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Chapter 1: Q19P (page 39)
What is the unit vector in the direction of ?What is the unit vector in the direction of?
The unit vector in the direction of
The unit vector in the direction of
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Figure 1.60 shows the trajectory of a ball travelling through the air, affected by both gravity and air resistance.
Here are the positions of the ball at several successive times.
Location | t(s) | Position ( m) |
A | 0.0 | (0,0,0) |
B | 1.0 | (22.3,26.1,0) |
C | 2.0 | (40.1,38.1,0) |
a) What is the average velocity of the ball as it travels between location A and location B? b) If the ball continued to travel at the same average velocity during the next second, where would it be at the end of that second? (That is, where would it be at time t=2s )c) How does your prediction from part b) compare to the actual position of the ball at t=2s(location C)? If the predicted and the observed location of the ball are different, explain why?
Question: Moving objects left the traces labeled A-F in Figure 1.54. The dots were deposited at equal time intervals (for example, one dot each second). In each case the object starts from the square. Which trajectories show evidence that the moving object was interacting with another object somewhere? If there is evidence of an interaction, what is the evidence?
A proton is located at . An electron is located at . What is the vector pointing from the electron to the proton? What is the vector pointing from the proton to the electron?
On a piece of graph paper, draw arrows representing the following vectors. Make sure the tip and tail of each arrow you draw are clearly distinguishable. (a) Placing the tail of the vector at , draw an arrow representing the vector Label it . (b) Placing the tail of the vector at , draw an arrow representing the vector . Label it .
A spaceship far from all other objects uses its thrusters to attain a speed of m/s. The crew then shuts off the power. According to Newton's first law, what will happen to the motion of the spaceship from then on?
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