<span>#1. A car moving at the rate of 65 miles per hour passes a truck
moving in the same direction at 38 miles per hour.
The speed of the car from the truck's frame of reference is
27 miles per hour.
#2. The X-43 is the fastest aircraft ever. It flew a distance of 3,961 km
from Los Angeles to New York at the speed of 11,265 km/h.
It took the X-43 (3,961 km) / (11,265 km/h) = 0.352 hour, or 21min 5.8sec
to fly that distance?
#3. A mail carrier walked six blocks to the north one block to the east ,
and then six blocks to the south.
After these three moves, the mail carrier's displacement is one block
to the East.</span>
Answer:
rmax/rmin = √1.127
Explanation:
F = GmM / r²
As the masses can be assumed to be constant, the force between the two is proportional to the inverse of the square of the distance between them
(Fmax - Fmin) / Fmin = 0.127
(Fmax - Fmin) = 0.127Fmin
1/rmin² - 1/rmax² = 0.127(1/rmax²)
1/rmin² = 0.127(1/rmax²) + 1/rmax²
1/rmin² = 1.127(1/rmax²)
rmax²/rmin² = 1.127
rmax/rmin = √1.127 ≈ 1.06160256...
8.854 m/s is the speed of the box after it reaches bottom of the ramp.
<u>Explanation</u>:
From the figure we came to know that height of the block is 4 m.
We know that,
Total "initial energy of an object" = Total "final energy of an object
"
Total "initial energy of an object" is = "sum of potential energy" and "kinetic energy" of an object at its initial position.
Initial velocity is “0” as the object does not have starting speed
Total initial energy = 39.2 × m
Now, Total initial energy of an object = Total final energy of an object
Final speed is 8.854 m/s.
If a hot air balloon has shown rising above the top of a hill, the top of the hill is considered as a reference point.
<h2>
Reference Point:</h2>
It is a point that is used to standardize a experiment. The reference point is a constant point.
In the given problem:
- The hot air balloon is rising above the top of the hill. Here, the hill is a standard point that has a fixed (constant) height.
- Some other reference points are the top of the Eifel Tower or a famous shop which a person use to denote a certain distance.
Therefore, "If a hot air balloon has shown rising above the top of a hill" the top of the hill is considered as a reference point.
Learn more about Reference Point:
brainly.com/question/1674904
Closed
Explanation:
A physical system that is isolated from its environment is said to be a closed system.
In a closed system, energy can be exchange but matter cannot be exchanged.
- A closed system sightly permits the only certain types of exchange.
- These systems are usually used to control and limit the impact of the environment on a system.
- Experiments can be conducted on the premises of any the interactions.
Learn more:
Momentum of an isolated system brainly.com/question/7973509
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