1200 m A.
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- A 4-lblb ball BB is traveling around in a circle of radius r1r1 = 3 ftft with a speed (vB)1(vB)1 = 6 ft/sft/s. The attached cord is pulled down through the hole with a constant speed vrvr = 2 ft/sft/s.(Figure 1) (A) Determine how much time is required for the ball to reach a speed of 12 ft/s. Neglect friction and the size of the ball. Express your answer to three significant figures and include the appropriate units. (B) How far r2 is the ball from the hole when this occurs? Neglect friction and the size of the ball. Express your answer to three significant figures and include the appropriate unitsNEED WITHIN 1HR PLEASE, THANKS 1. A 1200-kg automobile is moving at a speed of 90 km/h when the brakes are fully applied, causing all four wheels to skid. Determine the time required to stop the automobile on dry pavement (μk = 0.75), and on an icy road (μk = 0.10).A 2500-lb automobile is moving at a speed of 60 mi/h when the brakes are fully applied, causing all four wheels to skid. Determine the time required to stop the automobile (a) on dry pavement (μk= 0.75), (b) on an icy road (μk= 0.10).
- A 2000-kg automobile starts from rest at point A on a 6° incline and coasts through a distance of 50 m to point B. The brakes are then applied, causing the automobile to come to a stop at point C, 20 m from B. Knowing that slipping is impending during the braking period and neglecting air resistance and rolling resistance, determine the speed of the automobile at point B. The speed of the automobile at point B is ___ m/s.A 2000-kg automobile starts from rest at point A on a 6° incline and coasts through a distance of 150 m to point B. The brakes are then applied, causing the automobile to come to a stop at point C , which is 20 m from B . Knowing that slipping is impending during the braking period and neglecting air resistance and rolling resistance, determine (a) the speed of the automobile at point B, (b) the coefficient of static friction between the tires and the road.To use the principle of work and energy to determine characteristics of a system of particles, including final velocities and positions. The two blocks shown have masses of mA = 56 kg and mB = 74 kg . The coefficient of kinetic friction between block A and the inclined plane is μk = 0.15 . The angle of the inclined plane is given by θ = 40 ∘ . Neglect the weight of the rope and pulley. Determine the magnitude of the normal force acting on block A, NA If both blocks are released from rest, determine the velocity of block B when it has moved through a distance of s = 2.00 m. If both blocks are released from rest, determine how far block A has moved up the incline when the velocity of block B is (vB)2 = 6.25 m/s.
- A block of mass 20 kg is released from rest at the top of a ramp as shown in Figure 4. Thecoeficient of kinetic friction between block and ramp is μk = 0.25. When the block reaches thebottom ramp, it slides onto a belt moving to the right at constant speed, vc = 5 m/s. The kineticfriction coeficient between the block and belt is μk = 0.2. Determine the distance, d that theblock slides along the belt before the block’s velocity matches the velocity of the belt.In order to determine the weight of a freight train of 40 identical boxcars, an engineer attaches a dynamometer between the train and the locomotive. The train starts from rest, travels over a straight, level track, and reaches a speed of 30 mi/h after three minutes. During this time interval, the average reading of the dynamometer is 120 tons. Knowing that the effective coefficient of friction in the system is 0.03 and air resistance is negligible, determine (a) the weight of the train (in tons), (b) the coupling force between boxcars A and B.A 1.5-lb ball that can slide on a horizontal frictionless surface is attached to a fixed point O by means of an elastic cord of constant k= 1 lb/in. and undeformed length 2 ft. The ball is placed at point A, 3 ft from O , and given an initial velocity v0 perpendicular to OA ., allowing the ball to come within a distance d = 9 in. of point O after the cord has become slack. Determine (a) the initial speed v0 of the ball, (b) its maximum speed.
- A 5-kg collar A is at rest on top of, but not attached to, a spring with stiffness k1 = 400 N/m when a constant 150-N force is applied to the cable. Knowing A has a speed of 1 m/s when the upper spring is compressed 75 mm, determine the spring stiffness k2 . Ignore friction and the mass of the pulley.A 76.0-kg skier starts from rest from the top of a 66-m high slope. What is the speed of the skier on reaching the bottom of the slope? (Neglect friction.) A 234-gram ball is thrown at a speed of 36.6 m/s from the top of a 38.4-m high cliff. Determine the impact speed of the ball when it strikes the ground. Assume negligible air resistance.A 2404 lb car is moving up a 7 degree incline as shown. Determine how many seconds will it take for the car to decelerate from 105 ft/s to 35ft/s, if the braking force is equal to 52 lb assuming that deceleration is constant and frictional effects are neglected.