the last 3 digits of your phone number:___378_____. This isW.

Add 1000W: ___1378______. This isX.

DivideXby 100 without rounding your answer:_______13.78____. This isY.

Add 55 toYand round to the nearest whole number: ______68.78____. This isZ.

1. give an explanation, based on a scientific theory, of why objects fall if they are held up above the ground and then let go. Explain why it is scientific. Then write down a non-scientific explanation of the same phenomenon, and explain why it is non-scientific. Then write down a pseudoscientific explanation of the same phenomenon, and explain why it is pseduoscientific.

2. You need to lift a person with a mass of68.78kilograms who is laying in bed into a wheelchair next to the bed. If the distance from your hand to your elbow is13.78centimeters and the distance between your shoulder and lower back is68.78centimeters, how much force will your lower back muscles experience if you lift by leaning over the wheelchair? Sketch a diagram to help explain your reasoning, and show your calculations.

3. Referring to Question 2 above, how much force will your lower back muscles experience if you lift by sliding the person in a seated position into the wheelchair while you maintain as upright a position as possible? Refer to the diagram from Question 2 above or draw a new one.

4. For each of (a) and (b) below, write a single grammatically correct sentence containing the words indicated that make scientific sense. You may use conjunctions; a list of definitions, however, will not receive credit.

(a) , Kepler, angular, orbit, period.

(b) , gravity, separation, force, third.

6. (a) How much potential energy would be added to an object of mass1378kilograms lifted Z meters into the air? (b) If that object were dropped from that height, how far off the ground would it be moving at68.78meters per second? Or would it not get that fast before it hit the ground? Remember to show your calculations and reasoning.

7. Write a question that computes the parallel and normal forces exerted on an object ofYkilograms sliding down a 30-degree inclined plane with a coefficient of friction of 0.3. Draw a sketch of the system in the question, labeling the key quantities.

8. Three children are playing on a skating rink. Allie slides eastward and runs into Billie and imparts a force ofZnewtons. Callie slides northward also runs into Billie and imparts a force ofYnewtons. Billie's mass isYkilograms. Draw a diagram of this system, labeling any vectors or quantities that are significant; then calculate Billie's velocity one second after the collisions.