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The crate slides down the section of the spiral ramp such that r = (0.5z) ft and z = (100 - 0.1t2) ft, where t is in seconds. If the rate of rotation about the z axis is ? = 0.04pt rad/s, determine the magnitudes of the velocity and acceleration of the crate at the instant z = 10 ft.
a steam power plant implements an ideal reheat rankine cycle. steam enters the inlet of the high-pressure turbine at 8
an automobile traveling at 30 miles per hour on level pavement with a coefficient of kinetic friction of 0.6. weighs
a 600 mw coal-fired power plant has an overall thermal efficiency of 38. it is burning coal that has a heating value of
the sun is approximated as a spherical black body with a surface temperature of 5762 k. the irradiation from the sun as
Weld analysis, Two steel plates are joined with a butt weld using a weld throat h of 3/8 in. and the length of weld 1 of 4in.
to determine the specific volume v and specific internal energy u for some solids and liquids is it more important that
a heat engine is operating on a carnot cycle and has a thermal efficiency of 55. the waste heat from this engine is
How many times more ignition energy is required to achieve ignition of a fuel-air mixture at sea level with T = 298 K than at altitude of 6000 m where pressure P = 47,166 Pa and T = 248 K?
a car moves along an x axis through a distance of 990 m starting at rest at x 0 and ending at rest at x 990 m.
on an assembly line that fills 8-ounce cans a can will be rejected if its weight is less than 7.90 ounces. in a large
a heat pump will be used to heat a building during the winter and will then cool the same space during the summer. the
Subject a piece of steel to a case hardening process in which carbon is forced by diffusion through a layer on the surface of the piece. For this purpose, the piece of steel will be placed in a carbon-rich atmosphere in a special furnace.
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