Water flows through a circular tube which transverse section has a diameter of 0.3 m. What speed will the water have inside the tube if the flow is 1.20 m3/s? D. If the pipe of the previous exercise is connected to a hose and the speed there is 3.8 m/s, what is the diameter of the hose?

Athin, square metal plate measures 14 cm on each side and has emissivity of 0.60. the plate is heated to a temperature of 745°c. what is the rate at which the plate radiates energy ? the stefan-boltzmann constant is 5.67 × 10-8 w/(m2 ? k4). remember that the plate will radiate energy from both its top and bottom surfaces.

Suppose a comet has an orbital period of 309.1 years around the sun. what is it’s average distance from the sun?

How much energy must a refrigerator absorb from 225 g of water so that the temperature of the water will drop from 35°c to 5°c