Alarge heavy rock, a medium size stone and a small marble are dropped at the same time from the roof of a building. neglecting air resistance, which object will strike the ground first?

A150 w lamp emits light of wavelength 590 nm uniformly in all directions. what is the photon flux (photons per unit area per unit time) on a small screen at a distance 2.3 m from the lamp? assume the photons are uniformly distributed over the surface of a sphere of radius 2.3 m.

Imagine that someone pushes one marble toward a motionless marble. would there still be action-reaction forces involved in the collision? how might the marbles’ motions be changed? ?

What is the relationship between the direction of motion of the balloon and the wind currents