Neptunium. In the fall of 2002, scientists at Los Alamos National Laboratory determined that the critical mass of neptunium-237 is about 60 kg. The critical mass of a fissionable material is the minimum amount that must be brought together to start a nuclear chain reaction. Neptunium-237 has a density of 19.5 g/cm 3 . What would be the radius of a sphere of this material that has a critical mass?
Neptunium. In the fall of 2002, scientists at Los Alamos National Laboratory determined that the critical mass of neptunium-237 is about 60 kg. The critical mass of a fissionable material is the minimum amount that must be brought together to start a nuclear chain reaction. Neptunium-237 has a density of 19.5 g/cm 3 . What would be the radius of a sphere of this material that has a critical mass?
Neptunium. In the fall of 2002, scientists at Los Alamos National Laboratory determined that the critical mass of neptunium-237 is about 60 kg. The critical mass of a fissionable material is the minimum amount that must be brought together to start a nuclear chain reaction. Neptunium-237 has a density of 19.5 g/cm3. What would be the radius of a sphere of this material that has a critical mass?
One cubic centimeter (1.0 cm3) of water has a mass of 1.0 ✕ 10−3 kg.
(a) Determine the mass of 1 m3 of water. kg?(b) Assuming biological substances are 100% water, estimate the mass of a (spherical) cell with a diameter of 1.0 µm. kg?(c) Assuming biological substances are 100% water, estimate the mass of a human kidney. Take a kidney to be roughly a sphere with a radius of 4 cm. kg?(d) Assuming biological substances are 100% water, estimate the mass of a fly. Take a fly to be roughly a cylinder 4 mm long and 2 mm in diameter. kg?
1. The ________ of substance is the number of times it is denser than water
a) mass
b) specific gravity
c) density
d) flotation
2.A cube of side 3 cm is placed in a graduated measuring cylinder. 125 cm' of water is then added and the cube remains at the bottom of the cylinder. What will be the reading on the measuring cylinder?
a) 128 cm3
b) 131 cm3
c) 134 cm3
d) 152 cm3
3. The density of a substance P is 0.8 times the density of water. Which of the following statements is are true?
I. The relative density of Pis 0.8 kg/m3
II. P will float in water
III. If a given volume of water is of mass 5 kg, an equal volume of P will have a mass of 4 kg
a) I only
b) I and Il only
c) II and Ill only
d) I,II and III
4. The upthrust experienced by a solid immersed in a liquid is equal to the
a) mass of the solid
b) weight of the liquid displaced
C) volume of the liquid displaced
D) density of the liquid
Grains of fine California beach sand are approximately spheres with an average radius of 50 m and are made of silicon dioxide, which has a density of 2600 kg/m3.What mass of sand grains would have a total surface area (the total area of all the individual spheres) equal to the surface area of a cube 1.00 m on an edge?
Chapter 1 Solutions
University Physics, Volume 2 - Technology Update Custom Edition for Texas A&M - College Station, 2/e
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