A 30-year-old astronaut goes off on a long-term mission in a spacecraft that travels at speeds close to that of light. The mission lasts exactly 20 years as measured on Earth
Biologically speaking, at the end of the mission, the astronaut's age would be A) more than 50 years.
B) exactly 50 years.
C) less than 50 years.
D) exactly 30 years.
E) exactly 25 years.
C
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The large space telescope that has been placed into an Earth orbit has an aperture diameter of 2.40 meters. What angular resolution will this telescope achieve for visible light of wavelength ? = 4.80 × 10?7 m?
A. 2.44 × 10?7 rads B. 2.44 × 10?4 rads C. 2.44 × 10?3 rads D. 1.22 × 10?6 rads E. 2.00 × 10?6 rads
A laser emits a pulse of light that lasts 10 ns. The light has a wavelength of 690 nm, and each pulse has an energy of 480 mJ. How many photons are emitted in each pulse?
(c = 3.0 × 108 m/s, h = 6.626 × 10-34 J ? s) A) 1.7 × 1018 B) 2.1 × C) 2.6 × D) 3.1 ×
What creates a total lunar eclipse? a. The Sun passes completely through Earth's umbra. b. The Moon passes completely through Earth's umbra
c. The Moon passes through some of Earth's penumbra. d. The Earth passes completely through the Moon's umbra. e. The Earth passes through some of the Moon's penumbra.
In a given frictionless displacement of a particle, its kinetic energy increases by 25 J while its potential energy decreases by 10 J. Determine the work of the nonconservative forces acting on the particle during this displacement
a. ?15 J b. +35 J c. +15 J d. ?35 J e. +55 J