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lawyer [7]
3 years ago
13

A 25 N force at 60° is required to set a crate into motion on a floor. What is the value of the static friction?

Physics
1 answer:
True [87]3 years ago
3 0
The normal force of the force given is calculated through the equation,
 
                                 Fn = F(sin θ)
where Fn is the normal force, F is the force, and θ is the angle. 
  
                                Fn = (25 N)(sin 60°) = 21.65 N

The x-component of the force applied is,
                               Fx = (25 N)(cos 60°) = 12.5 N

The value of the coefficient of static friction is calculated through the equation,
                              F = μFn
                              μ = Fx / Fn = 12.5 N / 21.65 N = 0.577
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This mathematical model describes the changes that occur in a sample of
Veseljchak [2.6K]

Answer:

the correct answer is B

Explanation:

The kinetic model of the movement describes that the movement of the molecules increases with the increase of their internal energy, which in a macroscopic sample is reflected in an increase in the temperature of the sample.

The sample graph shows the function of temperature over time, which is why our kinetic model establishes that there is an increase in the movement of water molecules.

Consequently the correct answer is B

8 0
3 years ago
What mass, in grams, of aluminum fins could 2571 J of energy heat from 15.73 ∘C to 26.50 ∘C ? Aluminum has a specific heat of 0.
nadya68 [22]

Answer:

266 g or 0.266 kg

Explanation:

The formula for specific heat capacity is given as,

Q = cm(t₂-t₁) ..................... Equation 1

Where Q = Heat Energy, c = specific heat capacity of Aluminum, m = mass of the aluminum fins, t₁ = initial temperature, t₂ = final temperature.

make m the subject of the equation,

m = Q/c(t₂-t₁)................... Equation 2

Given : Q = 2571 J, c = 0.897 J/g.°C, t₁ = 15.73 °C, t₂ = 26.50 °C.

Substitute into equation 2

m = 2571/[0.897×(26.5-15.73)]

m = 2571/9.661

m = 266 g or 0.266 kg

Hence the mass of the Aluminum fins = 266 g or 0.266 kg

5 0
4 years ago
When the shuttle bus comes to a sudden stop to avoid hitting a dog, it decelerates uniformly at 4.5 m/s2 as it slows from 9.3 m/
saw5 [17]
V=u+at
V= speed 0 m/s
u = initial speed 9.3 m/s
a = acceleration - 4.5 (negative)
0=9.3-4.5t
t=9.3/4.5= ? :) seconds

3 0
3 years ago
Which branch deals with anything foreign (other countries)<br> A executive b legislative c judicial
Schach [20]
It would be A. Executive branch
6 0
3 years ago
Los barbijos de tela, a diferencia de los quirúrgicos, poseen una filtración de partículas de aproximadamente 0.000003979 [m]. E
shusha [124]

Answer:

El valor en notación científica es 3.98*10⁻⁶.

Explanation:

La notación científica es una manera rápida de representar un número utilizando potencias de base diez. Esta notación se utiliza para poder expresar muy fácilmente números muy grandes o muy pequeños.

Los números se escriben como un producto:

a*10ⁿ

donde:  

  • a es un número real mayor o igual que 1 y menor que 10, al cual se le agrega un punto decimal después de la primera cifra si se trata de un número que no es entero.
  • n es un número entero, que recibe el nombre de exponente u orden de magnitud. Representa el número de veces que se desplaza la coma. Siempre es un número entero, positivo si se desplaza a la izquierda, negativo si se desplaza a la derecha.

Para escribir el número 0.000003979 en notación científica, se realizan los siguientes pasos:

  • Se mueve la coma decimal hacia la derecha tantos espacios hasta llegar a la derecha del primer dígito.
  • Se escribe entonces este número, que será el coeficiente a en la expresión del producto anterior.  
  • Se escribe la base 10 con el exponente igual a la cantidad de espacios que se mueve la coma. Este es un número negativo porque la coma se desplaza a la derecha.

Entonces, en este caso:

  • a= 3,979 ≅ 3,98
  • n= -6

Entonces,<u><em> el valor en notación científica es 3.98*10⁻⁶.</em></u>

5 0
3 years ago
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