The planet which shows us the widest range of surface temperatures between day and night is
A) Earth. B) Mercury. C) Mars. D) Venus. E) our Moon.
B
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A 500-N tightrope walker stands at the center of the rope such that each half of the rope makes an angle of 15.0° with the horizontal. What is the tension in the rope?
a. 1440 N c. 480 N b. 970 N d. 2900 N
Population II stars contain about _____ atoms heavier than helium
A) 0.1 percent B) 0.5 percent C) 1.1 percent D) 2.3 percent
Young's Modulus: An aluminum wire 2.0 m long and 2.0 mm in diameter supports a 10.0-kg fixture. What is the stress in the wire? Young's modulus for aluminum is 7.0 × 1010 N/m2.
A. 3.1 × 107 N/m2 B. 6.2 × 107 N/m2 C. 9.3 × 107 N/m2 D. 1.2 × 108 N/m2
A teacher sends her students on a treasure hunt. She gives the following instructions: 1. Walk 300 m north 2. Walk 400 m northwest 3. Walk 700 m east-southeast and the treasure is buried there
As all the other students walk off following the instructions, Jane physics student quickly adds the displacements and walks in a straight line to find the treasure. How far and in what direction does Jane need to walk? A) 187 m in a direction 67.3° north of east B) 481 m in a direction 40.9° north of east C) 399 m in a direction 52.5° north of east D) 284 m in a direction 28.2° west of north E) The treasure position cannot be reached in one straight walk.