Because a liquid can take the wheight of the hydraulic press while a gas could combust under pressure.
Answer:
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Explanation:
Answer:
a = 0.827468
Explanation:
given,
half life of radium-224 = 3.66 days
now,
t is the time
A₀ is the amount at t = 0
at t = 0 , A(0) = 1
A(3.66) = 1/2
at t = 3.66
taking log both side
3.66 log (a) = log (0.5)
log a = -0.0822
now,
a = 0.827468
Answer:
The smallest amount of lead that needs to be attached to John's boat in order to sink it has to have a mass slightly greater than the mass of the boat.
Explanation:
A body floats in a fluid when its density is less than the density of the fluid.
The body sinks when its density is more than the density of the fluid.
Density of the pond = density of pure water = 1 g/cm³
Specific gravity of an object = (density of object)/(density of water)
0.5 = (density of John's boat)/1
Density of the John's boat = 0.5 g/cm³
And density is given as
Density = (mass/volume)
0.5 = (mass of John's boat)/(volume of John's boat)
Let the volume of John's boat be v and the mass of John's boat be m
0.5 = (m/v)
v = (m/0.5) = 2m
To sink the boat, we need the total mass on the boat to increase the density to a value greater than 1.
Let the minimum mass of lead required for this to be M
The volume of the boat remains the same, but the total mass on the boat is now (m+M)
1 < (m + M)/v
M + m > v
Recall, v = 2m
M + m > 2m
M > 2m - m
M > m
Hence, the smallest amount of lead that needs to be attached to John's boat in order to sink it has to have a mass slightly greater than the mass of the boat.
Hope this Helps!!!!
