Graphical Analysis: Which of the following graphs represent an object having zero acceleration?
A. only graph a
B. only graph b
C. graphs a and b
D. graphs b and c
E. graphs c and d
Answer: C
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A solar eclipse can only happen during a:
A) new moon. B) solstice. C) first quarter moon. D) full moon. E) perihelion passage of the Sun.
Ninety percent of light incident on a certain piece of glass passes through it. How much light passes through two pieces of this glass?
A) 80% B) 81% C) 85% D) 89% E) 90%
At room temperature (20.°C) the area of a hole in a sheet of material is 5.505 cm2. When heated to 830.°C the area increases by 29.0 mm2
(a) What is the thermal coefficient of linear expansion for the material? (b) If the temperature had decreased to -76.° Fahrenheit, what would be the area of the hole?
A long wire is known to have a radius greater than 4.0 mm and to carry a current uniformly distributed over its cross section. If the magnitude of the magnetic field is 0.285 mT at a point 4.0 mm from the axis of the wire and 0.200 mT at a point 10 mm from the axis, what is the radius of the wire?
a. 4.6 mm b. 7.1 mm c. 5.3 mm d. 12 mm e. 10 mm