hw2-phys-2425-MMV

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Lone Star College System, North Harris *

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2425

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Physics

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Dec 6, 2023

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docx

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PHYS-2425 HOME WORK # 2 v.1 Instructor: Dr. Orion CIFTJA Name: Melody Martinez Villanueva Class: PHYS-2425 6001 Date: 10/12/2023 Identify the choice that best completes the statement or answers the question. Keep 2 digits after the decimal point when rounding numerical values. 1) A toy rocket is launched vertically from ground level ( y = 0.00 m), at time t = 0.00 s. The rocket engine provides constant upward acceleration during the burn phase. At the instant of engine burnout, the rocket has risen to 72 m and acquired a velocity of 30 m/s. The rocket continues to rise in unpowered flight, reaches maximum height, and falls back to the ground with negligible air resistance. The speed of the rocket at 36 m above ground is closest to 40.07 m/s 2) A ball is thrown with an angle of 30 o above the horizon at time t = 0.00 s, from a point on a roof 70 m above the ground and experiences negligible air resistance. The ball rises, then falls and strikes the ground. The initial speed of the ball is 28.5 m/s. Consider all quantities as positive in the upward direction. The magnitude of the vertical velocity of the ball when it is 29 m above the ground is closest to 9.22 m/s_ 3) A 200 g hockey puck is launched up a metal ramp that is inclined at a 30° angle. The coefficients of static and kinetic friction between the hockey puck and the metal ramp are μ s = 0.40 and μ k = 0.30, respectively. The puck's initial speed is 36 m/s. What vertical height does the puck reach above its starting point? 0.35 m 4) A 200 g hockey puck is launched up a metal ramp that is inclined at a 30° angle. The coefficients of static and kinetic friction between the hockey puck and the metal ramp are μ s = 0.40 and μ k = 0.30, respectively. The puck's initial speed is 14.9 m/s. What speed does it have when it slides back down to its starting point? .34 m/s 5) A 4.00-kg block rests on a 30.0° incline as shown in the figure. If the coefficient of static friction between the block and the incline is 1.70, what magnitude horizontal force F must act on the block to start it moving up the incline? 83.26 N

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