An object that absorbs all radiation falling on it, at all wavelengths, is called a black body. When a black body is at a uniform temperature, its emission has a characteristic frequency distribution that depends on the temperature. Its emission is called black-body radiation
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Answer: B. A gravitational field
Explanation:
Surrounding earth is gravitational field. Gravitational field is a region of space were gravitational force can be felt and gravitational force is the gravitational pull on the surface of the earth. The presence of this gravity is what allow us to be able to walk freely without falling. It also make us jump up and be able to land back on the ground. Assuming there are no force of gravity in the surface of the earth, there won't be any possibility of landing back on the ground after jumping.
Answer:
Newtons law of conservation energy says that energy cannot be created or destroyed because energy is always made into something else. It is always reused.
Explanation:
The weight of the ball including the air inside is 1.519 N
Explanation:
First of all, we calculate the volume of the ball, which is the volume of a sphere:
where
r = 21.6 cm = 0.216 m is the radius
Substituting,
Now we can calculate the mass of the air inside the ball, knowing that its density is
Its mass is
We also know that the mass of the ball is
m = 0.100 kg
So the total mass is
Finally we can calculate the weight:
where 
is the acceleration of gravity. Substituting,
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