Aman stands still on a moving escalator and a woman walks past him in the same direction as the escalator. to a stationary observer, the man has a speed of 0.4 m/s and the woman has a speed of 0.52 m/s. from the frame of reference of the man on the escalator, how fast is the woman walking?

What happens to the light rays when they hit the specimen?

The necleus of an atom is made up of what subatomic particles?

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.