Answer:
look at the explanation
Explanation:
This pith-ball electroscope is used to detect the presence of a static electricity charge. The two lightweight “pith” balls suspended from the strings are attracted to objects with a static electric charge. The pith balls can also be charged by touching them to an object with a static electric charge.
Physical anthropology studies the human body. This discipline is aimed at analyzing the evolution and diversity of human beings.
<h3>What is physical anthropology?</h3>
Physical anthropology is a branch of anthropology that studies the evolution and diversity of human beings.
Physical anthropology is also called biological anthropology due to its close relation with biological sciences.
This branch of anthropology (physical anthropology) is aimed at assessing the evolution and physical variation and/or behaviors of human beings.
Learn more about physical anthropology here:
brainly.com/question/8311728
Answer:
In the water cycle, evaporation occurs when sunlight warms the surface of the water. The heat from the sun makes the water molecules move faster and faster, until they move so fast they escape as a gas. Once evaporated, a molecule of water vapor spends about ten days in the air.
Explanation:
Answer:
Explanation:
a. Given that:
mass of first & second piece, 
mass of 3rd piece,
-velocity of first piece(
) and 
as velocity of 2nd piece (
)
Let 
be velocity of 3rd piece=?
#Vessel is at rest before explosion. Considering conservation of linear momentum:
#Dividing both sides by 
#Plug the
values:
#So the magnitude of the third piece is:
Magnitude of the 3rd piece is 10.84 m/s
b. To find direction of the magnitude (as an angle relative to the 
-axis), we find 
. The angle is obtained by getting the tan inverse as:
-The direction of the magnitude (angle relative to the x-axis) is 45°
Answer: 9.9%
Explanation: efficiency = (work output /work input) × 100
Note that, 1 kilocalorie = 4184 joules, hence 22kcal = 22× 4184 = 92048 joules.
Work output = 9200 j and work input = 92048 j
Efficiency = (9200/92048) × 100 = 0.099 × 100 = 9.9%
