The period of a pendulum is 2.0 s in a stationary inertial frame of reference. What is its period when measured by an observer moving at a speed of 0.60 c with respect to the inertial frame of reference?
2.5 s
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The star Vega has an apparent visual magnitude of 0.03 and the star HR 4374 has an apparent visual magnitude of 4.87 . It has been determined that both stars are at the same distance from Earth. What does this information tell us about the two stars?
a. Vega must be closer to Earth than HR 4374. b. Vega must be farther from Earth than HR 4374. c. Vega must produce less energy per second than HR 4374. d. Vega must produce more energy per second than HR 4374. e. Vega will appear fainter to us than HR 4374.
Wave Characteristics: A cordless phone operates at 900 MHz. What is the wavelength of the electromagnetic wave used by this phone? (c = 3.0 × 108 m/s)
Fill in the blank(s) with the appropriate word(s).
A vector in the xy-plane has an x component of -7.50 units. What must be the y component of this vector so that its magnitude is 10.0 units. (Note: There are two possible answers.)
What will be an ideal response?
Two tiny particles having charges of +5.00 ?C and +7.00 ?C are placed along the x-axis. The +5.00-µC particle is at x = 0.00 cm,
and the other particle is at x = 100.00 cm. Where on the x-axis must a third charged particle be placed so that it does not experience any net electrostatic force due to the other two particles? A) 4.58 cm B) 45.8 cm C) 50 cm D) 91.2 cm E) 9.12 cm