Structured Problem Solving A major difficulty that students will often encounter
ID: 1407827 • Letter: S
Question
Structured Problem Solving A major difficulty that students will often encounter is an inability to approach a problem in a systematic manner. The following procedural method is intended to guide you through solving any physics problem. My further hope is that through using this process you will realize that any problem in life, no matter how difficult is appears to be, can be addressed by breaking it down into steps. Key idea: Write down a short statement of the physical principle which you think is the most relevant to solving the problem. Describe the elements of the problem which indicated that this physical principle might be applicable. Stock of Data: Make a list of the numerical data you are given in the problem description. Be sure to include units. List quantities you are asked to calculate with trailing question marks. This step may include a diagram indicating your understanding of the problem. D. Equation: Choose an equation which reflects both the key idea of your problem and information from your stock of data. You may need more than one equation. Solve: If the equation or equations you have chosen are not already solved for you unknown then do the algebra to accomplish this now. Be sure to show enough detail in each step so that a reader can follow your work. Substitute in Numerical Data: Once you have an analytic solution, substitute numerical values into the analytic solution to obtain the final answer. Sanity Check: Answer the question. "Does this answer make sense in light of the rest of the knowledge I possess?" The sanity check could include a back of the envelope calculation done with a single significant digit or a unit analysis of the final answer. L 'TU'n "v time base of the table aoes 6. You hit a tennis ball from just above the ground. It leaves the racket at 20 m/s going 150 upward. (a) Show that the ball lands before reaching the baseline at the other end of the court, 25 m away. (b) If you struck the ball harder but at the same angle have and still land in what's the maximum initial speed it could the court A crane lifts a 185-kg steel beam applying a 1960-N vertical force. Find (a) the net force on the beam and (b) the beam's ac leratioExplanation / Answer
In question 1 you need to tell me how the angle is measured otherwise it will give different answers depending on how angle is measured
2)
a)
On steel beam: 1960 N acts upward and a force m*g acts downward due to gravity.
So, net force on the beam = 1960 - m*g
= 1960 - 185*9.8
= 147 N in upward direction
b)
acceleration of beam = net force /mass
= 147 / 185
=0.79 m/s^2 upward