__________ radiation causes your skin to tan
Fill in the blank(s) with correct word
Ultraviolet
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According to conservative estimates, the end of habitability of Earth will come about
A) 3 to 4 billion years from now B) a few hundred thousand years from now C) 100 million years from now D) a billion years from now
Which has the smaller critical mass; U-235 that releases 2.5 neutrons per fission, or Pu-239 that releases 2.7 neutrons per fission?
A) U-235 B) Pu-239 C) both would have the same critical mass.
What is the intensity level of a sound with intensity of 6.0 × 10^?10 W/m2? ( I0 = 10?12 W/m2 )
a. 20 dB b. 64 dB c. 2.8 dB d. 28 dB e. 6.4 dB
A car travels in a flat circle of radius R. At a certain instant the velocity of the car is 24 m/s west, and the acceleration of the car has components of 2.4 m/s2 east and 1.8 m/s2 south. What is the radius of the circle?
a. 0.24 km b. 0.19 km c. 0.32 km d. 0.14 km e. 0.27 km