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Homework1-help

# Homework1-help - Homework 1(Chapt 1 2 Q1.6 The particle...

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Homework 1(Chapt. 1 & 2) Q1.6 The particle position is to the left of zero on the x -axis, so its position is negative. The particle is moving to the right, so its velocity is positive. The particle’s speed is increasing as it moves to the right, so its acceleration is positive. 1.46. Solve: A skier starts from rest down a 25 ° slope with very little friction. At the bottom of the 100 m slope the skier moves to a flat area and continues at constant velocity. 1.26. Solve: (a) We need kg/m 3 . There are 100 cm in 1 m. If we multiply by 3 3 100 cm (1) 1 m = we do not change the size of the quantity, but only the number in terms of the new unit. Thus, the mass density of aluminum is 3 3 3 3 3 kg 100 cm kg 2.7 10 2.7 10 cm 1 m m -  × = ×   (b) Likewise, the mass density of alcohol is 3 3 3 g 100 cm 1 kg kg 0.81 810 cm 1 m 1000 g m  =     2.4. (a) At t = 1 s, the slope of the line for object A is greater than that for object B. Therefore, object A’s speed is greater.

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Homework1-help - Homework 1(Chapt 1 2 Q1.6 The particle...

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