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3 years ago

Please any one have a clue on this one? Really need help on this

Physics

1 answer:

lana66690 [7]3 years ago

5 0

Oxygen and Neon have the same number of valence electrons because both the compounds are in the same group and the outer orbital of both the compounds consists of 6 electrons

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A spring stretches by 0.0177 m when a 2.82-kg object is suspended from its end. How much mass should be attached to this spring

Artemon [7]

The mass attached to the spring must be 0.72 kg

Explanation:

The frequency of vibration of a spring-mass system is given by:

$f=\frac{1}{2\pi} \sqrt{\frac{k}{m}}$ (1)

where

k is the spring constant

m is the mass attached to the spring

We can find the spring constant by using Hookes' law:

$F=kx$

where

F is the force applied on the spring

x is the stretching of the spring

When a mass of m = 2.82 kg is applied to the spring, the force applied is the weight of the mass, so we have

$mg=kx$

and using $g=9.8 m/s^2$ and $x=0.0177 m$ , we find

$k=\frac{mg}{x}=\frac{(2.82)(9.8)}{0.0177}=1561.3 N/m$

Now we want the frequency of vibration to be

f = 7.42 Hz

So we can rearrange eq.(1) to find the mass m that we need to attach to the spring:

$m=\frac{k}{(2\pi f)^2}=\frac{1561.3}{(2\pi (7.42))^2}=0.72 kg$

#LearnwithBrainly

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3 years ago

Will give Brainliest!! Question attached.

ss7ja [257]

Answer:

im pretty sure it is 3.0 K

Explanation:

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3 years ago

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the second law of thermodynamics states that thermal energy can floe from colder objects to hotter objects?

hodyreva [135]

BIg, big questions in Thermodynamics. ...
Not without "help" it can't. There are two versions of this. One is that it is impossible to take heat from something and convert it completely into work - there has to be some waste at a lower temperature. The other is that heat will not "spontaneously" go from a colder place to a warmer place. So, a domestic fridge needs a device to transfer the heat, that's that buzzing sound of a motor driving a refrigerant round in a cycle, taking heat out the fridge and making the surrounding warmer. It's also called a heat pump. The area near where the pump puts its heat can be felt to be warm.

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4 years ago

Vector may be zero .why?

Papessa [141]

Answer:

We define a vector as an object with a length and a direction.With no length, the zero vector is not pointing in any particular direction, so it has an undefined direction.

Explanation:

Pls mark me brainliest :)

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3 years ago

Define the focus of a concave lens

Sophie [7]

Answer:

Principal focus of concave lens - 

★ The point at which rays parallel to principal axis coming from infinity appear to converge after being refracted from concave lens is called the principal focus of concave lens.

________________________

• Additional information - 

★ Principal focus - A number of rays parallel to the principal axis after reflection from a concave mirror meet at a point on the principal axis or appear to come from a point after reflection from a convex mirror on the principal axis. This is called principal focus.

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3 years ago