According to modern science, what was the approximate chemical composition of the solar nebula?
A) 50% hydrogen and helium, 50% everything else
B) 98% hydrogen and helium, 2% everything else
C) 98% hydrogen, 2% helium
D) roughly equal proportions of hydrogen, helium, water, and methane
B
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The velocity of a boat with respect to the water is 4.0 m/s at an angle of 30.0 degrees NORTH of EAST. The velocity of the water with respect to the ground is 3.0 m/s at an angle of 90.0 degrees NORTH of EAST. What is the velocity of the boat with respect to the ground?
A. 6.1 m/s at 36 degrees NORTH of EAST B. 5.8 m/s at 55 degrees NORTH of EAST C. 6.1 m/s at 61 degrees NORTH of EAST D. 5.8 m/s at 36 degrees NORTH of EAST E. 6.1 m/s at 55 degrees NORTH of EAST
Another name for the POLARIZING ANGLE is the
A) Moles angle. B) refracted angle. C) Brewster angle. D) Land angle.
A 1.0-kg chunk of ice at 0°C melts, absorbing 80 000 cal of heat in the process. Which of the following best describes what happens to this system?
a. increased entropy b. lost entropy c. entropy maintained constant d. work converted to energy
Several forces act on an object at rest. It is known that the sum of the forces acting on the object is zero. Which statement is necessarily true?
A) The object will remain stationary. B) The object's center of mass may move in such a way that the object will roll without slipping. C) The object's center of mass will not move, but the object may begin to rotate. D) The object's center of mass may accelerate and the object may begin to rotate. E) The object's center of mass may accelerate, but the object will remain in the same orientation.