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Mandarinka [93]
3 years ago
5

An aerobatic airplane pilot experiences weightlessness as she passes over the top of a loop-the-loop maneuver. the acceleration

of gravity is 9.8 m/s 2 . if her speed is 430 m/s at this time, find the radius of the loop. answer in units of km.
Physics
1 answer:
Yanka [14]3 years ago
6 0
The acceleration due to gravity serves as the centripetal acceleration of the objects that orbits the Earth. The centripetal acceleration due to gravity is calculated through the equation,

    a = v²/r

where v is the speed and r is the radius. Substituting the known values to the equation,

   9.8 m/s² = (420 m/s)² / r

The value of r from the equation is 18000 m or equal to 18 km.

<em>Answer: 18 km</em>
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Which of the following would reduce the resistance of a metal wire?
Vlad [161]
1 ) a) increasing its thickness

2) c)potential difference
8 0
3 years ago
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. Maria walked 1.5 miles south to her house in 0.5 hours. What is her speed in miles per hour?
Simora [160]

1) 3 miles/Hour

The speed is defined as the distance covered divided by the time taken:

v=\frac{d}{t}

where

d = 1.5 mi is the distance

t = 0.5 h is the time taken

Substituting,

v=\frac{1.5}{0.5}=3 mi/h

2) 1.34 m/s south

Velocity, instead, is a vector, so it has both a magnitude and a direction. We have:

d=1.5 mi \cdot 1609 m/mi = 2414 m is the displacement in meters

t=0.5 h \cdot 3600 s/h =1800 s is the time taken in seconds

Substituting,

v=\frac{2414 m}{1800 s}=1.34 m/s

And the direction of the velocity is the same as the displacement, so it is south.

6 0
4 years ago
A student is studying the fossils of a plant species that lived several million years ago. The fossils of this species are found
tresset_1 [31]

B. Australia and Antarctica were a single landmass in the past.

Explanation:

The most likely explanation for why the fossils of this plant are found on these two continents is that Australia and Antarctica were a single landmass in the past.

This evidence is vastly supported by the theory of plate tectonics originally, the theory of continental drift.

  • Plate tectonics proposes that all land masses were once joined together as a single supercontinent called Pangaea.
  • The region of Antartica and Australia were once joined as a single continental mass.
  • The plant must have developed together at that time.
  • When the continents moved apart, they still had the fossils.

learn more:

Continental drift brainly.com/question/5002949

#learnwithBrainly

6 0
4 years ago
Consider a 24.0 V storage battery that can transfer, over the course of its useful lifetime, a total charge equivalent to 340000
xeze [42]

Answer:

Explanation:

Given that,

Potential difference of battery is

V = 24V

Total charge battery can transferred

q = 340,000C

Work done by the battery?

Work done is given as

W = qV

Where q is charge in Columbs

V is potential difference in Volts

Then, W = qV

W = 340,000×24

W = 8,160,000 J

Work done by the battery over it's useful life time is 8,160,000J

5 0
3 years ago
No wrong answers please
zepelin [54]
Sorry i can’t help sorry good luck tho!!!!
4 0
4 years ago
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