In an attempt to determine the velocity of a person on a bicycle, an observer us

Question

In an attempt to determine the velocity of a person on a bicycle, an observer uses a stopwatch and times the length of time it takes to cover 25 "squares" on a sidewalk. A measurement of one of the squares shows it to be 1.13 long. The bicycle takes 4.82 seconds to travel this far. What velocity, in m/sec, should the observer report? Convert the value 38.4 ppm into ppb A rock is placed on a balance and its mass is determined to be 22.410 g. When the rock is then placed in a graduated cylinder that originally contains 11.34 mL of water the new volume is 17.82 mL. What should the density of the rock be reported as? Assuming the numbers given are measurements, carry out the indicated arithmetic operations and give the answer with the correct number of significant figures. 7.132/6 3.65 times 10^2 + 8.1 times 10^3 18.13 - 1.3 (9 times 10^-6) times (1.33 times 10^-3) Express each of the following temperatures in degree C (ignore decimals). 177 K 298 K. 4 K. 1500 K. Indicate, on the Response Sheet, whether the statement is true (mark, A) or false (mark, B). Avogadro's Law states that the volume of a gas is inversely proportional to the number of molecules (or moles) of gas present. True False

Explanation / Answer

1. Velocity = Distance / Time

Distance = Number of cubes * Length of 1 cube

= 25 * 1.13

= 28.25 m

Time = 4.82 s

Therefore, Velocity = 28.25 m / 4.82 s

= 5.86 m/s

(There is no need to multiply the time by 25. The total time taken is 4.82 seconds.)

4. a) 7.132 / 6 = 1.1886

But, the number of significant figures is 1 because the number 6 has one significant figure. The number of significant figures depends on the LEAST precise value in the question.

Therefore, 1.1886 is rounded off to 1.

Hence, the final answer is 1

b) 3.65 x 102 + 8.1 x 103 = 8465

But, the number of significant digits is 2, which is got from the number 8.1 in the question.

Therefore 8465 is rounded off to 8500

c) 18.13 - 1.3 =16.83

But, the number of significant digits is 2.

Therefore, 16.83 is rounded off to 16.8

d) (9 x 10-6) x (1.33 x 10-3) = 1.197 x 10-8

But, the significant number of digits is 1, which is got from the number 9.

Therefore 1.197 x 10-8 is rounded off to 1 x 10-8

Related Questions

Navigate

• Browse (All)
• Browse I
• Subjects

---

---

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