una cinta transportadora a debe girar a 5 rpm. El eje del motor, que gira a una velocidad de 3000 rpm y cuyo diámetro mide 2 mm, está conectado a una polea de 100 mm de diámetro. Sobre el eje de ésta se monta una nueva polea de 8 mm de diámetro que se une, mediante una correa, a la polea que arrastra a la cinta.

What is tan(61)? а. 1.80 b. 0.49 c. 0.61 d. 0.87

Arod of some material 0.20 m long elongates 0.20 mm on heating from 21 to 120°c. determine the value of the linear coefficient of thermal expansion [in (degrees c)^-1] for this material.

How is coal extracted from mountaintop removal mines? a. dynamite is used to create underground tunnels where miners go to extract the coal. b. dynamite is used to break apart rocks and then draglines are used to remove the broken rock and reach the coal. c. coal in mountaintops is extracted by digging strips in the landscape to reach the coal. d. placer deposits in mountain river bottoms are removed by