1. Physics

    A bar of aluminum (bar A) is in thermal contact with a bar of iron (bar B) of the same length and area. One end of the compound bar is maintained at Th = 75.5°C while the opposite end is at 30.0°C. Find the temperature at the junction when the energy
  2. physics

    if theta is the angle between unit vectors A bar and B bar, then (1-A bar.B bar)/(1 plus A bar.B bar) is equal to
  3. Vector , physics

    In a regular hexagon ABCDEF prove that AB bar+AC bar +AD bar+AE bar+AF bar =6AO bar
  4. Physics

    A bar of gold is in thermal contact with a bar of silver of the same length and area. One end of the compound bar is maintained at 80.0°C while the opposite end is at 30.0°C. When the energy transfer reaches steady state, what is the temperature at the
  5. physics

    Suppose we wish to use a 4.0 m iron bar to lift a heavy object by using it as a lever. If we place the pivot point at a distance of 0.5 m from the end of the bar that is in contact with the load and we can exert a downward force of 640 N on the other end
  6. PHYSICS

    There's a bar with length of 6.49m and mass of 5.45kg leaning against a frictionless wall. It makes an angle of 66.08 deg with the ground. A block with mass of 44.98 kg hangs from bar at distance d up from point of contact between bar and floor. The
  7. physics

    Hello everyone, I need help with this question: A bartender slides a glass of beer down a bar with an initial velocity of 2m/s. The coefficient of kinetic friction of the bar is 0.05 and the length of the bar is 3m and the height of the bar is 1m. The mas
  8. physics

    The drawing shows a 156-kg crate hanging from the end of a steel bar (S = 8.1 x 1010 N/m2). The length of the bar is 0.117 m, and its cross-sectional area is 7.44 x 10-4 m2. Neglect the weight of the bar itself and determine (a) the shear stress on the bar
  9. physics

    a uniform bar of mass is supported by support pivoted at top about which bar can swing like simple pendulum. If force F is applied perpendicular to lower end of the bar.How big F must be in order to held the bar in equilibrium.
  10. Physics

    A 60-cm-long, 500 g bar rotates in a horizontal plane on an axle that passes through the center of the bar. Compressed air is fed in through the axle, passes through a small hole down the length of the bar, and escapes as air jets from holes at the ends of
  11. physics

    bar subjected to gravity load (two segments) the bar in the fig has constant cross sectional area A .the top half of the bar is made of material with mass density and youngs module, the bottom half of the bar made of density and young module total length
  12. physics

    bar subjected to gravity load (two segments) the bar in the fig has constant cross sectional area A .the top half of the bar is made of material with mass density and youngs module, the bottom half of the bar made of density and young module total length
  13. physics

    bar subjected to gravity load (two segments) the bar in the fig has constant cross sectional area A .the top half of the bar is made of material with mass density and youngs module, the bottom half of the bar made of density and young module total length
  14. Physic

    The composite bar BCD in the figure is composed of an inner aluminum cylindrical core of length 2L=2 m and radius R=1 cm, and a sleeve of steel of length L=1 m and thickness R=1 cm surrounding the aluminum core in the CD section of the bar. The bar is
  15. Physics

    Tapered bar with end load The small tapered bar BC has length L=0.1 m and is made of a homogeneous material with Young’s modulus E=10 GPa. The cross sectional area of the bar is slowly varying between A0=160 mm^2 (at B) and A0/2 (at C), as described by
  16. Physics

    A 30m bar with a mass of 20kg is being lifted by a string. The bar makes an angle of 55 degrees above horizontal (between the bar and ground). The string is attached to the ceiling vertically. What is the tension on the string? What is the normal force
  17. Physics

    65 kg pole vaulter running at 10.2 m/s vaults over the bar. if height of bar was set at 4.96 m how fast was he moving as he cleared the bar
  18. physic

    The composite bar BCD in the figure is composed of an inner aluminum cylindrical core of length 2l=2m and radius R=1cm and a sleeve of steel of length L=1m and thickness R=1cm surrounding the aluminum core in the CD section of the bar. The Young’s moduli
  19. Physics

    Composite bar with end load (two segments) The composite bar BCD in the figure is composed of an inner aluminum cylindrical core of length 2L=2 m and radius R=1 cm and a sleeve of steel of length L=1 m and thickness R=1 cm surrounding the aluminum core in
  20. math

    The cost of a X chocolate bar is $3.50. The cost of a similar Y bar is $3.20. (a) Find the percentage saving in buying a Y bar instead of the X bar. (b) Find the percentage loss in buying a X bar instead of the Y bar. Please help...........
  21. Physics

    A uniform bar of iron is supported by a lon, uniform Hooke's Law spring. The spring is cut in half exactly and the two pieces are used to support the same bar. If the whole spring is stretched by 4 cm in the first bar (that is not cut in half) how much
  22. Physics

    A bar of length 2L can rotate about a frictionless axle at its center. The bar is initially at rest and is then acted on by the three forces shown. What is the magnitude of the net torque on the bar?
  23. science

    A 30-g iron bar at 100degreeC is placed in 200 g of water at 20degreeC. If the specific heat capacity of iron is 0.11 cal/gdegreeC, to what final temperature will the iron bar cool?
  24. Physics

    A 5.80 kg ball is dropped from a height of 14.5 m above one end of a uniform bar that pivots at its center. The bar has mass 9.00 kg and is 6.40 m in length. At the other end of the bar sits another 5.30 kg ball, unattached to the bar. The dropped ball
  25. vector mechanics- dynamics

    The slender bar AB weights 8 kg and moves in the xy plane, with its ends constrained to follow the smooth horizontal and vertical guides as shown in Figure Qi. By assuming the bar AB is initially at rest; a) Calculate the angular acceleration of the bar.
  26. Physics

    On a frictionless table, a glob of clay of mass 0.54 kg strikes a bar of mass 1.24 kg perpendicularly at a point 0.27 m from the center of the bar and sticks to it. 1. If the bar is 1.02 m long and the clay is moving at 6.3 m/s before striking the bar,
  27. Mechanics _ physics

    A uniform bar 1m long is pivoted at the centre has a mass of 3kg. It is acted upon by a conquer which cause to possess an angular acceleration of 6rad/sec^2; calculate a. The moment of inertia of the bar b. The torque on the bar
  28. probabilty

    Smitty's Bar and Grill has brand name recognition of 61% around the world. Assuming we randomly select 2 people. The assumptions of a Bernoulli process are met. What is the probability a)exacatly 5 of the 12 recognize the name of Smitty's Bar and Grill?
  29. Physics

    A "Bus" bar is in the form of a slab of copper 2meters long, 1cm wide, and 10 cm thick. a) What is the resistance of the bar at 0 degrees celcius? b) What potential difference is needed to push 5000 amps through the bar?
  30. physics

    True or False? An iron bar has the same density as an aluminium bar that is twice as large
  31. Chemistry

    At 25 °C, the equilibrium partial pressures for the following reaction were found to be PA = 4.10 bar, PB = 5.60 bar, PC = 1.20 bar, and PD = 9.70 bar. 2A(g)+2B(g)-->C(g)+ 3D(g) What is the standard change in Gibbs free energy of this reaction at 25 °C.
  32. Physical Chemistry

    Take 3.00 mol of an ideal gas at Pi=25.0 bar, Vi=4.50L, and expand it isothermally. Calculate the work done in two different processes. a. Reversible expansion at Pf=4.50 bar b. Irreversible expansion at Pext=4.50 bar
  33. Physics

    A 51.8 kg pole vaulter running at 11.5 m/s vaults over the bar. Her speed when she is over the bar is 1.26 m/s. Neglect air resistance, as well as any energy absorbed by the pole, and determine her altitude as she crosses the bar
  34. physics

    A 42-kg pole vaulter running at 14 m/s vaults over the bar. Her speed when she is above the bar is 1.7 m/s. Neglect air resistance, as well as any energy absorbed by the pole, and determine her altitude as she crosses the bar.
  35. physics

    A 52-kg pole vaulter running at 12 m/s vaults over the bar. Her speed when she is above the bar is 0.7 m/s. Neglect air resistance, as well as any energy absorbed by the pole, and determine her altitude as she crosses the bar.
  36. thermodinamics

    2. A sample of an ideal gas underwent an expansion against a constant external pressure of 1.0 bar from 1.0 m3, 20.0 bar, and 273 K to 100.0 m3, 1.0 bar, and 273 K. What is the work done by the system on the surroundings
  37. Physics

    The bar in the figure has constant cross sectional area A. The top half of the bar is made of material "1" with mass density ρ1, and Young’s modulus E1. The bottom half of the bar is made of material "2" with density ρ2 and Young’s modulus E2=2E1.
  38. Physics

    The bar in the figure has constant cross sectional area A. The top half of the bar is made of material "1" with mass density ρ1, and Young’s modulus E1. The bottom half of the bar is made of material "2" with density ρ2 and Young’s modulus E2=2E1.
  39. Physics

    A small 0.13 g bug stands at one end of a thin uniform bar that is initially at rest on a smooth horizontal table. The other end of the bar pivots about a nail driven into the table and can rotate freely, without friction. The bar has mass 0.3 g and is
  40. mechanics

    An aluminum alloy bar with a Young's modulus of 70GPa is under a tensile stress of 10MPa, Which of the following is the equal to the strain in the bar? A 0.0014 B 7.0x103 c 700 D 1.4x10-4
  41. Physics

    A uniform bar length of 2.0m and weight 1000 N has its center of gravity at its center. The bar is pivoted 0.5m from the right, and supports a weight of 200N on the opposite end (left end). What is the weight needed at right end of the bar to balance the
  42. Physics

    a 100 g iron bar at 100 C is placed in 200 g of water at 20 C. If specific heat of iron is 0.11 cal/G*c to what final temperature will the iron bar cool?
  43. Physics

    a 100 g iron bar at 100 C is placed in 200 g of water at 20 C. If specific heat of iron is 0.11 cal/G*c to what final temperature will the iron bar cool?
  44. physics

    A nonuniform, horizontal bar of mass 3.43 kg is supported by two massless wires against gravity. The left wire makes an angle 21.9 degrees, with the horizontal, and the right wire makes an angle 61.8 degrees. The bar has length 1.04 m. A) Find the position
  45. math

    Four friends shared a candy bar. The first friend ate 1/4 of the candy bar, the second friend ate 1/3 of the candy bar, and the third friend ate 1/6 of the candy bar. How much of the candy bar did the fourth friend eat? (Leave your answer as a fraction in
  46. physic

    The bar in the figure has constant cross sectional area A . The top half of the bar is made of material 1 with mass density ro1 , and Young’s modulus E1 . The bottom half of the bar is made of material 2 with density ro2 and Young’s modulus E2=2E1 .
  47. physics

    A uniform bar of length 12 m and mass 3 kg is attached to a wall with a hinge that exerts a horizontal force Hx and a vertiscal force Hy on the bar. The bar is held by a cord that makes a 90 degree angle with respect to bar and 43 degrees with respect to
  48. physics

    a 10.0m long bar is attached by a frictionless hing to a wall and held horizontally by a rope that makes an angle of 53 deg with the bar the bar is uniform and weights 39.9 N. how far from the hinge should a 10.0kg mass be suspended for the tension T in
  49. Statistics

    Sammy and Sally each carry a bag containing a banana, a chocolate bar, and a licorice stick. Simultaneously, they take out a single food item and consume it. The possible pairs of food items that Sally and Sammy consumed are as follows. chocolate bar -
  50. Physics - Tension Question

    A uniform bar of mass 12 kg and length 1.4 m is held by a hinge on a vertical wall. A string is attached to the end so that the bar is in mechanical equilibrium. The angle between the bar and the string is 25o. Find the tension in the string.
  51. Science

    A sliver bar 0.125 meter long is subjected to a temperature change from 200C to 100C.What will the length of the bar after the temperature change? See the aluminum question. I will be happy to critique your work and thinking. A silver bar 0.125 meter long
  52. Physics Classical Mechanics

    A bar of mass m and negligible height is lying horizontally across and perpendicular to a pair of counter rotating rollers as shown in the figure. The rollers are separated by a distance D. There is a coefficient of kinetic friction μk between each roller
  53. physics

    A non-uniform bar of weight W = 20.0 N is suspended at rest in a horizontal position by two massless cords. The angle phi between cord 2 and the vertical is equal to 32.5o. The bar has a length L = 6.5 m and the distance of its center of gravity from the
  54. PHYSICS

    A box is lifted with a pry bar, by slipping the bar under the box and lifting up on the bar. If the pry bar is 2m in length and it is grasped at the end, and the box is located at the opposite end, the fulcrum, with its center of gravity at a distance of
  55. PHYSICS

    A box is lifted with a pry bar, by slipping the bar under the box and lifting up on the bar. If the pry bar is 2m in length and it is grasped at the end, and the box is located at the opposite end, the fulcrum, with its center of gravity at a distance of
  56. Math

    Erika eat 1/3 of a chocolate bar and gave the remaining 2/3 of the chocolate bar to her 8 friends to share equally. How much chocolate bar will each friend get?
  57. PHYSICS please HELP

    A box is lifted with a pry bar, by slipping the bar under the box and lifting up on the bar. If the pry bar is 2m in length and it is grasped at the end, and the box is located at the opposite end, the fulcrum, with its center of gravity at a distance of
  58. science

    3. Hydrobromic acid dissolves solid iron according to the following reaction: Fe(s) + 2HBr(aq) ---> FeBr2(aq) + H2(g) What mass of HBr (in g) would you need to dissolve a 3.2 gram pure iron bar on a padlock? What mass of H2 would be produced by the
  59. MATH

    What is a bar graph? Here is an example of a bar graph http://www.google.com/search?hl=en&ie=ISO-8859-1&q=bar+graph&btnG=Google+Search the screen on a stereo is a bar graph
  60. chem

    At 298K, Go = -67.4 kJ for the reaction CO + Cl2 --> CoCl2 Calculate the change in Gibbs free energy (in kJ) at the same temperature when P (CO) = 0.368 bar, P (Cl2) = 0.62 bar and P (COCl2) = 0.872 bar. (R = 8.314 J/K mol)
  61. physics

    A 0.330 kg bar is placed on a pair of frictionless rails separated by a distance of 1.60 m and located on an inclined plane that makes an angle of 29.0° with respect to the ground. The total resistance of the circuit remains at a constant 1.8 Ω and a
  62. mechanical properties of materials

    A cylindrical steel bar is required to support a load of 650 N. the required bar must be 0.17 m in length and must not deform by more than 0.015 mm. given that the Young's modulus of steel is 210 GPa, calculate the minumum diameter of the bar.
  63. mechanical properties of materials

    A cylindrical steel bar is required to support a load of 650 N. the required bar must be 0.17 m in length and must not deform by more than 0.015 mm. given that the Young's modulus of steel is 210 GPa, calculate the minumum diameter of the bar.
  64. chemistry

    At 298K, Go = -141.8 kJ for the reaction 2 SO2 + O2 in equilibrium with 2 SO3 Calculate the change in Gibbs free energy (in kJ) at the same temperature when P (SO2) = 0.505 bar, P (O2) = 0.80 bar and P (SO3) = 1.317 bar. (R = 8.314 J/K mol)
  65. physics

    The brass bar and the aluminum bar in the drawing are each attached to an immovable wall. At 21.3 °C the air gap between the rods is 1.70 x 10-3 m. At what temperature will the gap be closed?
  66. physics

    The brass bar and the aluminum bar in the drawing are each attached to an immovable wall. At 29.0 °C the air gap between the rods is 1.93 x 10-3 m. At what temperature will the gap be closed?
  67. Chem

    A 1.00-mole sample of ammonia at 13.0 bar and 20°C in a cylinder fitted with a movable piston expands against a constant external pressure of 1.00 bar. At equilibrium, the pressure and volume of the gas are 1.00 bar and 22.0 L, respectively. a) calculate
  68. math

    A jeweler is heating a gold bar. It takes 7 joules of heat to raise the temperature of the bar 1°C. The initial temperature of the bar is 25°C. Use this information for Items 4–11. 4. Make a table that shows how many joules of heat would be required to
  69. math,

    A jeweler is heating a gold bar. It takes 7 joules of heat to raise the temperature of the bar 1°C. The initial temperature of the bar is 25°C. Use this information for Items 4–11. 4. Make a table that shows how many joules of heat would be required to
  70. algebra

    A jeweler is heating a gold bar. It takes 7 joules of heat to raise the temperature of the bar 1°C. The initial temperature of the bar is 25°C. Use this information for Items 4–11. 4. Make a table that shows how many joules of heat would be required to
  71. classical mechanics

    A bar of mass and negligible height is lying horizontally across and perpendicular to a pair of counter rotating rollers as shown in the figure. The rollers are separated by a distance . There is a coefficient of kinetic friction between each roller and
  72. Physic

    The built-in composite bar BC of length L=2 m is composed of two materials with equal cross sectional area A = 100 mm2. The first material has elastic modulus E=1 GPa. The second material is twice as stiff, with a modulus of 2E or 2 GPa. The bar is
  73. Chemistry

    Predict how the entropy of the substance is affected in the following processes: a) O2 (g,200 kPa, 300k) --> O2 (g, 100, 300k) b)Br2 (l, 1 bar, 25 degree C) --> Br2 (g, 1 bar, 25 degree C) C)Fe (s, 1 bar, 250 degree C)--> Fe(s, 1 bar, 25 degree C) will
  74. Physics

    Suppose gold bars are made such that they are cubic. If they are made cubic, then there volume is given by V = L3, where L is the length of a side of the bar. The price of any gold bar is directly proportional to its volume, so the price of the gold is P =
  75. Physics

    Suppose gold bars are made such that they are cubic. If they are made cubic, then there volume is given by V = L3, where L is the length of a side of the bar. The price of any gold bar is directly proportional to its volume, so the price of the gold is P =
  76. statistics

    I need to prove this σ(hat)^2(x,y) = (1/n) Σ (Xi - X (bar) ) Yi using σ(hat)^2(x,y)= (1/n) Σ (Xi - X(bar)) (Yi-Y(bar)) and X(bar)= (1/n) Σ Xi σ(hat)^2 (x,y) is the estimator of covariance
  77. physics

    Consider two straight bars of uniform cross section made of the same material. Bar 1 has an axial length of and a square cross section with side length . Bar 2 has an axial length of and a round cross section with diameter. When subjected to axial tension,
  78. chemistry

    A 210 g iron bar is heated and then placed in 100. g of water in an insulated container. The water temperature increases from 21.2 °C to 53.3 °C. What was the initial temperature of the iron bar? (Specific heats: cFe = 0.449 J/gK; cwater = 4.184 J/gK)
  79. PHYSIC

    The built-in composite bar BC of length L=2 m is composed of two materials with equal cross sectional area A = 100 mm2. The first material has elastic modulus E=1 GPa. The second material is twice as stiff, with a modulus of 2E or 2 GPa. The bar is
  80. Statistics

    Assume a population of any 4 numbers(suppose: 4,8,15,19). Select a random sample of size 2 with replacement from the population. List all the possible samples and their corresponding values of x̄ “x-bar” and then find the probability distribution of
  81. Physics

    A place kicker must kick the football from a point 34.2 m from the goal and clear a bar 3.00 m above the ground. The ball leaves the ground with a speed of 20.0 m/s at an angle of 53.0 degrees above the horizontal. (a) By how much (m) does the ball clear
  82. Physiscs

    A 3kg bar is laying on a smooth vertical wall of 3L of height and a floor of 2L. Determine the force that the wall exerts over the bar. I have tried to get to length of the bar by using Pitagoras but no, then I tried using a free body diagram but I don't
  83. Math

    Betty decides to support local artists by hanging their artwork in her shop. When decorating the coffee shop, Betty comes across the following formula for placing pictures on her walls: 1 third open vertical bar A-12 close vertical bar plus 2 over 3 open
  84. Physics

    A long straight horizontal bar vibrates in a ver tical direction with a frequency of 1.50 Hz on the surface of a large tank of water. The vibrations of the bar cause plan e waves to travel across the surface of the water. The waves are described by the
  85. Physics

    A bar with a mass of 20kg with a length of 30m is being lifted by a string and makes an angle of 55 degrees. The string is attached to the ceiling vertically. What is the tension on the string? What is the normal force given by the bar on the string what
  86. Physic

    Reaction at support and internal axial force resultant Consider two straight bars of uniform cross section made of the same material. Bar 1 has an axial length 1m of and a square cross section 1mm with side length . Bar 2 has an axial length of 3 m and a
  87. psuchics

    Reaction at support and internal axial force resultant Consider two straight bars of uniform cross section made of the same material. Bar 1 has an axial length 1m of and a square cross section 1mm with side length . Bar 2 has an axial length of 3 m and a
  88. physics

    A bar made of a particular metallic alloy has a length of 10 cm at a temperature of 24 oC and a length of 10.015 cm at the boiling point of water. (a) If a second bar made of the same material were 10 m at 24 oC, how much longer would this bar be at the
  89. physics help

    A bar made of a particular metallic alloy has a length of 10 cm at a temperature of 24 oC and a length of 10.015 cm at the boiling point of water. (a) If a second bar made of the same material were 10 m at 24 oC, how much longer would this bar be at the
  90. Physic

    A bar has a constant cross sectional area A. The bar is devided in 2 segments segment 1 (1/3 of the bar) and segment 2 (2/3 of the bar). Segment 1 is made of a material with mass density ρ and Young's modulus E. Segment 2 is made of a different material,
  91. Science

    Hurricane Katrina, which hit the Gulf Coast of Louisiana and Mississippi on August 29, 2005, had the second lowest ever recorded barometric pressure at 920mb. Convert this pressure to units of atmospheres, and inches of Hg. 1 bar = 0.98692 atm 0.92 bar =
  92. Math

    Let x represent the number which shows up when a balanced die is rolled. Then x is a random variable with a uniform distribution. Let x-bar denote the mean of the numbers obtained when the die is rolled 32 times. For samples of size 32, which of the
  93. Calculus I

    Suppose we have a metal bar of length L0 metres at temperature T0 in degrees Celsius.When the bar is heated or cooled, the length of the bar changes. The amount that the length changes is proportional to the product of the temperature change and the
  94. Probability

    Could someone please check this and let me know if I'm doing it correctly? Sammy and Sally each carry a bag containing banana, chocolate bar, and a licorice stick. Simutaneously, they take out a single good item and consume it. The possible food items that
  95. electricity

    if a bar of copper is brought near a magnet, the copper bar will be? A)attracted by the magnet. B)unaffected by the magnet. C)repelled by the magnet. D)made into an induced magnet. B)unaffected by the magnet. Actually there is a very slight repulsn due to
  96. Physics

    A horizontal uniform bar of mass 2.6kg and length 3.0m is hung horizontally on two vertical strings. String 1 is attached to the end of the bar, and string 2 is attached a distance 0.65m from the other end. A monkey of mass 1.3kg walks from one end of the
  97. physics

    A steel bar of length L=2 m, with modulus E=200 GPa and constant cross sectional area A=200 mm2 is constrained between two walls at its two ends A and B. A distributed axial load, fx(x)=−p0(1−3x2L), with p0=200 kN/m, is applied to the bar only in the
  98. Physic

    A steel bar of length L=2 m, with modulus E=200 GPa and constant cross sectional area A=200 mm2 is constrained between two walls at its two ends A and B. A distributed axial load, fx(x)=−p0(1−3x2L), with p0=200 kN/m, is applied to the bar only in the
  99. Algebra

    Evaluate fraction numerator open vertical bar a minus 16 b close vertical bar over denominator open vertical bar a plus b close vertical bar end fraction when a = -10 and b = 3
  100. Physics

    The figure below shows a standard man intending to do reverse curls in a gym (standing up with Tension up, weight of arm down and force down). He holds his arms straight, using an overhand grip to hold the bar. If the mass of the bar is given as 146 kg,