| At a construction site, a pallet of bricks is to be suspended by attaching a rope to it and connecting the other end to a couple of heavy crates on the roof of a building, as shown in Figure 5.53. The rope pulls horizontally on the lower crate. and the coefficient of static friction between the lower crate and the roof is 0.666. (a) What is the weight of the heaviest pallet of bricks that can be supported this way? Start with appropriate free-body diagrams. (b) What is the friction force on the upper crate under the conditions of part (a)? Figure 5.53 Problem 27.
| At a construction site, a pallet of bricks is to be suspended by attaching a rope to it and connecting the other end to a couple of heavy crates on the roof of a building, as shown in Figure 5.53. The rope pulls horizontally on the lower crate. and the coefficient of static friction between the lower crate and the roof is 0.666. (a) What is the weight of the heaviest pallet of bricks that can be supported this way? Start with appropriate free-body diagrams. (b) What is the friction force on the upper crate under the conditions of part (a)? Figure 5.53 Problem 27.
| At a construction site, a pallet of bricks is to be suspended by attaching a rope to it and connecting the other end to a couple of heavy crates on the roof of a building, as shown in Figure 5.53. The rope pulls horizontally on the lower crate. and the coefficient of static friction between the lower crate and the roof is 0.666. (a) What is the weight of the heaviest pallet of bricks that can be supported this way? Start with appropriate free-body diagrams. (b) What is the friction force on the upper crate under the conditions of part (a)?
12. QCA block of mass 3.00 kg is pushed up against a wall by a
force P that makes an angle of 0 50.0° with the horizontal
as shown in Figure P5.12. The coeffi-
cient of static fric tion between the block
and the wall is 0.250. (a) Determine the
possible values for the magnitude of P
that allow the block to remain station-
ary. (b) Describe what happens if |P
has a larger value and what happens if it
is smaller. (c) Repeat parts (a) and (b),
assuming the force makes an angle of
0 13.0° with the horizontal.
Figure P5.12
12. QCA block of mass 3.00 kg is pushed up against a wall by a force P that makes an angle of 0 = 50.0° with the horizontal as shown in Figure P5.12. o The coefficient of static friction be- g tween the block and the wall is 0.250. (a) Determine the possible values for the magnitude of P that allow the block to remain stationary. (b) De- scribe what happens if P| has a larger value and what hap- pens if it is smaller. (c) Repeat parts (a) and (b), assuming the force makes an angle of 0 = 13.0° with the horizontal.
Calculate the tension (in N) in a vertical strand of spiderweb if a spider of mass 5.00 x 10¯5 kg hangs motionless on it.
Calculate the tension (in N) in a horizontal strand of spiderweb if the same spider sits motionless in the middle of it much like the tightrope walker
5.0°
5.00
T.
TR
y 4
T.I TR
The strand sags at an angle of 11.0° below the horizontal.
Compare this with the tension in the vertical strand (find their ratio).
tension in horizontal strand
tension in vertical strand
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