Answer:
Answer
Explanation:
A solid because each solids has various shapes and volume. scientist uses variety of tools such as, Cylinder,scaler, etc to differentiate the solids.
Answer:
123.18 nm
Explanation:
Given:
- Refractive index of the glass=1.5
- Index of magnesium fluoride=1.38
- Wavelength of the light =680 nm
Let t be the thickness of the film. The relation between the wavelength of light in film and thickness of the film in order to have no reflection is given by
![2t=\dfrac{\lambda_{film}}{2}\\t=\dfrac{\lambda_{film}}{4}](https://tex.z-dn.net/?f=2t%3D%5Cdfrac%7B%5Clambda_%7Bfilm%7D%7D%7B2%7D%5C%5Ct%3D%5Cdfrac%7B%5Clambda_%7Bfilm%7D%7D%7B4%7D)
Now According to question we have
![\lambda_{film}=\dfrac{\lambda_{film}}{n}](https://tex.z-dn.net/?f=%5Clambda_%7Bfilm%7D%3D%5Cdfrac%7B%5Clambda_%7Bfilm%7D%7D%7Bn%7D)
where n is the refractive index of the film.
![\lambda_{film}=\dfrac{680}{1.38}\\\lambda_{film}=492.75\ nm](https://tex.z-dn.net/?f=%5Clambda_%7Bfilm%7D%3D%5Cdfrac%7B680%7D%7B1.38%7D%5C%5C%5Clambda_%7Bfilm%7D%3D492.75%5C%20nm)
Now thickness t is given by
![t=\dfrac{492.75}{4}\\t=123.18\ \rm nm](https://tex.z-dn.net/?f=t%3D%5Cdfrac%7B492.75%7D%7B4%7D%5C%5Ct%3D123.18%5C%20%5Crm%20nm)
Hence the thickness of the film is calculated in order to have no reflection.
For the given problem, we calculate the required time by
using the formula P = W/t.
P = [(1/2)mv_f^2 – (1/2)mv_i^2]/ t
The car accelerates from 0 -58 mph, so the power engine will
be
P = (1/2) x m x 58^2 / t = 1682 m / t
According to the problem, the engine produces full power so
the time required can be calculated as
420.5 m / 1.40 = 1682 m / t
t = 5.6 seconds
Answer:
The amount of time needed for this heating to occur is 126.25 min
Explanation:
Given;
power required to heat the room = 2kW
volume of the room = 5 m X 5 m X 6 m = 150 m³
atmospheric pressure at sea level = 101 Kpa
Internal energy available in this room, E = PV
= 101 Kpa*150m³
= 15,150 Kpa.m³ = 15,150 KJ
P*t = E
where;
t is the time required to heat this room
1 kW = 3600 kJ/h
2 kW = 7200 kJ/h
![t = \frac{E}{P} = \frac{15150 KJ}{7200\frac{KJ}{h}} =2.104 {hours} = 126.25 min](https://tex.z-dn.net/?f=t%20%3D%20%5Cfrac%7BE%7D%7BP%7D%20%3D%20%5Cfrac%7B15150%20KJ%7D%7B7200%5Cfrac%7BKJ%7D%7Bh%7D%7D%20%3D2.104%20%20%7Bhours%7D%20%3D%20126.25%20min)
Therefore, the amount of time needed for this heating to occur is 126.25 min
Answer:
<h2>1000 kg</h2>
Explanation:
The mass of the car can be found by using the formula
![m = \frac{f}{a} \\](https://tex.z-dn.net/?f=m%20%3D%20%20%5Cfrac%7Bf%7D%7Ba%7D%20%20%5C%5C%20)
f is the force
from the question we have
![m = \frac{3000}{3} = 1000 \\](https://tex.z-dn.net/?f=m%20%3D%20%20%5Cfrac%7B3000%7D%7B3%7D%20%20%3D%201000%20%5C%5C%20)
We have the final answer as
<h3>1000 kg</h3>
Hope this helps you