PEARSON ETEXT ENGINEERING MECH & STATS
15th Edition
ISBN: 9780137514724
Author: HIBBELER
Publisher: PEARSON
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Problem: The motorcycle shown in Fig. below has a mass of 125 kg
and a center of mass at G1 , while the rider has a mass of 75 kg
and a center of mass at G2 . Determine the minimum coefficient
of static friction between the wheels and the pavement in order
for the rider to do a "wheely,“ i.e., lift the front wheel off the
ground as shown in the photo. What acceleration is necessary to
do this? Neglect the mass of the wheels and assume that the front
wheel is free to roll.
G2
0.3 m
0.6 m
B-
0.4 m 0.4 m
0.7 mA
Problem 4: A truck is towing a car. mtruck
move. The truck is 4-wheel drive vehicle with the coefficient of static friction between the tires of the truck and the ground of µ. The
= 3mcar. Draw the Kinetic FBD’s of the car and the truck at the instant the car begins to
car wheels are free to roll.
Find the value s so that the worker can climb the ladder without causing it to slip. The
weight of the worker is 90-kg and neglect the weight of the ladder. The ladder has a small
roller at the top and at the ground the coefficient of static friction is 0.25. The center of
mass of the worker is directly above her feet.
B
4 m
1.5 m
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- The 3600-lb car with rear Wheel drive is attempting to tow the 4500-lb crate. The center of gravity of the car is at G, and the coefficients of static friction are 0.6 at B and 0.2 at C. Determine if the crate will slide.arrow_forwardThe single-threaded screw of the floor jack has a pitch of 0.5 in. and a mean radius of 1.75 in. The angle of static friction is 8.5. (a) Determine the couple C that must be applied to the screw to start lifting a weight of 4000 lb. (b) What is the couple required to start lowering the weight?arrow_forwardThe block of weight W is pulled by the force P inclined at the angle to the horizontal. Find the smallest force P and the corresponding angle that would cause impending sliding of the block. The angle of static friction between the block and the ground is s.arrow_forward
- The square-threaded screw with a pitch of 10 mm and a mean radius of 18 mm drives a gear that has a mean radius of 75 mm. The static and kinetic coefficients of friction between the gear and the screw are 0.12 and 0.06, respectively. The input torque applied to the screw is C0=10Nm. Assuming constant speed operation, determine the output torque C1 acting on the gear.arrow_forwardThe 40-lb spool is suspended from the hanger GA and rests against a vertical wall. The center of gravity of the spool is at G and the weight of the hanger is negligible. The wire wound around the hub of the spool is extracted by pulling its end with the force P. If the coefficient of static friction between the spool and the wall is 0.25, determine the smallest P that will extract the wire.arrow_forwardThe coeffient of static friction between the uniform bar AB of weight W and the ground is 0.45. Find the smallest angle and the corresponding force P that would initiate simultaneous tipping and sliding of the bar.arrow_forward
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