A solid uniform disk is rolling without slipping along a horizontal surface with a speed of 4.5 m/s when it starts up a ramp that makes an angle of 25° with the horizontal
What is the speed of the disk after it has rolled 3.0 m up as measured along the surface of the ramp?
A) 4.0 m/s
B) 1.9 m/s
C) 2.1 m/s
D) 6.8 m/s
E) 8.0 m/s
B
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The stars found in nebulae like the Orion Nebula probably formed
A) within the last few million years. B) about 10 million years ago. C) hundreds of millions of years ago. D) billions of years ago. E) at the beginning of the universe.
A binary star is a pair of stars that orbit around each other. By detecting this orbital motion, and using Kepler's laws and the law of gravitation, one can directly measure the stars' ________.
A. temperatures B. masses C. luminosities D. distances
Which of the following best describes a sound level of intensity 1 W/m2?
a. extremely loud b. about that of a power mower c. normal conversation d. like a whisper
In analyzing circuits in which resistors are wired partially in series and partially in parallel, which one of the following statements describes the preferred approach to take to determine the equivalent resistance in the circuit?
a) Find the sum of all the resistors. This is the equivalent resistance for the circuit. b) Break the circuit into smaller parts and find an equivalent resistance for each part. Then continue this process until all of the parts are added together correctly either in series or parallel until a single equivalent resistance is found. c) All together all of the resistors in series, ignoring any wired in parallel as they do not significantly add to the equivalent resistance of the circuit. The sum of the resistors in series is the equivalent resistance d) All together all of the resistors in parallel, ignoring any wired in series as they do not significantly add to the equivalent resistance of the circuit. The sum of the resistors in parallel is the equivalent resistance.