Both pendulum A and B are 3.0 m long. The period of A is T. Pendulum A is twice as heavy as pendulum B. What is the period of B?
A) 0.71T
B) T
C) 1.4T
D) 2T
E) 3T
B
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Wave Characteristics: A laser beam takes 24 ms to travel from a rocket to the reflective surface of a planet and back to the rocket. How far is the rocket from this planet's surface? (c = 3.0 × 108 m/s)
A. 2400 km B. 1200 km C. 1800 km D. 3600 km E. 4800 km
Scientists refer to Earth as a differentiated planet because ________.
A. the temperature in the core is higher than the temperature on the surface B. iron is more dense than silicate material C. the material in the interior of Earth is arranged by density D. Earth's structure is different from the other planets
The first attempt to map the Galaxy via star counts was done by:
A) Galileo in 1612. B) William Herschel in the late eighteenth century. C) Edward Barnard with long exposure photos about 1900. D) Harlow Shapley with the RR Lyrae variables in 1920. E) Edwin Hubble with the new 100" Mt. Wilson telescope in the 1930s.
Georgia moves an unattached piece of wire back and forth over a magnet. Which best explains what will happen?
A. a current will be induced because the wire moves through a magnetic field. B. a current will not be induced because the wire moves through a magnetic field. C. a current will be induced because the wire is not part of a closed circuit. D. a current will not be induced because the wire is not part of a closed circuit.