A constant force of 15 N in the negative y direction acts on a particle as it moves from the origin to the point 
m. How much work is done by the given force during this displacement?
A. +45 J
B. ?45 J
C. +30 J
D. ?30 J
E. +75 J
Answer: B
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A) sound waves. B) light waves. C) water waves. D) all of the above E) none of the above
Jupiter is slowly shrinking through gravitational contraction today
Indicate whether the statement is true or false
Which of the following is a reason why the Ptolemaic model was the accepted model of the Universe?
A) It was a very good predictor of planet positions. B) The authority of Aristotle was immense. C) It proved that the Sun was at the center of the Universe. D) The multiple revisions to the model made it completely accurate.
An incompressible fluid is flowing through a vertical pipe with a constriction. The wide section is 2.00 cm in diameter and is at the top of the pipe. The pressure of the fluid in the wide section at the top is 200 kPa. The velocity of the fluid in the wide section is 4.00 m/s. The narrow section is located 8.00 m below the wide section. What is the diameter of the narrow section for the pressure of the fluid in the narrow section to equal the pressure in the wide section? (density of the fluid is 680
A. 1.10 cm B. 1.20 cm C. 1.31 cm D. 1.42 cm E. 1.55 cm