Answer:
If the Moon has grown to twice it's size, the gravitational force of Earth on the Moon would be twice as much
Explanation:
The force of gravity between two objects is doubled if the mass of one of the objects is doubled.
If the Moon has grown to twice it's size, the gravitation force of Earth on the Moon would be twice as much, since the gravitational force is proportional to the masses of both the Earth and the Moon.
Released energy can be lost to the environment in heat form.
Answer:
C. Extreme heat and pressure from deep within the earth causes changes to rock's appearance, structure, and composition.
Explanation:
Metamorphic rocks are formed by the physical or chemical alteration by heat and pressure of an existing igneous rock or sedimentary rock into a denser form.
After the 1st half-life 250 g of the radioactive material will be left.
<span>After the 2nd half-life 125 g of the radioactive material will be left. </span>
<span>After the 3rd half-life 62.5 g of the radioactive material will be left. </span>
<span>Therefore after 60 minutes, 3 half lives would have occurred. </span>
<span>Therefore the half-life = 60 / 3 = 20 minutes when 250 grams of the original material would have remained radioactive. </span>
<span>Therefore the answer is A) About 250 gram of the material decayed in 20 minutes.</span>
