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1 A 3.00kg crate slides down a ramp at a loading dock. The ramp is 1.00m long and an inclined at Physics 11 an angle of 30%. The crate starts from rest and moves a short distance on the flat floor. Non-conservative System and Open/Closed system Determine the speed of the crate when it reaches the bottom of the ramp. (3. I m/s) 7) A 5kg box starting from rest slides down a frictionless incline with a height of 10m(1) and reaches the flat surface of the track (2). The box then slides on a surface that has a coefficient of kinetic friction for 2. A 10kg block is on a 250 incline being pushed up by 400N. The force of friction between the 10m (3). Then the box slides on a frictionless surface again up the incline with a height of 5m (4). incline and the block is Uk =0.2. Find the Net work done on the object if is displaced by 5m 3 upwards. ( 17043) Kinetic 3. A bullet has a mass of 2.60g and a velocity of 335m/s. It can penetrate 15.2cm of a 5kg box Potential - Gravity made out of wood. What is the average stopping force exerted by the wood? (959.8N) Total Energy Lost 4. A 3.00kg crate slides down a ramp at a loading dock. The ramp is 1.00m long and an inclined at an angle of 30. The crate starts from rest and moves a short distance on the flat floor. Determine the speed of the crate when it reaches the bottom of the ramp. (2.54m/S) 3.13 5. In the chart below fill the energy of the ball at the numbered part of the track. The ball has a mass of 10m 10kg and starts from rest. 2 3 4 H = 0.3 Potential - Gravity 10 kg 3 Kinetic Total 8). The box slides on a frictionless incline from rest (1). Then reaches a flat surface on the track (2). Then the box goes around the frictionless loop (3). Afterwards, the box encounters a 30 incline with a coefficient of friction of Hx=0.3 and a height of 5m (4). Lastly, the box slides back to a frictionless flat 3 surface (5). 3 4 5 5 m 4 ) 3m Potential - Gravity Kinetic Total 2 m Energy Lost 6. A child of mass M holds onto a rope and steps off a platform. Assume that the initial speed of the 3 child is zero. The rope has length R and negligible mass. The initial angle of the rope with the vertical is 0o, as shown in the drawing above. a. Using the principle of conservation of energy, develop an expression for the speed of the child at the 8 m MK : 0.3 1 lowest point in the swing in terms of g, R, and cos 0. Hint: What is the starting height and the final height? 4 : 30' 9). A 0.20kg rocket in a firework display is launched from rest and follows an erratic flight path to reach point p. Point P is 29m above the starting point. In the process, 425J of work is done on the rocket by the non-conservative force generated by the burning propellant. Ignore air resistance and the change in R mass as the fuel is burnt. Find the find speed of the rocket at point P. (60.67m/s)