is a good way to approach answering an essay question on a test? A.)Start writing your answer as soon as you have read the question B.)Jot down a rough outline before you start writing**** C.)Write as much as you possibly can

    asked by Aaliyah on January 20, 2016
  74. physics

    A box is pushed a distance d along a ramp at a constant speed by a horizontal force, Fa. The mass of the box is m. The ramp is inclined at an angle of  above the horizontal and the coecient of kinetic friction between the box and the ramp is k.

    asked by Anonymous on November 28, 2011
  75. math

    from a particular point the angle of elevation of the top of a church spire is 35 degrees. walking 30 metres closer to the church the angle of elevation of the top of the spire increases by 20 degrees. a. how far from the church was the second elevation

    asked by Anonymous on September 7, 2016
  76. math

    from a particular point the angle of elevation of the top of a church spire is 35 degrees. walking 30 metres closer to the church the angle of elevation of the top of the spire increases by 20 degrees. a. how far from the church was the second elevation

    asked by Anonymous on September 7, 2016
  77. math

    from a particular point the angle of elevation of the top of a church spire is 35 degrees. walking 30 metres closer to the church the angle of elevation of the top of the spire increases by 20 degrees. a. how far from the church was the second elevation

    asked by Anonymous on September 7, 2016
  78. math

    from a particular point the angle of elevation of the top of a church spire is 35 degrees. walking 30 metres closer to the church the angle of elevation of the top of the spire increases by 20 degrees. a. how far from the church was the second elevation

    asked by Anonymous on September 7, 2016
  79. math

    from a particular point the angle of elevation of the top of a church spire is 35 degrees. walking 30 metres closer to the church the angle of elevation of the top of the spire increases by 20 degrees. a. how far from the church was the second elevation

    asked by Anonymous on September 8, 2016
  80. math

    from a particular point the angle of elevation of the top of a church spire is 35 degrees. walking 30 metres closer to the church the angle of elevation of the top of the spire increases by 20 degrees. a. how far from the church was the second elevation

    asked by Anonymous on September 7, 2016
  81. math

    from a particular point the angle of elevation of the top of a church spire is 35 degrees. walking 30 metres closer to the church the angle of elevation of the top of the spire increases by 20 degrees. a. how far from the church was the second elevation

    asked by Anonymous on September 7, 2016
  82. maths (trigonometry)

    The angle of elevation and angle of depression of the top and base of a mobile tower from a mobile handset are 60 degree and 30 degree respectively. If the distances of the top and the base of the tower from the mobile handset are 15m and 8m respectively,

    asked by keya on December 11, 2015
  83. maths

    The angle of elevation and angle of depression of the top and base of a mobile tower from a mobile handset are 60 degree and 30 degree respectively. If the distances of the top and the base of the tower from the mobile handset are 15m and 8m respectively,

    asked by keya on December 11, 2015
  84. Dont I need more info for this Math problem??

    You borrow $2,000 at a rate of 3% for a period of 4 years. How much will you re-pay at the end of 4 years? This is a 7th grade math question and I feel like it's a trick question. I am thinking that I should use the simple interest formula, but I know that

    asked by SDog on March 20, 2014
  85. physics

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

    asked by dave on February 7, 2013
  86. math

    if you have a piece of string 11 ft. long and you cut it into 15 equal pieces how long will each piece be?

    asked by Madison on February 14, 2012
  87. math

    How to cut 10 boards that are 7.8 feet long into 2.25 feet long siding for a porch?

    asked by Jessica on March 8, 2016
  88. math

    Ramona cut 9 feet off a ribbon that was 7 yards long. How long is the ribbon now?

    asked by Anonymous on May 29, 2011
  89. Maths

    A cuboid is 24 cm long ,20 cm wide and 15 cm high . A similar cuboid is 16 cm long . what is it's height

    asked by Anita on January 6, 2016
  90. arithmetic

    I am 5'2 and cast a shadow 3' long. My friend casts a shadow 3' 5" long. How tall is he?

    asked by Donna on February 4, 2011
  91. math

    How many 2 1/2 meter long strips of ribbon can be cut from a ribbon that is 750cm long?

    asked by krystleallen on December 3, 2013
  92. algebra

    a 23 foot cable is cut into two pieces, one three times as long as the other. how long are the pieces?

    asked by mike on October 4, 2010
  93. Maths

    A map uses a scale of 1:100 000. If a road is 15 km long, how long will it be on the map?

    asked by Lilly-Anne on May 16, 2016
  94. Alg. 1

    A bridge in Japan is 7.6 miles long. How long would it take you to cross the bridge if you were walking at 4 mi/h?

    asked by Lorexi on October 1, 2007
  95. algebra

    how many pieces of wood each 7 1/2 inches long can be cut from a board that is 45 inches long?

    asked by milton on April 19, 2013
  96. Math Algebra Help

    Tom had a board that was 4 ft. 5 in. long. He cut off a piece that was 1 ft. 9 in. long. How much board does he have left?

    asked by Economics on December 15, 2016
  97. math

    samantha had a board that was 6 ft 8 in long she cut off a peice that was 2 ft long how much board does she have left?

    asked by mr. e on January 11, 2018
  98. math

    abby has a ribbon that was 1 meter long..she cut off 25 centimeters..how long is the ribbon now??

    asked by abigail on June 27, 2014
  99. Chemistry

    Read earlier posts on this question and still find my self confused. The question being H2SO4(aq) -> 2H^+ (aq) + SO4^-2 (aq). A 21g sample of sulfric acid dissolved completely in sufficient water to make a 0.25 l of final solution. Calculate hydrogen ion

    asked by SOS mature student on February 18, 2007
  100. math

    A pair of skydivers jump out airplane 5.5km above the ground. The equation H=5500-5t^2 is an appropriate model for the divers' altitude in metres at tseconds after jumping out of the plane. A. After 10secs how far have the divers fallen? B. They open their

    asked by ted on November 24, 2010