Adisk of radius 10 cm is pulled along a frictionless surface with a force of 16 n by a string wrapped around the edge. at the instant when 28 cm of string has unwound off the disk, what is the torque exerted about the center of the disk?

Ogle–2013–blg–0723 is an exoplanet that is similar to earth in size and proximity to its star. this exoplanet has mass m=4.18×1024kg and radius r=5.66×106m. an astronaut whose weight on earth is w=735n lands on the planet. a. calculate m, the mass of the astronaut. b. calculate gp? , the acceleration due to gravity on the surface of ogle–2013–blg–0723. c. calculate wp? , the weight of the astronaut on the surface of ogle–2013–blg–0723. d. calculate v, the minimum velocity required to put an object into orbit above ogle–2013–blg–0723. e. calculate t, the time required to complete an orbit around ogle–2013–blg–0723.

The diagram shows a series of volcanic island and a hot spot determine the direction of movement of the tectonic plate that for the island

The ozone hole appears in antarctica during