Calories of the food type are equal to which of the following?
a. 4.186 J
b. 4 186 J
c. 1 BTU
d. 1054 J
b
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The Helix and Egg nebulae which originated from (what are today) white dwarf stars are
a. supernova remnants. b. planetary nebulae. c. the result of uranium detonation. d. the result of the collapse of the iron core of each star. e. nebulae associated with protostars.
An ice skater glides across a frozen pond at a constant velocity. What is the net force acting on the skater?
A. more than her weight B. equal to her weight C. less than her weight but more than zero D. depends on her speed E. zero
Light strikes a diamond (n = 2.42) at an angle of 60° relative to the normal to the surface. What is the angle of refraction?
A. 21° B. 30° C. 38° D. 69° E. 71°
One 20-year-old twin brother takes a space trip with a speed of 0.80c for 30 years according to a clock on his spaceship. At the end of this trip, what are (a) his own age and (b) the age of his Earth-based twin brother?
A) (a) 20 y (b) 30 y B) (a) 30 y (b) 50 y C) (a) 50 y (b) 70 y D) (a) 70 y (b) 90 y