There are other ways of expressing uncertainty besides significant figures. For example, suppose a quantity is known to have a value between 20.4 and 20.0, and our best estimate of the value is midrange at 20.2 . We could write the number as 20.2 +/? 0.2 and say that the number has a 1% uncertainty. We would also say it has 3 significant figures. If we square a number with 1% uncertainty (i.e.,
2 parts in about 200) and 3 significant figures, what results?
a. A number with 1% uncertainty and 3 significant figures.
b. A number with 2% uncertainty and 3 significant figures.
c. A number with 2% uncertainty and 2 significant figures.
d. A number with 1% uncertainty and 2 significant figures.
b
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Compound Microscope: A microscope has an objective lens of focal length 1.40 mm and an eyepiece of focal length 20.00 mm. It is adjusted for minimum eyestrain for persons with a near point of 25.0 cm. A blood sample is placed 1.50 mm from the objective. The magnitude of the overall magnification is closest to
A. 18. B. 37. C. 180. D. 370.
A 5.00-kg box slides 4.00 m across the floor before coming to rest. What is the coefficient of kinetic friction between the floor and the box if the box had an initial speed of 3.00 m/s?
A) 1.13 B) 0.587 C) 0.115 D) 0.229 E) 0.267
If a charged particle is moving in a uniform magnetic field, its path can be
a. a straight line. b. a circle. c. a helix. d. any of the above.
An object moves with constant speed through a fluid. For a fixed geometry and fluid density, if the viscosity of the fluid increases then the speed at which flow becomes turbulent
A) increases. B) remains the same. C) decreases. D) could increase or decrease depending on the shape of the object. E) could increase or decrease depending on the value of the fluid density.