If all the components of a vector are equal to 1, then that vector is a unit vector
A) True
B) False
B
Physics & Space Science
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A copper tube with wall thickness of 8 mm must carry an axial ten-sile force of 175 kN. The allowable tensile stress is 90 MPa. The minimum required outer diameter is approximately:
(A) 60 mm
(B) 72 mm
(C) 85 mm
(D) 93 mm
Physics & Space Science
How many joules of energy are required to accelerate one kilogram of mass from rest to a velocity of 0.886c?
A) 1.8 × 1017 J B) 9.0 × 1016 J C) 3.0 × 103 J D) 8.1 × 1021 E) 3.4 × 10-7
Physics & Space Science
Earth's radius is 6.38 × 106 m, and it completes one revolution every day. What is the magnitude of the centripetal acceleration of a person standing on the equator?
A) 0.00844 m/s2 B) 0.00343 m/s2 C) 0.0337 m/s2 D) 0.343 m/s2 E) 0.000854 m/s2
Physics & Space Science
What is the mass number of alpha particles?
A) 1 B) 2 C) 3 D) 4 E) 6
Physics & Space Science