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Viktor [21]
3 years ago
12

A sample contains 10g of radioactive isotope. How much radioactive isotope will remain in the sample after 3 half-lives?

Physics
1 answer:
Ainat [17]3 years ago
3 0

Answer:

After 1 half-life (500 years), 500 g of the parent isotope will remain. After 2 half-lives (1000 years), 250 g of the parent isotope will remain. After 3 half-lives (1500 years), 125 g of the parent isotope will remain. After 4 half-lives (2000 years), 62.5 g of the parent isotope will remain.

Explanation:

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A hollow cylinder with an inner radius of 4.0 mm and an outer radius of 30 mm conducts a 3.0-Acurrent flowing parallel to the ax
Kryger [21]

Answer:

the magnitude of the magnetic field is 0.45 mT

Explanation:

Knowing the formula

B = \frac{m0* (i - i')}{2* Pi* r}

i = 3A    i' = 0A

B = \frac{4*3.1416e^{-7} * (3-0) }{2*3.1416*0.012}

B = 0.45 mT

8 0
3 years ago
Si las velocidades del viento y un avión tienen la
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Answer: Viendo que los aviones viajan muy raramente exactamente en la misma dirección que el para compensar continuamente tanto la dirección como la velocidad del vientoLos vientos en contra significa exactamente lo contrario; se necesita más combustible y el vuelo llevará más tiempo condiciones secas y húmedas, pero el piloto tiene la decisión final sobre si.

7 0
3 years ago
Steam at 0.6 MPa, 200 oC, enters an insulated nozzle with a velocity of 50 m/s. It leaves at a pressure of 0.15 MPa and a veloci
Rudiy27

Answer:

x2 = 0.99

Explanation:

from superheated water table

at pressure p1 = 0.6MPa and temperature 200 degree celcius

h1 = 2850.6 kJ/kg

From energy equation we have following relation

\dot m( h1+\frac{v1^2}{2}+ gz1 )+ Q = \dot m( h2+\frac{v2^2}{2}+ gz1) + W

\dot m( h1+\frac{v1^2}{2}) = \dot m( h2+\frac{v2^2}{2})

h1+\frac{v1^2}{2} = h2+\frac{v2^2}{2}

2850.6 + [\frac{50^2}{2} * \frac{1 kJ/kg}{1000 m^2/S^2}] = h2 +[ \frac{600^2}{2} * \frac{1 kJ/kg}{1000 m^2/S^2}]

h2 = 2671.85 kJ/kg

from superheated water table

at pressure p2 = 0.15MPa

specific enthalpy of fluid hf = 467.13 kJ/kg

enthalpy change hfg = 2226.0 kJ/kg

specific enthalpy of the saturated gas hg = 2693.1 kJ/kg

as it can be seen from above value hf>h2>hg, so phase 2 is two phase region. so we have

quality of steam x2

h2 = hf + x2(hfg)

2671.85 = 467.13 +x2*2226.0

x2 = 0.99

6 0
4 years ago
What is blood ? Name its components<br>​
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Plasma, red blood cells, white blood cells, and platelets.
3 0
3 years ago
A car of mass 1200Kilograms moving at 15 m/s the driver applies the brakes for 0.08 seconds and the castles down to 10 meter per
denpristay [2]
  • Initial velocity=u=15m/s
  • Final velocity=v=10m/s
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\\ \sf\longmapsto Acceleration=\dfrac{v-u}{t}

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\\ \sf\longmapsto Acceleration=-62.5m/s^2

5 0
3 years ago
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