A barge is 15.0 m wide and 75.0 m long and has vertical sides. The bottom of the hull is 1.20 m below the water surface. What is the weight of the barge and its cargo, if it is floating in fresh water of density 1000 kg/m3?
A) 22.6 MN
B) 13.2 MN
C) 1.35 MN
D) 1.13 MN
E) 11.3 MN
B
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Which of the following statements about the disk of the Milky Way is false?
A) The average age of disk stars is less than that of halo stars. B) Disk stars are all younger than 5 billion years. C) Disk stars have a higher proportion of heavy elements, on average, than halo stars. D) Disk stars orbit in the same direction around the Galactic center. E) The length of the disk is about 100 times its thickness.
A person with a near point of 25 cm uses a magnifying lens having a focal length of 10 cm. What is the angular magnification of this lens if the person's eyes are focused at his near point?
A) 2.5 B) 4.5 C) 3.5 D) 1.5
Explain what happens when the angular speed of the coil in an electric generator is increased
What will be an ideal response?
A satellite of mass M takes time T to orbit a planet. If the satellite had twice as much mass, the time for it to orbit the planet at the same altitude would be
A) 4T. B) 2T. C) T. D) T/2. E) T/4.