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Katen [24]
3 years ago
9

In severe head-on automobile accidents, a deceleration of 60 g’s or more (1 g 5 32.2 ft/s2) often results in a fatality. What fo

rce, in lbf, acts on a child whose mass is 50 lb, when subjected to a deceleration of 60 g’s?
Physics
1 answer:
Musya8 [376]3 years ago
3 0

Answer:

The resulting force on the child is 3000 lbf

Explanation:

To find the force that acts on a child of 50 lb with a deceleration of 60 g's, we can use the formula:

Force = mass * acceleration

To find the force in lbf, we need to use the mass in lb and the acceleration in g (standard unit of gravity).

So we have that:

Force = 50 * 60

Force = 3000 lbf

So the resulting force on the child is 3000 lbf.

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At 30.0 m below the surface of the sea (density = 1 025 kg/m3), where the temperature is 5.00°C, a diver exhales an air bubble h
stira [4]

Answer:

The volume is V_a  = 1.510 *10^{-5} m^3

Explanation:

From the question we are told that

     The depth below the see is  d_1  =  30.0 \ m

     The density of the sea is  \rho_s  =  1025 \ kg /m^3

      The temperature at this level is T_d = 5.00 ^oC = 278 \ K

      The volume of the air bubble at this depth is  V_d  =  0.95 \ cm^3  = 0.95 *0^{-6}\ m

     The temperature at the surface is  T_a  =  20^oC =293\  K

Generally the pressure at the given depth is mathematically evaluated as  

        P_d  =  P_o + \rho_s  *  g  *  d

Where P_o is the atmospheric pressure with a constant value

        P_o  =  1.013 *10^{5} \ Pa

substituting values

       P_d  = 1.013 * 10^{5} * + (1025 *  9.8 *  30 )

        P_d  = 4.02650 * 10^{5} \  Pa

According to the combined gas law  

          \frac{P_a *  V_a }{T_a }  =  \frac{P_d *  V_d }{T_d }

=>      V_a  =  \frac{4.026650 *10^{5} *  0.95 *10^{-6} *  293 }{278   *  1.013*10^{5} }

=>     V_a  = 1.510 *10^{-5} m^3

3 0
4 years ago
A 60 kg person runs up a set of stairs in B-Building 6 meters high, in a time of 8 seconds.
Assoli18 [71]

Answer:

I could be wrong but I think it is 560 W

6 0
3 years ago
Why are experiments often performed in laboratories?
Marrrta [24]

Answer:

B

Explanation:

Laboratories are usually controlled: however, in public places, there are way too many factors that could change an experiment

6 0
3 years ago
Si tenemos tres cubos del mismo tamaño (hierro, madera e icopor). ¿Qué diferencias puede encontrar entre ellos?
cricket20 [7]

Answer: La diferencia es el peso (o la masa), siendo que el cubo de hierro es el mas pesado, después viene el de madera y después el de icopor.

Explanation:

Ok, los 3 cubos tienen el mismo tamaño, lo que implica que tienen el mismo volumen.

Ahora es útil recordar la relación:

Densidad = masa/volumen.

Masa = densidad*volumen.

Nosotros sabemos que la densidad del hierro es mas grande que la de la madera, y la densidad de la madera es mas grande que la del icopor.

Entonces, por la relación anterior, y sabiendo que todos los cubos tienen el mismo volumen, podemos reconocer que el cubo de hierro tiene mayor masa, después viene el de madera y después viene el de icopor.

Y sabiendo que:

masa*gravedad = peso

podemos saber que el cubo mas pesado es el de hierro, después el de madera y después el de icopor.

Además de esta diferencia, también hay otras que no dependen tanto del tamaño del objeto, como pueden ser las capacidades caloríficas, el como reaccionan a campos eléctricos y cosas así que son triviales, pues son diferentes para casi todos los materiales.

5 0
3 years ago
Tính lực tương tác giữa 2 điện tích q1=4.10^-6C và q2=-3.10^-6C cách nhau một 3cm đặt trong dầu hoả = 2
olga2289 [7]

Explanation:

decimal diamond ml dias and ka n t u t a n mo papa mo

4 0
3 years ago
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