Answer:
1a) Chemical inertness
1b) transparency
2) extremely less brittle
3) they can melt very easily under moderate heat.
4) they have low melting point
5) metals are hard, meaning they can easily injure a baby. Metals are good absorbers and radiators of heat.
6) they are less hard when compared to metals so they are less probable to cause injuries to kids.
7) material with very low density.
2)An internal combustion engine doesn't have a cylinder and a piston.
3)The burning of fuel occurs inside the cylinder with the piston in an internal combustion engine.
4)An external combustion engine doesn't have a cylinder and a piston
Answer: The correct answer is option (3).
Explanation:
Internal combustion engine: An engine which generates motive power by burning the fuel with air inside the engine. Heat produced is used to move piston or to perform other work as they expand.
External combustion engine : An engine where motive power is generated by providing the heat to the fluid present inside the engine from the external source. Here combustion of the fuel is not inside the engine.
Hence,the correct answer is option (3).
The answer is 3) The burning of fuel occurs inside the cylinder with the piston in an internal combustion engine.
Explanation: I took the test :)
B) Kingdom
C) Order
D) Phylum
Answer: Phylum
Explanation:
A notochord can be defined as the beginning to the backbone which is primitive. It appears in the embryos as a flexible rod which is made from the germ layer called as mesoderm.
It is one of the 3 layers that is found in the body. These layers are ectoderm, endoderm and mesoderm.
Notochords are only found in the phylum chordata. This phylum belongs a group of animals which includes human.
Answer:
The correct answer is option b, that is, when the Sun, Earth, and the moon are nearly in a line.
Explanation:
The low and high tides are caused by the moon. The gravitational force of the moon produces something known as the tidal force. This force makes the Earth and its water to bulge out on the side nearest to the moon and the side far away from the moon. These bulges of water are considered as high tides.
Similarly to the moon, the Sun also causes tides, but, they are smaller in comparison. However, when the Earth, moon, and the Sun line up, that is, which takes place during the new moon or the full moon, the solar and lunar tides reinforce each other, resulting in more extreme tides, known as spring tides. The spring tides are considered as the highest tides.
0.23 mol
Ob
0.38 mol
0.28 mol
Od
0.47 mol
Answer:
0.23 mol
Explanation:
Answer:
The reason is that there are radioactive elements that are in the center of the earth.
Explanation:
If the earth were only a rock cooling from the time of its birth. It should have already cooled completely thousands of years ago. However, volcanoes continue to shed hot magma and this is proof that there is a source of heat in the center of the earth. This source of heat is due to the radioactivity of elements such as Uranium and Thorium that were enclosed during the formation of the earth. These elements slowly disintegrate emitting particles that collide with others emanating heat. For example, the half-life of uranium is 4.5 billion years, which means that it decays very slowly.