quiz-S08 - Quiz 1 This is a photograph of an apple and...

Info iconThis preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon
Quiz 1 This is a photograph of an apple and feather free fall in a evacuated chamber. The apple and feather are released from the top. Suppose the camera opened flash every 1 s. (1) Suppose A1 is the distance from t = 0s to t = 1 s, A2 is the distance from t = 1s to t =2s, A3 is the distance from t = 2s to t = 3s …… what is the ratio of A1: A2: A3……. (2) If camera opened flash every 0.06s, is the ratio of the distance between every 0.06 s the same as above or change? Why?
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Answer: The ratio is 1:3:5 :7……(2n -1), here n = 1, 2, 3, Show it in general case, suppose the time interval is t The distance from 0 –one t, A1 = ½*g*( t) 2 (notice here I consider the distance, so I neglect (-) sign) The distance from t---2 t, A2 = ½*g*(2 t) 2 -½*g*( t) 2 = ½*g*( t) 2 (2 2 -1) Using the same way the distance from 2 t---3 t, A3 = ½*g*( t) 2 (3 2 -2 2 ) A4 = ½*g*( t) 2 (4 2 -3 2 ) ……. An = ½*g*( t) 2 (n 2 – (n-1) 2 ) = ½*g*( t) 2 (n 2 –n 2 +2n-1) = ½*g*( t) 2 (2n-1) Therefore the ratio should be 1:3:5…….(2n-1), the ratio is independent of t
Background image of page 2
Quiz question 2. A 200 kg horse is hooked up to a 400 kg wagon. you signal the horse to pull forward (see (a) )The horse turns to you and says, “Why bother? However hard I pull, the wagon is just going to exert an equal but opposite force. The wagon won’t move.” Will the wagon move? Explain. You can use the Free-body diagram (b) and ( c) as kind of explanation you give the horse to convince him to pull
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Hi, horse, you are wrong! The wagon will move if
Background image of page 4
Image of page 5
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

Page1 / 14

quiz-S08 - Quiz 1 This is a photograph of an apple and...

This preview shows document pages 1 - 5. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online