The half life of uranium-232 is 70 years. The time for 3/4 of a sample of uranium-232 to decay is
a. 35 years
b. 70 years
c. 125 years
d. 140 years
e. none of the above
D
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A car travels at a steady 40.0 m/s around a horizontal curve of radius 200 m. What is the minimum coefficient of static friction between the road and the car's tires that will allow the car to travel at this speed without sliding?
A) 1.23 B) 0.816 C) 0.736 D) 0.952 E) 0.662
__________is the process by which an atmosphere traps heat and raises the temperature of a planetary surface
A) The greenhouse effect B) Global warming C) Differentiation D) The Tyndall effect
Why don't all supernova remnants contain pulsars?
a. All supernova remnants do contain pulsars. b. Some supernova explosions form white dwarfs instead of the neutron stars necessary for pulsars. c. Pulsars slow down and quite producing the pulses before the supernova remnant dissipates. d. The pulsar may be tipped so that the beams do not sweep past Earth. e. b and c above.
When temperature goes up, BOD goes up
What will be an ideal response?