A uniform 1.0-N meterstick is suspended horizontally by vertical strings attached at each end. A 2.0-N weight is suspended from the 10-cm position on the stick, another 2.0-N weight is suspended from the 50-cm position, and a 3.0-N weight is suspended from the 60-cm position. What is the tension in the string attached at the 100-cm end of the stick?
a. 1.9 N
c. 3.5 N
b. 3.0 N
d. 4.0 N
C
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Which of the following agrees with a no-center, no-edge Universe?
a. a flat geometry b. a positive-curved geometry c. a negative-curved geometry d. All of the other choices are correct.
Calorimetry: How many grams of ice at -17°C must be added to 741 grams of water that is initially at a temperature of 70°C to produce water at a final temperature of 12°C. Assume that no heat is lost to the surroundings and that the container has negligible mass. The specific heat of liquid water is 4190 J/kg ? C° and of ice is 2000 J/kg ? C°. For water the normal melting point is 0°C and the heat of fusion is 334 × 103 J/kg. The normal boiling point is 100°C and the heat of vaporization is 2.256 × 106 J/kg.
Fill in the blank(s) with the appropriate word(s).
What is at the very center of the Milky Way and what is the best evidence for it?
A: Only young, hot, massive stars- they've been detected in the IR B: A cluster of neutron stars, 3 MS black holes- detected in the IR C: A supermassive black hole- detections of stellar orbits over 8 years D: Old stars, gas, dust, and giant molecular clouds- detected in the optical E: Bok Globules, planetary nebulae, and brown dwarfs- detected with X-rays
An electron is confined in a one-dimensional box (an infinite well). Two adjacent allowed energies of the electron are 1.068 × 10-18 J and 1.352 × 10-18 J. What is the length of the box? (h = 6.626 × 10-34 J ? s, mel = 9.11 × 10-31 kg)
A) 0.93 nm B) 1.1 nm C) 2.3 nm D) 1.9 nm