An ant crawls in a straight line at a constant speed of 0.24 m/s for a distance of 3.0 m, beginning in the corner of a square classroom. It then turns exactly 90 degrees to the right, and proceeds an additional 4.0 m with a constant speed of 0.44 m/s, reaching the other corner of the same wall from which it began. What was the average speed for the full trip from corner to corner?
A. 0.34 m/s
B. 0.30 m/s
C. 0.21 m/s
D. 0.23 m/s
E. 0.32 m/s
E. 0.32 m/s
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Uniform Circular Motion: A car goes around a circular curve on a horizontal road at constant speed. What is the direction of the friction force on the car due to the road?
A. tangent to the curve in the forward direction B. tangent to the curve opposite to the direction of the car's motion C. perpendicular to the curve outward D. perpendicular to the curve inward E. There is no friction on the car because its speed is constant.
Uncertainty Principle Using Momentum and Position: You measure the velocity of an electron to an accuracy of ±22.6 m/s. What is the minimum uncertainty in its position? (h = 6.626 × 10-34 J ? s, melectron = 9.11 × 10-31 kg)
A. 8.05 ?m B. 4.03 ?m C. 16.1 ?m D. 32.2 ?m E. 5.12 µm
Force on a Wire: When the switch is closed in the circuit shown in the figure, the wire between the poles of the horseshoe magnet deflects upward. From this you can conclude that the left end of the magnet is
A. a north magnetic pole. B. a south magnetic pole. C. There is not enough information given to answer the question.
If the newly discovered planet of Krypton has 100. times the mass of the Earth and 100. times the diameter of the Earth, what would be the period of a "low" orbiting satellite around Krypton?
A) 1.5 hours B) 1.5 × 103 hours C) 15. hours D) 1.5 × 102 hours E) 0.15 hours