1. physics

    Two blocks of mass m1 = 1.2 kg and m2 = 1.7 kg are connected by a massless string, as shown in the Figure. They are released from rest. The coefficent of kinetic friction between the upper block and the surface is 0.45. Calculate the speed of the blocks

    asked by anonymous on December 11, 2007
  2. Math: Geometry

    ok so i am really confused on my assignment. So What we are suppose to do is take pattern blocks (a triangle, square, hexagon, rhombus, trapazoid, and small rhombus) and see how many can go around a central point. I figured out that there are 6 possible

    asked by Melissa on January 18, 2017
  3. anonymous

    I need help solving these problems. I tried but my teacher did not teach it to us so it is very difficult for me. Thanks. "Projectiles launched at an angle" 1. A golfer can hit a golf ball a horizontal distance of over 300 m on a good drive. What maximum

    asked by PHYSICS.....confused on October 25, 2006
  4. history

    We has to read a book called alas babylon and we has to write an essay about how did fort repose adapt to the changes after the day. and I ran into two examples in the book that i didn't quite comprehend It says people unconsciously were inclined to split

    asked by jerson on March 8, 2009
  5. Physics

    For tests using a ballistocardiograph, a patient lies on a horizontal platform that is supported on jets of air. Because of the air jets, the friction impeding the horizontal motion of the platform is negligible. Each time the heart beats, blood is pushed

    asked by Xavier on October 24, 2010
  6. science

    A rectangular barge floats in freshwater. When a 400 kg block is loaded on the 5 m long by 2 m wide barge, the barge sinks a few centimeters deeper. How much deeper does the barge lower?

    asked by Anonymous on April 16, 2015
  7. Math

    a cylinder of wooden block has base radius 'r' cm height 'h' cm and a total surface area of 32pi cm^2 1)show that r^2+hr=16 2)given that its height is 4cm more than its base radius, find the value of 'r' and of 'h'

    asked by kaelyn on January 9, 2016
  8. physics

    A block initially at rest is allowed to slide down a frictionless ramp and attains a speed v at the bottom. To achieve a speed 3.9 v at the bottom, how many times as high h2 h1 must a new ramp be?

    asked by Anonymous on November 29, 2012
  9. CHEM PLZ URGENT!!

    19. A block of aluminum has a volume of 126.5 cm3. Its density = 2.70 g/cm3. What is the mass of the aluminum? A) 342 g B) 46.9 g C) 127 g D) 0.0213 g E) 124 g The answer is A.....But I still can't figure it out....I keep getting D as an answer..

    asked by Ania on February 22, 2008
  10. science

    A rectangular block of wood floats in water with two-third of it's volume immersed .when placed placed in another liquid ,it floats with half of it's volume immersed .calculate the relative density of a liduid.

    asked by Lenny Festus on April 20, 2019
  11. physics

    A rectangular barge floats in freshwater. When a 400 kg block is loaded on the 5 m long by 2 m wide barge, the barge sinks a few centimeters deeper. How much deeper does the barge lower?

    asked by Kareem on January 21, 2015
  12. physics

    A rifle fires a(n) 3 g bullet with a muzzle velocity of 370 m/s into a block of wood. The bullet comes to rest after it has made a(n) 17 cm deep hole in the wood. v a What is the magnitude of the average frictional force slowed the bullet? Answer in

    asked by Anonymous on December 21, 2012
  13. physics

    A ball of mass m = 0.75 kg is thrown straight upward with an initial speed of 8.9 m/s. Plot the gravitational potential energy of the block from its launch height, y = 0, to the height y = 5.0 m. Let U = 0 correspond to y = 0. Determine the turning point

    asked by Bob on February 13, 2011
  14. physics

    A 49-g bullet traveling at 290m/s penetrates a block of ice at 0∘C and comes to rest within the ice.Assuming that the temperature of the bullet doesn't change appreciably, how much ice is melted as a result of the collision? The heat of fusion of water

    asked by Anonymous on June 4, 2014
  15. physics

    A ball of mass m = 0.75 kg is thrown straight upward with an initial speed of 8.9 m/s. Plot the gravitational potential energy of the block from its launch height, y = 0, to the height y = 5.0 m. Let U = 0 correspond to y = 0. Determine the turning point

    asked by Bob on February 13, 2011
  16. Physics

    A 2kg block is released from rest at position A and falls 12 meters to the floor. At position B, just before it lands, it is falling at 15m/s. a) if the blocks potential energy is zero at B, what is its potential energy at A?

    asked by John on September 28, 2012
  17. Physics

    A 515 cm3(cm cubed) block of aluminum (D = 2.7 g/cm3) is lowered carefully into a completely full beaker of water. What is the weight of the water, in newtons, that spills out of the beaker?

    asked by Alaine' on March 28, 2012
  18. Math

    A 515 cm3 block of aluminum (Density = 2.7 g/cm3) is lowered carefully into a completely full beaker of water. What is the weight of the water, in newtons, that spills out of the beaker?

    asked by Alaine' on March 28, 2012
  19. physics

    A 1000-N crate resting on a surface is connected to a 500-N block through a frictionless pulley . Friction between the crate and surface is enough to keep the system at rest. What is the tension and friction in newtons?

    asked by Anonymous on February 21, 2012
  20. physics

    A student, crazed by the first physics Midterm, uses a pushing force of 80 N angled at 70° to push a 5.0 kg book across the frictionless ceiling of his room. a. What is the block's acceleration? b. What is the force of the ceiling on the book?

    asked by Corey on April 8, 2013
  21. physics

    You have a 15.0 kg block of wood and you drop it from rest at a great height. It reaches terminal velocity of 31.3 m/s. If this is low-speed drag, what is the value of the constant b? If this is a high-speed drag, what is the value of the constant c?

    asked by jane on March 17, 2012
  22. Physics

    An airplane flies due north at 260 km/h with respect to the air. There is a wind blowing at 60 km/h to the northeast with respect to the ground. What are the plane's speed and direction with respect to the ground?

    asked by Maddie on October 25, 2012
  23. Geometry

    A sample of a plane geometric surface is the A. surface of a sphere. B. side of a cylinder. C. side of a box. D. side of a cone. I'm stuck on this simple but tricky question. I'm leaning toward A or C.

    asked by Anonymous on June 10, 2015
  24. Math

    A plane that can fly 275 mph in still air for 3 hours against a wind and for 2 hours with the same wind. The total distance it covers is 1300 miles. Find the rate of the wind.

    asked by Adam on December 2, 2007
  25. science

    An airplane flies due north at 235 km/h relative to the air. There is a wind blowing at 65 km/h to the northeast relative to the ground. What are the plane's speed and direction relative to the ground?

    asked by mary on September 16, 2012
  26. Physics

    An airplane flies due south at 185 km/h relative to the air. There is a wind blowing at 68 km/h to the east relative to the ground. What are the plane's speed and direction relative to the ground?

    asked by Noah on December 3, 2012
  27. Physics

    An airplane flies due north at 260 km/h with respect to the air. There is a wind blowing at 60 km/h to the northeast with respect to the ground. What are the plane's speed and direction with respect to the ground?

    asked by Maddie on October 25, 2012
  28. physic

    An airplane flies due north at 200 km/h relative to the air. There is a wind blowing at 70 km/h to the northeast relative to the ground. What are the plane's speed and direction relative to the ground?

    asked by BILLY on December 5, 2012
  29. Math Trigonometry

    An airplane is flying between two towns at an altitude of 8km. One town is to the west of the plane and the other is to the east. The angle of depression to one town in de34grees and to the other town is 49degrees. What is the distance between the two

    asked by Anonymous on December 29, 2016
  30. physics

    An airplane flies due south at 185 km/h relative to the air. There is a wind blowing at 68 km/h to the east relative to the ground. What are the plane's speed and direction relative to the ground?

    asked by Danny on December 6, 2012
  31. Physics

    Three particles A, B, C start from the origin from the same time, A with velocity a along x-axis, B with velocity b along y-axis, C with velocity c in xy plane along a line x=y. What should be the magnitude of c so that they always remain collinear is (a).

    asked by Edward on November 6, 2014
  32. Physics

    An airplane flies due north at 250 km/h relative to the air. There is a wind blowing at 60 km/h to the northeast relative to the ground. What are the plane's speed and direction relative to the ground?

    asked by Preston on October 6, 2010
  33. Physics - Uniform circular motion

    If you were swingin a ball on a string around in a circle in a vertical plane, at what point in the path would the string be the most likelt to break? Explain why In what direction would the ball fly when the string broke?

    asked by Shaila on August 21, 2010
  34. Physics

    An airplane flies due north at 220 km/h with respect to the air. There is a wind blowing at 65 km/h to the northeast with respect to the ground. What are the plane's speed and direction with respect to the ground?

    asked by Martha on November 9, 2011
  35. writing

    How would you encourage a reluctant peer reviewer? What is your thinking on this? The question has been asked over the past few weeks several times, with good answers. I, and others, will be happy to critique your thinking. Please go to the site listed

    asked by nicole on June 22, 2006
  36. spanish

    "Perdone Ud. ¿Podría _____ dónde queda un quiosco?" "Sí. Hay uno en esta calle, a una cuadra de aquí." a. indicarme b. seguirme c. perdonarme d. comprarme "Pardon me. Could you _____ where a news stand is located? "Yes. There is one on that street, at

    asked by y912f on June 2, 2009
  37. Algebra 1

    An airplane travels 6200 km against the wind in 8 hours and 7080 km with the wind in the same amount of time. What is the rate of the plane in still air and what is the rate of the wind?

    asked by joe on December 21, 2012
  38. geometry

    A point is moving in a plane in such a way that its distance from the point(3,0)is 1.5 times its distance from the straight line 3x-4=0.find the louces of the point and identify the conic.

    asked by Anonymous on February 3, 2013
  39. algebra

    An airplane flies from City A in a straight line to City B, which is 70 kilometers north and 140 kilometers west of City A. How far does the plane fly?

    asked by Anonymous on September 16, 2011
  40. Physics

    vector r and s lie on an xy plane. magnitudes of 4.5 and 7.25, respecectively directions are 320 degrees and 685 degrees. What is vector r cross product of vector s?

    asked by Kyle on September 16, 2015
  41. Physics 2

    A beam of light is incident on a plane mirror at an angle of 35¨¬. If the mirror rotates through a small angle ¥è through what angle will the reflected ray rotate

    asked by Steve on February 21, 2014
  42. Science

    A force of 750 N keeps a 70-kg pilot in circular motion if he is flying a small plane at 35m/s in a circular path.What is the radius of the circular path?

    asked by Ailyn on June 29, 2017
  43. Biology(Anatomy&Physiology)

    1)Which group of organic molecules makes up your genetic code 2)A substance which tends to resist a change in the pH of a solution is called a 3)Which buffers is the most common in the body 4)Which of molecules is primarily made of CHON 5)Which is the

    asked by Stephanie on October 15, 2008
  44. physics

    box full of books rests on a wooden floor. The normal force the floor exerts on the box is 235 N. a) You push horizontally on the box with a force of 121 N, but it refuses to budge. What can you say about the coefficient of static friction between the box

    asked by mayrel on February 17, 2011
  45. Physics

    2 Dimensional Motion-Kinematics QS 1: An airplane wishes to travel 800 km northeast of a starting point. There is a wind blow towards the east at 100km/h. Assuming the maximum speed of the plane in still air is 500km/h, a: what course should the pilot

    asked by mack on September 12, 2017
  46. physics

    A mass m1 = 10 kg on top of a rough horizontal table surface is connected by a massless cable over a frictionless wheel to a hanging mass m2 = 5 kg, as shown in the previous problem. In m2 falls 1 m from rest in 1.2 seconds, find the co-efficient of

    asked by kim on October 8, 2012
  47. Physics

    A 2.75kg block of copper at 22C dropped into 5.25kg of water at 12.0C. What is the final temperature of the mixture? Specific heat: water = 4.19J/kgK copper = 390J/kgK

    asked by Tsunayoshi on February 6, 2014
  48. Math

    Shelly sews a blanket that has an area of 170 square feet. It has 30 square blocks, each the same size. What is the approximate length of each side of a block? A. 1 foot B. 2 feet C. 3 feet D. 4 feet Is the answer B? Thank you

    asked by Laura Ashley on November 3, 2014
  49. Physics

    There is a block of ice which weighs 1.0 kg, and has a temperature of 0 degree Celsius. How much heat will it take to melt and evaporate the ice in a room where there is plenty of ventilated cool, dry air at just above 0 degree Celsius.

    asked by Jacob K on December 11, 2011
  50. Physics

    1 kg block of ice at 0 degrees celsius placed in cooler. How much heat will the ice remove as it melts to water at 0 degree celsius. I know the answer is 80kcal but don't know the math that backs up the answer-please help!

    asked by Mary on June 30, 2009
  51. MATH

    If the volume of a cylindrical block is equal to 800cm^3 prove that the total surface area is equal to 2(pi)x^2 + (1600)/x, where x cm is the radius of the base. hence obtain the value x which makes the surface area a minimum

    asked by Grace on December 1, 2016
  52. physics

    A COPPER BLOCK ,MASS 500g AND AT 200 DEGREES CELCIUS GIVES OUT ENERGY AT AN AVERAGE RATE OF 50W. (i)what is temperature after 5 min ? (ii)how long will it take before its temperature drops to 50 degrees celcius

    asked by keheze on March 10, 2010
  53. Science

    I'm supposed to fill in a table. The angle of incedence in air is given (starting with zero degrees and then at 10, 20, 30, 40, 50 and 60 degrees. Using the sin function on my calculator, I'm supposed to figure out the angle of refraction in an acrylic

    asked by Iza on December 17, 2013
  54. Science

    An elastic cord of elastic constant k and length L is hung from point A having a massless block at the other end. A smooth ring of mass M falls from point A. What is the maximum elongation of cord?

    asked by sam on February 16, 2015
  55. Maths

    If the volume of a cylindrical block is equal to 800cm^3 prove that the total surface area is equal to 2(pi)x^2 + (1600)/x, where x cm is the radius of the base. hence obtain the value x which makes the surface area a minimum.

    asked by Dave on January 4, 2017
  56. math

    If the volume of a cylindrical block is equal to 800cm^3 prove that the total surface area is equal to 2(pi)x^2 + (1600)/x, where x cm is the radius of the base. hence obtain the value x which makes the surface area a minimum.

    asked by matt on April 17, 2012
  57. Chemistry

    A sample weighing 3.064 g is a mixture of Fe2O3 (molar mass = 159.69) and Al2O3 (molar mass = 101.96). When heat and a stream of H2 gas is applied to the sample, the Fe2O3 reacts to form metallic Fe and H2O(g). The Al2O3 does not react. If the sample

    asked by Chris on October 29, 2012
  58. Physics

    A 480 N man is standing on a 120 N pole supported by 2 blocks. The pole is 6 m long. One block is at the end while the other is 2 m away from the center. Where should the 480 N man stand?

    asked by Patrick on July 12, 2015
  59. physics

    which requires more energy, increasing the temperature of a 1kg block of aluminum by 20 degrees celsius or raising the temperature of 500g of water by 5 degrees celsius

    asked by Anonymous on July 27, 2008
  60. Chemistry

    A block of aluminum with a volume of 98.5 cm3 absorbs 67.4 J of heat. If its initial temperature was 32.5 °C, what is its final temperature? (density of aluminum = 2.70 g/cm3) I do not understand how to get the answer

    asked by Mon on February 26, 2013
  61. Chemistry

    A block of aluminum with a volume of 98.5 cm3 absorbs 67.4 J of heat. If its initial temperature was 32.5 °C, what is its final temperature? (density of aluminum = 2.70 g/cm3) I do not understand how to get the answer

    asked by Mon on February 26, 2013
  62. Physics

    The method by which the Mars exploration rovers, Spirit and Opportunity, landed on the surface of Mars in January of 2004 was quite elaborate. The rovers began their descent through the thin Martian atmosphere on a parachute until they reached an altitude

    asked by Frances on September 7, 2007
  63. Math

    Water spraying from a large fountain follows a path modeled by the function h(d) = -2/3d^2+ 4d, for h > 0, where h is the height of the water above the fountain jet and d is the horizontal distance of the water from the fountain jet, both in metres. a)

    asked by Alex on November 3, 2014
  64. physics

    For tests using a ballistocardiograph, a patient lies on a horizontal platform that is supported on jets of air Because of the air jets, the friction impeding the horizontal motion of the platform is negligible. Each time the heart beats, blood is pushed

    asked by Anonymous on March 27, 2014
  65. Physics

    a Particle in x-y plane with const acceleration of 1.5m/s sq. in the direction making an angle 37degree with x_axis. At t=0 the particle is at origin and its velocity is 8m/s along x axis.Find the velocity and the position of the particle at t=4sec.

    asked by Ramakanth on August 1, 2016
  66. algebra

    Flying with the wind, a pilot flew 600 mi between two cities in 4 h. The return trip against the wind took 5 h. Find the rate of the plane in calm air and the rate of the wind. Please show work. thanks

    asked by PLEASE NEED HELP on March 29, 2012
  67. Math

    Any 2 points determine a line. If there are 6 points in a plane, no 3 of which lie on the same line, how many lines are determined by pairs of these 6 points? The answer key says 15, and the explanation is (6!)/(2!4!). Could someone explain to me why there

    asked by Beth on September 21, 2015
  68. calculus

    An artificially created lake is bordered on one side by a straight dam. The shape of the lake surface is that of a region in the xy-plane bounded by the graphs of 2y=16-x^2 and x+2y=4. Find the area of the surface of the lake.

    asked by Akki on February 17, 2015
  69. physics

    An airplane traveling at v = 163 m/s emits a sound of frequency 1730 Hz. At what frequency does a stationary listener hear the sound as the plane approaches? Use 340 m/s for the speed of the sound and answer in Hz.

    asked by May on December 1, 2014
  70. physics

    An airplane traveling at v = 152 m/s emits a sound of frequency 1850 Hz. At what frequency does a stationary listener hear the sound as the plane approaches? Use 340 m/s for the speed of the sound and answer in Hz.

    asked by Annie on December 3, 2014
  71. Physics help

    A plane flies 230 mph at 60 degrees north of west for 2.5 hours. Answer the following questions. A. How far did it travel total? B. How far west did it go? C. How far north did it go? D. How fast did it go west? I don't know how to do this problem :(

    asked by Hannah on October 20, 2015
  72. physics

    A plane sound wave propagated in air has individual particles which execute a periodic motion such that their displacement y from their rest position at any time t is y=5x10^(-6)sin(800pie(t)+theta). Calculate (i) wavelength. (ii) phase diff in degree

    asked by Edwin on March 22, 2010
  73. Physics

    A square loop,circular loop prepared from a straight wire of length L are moved out of a uniform magnetic field,acting normal to the plane of the paper at a constant velocity v.Draw the variation of induced emf with time for both the loops. How will the

    asked by Raj on December 2, 2016
  74. physics

    A small turbo-prop commuter airplane, starting from rest on a Tallahassee airport runway, accelerates for 21.0 s before taking off. Its speed at takeoff is 56.0 m/s (125 mi/hr). Calculate the acceleration of the plane, assuming it remains constant. Express

    asked by Lo on January 9, 2011
  75. Physics

    A light, rigid rod 1.039m in length joins two particles with masses 3.65kg and 4.94kg at its ends. The combination rotates in the xy plane about a pivot through the centre of the rod. Determine the angular momentum of the system about the origin when the

    asked by Helen on July 5, 2016
  76. Chemistry

    The piperazine content of an impure commercial material can be determined by precipitating and weighing the diacetate: (C2H4)2N2H2 + 2 CH3COOH → (C2H4)2N2H2(CH3COOH)2 In one experiment, 0.3126 gram of the sample was dissolved in 25 mL of acetone, and 1

    asked by Tom on August 23, 2014
  77. Physics

    You take a 10 N block and lift it 1 meter vertically from the floor and then place it back down on the floor. How much work do you do during this motion? W = F x d x cos(theta) So lifting it does work and the lowering it does negative work won't that

    asked by Macy on July 1, 2014
  78. physics

    A 10 cm long, 2cm wide wooden wedge is pushed into a soft wood block.calculate: a) the velocity ratio of the wedge b) the load on the soft wood if the effort applied is 30N

    asked by Huseen on April 14, 2018
  79. Physics

    Suppose a block of mass of lead of mass 0.4kg at temperature 95°C is dropped in 2kg of water originally at 20°C in a container.calculate the final temperature if no heat is lost to the container and environment;

    asked by Timothy on March 22, 2018
  80. Physics 11

    SPH3U1 Two blocks of mass 500.0 g and 200.0 g are suspended vertically as shown in the diagram. The top string is lifted vertically upwards with a force of 8.48N on the 500.0 g Block (sorry no diagram) Thank you very much for your help

    asked by Andy on October 15, 2009
  81. chemistry

    which of the following is true regarding the inner transition elements? A. their valence electrons can be located in both s and f sublevels B. They occupy the d block of the periodic table C. These include the lanthanides and actinides and do not have f

    asked by Yui on September 15, 2014
  82. physics

    A block and tackle system of 5 pulleys is used to raise a load of 50kg through a height of 20m the work done against friction is 200J.Calculate the work done by effort,the efficiency of the system and the effort applied.

    asked by Mohamedy on June 25, 2016
  83. Physics

    A block of mass 0.65 kg and density 650 kg/m³ is forced under the surface of the water by means of a spring (k = 60.0 N/m) that is fixed to the bottom of the container as shown in the figure. How much is the spring stretched? (the density of water is 1000

    asked by Rutgers on April 9, 2015
  84. Algebra

    I've been working on this for an hour and I know it's more simple than I'm making it. Please enlighten me. Cyclist 1 is traveling at 20 mph, Cyclist 2 is traveling at 14 mph. How long before they're 15 miles apart? I've tried to fill in a block diagram and

    asked by Brian on October 19, 2008
  85. physics

    A bullet of mass ‘m’ traveling horizontally at a speed ‘v’ embeds itself in the centre of a block of wood of mass ‘M’, which is suspended by a light vertical string of length ‘l’. What would be the maximum inclination of the string with the

    asked by Sandhya on June 16, 2009
  86. Physics

    A uniform door (0.81 m wide and 2.1 m high) weighs 122 N and is hung on two hinges that fasten the long left side of the door to a vertical wall. The hinges are 1.5 m apart. Assume that the lower hinge bears all the weight of the door. (a) Find the

    asked by Pierce on April 4, 2008
  87. Algebra 2

    A stunt motorcyclist makes a jump from one ramp 20 feet off the ground. The jump between ramps can be modeled by y= -1/640x^2 + 1/4x +20 where x is the horizontal distance (in feet) and y is the height above ground (in feet). I think a is 20 feet, but I

    asked by Krystal on September 24, 2013
  88. math

    A stunt motorcyclist makes a jump from one ramp 20 feet off the ground. The jump between ramps can be modeled by y= -1/640x^2 + 1/4x +20 where x is the horizontal distance (in feet) and y is the height above ground (in feet). I think a is 20 feet, but I

    asked by Joel on September 24, 2013
  89. Physics Classical Mechanics

    A yo-yo of mass m rests on the floor (the static friction coefficient with the floor is μ). The inner (shaded) portion of the yo-yo has a radius R1, the two outer disks have radii R2. A string is wrapped around the inner part. Someone pulls on the string

    asked by A on November 7, 2013
  90. Vector

    Let 𝑎⃗ and 𝑏 be two vectors in the xy plane making angles 𝜃 and ∅ with the x axis, respectively. Use vector algebra to show that: cos(𝜃 − ∅) = cos 𝜃 cos ∅ + sin 𝜃 sin ∅

    asked by HelpMaths on September 23, 2014
  91. physics

    a butterfly at eye level is 20 cm in front of a plane mirror. you are behind the butterfly, 50 cm from the mirror. what is the distance between your eyes and the image of the buterfly in the mirror?

    asked by na on October 31, 2009
  92. Algebra

    Let A(4,3) B(5,8) and C(3,10) be three points in a coordinate plane. Find the coordinates of a point D such that the points ABC and D form a parallelogram with (a)AB as one of the diagonals (b)AC as one of the diagonals (c)BC as one of the diagonals

    asked by Amanda on September 18, 2011
  93. Physics

    Vectors A and B are in the xy plane and their scalar product is 20.6 units.? If A makes a 27.8 angle with the x axis and has magnitude A= 14.8 units, and B has magnitude B= 29.0 units, what can you say about the direction of B?

    asked by Emma on November 17, 2012
  94. SCIENCE

    a force of 70N keeps a 70-kg pilot in circular motion if he is flying a small plane at 35 m/s in circular path, what is the radius of the circular path?

    asked by ace ponce on July 5, 2014
  95. maths

    r1 and r2 are unit vectors in the x-y plane making angles a and b with the positive x-axis.by considering r1.r2 derive cos(a-b)=cos(a)cos(b)+sin(a)sin(b)

    asked by ashely on February 11, 2012
  96. physics

    A thin, light horizontal string is wrapped around the rim of a 4.00-kg solid uniform disk that is 30.0 cm in diameter. A box is connected to the right end of the string and moves to the right along the ground horizontally with no friction. The box is

    asked by toby on December 4, 2012
  97. Physics

    A uniform 160 N ladder rests against a perfectly smooth wall, making a 70 degree angle with the wall (ladder is 7 m long). (a) find the normal forces that the wall and the floor exert on the ladder. B) what is the friction force on the ladder at the floor?

    asked by Adolfo on January 26, 2016
  98. Math

    [Multivariable Calc] Let R be the region that is inside of the cardioid r=2 + cos(theta) and outside the circle r=2? So i need to calculate the: *area of R, as well as *the volume above R and below plane z=12-3x *the density of that solid if the density

    asked by Ryan on November 28, 2015
  99. Physics

    A proton follows a spiral path througha gas in a magnetic field of .010 T , perpendicular to the plane of the spiral.In two successive loops, at point P and Q, the radii are 10.0mm and 8.5 mm,respectively.Calculate the change in Kinetic energy of the

    asked by jenish on March 2, 2008
  100. math

    F(x,y) represents a velocity field of a fluid over a surface z=6-3x-2y.If the magnitude of the velocity in the direction of the unit normal vector,n on S is 3z/(surds14), compute the flux of F(x,y) over the surface S in the first octant oriented upward

    asked by Adam on December 10, 2016