A person picks up an iron ball on a rope and starts to spin it around them. The person does 500 J of work to get the mass spinning. While spinning, the person steps onto ice (take friction out of the equation). The result is both the mass and the person are spinning around the same point in space (the mass is circling faster on a larger radius and the man is circling slower on a smaller radius). There is a point between the masses that is stationary. The iron ball has a mass of m = 10 kg. The person has a mass of M = 80 kg.

A person picks up an iron ball on a rope and starts to spin it around them. The person does 500 J of work to get the mass spinning. While spinning, the person steps onto ice (take friction out of the equation). The result is both the mass and the person are spinning around the same point in space (the mass is circling faster on a larger radius and the man is circling slower on a smaller radius). There is a point between the masses that is stationary. The iron ball has a mass of m = 10 kg. The person has a mass of M = 80 kg.

University Physics Volume 1

18th Edition

ISBN:9781938168277

Author:William Moebs, Samuel J. Ling, Jeff Sanny

Publisher:William Moebs, Samuel J. Ling, Jeff Sanny

Chapter11: Angular Momentum

Section: Chapter Questions

Problem 35P: A bird flies overhead from where you stand at an altitude of 300.0 m and at a speed horizontal to...

See similar textbooks

Similar questions

A bird flies overhead from where you stand at an altitude of 300.0 m and at a speed horizontal to the ground of 20.0 m/s. The bird has a mass of 2.0 kg. The radius vector to the bird makes an angle with respect to the ground. The radius vector to the bird and its momentum vector lie in the xy-plane. What is the bird’s angular momentum about the point where you are standing?
Three disks A, B and C with same radius 5.0 cm are placed at coordinate (0,50 cm), (-15 cm, 0), and (15 cm, 0), respectively as shown as Figure 1. The masses of the three disks are ma 0.2 kg, mg = mc = 0.4 kg. They are connected by thin rods which has negligible masses. Find A(0, 50) MA = 0.2 B(-15,0) С(15, 0) тв 3 0.4 mc = 0.4 Figure 1 (a) the coordinate of the centre of mass of the system. (b) the rotational inertia about the axis perpendicular to the plane and passing through the centre of disk A.
In the game of tetherball a rope with length ?=1.50 m connects a ball with mass ?=0.750 kg to the top of a vertical pole so that the ball can spin around the pole as shown in the figure. What is the speed ? of the ball as it rotates around the pole when the angle ? of the rope is 38.0∘ with the vertical?
OUR TEACH A satellite is in a circular orbit of radius r around the Earth. (Use the following as necessary: G, ME, and r.) (a) Determine an expression that will allow you to find the speed of the satellite. V = (b) The satellite splits into two fragments, with masses m and 4m. The fragment with mass m is initially at rest with respect to the Earth, then falls straight towards the Earth. The fragment with mass 4m moves with initial speed v. Find an expression for v, V; = (c) Because of the increase in its speed, this larger fragment now moves in an elliptical orbit. Find an expression for the fragment's distance away from the center of the Earth when it reaches the far end of the ellipse.
Two spherical asteroids have the same radius R. Asteroid 1 has mass M and asteroid 2 has mass 2M. The two asteroids are released from rest with distance 10R between their centers. What is the speed of each asteroid just before they collide?
Earth is rotating about the Sun in our solar system. The distance between the Earth and Sunis 1.5 × 1011m. Consider the impact of an asteroid of mass 8.9 ×1015 kg and a speed of 90,000km/h with respect to the Earth’s surface. The asteroid strikes the Earth at the equator as shownin Figure. Consider the mass and radius of the Earth are ME = 5.97 × 1024 kg and RE = 6.38×106 m, respectively. Assume that the axial and orbital axis of rotations are parallel to eachother. 1. How much energy is needed to stop the Earth’s rotation about its axis after the collision? 2. What would be the moment of inertia of the Earth if the axis of rotation is parallelly shifted so that it touches the equator.
A puck of mass m = 46.0 g is attached to a taut cord passing through a small hole in a frictionless, horizontal surface (see figure below). The puck is initially orbiting with speed v, = 1.60 m/s in a circle of radius r, = 0.290 m. The cord is then slowly pulled from below, decreasing the radius of the circle to r = 0.150 m. (a) What is the puck's speed at the smaller radius? m/s (b) Find the tension in the cord at the smaller radius. (c) How much work is done by the hand in pulling the cord so that the radius of the puck's motion changes from 0.290 m to 0.150 m? Need Help? Master It Read It
In a certain binary-star system, each star has the same mass which is 9.0 times of that of the Sun, and they revolve about their center of mass. The distance between them is the 7.9 times the distance between Earth and the Sun. What is their period of revolution in years?
1978M1. An amusement park ride consists of a ring of radius A from which hang ropes of length éwith seats for the riders as shown in Figure I. When the ring is rotating at a constant angular velocity o each rope forms a constant angle 0 with the vertical as shown in Figure II. Let the mass of cach rider be m and neglect friction, air resistance, and the mass of the ring, ropes, and seats. In the space below, draw and label all the forces acting on rider X (represented by the point below) under the constant rotating condition of Figure II. Clearly define any symbols you introduce. a. b. Derive an expression for o in terms of A, 4 0 and the acceleration of gravity g. Determine the minimum work that the motor that powers the ride would have to perform to bring the system c. from rest to the constant rotating condition of Figure II. Express your answer in terms of m, g, 4 0, and the speed v of each rider.
You are coasting along on your bike (that has a 0.66 m diameter tire), You notice a twig in your spoke (at 1/2 the radius of the tire) hits the bike frame once per second. What is your speed in m/s?
Thebe, a moon of a distant planet Jove, is at a center-to-center distancer = 2.20 x 108 m from Jove. Jove's mass is 1.88 x 102' kg and Thebe's mass is 3.67 x 1023 kg. Assuming the orbit is circular, what is the orbital speed of Thebe? {Consider the moon Thebe is a satellite of the planet Jove} O 1.79 x 10° m/s O 2.39 x 10° m/s O 5.98 x 10 m/s O 9.53 x 10° m/s 07.35 x 10 m/s B com mand com mand
Earth is rotating about the Sun in our solar system. The distance between the Earth and Sun is 1.5 x 10'm. Consider the impact of an asteroid of mass 8.9 x1015 kg and a speed of 90,000 km/h with respect to the Earth's surface. The asteroid strikes the Earth at the equator as shown in Figure. Consider the mass and radius of thec Earth are ME 5.97 x 10 kg and R: = 6.38 x10° m, respectively. Assume that the axial and orbital axis of rotations are parallel to cach other. %3D Earth North Pole (d) How much encrgy is needed to stop the Earth's rotation about its axis after the collision? (e) What would be the moment of inertia of the Earth if the axis of rotation is parallelly shifted so that it touches the cquator?