If ? = 40° and the tension in string 2 is 30 N, determine M.
A. 3.4 kg
B. 3.6 kg
C. 2.6 kg
D. 4.9 kg
E. 7.5 kg
Answer: C
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Einstein revolutionized modern physics by ____
a. documenting the existence of gravity through experiments on objects in motion b. proving that Galileo and Newton were fundamentally incorrect about gravity c. explaining how specific gravity impacts the geometry of curved space-time d. providing an explanation of gravity based on the geometry of curved space-time e. defining the difference between violent motion and natural motion
According to Einstein’s theory of special relativity, a stationary observer measures
A. a shorter length of an object than a moving observer measures B. a longer length of an object than a moving observer measures C. the same length of an object than a moving observer measures
An electron moves in a region where the magnetic field is uniform, has a magnitude of 60 ?T, and points in the positive x direction. At t = 0 the electron has a velocity that has an x component of 30 km/s, a y component of 40 km/s, and a z component of zero. What is the pitch of the resulting helical path?
a. 13 mm b. 32 mm c. 24 mm d. 18 mm e. 3.8 mm
Francium-223 decays to radium-223 by emitting what kind of nuclear radiation?
A) Alpha B) Beta minus C) Beta plus D) Gamma E) X-rays.