Which color of light undergoes the smallest refraction when passing from air to glass?
A) red
B) yellow
C) green
D) violet
E) blue.
A
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A 100-m long wire carrying a current of 4.0 A will be accompanied by a magnetic field of what strength at a distance of 0.040 m from the wire? (magnetic permeability in empty space µ0 = 4p × 10^-7 T×m/A)
a. zero c. 2.0 × 10^-5 T b. 1.6 × 10^-5 T d. 4.0 × 10^-5 T
A plane stress element on a bar in uniaxial stress has a tensile stress of ?? 5 78 MPa (see fig.). The maximum shear stress in the bar is approximately:
(A) 29 MPa
(B) 37 MPa
(C) 50 MPa
(D) 59 MPa
For an astronaut working outside a spaceship, the greatest loss of heat would occur by means of
a. conduction. b. convection. c. radiation. d. conduction and convection. e. conduction and radiation.
The amount of force needed to sustain motion of a rock in outer space is
A) a force equal to its weight. B) a force less than its weight if friction is absent. C) none of these