PHYSICS 160

There is a homework assignment due (almost) every class period!
If on paper, they should be turned in at the alphabetically-labelled box at the front of the classroom,        before class begins!

If on WebAssign, they are due at or before 1 AM of the night after class!
Note that due dates are given in Spanish, with English translations the first time a new word appears (only).

No. I: due on viernes (Friday), 18 de enero (January)

1. Please convert the common speed 60 miles per hour to the following other units:
   1. feet per second,
   2. kilometers per hour,
2. Chapter 1: Problem 12E
3. Chapter 1: Problem 20P
4. Chapter 2: Question 2

No. II: due on miercoles (Wednesday), 23 de enero

1. Paper problems, to turn in at the beginning of class:
   1. Chapter 2: Problem 10E
   2. Chapter 2: Question 6
   3. Chapter 2: Problem 16E
2. The very first WebAssign assignment is due tonight! It consists of only two problems. Actually "tonight" means 1 AM, very early Thursday morning, but I would start sooner!

No. III: due on viernes, 25 de enero

1. Paper problems below are due at the beginning of class, on Friday.
   1. Chapter 2: Problem 32E
   2. Chapter 2: Problem 42E
2. There are 3 WebAssign problems to be done, due late Friday night, as usual [1 AM, Saturday morning].

No. IV: due on lunes (Monday), 28 de enero

1. Paper problems below are due at the beginning of class, on Monday.
   1. Chapter 2: Problem 45E
   2. Chapter 2: Problem 57P
   3. Chapter 3: Problem 13E
2. There are 4 simple WebAssign problems to be done, due late Monday night, as usual.

No. V: due on miercoles, 30 de enero

1. Here are two paper problems to be handed in on Wednesday morning.
   1. An orange is thrown upward into the air by a student standing near the (top) edge of a cliff. It rises for 2 seconds, and then falls to the bottom of the cliff, which is 100 meters below the student's hand.
      1. How high did it rise, measured from the student's hand?
      2. What was its velocity as it passed the student on the way down?
      3. What was its velocity just before it hit the ground at the bottom of the cliff?
      4. Please draw 3 simple, clear graphs, versus time [on the horizontal axis], of the height, velocity, and acceleration of the orange.
         Please take the upward direction as positive.
   2. Chapter 4: Question 8
2. WebAssign Session: a problem from Chapter 3 and one from Chapter 4.

No. VI: due on viernes, 1 de febrero (February)

1. Here are two paper problems to be handed in on Friday morning.
   1. You are helping a friend devise some challenging tricks for the upcoming Twin Cities Freestyle Skateboard Competition. To plan a series of moves, your friend needs to know the rate that the skateboard, with him on board, slows down as it coasts up the competition ramp, which is 30° to the horizontal. You assume that his rate is constant, and decide to have him conduct an experiment, from which you can determine the information he needs. When he is travelling as fast as possible on his competition skateboard, he stops pushing and coasts up the competition ramp. You measure that he typically goes about 95 feet in 6 seconds. Your friend weighs 170 lbs wearing all of his safety gear and the skateboard weighs 6 lbs. What is the value that you give him, for his planning?
   2. Chapter 4: Questions 3 and 4 [very simple questions]
2. WebAssign Session: a problem from Chapter 3 and 2 brief ones from Chapter 4.

No. VII: due on lunes, 4 de febrero

1. Here is a single paper problem to be handed in on Monday morning.
   1. A sprinter runs at 9.2 m/s around a circular track with a centripetal acceleration of 3.8 m/s².
      1. What is the track radius?
      2. What is the period of the motion?
2. There are 4 problems due on WebAssign; they all concern 2-dimensional projectile motion, under the influence of the usual constant gravitational acceleration,as discussed in Chapter 4.

No. VIII: due on miercoles, 6 de febrero

1. There are NO paper problems due today.
2. There are 4 problems on WebAssign due tonight.
   They concern both relative and circular motion, two unrelated topics, but both near the end of Chapter 4.
   For problems involving very high speeds, one must use the extra handout given in class, concerning relative motion at very high speeds.

No. IX: due on viernes, 8 de febrero

1. There are two paper problems due today:
   1. Chapter 4: Do Problem 46P. Please, ALSO make a good sketch, showing the two locations discussed and the velocity vectors and acceleration vectors as measured at those two locations.
   2. Chapter 4: Problem 54E.
2. There are two WebAssign problems, due tonight. One on circular motion and one on (very high-speed)relative motion.

No. X: due on lunes, 11 de febrero

1. There are two paper problems due today:
   1. Chapter 5: Questions 4 and 7.
      In your answers to both questions, be sure and give clear explanations (in English sentences) as to why your responses are the correct ones!
2. There are 2 questions and 2 simple problems on WebAssign due tonight. On the second question, you need not give the explanation which is requested.

No. XI: due on miercoles, 13 de febrero

1. There are NO paper problems due today:
2. There are 2 questions, involving Newton's Third Law, on WebAssign due tonight.

FIRST EXAM will be on Friday, 15 February

Coverage will be the first 4 chapters of the text.

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