As measured in Earth's rest frame, a spaceship traveling at takes to travel between planets. How long does the trip take as measured by someone on the spaceship?
A) 2.98 y
B) 7.28 y
C) 42.1 y
D) 30.7 y
Answer: A
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In nickel-silver copper alloys, the major alloy elements are nickel and _________.
Fill in the blank(s) with the appropriate word(s).
A pair of narrow slits that are 1.8 mm apart is illuminated by a monochromatic coherent light source. A fringe pattern is observed on a screen 4.8 m from the slits
If there are 5.0 bright fringes/cm on the screen, what is the wavelength of the monochromatic light? A) 550 nm B) 600 nm C) 650 nm D) 700 nm E) 750 nm
A baseball is released at rest from the top of the Washington Monument. It hits the ground after falling for 5.0 s. What was the height from which the ball was dropped? (g = 9.8 m/s2 and assume air resistance is negligible)
a. 1.5 × 10^2 m c. 1.2 × 10^2 m b. 1.8 × 10^2 m d. 2.1 × 10^2 m
An alpha particle is emitted from a radioactive source with an energy of 5 MeV. How fast is it moving (in m/s)? (m = 4.002 603 u, 1 u = 1.66 × 10^-27 kg.)
a. 2.4 × 10^7 b. 1.6 × 10^7 c. 3.7 × 10^7 d. 4.6 × 10^7 e. 2.1 × 10^7