Answer:
The problem occurs with all spherical mirrors.
Spherical mirrors are practical up to about inches in diameter.
Reflecting telescopes use spherical mirrors for apertures up to about 4 ".
Larger aperture telescopes use parabolic mirrors to obtain sharp focus.
Solution :
The given figure is a loop of a wire with a resistor.
When the switch S is closed for long time and is suddenly opened, the direction of the induced current can be find out by using the rule of right hand screw. According to the right hand screw rule, the direction of the magnetic field at the loop is in the direction that points outwards. The strength of the current rapidly decreases as it is switch off and the magnetic flux that is linked with the loop wire will also decrease.
According to the Lenz's law, the direction of the induced current must be such
the decrease in the magnetic flux. It means the direction of the magnetic field must be outwards and also normal to the plane of the screen. The direction of the induced anti clockwise or from right to left in the resistance.
<span>2.56 sec (t=1/0.39)
f=3.9/10</span>
Answer:
a) I = 0.363 kg*![m^{2}](https://tex.z-dn.net/?f=m%5E%7B2%7D)
b)
= 0.82385 kg*
Explanation:
a) If we approximate the skater how a cylinder his moment of inertia is:
I = ![\frac{mr^{2} }{2}](https://tex.z-dn.net/?f=%5Cfrac%7Bmr%5E%7B2%7D%20%7D%7B2%7D)
I = ![\frac{(60)(0.110)^{2} }{2}](https://tex.z-dn.net/?f=%5Cfrac%7B%2860%29%280.110%29%5E%7B2%7D%20%7D%7B2%7D)
I = 0.363 kg*![m^{2}](https://tex.z-dn.net/?f=m%5E%7B2%7D)
b) If the skater has his arms extended then:
![I_{T} = I_{B} + I_{A}](https://tex.z-dn.net/?f=I_%7BT%7D%20%3D%20I_%7BB%7D%20%2B%20I_%7BA%7D)
where
: Body’s moment of inertia
: Moment of inertia of the arms
= ![\frac{mr^{2} }{2}](https://tex.z-dn.net/?f=%5Cfrac%7Bmr%5E%7B2%7D%20%7D%7B2%7D)
=
= 0.3176 kg*![m^{2}](https://tex.z-dn.net/?f=m%5E%7B2%7D)
= 2 * ![\frac{mL^{2} }{12}](https://tex.z-dn.net/?f=%5Cfrac%7BmL%5E%7B2%7D%20%7D%7B12%7D)
= 2 *
= 0.50625 kg*
= 0.3176 + 0.50625 = 0.82385 kg*
The answer is 1000/20. Or that’s what I’m guessing. Lol