A crane lifts a steel submarine (density = 7.8 × 103 kg/m3 ) of mass 20,000 kg. What is the tension in the lifting cable:
(a) when the submarine is submerged?
(b) when it is entirely out of the water?
(a) 1.71 × 105 N
(b) 1.96 × 105 N
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Our own Local Group is dwarfed by the much larger Virgo Cluster, about 50 million light years distant
Indicate whether the statement is true or false
The traditional "top-down" hypothesis states that the galaxy formed
a. from a large spherical cloud of gas that was rotating very slowly. b. from a large cloud of material that broke off a larger galaxy. c. from material that had been ejected in the violent explosion of a dying galaxy. d. as a result of mergers between several smaller groups of gas, dust, and stars. e. as two massive galaxies collided.
George Gamow, the creator of the Big-Bang theory of the origin of the universe, asks you to imagine what would happen if the speed of light was 15. mi/h
If you were on the sidewalk looking at a bicyclist ride down the street, how does she look to you while riding, compared to when she stops? A) taller, the same mass, but stretched out like a limousine B) shorter, the same mass, but stretched out like a limousine C) same height, greater mass, and flatter in the direction she is moving D) same height, smaller mass, and flatter in the direction she is moving E) shorter, greater mass, but stretched out like a limousine
At a location that is 3.00 m from wave source A and 4.20 m from wave source B, destructive interference occurs. Source A and source B are coherent and in phase
What is the maximum wavelength of the waves? A) 0.60 m B) 1.20 m C) 12.6 m D) 1.40 m E) 2.40 m