Answer:
B. Globular clusters
are scattered throughout the galactic halo that surrounds the Milky Way.
Explanation:
Answer:
.c. −160°C
Explanation:
In the whole process one kg of water at 0°C loses heat to form one kg of ice and heat lost by them is taken up by ice at −160°C . Now see whether heat lost is equal to heat gained or not.
heat lost by 1 kg of water at 0°C
= mass x latent heat
= 1 x 80000 cals
= 80000 cals
heat gained by ice at −160°C to form ice at 0°C
= mass x specific heat of ice x rise in temperature
= 1 x .5 x 1000 x 160
= 80000 cals
so , heat lost = heat gained.
Answer:
Laika
Explanation:
The dog's name was originally Kudryavka, or Little Curly, but she became known internationally as Laika, a Russian word for several breeds of dog similar to a husky. American reporters dubbed her Muttnik as a pun on Sputnik. Unfortunately, Laika's trip into space was one-way only.
None of the choices is correct.
== The Earth's radius is 6,371 km. That's how far you are from the center of the Earth when you're on the ground.
== The acceleration of gravity on the ground is 9.8 m/s² .
== The acceleration of gravity varies inversely as the square of the distance from the center of the Earth. So, at 7,200 km from the center, it's
(9.8 m/s²) · (6371km/7200km)² .
Stuffing this through your cakulator, you'll get <em>7.67 m/s²</em> .
