Suppose you measure the parallax angle for a particular star to be 0.1 arcsecond. The distance to this star is
A) 10 light-years.
B) 10 parsecs.
C) 0.1 light-year.
D) 0.1 parsec.
E) impossible to determine.
B
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An object attached to one end of a string moves in a circle at constant speed. Which of the following is correct?
A. the object is accelerating as it moves B. the object's velocity is the same as its speed C. the object does not require a force to keep its state of circular motion D. if the string breaks, the object will keep its circular motion E. If the string breaks, the object will move Radially away from the center of the cicl
The uncertainty principle can be used to relate the uncertainties in which two quantities?
A) position and momentum B) the force of gravity and the force of electromagnetism C) spin and charge D) position and spin E) mass and energy
An interstellar gas cloud has the mass to form hundreds of stars. What generally happens to it?
What will be an ideal response?
Which man exerts greater pressure against the floor?
1) a 150-kg man lying on the floor 2) a 150-kg man standing on the floor 3) Both men exert the same pressure. The reason is that 4) both men have the same weight. 5) the upright man's weight is distributed over a smaller area. 6) the man lying down has his weight equally distributed.