No one knew that the Earth was round (spherical) until the 1500s, when explorers such as Magellan sailed around the world
Indicate whether the statement is true or false
FALSE
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A violin with string length 32 cm and string density 1.5 g/cm resonates with the first overtone from a 2.0-m long organ pipe with one end closed and the other end open. What is the tension in the string?
A) 1000 N B) 110 N C) 450 N D) 4100 N E) 56 N
A laser can be used for very accurate measurements of distances between objects
a. True b. False Indicate whether the statement is true or false
None of the pulsars emit pulses of visible light because
a. pulsars are too hot to emit visible light. b. pulsars contain black holes that won't let visible light escape. c. the gravitational field of a pulsar is so great that the visible light emitted is redshifted. d. pulsars are too far away for the visible light to be bright enough to be detected at Earth. e. A few pulsars do emit visible light pulses.
Two identical silver spheres of mass m and radius r are placed a distance R (sphere 1) and 2R (sphere 2) from the Sun, respectively. The ratio of the pressure of solar radiation on sphere 2 to that on sphere 1 is
A. 0.25. B. 0.50. C. 1.0. D. 2.0. E. 4.0.