The first self-replicating molecule was probably
A) a simple carbohydrate
B) DNA
C) a simple protein
D) RNA
D
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A uniform rod (mass = 2.0 kg, length = 0.60 m) is free to rotate about a frictionless pivot at one end. The rod is released from rest in the horizontal position. What is the magnitude of the angular acceleration of the rod at the instant it is 60° below the horizontal?
a. 15 rad/s2 b. 12 rad/s2 c. 18 rad/s2 d. 29 rad/s2 e. 23 rad/s2
A.A B.B C.C D.D E. Toward the viewer F. Away from the viewer T. The field is zero.
Sound of frequency 600 Hz is emitted by a point source. The sound can travel along two different paths to reach an observer
What is the minimum non-zero path length difference that results in constructive interference? Assume the speed of sound in air is 340 m/s. A) 28.3 cm B) 1.13 m C) 1.76 m D) 88.2 cm E) 56.7 cm
A charged particle of mass 1.0 x 10-26 kg enters a region of magnetic field at a speed of 
at an angle of 37 degrees relative to the magnetic field direction. If the magnetic field strength is 1.2 T and the charge of the particle is +e, what will be the radius of the helical path it takes?
A. insufficient information given. B. 15 cm C. 11 cm D. 8.9 cm