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VMariaS [17]
3 years ago
15

#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 . What is the

speed of the car to the nearest mile per hour from the truck frame of reference ?
#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 . How long did it take the x-43 to fly that distance?


#3. A mail carrier walked six blocked to the north one block to the east , and then six blocks to the south. What is the mail carriers displacement ?
Physics
1 answer:
valentina_108 [34]3 years ago
8 0
<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>
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A machinist needs to remove a tight fitting pin of material A from a hole in a block made of material B. The machinist heats bot
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Answer:

The coefficient of thermal expansion of material B is more than A

Explanation:

As we know that when we apply heat to a material it expands. The amount of expansion depends on the nature of the material. The amount of expansion depends on the coefficient of thermal expansion of the material.

If a material has high value of thermal expansion coefficient then it expands more.

here material A expands less and material B expands more because the pin which is made by material A becomes loosen, so the coefficient of thermal expansion of B is more than the coefficient of thermal expansion of A

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