Answer:
4 Ohms
Explanation:
The challenging part in this circuit is the bridged setup (diamond-shaped arrangement made of the 4 Ohm resistors). In general, this would first need to be transformed using the Wye-Delta transform to be solved, but in this case we can make a valid simplification: since the diamond arrangement is completely symmetrical, the voltage at the top and the bottom tip of the "diamond" will be identical and no current flows through the 4 Ohm bridge, hence, this resistor can be removed without changing the resulting resistance. After this, it is easy to see that the equivalent resistance of the modified "diamond" is just 4 Ohms.
The remaining top parallel branch of the circuit will be 8 Ohms, and the bottom parallel branch is nominally 8 Ohms. The resulting resistance therefore is 4 Ohms.
(The answer is not 2 Ohms!)
Blue would bend the most, since it has a greater refractive index. It has more energy and a shorter wavelength, so it slows.
Answer:
This is an incomplete question. The complete question is --
An individual white LED (light-emitting diode) has an efficiency of 20% and uses 1.0 W of electric power.
How many LEDs must be combined into one light source to give a total of 3.8W of visible-light output (comparable to the light output of a 100W incandescent bulb)?
And the answer is --
19 LEDs
Explanation:
The full form of LED is Light emitting diode.
It is given that the efficiency of the LED bulb is 20 %
1 LED uses power = 1 W
So the output power of 1 LED = 0.2 W
We need to find the power required to give a 3.8 W light.
Power required for 3.8 W = Number of LEDs required = (total required power / power required for 1 LED )
= 3.8 / 0.2
= 19
Therefore, the number of LEDs required is 19.
You can describe the motion of an object by its position, speed, direction, and acceleration
Answer:
![T_C>T_B>T_A>T_D](https://tex.z-dn.net/?f=T_C%3ET_B%3ET_A%3ET_D)
Explanation:
Now we calculate the torque in each case:
A.
Given:
Force applied to the lever arm, ![F=5\ N](https://tex.z-dn.net/?f=F%3D5%5C%20N)
distance from the pivot, ![r=1\ m](https://tex.z-dn.net/?f=r%3D1%5C%20m)
angle of application, ![\theta=30^{\circ}](https://tex.z-dn.net/?f=%5Ctheta%3D30%5E%7B%5Ccirc%7D)
Torque:
![T_A=5\times 1\times sin\ 30^{\circ}](https://tex.z-dn.net/?f=T_A%3D5%5Ctimes%201%5Ctimes%20sin%5C%2030%5E%7B%5Ccirc%7D)
![T_A=2.5\ N.m](https://tex.z-dn.net/?f=T_A%3D2.5%5C%20N.m)
B.
Given:
mass moment of inertia of a disc, ![I=0.5\ kg.m^2](https://tex.z-dn.net/?f=I%3D0.5%5C%20kg.m%5E2)
acceleration of the disc, ![\alpha=10\ rad.s^{-2}](https://tex.z-dn.net/?f=%5Calpha%3D10%5C%20rad.s%5E%7B-2%7D)
Torque:
![T_B=I.\alpha](https://tex.z-dn.net/?f=T_B%3DI.%5Calpha)
![T_B=0.5\times 10](https://tex.z-dn.net/?f=T_B%3D0.5%5Ctimes%2010)
![T_B=5\ N.m](https://tex.z-dn.net/?f=T_B%3D5%5C%20N.m)
C.
force applied to the lever, ![F=10\ N](https://tex.z-dn.net/?f=F%3D10%5C%20N)
distance of lever arm, ![r=0.6\ m](https://tex.z-dn.net/?f=r%3D0.6%5C%20m)
angle of application of force, ![\theta = 90^{\circ}](https://tex.z-dn.net/?f=%5Ctheta%20%3D%2090%5E%7B%5Ccirc%7D)
Torque:
![T_C=F.r.sin\ \theta](https://tex.z-dn.net/?f=T_C%3DF.r.sin%5C%20%5Ctheta)
![T_C=10\times 0.6\times sin\ 90^{\circ}](https://tex.z-dn.net/?f=T_C%3D10%5Ctimes%200.6%5Ctimes%20sin%5C%2090%5E%7B%5Ccirc%7D)
![T_C=6\ N.m](https://tex.z-dn.net/?f=T_C%3D6%5C%20N.m)
D.
mass moment of inertia of a disc, ![I=1\ kg.m^2](https://tex.z-dn.net/?f=I%3D1%5C%20kg.m%5E2)
acceleration of the disc, ![\alpha=1\ rad.s^{-2}](https://tex.z-dn.net/?f=%5Calpha%3D1%5C%20rad.s%5E%7B-2%7D)
Torque:
![T_D=I.\alpha](https://tex.z-dn.net/?f=T_D%3DI.%5Calpha)
![T_D=1\times 1](https://tex.z-dn.net/?f=T_D%3D1%5Ctimes%201)
![T_D=1\ N.m](https://tex.z-dn.net/?f=T_D%3D1%5C%20N.m)