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melomori [17]
3 years ago
13

En un juego de béisbol, un lanzador logra

Physics
1 answer:
ratelena [41]3 years ago
5 0

Answer:

E cinetica = 140.24 [J] "unidades en Joules"

Explanation:

Para poder solucionar este problema debemos tener un dato aproximado de la masa de la pelota de beisbol, ya que en el problema este dato no fue dado, realizamos una busqueda por internet y encontramos que la masa de una pelota de beisbol es de aproximadamente m = 142 [gr].

Datos iniciales:

m = masa = 0.142 [kg]

v = velocidad = 160 [km/h]

debemos convertir de kilómetros por hora a metros por segundo.

160[\frac{km}{h} ]* 1000 [\frac{m}{1km} ]*1[\frac{h}{3600s} ]\\44.44[\frac{km}{h} ]

Sabemos que la energia cinetica se define por medio de la siguiente ecuacion:

E_{k}=0.5*m*v^2\\reemplazando\\\\E_{k}=0.5*0.142*(44.44)^{2}\\E_{k}=140.24[J]

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Explanation:

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F=mg

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w=4900×2

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Sloan [31]

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A uniform ladder of mass and length leans at an angle against a frictionless wall .If the coefficient of static friction between the ladder and the ground is , determine a formula for the minimum angle at which the ladder will not slip.

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Write the dimension of a / b in the x = at + bt2. Where x is the distance and t is the time?​
Luba_88 [7]

The dimension of a/b where x is the distance and t is the time is T

Given the expression

x = at + bt²

where

x is the distance

t is the time

Based on the homogeneity principle, the expression on the left-hand side must be equal to that on the right. Hence;

x = at

a = \frac{x}{t}

Since x is the distance and distance is measured in metres, the dimension equivalent will be the length 'L'

Since t is the time and time is measured in seconds, the dimension equivalent will be the seconds 'T'

a=\frac{L}{T}

Similarly;

x  = bt²

b=\frac{x}{t^2}\\b=\frac{L}{T^2}

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Hence the dimension of a/b is T

4 0
3 years ago
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