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A 1-in diameter pure copper sphere is suspended in a room where the walls and air are all at 300K. The natural convection heat transfer coefficient around the sphere is 25 W/m both radiation and convection may be important. If the copper sphere is initially at 1000K, perform an energy balance on the sphere in order to write a differential equation describing the rate of change of temperature with time of the sphere. You do not need to solve the expression.
in a paint plant semiautomatic mixers are normally used. it takes 8 minutes for an operator to load a mixer with the
Describe the four incorrect assumptions concerning robot - arm movement that are most frequently responsible for impact accidents.
The wheel of a crane lift is rolling on a flat rail. The radius of the wheel is 4 in, the contact length and force are 2.5 in and 1 ton respectively, and E = 30 MPa and ν = 0.3 for both parts. Determine (a) the maximum contact pressure, (b) the wi..
lie detectors are sometimes used in criminal investigations but they do not function perfectly. if a suspect is guilty
the lifetime in hours y of an electronic component is a random variable with density function given bynbspfy1100 e-y100
two frictionless balls are placed in a frictionless bowl. the left ball a has a radius of 3.00 in. and a weight of 10.0
air at 100 lbf in 2 500 degree f and a velocity of 100 ft s enters a nozzle operating at steady state and expands
a round casting is 0. 2 m in diameter and 1 m in length. another casting of the same metal is elliptical in cross
a 14 mm diameter 50 mm long mild steel rod undergoes a stress test. a tensile force of 18800 n is applied and the rod
determine the magitudes of the horizontal and vertical reactions of the chair on the man at the instant . At this instant he has a speed of 6 m/s, which is increasing at 0.5 m/s^2.
a shrink fit assembly is to be performed on a pin and collar. with the starting dia. being 0.875 the pin needs to be
the metal rhodium has a fcc crystal structure. if the angle of diffraction for the 311 set of planes occurs at 36.12deg
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