Click the fourth tab (labeled "Computer Models"), then explore how the graph changes as you click among the three buttons to its left. What is the primary message of the full graph (with all three curves shown)?
a. Climate models can successfully reproduce the major recent trends in temperature data by considering natural factors alone.
b. Climate models are unable to account for the major recent trend in temperature data.
c. Climate models successfully reproduce the major recent trend in temperature data only if both human and natural factors are included.
Ans: c. Climate models successfully reproduce the major recent trend in temperature data only if both human and natural factors are included.
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Two cylinders made of the same material roll down a plane inclined at an angle ? with the horizontal. Each travels the same distance. The radius of cylinder B is twice the radius of cylinder A. In what order do they reach the bottom?
A. A reaches the bottom first because it has the greater acceleration. B. A reaches the bottom first because it has a smaller rotatinal inertia. C. B reaches the bottom first because is experiences a larger torque. D. B reaches the bottom first because it travels a larger distance in one rotation. E. They both reach the bottom at the same time, because each has the same linear acceleration.
A 200-g mass attached to the end of a spring causes it to stretch 5.0 cm. If another 200-g mass is added to the spring, the potential energy of the spring will be
A) twice as much. B) times as much. C) the same. D) 4 times as much. E) 3 times as much.
A straight wire carries a current of 40 A in a uniform magnetic field (magnitude = 80 mT). If the force per unit length on this wire is 2.0 N/m, determine the angle between the wire and the magnetic field
a. either 39° or 141° b. either 25° or 155° c. either 70° or 110° d. either 42° or 138° e. either 65° or 115°
A point charge Q is placed on the x axis at x = 2.0 m. A second point charge, -Q, is placed at x = 3.0 m. If Q = 40 mC, what is the magnitude of the electrostatic force on a 30-mC charge placed at the origin?
a. 7.2 N b. 3.9 N c. 1.5 N d. 14 N e. 8.1 N