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Un barco va a una velocidad de 45 ml/h, luego el capitán ordena acelerar hasta que la velocidad hasta que la velocidad sea de 60

Sophie [7]

Pregunta completa:

Un barco va a una velocidad de 45 ml/h, luego el capitán ordena acelerar hasta que la velocidad hasta que la velocidad sea de 60 mll/h. si la operación dura 30 minutos.

A cual fue la aceleracion?

B qué distancia recorre?

Responder:

30 millas / hora

26.25 mi

Explicación:

Dado que :

Velocidad inicial, u = 45 mi / hr

Velocidad final, v = 60 mi / hr

Tiempo, t = 30 minutos = 30/60 = 0,5 h

Aceleración, a = cambio de velocidad con el tiempo;

a = (v - u) / t

a = (60 - 45) / 0,5

a = 15 / 0,5

a = 30 millas / h²

Recorrido de distancia, S

S = ut + 0.5at²

S = 45 (0,5) + 0,5 (30) (0,5²)

S = 22,5 + 3,75

S = 26,25 millas

4 0

3 years ago

Consider a metal single crystal oriented such that the normal to the slip plane and the slip direction are at angles of 60 and 3

Scilla [17]

Explanation:

Given that,

Angle by the normal to the slip α= 60°

Angle by the slip direction with the tensile axis β= 35°

Shear stress = 6.2 MPa

Applied stress = 12 MPa

We need to calculate the shear stress applied at the slip plane

Using formula of shear stress

$\tau=\sigma\cos\alpha\cos\beta$

Put the value into the formula

$\tau=12\cos60\times\cos35$

$\tau=4.91\ MPa$

Since, the shear stress applied at the slip plane is less than the critical resolved shear stress

So, The crystal will not yield.

Now, We need to calculate the applied stress necessary for the crystal to yield

Using formula of stress

$\sigma=\dfrac{\tau_{c}}{\cos\alpha\cos\beta}$

Put the value into the formula

$\sigma=\dfrac{6.2}{\cos60\cos35}$

$\sigma=15.13\ MPa$

Hence, This is the required solution.

3 0

3 years ago

HELP PLZ [Kinetic and Potential Energy]

Oliga [24]

Answer:

ok its 58

Explanation:

yes

4 0

3 years ago

A radiographer in a hospital is preparing a sample of technetium-99. Name two protective measures she should be to ensure she is

Hitman42 [59]

Answer: There are many precautionary measures which is to be taken care of while handling technetium-99.

Explanation:

There is a proper separated area for the handling of the 99Tc and all the containers are properly labelled for the use of technetium-99 only.

While working on it, the person is not allowed to eat or drink anything.

Use of gloves, glasses and other preventive measure is also very important when handling radioactive materials.

Try to maintain a proper distance throughout the experiment.

4 0

4 years ago

All objects on earth experience a force of gravity that pulls objects "downward" towards the center of the earth. The force of g

Sergeu [11.5K]

Answer:

The net force is 785 N

Explanation:

The net force = Force in one direction - force in the opposite direction

Here the Downward force due to gravity = 1000N

and the Upward force of air = 215 N

The net force = Downward force due to gravity -Upward force of air

Substituting the given values, we get -

The net force = 1000 -215 = 785 N

Hence, the net force is 785 N

7 0

3 years ago