Ashaft of carbon steel (aisi 1010) with a diameter of 0.1 m is heated in a gas furnace at 1200 k. the convection heat transfer coefficient is 100 w/m2. if the initial shaft temperature when entering the furnace is 300 k
a. how much time does it take for the center of the shaft to have a temperature of 800 k?
b. at the time of the answer (a) what is the difference in surface temperature and center of the axis?

Aria drove to the store, did some shopping, and then came home. during maria's trip, when was her displacement equal to zero?

Which of the following is a characteristic shared by both electron and light microscopes? a. they both employ the use of objective lenses. b. both microscopes require an internal camera to visualize the specimen. c. both microscopes have a resolving power of 0.01 nm. d. they both utilize white light to magnify the specimen.

The heater element of a 120 v toaster is a 5.4 m length of nichrome wire, whose diameter is 0.48 mm. the resistivity of nichrome at the operating temperature of the toaster is 1.3 × 10-6 ω·m. the toaster is operated at a voltage of 120 v. (a) what is the power drawn by the toaster? (b) if the cost of electricity is 12 ¢ per kilowatt-hour, and it takes 2 minutes to toast bread, how much does it cost for toasted bread? (c) when the heater element is at room temperature, is the resistivity in the nichrome wire greater than, less than, or equal to it’s resistivity when at operating temperature? explain.