1. Physics

    A 570.0 g ball moves in a vertical circle on a 103.0 cm-long string. If the speed at the top is 4.30 m/s, then the speed at the bottom will be 10.65 m/s. (you'll learn how to show this Chapter 10.) What is the gravitational force (in N) acting on the ball? What is the tension ...
  2. physics

    Each of the four wheels of the vehicle weighs 40 lb and is mounted on a 4in diameter journal. The total weight of the vehicle is 960 lb, including wheels, and is distributed equally on all four wheels. If a force P = 16 lb is required to keep the vehicle rolling at a constant ...
  3. physics

    What is the apparent weight of a 36 kg block of aluminum (density 2700 kg/m3) completely submerged in a fluid with density 1300 kg/m3?
  4. physics

    If a person who weighs 125lb, rides a roller coaster with a 100m diameter loop at 30m/s. What force did the person exert?
  5. Physics

    A hoop of mass M = 3 kg and radius R = 0.5 m rolls without slipping down a hill, as shown in the figure. The lack of slipping means that when the center of mass of the hoop has speed v, the tangential speed of the hoop relative to the center of mass is also equal to vCM, since...
  6. science

    A hoop of mass M = 4 kg and radius R = 0.4 m rolls without slipping down a hill, as shown in the figure. The lack of slipping means that when the center of mass of the hoop has speed v, the tangential speed of the hoop relative to the center of mass is also equal to vCM, since...
  7. earth

    If a person has a weight of 145 lb at sea level, by how much is their weight reduced when flying on an airplane at an altitude of 10700 m?
  8. physics

    If a person has a weight of 145 lb at sea level, by how much is their weight reduced when flying on an airplane at an altitude of 10700 m?
  9. Math

    The height, h, in metres, above the ground of a rider on a Ferris wheel can be modelled by the equation: h= 10 sin ((pi/15 t) - 7.5) + 12 where t is the time, in seconds. At t=0, the rider is at the lowest point. Determine the first two times that the rider is 20 m above the ...
  10. physics

    Consider a 1kg mass at rest at the equator.Because of the earths rotation , the mass experiences a centripetal acceleration. a)Draw free body diagram of mass b)Find centripetal force acting in the mass c)Compare apparent weight and true weight d)what fictitious force would the...
  11. Math

    The paddle wheel of a boat measures 16 feet in diameter and is revolving at a rate of 20 rpm. The maximum depth of the paddle wheel under water is 1 foot. Suppose a point is located at the lowest point of the wheel at t=0. 1. Write a cosine function with phase shift 0 for ...
  12. Physics

    A raft is made of 14 logs lashed together. Each is 29.5 cm in diameter and has a length of 6.50 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 75.0 kg? Do not neglect the weight of the ...
  13. Physics

    1) An 8.5kg bowling ball dropped 11m hits the ground 1.5 seconds later. What is the magnitude of the force acting on the ball during the fall? 2) Shuttle astronauts climb at a rate of 24.5m/s^2 shortly after takeoff. What apparent weight would a 95kg astronaut have during this...
  14. Math, Geomertry

    A piece of a broken wheel is shown. It was taken to a machine shop to be replaced with a new “whole” wheel. Find the radius of the wheel AC=10cm, BD=3 cm and D is the midpoint of AC. Round to the nearest hundredth.
  15. 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 260 N applied to its edge causes the wheel to have an angular acceleration of 0.795 rad/s2. (a) What is the moment of ...
  16. 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 250 N applied to its edge causes the wheel to have an angular acceleration of 1.053 rad/s2. (a) What is the moment of ...
  17. 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 280 N applied to its edge causes the wheel to have an angular acceleration of 0.960 rad/s2. (a) What is the moment of ...
  18. 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 270 N applied to its edge causes the wheel to have an angular acceleration of 0.854 rad/s2. (a) What is the moment of ...
  19. Astronomy

    Hi, can you please check my work? I really need to do well on this. 1. What properties of a star are needed to calculate the stars luminosity? a. size and apparent brightness b.mass and distance to the star**** c. temperature and diameter of the star d. apparent brightness and...
  20. 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 of bar is 2 when bar ...
  21. 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 of bar is 2 when bar ...
  22. 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 of bar is 2 when bar ...
  23. physics

    A person pulls with a force of 40 N on two boxes at rest. The top box is 3.0 kg and the bottom box is 6.0 kg. The coefficient of kinetic friction between the floor and the larger box is .20 and the angle is 30 degrees. a) if the smaller box doesn't slide on top of the larger ...
  24. physics

    A person pulls with a force of 40 N on two boxes at rest. The top box is 3.0 kg and the bottom box is 6.0 kg. The coefficient of kinetic friction between the floor and the larger box is .20 and the angle is 30 degrees. a) if the smaller box doesn't slide on top of the larger ...
  25. grade 12 math

    In 2011, the estimated population of Canada was 34 699 000. If the government wants to use an alphabetic string using letters of the alphabet for every person in Canada. How long should the string of letters (repetition allowed) be so that every person in Canada can have a ...
  26. physics

    A person is riding a bicycle, and its wheels have an angular velocity of +15.5 rad/s. Then, the brakes are applied and the bike is brought to a uniform stop. During braking, the angular displacement of each wheel is +15.5 revolutions. (a) How much time does it take for the ...
  27. trigonometry

    The sprockets and chain of a bicycle are shown in the figure. The pedal sprocket has a radius of 4 in., the wheel sprocket a radius of 2 in., and the wheel a radius of 13 in. The cyclist pedals at 45 rpm. (a) Find the angular speed of the wheel sprocket. rad/min (b) Find the ...
  28. physics help plz thanks

    An arrangement of two pulleys, as shown in the figure, is used to lift a 49.6-kg mass a distance of 3.70 m above the starting point. Assume the pulleys and rope are ideal and that all rope sections are essentially vertical. (a) What is the mechanical advantage of this system...
  29. physics need help plz

    An arrangement of two pulleys, as shown in the figure, is used to lift a 49.6-kg mass a distance of 3.70 m above the starting point. Assume the pulleys and rope are ideal and that all rope sections are essentially vertical. (a) What is the mechanical advantage of this system...
  30. Physics

    A./_\ B.\_/ C.|_| The three tanks shown above are filled with water to an equal depth. All the tanks have an equal height. Tank A has the greatest surface area at the bottom, tank B the least and tank C the middle. (Select T-True, F-False, G-Greater than, L-Less than, E-Equal ...
  31. Theory of machine

    A punching machine carries out of 5 holes per minute each hole of 30 mm diameter in 40 mm thick plate requires 10 Nm of energy/mm2 of the sheared area.The punch has a stroke of 90 mm.Find the power of the motor required if the mean speed of the fly wheel is 20 m/sec.If the ...
  32. PARALLELOGRAM WRITING A PROOF

    given: segment SV is parallel to segment TU and triangle SVX is congruent to triangle UTX [the figure has a V on the top left corner, U on the top right corner, X in the middle of four triangles inside and S on the bottom left and T on the bottom right] prove VUTS is a ...
  33. chemistry

    A 6.0-ft person weighs 177lb. express this person's height in meters and weight in kilograms.
  34. advanced functions

    the height in meters, of a passenger on a Ferris wheel is given by the function h(t)=11-10cos(0.1pit), where t is the time in seconds. How long will it take a passenger to reach a height of 5 meters the first time? Express your answer to 3 decimal places.
  35. Trigonometry

    Suppose that Lance Armstrong1 is using a 180 mm chain ring and pedaling at a rate of 80 revolutions per minute. The wheels on his road bike have a diameter of 622mm. What diameter sprocket on the rear wheel does he need to maintain a speed of 30 kilometers per hour? In your ...
  36. engineering

    a bolt located 50mm from the center of an auto wheel is tightened by the couple shown for .10 seconds. determine the resulting angular velocity of the wheel if the wheel has a radius of gyration of 250 mm and a mass of 19 kilograms
  37. Calculus!

    A 16 ft. ladder leans against a wall, with the top being 12 ft. from the wall when time t=0. The top is sliding down at a constant rate of 4 ft./second. Given that the top of the ladder touches the ground at 3 seconds, what is the velocity of the bottom of the ladder when t=3?
  38. Parallelogram Question Writing a Proof

    given: segment SV is parallel to segment TU and triangle SVX is congruent to triangle UTX [the figure has a V on the top left corner, U on the top right corner, X in the middle of four triangles inside and S on the bottom left and T on the bottom right] prove VUTS is a ...
  39. physics

    A rescue helicopter lifts a 85.2-kg person straight up by means of a cable. The person has an upward acceleration of 0.764 m/s2 and is lifted from rest through a distance of 12.5 m. (a) What is the tension in the cable? How much work is done by (b) the tension in the cable and...
  40. physics

    A rescue helicopter lifts a 85.8-kg person straight up by means of a cable. The person has an upward acceleration of 0.643 m/s2 and is lifted from rest through a distance of 13.1 m. (a) What is the tension in the cable? How much work is done by (b) the tension in the cable and...
  41. math

    A bicycle wheel has a diameter of 26 inches. About how far will it travel in one revolution?
  42. maths

    how many revolution will a wheel having 56cm diameter make to cover a distance of 11km?
  43. geometry

    A wheel with a diameter of 18 m takes one full rotation.How much distance has it travelled?
  44. college algebra

    How many feet does a wheel with a diameter of 20 inches travel after five revolutions?
  45. Math

    The diameter of a bicycle wheel is 65 cm How many revolutions are needed to make the bike travel 2km
  46. maths

    a wheel with a diameter 63 cm, when goes round 1000 times will cover a total distance of
  47. PHYSICS ROLLING MOTION!!!

    A unicycle with a tire 44.0 cm in diameter travels 2.00 km. How many revolutions does the wheel make?
  48. Math

    How far will a 4ft diameter wheel travel while making 100 revolution?
  49. Math

    A wheel has diameter 84 cm . Find how many complete revolutions must it make to cover 3.168 km.
  50. Math

    How many feet does a wheel with a diameter of 20 inches travel after one, five, and 30 revolutions?
  51. Physics

    In a Joule experiment, a mass of 1.00 kg falls through a height of 50.0 m and rotates a paddle wheel that stirs 0.600 kg of water. The water is initially at 15 degrees C. By how much does its temperature rise (in degrees C)?
  52. College Physics

    A wheel of radius 0.398 m is mounted on a frictionless horizontal axis. The rotational inertia of the wheel about the axis is 0.0576 kg·m2. A massless cord wrapped around the wheel is attached to a 0.790 kg block that slides on a horizontal frictionless surface. If a ...
  53. Physics

    A person is riding a bicycle, the wheels of a bicycle have an angular velocity of +18.5 rad/s. Then, the brakes are applied. In coming to rest, each wheel makes an angular displacement of +14.5 revolutions. (a) How much time does it take for the bike to come to rest? 1 s (b) ...
  54. Chemistry

    Calculate the kinetic energy change in the water that occurs when 10,000lb/hr flow in a pipe that is reduced from a diameter of 2 in. to a diameter to 1 in. Any ideas on solving this? The answer is 2.7 lbf*ft.
  55. ivcc

    What is the magnitude of the apparent weight of a 76 astronaut 3200 from the center of the Earth's Moon in a space vehicle accelerating toward the Moon at 3.6 ?
  56. Physics

    A rocket blasts off from rest and attains a speed of 42.2 m/s in 10.9 s. An astronaut has a mass of 63.8 kg. What is the astronaut's apparent weight during takeoff?
  57. Physics

    A rocket blasts off from rest and attains a speed of 30.4 m/s in 10.3 s. An astronaut has a mass of 60.1 kg. What is the astronaut's apparent weight during takeoff?
  58. physics

    A man of mass 60kg standing inside a lift with an acceleration of 2m/s(square).Find the apparent weight that a man feels(g is 10).
  59. physics

    A rocket blasts off from rest and attains a speed of 59.4 m/s in 14.1 s. An astronaut has a mass of 66.7 kg. What is the astronaut's apparent weight during takeoff?
  60. physics

    A rocket blasts off from rest and attains a speed of 59.4 m/s in 14.1 s. An astronaut has a mass of 66.7 kg. What is the astronaut's apparent weight during takeoff?
  61. physics

    A rocket blasts off from rest and attains a speed of 58.9 m/s in 14.4 s. An astronaut has a mass of 57.5 kg. What is the astronaut's apparent weight during takeoff?
  62. Physics

    A rocket blasts off from rest and attains a speed of 53.8 m/s in 17.4 s. An astronaut has a mass of 67.2 kg. What is the astronaut's apparent weight during takeoff?
  63. Physics

    A rocket blasts off from rest and attains a speed of 42.3 m/s in 13.8 s. An astronaut has a mass of 70.2 kg. What is the astronaut's apparent weight during takeoff?
  64. math

    a drinking glass 5 inches tall has a 2.5 inch diameter base. its sides slope upward at a 4 degree angle. what is the diameter of the top of the glass?
  65. Precalculus

    A drinking glass 5 inches tall has a 2.5 inch diameter base. Its sides slope outward at a 4 degree angle. What is the diameter of the top of the glass?
  66. Physics

    Three point charges of 8 C, 3 C, and -5 C, are locate at the top, bottom left, and bottom right corners respectively of an equilateral triangle of side 1Å. Find the magnitude and direction of the net force on the 3 C charge.
  67. physics

    A steel ball is tossed into the ocean and comes to rest at a depth of 2.40 km. Find its fractional change in volume, assuming the density of seawater is 1020 kg/m3.
  68. Physics

    A block of mass 77.0kg is placed at the top of a frictionless plane that is inclined 46degrees to the horizontal. The height of the plane is 23.0meters. Find the speed of the block and the bottom of the plane. The correct answer is: 21.2m/s... I've tried this equation every ...
  69. Chemistry

    One chirality of CH3CHlCOOH is shown below. Identify the image(s) below that exhibit the opposite chirality. Select all that apply. I)Top Left Molecule II)Bottom Right Molecule III)Bottom Left Molecule IV)Top Right Molecule
  70. Calculus

    A 17 foot ladder is leaning against a wall. The bottom of the ladder is moving out away from the wall at 0.6 feet per second. The top of the ladder then begins sliding down the wall. How fast is the top of the ladder going when the bottom is 8 feet away from the wall?
  71. stats

    Scores on a test are approximately normally distributed with a mean of 70 and a standard deviation of 9. The teacher wants to give A’s to the top 10% of students, B’s to the next 25%, and C’s to the next 42%. a.) what is the bottom cutoff for a C grade? b.) what is the ...
  72. Physics

    The large disk-shaped flywheel illustrated below has a radius R of 0.25 m. It is made to spin by the small wheel that contacts it at its rim. The small wheel applies a constant force of 1430 N. Friction in the bearing exerts a retarding torque 22 Nm on the large wheel. If the ...
  73. science , physics

    A person is riding a bicycle, and its wheels have an angular velocity of +15.5 rad/s. Then, the brakes are applied and the bike is brought to a uniform stop. During braking, the angular displacement of each wheel is +15.5 revolutions. (a) How much time does it take for the ...
  74. Math

    A person walks on the building. He slips 1m for every 5m he climbs. If the building is 53m high and he takes 5 seconds to climb 1m . Find the total time taken by him to get on the top of the building . Please- solve this problem using integers.
  75. Physics - 2

    A single bead can slide with negligible friction on a wire that is bent into a circular loop of radius 15.0 cm, as in Figure P6.68. The circle is always in a vertical plane and rotates steadily about its vertical diameter with (a) a period of 0.450 s. The position of the bead ...
  76. physics

    A 126 kg student sits on a chair which is solely supported by a solid 0.4 meter-long steel rod 0.81 cm in diameter. To the nearest micron (millionth of a meter), what is the change in length of the rod produced by the student's weight?
  77. maths

    The ‘body mass index’ is used to find the body weight that is appropriate for a person’s height. It is calculated using the formula. I = W/H^2 Where I is the body mass, W is the person’s weight in kg, and H is the person’s height in metres. Use the formula to find ...
  78. physics

    You hold a bucket attached to a rope, and in the bucket is a 500.0 g rock. You swing the bucket so the rock moves in a vertical circle 1.6 m in diameter. What is the minimum speed the rock must have at the top of the circle if it is to always stay in contact with the bottom of...
  79. physics

    You hold a bucket attached to a rope, and in the bucket is a 500.0 g rock. You swing the bucket so the rock moves in a vertical circle 1.6 m in diameter. What is the minimum speed the rock must have at the top of the circle if it is to always stay in contact with the bottom of...
  80. physics

    You hold a bucket attached to a rope, and in the bucket is a 500.0 g rock. You swing the bucket so the rock moves in a vertical circle 1.6 m in diameter. What is the minimum speed the rock must have at the top of the circle if it is to always stay in contact with the bottom of...
  81. physics

    You hold a bucket attached to a rope, and in the bucket is a 500.0 g rock. You swing the bucket so the rock moves in a vertical circle 1.6 m in diameter. What is the minimum speed the rock must have at the top of the circle if it is to always stay in contact with the bottom of...
  82. Health

    Individuals suffering from anorexia suffer extreme weight loss, usually _____ below the person's normal body weight 5% 8% 10%**** 15%
  83. Trigonometry

    Thank you for the respond!! I appreciate it. But it says on my paper 360 rev/min = 360 (2pi/60) rad/s = 12pi rad/s and so D= 2r = 2(s/theta) = 2(40/12pi) ft = 20/3pi ft = 2.12 ft should be the answer :( I have 2 more if that's alright. A point on the rim of a turbine wheel of ...
  84. Physics- Simple machines

    A wheel and axle arrangement has an axle with a diameter of 25cm. A rope is wrapped around the axle and is supporting a load of 2 tonnes. 1) If the mechanical advantage of the system is 30, determine the diameter of the wheel___________m. 2)Determine the effort required to ...
  85. Discrete Math

    In roulette, a wheel with 38 numbers is spun. Of these, 18 are red, 18 are black, and 2 are green. The probability that when the wheel is spun it lands on any particular number is 1/38. a) What is the probability that the wheel lands on a red number? b) What is the probability...
  86. Physics

    A block slidly on a frictionless inclined plane if the block starts from rest to the top.Then,find the time to reach to the bottom and the velocity at the bottom
  87. Physics

    a 52kg person riding a bike rotates her wheels in a circle of 17 cm what is her max tourque
  88. Physics

    A satellite has a mass of 5750 kg and is in a circular orbit 3.6 * 10^5 m above the surface of a planet. The period of the orbit is two hours. The radius of the planet is 4.20 * 10^6 m. What is the true weight of the satellite when it is at rest on the planet's surface? Ok for...
  89. Geometry

    Find the measure of angle 8, 7, 6, 5 measure of angle 7 is 2x+15 measure of angle 8 is 3x The diagram is a X shape but the top and bottom is more squished down basically. 5 on the left 6 on the top 7 on the right 8 on the bottom Please help I cant find the formula to do this. ...
  90. physic, please correct is am wrong

    A wheel of a car is measured to rotate 200 revolutions in 24 seconds. Calculate the following. i. The angle turned in radians? θ =degree * 2π/360= θ=200 *2π/360 θ=3.49 ii. The angular velocity in rad/s ω=θxt ω=3.94/24 ω=0.145 rad/s If the diameter of the wheel is 0.5 ...
  91. chemistry

    One chirality of CH3CHClCOOH is shown below. Identify the image(s) below that exhibit the opposite chirality. Select all that apply. 1)Top Left Molecule 2)Bottom Right Molecule 3)Bottom Left Molecule 4)Top Right Molecule
  92. calculus

    I have to help teach this class tomorrow for my Senior Seminar Math class. The lesson is over Exponential and Logarithmic Functions and L'Hospital's Rule. I have all the problems needed to review this lesson, but i can not solve any of them. My teaching partner and I have had ...
  93. chemistry

    It is found experimentally that the terminal settling velocity uo of a spherical particle in a fluid is a function of the following quantities: particle diameter, d; buoyant weight of particle (weight of particle - weight of displaced fluid), W; fluid density, ρ, and fluid ...
  94. Physics Gravitation Question

    Vesta, a minor planet in the Asteriod Belt between Mars and Jupiter, has a mean radius of 525 km and mass of 2.59 X 10^20 kg. The Dawn Spacecraft (m = 1240 kg) orbited Vesta in 2011 & 2012. Find the local acceleration due to gravity at the mean surface of Vesta. What is the ...
  95. Physics

    Now your bicycle wheel is rotating with an angular speed of 43.8 rad/s. The wheel has a mass of 4.9 kg and a radius of 48.6 cm. Treat the wheel as a solid thin disc. (a) Calculate the rotational kinetic energy of the wheel in J. (b) Calculate the angular speed the wheel must ...
  96. physics

    Wheel A of radius ra = 14.6 cm is coupled by belt B to wheel C of radius rc = 30.2 cm. Wheel A increases its angular speed from rest at time t = 0 s at a uniform rate of 5.0 rad/s2. At what time will wheel C reach a rotational speed of 52.9 rev/min, assuming the belt does not ...
  97. Math

    I've been working on this problem for HOURS and I still can't figure it out. It's due by tomorrow. And I'm so frustrated. DX I know I have to convert ounces into gallons, but I can't find a path at all. DX Here is the question: I need to mix the gas with oil for my weed ...
  98. Physics

    A 55 kg skier is at the top of a slope that is 10.0 m high. a) Set the zero level for gravitational potential energy at the bottom of the slope and find the gravitational potential energy for the skier at the top and the bottom of the slope. What is the PE difference between ...
  99. physic

    Wheel A of radius ra = 6.1 cm is coupled by belt B to wheel C of radius rc = 33.3 cm. Wheel A increases its angular speed from rest at time t = 0 s at a uniform rate of 7.1 rad/s2. At what time will wheel C reach a rotational speed of 119.3 rev/min, assuming the belt does not ...
  100. physic

    Wheel A of radius ra = 6.1 cm is coupled by belt B to wheel C of radius rc = 33.3 cm. Wheel A increases its angular speed from rest at time t = 0 s at a uniform rate of 7.1 rad/s2. At what time will wheel C reach a rotational speed of 119.3 rev/min, assuming the belt does not ...
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