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3 years ago

Non-moving electrical charges are often called

Physics

2 answers:

Setler79 [48]3 years ago

4 0

Answer:

Explanation:

Burka [1]3 years ago

3 0

Answer:
<span>C. static eletricity

</span><span>This is static electricity because it is in equilibrium, that is, it is not moving from one body to another.</span>

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What type of relationship does this graph show?

Schach [20]

Negative because the graph goes down

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4 years ago

3 a There is a thin layer of water between the blade and the ice. Suggest how this affects friction .

Gelneren [198K]

Answer:

The water acts like a lubricant therefore has a smooth motion over the ice.

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3 years ago

In uniform circular motion, how does the acceleration change when the speed is increased by a factor of 3? When the radius is de

crimeas [40]

Answer:

The acceleration will become 9/2 times.

a' =9/2 a

Explanation:

We know that acceleration of a particle when it is moving in the circular path is given as

$a=\omega^2\ r$

r=radius

ω= angular speed

If the speed ω '= 3 ω

If the radius , $r'=\dfrac{r}{2}$

The final acceleration =a'

$a'=\omega^2'\ r'$

$a'=(3\omega)^2\times \dfrac{r}{2}$

$a'=9\omega^2\times \dfrac{r}{2}$

$a'=\omega^2\times \dfrac{9r}{2}$

$a'= \dfrac{9r}{2}\times \omega^2\times r$

$a'=\dfrac{9}{2}a$

Therefore the acceleration will become 9/2 times.

5 0

3 years ago

Imagine an alternative universe where the characteristic decay time of neutrons is 3 min instead of 15 min. All other properties

FrozenT [24]

Answer:

(a) $[Y_{p} ]_{max} = \frac{2f}{1+f}$

(b) $f_{new} = 0.013$ ; $[Y_{p} ]_{max}$ = 0.026

Explanation:

Since the neutron-to-proton ratio at the time of nucleosynthesis is given:

$f = \frac{n_{n} }{n_{p} }$

Therefore:

$n_{n} = f*n_{p}$

Then, to determine the maximum ⁴He fraction if all the available $n_{n}$ neutrons bind to all the protons. Since, there are 2 protons and 2 neutrons in a ⁴He nucleus, it shows that there would be $n_{n}/2$ nuclei of ⁴He.

In addition, a ⁴He nucleus has a mass of $4m_{p}$ , where $m_{p}$ is the mass of one proton. Thus, $n_{n}/2$ nuclei of such nuclei will have a mass of $n_{n}/2$ * $4m_{p}$ .

Assuming that $m_{p}=m_{n}$ , there would be a total of $(n_{n}+n_{p})$ protons and neutrons with a total mass of $(n_{n}+n_{p})*m_{p}$ .

Thus: $[Y_{p} ]_{max} = \frac{2f}{1+f}$

(b) Given:

$t_{nuc} = 200 s$ ; τ $_{n}$ = 3*60s = 180 s

$f_{new} = \frac{n_{nf} }{n_{pf} } = \frac{exp (-200/180)}{5 +[1- exp(-200/180)]} =\frac{0.077}{5.923} = 0.013$

$[Y_{p} ]_{max} = \frac{2f}{1+f}$ = (2*0.013)/(1+0.013) = 0.026

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3 years ago

How does and objects density determine whether the object will sink or float

kap26 [50]

Density means how much mass is concentrated in the given 3d space .thus the more the density the more mass is occupied in the less space.. and thus the objects with lesser density floats on the object with higher density

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3 years ago