Silver is best conductor with copper close behind.
best insulator depends on application. Teflon is best for very small currents, ceramic is probably best for high voltage, although a vacuum is also very good.
1. D:Asteroids have geological activity
2.A:Short-period comets circle around the sun in 200 years or less and originate in the Kuiper Belt
3.D:All of the above
4.A:It’s gravity is too weak to clear it’s orbit
5.B:Ceres
6.C:Haumea
7.A:Is bigger than Pluto
I hope this helps
Answer:
Observations:
- Large scale structures look about the same in all directions.
- The temperatures of the cosmic microwave background varies slightly with direction.
- The cosmic microwave background temperature is approximately 2.73 Kelvin.
- The Helium abundance is at least 25% in every galaxy studied so far.
While Inference includes:
- Photons of the cosmic microwave background is radiation left over from the Big bang.
- The cosmic microwave background is radiation left over from the Big bang.
- Fusion during the universe's first five minutes produced 75% hydrogen and 25% helium.
- Large-scale structure grew around density variations present in the early universe.
Explanation:
Inference here refers to the process of drawing a conclusion based on what is already known while Observation involves the perception and recording of data via the use of scientific instruments and procedures.
The insights below highlights the explanations for some of the insights used in determining its Observation or Inference status.
The Cosmic Microwave Background, which contains the afterglow of light and radiation is left over from the Big bang.
The Cosmic Microwave Background is black body radiation at a temperature of 2.725 Kelvin.
In the year 1965, a pair of radio astronomers named Arno Penzias and Bob Wilson respectively were working at Bell labs, in New Jersey. Using an antenna that is sensitive to the radiation of microwaves, they discovered an unknown source of static noise. After they tried doing everything possible to reduce the noise, they realized that the microwaves had a black body spectrum, with a characteristic temperature of only T = 2.725 Kelvin ( and maximum wavelength of 1 millimeter). These ever present microwaves seen in every direction are called "Cosmic Microwave Background". This explains the reason behind statement five(5) being an Observation.
Finally, The Cosmos Background Explorer (COBE) which launched a satellite in the year 1989 found that there were slight fluctuations in the radiation spectrum. The temperature varies very slightly from one place to another by a few parts in 100,000 i.e (10^-5). The excerpts above clarify the reason for the answer to statement four(4) being listed as an Observation.
Answer:
The slower runner is 1.71 km from the finish line when the fastest runner finishes the race.
Explanation:
Given;
the speed of the slower runner, u₁ = 11.8 km/hr
the speed of the fastest runner, u₂ = 15 km/hr
distance, d = 8 km
The time when the fastest runner finishes the race is given by;
The distance covered by the slower runner at this time is given by;
d₁ = u₁ x 0.533 hr
d₁ = 11.8 km/hr x 0.533 hr
d₁ = 6.29 km
Additional distance (x) the slower runner need to finish is given by;
6.29 km + x = 8km
x = 8 k m - 6.29 km
x = 1.71 km
Therefore, the slower runner is 1.71 km from the finish line when the fastest runner finishes the race.
