4. A 100 lb cabinet is placed on a smooth surface. If a force of a 100 lb is applied for 2 s, determine the net impulse on the cabinet during this time interval: A. 0 lbs, B. 200 lb s, C. -100 lb s, or D. 100 lbs. g 00-00 30° +
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- 4. The system shown at right consists of a frictionless pulley and a rope supporting two masses. Use work and energy methods to determine velocity of each mass just before the 12 kg mass hits the floor. Use that velocity to determine acceleration and draw a FBD (with solved forces) of each pulley while they are in motion. 12 kg 1.5 m 8. kg1. A 25-kg box is attached to two light ropes and is being pulled in a frictionless, horizontal floor. The two forces pulling the box is given by: Fjis 15 N due east, and F,is 10 N due north. A. What are the forces acting on the box? Identify whether contact or noncontact force. B. Identify the action-reaction pairs. C. What is the acceleration of the box?A piston cylinder device contains B kg of water at A ° C. The frictionless piston with an area of C m2 initially rests on the stoppers and its cylinder volume is 0.03 m3. The pressure in the cylinder must be D kPa for the piston to activate. As the piston moves upwards, when the cylinder volume is 0.075 m3, it touches the linear spring with a spring coefficient of 360 kN/m. Since the final pressure is E MPa, by showing the state change together with the saturation curves on the P-V diagram, a) The water temperature in the last case,b) The work done during the transaction,c) Calculate the total heat transfer. Note: If you think there is missing data, you can choose appropriate values by making the necessary explanations.
- Khufra works at a spring factory and he was assigned to test a certain spring, whose constant is 50 N/m, attached to a 30-kg block in an incline (θ=30°). With the spring initially at equilibrium position, the block was pushed 0.5 meters up the incline by a 50-N external force applied parallel to the path. If the coefficient of kinetic friction is 0.5, determine the: a) normal force (in Newtons) b) work done by the spring (in Joules)Khufra works at a spring factory and he was assigned to test a certain spring, whose constant is 50 N/m attached to a 50-kg block in an incline (©=30°). With the spring initially at equilibrium position, the block was pushed 0.3 meters up the incline by a 50-N external force applied parallel to the path. The coefficient of kinetic friction is 0.30. d) How much work is done by the block (in Joules) on the spring? e) How much work is done by the applied push on the block? f) How much work is done by friction?A box of mass 20 kg moves up a rough plane which is inclined to the horizontal at 25.0o .It is pulled by a horizontal force F of magnitude 250N . The Coefficient of kinetic friction between thr box and the plane is 0.300 a) if the box travels 3.80 m along the plane determine i. The work done on the box by the force F ii. The work done on the box by gravitational force iii. The work done on the box by reaction force and the work done on the box by frictional force v. total work done on the box b) If the speed of box is zero at bottom plane ,calculate it speed when it travellef 3.80 m (given g=9.81m/s2)
- A weight of W Ib is suspended from a vertical spring (as shown in the figure) whose modulus is k Ib/ft. The weight is pulled down s ft. from its equilibrium position and then released. Determine its velocity when it returns to its equilibrium position. Wsg-kgBlock A is 30kg And Block B is 20 kgm = 40 kg 4) Determine the magnitude and direction of the friction force which the vertical wall exerts on the 40 kg block if (a) 0 = 15° and (b) 0 = 30°. P = 500 N Hs = 0.50 Hk = 0.40
- Q.5) A steel bar OC with attached spring at B and cable at C can rotate freely in a horizontal plane about support at O as shown below. The spring is upstretched when C is coincident with A. Determine the tension T required to hold the steel bar OC in the 40° position shown as a function of k and L. Neglect the weight of the bar OC and the diameter of the pulley at D. 40° L/2 B m T L/2 25°A 2158 lb car starts from rest at point 1 and moves without friction down the track shown. Determine the force (Ib) exerted by the track on the car at point 2 if a = 44 ft, b = 11 ft and r = 29 ft. %3D Round off only on the final answer expressed in 3 decimal places. WE exercise3(1).png 1 a r 2.QUESTION 4 Three identical blocks of mass m on a frictionless surface are connected by massless taut strings. A force Fis applied on the rightmost block as shown in the figure below so that each block moves to right with acceleration a. T2 T1 m F Applying Newton's second law on the rightmost block: EFx = = ma Applying Newton's second law on the block at the center: EFx = |- T2 = Applying Newton's second law on the leftmost block: EFx = = ma If each block has a mass of 10 kg and is accelerating at 2 m/s-, the magnitude of the tension on the second string is T2= N.