Answer:
B. Maria wrapped the ice cube tightly in cotton and aluminum foil.
Explanation:
According to this question, a class is performing an experiment to keep an ice cube solid for as long as possible. However, in the experimental procedure that will be used to actualize this aim, certain protocols must be duly observed to avoid error in the experiment.
Among the listed options containing actions taken by students, wrapping the ice cube tightly in cotton and aluminum foil is a likely source of error to the experiment. This is because aluminum, owing to its metallic properties, is a good conductor of heat. Hence, Aluminum foil will conduct heat and cause the ice cube to melt faster than normal.
This will jeopardize the aim of the experiment, which is to keep an ice cube solid for as long as possible.
Answer:32.83
Explanation:
Given
![T_H=91^{\circ}\approx 364 K](https://tex.z-dn.net/?f=T_H%3D91%5E%7B%5Ccirc%7D%5Capprox%20364%20K)
![T_L=17^{\circ}\approx 290 K](https://tex.z-dn.net/?f=T_L%3D17%5E%7B%5Ccirc%7D%5Capprox%20290%20K)
Q=46830 J
Total Entropy change of system
![\Delta s=-\frac{Q}{T_H}+\frac{Q}{T_L}](https://tex.z-dn.net/?f=%5CDelta%20s%3D-%5Cfrac%7BQ%7D%7BT_H%7D%2B%5Cfrac%7BQ%7D%7BT_L%7D)
![\Delta s=-\frac{46830}{364}+\frac{46830}{290}](https://tex.z-dn.net/?f=%5CDelta%20s%3D-%5Cfrac%7B46830%7D%7B364%7D%2B%5Cfrac%7B46830%7D%7B290%7D)
![\Delta s=-128.65 +161.48=32.83 J/K](https://tex.z-dn.net/?f=%5CDelta%20s%3D-128.65%20%2B161.48%3D32.83%20J%2FK)
Answer:
twelve facesFrom left to right the solids are tetrahedron (four sides), cube (six sides), octahedron (eight faces), dodecahedron (twelve faces), and icosahedron (twenty faces).
Explanation:
Ayo hope you enjoy
Astronomers thought that a nova was a new star, appearing for the first time in the heavens, today we know that it is as a binary star system.
<h3>What is the binary star system about?</h3>
A binary star system is known to be one where one star is known to be called a white dwarf and there is a mass that is said to be transferred to it
A binary star is known to be a kind of a system that is composed of two stars that are known to be gravitationally held together to and in orbit near each other.
Note that Binary stars in the night sky are ones that are often seen as a single object and thus Astronomers thought that a nova was a new star, appearing for the first time in the heavens, today we know that it is as a binary star system.
Learn more about astronomers from
brainly.com/question/1141458
#SPJ1
Answer:
C = 1256.63 miles
Explanation:
This problem is solved by using the following formula for the relation between the arc length of a circle and its radius:
![s=r\theta](https://tex.z-dn.net/?f=s%3Dr%5Ctheta)
s: arc length
r: radius
In this case "s" is 600 miles, and the angle of the arc length is 3°. With this information you can calculate the radius of the planet X:
![r=\frac{s}{\theta}=\frac{600miles}{3\°}}=200\ miles](https://tex.z-dn.net/?f=r%3D%5Cfrac%7Bs%7D%7B%5Ctheta%7D%3D%5Cfrac%7B600miles%7D%7B3%5C%C2%B0%7D%7D%3D200%5C%20miles)
With the value of the radius of the planet you can calculate the circumference, by using the following formula:
![C=2\pi r=2\pi (200\ miles)=1256.63\ miles](https://tex.z-dn.net/?f=C%3D2%5Cpi%20r%3D2%5Cpi%20%28200%5C%20miles%29%3D1256.63%5C%20miles)