A straight wire is carrying a current of 2.0 A. It is placed at an angle of 60° with respect to a magnetic field of strength 0.20 T. If the wire experiences a force of 0.40 N, what is the length of the wire?
A) 1.0 m
B) 1.2 m
C) 1.4 m
D) 1.6 m
E) 1.8 m
B
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The carbon-nitrogen-oxygen (CNO) cycle works best in temperatures:
A) lower than 10,000,000 K. B) higher than 16,000,000 K. C) higher than 11,000,000 K but lower than 12,000,000 K D) higher than 13,000,000 K but lower than 15,000,000 K
Which planet is most similar in size and mass to Earth?
A) Mercury B) Venus C) Mars D) Jupiter E) Neptune
What factors are important when trying to classify a spiral galaxy?
a. amount of dust and gas in the galaxy b. structure of the spiral arms c. size of the central region d. All of the other choices are important.
A nonuniform 2.0-kg rod is 2.0 m long. The rod is mounted to rotate freely about a horizontal axis perpendicular to the rod that passes through one end of the rod. The rotational inertia of the rod about this axis is 4.0 kg?m2. The center of mass of the rod is 1.2 m from the axis. If the rod is released from rest in the horizontal position, what is its angular speed as it swings through the vertical position?
A. 3.4 rad/s B. 4.4 rad/s C. 4.3 rad/s D. 5.8 rad/s E. 6.8 rad/s