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Professor Lewin has a bowling ball (m = 7.0 kg) attached to the end of a 4.0 m long cord. The other end is affixed to the ceiling, allowing the ball to swing freely at the end of the cord. He pulls back the bowling ball so that the cord makes an angle of 60° with the vertical and drops the ball from rest. How fast is the ball going when the cord is vertical, at the bottom of the arc? Ignore air resistance and friction.

A 1 kg particle is moving at a constant speed of 10 m/s around a circle. The circle has a radius of 10 m. The net work done on the particle during one loop around the circle is (remember, circumference = 2πr)

In the blank spaces below, write the output produced by each line of the following program, as it would appear on the console. def claim(hear, good, song): print(hear, “plus”, song, “is greater than”, good) return hear + song def main(): hear = 4 song = 5 good = 12 walk = 90 talk = 19 feel = 23 good = claim(feel, song, feel) again = claim(good, hear, song) claim(talk, 14, feel) talk = claim(talk, again, walk) main() Line 1: [l1] Line 2: [l2] Line 3: [l3] Line 4: [l4]

In the blank spaces below, write the output produced by each line of the following program, as it would appear on the console. def double_up(ten, two, twenty): ten = ten // 2 print(two, “is half of”, twenty, “plus”, ten); return ten + two def main(): ten = 40 fourty = 30 thirty = 20 fifty = 10 twenty = 50 sixty = double_up(fifty, ten, thirty) fifty = double_up(twenty, 70, sixty) double_up(ten, fourty, fifty) fifty = 10 ten += double_up(sixty, sixty * 2, ten) double_up(fifty, 20, ten) main() Line 1: [l1] Line 2: [l2] Line 3: [l3] Line 4: [l4] Line 5: [l5]

In the blank spaces below, write the output produced by each line of the following program, as it would appear on the console. def equation(one, four, two): two = two + “two” print(four, “is half of”, two, “plus”, one) return two + “two” def main(): one = “four” two = “two” three = “one” four = “mouse” ten = “cat” five = equation(one, two, three) one = equation(one, “rabbit”, three) equation(one, four, five) ten += equation(five + “++”, four, five) equation(ten, “kitten”, four) main() Line 1: [l1] Line 2: [l2] Line 3: [l3] Line 4: [l4] Line 5: [l5]

In the blank spaces below, write the output produced by each line of the following program, as it would appear on the console. def claim(hear, good, song): print(hear, “plus”, song, “is greater than”, good) return hear + song def main(): hear = 4 song = 5 good = 12 walk = 90 talk = 19 feel = 23 good = claim(feel, song, feel) again = claim(good, hear, song) claim(talk, 14, feel) talk = claim(talk, again, walk) main() Line 1: [l1] Line 2: [l2] Line 3: [l3] Line 4: [l4]

In the blank spaces below, write the output produced by each line of the following program, as it would appear on the console. def double_up(ten, two, twenty): ten = ten // 2 print(two, “is half of”, twenty, “plus”, ten); return ten + two def main(): ten = 40 fourty = 30 thirty = 20 fifty = 10 twenty = 50 sixty = double_up(fifty, ten, thirty) fifty = double_up(twenty, 70, sixty) double_up(ten, fourty, fifty) fifty = 10 ten += double_up(sixty, sixty * 2, ten) double_up(fifty, 20, ten) main() Line 1: [l1] Line 2: [l2] Line 3: [l3] Line 4: [l4] Line 5: [l5]

Complete the sentence with your own words. Being unable to finish her dinner,

Complete the sentence with your own words. Having been fired from his last job,

The four main categories of economic resources are