Which force is strongest within an atomic nucleus?
A) strong
B) weak
C) electromagnetic
D) gravity
E) They are all equal.
A
You might also like to view...
A radioactive nuclide of atomic number Z emits an electron, then the daughter nuclide emits a gamma ray. What is the atomic number of the resulting nuclide after both processes?
A) Z - 1 B) Z + 2 C) Z - 3 D) Z + 1 E) Z - 2
In a lead-shot tower, spherical 0.95-cm-diameter BB shots are formed by drops of molten lead which solidify as they descend in cooler air. At the terminal velocity, i.e., when the drag equals the gravitational force, estimate the total heat transfer coefficient if the lead surface is at 171°C, the surface of the lead has an emissivity of 0.63, and the air temperature is 16°C. Assume CD = 0.75 for the first trial calculation.
GIVEN
• Spherical lead-shot falling through the air at terminal velocity
• Shot diameter (D) = 0.95 cm = 0.0095 m
• Lead surface temperature (Ts) = 171°C = 494 K
• Lead surface emissivity (?) = 0.63
• Air temperature (T?) = 16°C 289 K
• Assume CD = 0.75 for the first trial calculation FIND
• The total average heat transfer coefficient (htotal). ASSUMPTIONS
• The surroundings act as a black body enclosure at T?
SKETCH
Describe the energy of a car driving up a hill
A) entirely kinetic B) entirely potential C) both kinetic and potential D) gravitational E) elastic
Which of the following sequences correctly describes the stages of life for a low-mass star?
A) protostar, red giant, main-sequence, white dwarf B) protostar, main-sequence, white dwarf, red giant C) white dwarf, main-sequence, red giant, protostar D) protostar, main-sequence, red giant, white dwarf E) red giant, protostar, main-sequence, white dwarf