Please answer all the questions. Thank you.

1)

A large air-filled 0.275kg plastic ball is thrown up into the air with an initial speed of 12.3 m/s. At a height of 2.69 rn, the ball's speed is 3.09 m/s. What fraction of its original energy has been lost to air friction? A 20.1kg child is on a swing attached to ropes that are L = 1.47 m long. Take the zero of the gravitational potential energy to be at the position of the child when the ropes are horizontal. a) Determine the child's gravitational potential energy when the child is at the lowest point of the circular trajectory. 289.56J Submit Answer Incorrect. Tries 1/99 Previous Tries b) Determine the child's gravitational potential energy when the ropes make an angle of 45.0 relative to the vertical. 144.78J Submit Answer Incorrect. Tries 2/99 Previous Tries c) Based on the results in part a) and b), which position has the higher potential energy? the position in part b) has greater potential energy the position in part a) has greater potential energy Submit Answer Tries 0/1 An 8.00 k mass moving east at 15.6 m/s on a frictionless horizontal surface collides with a 11.7 kg mass that is initially at rest. After the collision, t e 8.00 kg mass moves south at 2.65 m/s. What is the magnitude of the velocity of the 1.7 kg mass after the collision? 8.85 m/s Submit Answer Incorrect. Tries 2/99 Previous Tries What is the angle relative to the east? 90.0deg Submi' Answer Incorrect. Tries 1/99 M What percentage of the initial kinetic energy is lost in the collision? Do not enter units. An alpha particle (mass = 4 u) has a head-on, elastic collision with a nucleus (mass = 40 u) that is initially at rest. What percentage of the kinetic energy of the alpha particle is transferred to the nucleus in the collision? 18.18 Submit Answer Incorrect. Tries 2/99 Previous Tries Two gliders are moving on a horizontal frictionless air track. Glider 1 has mass m1 = 187.5 g and is moving to the right (positive x-direction) with speed 2.627 m/s. Glider 2 has mass m2 = 282.9 g and is moving to the left (negative x-direction) with a speed of 3.777 m/s. The gliders undergo a totally elastic collision. What is the velocity of glider 1 after the collision? -7i169999m/s Submit Answer Incorrect. Tries 3/99 Previous Tries These are statements regarding the process of measurement. Select all that are True. Taking lots of measurements and averaging them is way of improving the precision of a measurement. Experimental uncertainty is due to three types of experimental error: Random Error, Systematic Error and Human Error. Just by looking at me, you are able to estimate my age to the nearest year. The next nearest estimation by someone else in the class was off by three years. Of precision and accuracy, your estimate has a relatively high accuracy. Systematic error is natural and present to some degree or another in every measurement. Two different pieces of equipment are used to measure the speed of sound under the same conditions. One instrument reads 345.2 m/s and the other reads 333.8 m/s. Of accuracy and precision, at least one of these instruments has poor accuracy. Of the concepts precision and accuracy, the number of significant digits in a measurement is most closely related to accuracy. Submit Answer Incorrect. Tries 22/99 Previous Tries