4 In the figure, a mass m = 6.71 kg oscillates in a vertical circle at the end of a chord of negligible mass and length L = 2.36 m. The mass is released from rest from a horizontal position. What is the magnitude of the angular momentum (in kg • m2 / s) at the lowest point of its path with respect to the axis perpendicular to the vertical circle that passes through its center?

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.

Which component of the earth’s atmosphere is decreased due to photosynthesis?

Match each type of lever with the correct diagram. 1. first-class 2. third-class 3. second-class