When it is 145 m above the ground, a rocket traveling vertical by upward at a constant 8.50 m/s relative to the ground launches a secondary rocket at a speed of 12.0 m/s at an angle of 53.0° above the horizontal, both quantities being measured by an astronaut sitting in the rocket. After it is launched the secondary rocket is in free-fall. (a) Just as the secondary rocket is launched, what are the horizontal and vertical components of its velocity relative to (i) the astronaut sitting in the rocket and (ii) Mission Control on the ground? (b) Find the initial speed and launch angle of the secondary rocket as measured by Mission Control. (c) What maximum height above the ground does the secondary rocket reach?
Neuromotor Control 2-1 Degrees of Freedom Problem – By Nikolai Bernstein stating the infamous number of ways our bodies can do things, even the simple tasks such as touching your nose Synergy – Reduces the problem of degrees of freedom Example: If you were asked to draw 5 circles with 1 inch diameter on a piece of paper there are infamous ways you could do that. If you were then told to draw 5 circles with 1 inch diameter on a piece of paper but this time having each circle only 4 inches apart you become restricted in the amount of ways you are able to accomplish the task. The second task is an example of synergy. Real Life Examples: 1) Mechanics (physical constraints) 2) Efficiency (using the most efficient motion minimizing energy expenditure Degrees of Freedom Problem is not really a “problem” when doing a task, it is a problem that helps us explain how it is done Timing and Sequencing Problem – Many actions require behaviors to occur in a specific timing and order (speech, typing, walking) How do we plan for a sequence of actions Coarticulation – Simultaneous motions that occur in sequential tasks (anticipatory behaviors) Examples: When you are asked to say the word “tulip” your lips make the shape for “u” sound before even saying “t” When you are typing you move your fingers before even pushing the first letter Metronome experiment told people to tap their toes at the same time they hear the sound go off. This study found that people