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- How long will it take a shell fired from a cliff at an initial horizontal velocity of 800 m/s to reach the ground 119 m below?Calculate the speed (in m/s) a spherical rain drop would achieve falling from 2.50 km in the absence of air drag and with air drag. Take the size across of the drop to be 3 mm, the density to be 1.00 ✕ 103 kg/m3, and the surface area to be πr2. (Assume the density of air is 1.21 kg/m3.) (a) in the absence of air drag = ? m/s (b) with air drag = ? m/sThe baseball in the figure below travels through the air. V PAK (a) At what point(s) on its trajectory is the acceleration zero? O At the highest point on its trajectory. O Immediately before contact with the ground. O At the lowest point on its trajectory. O Immediately after contact with the bat. O The acceleration is never zero. (b) At what point(s) on its trajectory is the vertical component of the velocity zero? O Immediately before contact with the ground. O Immediately after contact with the bat O At the highest point on its trajectory. O The vertical component of velocity is never zero. O At the lowest point on its trajectory. (c) At what point(s) on its trajectory is the force on the ball zero? O At the lowest point on its trajectory. O Immediately before contact with the ground. O Immediately after contact with the bat. O At the highest point on its trajectory. O The force is never zero. (d) At what point(s) on its trajectory is the speed zero? O At the highest point on its…
- A woman bails out of an airplane at an altitude of 11,000 ft, falls freely for 19 s, then opens her parachute. How long will it take her to reach the ground? Assume linear air resistance v ft /s, taking p= 0.16 without the parachute and p= 1.6 with the parachute. (Suggestion: First determine her height above the ground and velocity when the parachute opens.) ... It will take her seconds to reach the ground. (Round to the nearest whole number as needed.)A boy tosses a ball into the air so it follows the 2-D parabolic curve in x and y as shown in the drawing. Using this figure, identify at which of the points the ball's velocity is zero. Ľ B с VoA ball is launched horizontally from a cliff with an initial velocity of u m s-'. After two seconds, the ball's velocity is in the direction 45° from the horizontal. What is the magnitude of the velocity in m s¯' at two seconds? (А) и (В) 1.5 u (C) 19.6 (D) 27.7
- Without air resistance, the time for a vertically tossed ball to return to where it was thrown is more than the time going upward. O less than the time going upward. O the same as the time going upward. O 9.81 m/s for every second in the air.Show, using graphical vector addition, that the acceleration vector for an object in uniform circular motion points toward the center of the circular path. Use the factthat acceleration in two or more dimensions is defined asA skateboarder rolls upward along a curved ramp, as shown in the diagram, and reaches the highest point thatis a vertical height of 7.5 m above the base of the ramp. (a) What would the initial speed at the base of the ramp (point A) required for the skateboarder to reachthe top of the ramp be? (b) What is the skateboarder’s speed at the point that is 1.1 m vertically above the base of the ramp?
- Because we are on the surface of the Earth and the Earth is rotating, we expe- rience a centripetal acceleration towards the axis about which we rotate. (a) What is the acceleration that you would feel from the circular motion due to the rotation of the Earth if you were at the equator? Feel free to look up the radius of the Earth.A boy tosses a ball into the air so it follows the 2-D parabolic curve in x and y as shown in the drawing. Using this figure, identify at which of the points the ball's vertical velocity component is zero. Ľ B Vor|A bell S tesnel off of Gn sQ m bgh building. The 9nefeal velocity s 20m ata lanch angle of 53 degrees. ewhere ull the boll land? Pcehat volacitr dees the ball het the grand with? Howlang well lexe unkl 24 kils Hhe greund? owhat s the marXam cm heght Hat te kall reaches?