1. physics

    A flywheel with a diameter of 1 m is initially at rest. Its angular acceleration versus time is graphed in the figure. (a) What is the angular separation between the initial position of a fixed point on the rim of the flywheel and the point's position 8 s after the wheel ...
  2. Physics

    A thin rod (length = 1.03 m) is oriented vertically, with its bottom end attached to the floor by means of a frictionless hinge. The mass of the rod may be ignored, compared to the mass of the object fixed to the top of the rod. The rod, starting from rest, tips over and ...
  3. physics

    a brick is dropped form the roof of a building. On the way down it passes a 2m high window and is observed to pass from the top to the bottom of the window in 0.25s. (a) How fast was it moving when it passed the top of the window? (b)How far below the roof of the building is ...
  4. 10th grade

    how do you calculate the volume of the aluminum block from the apparent change in the volume of water in the cylinder?
  5. maths

    from a point on the ground the angle of elevation of the bottom and top of a flagstaff situated on top of a 120 m tall house is 30 and 45 degrees respectively.find the height of the flagstaff.
  6. physics

    A flywheel with a diameter of 1 m is initially at rest. Its angular acceleration versus time is graphed in the figure. (a) What is the angular separation between the initial position of a fixed point on the rim of the flywheel and the point's position 8 s after the wheel ...
  7. physics angular velocity

    A 20g steel weight is placed on the edge of 1 30cm diameter plastic disk. The coefficient of static friction between the steel weight and plastic disk is 0.4. At what angular velocity will the weight slide off the disk?
  8. physic

    Hi! help me please, Thank you. A spherical steel ball bearing has a diameter of 2.540 cm at 23°C. (a) What is the diameter when its temperature is raised to 94°C? cm (b) What temperature change is required to increase its volume by 0.9%? I only need help on part b.Thank
  9. Engineering skill

    anybody here to give me notes to solve this question (A and B are two points on a pipe of diameter 600 mm. the grid reference for the two points are given in the below , together with the elevation of the top of the pipe at these points. A drain pipe is being planned, and P ...
  10. Physics

    A pair of constant forces of magnitude F = 11.1 N is applied to opposite sides of the axle of a top, as shown in the figure. The diameter of the axle is d = 8.67 mm. The angle è, which has a value of 36.1°, describes the steepness of the top's sloping sides. The moment of ...
  11. math,algebra

    Directions:Multiply (-1/2)(-3/8) mY ANSWER : .1875 Now how do i turn this into a fraction. numerator multiplied: 3 denominator multiplied 16 3/16 How do you get to that answer because not every single one would be multiplied by the numerator 3. Can you explain to me how to ...
  12. Math

    Can you explain how to do this question? "Three clocks ring once at the same time. After that, the first clock rings after every 90 minutes, the second after every 30 minutes, and third after every 60 minutes. After how many minutes will they again ring together?
  13. physics

    What is the apparent weight of a 25kg lead block submerged in the dead sea? (density of dead sea is 1240kg/m3)
  14. Math for Steve or someone good at math

    1. Find the percent of change when the price of a radio changes from $40.00 to $44.00. a. 12% b. 10% c. 36.4% d. 40% 2. Find the percent of change when the price of an oven changes from $450 to $396. a. 15% b. 14% c. 13% d. 12% 3. The top player’s scoring average changes ...
  15. physics

    An air bubble at the bottom of a lake 35.0 m deep has a volume of 1.88 cm^3. If the temperature at the bottom is 5.4 C and at the top 19.5 C, what is the volume of the bubble just before it reaches the surface?
  16. physics

    The justice league is playing baseball with 5kg rockets. The flash's top speed is 300m/s and a home run requires a 180m run. The rockets accerlate at 1200m/s^2, Superman catches it 30m from home, and decelerates it with 2700N. Once he stops the rocket, he applies a 2700N force...
  17. physics

    A cart released from rest at the top of a track 90. cm long takes 4.00 seconds to reach the bottom. determine the velocity as the cart reaches the bottom of the track
  18. Physics

    Two loudspeakers are mounted on a merry-go-round whose radius is 9.68 m. When stationary, the speakers both play a tone whose frequency is 132 Hz. As the drawing illustrates, they are situated at opposite ends of a diameter. The speed of sound is 343.00 m/s, and the merry-go-...
  19. microeconomics

    . Suppose that two players are playing the following game. Player 1 can choose either Top or Bottom, and Player 2 can choose either Left or Right. The payoffs are given in the following table: Player 2 Player 1 Left Right Top 9 4 2 5 Bottom 1 0 3 1 Where the number on the left...
  20. Physics

    A raft is made of 15 logs lashed together. Each is 30.0 cm in diameter and has a length of 7.00 m. How many people (whole number) can the raft hold before they start getting their feet wet, assuming the average person has a mass of 66.0 kg? Do not neglect the weight of the ...
  21. Physic

    An electric motor rotating a workshop grinding wheel at a rate of 114 rev/min is switched off. Assume the wheel has a constant negative angular acceleration of magnitude 2.10 rad/s2. (a) How long does it take for the grinding wheel to stop?
  22. Physics

    Twelve uniform, thin rods of mass M and length L are welded together to form a hexagon "wheel." What is the moment of inertia of this wheel for rotation around an axis through its center and perpendicular to the plane of the wheel? (The welds contribute no mass)
  23. Physics

    A block is on the end of a massless cable that is tied to a frictionless wheel (uniform disk) as shown in the figure at right. The wheel has a radius of 0.4 m. The system is initially at rest. If the block moves downward, with a constant acceleration, a distance of 2 m in 3 s...
  24. Physics

    The figure shows the velocity graph of a 79kg passenger in an elevator. The graph is (0,0),(1,4),(5,8),(9,2) What is the passenger's apparent weight at t=1s,5s,9s?
  25. Math

    Find the average rate of change in height of the orange from t=2 to t=5 (in feet per second) The equation is h (t)=605+15t-4.9t^2 in feet. I know the the average rate of change is change in q/ change in time. Do I put t=3 and subtract the quantity of 5 and 2 in the formula for...
  26. Physics

    You have a brass ring of inside diameter 10.00 cm that is at 20.0oC. You want to slip this ring over an aluminum rod that is at 20.0oC and has a diameter of 10.01 cm. a. To what temperature do you have to heat the ring to slip it over the rod? b. Once you have the ring over ...
  27. physics

    A large grinding wheel in the shape of a solid cylinder of radius 0.330 m is free to rotate on a frictionless, vertical axle. A constant tangential force of 210 N applied to its edge causes the wheel to have an angular acceleration of 1.161 rad/s2. (b) What is the mass of the ...
  28. math Question

    classify the triangle by its angles and its sides. Explain how you knew which classifications to use. top of the triangle is 70 degrees, bottom right is 45 degrees and bottom left is 65.
  29. physics

    a rectangular barge with a flat bottom, has an area at the bottom of 4m squared. the weight of the barge plus its cargo is 5,000 newtons. what is the mass of the barge + cargo in kilograms?
  30. Physics

    Rotating initially at 1800 rpm, a wheel with a diameter of 74.0 cm is brought to rest in 11.0 s. Calculate the magnitude of its angular acceleration in radians/second^2
  31. Math

    A bicycle with 26inch diameter wheels is travelingat 10 mph. To the nearest whole number how may revolutions does each wheel make per minute?
  32. Physics

    A potter’s wheel with rotational inertia 24 kg m2 is spinning freely with no friction at 50 rpm. A piece of clay is dropped from above the wheel and sticks 0.5 m from the center of the wheel. Afterward, the rotational speed of the wheel and clay has dropped to 48 rpm. The ...
  33. Physics

    Given: A flat dance floor of dimensions lx = 24 m by ly =23m and has a mass of M = 1200 kg. Use the bottom left corner of the dance floor as the origin. Three dance couples, each of mass m = 110 kg start in the top left, top right, and bottom left corners. What is the initial ...
  34. Physics

    Given: A flat dance floor of dimensions lx = 24 m by ly =23m and has a mass of M = 1200 kg. Use the bottom left corner of the dance floor as the origin. Three dance couples, each of mass m = 110 kg start in the top left, top right, and bottom left corners. What is the initial ...
  35. physics

    A rocket blasts off from rest and attains a speed of 49 m/s in 16 s. An astronaut has a mass of 56.3 kg. What is the astronaut's apparent weight during take off?
  36. math

    The American Dietetic Association reported that 31 out of every 100 people want to lose weight. If 384 students were surveyed at random in the student union, how many would want to lose weight?
  37. Math

    Math - Zo, Wednesday, April 22, 2015 at 8:44pm A wheel has s radius of 9 inches. If the wheel is rolled on a flat surface, how many revolutions will it take for the wheel to travel 90 ~ pie inches
  38. Physics

    A cylinder and a solid disc are released from rest from the top of a ramp.They roll down the hill without slipping. Which statement iscorrect? a. The cylinder reaches the bottom first b. The disc reaches the bottom first c. They both reach the bottom at the same time d. Could ...
  39. Physics

    A 1.60 meter tall woman is standing at the bottom of a freshwater pool. If the bottom pool is 8.00 meters deep, what is the pressure difference between the woman's feet and the top of her head?
  40. Math

    A building 24 m tall is viewed from the top and bottom of a vertical ladder.The building forms an angle of 45 degrees with the top of the ladder and an angle of 60 degrees with the bottom of the ladder.Find (i) the height of the vertical ladder (ii) the distance between the ...
  41. Physics

    A 46.5-cm diameter disk rotates with a constant angular acceleration of 2.4 rad/s2. It starts from rest at t = 0, and a line drawn from the center of the disk to a point P on the rim of the disk makes an angle of 57.3° with the positive x-axis at this time. (Hint: Remember ...
  42. physic

    Calculate the pressure exerted on the ground by a79kg person standing on one foot. Assume that the bottom of the person's foot is 13cm wide and 28cm long.
  43. GEOMETRY

    1.) Estimate the value of √ 52 to the nearest whole number: A. 9 B. 8 C. 7*** D. 6 2.) Identify all sets to which the number 3.1214122144...belongs A. rational number B. irrational number*** C. integer, rational number D. whole number, integer, irrational 3.) Which of these ...
  44. physics

    When the string is pulled a distance of 40 cm in 2.50 s, the wheel turns though 5 revolutions. What is the average speed of the string, and what is the average angular velocity of the wheel? What is the radius of the wheel?
  45. math

    The spoke of a wheel reaches from the center of the wheel to its rim. If the circumference of the rim of the wheel is 27 inches, how long is each spoke? Round your answer to the nearest hundredth. A. 2.93 B. 2.07 C. 8.59 D. 4.30
  46. Mathematics

    A travel agency offers group tours at a rate of $60/person for the first 30 participants. For longer groups-up to 90-each person receives a$0.50 discount for every participant in excess of 30. For example, if 31 participate, the cost/person is $59.50. Determine the size of the...
  47. physics

    Two identical thin wires are oriented along the x and y axes. With current on x plane going North. Current on y plane going West.Both carry the same current I, and there is no electrical contact between the wires. The points A, B, C, D are each equidistant from both wires. A: ...
  48. Physics

    An elevator is moving down with an acceleration of 1.40m/s^2.A 14.5-kg block hangs from a spring balance fixed to the roof of the elevator.What is the apparent weight of the block?
  49. Math

    The spoke of a wheel reaches from the center of the wheel to its rim. If the circumference of the rim of the wheel is 27 inches, how long is each spoke? Round your answer to the nearest hundredth. A. 2.93 B. 2.07 C. 8.59 D. 4.30 can someone explain how to do this problem I don...
  50. stats again

    ok I get it, so once I get the prob figred for one person, how do I figure it if additional attempts are made and the question is about the prob of at least one of the additional attempts say n = 6 getting the same results as the first Once you have the probability of passing ...
  51. science

    how does the weight of an object change with in sea change with densities ?
  52. calculus

    the weight of a person on or above the surface of the earth varies inversely as the square of the distance the person is from the center of the earth. if a person weighs 180 pounds on the surface of the earth and the radius of the earth is 3900 miles, what will the person ...
  53. physics

    Water flows over the edge of a waterfall at a rate of 1.2 x 106 kg/s. There are 50.0 m between the top and bottom of the waterfall. How much power is generated by the falling water by the time it reaches bottom?
  54. physics

    Water flows over the edge of a waterfall at a rate of 1.2 x 106 kg/s. There are 50.0 m between the top and bottom of the waterfall. How much power is generated by the falling water by the time it reaches bottom?
  55. PHYSICS

    What power (in horsepower) is developed by a grinding machine whose wheel has a radius of 8.10 in and runs at 2.50 rev/s, when the tool to be sharpened is held against the wheel with a force of 43.0 lb? The coefficient of friction between the tool and the wheel is 0.340 . Help...
  56. physics

    A hydraulic jack has an input piston with a diameter of 1.00 cm, and an output piston with a diameter of 6.00 cm. What weight (in N) can be lifted when a force of 45.8 N is applied to the input piston? Answer is 1650 N but I need someone walk me through the steps please.
  57. Physics - KE

    In Figure 11-32 (which shows a ball at the top of an incline, at the bottom of the incline a loop begins with radius R and Q a point on the loop lined up with the center of the loop), a solid brass ball of mass m and radius r will roll without slipping along the loop-the-loop ...
  58. Algebra help!!

    help please!! 1. There is an E like symbol that has a 7 at the top. On the bottom k=1 and on the right side (-1)^k K 2. There is an E like symbol that has a 8 at the top. ON the bottom K=3 and on the right side (-1)K/K(k-2)
  59. science

    The driving pulley of a motorbike rotates at 3 r/s and has a diameter of 300mm. The pulley exerts an effective force of 2000N at a point on its periphery. Calculate the turning moment and the power in Kw .
  60. Math

    Can someone help me and verify if the answer I picked is correct? 1. Which function does not have a maximum value? a) x^2 + 9 b) g(x) = 9 - x - x^2 c) h(x) = -(x+1)^2 d) k(x) = -4 + x - x^2 The answer is A because letter b,c,d opens the parabola downwards? Myra is riding a ...
  61. physics

    at a local country fair, the merry-go-round rotates at a rate of one circuit every 7.5 seconds. what is the angular velocity in radians per second
  62. Math

    1. A town has a population of 100,000 now and the population is increasing 10% every year. What will be the population in 5 years? 2. How many poles will be in a pile of telephone poles if there are 30 in the bottom layer, 29 in the second, and so on, until there is one in the...
  63. Math

    1. A town has a population of 100,000 now and the population is increasing 10% every year. What will be the population in 5 years? 2. How many poles will be in a pile of telephone poles if there are 30 in the bottom layer, 29 in the second, and so on, until there is one in the...
  64. Chemistry

    A truck has 5.9L diesel engine in it. 5.9L of the overall displacement in 6 cylinders each 102mm bore (diameter) and 120mm stroke (length). Engine operates at 16.3:1 compression ratio and with 6psi (0.41atm) of boost cruising at 1600rpm. 1.) The air mixture has an average ...
  65. Simplifying Rational Expressions

    Can someone slove these for me 1.(4x-12)/4x 2.(d+7)/(d^2-49 ) 3.(t^2-25)/(t^2+t-20) 4.(2x^2+6x+4)/(4x^2-12x-16) 5.(6-y)/*y^2-2y-24) all you have to do is reduce like #1 4x-12 ______ 4x cross out the 4x b/c it's on the top and bottom which leaves just -12 on the top You can't ...
  66. Physics

    If a pendulum-driven clock gains 5.00 s/day, what fractional change in pendulum length must be made for it to keep perfect time? Please provide explanations and solutions. Thanks in advance :D
  67. physics

    A large grinding wheel in the shape of a solid cylinder of radius 0.330 m is free to rotate on a frictionless, vertical axle. A constant tangential force of 210 N applied to its edge causes the wheel to have an angular acceleration of 1.161 rad/s2. (a) What is the moment of ...
  68. physics

    A large grinding wheel in the shape of a solid cylinder of radius 0.370m is free to rotate on a frictionless, vertical axle. A constant tangential force of 470 N applied to its edge causes the wheel to have an angular acceleration of 0.800 rad/s2. (a) What is the moment of ...
  69. physics

    A spoked wheel with a radius of 44.0 cm and a mass of 1.90 kg is mounted horizontally on frictionless bearings. JiaJun puts his 0.550-kg guinea pig on the outer edge of the wheel. The guinea pig begins to run along the edge of the wheel with a speed of 18.0 cm/s with respect ...
  70. physics

    If a trapeze artist rotates once each second while sailing through the air and contracts to reduce her rotational inertia to one-third of what it was, how many rotations per second will result?
  71. Math trig

    Two towers 50 meters apart from the top of the shorter tower to the top of the taller tower 43 degree elevation, depression from the top of shorter tower to the bottom of the taller tower is 36 degrees what is the height of each tower?
  72. physics

    to find the depth of the water surface in a well, a person drops a stone from the top of the well and simultaneously starts a stopwatch. The watch is stopped when the splash is heard, giving a reading of 3.65 s. The speed of sound is 340 m/s. Find the depth of the water ...
  73. Math

    5. How would you change this sentence to a true statement? b. Every irrational number is a rational number. c. Every irrational number is a real number. •• d. Every irrational number is a whole number. e. Every irrational number is a perfect square.
  74. math 11 - Ms. Sue i need your kind help

    i dontget how the textbook got the answer, h = -30cos[(1.43)x]° + 40 the question is: a paintball is shot at a wheel of radius 40 cm. the paintball leaves a cricuarmark 10 cm from the outer edge of the wheel. As the wheel rolls, the mark moves in a circular motion.assuming ...
  75. Trig

    The height of a rider on a Ferris wheel is given by h(t)=12-10c0s(2pi)(t) meters, where t gives time, in minutes of the ride. a. Find the amplitude, midline, and period of the function h. b. During the first two minutes of the ride, find the times when the rider has a height ...
  76. physics

    a piece of metal of density 7800kgm-3 weighs 20N in air. Cal. The apparent weight of th metal when completely immersed in a liquid of density 830kgm-3
  77. Physics

    A 46.5-cm diameter disk rotates with a constant angular acceleration of 2.4 rad/s2. It starts from rest at t = 0, and a line drawn from the center of the disk to a point P on the rim of the disk makes an angle of 57.3° with the positive x-axis at this time. (Hint: Remember ...
  78. calc

    I have asked a couple questions about surface integrals but I was not able to fully understand what the person who answered was saying and/or their answer was not correct. If someone could please help me with this problem that would be great! evaluate the surface integral ...
  79. physics

    If a person weighs 160 pounds, and the surface area of the bottom of both feet combined is 200 cm2. What is the pressure under the person’s feet (unit: N/m2)? What is the pressure if the person stands on only one foot (unit: N/m2)? [Hint: 1 kg = 2.2 lbs, 1 cm = 0.01 m, 1 cm2...
  80. PHYSICS PLEASE HELP !!!!!

    A daredevil is riding a motorcycle on the inside of a spherical metal cage of radius 9.7 meters. The total mass of the person and motorcycle is 79.2 kg. If he is to make a vertical circle within the cage at some constant speed, v, what normal force, in Newtons, does he feel at...
  81. physics

    The drawing shows a person looking at a building on top of which an antenna is mounted. The horizontal distance between the person's eyes and the building is d = 83.0 m. In part a the person is looking at the base of the antenna, and his line of sight makes an angle of θ1...
  82. physics

    In the figure below, a constant horizontal force Fapp of magnitude 17 N is applied to a wheel of mass 8 kg and radius 0.70 m. The wheel rolls smoothly on the horizontal surface, and the acceleration of its center of mass has magnitude 0.75 m/s2. (a) In unit-vector notation, ...
  83. Algebra 2/Trig

    I've done every other single question besides this one. (There was 12). I'm stumped and would really appreciate some help! I have to simplify this: 5/3sqrt(3-4) I am not sure if you have to conjugate the denominator and multiply it with the top and bottom, then simplify from ...
  84. precalculus

    A radio tower is located 450 feet from a building. From a window in the building, a person determines that the angle of elevation to the top of the tower is 29 degrees and that the angle of depression to the bottom of the tower is 22 degrees. How tall is the tower?
  85. math

    Mario walks his dog once every 8 days in the park. Todd walks his dog once every 14 days. today, both Mario and Todd walked their dogs in the park. In how many more days will both boys walk their dogs in the park on the same day?
  86. phyics

    The figure shows a person whose weight is W = 500 N doing push-ups. Find the normal force exerted by the floor on (a) each hand and (b) each foot, assuming that the person holds this position.
  87. physics

    The figure shows a person whose weight is W = 670 N doing push-ups. Find the normal force exerted by the floor on (a) each hand and (b) each foot, assuming that the person holds this position.
  88. math

    Two swimmers competed in a 20 mile race. Person 1 swam at a rate of 4 miles every 25 minutes. Person 2 swam at a rate of 3 miles every 20 minutes, Who won and what was each swimmers time?
  89. Engineering

    You have two balloons, one large (30 cm in diameter) and one small (15 cm in diameter) filled with helium. Both balloons are made of the same material (latex) and have the same unfilled material thickness (2 mm) and have a 3 cm diameter. You release both balloons at sea level ...
  90. physics!!!

    a sled and rider with a combined weight of 60kg are at rest on top of a hill 12m high.what is the total energy at the top of the hill?
  91. Pre-cal

    A bicycle with 26 inch diameter wheels is traveling at 10mph, to the nearest whole number how may revolutions does each wheel make per minute?
  92. Physics- Start off good?

    Estimate the moment of inertia of a bicycle wheel 67 cm in diameter. The rim of the tire have a combination mass of 1.1kg. (1.1)(67) = 73.3
  93. physics

    a person is sled-riding down a hill that is 15.0 ft high. starting at the top with a speed of 10.0 ft/s, the sled reaches the bottom with a speed of 25.0 ft/s. (A) determine whether mechanical energy has been conserved. (B) why might mechanical energy not be conserved?
  94. Algebra 2

    The force needed to overcome friction and drag a person across the floor depends on the person's weight. Manuel Dexterity can drag Gil O' Teen across the floor by pulling with a force of 51 pounds. Gil's brother, Nick who weighs twice as much can be dragged across the floor by...
  95. Physics

    A wheel mounted on a stationary axle starts at rest and is given the following angular acceleration: 9-12t where t is the time after the wheel begins to rotate. Find the number of revolutions that the wheel turns before it stops ( and begins to turn in the opposite direction).
  96. Algebra

    If a researcher wanted to know the mean weight (the mean is the sum of all the measurements divided by the number of measurements) of women in the U.S., the weight of every woman would have to be measured and then the mean weight calculated, an impossible task. Instead, ...
  97. Geometry

    Write a proof for the following Given: line AC is congruent to line BD, line AD is congruent to BC Prove: triangle DAX is congruent to triangle CBX It's an isosceles trapezoid. From top left is labeled A. Top right labeled B. Bottom right labeled C. Bottom left labeled D. With...
  98. Geometry

    Write proof for the following Given: line AC is congruent to line BD, line AD is congruent to BC Prove: triangle DAX is congruent to triangle CBX It's an isosceles trapezoid. From top left is labeled A. Top right labeled B. Bottom right labeled C. Bottom left labeled D. With X...
  99. Math

    Byong Sun withdraws $15 from his bank account once each day for four days. what integer represents the change in the amount in the account? find the integer that would represent the change in the amount in the account if Byong Su deposits $15 into his bank account once each ...
  100. science

    apparent change in wavelength of sound waves is 2.5cm when the source of sound is approaching stationary listener with velocity 8cm/s.
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