A horizontal platform is rotating with uniform angular velocity ω around the vertical axis passing through its centre. At some instant of time, a viscous liquid of mass m is dropped at the centre and is allowed to spread pout and finally fall. The angular velocity during this period ___________ a) Decreases continuously b) Decreases initially and increases again c) Remains unaltered d) Increases continuously
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A horizontal platform is rotating with uniform
a) Decreases continuously
b) Decreases initially and increases again
c) Remains unaltered
d) Increases continuously
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- A rotating space station is said to create “artificial gravity”—a loosely-defined term used for an acceleration that would be crudely similar to gravity. The outer wall of the rotating space station would become a floor for the astronauts, and centripetal acceleration supplied by the floor would allow astronauts to exercise and maintain muscle and bone strength more naturally than in non-rotating space environments. If the space station is 220 m in diameter, what angular velocity would produce an “artificial gravity” of 9.80 m/s2 at the rim? Give your answer in rad/s.1) Suppose a truck is going Around around about somewhere in Wisconsin. The roundabout has a radius of 15 m and the truck is blooming at 10 m/s.How long does it take for the truck to go around once? What is the angular velocity of the truck? 2)Suddenly the driver hit the brakes on the truck starts to slow with a linear acceleration of 1.2 m/s squared. What is the trucks angular acceleration? What is the total linear acceleration of the truck?Suppose a solid sphere of mass M and radius R rolls without slipping down on inclined plane starting from rest. The linear velocity, v, of the sphere at the bottom of the incline depends on A) Both the mass and the radius of the sphere B) Neither the mass nor the radius of the sphere C) The radius of the sphere D) The mass of the sphere
- A wheel is spinning at 440 rev/s. It undergoes an angular acceleration until it reaches an angular velocity of 527 rev/s. While accelerating, it completed 2414 revolutions. Determine how long the wheel was accelerating and its angular acceleration during that time. Ata .- s rev/s235- A solid sphere of mass m and radius r can rotate without slipping along the path shown in the figure. At the height h where the sphere will start its motion from rest, the lowest part of the sphere is higher than the lowest part of the circular part of the road with radius R (R = 5r). What should be the minimum height (h) of the point where the sphere will start to move in order for the sphere to fully circle this circular path?PRINTER VERSION BACK NEXT Chapter 10, Problem 051 GO In the figure, block 1 has mass m, - 488 g, block 2 has mass m, = 551 g, and the pulley is on a frictionless horizontal axle and has radius R = 4.78 cm. When released from rest, block 2 falls 71 9 cm in 5 27 s without the cord slipping on the pulley. (a) What is the magnitude of the acceleration of the blocks? What are (b) tension T, (the tension force on the block 2) and (c) tension T, (the tension force on the block 1)? (d) What is the magnitude of the pulley's angular acceleration? (e) What is its rotational inertia? Caution: Try to avoid rounding off answers along the way to the solution. Use g = 9.81 m/s. m2 (a) Number Units (b) Number Units (c) Number Units (d) Number Units (e) Number Units
- A rotating space station is said to create “artificial gravity”—a loosely-defined term used for an acceleration that would be crudely similar to gravity. The outer wall of the rotating space station would become a floor for the astronauts, and centripetal acceleration supplied by the floor would allow astronauts to exercise and maintain muscle and bone strength more naturally than in non-rotating space environments. If the space station is 200 m in diameter, what angular velocity would produce an “artificial gravity” of 9.80 m/s2 at the rim?An ice-skater starts to go into a spin, and she moves her arms closer towards her body. Then, she A) starts rotating slowerB) starts rotating fasterC) stops spinningD) rotation rate stays the same 9.) A large wheel rotates at 2 rev/sec. If the radius is 1m, then the linear speed of a point on the edge of the wheel is: A) 3.1 m/s B) 6.3 m/s C) 9.4 m/sD) 13.7 m/s 10.)Which of the following is NOT a unit of angular velocity? A) degrees per hour B) revolutions per day C) periods per secondD) radians per yearVentilation fan in a house, the length of each blade is 0.25 m, rotating at a constant angle of 20 rpm, the tangential velocity of the outer end of one blade, and its tangential acceleration respectively is equal to: Choose and solve steps a- 0.2m/s , 2m/s2 b- 5.0m/s ,2m/s2 c- 0.52m/s , 0m/s2 d- 20m/s ,0m/s
- Intro Physics I, Homework #7 See Walker Ch. 5, 6.1, 6.3, 7.1-7.2, 13.1 Submit to Google Classroom by 10 P.M., Monday, April 4 Remember to show all work and include units In Newton's late 17th century era, there were relatively accurate estimates, from terrestrial and astronomical observations and experiments, of the distance of the Earth to the Sun (dEs = 150 million 1. kilometers) and the circumference of the Earth (Cp = 40,000 kilometers [the meter was later defined during the late 18th century French revolution in relation to the size of the Earth]). Newton further estimated, likely based on the density of rocks, that the Earth was a solid sphere with a density about 6 times the density of water, which has density of pwater = 1 g/cm³.Oncies Current Attempt in Progress Multiple-Concept Example 7 deals with the concepts that are important in this problem. A penny is placed at the outer edge of a disk (radius= 0.136 m) that rotates about an axis perpendicular to the plane of the disk at its center. The period of the rotation is 1.73 s. Find the minimum coefficient of friction necessary to allow the penny to rotate along with the disk. Hs = Number i eTextbook and Media GO Tutorial Save for Later 150 Units Attempts: 0 of 5 used Submit AnswerThe diameters of the main rotor and tail rotor of a single-engine helicopter are 7.53 m and 1.04 m, respectively. The respective rotational speeds are 456 rev/min and 4,140 rev/min. Calculate the speeds of the tips of both rotors MAIN ROTOR M/S? TAIL ROTOR M/S Compare these speeds with the speed of sound, 343 m/sv main rotor = ? V SOUND tail rotor = V SOUND