Answer:
D
Explanation:
The source of the thermal energy in a combustion engine is the spark from the spark plug that ignites the fuel and air mixture converting chemical energy into thermal energy.
Answer:
Option B - Density increases
Explanation:
Density is defined as:
δ = mass / volume
When T°2 is > T°1, volume has been increased
As the volume increased, density has decreased.
↓δ = mass / volume ↑
In the situation above, temperature decreased from 4° to 0°.
The volume has been reduced, so the density has been increased.
↑ δ = mass / volume ↓
Answer:
September 9 at 9pm, the following year
Explanation:
We are given from the question above that;
=> Theo observers a star at 9:00 P.M. on September 9.
Theo will be able to see the exact star at the same position and at the exact time of night again the following year. This is because the stars move at least one degree everyday. Thus, the star will move 360 degree in a year. So, Theo will be able to see the same star by September 9 at 9pm, the following year.
Answer/Explanation:
The greenhouse effect is a natural process that warms the Earth's surface. When the Sun's energy reaches the Earth's atmosphere, some of it is reflected back to space and the rest is absorbed and re-radiated by greenhouse gases.
Earth's surface warms up in the sunlight. At night, Earth's surface cools, releasing heat back into the air. But some of the heat is trapped by the greenhouse gases in the atmosphere. That's what keeps our Earth a warm and cozy 58 degrees Fahrenheit (14 degrees Celsius), on average.
Answer:
solid
Explanation:
When a solid is melted, for example, thermal energy is what causes the bonds within the solid to break apart.