Why is life difficult to define?
What will be an ideal response?
Life must be able to react, grow, reproduce, and evolve. However, these rules are not hard and fast; things that are not alive, such as stars, may satisfy several of these requirements. Viruses do most of these things but are not generally considered to be alive either.
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The Doppler technique for planet detection has found Earth-like planets around nearby Sun-like stars
Indicate whether the statement is true or false
Fermium-253 has a half-life of 3.00 days. A sample of fermium has 7.37 × 107 nuclei. How long will it take for there to be only 3.36 × 106 fermium nuclei in this sample?
A) 2.75 days B) 9.80 days C) 13.4 days D) 15.7 days E) 58.6 days
The event horizon
a. is believed to be a singularity. b. is a crystalline layer. c. has a radius equal to the Schwarzschild radius. d. marks the inner boundary of a planetary nebula. e. is located at the point where synchrotron radiation is created around a pulsar.
A 4.00 kg ball is moving at 3.00 m/s to the NORTH and a 5.00 kg ball is moving at 2.00 m/s to the NORTHWEST. The total momentum of the system is
A. 20.3 kg m/s at an angle of 89.7 degrees NORTH of EAST. B. 20.3 kg m/s at an angle of 24.6 degrees SOUTH of EAST. C. 26.1 kg m/s at an angle of 24.6 degrees NORTH of EAST. D. 26.1 kg m/s at an angle of 89.7 degrees SOUTH of EAST. E. 43.00 kg m/s at an angle of 45.0 degrees NORTH of EAST.