Block A has a mass of 50 kg, and block B has a mass of 15 kg. They are stacked, connected by a cable running through frictionless pulleys, and positioned on a slope of 0 = 30°. The coefficient of kinetic friction between all surfaces of contact is μ = 0.25. The applied force is P = 75 N. Assume the force is sufficient for the blocks to start moving. k Determine (a) the acceleration of block B, (b) the tension in the cord.

Block A has a mass of 50 kg, and block B has a mass of 15 kg. They are stacked, connected by a cable running through frictionless pulleys, and positioned on a slope of 0 = 30°. The coefficient of kinetic friction between all surfaces of contact is μ = 0.25. The applied force is P = 75 N. Assume the force is sufficient for the blocks to start moving. k Determine (a) the acceleration of block B, (b) the tension in the cord.

International Edition---engineering Mechanics: Statics, 4th Edition

4th Edition

ISBN:9781305501607

Author:Andrew Pytel And Jaan Kiusalaas

Publisher:Andrew Pytel And Jaan Kiusalaas

Chapter7: Dry Friction

Section: Chapter Questions

Problem 7.79P: The coefficient of rolling resistance between the 30-kg lawn roller and the ground is r=0.1. (a)...

See similar textbooks

Similar questions

The 600-lb cable spool is placed on a frictionless spindle that has been driven into the ground. If the force required to start the spool rotating is F = 160 lb, determine the coefficient of friction between the ground and the spool. Neglect the diameter of the spindle compared to the diameter of the spool.
Block A of mass m is placed on the inclined surface of wedge B. The static coefficient of friction between A and B is 0.4. Determine the smallest acceleration a of the wedge that would cause the block to slide up the inclined surface. * A. 4= 0.4 20°
A 1.6-kg sphere S is being moved in a vertical plane by a robotic arm. When the angle e is 38, the angular velocity of the arm about a horizontal axis through O is 55 deg/s clockwise and its angular acceleration is 205 deg/s² counterclockwise. In addition, the hydraulic element is being shortened at the constant rate of 440 mm/s. Determine the necessary minimum gripping force Pif the coefficient of static friction between the sphere and the gripping surfaces is 0.51. Compare Pwith the minimum gripping force P; required to hold the sphere in static equilibrium in the 38° position. 1.5 m Answers: P = i Ps= i
A 2.2-kg sphere S is being moved in a vertical plane by a robotic arm. When the angle is 36°, the angular velocity of the arm about a horizontal axis through O is 45 deg/s clockwise and its angular acceleration is 176 deg/s² counterclockwise. In addition, the hydraulic element is being shortened at the constant rate of 550 mm/s. Determine the necessary minimum gripping force P if the coefficient of static friction between the sphere and the gripping surfaces is 0.58. Compare P with the minimum gripping force P, required to hold the sphere in static equilibrium in the 36° position. 1.0 m $ Answers: P= Ps= i i N N
A 1.7-kg sphere S is being moved in a vertical plane by a robotic arm. When the angle e is 24°, the angular velocity of the arm about a horizontal axis through O is 57 deg/s clockwise and its angular acceleration is 222 deg/s² counterclockwise. In addition, the hydraulic element is being shortened at the constant rate of 430 mm/s. Determine the necessary minimum gripping force Pif the coefficient of static friction between the sphere and the gripping surfaces is 0.56. Compare P with the minimum gripping force P3 required to hold the sphere in static equilibrium in the 24° position. 2.1 m Answers: P = i N P = i
6. A car weighing 5000-kg is on a banked curve as shown. The coefficient of friction between the road and the tire of the car is 0.50. It is rounding the curve of 200 m radius at maximum speed. Determine the maximum speed and the frictional force acting on the wheels. 3 D 11 2.5
A 2.6-kg sphere S is being moved in a vertical plane by a robotic arm. When the angle 0 is 39°, the angular velocity of the arm about a horizontal axis through O is 52 deg/s clockwise and its angular acceleration is 220 deg/s² counterclockwise. In addition, the hydraulic element is being shortened at the constant rate of 520 mm/s. Determine the necessary minimum gripping force Pif the coefficient of static friction between the sphere and the gripping surfaces is 0.61. Compare P with the minimum gripping force P; required to hold the sphere in static equilibrium in the 39° position. 2.0 m Answers: P = i 16.92 N P3 = 20.90 N
A 2.6-kg sphere S is being moved in a vertical plane by a robotic arm. When the angle 0 is 39°, the angular velocity of the arm about a horizontal axis through O is 52 deg/s clockwise and its angular acceleration is 220 deg/s2 counterclockwise. In addition, the hydraulic element is being shortened at the constant rate of 520 mm/s. Determine the necessary minimum gripping force Pif the coefficient of static friction between the sphere and the gripping surfaces is 0.61. Compare Pwith the minimum gripping force P, required to hold the sphere in static equilibrium in the 39° position. 2.0 m Answers: P = i P3 = N
The lower block of mass m2 = 3.2 kg is pulled on by a rope with a tension force of 28 N. The upper block has mass m1 = 1.8 kg. The coefficient of kinetic friction between the lower block and the surface is 0.32. The coefficient of kinetic friction between the lower block and the upper block is also 0.32. What is the acceleration of the 3.2 kg block?
Help me please
A 1.4-kg sphere S is being moved in a vertical plane by a robotic arm. When the angle e is 37°, the angular velocity of the arm about a horizontal axis through O is 45 deg/s clockwise and its angular acceleration is 166 deg/s² counterclockwise. In addition, the hydraulic element is being shortened at the constant rate of 450 mm/s. Determine the necessary minimum gripping force Pif the coefficient of static friction between the sphere and the gripping surfaces is 0.59. Compare P with the minimum gripping force P; required to hold the sphere in static equilibrium in the 37° position. 1.3 m Answers: P = i N P3 = N
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