Chapter 1: Q5. (page 17)
You measure the radius of a wheel to be 4.16 cm. If you multiply it by 2 to get the diameter, should you write the result as 8 cm or as 8.32 cm? Justify your answer.
Short Answer
The diameter of the wheel is 8.32 cm.
Chapter 1: Q5. (page 17)
You measure the radius of a wheel to be 4.16 cm. If you multiply it by 2 to get the diameter, should you write the result as 8 cm or as 8.32 cm? Justify your answer.
The diameter of the wheel is 8.32 cm.
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Get started for freerepresents the dimensions for which of the following?
(a) cm2
(b) square feet
(c) m2
(d) All the above
Recent findings in astrophysics suggest that the observable universe can be modeled as a sphere of radiuswith an average total mass density of about. Only about 4% of total mass is due to “ordinary” matter (such as protons, neutrons, and electrons). Estimate how much ordinary matter (in kg) there is in the observable universe. (For the light- year, see the Problem19.)
Global positioning satellites (GPS) can be used to determine your position with great accuracy. If one of the satellites is 20,000 km from you, and you want to know your position to, what percent uncertainty in the distance is required? How many significant figures are needed in the distance?
Four students use different instruments to measure the length of the same pen. Which measurement implies the greatest precision?
(a) 160.0 mm
(b) 16.0 cm
(c) 0.160 m
(d) 0.00016 km
(e) Need more information
Estimate the number of jelly beans in the jar of Fig. 1–18.
FIGURE 1-18 Problem 45. Estimate the number of jelly beans in the jar.
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