Answered: Physics Question

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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At its lowest setting a centrifuge rotates with an angular speed of ω1 = 350 rad/s. When it is switched to the next higher setting it takes t = 12.5 s to uniformly accelerate to its final angular speed ω2 = 750 rad/s. a. Calculate the angular acceleration of the centrifuge a1 in rad/s2 over the time interval t b. Calculate the total angular displacement (in radians) of the centrifuge, Δθ, as it accelerates from the intial to the final speed.
。 A propeller is modeled as five identical uniform rods extending radially from its axis. The length and mass of each rod are 0.871 m and 2.77 kg, respectively. When the propellor rotates at 529 rpm (revolutions per minute), what is its rotational kinetic energy K? K= 4123.5 Incorrect
I Review I Constants You are designing a rotating metal flywheel that will be used to store energy. The flywheel is to be a uniform disk with radius 35.0 cm. Starting from rest at t = 0, the flywheel rotates with constant angular acceleration 3.00 rad/s? about an axis perpendicular to the flywheel at its center. Part A If the flywheel has a density (mass per unit volume) of 8600 kg/m³, what thickness must it have to store 800 J of kinetic energy at t = 8.00 s? Express your answer with the appropriate units. HA h = Value Units Submit Request Answer
A merry-go-round accelerates from rest to 0.70 rad/s in 30 s. Part A Assuming the merry-go-round is a uniform disk of radius 8.0 m and mass 3.20×104 kg , calculate the net torque required to accelerate it. Express your answer to two significant figures and include the appropriate units.
15
A discus thrower starts from rest and begins to rotate with a constant angular acceleration of 2.4 rad/s2rad/s2 . Part A How many revolutions does it take for the discus thrower's angular speed to reach 5.0 rad/srad/s ? Express your answer using two significant figures. Part B How much time does this take? Express your answer using two significant figures.
Part A A stone is suspended from the free end of a wire that is wrapped around the outer rim of a pulley, as shown in the figure (see the figure (Figure 1)). The pulley is a uniform disk with mass 11.6 kg and radius 48.0 cm and turns on frictionless bearings. You measure that the stone travels a distance 12.4 m during a time interval of 3.50 s starting from rest. Find the mass of the stone. Take the free fall acceleration to be 9.80 m/s. ΑΣφ kg Submit Request Answer • Part B Find the tension in the wire. Take the free fall acceleration to be 9.80 m/s². 圈] ? Submit Request Answer Provide Feedback Figure 1 of 1 MacBook Air
A long, thin uniform rod of length 1.29m and mass 2.08kg is pivoted about a horizontal, frictionless pin passing through one end. The rod is released from one end in the vertical position. L y Pivot x At the instant the rod is horizontal, find its angular speed. Submit Answer Tries 0/10 At the instant the rod is horizontal, what is its angluar acceleration? Submit Answer Tries 0/10 At the instant the rod is horizontal, what is the magnitude of its x-component of acceleration at its centre of mass? Submit Answer Tries 0/10 At the instant the rod is horizontal, what is the magnitude of its Y-component of acceleration at its centre of mass? Submit Answer Tries 0/10
A Ferris wheel rotates at an angular velocity of 0.24 rad/s. Starting from rest, it reaches its operating speed with an average angular acceleration of 0.024 rad/s2. How long does it take the wheel to come up to operating speed? Number i Units
A bowling ball of mass 8.0 kg and radius 9.0 cm rolls without slipping down a lane at 4.0 m/s. Part A Calculate its total kinetic energy. Express your answer using two significant figures. ΜΕ ΑΣΦ K = ? J

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