Constants I Periodic Table You're riding a Ferris wheel while sitting on a scale. A Ferris wheel with radius 8.6 m has period 38 s Part A Find the scale reading for a 60 kg person at the bottom of the Ferris wheel, assuming a constant rotation rate. Express your answer to two significant figures and include the appropriate units. ? Value Units F = Request Answer Submit Part B Find the scale reading for a 60 kg person at the top of the Ferris wheel, assuming a constant rotation rate Express your answer to two significant figures and include the appropriate units. ? Value Units F =

Constants I Periodic Table You're riding a Ferris wheel while sitting on a scale. A Ferris wheel with radius 8.6 m has period 38 s Part A Find the scale reading for a 60 kg person at the bottom of the Ferris wheel, assuming a constant rotation rate. Express your answer to two significant figures and include the appropriate units. ? Value Units F = Request Answer Submit Part B Find the scale reading for a 60 kg person at the top of the Ferris wheel, assuming a constant rotation rate Express your answer to two significant figures and include the appropriate units. ? Value Units F =

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter8: Rotational Equilibrium And Dynamics

Section: Chapter Questions

Problem 75AP: Additional Problems A typical propeller of a turbine used to generate electricity from the wind...

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A particle of mass m moves along a straight line with constant velocity v0 in the x direction, a distance b from the x axis (Fig. P13.10). (a) Does the particle possess any angular momentum about the origin? (b) Explain why the amount of its angular momentum should change or should stay constant. (c) Show that Keplers second law is satisfied by showing that the two shaded triangles in the figure have the same area when . Figure P13.10
A pulsar is a rapidly rotating neutron star. The Crab nebula pulsar in the constellation Taurus has a period of 33.510-3s , radius 10.0 km, and mass 2.81030kg . The pulsar’s rotational period will increase over time due to the release of electromagnetic radiation, which doesn’t change its radius but reduces its rotational energy. (a) What is the angular momentum of the pulsar? (b) Suppose the angular velocity decreases at a rate of 1014rad/s2 . What is the torque on the pulsar?
You are working during your summer break as an amusement park ride operator. The ride you are controlling consists of a large vertical cylinder that spins about its axis fast enough that any person inside is held up against the wall when the floor drops away (Fig. P6.7). The coefficient of static friction between a person of mass m and the wall is s, and the radius of the cylinder is R. You are rotating the ride with an angular speed suggested by your supervisor. (a) Suppose a very heavy person enters the ride. Do you need to increase the angular speed so that this person will not slide down the wall? (b) Suppose someone enters the ride wearing a very slippery satin workout outfit. In this case, do you need to increase the angular speed so that this person will not slide down the wall? Figure P6.7
Additional Problems A typical propeller of a turbine used to generate electricity from the wind consists of three blades as in Figure P8.75. Each blade has a length of L = 35 in and a mass of m = 420 kg. The propeller rotates at the rate of 25 rev/min. (a) Convert the angular speed of the propeller to units of rad/s. Find (b) the moment of inertia of the propeller about the axis of rotation and (c) the total kinetic, energy of the propeller. Figure P8.75
(a) What is the angular momentum of the Moon in its orbit around Earth? (b) How does this angular momentum compare with the angular momentum of the Moon on its axis? Remember that the Moon keeps one side toward Earth at all times. (c) Discuss whether the values found in parts (a) and (b) seem consistent with the fact that tidal effects with Earth have caused the Moon to rotate with one side always facing Earth.
Review. Assume a certain liquid, with density 1 230 kg/m3, exerts no friction force on spherical objects. A ball of mass 2.10 kg and radius 9.00 cm is dropped from rest into a deep tank of this liquid from a height of 3.30 m above the surface. (a) Find the speed at which the hall enters the liquid. (b) Evaluate the magnitudes of the two forces that are exerted on the ball as it moves through the liquid. (c) Explain why the ball moves down only a limited distance into the liquid and calculate this distance. (d) With what speed will the ball pop up out of the liquid? (c) How does the time interval tdown, during which the ball moves from the surface down to its lowest point, compare with the lime interval tup for the return trip between the same two points? (f) What If? Now modify the model to suppose the liquid exerts a small friction force on the ball, opposite in direction to its motion. In this case, how do the time intervals tdown and tup compare? Explain your answer with a conceptual argument rather than a numerical calculation.
(I) The Sun subtends an angle of about 0.5° to us on Earth,150 million km away. Estimate the radius of the Sun.
3. An amusement park ride consists of a large vertical cylinder thatspins about its axis fast enough such that any person inside is heldup against the wall when the floor drops away. The coefficient ofstatic friction between person and wall is 0.25 and the radius of thecylinder is 7m. (a) How many minimum revolutions per minute does the cylindermake? (b) Calculate the angular velocity and frequency of the motion atthis condition. (c) What is the effect of the mass of the person on the time period,radial acceleration and tangential acceleration.
A Ferris wheel has radius of 5.0 m and makes one revolution in 8.0 seconds. A person weighing 670 N is sitting on one of the benches attached at the rim of the wheel. What is the apparent weight (that is, the normal force in Newtons exerted on her by the bench) of the person as she passes through the highest point of her motion? (Don't forget about sigfigs) I understand how to calculate the answer but cannot determine the correct number of sig figs for the final answer.
Just Part B only please, thank you! An automobile engine slows down from 3800 rpm to 1100 rpm in 2.0 s. Part A Calculate its angular acceleration, assumed constant. Express your answer using two significant figures. -141.375 rads/s Part B Calculate the total number of revolutions the engine makes in this time. Express your answer as an integer. N= ____ revolutions
Hi I am in physics I. Here is the description. A sphere has a mass of 8200 kg and a radius of 90 cm and floats with nearly zero friction on a thin layer of pressurized water. Suppose that she pushes on the sphere tangent to its surface with a steady force of F = 70 N and that the pressured water provides a frictionless support. How long will it take her to rotate the sphere one time, starting from rest? Please include details step by step. Thank you!
Answer parts a, and b of the following question:3. a) A Ferris wheel has radius 5.0 m and makes one revolution every 8.0 s with uniform rotation. A person who normally weighs 670 N is sitting on one of the benches attached at the rim of the wheel. What is the apparent weight (the normal force exerted on her by the bench) of the person as she passes through the highest point of her motion?b) Two identical tiny balls of highly compressed matter are 1.50 m apart. When released in an orbiting space station, they accelerate toward each other at 2.00 cm/s2. What is the mass of each of them? (G = 6.67 × 10-11 N ∙ m2/kg2)