Author Question: A dump truck has a large cubical concrete block in its bed. The coefficients of friction between ... (Read 79 times)

folubunmi · **on:** Jul 29, 2018

A dump truck has a large cubical concrete block in its bed. The coefficients of friction between this block and the floor of the bed are k = 0.450 and s = 0.650.

As the bed is slowly tilted above the horizontal, will the brick first begin to slide or will it first tip over?
A) It will first tip over.
B) It will first begin to slide.
C) It will tip over just as it begins to slide.
D) It is impossible to answer without knowing the mass of the block.
E) It is impossible to answer without knowing the dimensions of the block.

Question 2

A 5.0-m long, 12-kg uniform ladder rests against a smooth vertical wall with the bottom of the ladder 3.0 m from the wall.

The coefficient of static friction between the floor and the ladder is 0.28. What distance, measured along the ladder from the bottom, can a 60-kg person climb before the ladder starts to slip?
A) 4.0 m
B) 3.7 m
C) 1.7 m
D) 1.3 m
E) 3.3 m