The engines are turned off so there is no tractive force. The train is moving at 20 mph down the incline. What is the required magnitude of the braking force to bring the train to a stop in 1670 ft? (include units with answer)

Which type of current is produced by a wire breaking magnetic field lines and changing the polarity? a. alternating b. direct c. straight d. alternating and direct

Consider a 1000 w iron whose base plate is made of 0.5 cm thick aluminum alloy 2024-t6 (ρ = 2770 kg/m3 and cp = 875 j/kg°c). the base plate has a surface area of 0.03 m2. initially, the iron is in thermal equilibrium with the ambient air at 22°c. assuming 90% of the heat generated in the resistance wires is transferred to the plate, determine the minimum time needed for the plate temperature to reach 200°c.

Calculate the volume of this regular solid. what is the volume of the cone? round your answer to the nearest hundredth