The paths of the light waves that interfere to cause first-order lines (2 points) Group of answer choices differ in length by th
1 answer:
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Answer:
Explanation:
In order to solve this problem, we must first do a drawing of the situation (see attached picture).
When the brakes of the car were applied, we can see that there was only one horizontal force affecting the vehicle's movement, which was the force of friction. When analyzing the free body diagram we can apply Newton's laws to determine the equations we will use to solve this.
so:
-f=ma
we also know that:
so
we can now solve for the acceleration, so we get:
we don't know what the normal force is, so we can find it out by analyzing the vertical forces applied to the car:
so we get:
N-W=0
which means that:
N=W
we also know that:
W=mg
so
N=mg
we can substitute this into the first equation so we get:
which simplifies to:
we can now substitute the provided data:
which yields:
once we got the acceleration, we can use kinematics formulas to solve this, we got the following formula:
we know the final velocity must be zero, since that's where the car got to a stop, so the formula then becomes:
we can now solve for the initial velocity, which yields:
so we can now substitute the daa we know, so we get:
so we get:
So from this we know that the velocity of the car must have been of at least 29.68m/s when the brakes were applied.
The question is incomplete. The complete question is :
If the entire population of Earth were transferred to the Moon, how far would the center of mass of the Earth-Moon population system move? Assume the population is 7 billion, the average human has a mass of 65 kg, and that the population is evenly distributed over both the Earth and the Moon. The mass of the Earth is 5.97×1024 kg and that of the Moon is 7.34×1022 kg. The radius of the Moon’s orbit is about 3.84×105 m.
Solution :
Given :
Mass of earth,
Mass of moon,
Mass of each human,
Therefore mass of total population,
Let the earth is at the origin of the coordinate system. Then,
Since
Hence if we shift all the population on the moon there will be negligible change in the mass of the moon and earth. Hence there will not be any significant shift on the centre of mass. i.e.
from the earth.