Fig. P12.11 12.11 The coefficients of friction between the load and the flatbed trailer shown are s = 0.40 and 0.30. Knowing that the speed of the rig is 72 km/h, determine the shortest distance in which the rig can be brought to a stop if the load is not to shift. 12.12 A light train made up of two cars is traveling at 90 km/h when the brakes are applied to both cars. Knowing that car A has a mass of 25 Mg and car B a mass of 20 Mg, and that the braking force is 20 IN
Fig. P12.11 12.11 The coefficients of friction between the load and the flatbed trailer shown are s = 0.40 and 0.30. Knowing that the speed of the rig is 72 km/h, determine the shortest distance in which the rig can be brought to a stop if the load is not to shift. 12.12 A light train made up of two cars is traveling at 90 km/h when the brakes are applied to both cars. Knowing that car A has a mass of 25 Mg and car B a mass of 20 Mg, and that the braking force is 20 IN
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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12.11
Transcribed Image Text:Fig. P12.11
200 lb
30°
Fig. P12.13
748
reviewed
B
350 lb
pavement, determine the automobile's braking distance from 90 km/h
when it is (a) going up a 5° incline, (b) going down a 3-percent
incline. Assume the braking force is independent of grade.
12.10 A mother and her child are skiing together, and the mother is
holding the end of a rope tied to the child's waist. They are moving
at a speed of 7.2 km/h on a gently sloping portion of the ski slope
when the mother observes that they are approaching a steep descent.
She pulls on the rope with an average force of 7 N. Knowing the
coefficient of friction between the child and the ground is 0.1 and the
angle of the rope does not change, determine (a) the time required
for the child's speed to be cut in half, (b) the distance traveled in
this time.
Fig. P12.10
20 kg
12.11 The coefficients of friction between the load and the flatbed trailer
shown are , = 0.40 and = 0.30. Knowing that the speed of the
rig is 72 km/h, determine the shortest distance in which the rig can
be brought to a stop if the load is not to shift.
May
belon
Testi
12.12 A light train made up of two cars is traveling at 90 km/h when the
brakes are applied to both cars. Knowing that car A has a mass of
25 Mg and car B a mass of 20 Mg, and that the braking force is
30 kN on each car, determine (a) the distance traveled by the train
before it comes to a stop, (b) the force in the coupling between the
cars while the train is slowing down.
90 km/h
25 Mg
Fig. P12.12
20°
B
20 Mg
12.13 The two blocks shown are originally at rest. Neglecting the masses
of the pulleys and the effect of friction in the pulleys and between
block A and the incline, determine (a) the acceleration of each block.
(b) the tension in the cable.
12.14 Solve Prob. 12.13, assuming that the coefficients of friction between
block A and the incline are , = 0.25 and μ = 0.20.
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