Problem 4.64 Find u such that the crate's speed at the bottom of the chute (immedi- ately before the crate's trajectory becomes horizontal) is 15 ft/s.

International Edition---engineering Mechanics: Statics, 4th Edition
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Chapter7: Dry Friction
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I only need problem number 64 I'm having trouble 

Problems 4.63 through 4.65
A crate, initially traveling horizontally with a speed of 18 ft/s, is made to slide down a
14 ft chute inclined at 35°. The surface of the chute has a coefficient of kinetic friction u.
and at its lower end, it smoothly lets the crate onto a horizontal trajectory. The horizontal
surface at the end of the chute has a coefficient of kinetic friction u2. Model the crate
as a particle, and assume that gravity and the contact forces between the crate and the
sliding surface are the only relevant forces.
14 ft
MK2
35°
5 ft
Figure P4.63-P4.65
Transcribed Image Text:Problems 4.63 through 4.65 A crate, initially traveling horizontally with a speed of 18 ft/s, is made to slide down a 14 ft chute inclined at 35°. The surface of the chute has a coefficient of kinetic friction u. and at its lower end, it smoothly lets the crate onto a horizontal trajectory. The horizontal surface at the end of the chute has a coefficient of kinetic friction u2. Model the crate as a particle, and assume that gravity and the contact forces between the crate and the sliding surface are the only relevant forces. 14 ft MK2 35° 5 ft Figure P4.63-P4.65
Mk2
k
Mww
35°
5 ft
Figure P4.63-P4.65
Problem 4.63 If u = 0.35, what is the speed with which the crate reaches the bottom
of the chute (immediately before the crate's trajectory becomes horizontal)?
Problem 4.64 Find u such that the crate's speed at the bottom of the chute (immedi-
ately before the crate's trajectory becomes horizontal) is 15 ft/s.
= 0.5 and suppose that, once the crate reaches the bottom of
Problem 4.65 Let uk
the chute and after sliding horizontally for 5 ft, the crate runs into a bumper. If the weight
of the crate is W = 110lb, Hk2 = 0.33, modeling the bumper as a linear spring with
constant k, and neglecting the mass of the bumper, determine the value of k so that the
crate comes to a stop 2 ft after impacting with the bumper.
Transcribed Image Text:Mk2 k Mww 35° 5 ft Figure P4.63-P4.65 Problem 4.63 If u = 0.35, what is the speed with which the crate reaches the bottom of the chute (immediately before the crate's trajectory becomes horizontal)? Problem 4.64 Find u such that the crate's speed at the bottom of the chute (immedi- ately before the crate's trajectory becomes horizontal) is 15 ft/s. = 0.5 and suppose that, once the crate reaches the bottom of Problem 4.65 Let uk the chute and after sliding horizontally for 5 ft, the crate runs into a bumper. If the weight of the crate is W = 110lb, Hk2 = 0.33, modeling the bumper as a linear spring with constant k, and neglecting the mass of the bumper, determine the value of k so that the crate comes to a stop 2 ft after impacting with the bumper.
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