Chapter 2: Problem 18
Describe What is the main difference between velocity and speed?
Short Answer
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Key Concepts
These are the key concepts you need to understand to accurately answer the question.
Chapter 2: Problem 18
Describe What is the main difference between velocity and speed?
These are the key concepts you need to understand to accurately answer the question.
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Get started for freeTwo football players move in a straight line directly toward one another. Their equations of motion are as follows: $$ \begin{aligned} &x_{1}=0.1 \mathrm{~m}+(-3.1 \mathrm{~m} / \mathrm{s}) t \\ &x_{2}=-6.3 \mathrm{~m}+(2.8 \mathrm{~m} / \mathrm{s}) t \end{aligned} $$ (a) Which player is moving faster? (b) At what time do the players collide?
Challenge A finch rides on the back of a Galapagos tortoise, which walks at the stately pace of \(0.060 \mathrm{~m} / \mathrm{s}\). After \(1.2\) minutes the finch tires of the tortoise's slow pace, and it takes flight, traveling in the same direction for another \(1.2\) minutes at \(13 \mathrm{~m} / \mathrm{s}\). What was the average speed of the finch over the entire \(2.4\)-minute interval?
Think \& Calculate You drive in a straight line at \(20.0 \mathrm{~m} / \mathrm{s}\) for \(10.0 \mathrm{~min}\), then at \(30.0 \mathrm{~m} / \mathrm{s}\) for another \(10.0 \mathrm{~min}\). (a) Is your average speed \(25.0 \mathrm{~m} / \mathrm{s}\), more than \(25.0 \mathrm{~m} / \mathrm{s}\), or less than \(25.0 \mathrm{~m} / \mathrm{s}\) ? Explain. (b) Verify your answer to part (a) by calculating the average speed.
What is the final position of an object that starts at \(7.3 \mathrm{~m}\) and moves with a velocity of \(-1.1 \mathrm{~m} / \mathrm{s}\) for \(3.5 \mathrm{~s}\) ?
Triple Choice Suppose you ride a bicycle around the block, returning to your starting point. At the end of your trip, is your average speed greater than, less than, or equal to the magnitude of your average velocity? Explain.
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