Four particles, each of mass 0.16 kg are placed at the vertices of a square with sides of length 0.42 m the particles are connected by rods of negligible mass. this rigid body can rotate in a vertical plane about a horizontal axis a that passes through one of the particles. the body is released from rest with rod ab horizontal, as shown in the figure.(a) what is the rotational inertia of the body about axis a? (b) what is the angular speed of the body about axis a at the instant rod ab swings through the vertical position?

Large electric fields in cell membranes cause ions to move through the cell wall. the field strength in a typical membrane is 1.0 x 10 7 n/c. what is the magnitude of the force on a calcium ion with charge +e? what is its acceleration? is it possible for a particle with the same charge as as calcium to have a different acceleration if placed at this location? what would change the acceleration: mass of the particle? diameter of the particle?

Aloop of wire is in a magnetic field such that its axis is parallel with the field direction. which of the following would result in an induced emf in the loop? choose all that apply. a loop of wire is in a magnetic field such that its axis is parallel with the field direction. which of the following would result in an induced emf in the loop? choose all that apply. moving the loop outside of the magnetic field region. spin the loop such that its axis does not consistently line up with the magnetic field direction. change the magnitude of the magnetic field. change the diameter of the loop

When solid surfaces slide over each other the kind of friction that occurs is called friction