Which of the following is not a prediction made by the theory of relativity?
A) No material object sent outward from Earth can reach or exceed the speed of light.
B) Observers in different reference frames may disagree about whether two events in two different places occur simultaneously.
C) Observers in different reference frames may disagree about the time and distance between two events.
D) Observers in different reference frames may disagree about the basic laws of nature.
E) E = mc2
D
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Momentum: A 0.14-kg baseball is dropped from rest from a height of 2.0 m above the ground. What is the magnitude of its momentum just before it hits the ground if we neglect air resistance?
A. 0.28 kg ? m/s B. 0.88 kg ? m/s C. 0.44 kg ? m/s D. 0.62 kg ? m/s E. 1.4 kg ? m/s
An aluminum cantilever beam (E 5 72 GPa) with a square cross sec-tion and span length L 5 2.5 m is subjected to uniform load q 5 1.5 kN/m. The allowable bending stress is 55 MPa. The maximum deflection of the beam is approximately:
(A) 10 mm
(B) 20 mm
(C) 30 mm
(D) 40 mm
A gray (Gy) is
A) 3.70 × 1010 decays/s in radium. B) the SI unit of absorbed dose = 1 J/kg = 100 rad. C) a dosage of 2.58 × 10-4 C/kg. D) the SI unit of radioactivity (= 1 decay/s). E) 10-2 J/kg.
A baseball is thrown by the center fielder (from shoulder level) to home plate where it is caught (on the fly at shoulder level) by the catcher. At what point does the magnitude of the vertical component of velocity have its minimum value? (air resistance is negligible)
a. just after leaving the center fielder's hand b. just before arriving at the catcher's mitt c. at the top of the trajectory d. magnitude of vertical component of velocity is constant