Intensity: The intensity of the waves from a point source at a distance d from the source is I. At what distance from the sources is the intensity equal to 2I?

A. d/2
B. d/
C. d/4
D. d/8


Answer: B

Physics & Space Science

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On a frictionless horizontal table, two blocks (A of mass 2.00 kg and B of mass 3.00 kg) are pressed together against an ideal massless spring that stores 75.0 J of elastic potential energy

The blocks are not attached to the spring and are free to move free of it once they are released from rest. The maximum speed achieved by each block is closest to: A) 6.71 m/s (A), 4.47 m/s (B) B) 4.47 m/s (A), 6.71 m/s (B) C) 5.48 m/s for both D) 6.12 m/s (A), 5.00 m/s (B) E) 5.00 m/s (A), 6.12 m/s (B)

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What energy is released (in MeV) during a reaction in which 1.67 × 10-25 kg of material is converted to energy?

A) 5.0 × 10-14 MeV B) 4.1 × 10-7 MeV C) 6.7 × 107 MeV D) 3.1 × 10-4 MeV E) 9.4 × 104 MeV

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One kilogram of chilled water at 32°F (0°C) is placed in a freezer which is kept at 0°F (?18°C). Approximately how much electric energy (in kilocalories) is needed to operate the compressor to cool this water to 0°F if the room temperature is maintained at 75°F (24°C)? (LF,ice = 3.33 × 105 J/kg; cice = 2.09 × 103 J/kg?°C)

A. 13 B. 1.5 C. 15 D. 16 E. 33

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Some of Jupiter's smaller outer moons have retrograde orbits, indicating capture occurred

Indicate whether the statement is true or false

Physics & Space Science