One joule per coulomb is a unit of
A) energy.
B) power.
C) voltage.
D) current.
E) resistance.
Answer: C
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Two harmonic waves traveling in opposite directions interfere to produce a standing wave described by y = 2sin(4x)cos(3t), where x is in m and t is in s. What is the speed (in m/s) of the interfering waves?
A. 0.75 B. 0.25 C. 1.3 D. 12 E. 3.0
The star named Sheat is of M2 II spectral type and luminosity class. Based on this information, which of the following are true? I. Sheat has a surface temperature less than the Sun. II. Sheat has a diameter that is greater than that of the Sun. III. Sheat is more luminous than the Sun. IV. Sheat is located near the upper left-hand corner in the H-R diagram
a. I & II b. II & IV c. II, III, & IV d. I, II, & III e. I, II, III, & IV
The atomic bomb that was dropped on Nagasaki in 1945 killed 140,000 people, helping to end World War II on the next day. It released energy equivalent to that of 20,000 tons of TNT explosive
How much mass was converted to energy when this took place? (1000 tons of TNT = 4.3 × 1012 J) Incidentally, modern H-bombs have energy yields 1000 times as much! A) 1 g B) 10 g C) 100 g D) 1 kg E) 10 kg
A rocket of length 80 m sits on a launch pad. The center of mass of the rocket is located 32 m above the ground. The rocket is launched to an altitude of 100 km. Where is the location of the center of mass of the total rocket-fuel system at the altitude of 100 km?
A. at ground level B. 32 m above ground level C. 40 m above ground level D. 80 m above ground level E. 50 km above ground level