If we had sent a radio signal to an advanced civilization in 2006 which is located in the zeta reticuli star system approximately 39 light-years away, when would the signal arrive at its destination?
A) 2006
B) 2051
C) 2039
D) 2045
D
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A nonrelativistic electron is confined to a length of 500 pm on the x-axis. What is the kinetic energy of the electron if its speed is equal to the minimum uncertainty possible in its speed?
(h = 6.626 × 10-34 J ? s, mel = 9.11 × 10-31 kg, 1 eV = 1.60 × 10-19 J) A) 0.015 eV B) 0.15 eV C) 1.5 eV D) 15 eV E) 150 eV
A straight wire of length 70 cm carries a current of 50 A and makes an angle of 60° with a uniform magnetic field. If the force on the wire is 1.0 N what is the magnitude of B?
A. 41 mT B. 33 mT C. 55 mT D. 87 mT E. 57 mT
When the ______________ is crossed traveling westward, the date is advanced to the next day
Fill in the blank(s) with correct word
Captain Ray, on the Galactic Explorer, sets off bright signal lights at the two ends of his spaceship so that they are seen as flashing simultaneously by General Kay, who is watch the ship go by. General Kay concludes that she was next to the midpoint of the ship at the instant when the lights flashed in her reference frame. This can only happen if Captain Ray, at the center of the Galactic
Explorer, a. sees the lights flash simultaneously in his coordinate system. b. sees the bow (front) light flash before the aft (rear) light. c. sees the aft (rear) light flash before the bow(front light. d. can calculate that the light flashes reach General Kay so that the flash from the bow light reaches her before the flash from the aft light. e. can calculate that the light flashes reach General Kay so that the flash from the aft light reaches her before the flash from the bow light.