In the context of giant stars, helium fusion produces _____ that accumulate in an inert core
A) nitrogen and carbon
B) hydrogen and neon
C) oxygen and neon
D) carbon and oxygen
D
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What is a mutation?
A) a change in a living cell's DNA B) a change in an organism that turns it into a different species C) a change in the type of food an organism consumes D) a change in the physical appearance of a living organism
Using the information estimate the ambient air temperature that could cause frostbite on a calm day on the ski slopes.
GIVEN
• Skier’s skin of thickness (L) = 3 mm = 0.003 m exposed to cold air
• Inner surface temperature of skin (Tsi) = 35°C
• Thermal conductivity of skin (k) = 0.35 W/(m K)
• Convective heat transfer coefficient in still air ( ch ) = 20 W/(m2 K)
• Frostbite occurs at an outer skin surface temperature (Tso) = 10°C FIND
• The ambient air temperature (T?) that could cause frostbite ASSUMPTIONS
• Steady state conditions prevail
• One dimensional conduction occurs through the skin
• Radiative loss (or gain from sunshine) is negligible
SKETCH
A positive charge and a negative charge held a certain distance apart are released. As they move, the force on each particle
A) increases. B) decreases. C) stays the same.
The distance between the object and the eyepiece of a compound microscope is 25.0 cm. The focal length of its objective lens is 0.200 cm and the eyepiece has a focal length of 2.60 cm. A person with a near point of 25
0 cm and a far point at infinity is using the microscope. (a) What is the angular magnification obtainable using the eyepiece alone as a magnifying lens if the final image is at the person's far point? (b) What is the total magnification of the microscope when used by the person of normal eyesight?