? Physics Homework--- How does a thermos flask work?

1.) A womans mass is 6.5 kg. If she climbs a flight of stairs 5 m high, how much potential energy does she have? PE =mgh 6.5 (9.8)(5) 2.) A man is jogging at 2m/sec.

If his mass is 8.4 kg what is his kinetic energy? (8.4 KG is a very skinning man) KE = 0.5 m V^2 0.5 ( 8.4) (2^2).

They are about 10% of what live persons would weigh....

As the stone falls 64 meters, its vertical velocity increases at the rate of 9.8 m/s each second. Use the following equation to determine its vertical velocity when it lands. Vf = vi + a * t, vi = 0 vf = 9.8 * 3.614 = 35.4172 m/s Since the stone is falling, this velocity is negative.

To determine the angle, use the following equation. Tan? = Vertical ÷ Horizontal = -35.4172 ÷ 23 The angle is approximately 57?

Below horizontal. Speed =?(Vertical^2 + Horizontal^2) =?(-35.4172^2 + 23^2) This is approximately 42.2 m/s.