When a substance goes directly from a gaseous state to a solid state as dry ice does

Physics

2 answers:

Naddik [55]3 years ago

6 0

Answer: Sublimation I think.

Explanation:

wlad13 [49]3 years ago

4 0

Answer:

Sublimation

Explanation:

not entirly sure if I'm correct

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100 newtons 5 seconds how do you find the momentum

UNO [17]

F = ma = m dv/dt

F dt = m dv

integrate both sides ( assuming constant force , mass) , zero inital conditions

Ft = mv

mv = P

P = Ft = 5 * 100 = 500 N.s

3 0

3 years ago

We can reasonably model a 90-W incandescent lightbulb as a sphere 5.7 cm in diameter. Typically, only about 5% of the energy goe

o-na [289]

Answer:

See answer

Explanation:

Given quantities:

$\eta = 0.05\\ W=90[W]\\r=0.0285[m]$

where $\eta$ is the efficiency of the lightbulb (visible light is 5% of the total power), $W$ is the total power of the lightbulb, r is the radius of the lightbulb in meters.

Intensity is power divided by area:

$I =\frac{P}{A}$

a) Now the effective power is $\eta*W$ , therefore:

$I =\frac{\eta*W}{\pi r^2}=\frac{0.05*90}{4\pi (0.0285)^2}=440.87[W/m^2]$

b) Now the intensity is the average poynting vector is related to the magnitudes of the maximum electric field and magnetic field amplitudes, following:

$S_{average}= \frac{EB}{2\mu_{0}}[W/m]$