Explain how to do the following problems step-by-step. 1) It takes 93 seconds on

Question

Explain how to do the following problems step-by-step.

1) It takes 93 seconds on average for you to swim a 50-m length pool. Swimming laps (i.g. down the 50-m pool and back), where would you expect to be after 110 seconds?

2) Two people measure the length of a cell phone a large number of times. Your friend gets a best estimate of 77.98±0.05mm. Your best estimate is 77.90±0.07mm. Are they the same within uncertainty?

3) In Einstein's famous equation E=mc2, m is mass and c is the speed of light. What are the units of E, both in base units and in one derived unit?

Explanation / Answer

Answer 1) In 93 sec, length of swimming pool covered is 50 m.

So, in 110 sec, length of swimming pool covered is (50 x 110)/93 m = 59.14 m.

So, after 110 sec, the swimmer is expected to be 9.14 m away from the opposite end of the pool or (50 - 9.14)m = 40.86 away from the starting point.

Related Questions

Navigate

• Browse (All)
• Browse E
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.