A clown 2 m tall looks at himself in a full-length mirror (floor-to-ceiling). Where in the mirror must he look to see his feet?
a. 1 m from the floor
b. 50 cm from the floor
c. 25 cm from the floor
d. at the bottom of the mirror
e. 1.5 m from the floor
a
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Conduction: The thermal conductivity of aluminum is twice that of brass. Two rods (one aluminum and the other brass) of the same length and cross-sectional area are joined together end to end. The free end of the brass rod is maintained at 0°C and the free end of the aluminum rod is maintained at 200°C. If no heat escapes from the sides of the rods, what is the temperature at the place where the two rods are joined together?
A. 76°C B. 133°C C. 148°C D. 155°C
Two stars with about the same mass are found to have transiting planets with similar semi-major axes. Star 1 exhibits a Doppler shift twice as large as Star 2. What can we determine about these two systems?
A) The planet around Star 2 is more massive than the planet around Star 1. B) The planet around Star 1 has a thicker atmosphere than the planet around Star 2. C) The planet around Star 1 is more massive than the planet around Star 2. D) The planet around Star 2 has a thicker atmosphere than the planet around Star 1.
You observe a 1-cm-long crack in the middle of the glass windshield of your car. Compare the expected fracture strength of your defective glass windshield to that of a new one that has a tensile fracture strength of 69 MPa. Assume that the KIc of glass is 0.84 MPa?m1/2.
What will be an ideal response?
In an RLC circuit, the resistance is 10. ohms, the capacitive reactance is 30. ohms, and the inductive reactance is 50. ohms. What is the circuit impedance?
A) 10. ? B) 22. ? C) 90. ? D) 63. ? E) 81. ?