College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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- You are riding your bicycle down the street at a speed of 16 m/s. Your bicycle's frame has a mass of 6.0 kg, and each of its two wheels has mass 2.2 kg and radius 0.34 m. Each wheel can be thought of as a hollow hoop (assuming that the rim has much larger mass than the spokes). What is the total kinetic energy of the bicycle (in Joules)?(take into account both the translational and rotational motion.)arrow_forwardA car is designed to get its energy from a rotating flywheel in the shape of a uniform, solid disk of radius 0.650 m and mass 600 kg. Before a trip, the flywheel is attached to an electric motor, which brings the flywheel's rotational speed up to 5.30 ✕ 103 rev/min. (a) Find the kinetic energy stored in the flywheel (in J). (b) If the flywheel is to supply energy to the car as a 12.0 hp motor would, find the length of time in hours the car could run before the flywheel would have to be brought back up to speed.arrow_forwardA hollow sphere of mass M and radius R = 0.15 m, with rotational inertia I = 0.040 kg · m² about a line through its center of mass, rolls without slipping up a surface inclined at 0 = 30° to the horizontal. At a certain position, say at a height hi from the ground, the sphere's total kinetic energy (its center of mass kinetic energy plus its rotational kinetic energy) is 20 J. (Hint: The moment of inertia of such a halo sphere is I = MR². The translational speed of a point on the surface of the sphere is the same as the speed of the center of mass of the sphere) (a) What ratio of this total kinetic energy is rotational? (b) What is the speed of the center of mass of the sphere at this position? (5 points) 1 m up the incline from this (initial) position, using When the sphere has moved d conservation of energy, find (c) its total kinetic energy ), and (d) the speed of its center of massarrow_forward
- A thin, hollow sphere of mass 2.30 kg and radius 0.610 m is rolling on a horizontal surface with a constant angular speed of 61.0 rpm. What fraction of the kinetic energy is translational kinetic energy, and what fraction of the kinetic energy is rotational kinetic energy?arrow_forwardA playground merry-go-round with an axis at the center (radius R = 1.5 m and rotational inertia | = 1.33 x 103 kgm²) is initially rotating at angular velocity wo = 1.1 rad/s (counter-clockwise). A girl of mass m = 39 kg is running at speed vo = 3.3 m/s in a direction tangent to the disk of the merry-go-round, intending to jump on to the point labeled with the green "x" (she is indicated by the purple circle in the figure). What is the angular momentum of the girl relative to the rotation axis of the merry-go-round? Your answer should be in kgm²/s, but enter only the numerical part in the box. R Woarrow_forwardAn old millstone, used for grinding grain in a gristmill, is a solid cylindrical wheel that can rotate about its central axle with negligible friction. The radius of the wheel is 0.330 m. A constant tangential force of 300 N applied to its edge causes the wheel to have an angular acceleration of 0.880 rad/s2. (a) What is the moment of inertia of the wheel (in kg · m2)? kg · m2 (b) What is the mass (in kg) of the wheel? kg (c) The wheel starts from rest and the tangential force remains constant over a time period of 5.50 s. What is the angular speed (in rad/s) of the wheel at the end of this time period? rad/sarrow_forward
- A car is designed to get its energy from a rotating flywheel in the shape of a uniform, solid disk of radius 0.650 m and mass 540 kg. Before a trip, the flywheel is attached to an electric motor, which brings the flywheel's rotational speed up to 5.30 ✕ 103 rev/min. HINT (a) Find the kinetic energy stored in the flywheel (in J). J (b) If the flywheel is to supply energy to the car as a 12.5 hp motor would, find the length of time in hours the car could run before the flywheel would have to be brought back up to speed.arrow_forwardA car is designed to get its energy from a rotating flywheel in the shape of a uniform, solid disk of radius 0.800 m and mass 600 kg. Before a trip, the flywheel is attached to an electric motor, which brings the flywheel's rotational speed up to 5.30 ✕ 103 rev/min. (a) Find the kinetic energy stored in the flywheel (in J). (b) If the flywheel is to supply energy to the car as a 10.5 hp motor would, find the length of time in hours the car could run before the flywheel would have to be brought back up to speed.arrow_forwardThe figure shows a uniform disk that can rotate around its center like a merry-go-round. The disk has a radius of 2.3 cm and a mass of 19 grams and is initially at rest. Starting at time t= 0, two forces are to be applied tangentially to the rim as indicated, so that at time t = 1.3 s the disk has an angular velocity of 200 rad/s counterclockwise. Force F, has a magnitude of 0.100 N. What is magnitude F2? Number i Units eTextbook and Media Hint GO Tutorial tv DII DD 888 F12 F10 F11 E7 F8 F9 F6 F4 F5 F1 F2 F3 ) 1 & 23 2$ 4 6 7 8 9. 3 { Q W E Y H K ...- * COarrow_forward
- A thin rod (length = 1.274 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 an object fixed to the top of the rod. The rod, starting from rest, tips over and rotates downward. (a) What is the angular speed of the rod just before it strikes the floor? (Hint: Consider using the principle of conservation of mechanical energy.) rad/s (b) What is the magnitude of the angular acceleration of the rod just before it strikes the floor? rad/s2arrow_forwardThe figure shows a uniform disk that can rotate around its center like a merry-go-round. The disk has a radius of 1.9 cm and a mass of 23 grams and is initially at rest. Starting at time t = 0, two forces are to be applied tangentially to the rim as indicated, so that at time t = 1.2 s the disk has an angular velocity of 270 rad/s counterclockwise. Force F1 has a magnitude of 0.0984 N. What is magnitude F2?arrow_forward
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