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marta [7]
3 years ago
8

Radio waves heading upward from Earth often bounce off the

Physics
2 answers:
romanna [79]3 years ago
8 0
The answer is D check and see
charle [14.2K]3 years ago
7 0

Answer:

Radio waves heading upward from Earth often bounce off the thermosphere-D.

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The lowest point in the state of Louisiana is New Orleans. The city’s elevation is 8 feet below sea level. Write the elevation o
Alex Ar [27]

Answer:

-8

Explanation:

sea level is another way of saying zero. If something is above or above sea level it is a positive integer. like a regular number. if something is below sea level it is a negative integer like negative numbers. They said 8 is the elevation but new orleans is BELOW sea level. that means the integer we are looking for is going to be a negative number. 8 is the number they told us and since it is below the sea level. The integer of new orleans that represents its elevation is -8.

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4 years ago
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Which has the greater acceleration
Alik [6]
Answer: Object B

The velocity of object A is depicted in the graph as a straight line (constant speed therefore no acceleration).
The graph indicates that the velocity of object B increases (the object is accelerating).
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3 years ago
Which of the following is an example of work?
EastWind [94]

Answer:

it's D

Explanation:

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4 years ago
A mass movement that involves the sudden movement of a block of material is called a
Margarita [4]
A mass movement that involves the sudden movement of a block of material is called a B.slide.

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7 0
3 years ago
9. Carlos jumps out of a hovering helicopter. After he opens his parachute, his acceleration due to gravity decreases
nata0808 [166]

Answer:

A The force of air resistance becomes equal in magnitude to his weight.

Explanation:

When Carlos jumped out of the helicopter, he fell with a downward force which is proportional to his weight.

His weight is the product of his mass and acceleration due to gravity.

When the parachute is deployed, air resistance between the air molecules and the surface area of the parachute generates a drag force, which acts upwards.

If the drag forces exceeds his weight, then his net force will be directed upwards.

If his weight exceeds the drag forces, then the net force on his body will be downwards.

In the case that his drag force, and his weight are equal, there will be a zero net force on him, and he will experience no acceleration.

So, if after he opens his parachute, his acceleration due to gravity decreases  to zero, then we can say that this is because  the force of air resistance (drag) becomes equal in magnitude to his weight.

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4 years ago
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