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Anton [14]
3 years ago
11

A sample of fluorine-18 in a laboratory has an initial mass of 50mg.flourine-18 has a half life of 1.8 hours Calculate the amoun

t of time it will take for the initial mass of fluorine-18 to be reduced from 59 mg to 12.5mg
Physics
1 answer:
Mekhanik [1.2K]3 years ago
7 0
It will take 3.6 hours to get reduced from 50 to 12.5 g..
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An astronaut travels to a star system 3.9 lyly away at a speed of 0.90 cc . Assume that the time needed to accelerate and decele
kakasveta [241]

Total time elapsed is =8.2y

The starting event is the astronaut leaving Earth. The finishing event is the astronaut arriving at the star system. The time between these events on Earth is:

Δt=3.9ly/0.9c

Δt=4.3y

For the astronaut, two events occur at the same position and can be measured with just one clock. Hence,

Δτ

=  \sqrt{1 -  \frac{v {}^{2} }{c {}^{2} }  }  \times Δt

Δτ

=  \sqrt{1 - ( \frac{0.9c}{c} ) {}^{2} }  \times (4.3y)

Δτ=1.8ly

The total elapsed time is:

T elapsed=Δt+3.9

T elapsed=4.3+3.9

T elapsed=8.2y

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4 0
1 year ago
1. The farthest star listed in the chart is? Arcturus, Capella, Aldebaran, Pollux, Regulus, Castor
Pachacha [2.7K]

Answer:

Regulus

Explanation:

Which is 77.63 light years away

8 0
2 years ago
How much power will be required to force a current of 4.13 amps to flow through a conductor whose resistance is 113 ohms? Use tw
-Dominant- [34]

The power required to force the current of 4.13 A to flow through the conductor is 1927.43 watts

<h3>What is power? </h3>

This is defined as the rate in which energy is consumed. Electrical power is expressed mathematically as:

Power (P) = square current (I²)× resistancet (R)

P = I²R

<h3>How to determine the power</h3>
  • Current (I) = 4.13 A
  • Resistance (R) = 113 ohms
  • Power (P) =?

P = I²R

P = 4.13² × 113

P = 1927.43 watts

Thus, the power required is 1927.43 watts

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7 0
1 year ago
Tommy runs around a track whose circumference is 400 meters. He runs a single lap in a time of 62 seconds. What is Tommy’s displ
bija089 [108]

Answer:

<h2>Angular Displacement 6.28 radians</h2>

Explanation:

for circular motion we are expected to solve for Angular Displacement it is measured in radian

Measurement of Angular Displacement.

we can measure it using the following relation

∅= s/r

where

s = the distance travelled by the body, and

r = radius of the circle along which it is moving.

given that

circumference c,  s= 400 m

r= ?

we have to solve for the radius

we know that circumference

c= 2\pi r

400= 2*3.142*r

400= 6.282*r

divide both sides by 6.284 we have

400/6.284

r= 63.63 m

Angular  displcament

∅= 400/63.63

∅= 6.28 radians

8 0
2 years ago
The newton is defined as the:
Orlov [11]

Answer:

b.

Explanation:

because of fhe speed an object when under the influence of earth gravitational field

tama po yan .

3 0
3 years ago
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