2. (20 points) The following parts ask for specific numbers in the answers. However, it is...
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2. (20 points) The following parts ask for specific numbers in the answers. However, it is much better to write down what you are doing using symbols for mass, acceleration, force, etc., and then plug in the numbers. Round things off to keep it simple, since you don't have a calculator. If your thinking is clear, you will get partial credit for correct ideas, even if the final number is not correct. (Use 10 m/s² for the acceleration of gravity.) A. You have a book that has a mass of 0.5 kg. You hold it out at shoulder height and drop it from rest. What is its speed after half a second? Identify any assumptions you make. B. What distance did it fall in that time? C. What if the speed of the book when it hits the floor is v=6 m/s. Assume that the time of collision with the floor was only one twentieth of a second before coming to rest. What was the average force acting on the book during this time interval? 2. (20 points) The following parts ask for specific numbers in the answers. However, it is much better to write down what you are doing using symbols for mass, acceleration, force, etc., and then plug in the numbers. Round things off to keep it simple, since you don't have a calculator. If your thinking is clear, you will get partial credit for correct ideas, even if the final number is not correct. (Use 10 m/s² for the acceleration of gravity.) A. You have a book that has a mass of 0.5 kg. You hold it out at shoulder height and drop it from rest. What is its speed after half a second? Identify any assumptions you make. B. What distance did it fall in that time? C. What if the speed of the book when it hits the floor is v=6 m/s. Assume that the time of collision with the floor was only one twentieth of a second before coming to rest. What was the average force acting on the book during this time interval?
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