PEARSON ETEXT ENGINEERING MECH & STATS
15th Edition
ISBN: 9780137514724
Author: HIBBELER
Publisher: PEARSON
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2. A force is applied to block A at angle of 40 degrees with the horizontal.
Determine the friction force and the acceleration of block A in the system
below if the coefficient of friction between A and the surface is 0.4. (Normal
Force, N = 450N)
Sign
convention
15N
250 kg
A
B
75 kg
The 33-kg crate is stationary when the force Pis applied. Determine the resulting acceleration of the crate if (a) P = 0, (b) P = 143 N,
and (c) P = 322 N. The acceleration is positive if up the slope, negative if down the slope.
H, = 0.37
H = 0.29
33 kg
25
Part 1
X Incorrect
Part (a). We need to decide if the block moves. The easy way to make this decision is to assume that the block does not move and
then to test this assumption. If P = 0, what friction force F is needed to keep the block from moving?
mg
N
Answer: F =
i
3.034
N
Find the acceleration ay
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- A worker develops a tension Tin the cable as he attempts to move the 50-kg cart up the 20° incline. Determine the resulting acceleration a of the cart if (a) T = 132 N and (b) T = 196 N. Neglect all friction, except that at the worker's feet. The acceleration a is positive if up the slope, negative if down the slope. T 50 kg 150 20° Answers: (a) T= 132 N, a = i m/s? (b) T = 196 N, a = i m/s?arrow_forwardThe 33-kg crate is stationary when the force Pis applied. Determine the resulting acceleration of the crate if (a) P = 0, (b) P = 143 N, and (c) P = 322 N. The acceleration is positive if up the slope, negative if down the slope. H, = 0.37 HE = 0.29 33 kg 25 Part 1 Part (a). We need to decide if the block moves. The easy way to make this decision is to assume that the block does not move and then to test this assumption. If P = 0, what friction force F is needed to keep the block from moving? mg P Answer: F = i Narrow_forwardA 60-kg block is at rest when an upward force parallel to the 15° surface is applied. If uk =0.18, and ,us= 0.23, a. Determine the acceleration if P=180N. b. Determine the acceleration if P=320N.arrow_forward
- Q2: The safe S has weight Ws and is supported by the rope and pulley arrangement shown. If the end of the rope is given to a boy B of weight Wb, determine his acceleration if in the confusion he doesn't let go of the rope. Neglect the mass of the pulleys and rope. Given: Ws = 200 lb, Wb = 90 lbarrow_forward2. A mass of 0.10 slug in space is subjected to an external vertical force of 3 lb. If the local g=32.2ft/s? and if friction effects are neglected determine the acceleration of the mass if the external vertical force is acting a. Upward b. downwardarrow_forward(24) A man pulls himself up the 150 incline by the method shown. If the pulls himself up the 15º incline by the method shown. If the 250 lb, determine the acceleration of the cart if the man exerts a pull of 60 lb on the rope. Neglect all frictions and the mass of the rope, pulleys and wheels. SOLUTION 15°arrow_forward
- The slotted arm OA rotates about a fixed axis through O. At the instant under consideration, 0 = 34°, 0 = 43 deg/s, and Ö = 28 deg/s². Determine the magnited of the force F applied by arm OA and the magnitude of the force N applied by the sides of the slot to the 0.6-kg slider B. Neglect all friction, and let L = 0.75 m. The motion occurs in a vertical plane. 0 -L- B marrow_forwardThe 19-Mg truck hauls the 40-Mg trailer. If the unit starts from rest on a level road with a tractive force of 23 kN between the driving wheels of the truck and the road, compute the tension T in the horizontal drawbar and the acceleration a of the rig.arrow_forwardThe 52-kg crate is stationary when the force Pis applied. Determine the resulting acceleration of the crate if (a) P = 0, (b) P = 157 N, and (c) P = 454 N. The acceleration is positive if up the slope, negative if down the slope. H, = 0.34 H = 0.24 52 kg 23arrow_forward
- a horizontal force P = 25 lb is applied to block A Determine the acceleration of the block B. Neglect friction. a =arrow_forwardThe 55-kg crate is stationary when the force P is applied. Determine the resulting acceleration of the crate if (a) P = 0, (b) P = 154 N, and (c) P = 362 N. The acceleration is positive if up the slope, negative if down the slope. 16 55 kg H₂=0.23 Hh=0.17arrow_forward4arrow_forward
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