Dwayne ‘The Rock’ Johnson needs to escape from the fourth floor of a burning building (in a movie). He ties a rope around his waist and ties the other end to a 63 kg desk. Then he climbs out of a window and begins to lower himself down. The rope becomes taught when he lets go of the window sill. Then the desk begins to slide on the floor and he starts to accelerate downwards (starting from rest). Dwayne has a mass of 118 kg. The smooth window sill acts as a frictionless pulley. The desk is 10 m from the window. The kinetic friction of the desk sliding on the flooris 370 N. How fast is he travelling when th desk reaches the window?(Hint: Unbeknownst to the audience, The Rock aced Physics 1200 and knows that the tension in the rope is not 370 N)
Dwayne ‘The Rock’ Johnson needs to escape from the fourth floor of a burning building (in a movie). He ties a rope around his waist and ties the other end to a 63 kg desk. Then he climbs out of a window and begins to lower himself down. The rope becomes taught when he lets go of the window sill. Then the desk begins to slide on the floor and he starts to accelerate downwards (starting from rest). Dwayne has a mass of 118 kg. The smooth window sill acts as a frictionless pulley. The desk is 10 m from the window. The kinetic friction of the desk sliding on the flooris 370 N. How fast is he travelling when th desk reaches the window?(Hint: Unbeknownst to the audience, The Rock aced Physics 1200 and knows that the tension in the rope is not 370 N)
College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
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Dwayne ‘The Rock’ Johnson needs to escape from the fourth
floor of a burning building (in a movie). He ties a rope around
his waist and ties the other end to a 63 kg desk. Then he climbs
out of a window and begins to lower himself down. The rope
becomes taught when he lets go of the window sill. Then the desk
begins to slide on the floor and he starts to accelerate downwards
(starting from rest). Dwayne has a mass of 118 kg. The smooth
window sill acts as a frictionless pulley.
The desk is 10 m from the window. The kinetic friction of the desk sliding on the flooris 370 N.
How fast is he travelling when th desk reaches the window?(Hint: Unbeknownst to the audience,
The Rock aced Physics 1200 and knows that the tension in the rope is not 370 N)
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