The diagram below represents a ball traveling with a uniform clockwise circular motion on a string.
Which of the following best represents the directions of both the velocity and
centripetal acceleration of the ball at the instant shown in the diagram?

What type of light does this light bulb produce most (i.e. at what wavelength does the spectrum have maximum intensity)?

The two required components for a generator

The man of mass m1 and the woman of mass m2 are standing on opposite ends of the platform of mass m0 which moves with negligible friction and is initially at rest with s = 0. the man and woman begin to approach each other. derive an expression for the displacement s of the platform when the two meet in terms of the displacement x1 of the man relative to the platform.