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Brut [27]
3 years ago
7

During the 1950s, nuclear bombs were tested on islands in the South Pacific. In one test, personnel on a nearby island received

10 mGy per hour of beta and gamma radiation. Part A At this rate, how long would it take to receive a potentially lethal dose equivalent of 4.5 Sv? Express your answer using two significant figures.

Physics
1 answer:
antiseptic1488 [7]3 years ago
6 0

Answer:

450hours.

Explanation:

In radiobiology, the relative biological effectiveness (RBE) is defined as the ratio of biological effectiveness of one type of ionizing radiation relative to another, given the same amount of absorbed energy.

For the step by step solution,

Dose Equivalent is

Sv = Dose in Gy x RBE

Note that RBE for both Gamma And Beta gamma is equal to 1.

Dose In Gy is ---

GY =4.5

Therefore the time taken (t) to receive 4.5Gy is

t = 4.5Gy/10Gy/h (Please go Through the attached files for continuation

The answer is= 450hours.

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A new event has been proposed for the Winter Olympics. An athlete will sprint 100 m, starting from rest, then leap onto a 20 kg
Mamont248 [21]

Answer:

3.5 m

Explanation:

Given

Mass of the bob sled , m_b = 20 kg

Mass of the girl, m = 40 kg

Speed of the girl, v = 12 m/s

Spring constant , k = 2000 N/m

Length of the ramp, L = 50 m

Angle of incline , θ = 20°

When the girl leaps on the sled , we use conservation of momentum principle

to find the speed of sled and the girl

m v + m_b (0) = (m + m_b) v_1

40 kg ×12 m/s = (20 kg + 40 kg ) v_1

v_1= 8 m/s

----------------------------------------------------------------------------

The height of the incline is ,

h = L sin 20 = 50 m  sin 20° = 17.1 m

By law of conservation of energy

(m + m_b) g h + 1/2 (m + m_b) v_1^2 = 1/2 (m +m_b) v2^2 + 1/2 k x^2

(60 kg ) ×9.8 m/s^2 ×17.1 m + 1/2 (60 kg ) (8 m/s)^2 = 1/2 (m +m_b)(0)^2 +1/2(2000 N/m) x^2

x = 3.5 m

Thus, the compression in the spring is 3.5 m

5 0
4 years ago
The second law of thermodynamics states that all energy transformations result in more disordered energy. How can photosynthesis
mars1129 [50]

Answer:

The addition of energy form the sun known as solar energy to the reaction in other to yield glucose.

Explanation:

The second law of thermodynamics states that all matter affected by energy are becoming more random. Indicting that there is a continuous increase in the entropy of the universe.  

In other words as a system loses energy to its surroundings. it becomes more random or experiences an increase in entropy

According to the second law of thermodynamics glucose would break down into CO₂ and H₂O under ordinary conditions, rather than fpr CO₂ to combine with H₂O to form glucose.

However due to the energy added through sunlight, the CO₂ and H₂Oare able to combine to form glucose.

7 0
3 years ago
How was the water filtered to remove debris and living organisms?
ira [324]

<span>The most common method in removing debris and living organisms is through a series of sedimentation and heat application. The role of sedimentation is to use gravity in separating drinkable water and visible debris. While treating water with heat kills the living organisms.</span>

5 0
4 years ago
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: A student of weight 678 N rides a steadily rotating Ferris wheel (the student sits upright). At the highest point, the magnitu
Ivenika [448]

Answer:

(a) 814N

(b) 132.7N

(c) 1223N

Explanation:

At the top and bottom the direction of the normal force is upwards. At the top the acceleration is negative while at the bottom the acceleration is positive. At the top the acceleration is directed downwards while at the bottom it is directed upwards.

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7 0
3 years ago
How does charging by conduction occur?
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C) A charged object touches a neutral object

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