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A small block of mass m slides frictionlessly along a loop track as shown in Figure 36. (a) The block is released from rest at

A small block of mass m slides frictionlessly along a loop track as shown in Figure 36. (a) The block is released from rest at point P. What is the net force acting about him at point Q? (b) From what height above the bottom of the loop should the block be released so that it comes close to losing contact with the track at the top of the loop? 


27. Un pequeo bloque de masa m se desliza sin friccin a lo largo de una pista en rizo como se muestra en la

27. Un pequeo bloque de masa m se desliza sin friccin a lo largo de una pista en rizo como se muestra en la figura 36. (a) El bloque se suelta desde el reposo en el punto P. Cul es la fuerza neta que acta sobre l en el punto Q? (b) Desde qu altura sobre el fondo del rizo debera soltarse el bloque de modo que llegue a punto de perder el contacto con la pista en la parte superior del rizo? Figura 36 Problema 27. R Q

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