Answer:
This is due to difference in bandwidths of different stations, and the inability of the bunny ear to accommodate distant bandwidths most times at the same time.
Explanation:
Bunny ears are a simple half-wave dipole antenna used to receive VHF television bands. It is constructed of two telescoping rods attached to a base, these rods extend out to about 1 meter length, and are collapsible when not in use. For the best reception the rods should be adjusted to be a little less than 1/4 wavelength at the frequency of the television channel being received and bandwidth of different station differs one frone another, so adjustment has to be made sometimes in order to get reception from other stations. Thankfully, the dipole has a wide bandwidth, so most times, adequate reception is achieved without having to adjust the length of the bunny ear.
The half wave dipole of a bunny ear has a low gain of about 2.14 dBi; which means it is not as directional and sensitive to distant stations as a large rooftop antenna, but its wide angle reception pattern may allow it to receive several stations located in different directions without requiring readjustment when the channel is changed. Sometime an adjustment of the rods is necessary.
Answer: A sealed calorimeter is a closed system because thermal energy is not transferred to the environment.
A closed system is an isolated system where there is no transfer of energy with its surroundings. Also the system is not subjected to any external force whose source is external to the system.
Answer: Yes it is indeed
Explanation: I understand cuz school is like a prison lol
The mass of a star causes gravitational pull inwards. The fusion of hydrogen to helium create temperature and pressure which pushes outwards, so basically the forces of gravity and pressure. Possibly nuclear fusion.
Answer:
a) 1/4 what it is now
Explanation:
As we know that force of gravitation between two planets at some distance "r" from each other is given as
![F_g = \frac{Gm_1m_2}{r^2}](https://tex.z-dn.net/?f=F_g%20%3D%20%5Cfrac%7BGm_1m_2%7D%7Br%5E2%7D)
now since we know that if the distance between Earth and Sun is changed
So the force of gravity will be given as
![\frac{F_g'}{F_g} = \frac{r_1^2}{r_2^2}](https://tex.z-dn.net/?f=%5Cfrac%7BF_g%27%7D%7BF_g%7D%20%3D%20%5Cfrac%7Br_1%5E2%7D%7Br_2%5E2%7D)
now we know that the distance between sun and earth is changed to twice the initial distance between them
so we have
![r_2 = 2r_1](https://tex.z-dn.net/?f=r_2%20%3D%202r_1)
so new gravitational force between sun and earth is given as
![F_g' = \frac{r_1^2}{(2r_1)^2}F_g](https://tex.z-dn.net/?f=F_g%27%20%3D%20%5Cfrac%7Br_1%5E2%7D%7B%282r_1%29%5E2%7DF_g)
![F_g' = \frac{1}{4}F_g](https://tex.z-dn.net/?f=F_g%27%20%3D%20%5Cfrac%7B1%7D%7B4%7DF_g)