In a game of shuffleboard (played on a horizontal surface), a puck is given an initial speed of 6.0 m/s. It slides a distance of 9.0 m before coming to rest. What is the coefficient of kinetic friction between the puck and the surface?
a. 0.20
b. 0.18
c. 0.15
d. 0.13
e. 0.27
a
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Light from a HeNe laser (632.8 nm wavelength) is directed upon a human hair, in an attempt to measure its diameter by examining the diffraction pattern. The hair is mounted in a frame 7.5m from a wall and the central diffraction maximum is measured to be 14.6 cm wide. What is the diameter of the hair?
A. 65 microns B. 32.5 microns C. 43.3 microns D. 86.6 microns
Determine the difference equations applicable to the centerline and at the surface of an axisymmetric cylindrical geometry with volumetric heat generation and convection boundary condition. Assume steady-state conditions.
GIVEN
Axisymmetric, steady, cylindrical geometry with volumetric heat generation and surface
convection boundary condition
FIND
(a) Difference equations for the centerline and surface
SKETCH
How does terrestrial radiation warm Earth's surface?
What will be an ideal response?
In Ptolemy's theory,
A) the planets move in circles-within-circles around the sun. B) the planets move in elliptical orbits around the sun. C) the planets move in circles around Earth. D) the planets move in circles around the sun. E) the planets move in circles-within-circles ["loop-the -loops"] around Earth.