Chapter 15, Problem 28P

At the instant shown the 40 kg block A is moving down the plane, while being attached to the 8 kg block B. If the coefficient of kinetic friction between the block and the incline and other surface is µs = 0.2 and µx = 0.15, determine the acceleration of block B, and the tension in the cord. Neglect the mass of the pulleys and cables.

The initially stationary 23-kg block is subjected to the time-varying force whose magnitude P is shown in the plot. Note that the force is zero for all times greater than 5 s. Determine the time ts at which the block comes to rest. Mk S Hs = 0.45 Answe: ts i = 0.59 = 23 kg 25° P, N 152 0 5 t, s

The spring in the toy gun has an unstretched length of 95 mm. It is compressed and locked in the position shown. When the trigger is pulled, the spring unstretched 10.5 mm, and the 23-gg ball moves along the barrel. Determine the speed of the ball when it leaves the gun. Neglect friction.

Please help immediately, I will leave a thumb up

The 250-N block rests upon a level plane for which fk = 0.2. It is pulled by force P= 100N inclined at 20o with the horizontal. Find the velocity of the block after it moves 20m starting from rest.

The 16-Mg truck hauls the 37-Mg trailer. If the unit starts from rest on a level road with a tractive force of 21 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. Answers: T = a = i 37 Mg KN m/s² 16 Mg

. The 2.5-Mg four-wheel-drive SUV tows the 1.5-Mg trailer. The traction force developed at the wheels is FD = 9 kN. Determine the speed of the truck in 20 s, starting from rest. Also, determine the tension developed in the coupling, A, between the SUV and the trailer. Neglect the mass of the wheel

= 0, and then it is subjected to the force P shown. Note 20 sec. If μs 0.6, k = 0.4, and 0 = 25°, determine The 100-lb block is stationary at time t that the force is zero for all times beyond t = the velocity v of the block at time t = = 25 sec. Also, calculate the time t at which the block comes to rest again. (v = 89.4 ft/sec, the block never stops) P P,lb 15 W μς, μκ Ꮎ t, sec 0 10 20

The initially stationary 100-lb block is subjected to the time-varying force whose magnitude P is shown in the plot. Determine the speed v of the block at times t = 1, 3, 5, and 7 sec. Note that the force P is zero after t= 6 sec.