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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

Assume that an intercontinental ballistic missile goes from rest to a suborbital speed of 6.50 km/s in 60.0 s (the actual speed and time are classified). What is its average acceleration in m/s2 and in multiples of g (\({\bf{9}}{\bf{.80}}\;{\bf{m/}}{{\bf{s}}^{\bf{2}}}\))?

Is it possible for speed to be constant while acceleration is not zero? Give an example of such a situation.

A swimmer bounces straight up from a diving board and falls feet first into a pool. She starts with a velocity of 4.00 m/s, and her take-off point is above the pool. (a) How long are her feet in the air? (b) What is her highest point above the board? (c) What is her velocity when her feet hit the water?

A bullet in a gun is accelerated from the firing chamber to the end of the barrel at an average rate of\({\bf{6}}{\bf{.20 \times 1}}{{\bf{0}}^{\bf{5}}}\;{\bf{m/}}{{\bf{s}}^{\bf{2}}}\)for\({\bf{8}}{\bf{.10 \times 1}}{{\bf{0}}^{{\bf{ - 4}}}}\;{\bf{s}}\). What is its muzzle velocity (that is, its final velocity)?

Conversations with astronauts on the lunar surface were characterized by a kind of echo in which the earthbound person’s voice was so loud in the astronaut’s space helmet that it was picked up by the astronaut’s microphone and transmitted back to Earth. It is reasonable to assume that the echo time equals the time necessary for the radio wave to travel from the Earth to the Moon and back (that is, neglecting any time delays in the electronic equipment). Calculate the distance from Earth to the Moon given that the echo time was 2.56 s and that radio waves travel at the speed of light ( 3 x 108m/s ).
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