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Furkat [3]
3 years ago
13

Se coloca una tuerca con una llave, como muestra la figura, si el brazo r= 30 cm y el torque de apriete recomendado para la fuer

za es de 30 Nxm, Cuàl debe ser el valor de la fuerza F aplicada?
Physics
1 answer:
irina [24]3 years ago
6 0

Answer:

F = 100 N

Explanation:

The torque is given by the expression

      τ = F x r

where bold letters indicate vectors, the magnitude of this expression is

     τ = F r sin θ

In general, when tightening a nut, the force is applied perpendicular to the arm, therefore  θ = 90 and sin 90 = 1

      τ = F r

      F = τ / r

calculate

      F = 30 / 0.30

      F = 100 N

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FromTheMoon [43]

Answer: this would be D.) What does a turntable built into a track look like

Explanation:

3 0
3 years ago
1A.)A railroad car of mass 21700 kg moving with a speed of 3.36 m/s collides
Pepsi [2]

Answer:

(a) 2.03 m/s

(b) 2.15 m/s

Explanation:

(a)

From the law of conservation of momentum, the sum of initial momentum equals the sum of final momentum

Momentum, p=mv where m is the mass and v is the velocity

m_1v_1+m_2v_2=(m_1+m_2)v_c where v_c is the common velocity, v_1 and v_2 are velocities of the first railroad car  and the second railroad car respectively, m_1 and m_2 are masses of the first railroad car  and the second railroad car respectively

Substituting the given figures then

21700\times 3.36+41700\times 1.34=(21700+41700)v_c\\63400v_c=128790\\v_c=\frac {128790}{63400}=2.031388013\approx 2.03 m/s

(b)

Momentum, p=mv where m is the mass and v is the velocity

m_1v_1+m_2v_2=m_1v_3+m_2v_4 where v_1 and v_2 are initial velocities of the ball moving towards west and the other ball moving in opposite direction respectively, m_1 and m_2 are masses of the first railroad car  and the second railroad car respectively

Taking west as positive then the opposite direction will be negative hence

0.455\times 7.36+(1.01\times -12.4)= 0.455\times -15.4 + (1.01\times v_4}

Note that when the 0.455 rebounds, it moves towards East and since we took West as positive that is why we give 15.4 as a negative value.

-2.1682=1.01v_4\\v_4=\frac {-2.1682}{1.01}=-2.146732673\approx 2.15 m/s towards East

8 0
4 years ago
Each time the heart beats,what does it do to the blood
Tom [10]
Your blood runs through your blood stream, every vein in your body. without that heartbeat the blood would not make it to the required places it needs to run to and you will lose oxygen and parts of your body and organs will shut down.
6 0
4 years ago
A force does work on an object if a component of the force is
IrinaK [193]

Answer:

A force does work on an object if a component of the force is parallel to the displacement of the object.

Explanation:

Work, a measurement of energy is said to be done when a force applied to an object results in the movement of that object to a certain distance and direction. Force is the act of push or pulls occurs on an object as a result of the interaction between that object with another one and displacement is the distance and direction covered by that object as a result of the force applied on it.

The work done (W) by a constant force (F) is equal to the product of the force in the direction of displacement of the object and the distance (d) moved by the object i.e., W = F * d.

The angle between the displacement and the force is θ, then the work done, W = Fd cos θ  ........ (1)

Positive work - Force acts in the same direction with respect to the displacement of the object. Here, θ is zero, so cos θ i.e., cos 0 is 1. Therefore, from the equation (1), W = Fd (i.e., work done by the force is positive).

Negative work - Force acts in the opposite direction with respect to the displacement of the object.  Here, θ is 180°, so cos θ i.e., cos 180° is -1. Therefore, from the equation (1), W = -Fd (i.e., work done by the force is negative).

If a force is applied to an object and it does not move, then the work done is zero i.e., W = F * 0 = 0. Also, if the force and displacement are at right angle to each other, then θ is 90°. Therefore, from the equation (1), W = 0 since cos 90° is zero.

7 0
4 years ago
Which type of reaction occurs when you bake a tray of cookies?
OleMash [197]

Answer:

b

Explanation:because endothermic contains heat so cookies need heat

6 0
3 years ago
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