For heat transfer purposes a standing man can be modeled as a 32 cm diameter, 159 cm long vertical cylinder with both top and bottom surfaces insulated and with the side surface at an average temperature of 34 degrees c. for a convection heat transfer coefficient of 20 w/m^2, determine the rate of heat loss from this man by convection in an environment at 25 degrees c.

Two particles of masses m and 2m are placed on a smooth horizontal table. a string, which joins these two masses, hangs over the edge supporting a pulley, which suspends a particle of mass 3m.the pulley has negligible mass. the two parts of the string on the table are parallel and perpendicular to the edge of the table. the hanging parts of the string are vertical. find the acceleration of the particle of mass 3m.

A-4.60 μc charge is moving at a constant speed of 6.80×105 m/s in the +x−direction relative to a reference frame. at the instant when the point charge is at the origin, what is the magnetic-field vector it produces at the following points.

Astudent wears sunglasses to her read a book more easily which wave interaction occurs as light passes from the air into the plastic lenses? a polarization b.refraction c.diffraction d. interference