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4 years ago

Could a nucleus that has one proton but no neutrons exist?

1 answer:

8 0

Yes, but there is only 1 atom like that and is is hydrogen. Hydrogen is the only element that could have a nucleus with one proton and no neutrons exist.

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The maximum allowed leakage of microwave radiation from a microwave oven is 5.0 mw/cm2. if microwave radiation outside an oven h

irina [24]

Answer:

194 V/m

Explanation:

In order to find electric field, we can use the formula of power density

i.e Pd = E^2 / Z

where:

Pd = power density in W/m^2

E = electric field strength in V/m

Z = impedance of free space = 120 * π

E = sqrt(Pd * Z) -----> re-arranging it for E

before solving, convert Pd unit into W/m^2

Pd= 5mW/cm^2 = 50 W/m^2

Solving for E:

E= sqrt(50 * 120 * π)

E = 137.3 V/m

the above value is RMS value

In order to find the peak amplitude of the oscillating field will therefore be 137.3 * sqrt(2) = 194 V/m

8 0

4 years ago

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If a hockey player starts from rest and accelerates at a rate of 2.1 m/s2 how long does it take him to skate 30m

OLga [1]

Hello!

<span>Let us apply the time function of space, in the uniform uniform motion (UUM)
</span>
Formula: $S = S_{o} + V_{o}* t + a* \frac{t^2}{2}$

Data:
S (Final position) = 30 m
So (Initial Position) = 0 m
Vo (Initial velocity) = 0 m/s
t (time) = ? (in seconds)
a (acceleration) = 2.1 m/s²

Solving:
$S = S_{o} + V_{o}* t + a* \frac{t^2}{2}$
$30 = 0 + 0*t + 2.1* \frac{t^2}{2}$
$30 = \frac{2.1t^2}{2}$
$30*2 = 2.1t^2$
$60 = 2.1t^2$
$2.1t^2 = 60$
$t^2 = \frac{60}{2.1}$
$t^2 \approx 28.5$
$t \approx \sqrt{28.5}$
$\boxed{\boxed{t \approx 5.3\:s}}\end{array}}\qquad\quad\checkmark$

Answer:
<span>C. 5.3s</span>

5 0

4 years ago

The magnetic field in a plane monochromatic electromagnetic wave with wavelength λ = 598 nm, propagating in a vacuum in the z-di

Oksanka [162]

Answer:

For this given plane monochromatic electromagnetic wave with wavelength λ=598 nm, the wavenumber is $k=0,0105\ x\ 10^{-9}\ m^{-1}$ .

Explanation:

For a plane electromagnetic wave we have that the electrical and magnetic field are:

$E(r,t)=E_{0}\ cos ( wt-kr)\\\ B(r,t)=B_{0}\ cos(wt-kr)$

In this case we have the data for the magnetic field. We are told that the magnetic field in a plane electromagnetic wave with wavelength λ=598 nm, propagating in a vacuum in the z direction ( $\hat k$ ) is described by

$B=8.7\ x\ 10^{-6}\ T sin(kz-wt) (\hat i+\hat j)$

( $\hat i,\hat j, \hat k$ are the unit vectors in the x,y,z directions respectively)

The wavenumber k is a measure of the spatial frequency of the wave, is defined as the number of radians per unit distance:

$k=\frac{2\pi}{\lambda}$

where λ is the wavelength

So we get that

$k=\frac{2\pi}{\lambda} \rightarrow k=\frac{2\pi}{598 nm} \rightarrow k=0,0105\ x\ 10^{9}\ m^{-1}$

The wavenumber is

$k=0,0105\ x\ 10^{9}\ m^{-1}$ .

4 0

3 years ago

Even under the most ideal conditions, only about 8% of the internal energy of the steam produced in a steam engine can be conver

Anna71 [15]

As per the law of conservation of energy, no energy is created or destroyed. Therefore, we can conclude that the remaining 92% of energy released in electricity generation from steam power plants is converted to other, non-utilizable forms of energy. Such forms include sound energy or thermal energy between the moving parts of the plant.

8 0

4 years ago

What is most important when selecting the right pfd for a passenger on board your boat?

Karolina [17]

The most essential while choosing the privilege PFD for a traveler is the information required for choosing right PFD for the traveler's body weight and trunk size.Note that the offspring of what age under 8 years old are required to wear legitimately secured PFD while on vessel unless in securely closed cabin.

3 0

3 years ago

Read 2 more answers