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Chapter 2: Q19CQ (page 79)

What is the last thing you should do when solving a problem? Explain.

Short Answer

Expert verified

After solving the problem, the last thing to do is to check that the answer matches the real-life situation.

Step by step solution

01

Consider whether the answer is feasible in the actual world

Examine the solution to see whether it is reasonable: Does this make sense to you. Because the goal of physics is to describe nature accurately, the last step is crucial.

Check the answer's magnitude and sign, and the units, to see if it's realistic.

As you solve many physics problems, your reasoning will develop, and you will be capable of making extremely good judgments about whether a solution accurately depicts nature.

02

Is the Answer sensible? Check

The problem is reintroduced to its fundamental conceptual meaning at this level.

If you can assess whether the answer is reasonable, you have a deeper understanding of physics than simply being able to solve a problem mechanically.

These are the few steps that should be followed while solving numerical problems.

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Most popular questions from this chapter

A football quarterback runs 15.0 m straight down the playing field in 2.50 s. He is then hit and pushed 3.00 m straight backward in 1.75 s. He breaks the tackle and runs straight forward another 21.0 m in 5.20 s. Calculate his average velocity (a) for each of the three intervals and (b) for the entire motion.

A student drove to the university from her home and noted that the odometer reading of her car increased by 12km . The trip took 18min.

(a) What was her average speed?

(b) If the straight-line distance from her home to the university is10.3km in a direction25.0潞 south of east, what was her average velocity?

(c) If she returned home by the same path7h30min after she left, what were her average speed and velocity for the entire trip?

If a subway train is moving to the left (has a negative velocity) and then comes to a stop, what is the direction of its acceleration? Is the acceleration positive or negative?

Blood is accelerated from rest to 30.0 cm/s in a distance of 1.80 cm by the left ventricle of the heart. (a) Make a sketch of the situation. (b) List the knowns in this problem. (c) How long does the acceleration take? To solve this part, first identify the unknown, and then discuss how you chose the appropriate equation to solve for it. After choosing the equation, show your steps in solving for the unknown, checking your units. (d) Is the answer reasonable when compared with the time for a heartbeat?

In a slap shot, a hockey player accelerates the puck from a velocity of 8.00 m/s to 40.0 m/s in the same direction. If this shot takes\({\bf{3}}{\bf{.33 \times 1}}{{\bf{0}}^{{\bf{ - 2}}}}\;{\bf{s}}\), calculate the distance over which the puck accelerates.
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