A12-m-long section of a 5-cm-diameter horizontal hot-water pipe passes through a large room whose temperature is 27°c.

if the temperature and the emissivity of the outer surface of the pipe are 73°c and 0.8, respectively, determine the rate of heat loss from the pipe by (a) natural convection and (b) radiation.

Gravity is pulling an object into the sun. the closer the object gets to the sun, the greater the gravitational force that acts on the object, increasing its acceleration. a line graph plotting the speed of the object against time would have which shape? a: straight line of positive slope b: curved line that slopes upward c: curved line that slopes downward d: straight line of negative slope