The 20-kg crate is lifted by a force of F = (100+ 512) N where t is in seconds. Determine how high the crate has moved upward when = 3 s, starting from rest. B

The slotted arm OA rotates about a fixed axis through O. At the instant under consideration, 0 = 34°, 0 = 43 deg/s, and 0 = 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. Part 1 -L B Answer: ay = i m Slider B moves only vertically (the y-direction). Find the acceleration (positive if up, negative if down). B m y m/s²

The casting has a mass of 4 Mg, suspended in a vertical position and initially at rest, it is given an upward speed of 2 m/s in 5 s using a crane hook H. Determine the tension in cables AC and AB during this time interval if the acceleration is constant. Assume that the tension in cables AC and AB are equal. 30-30° Select one: a. 17.86 kN b. 23.58 kN O c. 12.25 kN O d. 25.54 kN Previous page Next page

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 m

Using a forked rod, a smooth cylinder P, having a mass of 0.4 kg, is forced to move along the vertical slotted path r- (0.60) m, where e is in radians. If the cylinder has a constant speed of te- 2 m/s, determine the force of the rod and the normal force of the slot on the cylinder at the instant e- rad. Assume the cylinder is in contact with only one edge of the rod and slot at any instant. Hint To obtain the time derivatives necessary to compute the cylinder's acceleration components a, and a, take the first and second time derivatives of r- 0.60. Then, for further information, use Eq. 12-26 to determine 8. Also, take the time derivative of Eq. 12-26, noting that te - 0, to determine 8. -060

Q1. The slender 15 kg bar is initially at rest and standing in the vertical position when the bottom end A is displaced slightly to the right. If the track in which it moves is smooth, determine the speed at which end A strikes the corner D. The bar is constrained to move in the vertical plane. Neglect the mass of the cord BC. 4 m 5 m 4 m D

Determine the speed v which the 655-kg four-man bobsled must have in order to negotiate the turn without reliance on friction. Also find the net normal force Nexerted on the bobsled by the track. 38 -p = 52 m Answers: V = i m/s N = i kN

Determine the required mass of block A so that wnen it is released from rest it moves the 5-kg block Ba distance of 0.75 m up along the smooth inclined plane in t = 2 s. Neglect the mass of the pulleys and cords. 2. B 60°

-y = 45 - hft k lblft www Ift The 5-lb collar has a speed of 3 ft.s1 at A. The attached spring has an unstretched length of 2- ft and a stiffness of k=17lb.ft1. If the collar moves over the smooth rod, determine its speed when it reaches point B. The height of A is h=9-ft and B is at l=4-ft from the vertical of A

The 1.9-kg slider is released from rest in position A and slides without friction along the vertical-plane guide. Determine the normal force exerted by the guide on the slider (a) just before it passes point C, (b) just after it passes point C, and (c) just before it passes point E. The normal forces are positive if they point up and/or to the left, negative if they point down and/or to the right.