The horizontal force P = 90 N is applied to the upper block with the system initially stationary. The block masses are mA = 14.4 kg and mB = 5.1 kg. Use g = 9.81 ms-2. Determine the magnitude of the frictional force that block B exerts on block A. The coefficients of static friction are µ1 = 0.40 and µ2 = 0.50. The coefficients of kinetic friction are 75% of the respective static values.

The man pushes on the roller with force P through a handle that connects to the central axle of the roller. If the coefficient of static friction between the 43-lb roller and the floor is g = 0.16, determine the maximum force P that can be applied to the handle, so that roller rolls on the ground without slipping. Assume the roller to be a uniform cylinder. Please pay attention: the numbers may change since they are randomized. Your answer must include 2 places after the decimal point, and proper unit. Take g = 32.2 ft/s². Your Answer: Answer 30° units 1.5 ft

A package of mass m is placed inside a drum that rotates in the verticalplane at the constant angular speed ˙ θ = 1.36 rad/s. If the package reaches the position θ = 45◦ before slipping, determine the static coefficient of friction between the package and the drum.

Blocks A and B weigh 50 Ib and 30 lb, respectively. Using the coefficients of static friction indicated, determine the greatest weight of block E without causing motion.

The dresser has a weight of 80 lb and is pushed along the floor as shown in (Figure 1). Assume h = 3.5 ft. The coefficient of static friction at A and B is μ = 0.28 and the coefficient of kinetic friction is μ = 0.2. Figure 2.5 ft A -1.5 ft-1.5 ft- B < 1 of 1 Part A Determine the smallest horizontal force P needed to cause motion. Express your answer in pounds to three significant figures. VE ΑΣΦ 41 Ivec P= 30.0 Submit Part B X Incorrect; Try Again; 2 attempts remaining a = Submit Part C Previous Answers Request Answer If force P is increased slightly, determine the acceleration of the dresser. Express your answer in feet per squared second to three significant figures. Enter positive value if the acceleration is to the right and negative value if the acceleration is to the left. VE ΑΣΦ 11 Ivec ↑ NA. NB = Request Answer IVE ΑΣΦ | 11 ? vec lb ? Also, what are the normal reaction at A and B when it begins to move? Express your answers in pounds using three significant figures separated…

The coefficient of friction between all surfaces is us = 0.4 and μK = 0.3. The mass of A is 11 kg and the mass of B is 36 kg. Assume the pulley is mass less and frictionless. Determine the smallest force P required to keep the system moving. P A A B

1) Determine the average braking torque to be applied to stop the vehicle of mass 1.5 ton is movingdown the hill at a slope of 1:7 at 60 kmph and the vehicle is to be stopped at a distance of 50 m.Take the diameter of the vehicle tyre as 500 mm. If the friction energy is momentarily stored in a20 kg cast iron brake drum, what is the average temperature rise of the drum? The specific heat forcast iron may be taken as 520 J/kg ˚C.

5) The crate at a 10° incline has a mass of 350 kg and is subjected to a towing force P acting at a 20° angle with the horizontal. If the coefficient of static friction is µs = 0.5, determine the magnitude of P needed start impending motion. Given: M = 350 kg = 20 deg = 10 deg Us = 0.5 m g = 9.81

Determine the force P required to force the 15° wedge under the 95-kg uniform crate which rests against the small stop at A. The coefficient of friction for all surfaces is 0.36.

I UBC Engineering The 4 kg block sits on the edge of a disk with a radius of r = 1.25m. a. Assuming the block does not slip, what would be the force of friction between the block and the disk if the disk is rotating at a constant angular velocity of rad 1.1 ? S F = 6.05 * N b. If the disk then begins to slow down and the coefficient of static friction between the block and the disk is μs = 0.278, what is the magnitude of the maximum initial angular decceleration that would not cause the block to slide on the disk? Maximum a = 2.18 ☑ rad $2