Answer:
model is viable if the assumptions that answer it are in accordance with the fundamental principles or laws of physics and if it gives conclusions that can be tested with experiments.
Explanation:
A model in physics must be verified by experiments that are carried out to measure the consequences derived from it.
A model is viable if the assumptions that answer it are in accordance with the fundamental principles or laws of physics and if it gives conclusions that can be tested with experiments. Models that meet these conditions are said to be viable
X: No and Y: Sunlight Ingrid listed some important resources in a chart. Option D is correct.
<h3>What are fossil fuels?</h3>
Fossil fuels are obtained beneath the earth's crust which is formed due to buried plants and animals. the excessive heat under the earth's crust heats the plants and animals.
Fossil fuel took a long time to form it comes under the nonrenewable source of energy.
The use of fossil fuels such as coal, oil, and natural gas, and technical advancements in the contemporary age is driving the acceleration of change in human cultures today.
Ingrid listed some important resources in a chart is;
X: No
Y: Sunlight
Hence, option D is correct.
To learn more about the fossil fuel refer to the link;
brainly.com/question/2029072
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Answer:
r =
Explanation:
Let's apply the universal gravitation law to the body (c), we use the indications 1 for the planet and 2 for the moon
∑ F = 0
-F_{1c} + F_{2c} = 0
F_{1c} = F_{2c}
let's write the force equations
where d is the distance between the planet and the moon.
(d-r)² =
d² - 2rd + r² = \frac{m}{M} \ \ r^2
d² - 2rd + r² (1 - ) = 0
(1 - ) r² - 2d r + d² = 0
we solve the second degree equation
r = [2d ± ] / 2 (1- )
r = [2d ± 2d ] / 2d (1- )
r =
there are two points for which the gravitational force is zero
A soundwave will go through a medium but once it goes through, the sound that you hear is muffled or not as clear usually just like sound going through a wall. The soundwaves will be something like moved and the sound you hear might not be the same or as clear as the original sound was