Work: You carry a 7.0-kg bag of groceries 1.2 m above the ground at constant speed across a 2.7 m room. How much work do you do on the bag in the process?
A. 0.00 J
B. 82 J
C. 185 J
D. 157 J
Answer: A
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Some young star clusters contain large numbers of T Tauri stars
a. True b. False Indicate whether the statement is true or false
Fluid Flow: A pressurized cylindrical tank, 5.0 m in diameter, contains water that emerges from the pipe at point C with a speed of 84 m/s, as shown in the figure. Point A is 10 m above point B and point C is 3.0 m above point B. The area of the pipe at point B is 0.080 m2 and the pipe narrows to an area of 0.070 m2 at point C. Assume that the water is an ideal fluid in laminar flow. The density of water is 1000 kg/m3. The rate at which the water level is falling in the tank is closest to
A. 300 mm/s. B. 340 mm/s. C. 250 mm/s. D. 210 mm/s. E. 160 mm/s.
Suppose Earth's axis had a greater tilt (more than 23.5 degrees). Which of the following statements would not be true?
A) The celestial sphere would be covered by a different set of constellations than it is with the current axis tilt. B) Seasonal temperature variations would be more extreme than they are with the current tilt. C) We would have more daylight in summer and less daylight in winter than we do with the current tilt. D) The Arctic and Antarctic circles would be located closer to the equator than they are now.
The quantum mechanical model of the hydrogen atom requires that if the principal quantum number = 4, there will be how many permitted orbital quantum numbers?
a. 2 b. 4 c. 8 d. 16 e. 32