1. An 80 kg skydiver uses a parachute to produce an applied force of 700 N while falling with an initial velocity of 40 m/s

Awave is produced in a slinky as shown. what is the direction of the slinky wire at point p as the waves travel through this point?

Can anybody me with this? ? (picture included.)

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.