Elena la “Exterminadora” está explorando un castillo. Un dragón la ve y la persigue por un pasillo. Elena se mete en una habitac
ión y trata de cerrar la pesada puerta antes de que el dragón la atrape. Inicialmente, la puerta es perpendicular a la pared, así que debe girar 90° para cerrarse. La puerta tiene 3.00 m de altura y 1.25 m de anchura, y pesa 750 N. Puede
despreciarse la fricción en las bisagras. Si Elena aplica una fuerza de 220 N al borde de la puerta, perpendicular a ella, ¿cuánto tardará en cerrarla?
despreciarse la fricción en las bisagras. Si Elena aplica una fuerza de 220 N al borde de la puerta, perpendicular a ella, ¿cuánto tardará en cerrarla?
1 answer:
You might be interested in
I think this is right I hope this is right for you
Answer: 75,242.9 m/s
Explanation:
from the question we are given the following parameters
mass of Lion (ML) = 169,169 kg
velocity of lion (VL) = 777,377.7 m/s
mass of Gazelle (Mg) = 31,731.7 kg
velocity of Gazelle (Vg) = 63,863.8 kg
mass of Lion and Gazelle (M) = 200,900.7 kg
velocity of Lion and Gazelle (V) = ?
The first figure below shows the motion of the Lion and Gazelle with their direction.
The second diagram shows the motion of the Lion and Gazelle with their directions rearranged to form a right angle triangle.
from the triangle formed we can get the velocity of the Lion and Gazelle immediately after collision using their momentum and Phytaghoras theorem
momentum = mass x velocity
momentum of the Lion = 169,169 x 77,377.3 = 13,089,840,463.7 kgm/s
momentum of the Gazelle = 31,731.7 x 63,863.8 = 2,026,506,942.46 kgm/s
momentum of the Lion and Gazelle = 200,900.7 x V
now applying Phytaghoras theorem we have
13,089,840,463.7 + 2,026,506,942.46 = 200,900.7 x V
15,116,347,406.16 = 200,900.7 x V
V = 75,242.9 m/s
Answer:
Explanation:
It is given that three cars has same mass m with speed
suppose rest two cars also has same mass m
As there is no external force therefore momentum is conserved
Initial Momentum
Final momentum
where v=final velocity
thus final velocity is