Which is NOT a critical factor that determines the habitability of a rocky planet?
A) size
B) distance from parent star
C) presence of a magnetic field
D) presence of an atmosphere
C
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Find the minimum diameter of a steel wire 18 m long that will stretch no more than 9 mm when a load of 380 kg is hung on the lower end. (Y steel = 2.0 × 1011 N/m2)
What will be an ideal response?
What is the mass of a string that is 17 cm long and has a fundamental frequency of 792 Hz when under a tension of 1.7 kN?
A. 64 g B. 16 g C. 1.6 g D. 32 g E. 6.4 g F. 3.2 g
What is meant by the idea life on Earth had an "interstellar origin"?
What will be an ideal response?
As an electromagnetic wave travels through free space, its speed can be increased by:
a. increasing its frequency. b. increasing its energy only. c. increasing both its energy and momentum. d. None of the above will increase its speed.