Which has greater angular speed a horse




















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We don't save this data. Google use cookies for serving our ads and handling visitor statistics. AddThis use cookies for handling links to social media. Please read AddThis Privacy for more information. Conceptual Questions What is the purpose of the small propeller at the back of a helicopter that rotates in the plane perpendicular to the large propeller?

Without the small propeller, the body of the helicopter would rotate in the opposite sense to the large propeller in order to conserve angular momentum. The small propeller exerts a thrust at a distance R from the center of mass of the aircraft to prevent this from happening. As the rope of a tethered ball winds around a pole, what happens to the angular velocity of the ball?

The angular velocity increases because the moment of inertia is decreasing. Competitive divers pull their limbs in and curl up their bodies when they do flips. Just before entering the water, they fully extend their limbs to enter straight down see below. Explain the effect of both actions on their angular velocities. Also explain the effect on their angular momentum. A disk of mass 2. The small mass suddenly separates from the disk. If the Sun should collapse into a white dwarf of radius. If the cylinders couple so they have the same rotational axis what is the angular speed of the combination?

What percentage of the original kinetic energy is lost to friction? A diver off the high board imparts an initial rotation with his body fully extended before going into a tuck and executing three back somersaults before hitting the water.

If his moment of inertia before the tuck is. An Earth satellite has its apogee at km above the surface of Earth and perigee at km above the surface of Earth. What is its speed at perigee?

A Molniya orbit is a highly eccentric orbit of a communication satellite so as to provide continuous communications coverage for Scandinavian countries and adjacent Russia.

The orbit is positioned so that these countries have the satellite in view for extended periods in time see below. If a satellite in such an orbit has an apogee at 40, Shown below is a small particle of mass 20 g that is moving at a speed of The cylinder is free to rotate about its axis through its center and is perpendicular to the page.

The cylinder has a mass of 0. A bug of mass 0. The disk is rotating at The bug crawls to the center of the disk. A uniform rod of mass g and length cm is free to rotate in a horizontal plane around a fixed vertical axis through its center, perpendicular to its length. Two small beads, each of mass 20 g, are mounted in grooves along the rod. With the beads in this position, the rod is rotating with an angular velocity of When the catches are released, the beads slide outward along the rod.

A boy of mass 50 kg runs tangent to the rim at a speed of 4. If the merry-go-round is initially at rest, what is the angular velocity after the boy jumps on? A playground merry-go-round has a mass of kg and a radius of 1. What is its angular velocity after a The child is initially at rest. Three children are riding on the edge of a merry-go-round that is kg, has a 1. The children have masses of If the child who has a mass of Find the value of his moment of inertia if his angular velocity decreases to 1.

What average torque was exerted if this takes Twin skaters approach one another as shown below and lock hands. Each has a mass of You may approximate their moments of inertia to be that of point masses at this radius. The baseball is 0. In , in Warsaw, Poland, Olivia Oliver of Nova Scotia broke the world record for being the fastest spinner on ice skates.

If an ice skater extends her arms at that rotation rate, what would be her new rotation rate? Assume she can be approximated by a kg rod that is 1. With her arms stretched take the approximation of a rod of length cm with. A satellite in a geosynchronous circular orbit is 42, A small asteroid collides with the satellite sending it into an elliptical orbit of apogee 45, What is the speed of the satellite at apogee?

Assume its angular momentum is conserved. A gymnast does cartwheels along the floor and then launches herself into the air and executes several flips in a tuck while she is airborne. If her moment of inertia when executing the cartwheels is.

Which of the following is NOT a unit of rotational speed? Meters per second. Revolutions per minute. Revolutions per second. Rotations per second. Which has greater angular speed, a horse near the outside rail of a merry-go-round or a horse near the inside rail?

Neither - they both have the same angular speed. A bug on a turning phonograph record will make more turns per minute if it is located toward the center of the record. Which has greater linear speed, a horse near the outside rail of a merry-go-round or a horse near the inside rail? Stars originate as large bodies of slowly rotating gas.

Because of gravity, these clumps of gas slowly decrease in size. What happens to the angular speed of the start as it shrinks? It starts to accelerate in the forward direction. The rotation rate stays the same. Which of these has the greatest centripetal acceleration? Large Velocity, Large Radius.

Small Velocity, Small Radius. Large Velocity, Small Radius. Small Velocity, Large Radius. The rotational equivalent to x displacement , v velocity and a acceleration are?



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