If we have two spheres, one of iron with a mass of 1 kg and one of wood with the same mass, which is the ratio of their weights?

A solid sphere of mass m and radius R is rotating about its diameter. A solid cylinder of the same mass and same radius is also rotating about its geometrical axis with an angular speed twice that of the sphere. The ratio of their KE of rotation will be__

Two spheres, each with a mass of0.46 g and each having the same charge, hang from threads ofnegligible mass which make an angle of 25.0° with the vertical.When hanging, the spheres are a distance of L = 4.08 cm from eachother.


(a) Find the magnitude of the electric force acting on eachsphere.
N

(b) Find the tension in each of the threads.
N

(c) Find the magnitude of the charge on the spheres.
C

13.47 ... CP An experiment is performed in deep space with two uniform spheres, one with mass 50.0 kg and the other with mass 100.0 kg. They have equal radii, r = 0.20 m. The spheres are released from rest with their centers 40.0 m apart. They accelerate toward each other because of their mutual gravitational attraction. You can ignore all gravitational forces other than that between the two spheres. (a) Explain why linear momentum is conserved. (b) When their centers are 20.0 m apart, find (i) the speed of each sphere and (ii) the magnitude of the relative velocity with which one sphere is approaching the other. (C) How far from the initial position of the center of the 50.0-kg sphere do the surfaces of the two spheres collide?