Question

An essentially spherical boulder the size of several houses sits precariously on a slope above a village, as shown in figure N9.5. If this boulder ever gets loose, will it hit the village? (Hint: First estimate the speed with which the boulder will roll off the cliff. Show that the total center-of-mass kinetic plus rotational energy of a rolling spherical object is :

Answer 1

Conideins the boulder to be phenical tha momint F INMtae ot this boulder is エニ mure Th otational kinutic energy ofhouloler K.ERan १ K.E.nt ー又mu2 The KE of L m Ve K.E.CM Centre of hay Thus Total KE. 2 Wu mu 16