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- 1. A cart is being pulled by a motor. The cart has a mass of m = 200 kg. The motor applies a horizontal force of F = 800 N to the center of the right side of the cart. The cart is 1m tall, the total length is 1.5m, the wheels are 1m apart from each other, and the center of mass G is 0.4 m above the floor and on the horizontal center. Ignore friction. If there is no rotational movement of the cart, determine the following: 1. The cart's acceleration 2. The reaction (normal) force at the front pair of wheels. 3. The reaction (normal) force at the rear pair of wheels. F 77 TI TBlock A rests on a horizontal tabletop. A light horizontal rope is attached to it and passes over a pulley, and block B is suspended from the free end of the rope. The light rope that connects the two blocks does not slip over the surface of the pulley (radius 0.080 m) because the pulley rotates on a frictionless axle. The horizontal surface on which block A (mass 2.50 kg) moves is frictionless. The system is released from rest, and block B (mass 5.00 kg) moves downward 1.80 m in 2.00 s. A)What is the tension force that the rope exerts on block B ?B)What is the tension force that the rope exerts on block A ?The illustrated system shows a pulley A that rotates under the effect of an external torque M. The belt that surrounds pulley A tries to stop it unsuccessfully, resulting in pulley A rotating at a constant speed while the belt is fixed. The belt in turn passes through an idle pulley B (frictionless pulley) and pulls a block of mass m2 that is attached to the wall by a spring. If it is considered that the spring has already been stretched by the effect of the tension of the band and that said block is in a condition of imminent movement in the direction to the left, determine: a) The magnitude of the torque M applied to pulley A in the counterclockwise direction. b) The elongation of the spring for the exposed condition. The values of R₂=400mm, R=300mm, μ-0,35, -0,20, k=1000N/m, m₁=17kg, m₂=12kg Pulley A Idle pulley D Resort m1 M a=60° m₂ 3
- as shown in the attached figure, a block with mass m1 is attached to a massless ideal string. the string wraps around a massless pulley and then wraps around a ,second massless pulley that is attached to block with mass m2 and ultimately attaches to a wall. the whole system is frictionless. a coordinate system is given in the figure given that a2 is the magnitude of the horizontal acceleration of the block with mass m2 , what is T, the tension of the string?NoneIn a porter governor the mass of the central load is 18 kgand the mass of each ball is 2kg. the top arms (254) mm while the bottom arms are (304) mm long. The friction of the sleeve is 20 N. If the top arms make 45 deg with the axis of rotation in the equilibrium position, find the range of the speed of the governor in that position
- A couple of figure skaters are executing a move called the "death spiral" as shown in the image below. The male skater on the left is swinging his partner around him on the ice and we can assume that he is rotating without translating. The coefficient of friction between the female's skates and the ice is 0.02. The male skater is applying a constant moment of 8 lb-ft about the axis of rotation to keep the spin going. If the couple is initially spinning at 5 rad/s, calculate their final angular velocity after 6 seconds. Simplify this problem and treat the female as a 140 lb particle that is spinning 6' from the axis of rotation only in the horizontal plane. For full credit, draw an FBD and clearly define your system using polar coordinates. 8 lb-ft Axis of Rotation 6 ft 11:38 AM Type here to search 58°F Partly sunny 3/30/г022Block A has a weight of 60 lb and block B has a weight of 10 lb. Neglect friction and the mass of the cord and pulleys. The figure shows a system of pulleys and blocks. Block A is located on an inclined surface with a slope of three-fourths. Block B is vertically suspended by a cord that goes over a pulley located at the top end of the inclined surface. The cord then goes downward and to the left, parallel to the slope, then it goes over a pulley fixed to the upper right end of block A. Then the cord goes upward and to the right parallel to the slope. The end of the cord is fixed to the anchor. Determine the speed of block A after it moves 5.7 ft down the plane, starting from rest.The mechanism shown consists of a crank (bar AB), a connecting rod (bar BC) and the piston C that slides on the smooth surface (without friction). The combustion of gasoline produces a force P on the piston and this is kept in equilibrium with the moment M applied in A. The length of the crank is 116 mm, the length of the connecting rod is 183 mm, the force P is 710 N and the angle theta is 0.56 radians. Determine the value of M in Nm.
- 2. A car and its load weighs 40 kN and the center of gravity is 600 mm from the ground and midway between the front and rear wheel which are 3 m apart. The car is brought to rest from a speed of 49 kph in 5 seconds by means of the brakes. Compute the normal force on each of the front wheels of the car. (Neglect friction)A Center Raft A person is standing at one end of a uniform raft of length L that is floating motionless on water, as shown above. The center of mass of the person-raft system is a distance d'from the center of the raft. The person then walks to the other end of the raft. If friction between the raft and the water is negligible, how far does the raft nove relative to the water? L/2 B L C d/2 Ⓡ O d Center of Mass of System 2d inA child starts sledding from rest, going down a 40 m long 7.5° incline, then coasting across a horizontal stretch. The mass of the sled + child is 35 kg, and the coefficient of kinetic friction is 0.060. a. Make force diagrams for the sled + child on both the hill and the horizontal stretch. b. Resolve the weight of the sled + child along and perpendicular to the plane. c. Determine the reaction force on the sled + child. d. Determine the speed of the sled + child at the bottom of the incline. e. How far along the horizontal stretch does the sled + child travel before stopping? f. What is the total time for the ride? g. Determine how much energy that is transferred to thermal energy. h. Determine how much work is done on the sled + child by the gravitational force while the child + sled is moving along the incline. i. By considering the energy of the system and energy transformations, determine the speed of the sled + child at the bottom of the incline. Does your answer agree with part…