Two spheres are made of wood – the first is of a variety of wood whose density is equal to that of water, while the second is of a variety whose density is greater than that of water. These spheres have the same volume – and the first remains wherever it is placed in the water, so it is effectively suspended m in mid-water. The second rests on the bottom, being more dense than water. Compare the buoyant forces on the two spheres.
A. Nothing specifically can be concluded without knowing exactly the densities of the spheres.
B. They are identical
C. The force on the second is zero, and therefore less than that on the first, which is non-zero.
D. The force on the second is non-zero and is less than that on the first.
B. They are identical
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Which of the following statements does not use the term angular size or angular distance correctly?
A) The angular distance between those two houses in the distance is 30 degrees. B) The angular distance between those two bright stars in the sky is about 2 meters. C) The angular size of the Sun is about the same as that of the Moon. D) You can use your outstretched hand against the sky to estimate angular sizes and angular distances.
As an object moves from point A to point B only two forces act on it: one force is nonconservative and does ?30 J of work, the other force is conservative and does +50 J of work. Between A and B,
a. the kinetic energy of object increases, mechanical energy decreases. b. the kinetic energy of object decreases, mechanical energy decreases. c. the kinetic energy of object decreases, mechanical energy increases. d. the kinetic energy of object increases, mechanical energy increases. e. None of the above.
A person stands 35.0 m from a flag pole. With a protractor at eye level, he finds that the angle at the top of the flag pole makes with the horizontal is 25.0 degrees
Approximately how high is the flag pole? (The distance from his feet to his eyes is 1.7 m.) A) 10 m B) 20 m C) 30 m D) 50 m E) 80 m
The Hubble Space Telescope has been repaired
Indicate whether the statement is true or false