Velocity: If, in the figure, you start from the Bakery, travel to the Cafe, and then to the Art Gallery in 2.00 hours, what is your(a) average speed?(b) average velocity?
What will be an ideal response?
(a) 5.25 km/h (b) 1.25 km/h south
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Consider two copper wires. One has twice the length and twice the cross-sectional area of the other. How do the resistances of these two wires compare?
A) Both wires have the same resistance. B) The longer wire has four times the resistance of the shorter wire. C) The longer wire has twice the resistance of the shorter wire. D) The longer wire has eight times the resistance of the shorter wire. E) none of the given answers
Which of the following statements correctly compares the terrestrial planets?
A. Earth is the only planet that has active plate tectonics and surface water. B. Venus has the densest atmosphere and the highest average temperature. C. Mercury is the planet with the thinnest atmosphere and the smallest size. D. All of these choices are correct.
A current element (length = 1.0 cm) lies along the x axis with its center at x = 0 and carries a 20-A current in the positive x direction. Consider only the field of this current element and decide which combination of the following statements is correct. 1 . The field at (0, 0, 1.0 m) is in the positive z direction. 2 . The field at (0, 1.0 m, 0) is in the negative y direction. 3 . The field at
(1.0 m, 0, 0) is zero. 4 . The field at (0, 0, 1.0 m) is in the negative y direction. a. 3 and 4 b. 1 and 3 c. 2 and 4 d. 1 and 2 e. None of these
A 400-kg box is lifted vertically upward with constant velocity by means of two cables pulling at 40.0° on either side of the vertical direction. What is the tension in each cable?
A) 231 N B) 400 N C) 800 N D) 2560 N E) 3920 N