The magnetic field lines generated by a bar magnet
A) are external only.
B) are both external and internal to the magnet.
C) follow an inverse-square law.
D) none of the above
Answer: B
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An airplane is flying in horizontal flight at a constant velocity. The weight of the airplane is 40,000 N. The wings produce a lift force that is perpendicular to the wings and a drag force that is parallel to the wing. The engine produces a forward thrust force of 2,000 N. Which of the following statements is true?
A. the net force on the airplane is zero B. the net force on the airplane is forward C. the net force on the airplane is upward D. the net force on the airplane is downward E. the net force on the airplane is backward
Suppose Venus rotated as fast as Earth. How would this change its relative levels of volcanism, tectonics, and erosion?
a. All would remain the same—they are independent of rotationz b. All three would be higher. c. All three would be lower. d. Levels of volcanism and tectonics would stay the same, but erosion levels would be higher. e. Levels of volcanism and tectonics would be higher, and erosion levels would stay the same.
A 2000-kg sailboat experiences an eastward force of 3000 N by the ocean tide and a wind force against its sails of magnitude 6000 N directed toward the northwest (45° N of W). What is the magnitude and direction of the resultant acceleration?
Which of the following expresses a principle which was initially stated by Galileo and was later incorporated into Newton's laws of motion?
a. An object's acceleration is inversely proportional to its mass. b. For every action there is an equal but opposite reaction. c. The natural condition for a moving object is to remain in motion. d. The natural condition for a moving object is to come to rest.