At what altitude from the surface of the earth will the gravitational field strength be reduced by 10%. The mass of the earth are 6 ×10²⁴ kg. Radius of the earth = 6.4 ×10⁶ m. Gravitational acceleration, a=9.81ms-²

How are the crust and the inner core alike? a) they are both solid. b) they both have the same temperature. c) they are both under the same pressure. d) they are both very close to the center of the earth.

Which atomic model was proposed as a result of j. j. thomson’s work?

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.