In february 1955, a paratrooper fell 360 m from an airplane without being able to open his chute but happened to land in snow, suffering only minor injuries. assume that his speed at impact was 60 m/s (terminal speed), that his mass (including gear) was 80 kg, and that the force on him from the snow was at the survivable limit of 1.2 x 10^5n.
(a) what is the minimum depth of snow that would have stopped him safely?
(b) what is the magnitude of the impulse on him from the snow?

Answered

Explanation:

V_i = initial velocity = 60 m/s

F = average force = 1.2 x 105 N

m = mass = 80 kg

a = deceleration caused = F/m = 1.2 x 105 /80 = 1500 m/s^2

d = stopping distance

V_f = 0 m/s

Using the equation

V-f^2 = V-i^2 + 2 a d

02 = 602 + (2) (-1500) d

d = 1.2 m

multiply 2kg by latent heat of vap

answer: the metamorphic rocks are formed when they are exposed to high pressure and high temperatures. this happens when one of the earth's plates comes in contact with the other plate by traveling in opposite directions, straight into each other or slipping under one another. the friction that is caused by this activity results in   melting of rocks and when it cools they are known as metamorphic rocks. this process needs a controlled amount of pressure and temperature otherwise it may turn into magma.