In the high jump, fran\'s kinetic energy is transferred into gravitational poten

Question

In the high jump, fran's kinetic energy is transferred into gravitational potential energy without the aid of a pole. with what minimum speed must fran leave the ground in order to lift her center of mass 2.10 m and cross the bar with a speed of 0.70 m/s? A cubic box of volume 5.1 times 10^-2m^3 is filled with air at atmospheric presence at 20 degree C. the box is closed and heated to 180 degree C. what is the net force on each side of the box? what is the rms speed of nitrogen molecules contained in a 8.5-m^3 volume at 2.1 atm if the total amount of nitrogen is 1300 mol? (nitrogen molecule mass is 46.5 times 10^-23 kg)

Explanation / Answer

5.

V = speed of launch

Vt = speed at top = 0.70 m/s

h = height = 2.10 m

Using conservation of energy

(0.5) m V2 = (0.5) m Vf2 + mgh

V2 = Vf2 + 2gh

V2 = 0.702 + 2 (9.8) (2.10)

V = 6.5 m/s

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